U.S. patent application number 12/759151 was filed with the patent office on 2010-12-02 for gear cutting machine.
This patent application is currently assigned to LIEBHERR-VERZAHNTECHNIK GMBH. Invention is credited to Alois Mundt.
Application Number | 20100304642 12/759151 |
Document ID | / |
Family ID | 42358519 |
Filed Date | 2010-12-02 |
United States Patent
Application |
20100304642 |
Kind Code |
A1 |
Mundt; Alois |
December 2, 2010 |
Gear Cutting Machine
Abstract
The invention relates to a gear cutting machine for the grinding
of external profiles and/or internal profiles of workpieces having
at least one machining head which can be rotated about an axis and
which has a grinding tool, and having a dressing unit. In
accordance with the invention, the dressing unit is supported in
the region of the pivot axis of the machining head such that it is
pivotable about the common pivot axis together with the machining
head and such that it can be moved along the pivot axis toward the
grinding tool to be dressed.
Inventors: |
Mundt; Alois; (Kempten,
DE) |
Correspondence
Address: |
DILWORTH & BARRESE, LLP
1000 WOODBURY ROAD, SUITE 405
WOODBURY
NY
11797
US
|
Assignee: |
LIEBHERR-VERZAHNTECHNIK
GMBH
Kempten
DE
|
Family ID: |
42358519 |
Appl. No.: |
12/759151 |
Filed: |
April 13, 2010 |
Current U.S.
Class: |
451/5 ; 451/340;
451/443; 451/47 |
Current CPC
Class: |
B23F 23/1225 20130101;
B24B 53/075 20130101; B23F 1/02 20130101; B24B 53/053 20130101 |
Class at
Publication: |
451/5 ; 451/443;
451/340; 451/47 |
International
Class: |
B24B 51/00 20060101
B24B051/00; B24B 53/00 20060101 B24B053/00; B24B 41/02 20060101
B24B041/02; B24B 1/00 20060101 B24B001/00 |
Foreign Application Data
Date |
Code |
Application Number |
May 29, 2009 |
DE |
102009023275.3 |
Claims
1. A gear cutting machine (1) for the grinding of external profiles
and/or internal profiles of workpieces having at least one
machining head (2, 7) which is rotatable about an axis (A) and
which has a grinding tool (6, 8), and having a dressing unit (3),
wherein the dressing unit (3) is supported in the region of the
pivot axis (A) of the machining head (2, 7) such that it is
pivotable about the common pivot axis (A) together with the
machining head (2, 7); and in that it can be moved along the pivot
axis (A) toward the grinding tool (6, 8) to be dressed.
2. A gear cutting machine (1) in accordance with claim 1, wherein a
swivel bearing is arranged in the machine stand (12) for the
pivoting of the machining head (2, 7) with the grinding tool (6,
8); and the dressing unit is movable in the region of the center of
rotation of this swivel bearing via an axial carriage along the
pivot axis (A).
3. A gear cutting machine (1) in accordance with claim 2, wherein
the swivel bearing is arranged at the end of the machining head (2,
7) at the grinding disc side; and in that the dressing unit (3) is
likewise arranged at the end of the machining head (2, 7) at the
grinding disc side, whereby the dressing unit (3) and the grinding
tool (6, 8) are pivotable about a common axis of rotation (A).
4. A gear cutting machine (1) in accordance with claim 1, wherein
the dressing unit (3) has at least one dressing wheel (4) which is
movable in a direction (V2) along the axis of rotation (B) of the
grinding tool (6, 8).
5. A gear cutting machine (1) in accordance with claim 1, wherein
the grinding tool (6, 8) is movable along its axis of rotation
(B).
6. A gear cutting machine (1) in accordance with claim 4, wherein
the at least one dressing wheel (4) can be moved in the direction
(V2) of the axis of rotation (B) of the grinding tool (6, 8) from
the right and/or the left toward the surface of the grinding tool
(6, 8).
7. A gear cutting machine (1) In accordance with claim 1, wherein a
controller is provided which permits an automatic control of the
grinding process of external profiles and internal profiles as well
as the dressing of the respective grinding tool (6, 8) used.
8. A gear cutting machine (1) in accordance with claim 7, wherein
the controller has corresponding software with only one program or
program part for the dressing of a grinding tool (6, 8) for the
grinding of an external profile or of an internal profile.
9. A method in accordance with claim 1, having the following steps
for the dressing of a grinding tool (6, 8); Moving the dressing
unit (3) in a linear direction (X2) along the pivot axis (A) toward
the grinding tool (6, 8); Moving the at least one dressing wheel
(4) in the direction (V2) along the axis of rotation (B) of the
grinding tool (6, 8); and Engaging the at least one dressing wheel
(4) in each case from the right or the left at the surface of the
grinding tool (6, 8), wherein the movements in accordance with the
steps a and b are controlled along the flank line of the grinding
tool (6, 8) during the dressing.
10. A method in accordance with claim 9, wherein the grinding tool
(6, 8) is additionally moved along the axis of rotation (B) in the
direction of at least one dressing wheel (4).
11. A method in accordance with claim 9, wherein the dressing
process is controlled by an NC controller.
12. A method in accordance with claim 9, wherein the grinding tool
(6, 8) is dressed continuously by the dressing unit (3) during the
grinding process of the external profile of a workpiece.
13. A method in accordance with claim 9, wherein the dressing
process for the dressing of the grinding tool (6, 8) by the
dressing unit (3) is carried out before or after a grinding
process.
14. A method in accordance with claim 9, wherein the grinding tool
(8) is moved upwardly or downwardly out of the toothed arrangement
for the further cycling into the next gap during the grinding of
the internal profile and the dressing process is controlled such
that the grinding tool is always dressed in the upper part position
by the dressing unit (3).
15. A method in accordance with claim 9, wherein the grinding tool
(8) is dressed continuously by the dressing unit (3) during the
grinding process of an internal profile.
16. A gear cutting machine (1) in accordance with claim 5, wherein
the at least one dressing wheel (4) can be moved in the direction
(V2) of the axis of rotation (B) of the grinding tool (6, 8) from
the right and/or the left toward the surface of the grinding tool
(6, 8).
17. A method in accordance with claim 10, wherein the dressing
process is controlled by an NC controller.
18. A gear cutting machine (1) in accordance with claim 2, wherein
the dressing unit (3) has at least one dressing wheel (4) which is
movable in a direction (V2) along the axis of rotation (B) of the
grinding tool (6, 8).
19. A gear cutting machine (1) in accordance with claim 3, wherein
the dressing unit (3) has at least one dressing wheel (4) which is
movable in a direction (V2) along the axis of rotation (B) of the
grinding tool (6, 8).
20. A gear cutting machine (1) in accordance with claim 19, wherein
the grinding tool (6, 8) is movable along its axis of rotation (B).
Description
BACKGROUND OF THE INVENTION
[0001] The present invention relates to a gear cutting machine for
the grinding of internal profiles or external profiles of
workpieces having a machining head, which is arranged on a
pivotable installation surface and which provides a grinding tool,
and having a dressing unit, in particular a common dressing unit,
for the dressing of the grinding tool of an installed external or
internal grinding head. A worm grinding wheel or a grinding disc
can be used as the grinding tool here, for example.
[0002] To achieve or to maintain an exact true running and the
correct geometrical shape of the grinding tool, the grinding tool
has to be shaped and sharpened at different intervals by means of
dressing. In addition, the dressing serves to true and/or calibrate
a grinding tool. It also has the purpose of breaking out
contaminants, and grain layers which have become blunt, out of the
abrasive wheel and thus to expose sharp grains. It is desirable in
this respect that this procedure of dressing by a suitable dressing
tool can be carried out, where possible in the grinding machine,
optionally during the grinding process. This so-called continuous
dressing is a special form of dressing.
[0003] DE 297 17 193 U1 describes a grinding head for the
manufacture of internal profiles of gears. FIG. 1 there shows a
complete machine having an internal grinding head which can be
pivoted to and fro between a working position and a dressing
position by a pivoting device. In detail, FIG. 2a shows the
machining position in which an internal profile of a gear can be
machined. In order now to dress the grinding disc, the arm is
pivoted upwardly and rearwardly in the direction of the grinding
head fastening and is dressed there by the dressing wheel. The
disadvantage of this embodiment is the necessity of a pivot axle so
that the position of the grinding disc at the time of dressing and
at the time of grinding differ and the precision of the pivot
bearing can thus enter into the grinding result. A further
disadvantage of this invention is the circumstance that the length
of the grinding arm and thus the maximum grindable width of the
internal toothed arrangement is limited by the pivot mechanism.
[0004] DE 103 29 724 B4 relates to a grinding head for the
manufacture of internal profiles. In this respect, a special
internal grinding head having the associated dressing device is
described. The dressing device is in this respect movable relative
to the grinding disc in the vertical direction and the grinding
disc is movable relative to the dressing direction in a direction
disposed transversely to the vertical direction of the grinding
disc. It is a disadvantage of this invention that the dressing
device is only usable for the internal grinding head and the
grinding angle of the grinding disc has to be moved back into a
basic position for the dressing during the grinding process.
SUMMARY OF THE INVENTION
[0005] It is therefore the object of the present invention to
provide a gear cutting machine for the grinding of internal and
external profiles with straight and slanting toothed arrangements
which is equipped with a dressing unit for the external dressing
and internal dressing of profiles and which avoids the
disadvantages of the above-described gear cutting machines.
Furthermore, a pivoting of the grinding tool into a basic position
for the dressing thereof should no longer be necessary. It is
likewise the object of the present invention to provide the skilled
person with an improved method for the dressing of a grinding tool
for an internal profile or an external profile.
[0006] This object is achieved by a gear cutting machine for the
grinding of external profiles or internal profiles having the
features herein. The gear cutting machine accordingly has a
machining head, which is arranged on an installation surface and
which provides a grinding tool, and in particular has a common
dressing unit for the dressing of the grinding tool of an installed
external or internal grinding head, with the gear cutting machine
having a swivel bearing for the pivoting of the grinding tool and
the dressing unit being supported at the rotation center of the
pivot axis and being pivotable about the common pivot axis together
with the grinding tool.
[0007] By the pivoting of the dressing unit together with the
grinding tool, it is no longer necessary to pivot the grinding tool
back into a specific position, i.e. into a basic position, for the
dressing. It is thus not necessary with the gear cutting machine in
accordance with the invention to provide an additional pivot axle
for the pivoting of the grinding tool in the direction of the
dressing unit, whereby it is avoided that the positions of the
grinding tool at the time of the dressing and at the time of the
grinding differ and thus the precision of the pivot bearing could
enter into the grinding result.
[0008] In an embodiment variant, the swivel bearing for the
pivoting of the grinding tool and the dressing unit are arranged at
the machine body and the grinding tool is pivotable via the pivot
axle over the pivotable installation surface and the machining head
installed thereon. The advantage results in this respect that a
common dressing unit can be used for the dressing of the grinding
tool independently of the machining head installed on the
installation surface. An internal grinding head installed on the
installation surface can, for example, be dressed by the dressing
unit of the gear cutting machine and the swapping of the internal
grinding head for an outer grinding head does not require any
further modification of the dressing unit. This considerably
reduces the time effort in the conversion of the gear cutting
machine in accordance with the invention in the production of
gears.
[0009] An alternative embodiment of the gear cutting machine in
accordance with the invention is given in that the swivel bearing
for the pivoting of the grinding tool is arranged at the end of the
machining head at the grinding disc side and the dressing unit is
likewise arranged at the end of the machining head at the grinding
disc side, whereby the dressing unit and the grinding tool are
pivotable about a common swivel axis. In this respect it is a
special embodiment variant of a machining head for the preparation
of internal profiles by means of the gear cutting machine in
accordance with the invention. In particular with internal toothed
arrangements with a larger internal workpiece diameter, the
internal grinding head can be built so large that the swivel
bearing for the pivoting of the grinding disc can be displaced
downwardly from the suspension position of the grinding head into
the tip of the internal grinding head. Furthermore, in this
embodiment of the invention, the dressing device can be positioned
within this pivot axle. A continuous dressing process can thereby
also be carried out during the grinding of an internal toothed
arrangement.
[0010] The dressing unit is advantageously movable in a linear
manner from the center of rotation of the pivot axis toward the
respective grinding tool for the dressing. In this respect, the
dressing unit is moved, starting from the center of rotation, that
is, in the specific case from the swivel bearing, along the axis of
rotation in the direction of the grinding tool. In this respect,
only a movement of the dressing unit is required for the dressing
of the grinding tool so that the grinding tool does not have to be
moved out of its original machining position. Inexactness in the
return movement of the grinding tool from a dressing position into
the machining position can thereby be avoided.
[0011] In a further advantageous manner, the dressing unit is
movable in the axial direction of the grinding disc or worm
grinding wheel. The dressing unit can thereby be moved laterally
toward the corresponding grinding tool until the dressing unit
contacts the surface of the grinding tool.
[0012] It is also conceivable in this respect that the grinding
tool is additionally movable along its axial direction in the
direction of the dressing unit. However, this only represents an
alternative to the moving of the dressing unit in the axial
direction of the grinding tool, with an attempt preferably being
made to hold the grinding tool constant at its processing position.
Due to this preferred embodiment of the gear cutting machine in
accordance with the invention, the grinding tool does not have to
be moved out of its machining position for dressing, whereby
inexactness in the machining of the workpiece is avoided which can
result from the return movement of the grinding tool from the
dressing position into the machining position.
[0013] The dressing unit advantageously provides at least one
individual dressing wheel. It is conceivable in this respect that
two individual dressing wheels can be moved in a linear fashion
along the pivot axis to the respective grinding tool and that the
two dressing wheels are movable toward the surface of the grinding
tool from the right and the left in the axial direction of the
grinding tool. The grinding tool can thereby be dressed
simultaneously from both sides or on its left flank and on its
right flank by the dressing unit.
[0014] The gear cutting machine can have a controller for the
grinding of external profiles and internal profiles, said
controller permitting an automatic control of the grinding process
of external profiles and internal profiles as well as the dressing
of the respective grinding tool used. In this respect, the control
provides an automatic execution of the machining of a corresponding
workpiece, with a dressing process being provided either parallel
to the machining process of the workpiece by the grinding tool or
the actual machining process being interrupted by the automatic
carrying out of a dressing process.
[0015] The controller advantageously has corresponding software for
the control of the gear cutting machine, with only one program or
program part being necessary for the dressing of a grinding tool
for the grinding of an external profile and/or internal profile. It
is thereby likewise achieved that, on the replacement of the
machining head of the gear cutting machine in accordance with the
invention for the grinding of external profiles or internal
profiles, no further measures have to be taken for the adaptation
of the dressing unit to the replaced machining head.
[0016] The present invention furthermore shows a method which is
suitable for the operation of a previously described gear cutting
machine for the grinding of external profiles or internal profiles.
In this respect, such a method has the following operating phases
for the dressing of a grinding tool: [0017] 1. Moving the dressing
unit in a linear direction along the pivot axis toward the grinding
tool; [0018] 2. Moving the dressing wheel or the at least two
dressing wheels in the axial direction of the grinding tool; [0019]
3. Engaging the dressing wheel or dressing wheels in each case from
the right or from the left to the surface of the grinding tool;
[0020] 4. The movements of 1. and 2. are controlled along the flank
line of the grinding tool during the dressing procedure. [0021]
Practically any desired contours are possible by a suitable control
of the movement of the dressing unit along the two axes.
Complicated flank line modifications such as are partly required
with profile grinding can thus also be realized.
[0022] It is furthermore possible that the grinding tool is
additionally moved along an axial direction in the direction of at
least one dressing wheel, whereby a time saving results during the
dressing process.
[0023] The described method for the dressing of a grinding tool in
a gear cutting machine in accordance with the invention is
advantageously controlled by an NC controller. The movements which
the dresser has to carry out are identical on the dressing of the
external disc wheels or internal disc wheels. This provides some
advantages in the software since only one program is required for
the dressing process. Practically any desired contour can
furthermore be realized by the NC control of the two axes of
movement of the dressing wheels.
[0024] The grinding tool can be dressed continuously by the
dressing unit during the grinding process of an external profile
due to the method in accordance with the invention for the
operation of the gear cutting machine in accordance with the
invention. The advantage is exploited in this respect that the
grinding tool does not have to be moved into a dressing position.
It is rather the case that the dressing unit is moved toward the
grinding tool for the dressing, whereby the grinding tool can be
dressed by the dressing unit during a grinding process. This
substantial advantage results from the feature of the gear cutting
machine in accordance with the invention that the latter has a
swivel bearing for the pivoting of the grinding tool and the
dressing device is supported at the center of rotation of the pivot
axis of the grinding tool and is pivoted about a common axis of
rotation together with the grinding tool. The dressing unit is
thereby pivoted together with the grinding tool during the
machining process of a workpiece, whereby a parallel extent of the
two wheels, that is, of the grinding tool and of the dressing
wheel, results at all times.
[0025] A few special features have to be observed in the dressing
of a grinding tool for the grinding of an internal profile. The
grinding tool is advantageously moved upwardly or downwardly out of
the toothed arrangement for the further cycling into the next gap
during the grinding of the internal profile and the dressing
process is controlled such that the grinding disc or worm grinding
wheel is always dressed by the dressing unit in the upper part
position thereof. An additional pivot movement is also not
necessary in this respect since the total internal grinding head
and the dressing device are pivoted together. This constructional
shape is preferably selected with smaller internal diameters of the
toothed arrangement.
[0026] A method in which the grinding tool is dressed continuously
by the dressing unit during the grinding process of an internal
profile can advantageously be carried out on a gear cutting machine
for the grinding of external profiles or internal profiles having a
swivel bearing arranged at an end of the machining head at the
grinding disc side for the pivoting of the grinding tool. In this
respect, the dressing unit integrated in the machining head for the
internal gear cutting is moved along into the inner space of the
tool to be processed, whereby the continuous dressing process is
made possible.
BRIEF DESCRIPTION OF THE DRAWINGS
[0027] Further features, details and advantages of the invention
result from the embodiments shown with reference to the drawing.
There are shown:
[0028] FIG. 1: the gear cutting machine in accordance with the
invention without an installed machining head;
[0029] FIG. 2: the gear cutting machine in accordance with the
invention with an installed machining head for the grinding of
external profiles;
[0030] FIG. 3: the gear cutting machine in accordance with the
invention with an installed machining head for the grinding of an
internal profile;
[0031] FIG. 4: the gear cutting machine in accordance with the
invention of FIG. 2 during a dressing process;
[0032] FIG. 5: the gear cutting machine in accordance with the
invention of FIG. 3 during a dressing process; and
[0033] FIG. 6; a modified embodiment of the gear cutting machine in
accordance with the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0034] The general design of the gear cutting machine will be
explained in more detail with reference to FIG. 1. It has a machine
table 5 for the installation of a tool receiver and a workpiece can
be clamped onto said machine table. The machine table 5 is in this
respect rotatable about an axis C which is advantageously aligned
in a perpendicular manner. Alternatively, however, horizontally
aligned workpiece receivers can also be used. The gear cutting
machine 1 furthermore has one or more installation surfaces 9 for
the installation of a machining head 2, 7 (see FIG. 2 and FIG. 3
respectively). Either an external grinding head 2 for the machining
of the external profile of a workpiece can be installed on the gear
cutting machine 1 or an internal grinding head 7 for the machining
of the internal profile of a further workpiece (see FIG. 2 and FIG.
3 respectively). One or more grinding tools 6, 8 can be clamped on
the respective machining heads 2, 7. The grinding tools 6, 8 are in
this respect set into rotation about an axis of rotation B by a
motor 11, with the axis of rotation B of the grinding tools being
pivotable in a plane which extends parallel to the axis of rotation
C of the machine table 5. For this purpose, the installation
surface 9 and thus the respective machining head 2, 7 can be
pivoted about a pivot axis A (cf. FIG. 1) which stands
perpendicular on the plane in which the axis of rotation B of the
grinding tool 6, 8 extends and which additionally extends
perpendicular to the axis of rotation C of the machine table 5. The
installation surface 9 can furthermore be displaced in a linear
manner in the direction of its axis of rotation B, that is, along
the arrow V. In addition, the installation surface 9 can be moved
in a linear manner in a direction parallel to the axis of rotation
C of the machine table 5, that is, along the arrow Z. The
installation surface can furthermore be moved in a linear fashion
in a direction perpendicular to the axis of rotation C of the
machine table 5, that is, along the arrow X to move the grinding
tools 6, 8 toward a workpiece clamped in the workpiece receiver
installed on the machine table 5 or away therefrom or to achieve
direct corrections.
[0035] The gear cutting machine 1 in accordance with the invention
furthermore has a dressing unit 3 which can dress the grinding tool
6, 8 of the machining head 2, 7 independently of the installed
machining head 2, 7. In this respect, the dressing unit 3 can be
pivoted together with the installation surfaces 9 or the installed
machining head 2, 7 about the pivot axis A which stands
perpendicular on the plane in which the axis of rotation B of the
grinding tool 6, 8 extends and which extends perpendicular to the
axis of rotation C of the machine table 5. Furthermore, the
dressing unit 3 arranged on the pivot axis A can be moved along the
pivot axis A in the direction of the arrow X2 in a linear manner to
the respective grinding tool 6, 8 for dressing. It is arranged on
an axial carriage 14 for this purpose. In this respect, the
installation surface 9 has an opening 13 through which the dressing
unit 3 can be moved starting from the machine stand 12 along the
pivot axis A in the direction of the installed grinding tool 6,
8.
[0036] The dressing unit 3 furthermore provides two individual
dressing wheels 4 which are set into rotation by a further motor
about an axis of rotation parallel to the axis of rotation B of the
grinding tool 6, 8 used. It is ensured by the gear cutting machine
1 in accordance with the invention that the axis of rotation of the
grinding tool 6, 8 and of the dressing wheels 4 extend parallel to
one another at all times independently of the degrees of freedom of
the machine movement. An undesired pivot movement on the moving
between the machining position and the dressing position is thereby
avoided. In addition, the two dressing wheels 4 can be displaced
along the axis V2 (FIG. 2), with the two dressing wheels 4 being
able to be moved in the direction V2 together or separately.
[0037] FIG. 2 shows the gear cutting machine 1 with an external
grinding head 2 installed on the installation surface 9. In this
respect, the outer grinding head 2 has a grinding tool 6 which
serves the grinding of the external profile or of the external
toothed arrangement of a corresponding workpiece clamped in a
workpiece receiver installed on the machine table 5. In this
respect, the grinding tool 6 used is set into a rotating movement
around the axis of rotation B by the motor 11. It can furthermore
be seen from FIG. 2 that the gear cutting machine 1 is in a
grinding machining process. The dressing unit 3 in accordance with
the invention is in this respect in a moved in state in which the
dressing unit 3 is positioned in direct proximity to the machine
body behind the installation surface 9 and behind the opening
13.
[0038] In FIG. 3, the gear cutting machine 1 in accordance with the
invention is shown with an internal grinding head 7 installed on
the installation surface 9. In this respect, the installation
surface 9 and the installed internal grinding head 7 are pivoted
counter clockwise about the pivot axis A. The dressing unit 3 is
likewise in the moved in state behind the installation surface 9,
with it being able to be seen that the dressing unit 3 is likewise
pivoted counter clockwise about the pivot axis A synchronously with
the internal grinding head 7. The circular surfaces of the dressing
wheels 4 and of the grinding disc 8 are thereby located on parallel
planes.
[0039] The method in accordance with the invention for the dressing
of the grinding tool 6, 8 of an internal grinding head or external
grinding head will be explained with reference to FIGS. 4, 5. In
this respect, FIG. 4 shows the dressing unit 3 moved in the
direction X2 along the pivot axis A toward the grinding tool 6.
Furthermore, the two dressing wheels 4 were moved along the axis V2
in each case from the right and/or left toward the surface of the
grinding tool 6. The dressing process of the grinding tool 6 now
takes place by the rotational movement about the axes of rotation B
of the dressing wheels 4 and of the grinding tool 6 extending in
parallel. Practically any desired contours are produced by means of
an implemented NC control by specific movements of the dressing
wheels along the directions V2, X2. Complicated profile
modifications such as are required in part in profile grinding are
thus also possible.
[0040] The corresponding dressing process of the gear cutting
machine 1 is shown in FIG. 5 for an installed internal grinding
head 7.
[0041] If the two axes of rotation B of the individual grinding
tools 6 and 8 respectively of the two machining heads 2, 7 are
identical, that is, if they have the identical location in space,
the movements which the dressing unit has to perform are identical
in the dressing of the external grinding discs or internal grinding
discs. This provides some advantages for the preparation of the
control software since only one program is required for the
dressing process.
[0042] In the embodiment variant of the gear cutting machine 1 in
accordance with the invention having an installed external grinding
head 2 shown in FIG. 4, a continuous dressing process is possible
during the grinding process.
[0043] In the gear cutting machine 1 in accordance with the
invention having an installed internal grinding head 7, some
special features must be observed in the dressing of the internal
grinding disc 8, as can be seen in FIG. 5. In this respect, on
internal profile grinding in the individual part process, the
grinding tool 8 is moved upwardly or downwardly for the further
cycling into the next gap, that is, along the arrow direction Z,
out of the toothed arrangement so that the grinding tool 8 does not
collide with the tooth flank. If the dressing process is controlled
so that dressing also always takes place in the upper part
position, only slight additional paths upwardly are required to
provide sufficient free space for the dressing unit 3 above the
workpiece. An additional pivot movement is not necessary since the
total internal grinding head 7 and the dressing unit 3 are pivoted
together.
[0044] FIG. 6 shows an alternative embodiment variant of the gear
cutting machine 1 in accordance with the invention having a large
internal grinding head 7 with a grinding tool 8 clamped on. The
same components as in the previously described embodiments have the
same reference numerals in FIG. 6.
* * * * *