U.S. patent application number 15/701907 was filed with the patent office on 2018-03-15 for coolant supply device and grinding tool having a coolant supply device for a machine tool.
This patent application is currently assigned to DECKEL MAHO PFRONTEN GMBH. The applicant listed for this patent is DECKEL MAHO PFRONTEN GMBH. Invention is credited to Robert JUNG, Florian LAU.
Application Number | 20180071892 15/701907 |
Document ID | / |
Family ID | 59858579 |
Filed Date | 2018-03-15 |
United States Patent
Application |
20180071892 |
Kind Code |
A1 |
JUNG; Robert ; et
al. |
March 15, 2018 |
COOLANT SUPPLY DEVICE AND GRINDING TOOL HAVING A COOLANT SUPPLY
DEVICE FOR A MACHINE TOOL
Abstract
A grinding tool with a coolant supply device for a machine tool
and such a coolant supply device. The coolant supply device for the
grinding tool has a main body with engagement portions or holes and
a line unit for redirecting coolant to a predeterminable processing
area of the grinding tool. Using a clamping device, it is possible
to releasably secure the coolant supply device to the shaft of the
grinding tool. As a result of the attachment of the coolant supply
device on the grinding tool, it is possible to tap the coolant of
the machine tool via an additional valve device on the connector
ring of the machine tool from the standard cooling circuit and
supply it to the grinding location in a predeterminable processing
area of the grinding tool.
Inventors: |
JUNG; Robert; (Pfronten,
DE) ; LAU; Florian; (Pfronten, DE) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
DECKEL MAHO PFRONTEN GMBH |
Pfronten |
|
DE |
|
|
Assignee: |
DECKEL MAHO PFRONTEN GMBH
Pfronten
DE
|
Family ID: |
59858579 |
Appl. No.: |
15/701907 |
Filed: |
September 12, 2017 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B23Q 11/1076 20130101;
B23Q 3/157 20130101; B24B 55/02 20130101; B23Q 2220/008
20130101 |
International
Class: |
B24B 55/02 20060101
B24B055/02 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 12, 2016 |
DE |
102016217344.8 |
Claims
1. A coolant supply device for a grinding tool for use on a machine
tool with tool-carrying work spindle, comprising a main body, which
includes at least one engagement portion, a line unit, which is
arranged on the main body and has at least one discharge opening
for discharging coolant to a predeterminable processing region on
the grinding tool, and a clamping device for releasably attaching
the coolant supply device onto the grinding tool, wherein the
coolant supply device can be secured to a connector ring of the
work spindle of the machine tool via the engagement portion when
the grinding tool is received on the work spindle of the machine
tool.
2. The coolant supply device according to claim 1, wherein the line
unit has a coolant inlet which can dock by means of a docking
device arranged on the connector ring of the work spindle of the
machine tool for supplying coolant when the coolant supply device
is secured to the connector ring of the work spindle of the machine
tool via the engagement portion.
3. The coolant supply device according to claim 1, wherein the
clamping device is configured to secure the coolant supply device
to the grinding tool before the coolant supply device is secured to
the connector ring of the work spindle of the machine tool via the
engagement portion.
4. The coolant supply device according to claim 3, wherein the
clamping device is configured to release the coolant supply device
from being secured to the grinding tool when the coolant supply
device is secured to the connector ring of the work spindle of the
machine tool via the engagement portion.
5. The coolant supply device according to claim 4, wherein in the
state in which the coolant supply device is secured to the
connector ring of the work spindle of the machine tool via the
engagement portion and the line unit for supplying coolant is
docked to the connector ring of the work spindle of the machine
tool, a gap is adjusted between the coolant supply device and the
grinding tool in such a way that the grinding tool rotationally
driven by the work spindle is rotated without contact to the
coolant supply device stationarily secured to the connector ring of
the work spindle of the machine tool.
6. The coolant supply device according to claim 1, wherein the
clamping device comprises a slide and a docking element and
wherein, in a first position, the slide engages in a first groove
of a tool connection of the grinding tool in such a way that a
rotary motion of the grinding tool about the shaft of the grinding
tool is blocked and, in order to release the coolant supply device,
the slide leaves the first groove in a second position so as to
render possible a movement of the grinding tool about the shaft
relative to the coolant supply device.
7. The coolant supply device according to claim 6, wherein the
docking element is a tappet and the clamping device comprises a
spring, which is in operative connection to the slide and the
tappet.
8. The coolant supply device according to claim 1, wherein the main
body has at least two engagement portions and the engagement
portions are designed in such a way that the coolant supply device
is stationarily securable to the connector ring of the work spindle
of the machine tool via clamping elements in the engagement
portions.
9. The coolant supply device according to claim 1, wherein the main
body has a central through hole for receiving the grinding tool at
the coolant supply device.
10. The coolant supply device according to claim 1, wherein the
coolant supply device has a coupling device for coupling the
coolant supply device to a coolant circuit of the machine tool, the
coupling device being a mechanically controllable, electrically
controllable, hydraulically controllable and/or pneumatically
controllable coupling device.
11. The coolant supply device according to claim 10, wherein the
line unit has a coolant inlet, which can dock by means of a docking
device arranged on the connector ring of the work spindle of the
machine tool for supplying coolant when the coolant supply device
is secured to the connector ring of the work spindle of the machine
tool via the engagement portion; and the coupling device is
configured to couple by means of the docking device to the
connector ring of the work spindle of the machine tool, such that
via the coupling of the coupling device to the docking device
coolant from the coolant circuit of the connector ring of the work
spindle can be supplied to the coolant inlet of the line unit.
12. The coolant supply device according to claim 10, wherein the
coupling device comprises a docking cylinder, which surrounds at
least part of the cooling inlet.
13. The grinding tool for use on a machine tool with tool-carrying
work spindle, comprising a shaft, a grinding body provided on the
shaft and a coolant supply device arranged on the shaft according
to claim 1.
14. The grinding tool according to claim 13, wherein the shaft has
a tool connection for connecting the grinding tool to the work
spindle of the machine tool and wherein the coolant supply device
can be secured to the tool connection of the grinding tool.
15. The grinding tool according to claim 12, wherein the coolant
supply device is floatingly mounted on the grinding tool.
16. The grinding tool according to claim 15, wherein a contour part
is provided on the coolant supply device for the floating support
of the coolant supply device, said contour part engaging in a
second groove of the shaft of the grinding tool for supporting the
grinding tool in an axial direction, and engaging in the first
groove for supporting the slides in a radial direction.
17. The grinding tool according to claim 12, wherein the clamping
device secures in a securing position the coolant supply device to
the shaft of the grinding tool in a radial direction and allows a
rotation of the shaft about a longitudinal axis relative to the
coolant supply device in a release position.
18. The grinding tool according to claim 17, wherein the docking
element is actuated for switching between the release position and
the securing position.
19. The grinding tool according to claim 12, wherein the slide of
the coolant supply device is guided in the first groove, and
wherein in the securing position the slide engages in the first
groove of the grinding tool and in the release position the slide
leaves the first groove so as to render possible a radial relative
movement of the grinding tool to the coolant supply device.
20. The grinding tool according to claim 12, wherein the discharge
opening of the line unit is arranged in the region of the grinding
body in such a way that a cooling lubricant can be supplied from
the discharge opening into a work area of the grinding tool for the
purpose of lubrication and/or cooling, wherein the alignment and/or
orientation of the discharge opening of the line unit is
mechanically, electrically, pneumatically and/or hydraulically
adjustable and/or the line unit is releasably mounted.
21. The grinding tool according to claim 12, wherein the docking
element is movable along the movement axis which is parallel to the
longitudinal axis of the shaft.
22. The machine tool having a tool-carrying work spindle, which has
a tool support and a connector ring, which is arranged in the
region of the tool support, wherein the connector ring has at least
one inner line system for coolant and a clamping device for
clamping at least one engagement portion of a coolant supply device
according to claim 1, and wherein a switching member is provided on
the connector ring for switching the coolant flow from the inner
line system of the connector ring to a docking device for coupling
to the coolant supply device.
23. The machine tool according to claim 22, wherein the machine
tool comprises a tool changer and a tool magazine, and the tool
changer is configured to exchange a tool which is clamped on the
work spindle with a tool from the tool magazine, wherein a grinding
tool for use on a machine tool with tool-carrying work spindle,
comprising a shaft, a grinding body provided on the shaft and a
coolant supply device arranged on the shaft, can be received
together with the coolant supply device in the tool magazine and
can be inserted at the work spindle by the tool changer.
24. The machine tool according to claim 22, wherein while clamping
the grinding tool on the work spindle the coolant flow is switched
from the inner line system of the connector ring to the coolant
supply device by contacting the coupling device of the coolant
supply device with the switching member of the docking device of
the connector ring.
25. The machine tool according to claim 22, wherein the coolant
supply device with the grinding tool is switched to the securing
position when arranged in the tool magazine and is switched to the
release position when arranged at the work spindle.
26. The machine tool according to claim 22, wherein for docking the
coolant supply device to the machine tool, the clamping device of
the connector ring engages in the at least one engagement portion
and the coolant supply device is pulled axially towards the
connector ring and the grinding tool is received on the support of
the work spindle of the machine tool, wherein a gap is adjusted
between the coolant supply device and the grinding tool by the
docking of the coolant supply device and the receiving of the
grinding tool.
27. The machine tool according to claim 22, wherein during docking
the docking element is actuated.
28. The machine tool according to claim 22, wherein the switching
member has an inner cylinder and a switching sleeve guided on the
inner cylinder, wherein for switching the coolant flow from the
inner line system to the coolant supply device, the switching
sleeve is moved relative to the switching cylinder by a docking
cylinder of the coupling device to release switching holes of the
inner cylinder and to redirect the coolant flow.
Description
[0001] The present invention relates to an exchangeable coolant
supply device and a grinding tool having such a coolant supply
device for a machine tool with a tool-carrying work spindle, in
particular a milling machine.
BACKGROUND
[0002] When workpieces are ground, it is necessary to provide the
grinding location with sufficient coolant. Grinding machines (i.e.
machine tools set up in particular for grinding) are equipped with
complex pipe constructions, through which the coolant can be
supplied to the desired location. Using methods known to date, this
is conducted on special machines, so called grinding machines.
[0003] Attempts have recently been made to conduct grinding
operations on universal machine tools, milling machines/lathes,
machining centers and/or milling machines, where apart from
conventional milling/drilling tools, grinding tools can also be
introduced and accommodated at tool-carrying work spindles of the
universal machine tools, milling machines/lathes, machining centers
and/or milling machines.
[0004] However, when grinding with grinding tools on universal
machine tools, milling machines/lathes, machining centers and/or
milling machines, it is usually not possible to direct the standard
coolant supply to a grinding location since it has to be
unchangedly available e.g. to conventional milling operations.
[0005] To the present, there are no satisfactory solutions to
supply cooling lubricant to grinding tools when a machine tool,
such as a universal machine tool, a milling machine/lathe, a
processing center and/or a milling machine, is used.
[0006] An object of the present invention is to provide a coolant
supply device and a grinding tool with a coolant supply device for
a machine tool (in particular with a tool-carrying work spindle),
which has a simple design and renders possible improved cooling. In
particular, the supply of the coolant from the coolant system of
the machine tool to the processing area of the grinding tool shall
be improved.
[0007] A further object of the invention is to provide a coolant
supply device and a grinding tool having a coolant supply device
for a machine tool (in particular with tool-carrying work spindle)
by means of which it is possible in a flexible and accurate way to
use the grinding tool e.g. on universal machine tools, milling
machines/lathes, machining centers and/or milling machines with
tool-carrying work spindle, wherein, on the one hand, simple,
efficient and reliable inserting/exchanging operations can be
carried out on the work spindle, in particular by means of
automatic tool change apparatuses on the machine tool, and, on the
other hand, a reliable, well positionable and easily manageable
coolant supply is rendered possible.
SUMMARY OF THE INVENTION
[0008] In order to achieve the above mentioned objects, the
subjects of the independent claims are proposed. The dependent
claims relate to advantageous embodiments of the invention.
[0009] The coolant supply device for a grinding tool of a machine
tool, in particular with a tool-carrying work spindle, such as a
universal machine tool, a milling machine/lathe, of a machining
center and/or a milling machine, is equipped with a main body which
can comprise at least one engagement hole and/or at least one
engagement portion.
[0010] In addition, a line unit which is connected to the main body
can be provided with a coolant inlet and at least one discharge
opening for discharging coolant to a predeterminable processing
region. The coolant supply device can have a clamping means for
releasably securing the coolant supply device to a shaft of the
grinding tool, wherein the coolant supply device can be secured to
the machine tool via the engagement hole and/or the engagement
portion.
[0011] It is thus possible to easily provide a coolant supply for a
grinding tool of a universal machine tool, as a result of which the
cooling lubricant can be conveyed efficiently and in cost-effective
manner to the grinding location in the grinding region.
[0012] In particular, a coolant supply device for a grinding tool
for use on a machine tool with tool-carrying work spindle is
proposed, which has a main body that comprises at least one
engagement portion, a line unit which is arranged on the main body
and has at least one discharge opening for discharging coolant to a
predeterminable processing area at the grinding tool, and a
clamping device for releasably attaching the coolant supply device
to the grinding tool.
[0013] In this connection, the coolant supply device is expediently
securable to a connector ring of the work spindle of the machine
tool via the engagement portion and/or preferably a plurality of
engagement portions, in particular if the grinding tool is
accommodated on the work spindle of the machine tool.
[0014] In preferred embodiments, the line unit has a coolant inlet
which can be docked with a docking device arranged on the connector
ring of the work spindle of the machine tool for supplying coolant,
in particular if the coolant supply device is secured to the
connector ring of the work spindle of the machine tool via the
engagement portion.
[0015] In preferred embodiments, the clamping device is configured
to secure the coolant supply device to the grinding tool before the
coolant supply device is secured to the connector ring of the work
spindle of the machine tool via the engagement portion and/or if
the coolant supply device is not secured to the connector ring of
the work spindle of the machine tool via the engagement
portion.
[0016] In preferred embodiments, the clamping device is configured
to release the coolant supply device from the securement to the
grinding tool if the coolant supply device is secured to the
connector ring of the work spindle of the machine tool via the
engagement portion.
[0017] In preferred embodiments, a gap is adjusted between the
coolant supply device, in particular the clamping device, and the
grinding tool in a state in which the coolant supply device is
secured to the connector ring of the work spindle of the machine
tool via the engagement portion and the line unit for supplying
coolant is docked to the connector ring of the work spindle of the
machine tool, preferably in particular in such a way that the
grinding tool rotationally driven by the work spindle rotates
and/or can rotate without contact with the coolant supply device
secured in stationary fashion to the connector ring of the work
spindle of the machine tool.
[0018] The clamping means and/or the clamping device of the coolant
supply device can comprise a slide and a push means (docking
element), wherein for securing the coolant supply device to the
grinding tool the slide can engage at a first position in a first
groove of the grinding tool, in particular in a first groove of the
tool connection of the grinding tool and for releasing the coolant
supply device, the slide can leave the groove at a second position
so as to render possible a relative movement of the grinding tool
to the coolant supply device.
[0019] Due to this mechanism it is advantageously possible to
attach the coolant supply device to the grinding tool in a simple
and efficient way, wherein the grinding tool can freely rotate by
displacing the slide and, when blocked in the groove by the slide,
the grinding tool can be released/clamped together with the coolant
supply device and/or can be moved to a magazine of the machine
tool.
[0020] The machine tool is preferably a milling machine, and
therefore it is possible to process workpieces not only with
milling processing steps but, by inserting the grinding tool, a
grinding operation is also possible, wherein the workpiece does not
have to be unclamped to be processed in a grinding machine. The
entire processing with milling and grinding processing steps can
thus be done while a workpiece remains clamped on the milling
machine.
[0021] The push means (docking element) of the coolant supply
device can advantageously be a tappet, and the clamping means
(clamping device) can preferably comprise a spring which is in
operative connection to the slide and the tappet.
[0022] The main body of the coolant supply device can have at least
two engagement holes and/or engagement portions, and the engagement
holes and/or engagement portions can be designed in such a way that
the coolant supply device can be secured, and can in particular be
secured in stationary fashion, to the connector ring of the work
spindle (e.g. to a milling head) of the machine tool via clamping
elements in the engagement holes and/or engagement portions. It is
thus easily possible to clamp a combination tool comprising a
grinding tool and a coolant supply device together on the milling
machine.
[0023] The main body of the coolant supply device can
advantageously have a central through-hole for receiving the shaft
and/or the tool connection of the grinding tool on the coolant
supply device.
[0024] The coolant supply device can have a coupling means
(coupling device) for coupling the coolant supply device to a
coolant circuit of the machine tool (in particular preferably a
mechanically controllable, electrically controllable, hydraulically
controllable and/or pneumatically controllable coupling device).
The coupling means (coupling device) thus renders possible the
access to the coolant system of the machine tool.
[0025] The coupling agent and/or the coupling device is preferably
configured to couple by means of the docking device to the
connector ring of the work spindle of the machine tool, in
particular in such a way that via the coupling of the coupling
device the coolant inlet of the line unit can be supplied by means
of the docking device with coolant from the coolant circuit of the
connector ring of the work spindle.
[0026] The coupling means (coupling device) of the coolant supply
device can advantageously comprise a docking cylinder which
surrounds at least part of the coolant inlet.
[0027] A grinding tool for a machine tool, in particular a milling
machine and/or a machine tool with tool-carrying work spindle, can
have a shaft, a grinding body provided on the shaft and a coolant
supply device arranged on the shaft. This combination tool renders
possible to provide a grinding tool with a cooling apparatus,
wherein a common insertion from a tool magazine of the machine tool
is possible.
[0028] The shaft preferably has a workpiece connection to receive
the grinding tool on the work spindle of the machine tool, wherein
in particular the coolant supply device can preferably be secured
to the tool connection of the grinding tool. Such a tool connection
can be made e.g. as a hollow shank taper, steep taper or Morse
taper.
[0029] The coolant supply device of the grinding tool can
advantageously be mounted on the grinding tool in floating
fashion.
[0030] For the floating mounting of the grinding tool of the
coolant supply device, a contour part can be provided on the
coolant supply device. In order to mount the grinding tool, this
contour part can engage in a guide groove of the shaft of the
grinding tool, in particular in a groove of the tool connection,
and, for mounting in a radial direction, the slide can engage in
the first groove.
[0031] As a result, it is advantageously possible to mount the
coolant supply device in floating fashion if e.g. the grinding tool
shall be moved together with the coolant supply device. This is the
case if the grinding tool shall be clamped/unclamped together with
the coolant supply device or if they shall be moved out of/into the
tool magazine.
[0032] Before the processing operation begins, it is possible to
release the mounting by forming a gap, such that the grinding tool
can freely rotate and the coolant supply device remains fixedly or
stationarily connected to the connector ring of the tool spindle
and/or the spindle housing or milling head of the machine tool
without co-rotating.
[0033] In a securing position, the clamping means (clamping device)
of the grinding tool can secure the coolant supply device to the
shaft of the grinding tool in a radial direction and in a release
position can allow a rotation of the shaft about a longitudinal
axis relative to the coolant supply device. In the securing
position, a rotation of the shaft about a longitudinal axis
relative to the coolant supply device is thus blocked and is
released in the release position.
[0034] In order to switch between the release position and the
securing position of the grinding tool, the push means (docking
element) can be actuated.
[0035] The shaft and/or the tool connection of the grinding tool
can advantageously have a (first) groove into which the slide of
the coolant supply device is guided, wherein the securing position
the slide engages in the (first) groove of the grinding tool and in
the release position the slide leaves the groove so as to render
possible a relative movement of the grinding tool to the coolant
supply device.
[0036] The discharge opening of the line unit of the grinding tool
can be arranged in the grinding body region in such a way that a
cooling lubricant can be supplied from the discharge opening to a
work area of the grinding body for lubricating and/or cooling
purposes, wherein the alignment and/or orientation of the discharge
opening of the line unit can be adjusted in particular
mechanically, electrically, pneumatically and/or hydraulically
and/or the line unit is in particular releasably attached.
[0037] The grinding tool can additionally be provided for a milling
head of a machine tool.
[0038] The push means of the grinding tool can advantageously be
movable along a movement axis which is parallel to the longitudinal
axis of the shaft.
[0039] A machine tool can be equipped with a work spindle which has
a tool support and a connector ring which can be arranged in the
area of the tool support.
[0040] The connector ring can have at least one inner line system
for coolant and a clamping means, wherein a switching member can be
provided for switching the coolant flow from the inner line system
of the connector ring to a contactable coolant supply device. As a
result, it is advantageously possible to attach a coolant supply
device to the standard coolant circuit of the machine tool so as to
render possible a switching depending on the processing operation.
When milling on the machine tool, the standard nozzles can be used
for the coolant and during grinding it is possible, when connecting
the coolant supply device, to switch to them in order to be able to
supply the coolant directly to the grinding location.
[0041] In particular, a machine tool is proposed, in particular a
machine tool having a tool-carrying work spindle which has a tool
support and a connector ring, which is arranged in the area of the
tool support, wherein the connector ring has at least one inner
line system for coolant and a clamping device for clamping at least
one engagement portion of a coolant supply device according to at
least one of the above aspects and wherein a switching member can
preferably be provided on the connector ring in order to switch the
coolant flow from the inner line system of the connector ring to a
docking device (of the connector ring) for coupling to the coolant
supply device.
[0042] The machine tool can comprise a tool changer and a tool
magazine, wherein the tool changer can be configured to exchange a
tool which is clamped on the work spindle with a tool from the tool
magazine and wherein a grinding tool can be received together with
the coolant supply device in the magazine and be inserted by the
tool changer. An automated insertion of the grinding tool including
the attached coolant supply device is thus advantageously
possible.
[0043] The combination tool comprising the coolant supply device
and the grinding tool can be switched to the release position by
the switching member when the combination tool is clamped in the
work spindle by contacting the coupling means (coupling device).
This serves to automatically switch from the standard coolant
circuit to the coolant supply device when the combination tool is
clamped/unclamped.
[0044] The coolant supply device of the machine tool can be
switched with the grinding tool to the securing position when it is
arranged in the tool magazine and to the release position when it
is arranged on the work spindle.
[0045] The machine tool can be a milling machine. Thus, it is
advantageously possible to clamp a grinding tool with optimum
cooling in the milling machine and at the same time to ensure
optimized cooling at the grinding location without having to insert
an additional cooling block. A separate grinding machine is
therefore not necessary.
[0046] In order to dock the coolant supply device to the machine
tool, the clamping means (clamping device) of the connector ring
can engage in the engagement holes and/or engagement portions of
the coolant supply device and the coolant supply device can be
pulled axially towards the connector ring, and in addition the
grinding tool can be received at the support of the work spindle of
the machine tool, wherein, as a result of the docking of the
coolant supply device and the receiving of the grinding tool, a gap
between the coolant supply device and the grinding tool can
preferably be secured or adjusted. A free rotation of the grinding
tool is thus possible (e.g. with driven rotation by the rotating
work spindle about the spindle axis), irrespective of the provided
coolant supply device.
[0047] During the docking operation, the tappet (docking element)
of the machine tool can advantageously be actuated.
[0048] The switching member can advantageously have an inner
cylinder and a switching sleeve guided on the inner cylinder,
wherein for switching the coolant flow from the inner line system
to the coolant supply device the switching sleeve is moved relative
to the switching cylinder by a docking cylinder of the coupling
means to release switching bores of the inner cylinder and redirect
the coolant flow.
[0049] Advantageous embodiments and further details of the present
invention as well as further aspects and the advantages thereof as
well as advantages and more specific design possibilities of the
above described aspects and features are described in the following
descriptions and explanations regarding the attached drawings,
which should, however, by no means be considered limiting.
BRIEF DESCRIPTION OF THE DRAWINGS
[0050] FIG. 1 shows, by way of example, a diagram of a conventional
grinding tool on a work spindle of a machine tool;
[0051] FIG. 2 shows, by way of example, a diagram of a grinding
tool with a coolant supply device according to an embodiment;
[0052] FIG. 3 shows, by way of example, a diagram of the grinding
tool having a coolant supply device according to FIG. 1 on a work
spindle of a machine tool according to an embodiment;
[0053] FIG. 4 shows, by way of example, a diagram of the work
spindle of the machine tool according to FIG. 3 without received
grinding tool;
[0054] FIG. 5 shows, by way of example, a sectional view of the
grinding tool with the coolant supply device according to FIG. 1 on
the work spindle of the machine tool according to an
embodiment;
[0055] FIG. 6 shows, by way of example, a detailed view of the gap
between grinding tool and coolant supply device according to FIG. 1
on the work spindle of the machine tool according to an
embodiment;
[0056] FIG. 7 shows, by way of example, a diagram of a grinding
tool with a coolant supply device and a connector ring on a work
spindle of a machine tool;
[0057] FIG. 8 shows a further exemplary view of the connector ring
of the work spindle of the machine tool;
[0058] FIG. 9 shows an exemplary sectional view through the
connector ring of the machine tool;
[0059] FIG. 10a shows, by way of example, an inner cylinder of the
switching member of the connector ring of the machine tool;
[0060] FIG. 10b shows, by way of example, a switching sleeve of the
switching member of the connector ring of the machine tool;
[0061] FIG. 11 shows an exemplary sectional view of the switching
member;
[0062] FIG. 12 shows an exemplary grinding tool with a coolant
supply device mounted thereon;
[0063] FIG. 13 shows a further exemplary diagram of the grinding
tool with the coolant supply device;
[0064] FIG. 14 shows an exemplary detailed view of the clamping
means of the coolant supply device; and
[0065] FIG. 15 shows an exemplary view of the grinding tool with
the coolant supply device in a tool magazine.
DETAILED DESCRIPTION OF THE DRAWINGS AND OF EMBODIMENTS
[0066] Examples and/or embodiments of the present invention are
described in detail below with reference to the enclosed drawings.
The same or similar elements in the drawings can here be designated
by the same reference signs and sometimes also by different
reference signs.
[0067] However, it should be noted that the present invention is by
no means limited or confined to the below described embodiments and
the design features thereof but further comprises modifications of
the embodiments, in particular those which are comprised by
modifications of the features of the described examples and/or by
combination of one or more of the features of the described
examples on the basis of the scope of protection of the independent
claims.
[0068] FIG. 1 shows, as an example, a diagram of a conventional
grinding tool 200 on a work spindle 100 of a machine tool. The work
spindle 100 comprises a connector ring 110 around a tool support
130, in which a tool connection (e.g. a hollow shank taper, steep
taper or Morse taper) of a tool can be clamped, in particular to
drive a rotation of the tool.
[0069] Conventional coolant nozzles 120 of a coolant supply are
arranged on the connector ring 110 and can feed coolant to the tool
received on the work spindle during processing. This is usually
referred to as AKZ or outer coolant supply (to be distinguished in
particular from inner coolant supply, IKZ, which can be docked in
the tool supply 130).
[0070] As an example, FIG. 1 shows a grinding tool 200 having a
grinding wheel 210 on a shaft 220, which is received and/or clamped
on the tool support 130 of the work spindle 100 by means of the
tool connection 221 (e.g. made as HSK or hollow shank taper).
[0071] However, it is shown herein that a direct and accurate
coolant supply by means of the nozzles 120 is not possible with
adequate accuracy and in targeted fashion to the grinding wheel.
This is improved and rendered possible with greater accuracy by
means of a coolant supply device of the invention and in particular
the following embodiments.
[0072] FIG. 2 shows, by way of example, a diagram of a grinding
tool A3 with a coolant supply device A2 according to an embodiment.
The coolant supply device A2 and the grinding tool A3 form e.g. a
combination tool of an embodiment.
[0073] Analogous to FIG. 1, the grinding tool A3 has e.g. a
grinding wheel A3b (grinding body) which is arranged on a shaft
having a tool connection A3c with a gripper flute A3d (groove). The
tool connection A3c is again made e.g. as a hollow shank taper
(HSK). However, tool connections can also be made differently, e.g.
as steep tapers or Morse tapers.
[0074] In addition, the coolant supply device A2 can be attached
e.g. to the tool connection. However, it is also possible to attach
the coolant supply device A2 on the shaft above the tool
connection.
[0075] The coolant supply device A2 has e.g. a main body A2b, which
has e.g. two protruding portions with respective engagement
portions A2a (e.g. holes). The coolant supply device A2 also has
e.g. a clamping device A2c for fixation to the tool connection A3c
of the grinding tool A3.
[0076] When not clamped to the work spindle, the clamping device
A2c preferably secures the grinding tool A3 to the coolant supply
device A2 and/or the coolant supply device A2 to the grinding tool
A3.
[0077] Furthermore, the coolant supply device A2 has e.g. a line
unit A1 with a discharge opening A1a for discharging coolant to the
grinding wheel A3b, wherein the line unit A1 is e.g. attached to a
side of an inlet portion A1c on the main body and/or a portion of
the engagement portions A2a of the coolant supply device A2.
[0078] For example, the line unit A1 is releasably attached (e.g.
by means of a screw connection), in particular preferably for
replacement with other, shorter, longer and/or differently shaped
line units, e.g. for other tool forms (e.g. depending on the shaft
length and/or grinding wheel thickness and/or diameter) or for
maintenance purposes.
[0079] The line unit A1 can also have flexible portions and/or
joints which are manually moldable, bendable, slidable, adjustable
in length or manually adjustable in any other way, e.g. for
manually adjusting the position and/or alignment of the discharge
opening A1a. In further embodiments, the line unit A1 can
additionally or alternatively have adjustment devices which render
possible an electric, hydraulic, pneumatic or other adjustment of
the position and/or alignment of the discharge opening A1a.
[0080] Additionally or alternatively it is possible for a nozzle
adjustment of the discharge opening A1a being manually,
electrically, pneumatically and/or hydraulically adjustable.
Furthermore, it is possible to provide, additionally or
alternatively to the line unit A1 for coolant, also other lines
e.g. for sealing air or hydraulic systems.
[0081] FIG. 3 shows, as an example, a diagram of the grinding tool
A3 with the coolant supply device A2 according to FIG. 1 on a work
spindle 100 of a machine tool according to an embodiment.
[0082] As an example, the connector ring B of the work spindle 100
has, in addition to the nozzles B3, additional clamping elements B1
and a docking device B2.
[0083] When the grinding tool A3 is removed from a tool magazine
together with the coolant supply device A2 and is inserted and the
tool connection A3c of the grinding tool A3 is received and clamped
in the tool support 130 of the work spindle 100 (wherein the tool
connection A3c is pulled towards the work spindle 100 so as to be
clamped), the exemplary openings of the engagement portions A2a of
the coolant supply device A2 engage in the clamping elements B1 of
the connector ring B of the work spindle 100 where they are
positioned and centered at the predetermined position.
[0084] This clamps the coolant supply device A2 by means of the
engagement portions A2a at a predetermined position on the
connector ring B of the work spindle 100 in stationary fashion and
secures the coolant supply device A2 to the connector ring B of the
work spindle 100 when the grinding tool A3 is received and clamped
on the tool support 130 of the work spindle 100.
[0085] In addition, a coupling device of the coolant supply device
A2 (described below) is coupled in this clamping state to a docking
element of a docking device B2 that is arranged on the connector
ring B of the work spindle 100, preferably to supply coolant from
the cooling circuit of the outer coolant supply of the work spindle
to the line element A1.
[0086] FIG. 4 shows, by way of example, a diagram of the work
spindle of the machine tool according to FIG. 3 without
accommodated grinding tool. As an example, the connector ring B of
the work spindle 100 is expanded by the clamping device with the
clamping elements B1 and the docking device B2 in contrast to the
conventional design according to FIG. 1.
[0087] The docking device B2 is connected to a coolant supply
circuit of the connector ring B of the work spindle 100 and/or can
preferably be connected by switching a valve.
[0088] FIG. 5 shows, by way of example, a sectional view of the
grinding tool with the coolant supply device according to FIG. 1 on
the work spindle of the machine tool according to an embodiment. It
is here shown that the tool connection A3c is clamped in the tool
support 130 and is pulled towards the work spindle.
[0089] The openings of the engagement portions A2a of the coolant
supply device A2 are in this case arranged e.g. on opposite sides,
and the clamping elements B1 of the clamping device of the
connector ring B of the work spindle 100 engage in these, thus
centering and positioning the coolant supply device A2 at an
accurate predetermined position on the connector ring B of the work
spindle 100 when the grinding tool A3 is received and clamped at
the tool spindle 100.
[0090] However, in order to render possible that in this
stationarily clamped state of the coolant supply device A2 the
grinding tool A3 can rotationally be driven in an unimpeded and
friction-free manner at the work spindle 100, the clamping device
A2c of the coolant supply device A2 is configured in such a way
that in the stationarily clamped state of the coolant supply device
A2 it releases the clamping of the grinding tool A3 and a gap is
adjusted between the grinding tool A3 and the coolant supply device
A2, in particular preferably between the tool connection of the
grinding tool A3 and the clamping device A2c of the coolant supply
device A2.
[0091] FIG. 6 shows, by way of example, a detailed view of the
above mentioned gap between grinding tool and coolant supply device
according to FIG. 1 on the work spindle of the machine tool
according to an embodiment.
[0092] FIG. 7 shows, by way of example, a diagram of a grinding
tool having a coolant supply device and a connector ring on a work
spindle of a machine tool.
[0093] FIG. 7 shows the grinding tool A3 (and/or a grinding tool
holder for receiving a grinding wheel), on which the coolant supply
device A2 (coolant supply device) is arranged.
[0094] The grinding tool A3, which is connected e.g. to the coolant
supply device A2, is referred to, by way of example, as combination
tool A. This combination tool A can be received e.g. in a tool
magazine of a machine tool in designated receptacles or tool
receptacles and can be automatically introduced and/or exchanged
during the insertion via a tool changer of the machine tool (see
FIG. 15).
[0095] The machine tool, which can be in particular a machine tool
having a tool-carrying work spindle (e.g. milling machine,
universal machine tool, milling machine/lathe, machining center),
and which in addition preferably comprises a tool change apparatus,
can automatically remove the combination tool A from the tool
magazine and can position, accommodate and clamp it on the work
spindle of the machine tool and also exchange it again by means of
the tool change apparatus and place it in the tool magazine or a
receptacle of the tool magazine.
[0096] In the present embodiment, the grinding tool A3 is merely
made by way of example with a hollow shank taper as a tool
connection for accommodation in the work spindle. However, the
present invention is not limited to designs with hollow shank taper
as a tool connection but it is also possible to use further tool
connections, in particular e.g. steep tapers or Morse tapers in
addition to the illustrated hollow shank taper.
[0097] Such tool connections usually have portions where the tool
connection, e.g. for the tool change on the work spindle and/or for
accommodation from the tool magazine can be gripped by a gripper
device of the tool change device. In the present embodiment, such a
portion (gripper portion) is merely made by way of example as a
gripper flute on the hollow shank taper as a tool connection.
[0098] In order to connect the combination tool A to the work
spindle of the machine tool, the connector ring B is provided which
has clamping means (clamping portions and/or clamping elements) B1,
to which the engagement portions and/or in particular the
engagement holes of the coolant supply device A2 can be docked.
[0099] In particular, the clamping means B1 of the connector ring B
are made e.g. as a drilling clamping mechanism which, for
positioning and clamping the coolant supply device A2, are inserted
in the engagement holes of the coolant supply device A2 in order to
position and clamp them. The connector ring B of the machine tool
also has e.g. the coolant supply elements B3 (nozzles), which are
the standard coolant supply nozzles of the machine tool.
[0100] The grinding tool A3 is clamped and secured to the work
spindle of the machine tool via the tool connection. The shaft of
the grinding tool A3 preferably has an HSK (hollow shank taper)
support as a tool connection for clamping on the work spindle. As
already mentioned, such an HSK (hollow hank taper) has a tool
connection body having a gripper flute and a support portion for
receiving and clamping on the work spindle.
[0101] As an example, the coolant supply device is arranged on or
attached to the tool connection body on the shaft of the grinding
tool. In this connection, an element engage e.g. in the
circumferential gripper flute of the tool connection body and
secures the coolant supply device A2 axially to the tool connection
body on the shaft of the grinding tool A3.
[0102] In addition, e.g. a spring-loaded slide is provided which
can engage in a lateral groove on the tool connection body to
radially secure the coolant supply device A2.
[0103] In order to clamp the coolant supply device A2 via the
engagement holes (engagement portions) on the connector ring B, it
is positioned, centered and clamped e.g. via the two drilling
clamping mechanisms (clamping elements and/or clamping means
B1).
[0104] When the grinding tool A3 is jointly inserted together with
the coolant supply device A2 by the tool changer, the engagement
holes of the coolant supply device A2 are threaded into the
clamping means B1 (clamping elements and/or drilling clamping
mechanisms).
[0105] When the tool A3 is now clamped on the work spindle, a
predetermined, circumferential gap is adjusted between the grinding
tool (and/or the tool connection body) and the docked coolant
supply device A2 (see FIG. 6).
[0106] As a result of the movement of the tappet (docking element),
the slide of the clamping means A2c is also pressed out of the
first groove A3e. The coolant supply device A2 is thus stationarily
secured to the milling head or the connector ring B, and the
grinding tool A3 with the grinding body (grinding disk) can freely
move on account of the gap.
[0107] In order to also keep this gap free during processing and to
avoid friction by possibly penetrating dirt, further nozzles can be
provided which introduce, inject and/or blow sealing air and/or
coolant or lubricant on or in the gap in order to be able to avoid
a friction-causing penetration of undesired dust and/or chip dirt
into the gap.
[0108] The described connecting process between the combination
tool A and the connector ring B is also referred to as docking. In
this docking, the coolant supply from the standard coolant supply
elements B3 is switched to the introduced coolant supply device A2
by a sliding mechanism which is available as a switching member B2
(docking device). As a result, the entire cooling lubricant volume
flow can be used for grinding, if required.
[0109] When the combination tool A is exchanged, the coolant supply
is again automatically switched to the coolant supply element B3 of
the inner coolant circuit of the connector ring B of the machine
tool.
[0110] By providing the combination tool A, which comprises the
grinding tool A3 and the coolant supply device A2, and by providing
the switching possibility by the switching member B2 on the
connector ring B of the machine tool, it is possible to use a
grinding tool on a milling machine, wherein the standard coolant
supply of the milling machine can be advantageously tapped to
convey the cooling lubricant to the grinding location of the
grinding tool A3.
[0111] Individual coolant supply devices A2 can be provided for
different grinding tools A3 with different grinding bodies, said
coolant supply devices having an adapted line run so as to always
position in optimum fashion the discharge opening for the cooling
lubricant for the respective tool.
[0112] In further embodiments, the alignment or orientation of the
discharge opening can also be adjustable manually, electrically,
pneumatically and/or hydraulically.
[0113] This combination tool A is markedly cheaper than the
insertion of a separate nozzle block for the supply of the cooling
lubricant. In addition, as a result of the use of the combination
tool A, no additional change unit and no additional coolant supply
elements are necessary on the connector ring B of the machine tool
to convey the cooling lubricant to the desired grinding
location.
[0114] FIG. 8 shows a further exemplary view of the connector ring
of the work spindle of the machine tool.
[0115] FIG. 8 illustrates, by way of example, the connector ring B.
This ring is provided on the machine tool in the area of the work
spindle. An inner coolant circuit is provided in the connector ring
B. The cooling lubricant is transported via this coolant circuit to
the respective coolant supply elements B3, which are made in
particular as nozzles.
[0116] When the machine tool is used for milling, the cooling
lubricant is conveyed via these nozzles B3 directly to the
processing areas of the milling cutter. If a grinding tool is
inserted on the milling machine instead of a milling cutter, this
grinding tool typically has an elongated shaft. In particular in
the case of grinding tools having a grinding body which is a
grinding wheel, such an elongated shaft is necessary to be able to
process specific areas of the workpiece.
[0117] In order to achieve a sufficient supply of the cooling
lubricant for the inserted grinding tool, the standard coolant
supply elements B3 are, however, not sufficient. It is e.g.
proposed to tap the inner cooling lubricant circuit (e.g. the AKZ)
via the cooling lubricant switching member B2 and to redirect the
cooling lubricant from the coolant supply elements B3 to convey it
specifically to the grinding location via a coolant supply device
A2.
[0118] In the illustrated embodiment, the cooling lubricant
switching member B2 is provided with an inner cylinder B4 and a
switching sleeve B5. If a hollow cylinder is pressed on this
switching sleeve B5 when the coolant supply device A2 docks to the
connector ring B, this switching sleeve B5 moves inwards and
releases upper switching holes Bob of the inner cylinder B4, such
that the cooling lubricant can be conveyed from the connector ring
B into the coolant supply device A2.
[0119] The clamping means B1 are provided to attach the coolant
supply device A2, said clamping means being in particular e.g.
clamping bolts. These clamping bolts or clamping elements B1 engage
in the engagement holes (engagement portions) of the coolant supply
device A2 and secure them.
[0120] The connector ring B additionally has e.g. the support B6,
which is e.g. a through hole, through which the end cap of the tool
connection A3c of the grinding tool A3 can be connected to the tool
support 130 of the work spindle of the machine tool to apply the
torque of the machine tool to the grinding tool.
[0121] FIG. 9 shows an exemplary sectional view through the
connector ring of the machine tool.
[0122] FIG. 9 illustrates an exemplary section through the clamping
means B1 (clamping element) and the switching member B2 of the
valve device. The switching member B2 comprises e.g. a switching
sleeve B5, which is forced out of the connector ring B via a spring
B8. The movement of the switching sleeve B5 is limited via an inner
cylinder B4, which is screwed into the connector ring B.
[0123] The cooling lubricant is supplied to the coolant supply
elements B3 via the inner cooling lubricant circuit B9 to ensure an
appropriate coolant supply during the milling operation of the
machine tool.
[0124] During the docking operation of the coolant supply device
A2, the switching sleeve B5 is pressed into the connector ring B
against the spring force of the spring B8 for the grinding
operation of the milling machine in order to release the upper
switching hole of the inner cylinder B4 and simultaneously close
the lower switching hole B4a of the inner cylinder Bob.
[0125] This closure serves to block a supply of the coolant to the
inner cooling lubricant circuit B9. The cooling lubricant can here
be supplied via the cooling lubricant circuit B7.
[0126] FIG. 10a shows, by way of example, an inner cylinder of the
switching member of the connector ring of the machine tool and FIG.
10b shows, by way of example, a switching sleeve of the connector
ring of the machine tool.
[0127] FIG. 10a and FIG. 10b show in detail the inner cylinder B4
and the switching sleeve B5. The inner cylinder B4 of the switching
member B2 has a covering surface B4c, which has a larger diameter
than the remaining cylinder body to thus delimit, as an upper stop
for the switching sleeve B5, the axial movement of the switching
sleeve from the connector ring B.
[0128] The inner cylinder B4 is e.g. hollow and, for a redirection
of the cooling lubricant, has an inner space B4f and lower
switching holes B4a and upper switching holes Bob. In the base area
of the inner cylinder B4, e.g. the bottom area B4e is provided
which serves as a connection point to the cooling lubricant circuit
of the machine tool, wherein a phase B4d (e.g. thread recess) is
provided in addition in the base area of the inner cylinder B4.
[0129] The switching sleeve B5 has an inner sliding surface B5b,
along which the switching sleeve B5 glides along the outer surface
of the inner cylinder B4. The inner gliding surface B5b has, on the
front side of the switching sleeve B5, a step which is designed as
a counter member of the cover surface B4c of the inner cylinder B4
in order to confine the axial movement of the switching sleeve B5.
The outer gliding surface B5d of the switching sleeve B5 glides in
the connector ring B5. The switching sleeve B5 also has the supply
holes B5c for switching the cooling lubricant flow.
[0130] Four symmetric holes are preferably provided as supply holes
B5c. The inner cylinder B4 also has preferably in each case four
lower switching holes B4a and four upper switching holes Bob, which
are arranged symmetrically along the circumference in a plane of
the inner cylinder B5.
[0131] FIG. 11 shows an exemplary sectional view of the switching
member. FIG. 11 depicts a sectional view of the inner cylinder B4,
which is introduced into the switching sleeve B5. The step of the
cover surface B4c is here in contact with the inner gliding surface
B5d of the switching sleeve B5.
[0132] The switching sleeve B5 additionally has the contact surface
B5a where the coupling means of the coolant supply device A2
engages to displace the sleeve during the docking operation to the
connector ring B4. As a result, the upper switching hole Bob is
released and the lower switching hole B4A is thus blocked.
[0133] In this connection, the lower switching hole B4a is blocked
by displacing the sleeve into the base area of the inner cylinder,
such that the supply hole B5c is no longer overlapped with the
lower switching hole B4a. In order to secure the switching member
B2, a thread B4g is provided e.g. on the inner cylinder B5.
[0134] FIG. 12 shows an exemplary grinding tool with a coolant
supply device mounted thereon. FIG. 12 shows the combination tool
A, which is composed of the grinding tool A3 and the attached
coolant supply device A2. The coolant supply device A2 comprises a
main body A2b, which has an outlet opening in the center, through
which the shaft A3a of the grinding tool A3 is passed.
[0135] In addition, the main body A2b has radial projections A2d
(radial offset on both sides). The radial projections A2d are
preferably arranged on opposite sides to improve the power
transmission to the connector ring B in the docked state.
[0136] The radial projections A2d (radial offset) have engagement
holes A2a, through which the clamping means B1 of the connector
ring B can be passed through to secure the main body A2b.
[0137] For the floating support of the coolant supply device A2,
the clamping means A2c is provided at the grinding tool A3. The
clamping means A2c is arranged in a circumferential region of the
main body A2b.
[0138] The shaft A3a of the grinding tool A3 has e.g. the guide
groove A3d, which guides a contour part A2h for the floating
support of the coolant supply device A2.
[0139] The clamping means A2c additionally has a mechanism, via
which it is possible to radially secure the grinding tool A3 with
respect to the coolant supply device A2. In order to clamp the
grinding tool A3 into the spindle of the machine tool or the
milling machine, the shaft A3a of the grinding tool A3 has a
grinding tool attachment A3c. This grinding tool attachment A3c can
introduce the rotary motion of the machine tool into the shaft A3a
via a groove.
[0140] However, it should be noted that such a drive groove can be
provided in particular in the case of hollow shank taper tool
connections. Other tool connections can also have other or
different drive portions.
[0141] The grinding body A3b, which is preferably a grinding wheel,
is provided on the front side of the shaft A3a. A processing area
A3c is also provided on the grinding body A3b and is intended for
contacting a workpiece.
[0142] The discharge opening A1a of the coolant supply device A2 is
directed to this processing region A3c. The coolant is conveyed
from a docking cylinder A1d, which can be contacted with the
switching member B2 of the connector ring B and via which the
cooling lubricant is supplied in the line unit A1, via the line
unit A1 and along the longitudinal pipe A1b to the discharge
opening A1a.
[0143] The cooling lubricant is thus conveyed from the cooling
lubricant circuit of the milling machine (machine tool) towards the
discharge opening A1a via the docking cylinder A1d to optimally
provide the grinding location cooling lubricant. The longitudinal
pipe A1b of the line unit A1 is secured via the fixation A1c.
[0144] FIG. 13 shows a further exemplary diagram of the grinding
tool with the coolant supply device.
[0145] FIG. 13 shows the combination tool A. In order to supply the
cooling lubricant to the discharge opening A1a, the cooling
lubricant inlet Ale is provided, which is arranged in the cavity of
the docking cylinder A1d. The docking cylinder A1d has contact
surfaces which serve to press the switching sleeve of the switching
member B2 into the connector ring B to tap the cooling lubricant
from the connector ring B and pass it on to the discharge opening
A1a via the longitudinal pipe A1b.
[0146] The clamping means A2c has a tappet A2e (docking element),
which is pressed into the clamping means A2c when contacting the
combination tool A with the processing unit of the machine tool so
as to release the radial movement of the grinding tool A3 (i.e. the
shaft A3a and the grinding body A3b), such that the grinding tool
A3 can rotate independently of the coolant supply device A2.
[0147] The tappet A2e is pressed into the clamping means A2c when
the combination tool A docks to the connector ring B here via the
contacting element B10. The contacting element B10 preferably has a
tongue which is made as a rigid lever. This rigid lever presses the
tappet A2e into the clamping means A2c, such that the radial
movement of the grinding tool A3 can be released since the slide
A2g can move out of the axial groove A3c. This adjusts the above
described gap (see FIG. 6).
[0148] FIG. 14 shows an exemplary detailed view of the clamping
means of the coolant supply device.
[0149] FIG. 14 shows a sectional view of the clamping means A2c.
For securing or releasing the shaft A3a of the grinding tool A3,
the tappet A2e is pressed into the clamping means A2c against the
spring A2f to thus move the slide A2g fixedly connected to the
tappet A2e out of a first groove A3e (axial groove).
[0150] When the release position is achieved, the tappet A2e
(docking element) has entered the clamping means A2c to such an
extent that the slide A2g has fully left the first groove A3e and a
rotation of the shaft A3a is possible without blocking by the slide
A2g.
[0151] The floating support of the coolant supply device A2 on the
grinding tool A3 is also achieved via the contour part A2h. The
contour part A2h has a projection, which is adapted in a second
groove A3d (radial groove) and is spaced apart therefrom at a small
distance, preferably 0.5 mm.
[0152] The contour part A2h has an opening in which the spring A2f
is arranged and through which the tappet A2e is passed to be
connected to the slide A2g via a screw connection.
[0153] The side wall A2j of the main body A2b is connected to the
contour part A2h. The contour part A2h is preferably screwed to the
side wall A2j of the main body A2d and secured via a cover A2i.
[0154] FIG. 15 shows an exemplary view of the grinding tool A3
having the coolant supply device A2 (combination tool A) in a tool
magazine 300 of the machine tool.
[0155] The tool magazine 300 (shown only as a partial view) is made
e.g. as a wheel magazine, with a wheel 320, where a plurality of
tool receptacles 309, 310 and 311 are arranged. For example, the
grinding tool A3 with coolant supply device A2 is received and held
at the tool receptacle 310 by means of the tool connection.
[0156] For example, the engagement portions of the coolant supply
device A2 are arranged via the adjacent tool receptacles 309 and
311 and can be positioned there also by means of additional
centering elements. These tool receptacles 309 and 311 are
preferably kept free but other tool receptacles of the tool
magazine can be provided conventionally with other tools.
[0157] For example, the grinding tool A3 with the coolant supply
device A2 is held at the tool magazine in such a way that it is
rotated by 180.degree. compared to the clamping situation on the
work spindle so as to be inserted at the work spindle with proper
orientation in the case of a rotation by 180.degree. by means of a
gripper of a tool change apparatus.
[0158] Since the gripper flute of the tool connection can always be
gripped or be free for being gripped by means of a gripper of a
tool change device at both the work spindle and the work spindle,
at least on the side opposite the clamping device A2c, such a
combination tool can be inserted and exchanged advantageously in an
easy and reliable way and in fully automated fashion with tool
change apparatuses known to date.
[0159] Examples and/or embodiments of the present invention and the
advantages thereof have been described above in detail with
reference to the enclosed drawings.
[0160] However, it shall be pointed out again that the present
invention is by no means limited or confined to the above described
embodiments and the design features thereof but comprises further
modifications of the embodiments, in particular those which are
comprised by modifications of the features of the described
examples and/or by combination of one or more of the features of
the described examples on the basis of the scope of protection of
the independent claims.
* * * * *