U.S. patent application number 10/710787 was filed with the patent office on 2006-02-09 for tool holder assembly.
This patent application is currently assigned to FORD MOTOR COMPANY. Invention is credited to Ed Exner, George Nordstrom, Alexander Stoll.
Application Number | 20060029479 10/710787 |
Document ID | / |
Family ID | 34911175 |
Filed Date | 2006-02-09 |
United States Patent
Application |
20060029479 |
Kind Code |
A1 |
Stoll; Alexander ; et
al. |
February 9, 2006 |
TOOL HOLDER ASSEMBLY
Abstract
A tool holder assembly including a cutting tool, a tool holder,
and an adapter. The cutting tool includes a fluid passage and an
end portion. The tool holder includes a conduit and a counterbore
adapted to receive the cutting tool. The adapter includes a tool
receiving portion configured to receive the end portion and an
internal fluid passage adapted to provide a fluid from the conduit
to the fluid passage.
Inventors: |
Stoll; Alexander; (Plymouth,
MI) ; Exner; Ed; (Troy, MI) ; Nordstrom;
George; (Sterling Heights, MI) |
Correspondence
Address: |
BROOKS KUSHMAN P.C./FGTL
1000 TOWN CENTER
22ND FLOOR
SOUTHFIELD
MI
48075-1238
US
|
Assignee: |
FORD MOTOR COMPANY
The American Road
Dearborn
MI
|
Family ID: |
34911175 |
Appl. No.: |
10/710787 |
Filed: |
August 3, 2004 |
Current U.S.
Class: |
409/136 ;
409/234 |
Current CPC
Class: |
B23B 2260/136 20130101;
B23B 31/1179 20130101; Y10T 279/17111 20150115; B23B 2260/126
20130101; B23B 2250/12 20130101; Y10T 408/45 20150115; B23B 51/06
20130101; Y10T 408/44 20150115; Y10T 409/304032 20150115; Y10T
409/30952 20150115 |
Class at
Publication: |
409/136 ;
409/234 |
International
Class: |
B23C 1/00 20060101
B23C001/00 |
Claims
1. A tool holder assembly comprising: a cutting tool including: a
main portion; an end portion disposed proximate the main portion;
and a fluid passage disposed in the main and end portions; a tool
holder including: a conduit; and a counterbore axially aligned with
the conduit and adapted to receive the cutting tool; and an adapter
including: a tool receiving portion configured to receive the end
portion; a body portion disposed proximate the tool receiving
portion and adapted to engage the conduit; and an internal fluid
passage defined by the tool receiving and body portions that is
adapted to provide a fluid from the conduit to the fluid
passage.
2. The tool holder assembly of claim 1 wherein the internal fluid
passage further includes a chamfer disposed proximate the tool
receiving portion and adapted to direct a fluid to the fluid
passage.
3. The tool holder assembly of claim 1 wherein the adapter further
comprises a first internal fluid passage disposed in the body
portion and second and third internal fluid passages disposed in
the tool receiving portion proximate the first internal fluid
passage.
4. The tool holder assembly of claim 1 wherein the counterbore
further comprises a bottom surface disposed proximate the
conduit.
5. The tool holder assembly of claim 4 further comprising a spring
disposed between the tool receiving portion and the bottom surface
for biasing the adapter against the end portion.
6. The tool holder assembly of claim 1 further comprising a seal
disposed between the end portion and the tool receiving portion for
inhibiting fluid leakage.
7. A tool holder assembly comprising: a cutting tool including: a
main portion having a first diameter; an end portion having a
second diameter; and a fluid passage disposed in the main and end
portions; a tool holder configured to rotate about an axis of
rotation including: a conduit; and a counterbore adapted to receive
the cutting tool and having a bottom surface; and an adapter
including: a tool receiving portion configured to receive the end
portion; a body portion disposed proximate the tool receiving
portion and adapted to engage the conduit; and an internal fluid
passage defined by the tool receiving and body portions that is
adapted to provide a fluid from the conduit to the fluid passage;
and a spring configured to bias the adapter against the cutting
tool to inhibit fluid leakage.
8. The tool holder assembly of claim 7 wherein the spring is
configured to engage the bottom surface and the tool receiving
portion.
9. The tool holder assembly of claim 7 wherein the internal fluid
passage further includes a chamfer disposed proximate the tool
receiving portion and adapted to direct a fluid to the fluid
passage.
10. The tool holder assembly of claim 7 wherein the adapter further
comprises a first internal fluid passage disposed in the body
portion and second and third internal fluid passages disposed in
the tool receiving portion proximate the first internal fluid
passage.
11. The tool holder assembly of claim 7 further comprising a seal
disposed between the end portion and the tool receiving portion for
inhibiting fluid leakage.
12. The tool holder assembly of claim 7 wherein the second diameter
is configured to flex about the axis of rotation to facilitate
insertion of the adapter into the conduit.
13. The tool holder assembly of claim 7 wherein the first diameter
is larger than the second diameter.
14. The tool holder assembly of claim 7 wherein the end portion
further includes a first fluid passage and the main portion further
comprises a plurality of branch fluid passages disposed about the
axis of rotation and a chamber disposed proximate the first fluid
passage and the plurality of branch fluid passages.
15. The tool holder assembly of claim 14 wherein the chamber has a
tapered surface for directing fluid flow from the first fluid
passage to the plurality of branch fluid passages.
16. A tool holder assembly comprising: a cutting tool including: a
main portion having a first fluid passage; an adapter portion
disposed proximate the main portion, the adapter portion having a
second fluid passage disposed coaxially with an axis of rotation
and connected to the first fluid passage; and a tool holder
including: a conduit adapted to receive at least a portion of the
adapter portion and provide a fluid to the second fluid passage;
and a counterbore axially aligned with the conduit and adapted to
receive the cutting tool.
17. The tool holder assembly of claim 16 wherein the main portion
has a first diameter, the adapter portion has a second diameter,
and the first diameter is greater than the second diameter.
18. The tool holder assembly of claim 16 wherein the adapter
portion is configured to flex about the axis of rotation to
facilitate insertion of the adapter portion into the conduit.
19. The tool holder assembly of claim 16 wherein the main portion
further comprises a plurality of branch fluid passages disposed
about the axis of rotation and a chamber disposed proximate the
second fluid passage and the plurality of branch fluid
passages.
20. The tool holder assembly of claim 19 wherein the chamber has a
tapered surface for directing fluid flow from the second fluid
passage to the plurality of branch fluid passages.
Description
BACKGROUND OF INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to a tool holder assembly, and
more particularly to a tool holder assembly incorporating an
adapter configured to deliver a fluid to a cutting tool.
[0003] 2. Background Art
[0004] Previously, drill chucks incorporated a fluid supply hole
adapted to receive a straight shank of an oil-through-drill, as
described in U.S. Pat. No. 5,649,714. In that patent, a seal block
was positioned in the fluid supply hole to regulate fluid flow into
a fluid channel of the oil-through-drill and into a gap portion
between the fluid supply hole and the straight shank portion. Such
drill chucks did not address the desirability of gap-free sealing
between a cutting tool and an adapter to inhibit fluid leakage and
improve tool life. Moreover, such drill chucks were not configured
for use with a minimum quantity lubrication (MQL) machining system
in which very limited amounts of lubricant are provided at high
pressure to the cutting surfaces of the cutting tool to sustain the
machining process. In addition, such chucks did not incorporate
adjustment screws to facilitate the axial positioning of the
cutting tool.
[0005] Before Applicants' invention, there was a need for a tool
holder assembly that was compatible with an MQL machining system
and facilitated the supply of pressurized fluid to the cutting
surfaces of a cutting tool while inhibiting fluid leakage. In
addition, there was a need to incorporate the functionality of an
adjustment screw to accurately position the cutting tool without
the need to manufacture, position, and install a separate
adjustment screw component. Problems associated with the prior art
as noted above and other problems are addressed by Applicants'
invention as summarized below.
SUMMARY OF INVENTION
[0006] According to one aspect of the present invention, a tool
holder assembly is provided. The tool holder assembly includes a
cutting tool, a tool holder, and an adapter. The cutting tool
includes a main portion, an end portion, and a fluid passage. The
main portion has a first diameter. The end portion has a second
diameter and is disposed proximate the main portion. The fluid
passage is disposed in the main and end portions. The tool holder
includes a conduit and a counterbore. The counterbore is adapted to
receive the cutting tool and is axially aligned with the conduit.
The adapter includes a tool receiving portion, a body portion, and
an internal fluid passage. The tool receiving portion is configured
to receive the end portion. The body portion is disposed proximate
the tool receiving portion and is adapted to engage the conduit.
The internal fluid passage is defined by the tool receiving and
body portions and is adapted to provide a fluid from the conduit to
the fluid passage.
[0007] The internal fluid passage may include a chamfer disposed
proximate the tool receiving portion that is adapted to direct
fluid to the fluid passage.
[0008] The adapter may include a first internal fluid passage
disposed in the body portion and a second and third internal fluid
passages disposed in the tool receiving portion proximate the first
internal fluid passage.
[0009] The counterbore may include a bottom surface. A spring may
be disposed between the tool receiving portion and the bottom
surface for biasing the adapter against the end portion.
[0010] A seal may be disposed between the end portion and the tool
receiving portion for inhibiting fluid leakage.
[0011] According to another aspect of the present invention, a tool
holder assembly is provided. The tool holder assembly includes a
cutting tool, a tool holder, an adapter, and a spring. The cutting
tool includes a main portion, an end portion, and a fluid passage.
The main portion has a first diameter. The end portion has a second
diameter. The fluid passage is disposed in the main and end
portions. The tool holder is configured to rotate about an axis of
rotation and includes a conduit and a counterbore. The counterbore
is adapted to receive the cutting tool and has a bottom surface.
The adapter includes a tool receiving portion, a body portion, and
an internal fluid passage. The tool receiving portion is configured
to receive the end portion. The body portion is disposed proximate
the tool receiving portion and is adapted to engage the conduit.
The internal fluid passage is defined by the tool receiving and
body portions and is adapted to provide a fluid from the conduit to
the fluid passage. The spring is configured to bias the adapter
against the cutting tool to inhibit fluid leakage.
[0012] The adapter may be configured to flex about the axis of
rotation to facilitate insertion of the adapter into the
conduit.
[0013] According to another aspect of the present invention, a tool
holder assembly is provided. The tool holder assembly includes a
cutting tool and a tool holder. The cutting tool includes a main
portion and an adapter portion. The main portion has a first
diameter and a first fluid passage. The adapter portion is disposed
proximate the main portion and has a second diameter and a second
fluid passage disposed coaxially with an axis of rotation and
connected to the first fluid passage. The tool holder includes a
conduit and a counterbore. The conduit is adapted to receive the
adapter portion and provide a fluid to the second fluid passage.
The counterbore is adapted to receive the cutting tool and is
axially aligned with the conduit.
BRIEF DESCRIPTION OF DRAWINGS
[0014] FIG. 1 is a section view of a first embodiment of a tool
holder assembly.
[0015] FIG. 2 is a section view of a second embodiment of the tool
holder assembly.
[0016] FIG. 3 is a section view of a third embodiment of the tool
holder assembly.
[0017] FIG. 4 is a section view of a fourth embodiment of the tool
holder assembly.
DETAILED DESCRIPTION
[0018] Referring to FIG. 1, one embodiment of a tool holder
assembly 10 is shown. In this embodiment, the tool holder assembly
10 includes a cutting tool 12, a tool holder 14, and an adapter
16.
[0019] The cutting tool 12 includes a shank or main portion 20, an
end portion 22, one or more cutting surfaces 24, and one or more
fluid passages 26. The cutting tool 12 may have any suitable
configuration and may be of any suitable type, such as a chamfer
tool, counterbore, drill, mill, reamer, or tap.
[0020] The end portion 22 is disposed proximate the main portion
20. The end portion 22 may have any suitable configuration for
mating with the adapter 16. In the embodiment shown in FIG. 1, the
end portion 22 has a male configuration and a smaller diameter than
the main portion 20. In addition, the end portion 22 may have a
generally planar, contoured, or chamfered end surface that helps
position or center the cutting tool 12.
[0021] The fluid passages 26 extend through the cutting tool 12 and
are configured to provide a fluid proximate the cutting surface 24.
The fluid passages 26 may have any suitable configuration. In the
embodiment shown in FIG. 1, the fluid passages 26 are aligned
generally parallel to and spaced apart from an axis of rotation
28.
[0022] The tool holder 14 is configured to hold the cutting tool 12
and rotate about the axis of rotation 28. More specifically, the
tool holder 14 is configured to be connected to a spindle or other
suitable device that is adapted to rotate the tool holder 14. The
tool holder 14 may be of any suitable type, such as shrink fit
holder or chuck. Also, the tool holder 14 may be made of any
suitable material, such as a polymeric material or a metal.
[0023] The tool holder 14 includes a counterbore 30 and a conduit
32. The counterbore 30 is adapted to receive the cutting tool 12
and includes a bottom surface 34. The counterbore 30 may have any
suitable configuration for receiving and holding the cutting tool
12. Optionally, the cutting tool 12 may be secured to the tool
holder 14 in any suitable manner, such as with one or more set
screws as is known by those skilled in the art.
[0024] The conduit 32 is adapted to provide a fluid to the cutting
tool 12. For example, the conduit 32 may be connected to a fluid
supply pipe or fluid source that is adapted to provide any suitable
fluid, such as a coolant or lubricant in the form of an aerosol,
gas, or liquid. The conduit 32 may have any suitable configuration.
For example, the conduit 32 may be integrally formed with the tool
holder 14, may be a separate component attached to and extending
through the tool holder 14, or may be defined by a combination of
integrally formed tool holder surfaces and separate components. In
the embodiment shown in FIG. 1, the conduit 32 includes a narrow
portion 36 of the tool holder 14 and a pipe 38 coupled to the tool
holder 14 with a fastener 40. Also, the conduit 32 may be disposed
concentrically with the axis of rotation 28 and may have a smaller
inside diameter than the counterbore 30.
[0025] The adapter 16 includes a body portion 50 and a tool
receiving portion 52. The adapter 16 is configured to receive the
end portion 22 to inhibit fluid leakage and help position the
cutting tool 12. The adapter 16 may be made of any suitable
material, such as a polymeric material or a metal.
[0026] The body portion 50 and the tool receiving portion 52
cooperate to define an internal fluid passage 54. The internal
fluid passage 54 may be disposed coaxially with the conduit 32.
[0027] The body portion 50 is adapted to engage the conduit 32.
More specifically, the body portion 40 may be configured to attach
to or seal against the inside of the conduit 32 to inhibit fluid
leakage. The body portion 50 may have any suitable configuration.
In the embodiment shown in FIG. 1, the body portion 50 includes a
first section 56 disposed proximate the pipe 38 and a second
section 58 disposed proximate the narrow portion 36. Alternatively,
the second section 58 may be omitted and the first section 56 may
extend from the bottom surface of the tool receiving portion 52.
Optionally, the first or second sections 56,58 may have a threaded
portion disposed on an exterior surface.
[0028] The tool receiving portion 52 may include a socket or recess
60 adapted to receive the cutting tool 12. More specifically, the
recess 60 may have a similar configuration as the end portion 22.
Optionally, the recess 60 may have a larger outside diameter than
the body portion 50 to help position the adapter 16 within the
counterbore 30.
[0029] The adapter 16 may include a chamfer 62 disposed in the
recess 60 proximate the internal fluid passage 54 to improve fluid
flow and fluid distribution to the fluid passages 26. More
particularly, the chamfer 62 and centrifugal forces present when
the tool holder assembly 10 is rotated cooperate to direct fluid
from the internal fluid passage 54 outward to the fluid passages
26.
[0030] Optionally, a seal 70 may be disposed between the tool
receiving portion 52 and the end portion 22 to further inhibit
fluid leakage. The seal 70 may have any suitable configuration. In
one embodiment, the seal 70 is at least partially disposed in a
groove located on the end portion 22 or the tool receiving portion
52.
[0031] In addition, adapters having different configurations may be
associated with each type or size of cutting tool. For example,
adapters wherein the first and/or second sections 56,58 have
different geometries or cross-sections for each tool may be
employed to help insure that the correct adapter is used with a
particular cutting tool.
[0032] Referring to FIG. 2, a second embodiment of the tool holder
assembly 100 is shown. In this embodiment, the tool holder assembly
100 includes a cutting tool 112 and a tool holder 114 having an
integral adapter portion 116.
[0033] The cutting tool 112 includes a main portion 120, one or
more cutting surfaces 124, one or more fluid passages 126, and may
be rotatable about an axis of rotation 128 as previously
described.
[0034] The tool holder 114 includes a counterbore 130 and a conduit
132. The counterbore 130 has a bottom surface 134. The conduit 132
may have any suitable configuration and may include a narrow
portion 136 and/or a pipe 138 coupled to the tool holder 114 with a
fastener 140 as previously described.
[0035] The adapter portion 116 includes an internal fluid passage
154. In the embodiment shown in FIG. 2, the internal fluid passage
154 also extends partially into the main portion 120. The adapter
portion 116 may also have a first section 156 disposed proximate
the pipe 138 and a second section 158 disposed proximate the narrow
portion 136.
[0036] A chamber 160 may connect the internal fluid passage 154 and
the tool fluid passages 126. The chamber 160 may include a tapered
surface or chamfer 162 to improve flow and distribution to the
fluid passages 126 as previously described.
[0037] Referring to FIG. 3, a third embodiment of the tool holder
assembly 200 is shown. Similar to FIG. 1, the tool holder assembly
200 includes a cutting tool 212, a tool holder 214, and an adapter
216.
[0038] The cutting tool 212 may include a main portion 220, one or
more cutting surfaces 224, a plurality of fluid passages 226, and
may be rotatable about an axis of rotation 228 as previously
described.
[0039] The tool holder 214 includes a counterbore 230 and a conduit
232. The counterbore 230 has a bottom surface 234. The conduit 232
may have any suitable configuration and may include a narrow
portion 236 and/or a pipe 238 coupled to the tool holder 214 with a
fastener 240 as previously described.
[0040] The adapter 216 may include a body portion 250 and a tool
receiving portion 252, as previously described. The body portion
250 may also include a first internal fluid passage 254, a first
section 256 disposed proximate the pipe 238 and a second section
258 disposed proximate the narrow portion 236.
[0041] The tool receiving portion 252 includes a plurality of
additional fluid passages. In one embodiment, the tool receiving
portion 252 includes second and third internal fluid passages
260,262 connected to the first internal passage 254 and to
different tool fluid passage 226. The first and/or second internal
fluid passages 260,262 may be angled or include a curved or tapered
surface to improve fluid flow and distribution to the tool fluid
passages 226.
[0042] Referring to FIG. 4, a fourth embodiment of the tool holder
assembly 300 is shown. In this embodiment, the tool holder assembly
300 includes a cutting tool 312, a tool holder 314, an adapter 316,
and a spring 318.
[0043] The cutting tool 312 may include a main portion 320, an end
portion 322, one or more cutting surfaces 324, one or more fluid
passages 326, and may be rotatable about an axis of rotation 328 as
previously described.
[0044] The tool holder 314 includes a counterbore 330 and a conduit
332. The counterbore 330 has a bottom surface 334. The conduit 332
may include a narrow portion 336 and/or a pipe 338 coupled to the
tool holder 314 with a fastener 340.
[0045] The adapter 316 may include a body portion 350, a tool
receiving portion 352, and an internal fluid passage 354, a first
section 356, a second section 358, a recess 360, and a chamfer 362
as previously described.
[0046] The spring 318 is adapted to engage the tool receiving
portion 352 and the bottom surface 340 to bias the adapter 316 into
engagement with the end portion 322 to position the tool and
inhibit fluid leakage.
[0047] The tool holder assemblies 10,100,200,300 described above
may be employed with any suitable machining process or fluid
delivery system. For example, the tool holder assemblies
10,100,200,300 may be used with a minimum quantity lubrication
(MQL) system. In an MQL system, a pressurized lubricating fluid,
such as an oil mist, is provided through the tool holder
14,114,214,314 and cutting tool 12,112,212,312 to the cutting
surfaces 24,124,224,324. Fluid delivery is controlled to provide
just enough lubrication to sustain the machining process.
Consequently, it is desirable to provide gap-free sealing between
the cutting tool 12,112,212,312 and the adapter 16,216,316 or
conduit to inhibit fluid leakage and improve tool life. Providing
gap-free sealing without manual intervention or manual adjustments
to a tool positioning screw is desirable to help insure quality of
the finished part. For example, gap-free sealing without manual
adjustments is desirable in processes that "reuse" tools by
regrinding or resharpening cutting surfaces and thereby alter the
tool length.
[0048] While the best mode for carrying out the invention has been
described in detail, those familiar with the art to which this
invention relates will recognize various alternative designs and
embodiments for practicing the invention as defined by the
following claims.
* * * * *