US20200086398A1 - Coolant collet assembly - Google Patents
Coolant collet assembly Download PDFInfo
- Publication number
- US20200086398A1 US20200086398A1 US16/131,528 US201816131528A US2020086398A1 US 20200086398 A1 US20200086398 A1 US 20200086398A1 US 201816131528 A US201816131528 A US 201816131528A US 2020086398 A1 US2020086398 A1 US 2020086398A1
- Authority
- US
- United States
- Prior art keywords
- collet body
- coolant
- cutter
- collet
- slits
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
- B23B31/02—Chucks
- B23B31/10—Chucks characterised by the retaining or gripping devices or their immediate operating means
- B23B31/12—Chucks with simultaneously-acting jaws, whether or not also individually adjustable
- B23B31/20—Longitudinally-split sleeves, e.g. collet chucks
- B23B31/201—Characterized by features relating primarily to remote control of the gripping means
- B23B31/202—Details of the jaws
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
- B23B31/02—Chucks
- B23B31/10—Chucks characterised by the retaining or gripping devices or their immediate operating means
- B23B31/12—Chucks with simultaneously-acting jaws, whether or not also individually adjustable
- B23B31/20—Longitudinally-split sleeves, e.g. collet chucks
- B23B31/201—Characterized by features relating primarily to remote control of the gripping means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
- B23B31/02—Chucks
- B23B31/10—Chucks characterised by the retaining or gripping devices or their immediate operating means
- B23B31/12—Chucks with simultaneously-acting jaws, whether or not also individually adjustable
- B23B31/20—Longitudinally-split sleeves, e.g. collet chucks
- B23B31/201—Characterized by features relating primarily to remote control of the gripping means
- B23B31/2012—Threaded cam actuator
- B23B31/20125—Axially fixed cam, moving jaws
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2231/00—Details of chucks, toolholder shanks or tool shanks
- B23B2231/20—Collet chucks
- B23B2231/2089—Slits of collets
- B23B2231/2091—Slits of collets extending from both axial ends of the collet
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2231/00—Details of chucks, toolholder shanks or tool shanks
- B23B2231/24—Cooling or lubrication means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2250/00—Compensating adverse effects during turning, boring or drilling
- B23B2250/12—Cooling and lubrication
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T279/00—Chucks or sockets
- Y10T279/17—Socket type
- Y10T279/17111—Fluid-conduit drill holding
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T279/00—Chucks or sockets
- Y10T279/17—Socket type
- Y10T279/17411—Spring biased jaws
- Y10T279/17418—Unitary
- Y10T279/17435—Split at both ends
Definitions
- the present invention relates to a cutter holder assembly for a machining tool, and more particularly to a coolant collet assembly that has coolant channels formed in the collet body to cool the cutter.
- a collet is a component for clamping a cutter, and has multiple slits to provide flexible deformation to clamp the cutter tightly.
- Conventional cutters may include two types, one with coolant holes and the other without any coolant hole.
- the cutter with coolant holes is used on a machining tool with a center coolant system.
- the coolant from the center coolant system may flow through the coolant holes of the cutter to cool the working cutter.
- the cutter without any coolant hole may be cooled by an extra coolant system instead of the center coolant system of the machining tool, because the coolant from the center coolant system may not flow through the cutter and may be congested on the mounting end of the cutter and the heating point of the working cutter may not be cooled efficiently.
- the present invention tends to provide a coolant collet assembly to mitigate or obviate the aforementioned problems.
- the main objective of the invention is to provide a coolant collet assembly that has coolant channels having openings formed in an end of the collet body, and coolant from the center coolant system may flow through the coolant channels of the collet body to cool the heating point of the working cutter.
- the coolant collet assembly in accordance with the present invention has a collet body and a cutter.
- the collet body has an outer end, an inner end, an annular groove, a cutter hole, multiple external slits, multiple internal slits, and multiple coolant channels.
- the outer end and the inner end are opposite each other.
- the annular groove is defined around the outer surface of the collet body and is located near the outer end.
- the cutter hole is defined axially in the collet body along the center axis of the collet body.
- the external slits are defined radially in the collet body, are arranged around the cutter hole at equiangular intervals, extend longitudinally from the outer end, and communicate with the cutter hole.
- Each external slit has an outer opening formed in the outer surface, an end opening formed on the outer end, an inner opening communicating with the cutter hole, an inner edge adjacent to the cutter hole and opposite the outer end of the collet body, and an outer edge on the outer surface and opposite the outer end of the collet body.
- each external slit is shorter than the longitudinal length of the collet body.
- the internal slits are defined radially in the collet body, are arranged around the cutter hole at equiangular intervals, extend longitudinally from the inner end, communicate with the cutter hole, and are in a staggered arrangement with the external slits.
- Each internal slit has an outer opening formed in the outer surface, an end opening formed on the inner end, and an inner opening communicating with the cutter hole.
- An extension length of each internal slit is shorter than a distance from the inner end to the annular groove.
- a width of each internal slit is larger than the width of each external slit.
- the coolant channels are defined longitudinally in the collet body around the cutter hole, converged radially toward the outer end.
- Each coolant channel has a hole axis, an end communicating with a respective one of the internal slits, and an opening formed in the outer end.
- An angle between the hole axis and the center axis is greater than 0 degree and less than or equal to 12 degrees.
- the cutter has a mounting end and a cutting end, and is inserted in the cutter hole of the collet body from the mounting end and protruding from the outer end of the collet body, wherein a distance from the outer end of the collet body to the cutting end of the cutter is four times of the diameter of the cutter.
- FIG. 1 is a perspective view of a first embodiment of a collet body of a collet assembly in accordance with the present invention
- FIG. 2 is another perspective view of the collet body of the collet assembly in FIG. 1 ;
- FIG. 3 is a cross sectional side view of the collet assembly in accordance with the present invention.
- FIG. 4 is another cross sectional side view of the collet assembly in FIG. 3 ;
- FIG. 5 is an end side view of the collet body of the collet assembly in FIG. 1 ;
- FIG. 6 is an operational cross sectional side view of the collet assembly in FIG. 3 assembled on a cutter holder
- FIG. 7 is an operational cross sectional side view of the cutter holder with the collet assembly in FIG. 6 ;
- FIG. 8 is a perspective view in partial section of a second embodiment of a collet assembly in accordance with the present invention.
- FIG. 9 is an operational cross sectional side view of a third embodiment of a collet assembly in accordance with the present invention.
- a collet assembly in accordance with the present invention comprises a collet body 10 and a cutter 20 .
- the collet body 10 has a center axis X, an outer end 11 , an inner end 12 , an outer surface, an annular groove 13 , a cutter hole 14 , eight external slits 15 , eight internal slits 16 , and four coolant channels 17 .
- the outer end 11 and the inner end 12 are opposite each other.
- the annular groove 13 is defined around and recessed in the outer surface and is located near the outer end 11 .
- the collet body 10 is formed as a bicone, and a diameter of the collet body 10 where the annular groove 13 is formed is larger than a diameter of the outer end 11 and a diameter of the inner end 12 .
- the cutter hole 14 is defined axially in the collet body 10 along the center axis X.
- the external slits 15 are defined radially in the collet body 10 , are arranged around the cutter hole 14 at equiangular intervals, extend longitudinally from the outer end 11 , and communicate with the cutter hole 14 .
- Each external slit 15 has an outer opening formed in the outer surface of the collet body 10 , an end opening formed on the outer end 11 , an inner opening communicating with the cutter hole 14 , an inner edge 151 adjacent to the cutter hole 14 and opposite the outer end 11 , and an outer edge 152 on the outer surface of the collet body 10 and opposite the outer end 11 .
- each external slit 15 is shorter than the longitudinal length 10 L of the collet body 10 , and a distance from the outer end 11 to the inner edge 151 of each external slit 15 is shorter than a distance from the outer end 11 to the outer edge 152 of each external slit 15 .
- the internal slits 16 are defined radially in the collet body 10 , are arranged around the cutter hole 14 at equiangular intervals, are in a staggered arrangement with the external slits 15 at equiangular intervals, extend longitudinally from the inner end 12 , and communicate with the cutter hole 14 .
- Each internal slit 16 has an outer opening formed in the outer surface of the collet body 10 , an end opening formed on the inner end 12 , an inner opening communicating with the cutter hole 14 , and an inner edge 161 adjacent to the cutter hole 14 and opposite the inner end 12 .
- An extension length 16 L of each internal slit 16 is shorter than a distance from the inner end 12 to the annular groove 13 .
- a width C of each internal slit 16 is larger than a width E of each external slit 15 .
- a distance from the inner end 12 to the inner edge 161 of each internal slit 16 is larger than a distance from the inner end 12 to the inner edge 151 of each external slit 15 , and each external slit 15 and each internal slit 16 have an overlapping segment M defined on the surface of the cutter hole 14 from a position on the inner edge 161 of each internal slit 16 to a corresponding position on the inner edge 151 of each external slit 15 .
- the coolant channels 17 are defined longitudinally in the collet body 10 , are arranged around the cutter hole 14 , and are converged radially toward the outer end 11 .
- Each coolant channel 17 has a hole axis A, an end communicating with a respective one of the internal slits 16 , and an opening formed in the outer end 11 .
- An angle ⁇ between the hole axis A of each coolant channel 17 and center axis X is greater than 0 degree and less than or equal to 12 degrees, and the hole axis A of each coolant channel 17 and the center axis X intersect with each other in a position outside of the collet body 10 opposite the inner end 12 and away from the outer end 11 .
- the cutter 20 is a cutter without coolant channels, has a mounting end and a cutting end, is inserted in the cutter hole 14 from the mounting end, and protrudes from the outer end 11 of the collet body 10 .
- a distance L from the cutting end of the cutter 20 to the outer end 11 of the collet body 10 is four times of the diameter D of the cutter 20 .
- the amounts of the external slits 15 and the internal slits 16 may each be eight, and the amounts of the coolant channels 17 may be four as shown in FIG. 1 , or the collet body 10 A may have six external slits 15 A, six internal slits 16 A and three coolant channels 17 A as shown in FIG. 8 .
- the collet body 10 when mounting the collet assembly in accordance with the present invention into a cutter holder 30 , the collet body 10 is inserted into a conical recess 31 of the cutter holder 30 from the inner end 12 .
- a nut 40 is mounted around the collet body 10 with the engagement between an inner flange of the nut 40 and the annular groove 13 of the collet body 10 .
- the cutter 20 is inserted in the cutter hole 14 of the collet body 10 from the mounting end.
- the nut 40 is screwed with the cutter holder 30 to push the collet body 10 into the conical recess 31 of the cutter holder 30 to contract the external slits 15 , the internal slits 16 and the cutter hole 14 of the collet body 10 to clamp the cutter 20 at a desired assembly position tightly.
- each internal slit 16 is larger than the width E of each external slit 15 , the collet body 10 has a better flexible deformation on the inner portion of the collet body 10 near the inner end 12 than on the outer portion of the collet body 10 near the outer end 11 .
- each external slit 15 and each internal slit 16 have the overlapping segment M formed in the surface of the cutter hole 14 , the collet body 10 may provide a steady clamping force to clamp the cutter 20 by contractions of the external slits 15 and the internal slits 16 .
- the distance L from the cutting end of the cutter 20 to the outer end 11 of the collet body 10 is equal to four times of the diameter D of the cutter 20 , the clamping force and the clamping stability of the collet body 10 , and the cutting efficiency and the cutting precision of the cutter 20 can be optimally balanced.
- the coolant when the coolant from the center coolant system flows into the cutter holder 30 , the coolant will flow in the internal slits 16 and the cutter hole 14 of the collet body 10 from the inner end 12 . Because the outer openings of the internal slits 16 formed in the outer surface of the collet body 10 is closed by the conical recess 31 of the cutter holder 30 and the cutter hole 14 is blocked by the cutter 20 , the coolant will flow through the coolant channels 17 , and will be guided to and converged to the heating point of the working cutter 20 with the arrangement of the coolant channels 17 converged toward the outer end 11 .
- the length of the distance L depends on the length of the diameter D of the cutter 20 .
- the angle ⁇ between the center axis X and the hole axis A of each coolant channel 17 corresponds to the distance L, and when the diameter D of the cutter 20 is larger, the angle ⁇ between the center axis X and the hole axis of each coolant channel 17 will be smaller.
- the preferred range of the angle ⁇ is greater than 0 degree and less than or equal to 12 degrees, whereby a good cooling effect for cooling the cutter 20 can be provided.
- each external slit 15 is shorter than the distance from the outer end 11 to the outer edge 151 of each external slit 15 , and the inner openings of the external slits 15 communicating with the cutter hole 14 may be closed by the cutter 20 inserted in the cutter hole 14 . So the coolant will not be diverted to the external slits 15 , and will be concentrated to the coolant channels 17 to provide an optimal cooling efficiency for cooling the cutter 20 .
- a third embodiment of the collet assembly in accordance with the present invention is assembled on a cutter holder 30 .
- Multiple plugs 19 are respectively detachably mounted in the coolant channels 17 B and close the openings of the coolant channels 17 B on the outer end 11 B of the collet body 10 B.
- the plugs 19 may be rubber plugs, bolts, and so on.
- a cutter 20 A having coolant holes 21 A defined therethrough may be inserted in the cutter hole of the collet body 10 B and a distance from the outer end 11 B of the collet body 10 B to the mounting end of the cutter 20 A is larger than a distance from the outer end 11 B of the collet body 10 B to the inner edge of each external slit of the collet body 10 B.
- the coolant may be concentrated to the coolant holes 21 of the cutter 20 A to provide an optimal cooling efficiency for cooling the cutter 20 A.
- the plugs 19 may be detached from the coolant channels 17 B of the collet body 10 B and the coolant may flow out from the coolant channels 17 B to cool the cutter 20 .
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Abstract
Description
- The present invention relates to a cutter holder assembly for a machining tool, and more particularly to a coolant collet assembly that has coolant channels formed in the collet body to cool the cutter.
- A collet is a component for clamping a cutter, and has multiple slits to provide flexible deformation to clamp the cutter tightly.
- Conventional cutters may include two types, one with coolant holes and the other without any coolant hole. The cutter with coolant holes is used on a machining tool with a center coolant system. The coolant from the center coolant system may flow through the coolant holes of the cutter to cool the working cutter. The cutter without any coolant hole may be cooled by an extra coolant system instead of the center coolant system of the machining tool, because the coolant from the center coolant system may not flow through the cutter and may be congested on the mounting end of the cutter and the heating point of the working cutter may not be cooled efficiently.
- To overcome the shortcomings, the present invention tends to provide a coolant collet assembly to mitigate or obviate the aforementioned problems.
- The main objective of the invention is to provide a coolant collet assembly that has coolant channels having openings formed in an end of the collet body, and coolant from the center coolant system may flow through the coolant channels of the collet body to cool the heating point of the working cutter.
- The coolant collet assembly in accordance with the present invention has a collet body and a cutter.
- The collet body has an outer end, an inner end, an annular groove, a cutter hole, multiple external slits, multiple internal slits, and multiple coolant channels.
- The outer end and the inner end are opposite each other. The annular groove is defined around the outer surface of the collet body and is located near the outer end. The cutter hole is defined axially in the collet body along the center axis of the collet body. The external slits are defined radially in the collet body, are arranged around the cutter hole at equiangular intervals, extend longitudinally from the outer end, and communicate with the cutter hole. Each external slit has an outer opening formed in the outer surface, an end opening formed on the outer end, an inner opening communicating with the cutter hole, an inner edge adjacent to the cutter hole and opposite the outer end of the collet body, and an outer edge on the outer surface and opposite the outer end of the collet body. An extension length of each external slit is shorter than the longitudinal length of the collet body. The internal slits are defined radially in the collet body, are arranged around the cutter hole at equiangular intervals, extend longitudinally from the inner end, communicate with the cutter hole, and are in a staggered arrangement with the external slits. Each internal slit has an outer opening formed in the outer surface, an end opening formed on the inner end, and an inner opening communicating with the cutter hole. An extension length of each internal slit is shorter than a distance from the inner end to the annular groove. A width of each internal slit is larger than the width of each external slit. The coolant channels are defined longitudinally in the collet body around the cutter hole, converged radially toward the outer end. Each coolant channel has a hole axis, an end communicating with a respective one of the internal slits, and an opening formed in the outer end. An angle between the hole axis and the center axis is greater than 0 degree and less than or equal to 12 degrees.
- The cutter has a mounting end and a cutting end, and is inserted in the cutter hole of the collet body from the mounting end and protruding from the outer end of the collet body, wherein a distance from the outer end of the collet body to the cutting end of the cutter is four times of the diameter of the cutter.
- Other objects, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
-
FIG. 1 is a perspective view of a first embodiment of a collet body of a collet assembly in accordance with the present invention; -
FIG. 2 is another perspective view of the collet body of the collet assembly inFIG. 1 ; -
FIG. 3 is a cross sectional side view of the collet assembly in accordance with the present invention; -
FIG. 4 is another cross sectional side view of the collet assembly inFIG. 3 ; -
FIG. 5 is an end side view of the collet body of the collet assembly inFIG. 1 ; -
FIG. 6 is an operational cross sectional side view of the collet assembly inFIG. 3 assembled on a cutter holder; -
FIG. 7 is an operational cross sectional side view of the cutter holder with the collet assembly inFIG. 6 ; -
FIG. 8 is a perspective view in partial section of a second embodiment of a collet assembly in accordance with the present invention; and -
FIG. 9 is an operational cross sectional side view of a third embodiment of a collet assembly in accordance with the present invention. - With reference to
FIGS. 1 to 5 , a collet assembly in accordance with the present invention comprises acollet body 10 and acutter 20. - The
collet body 10 has a center axis X, anouter end 11, aninner end 12, an outer surface, anannular groove 13, acutter hole 14, eightexternal slits 15, eightinternal slits 16, and fourcoolant channels 17. - The
outer end 11 and theinner end 12 are opposite each other. Theannular groove 13 is defined around and recessed in the outer surface and is located near theouter end 11. Thecollet body 10 is formed as a bicone, and a diameter of thecollet body 10 where theannular groove 13 is formed is larger than a diameter of theouter end 11 and a diameter of theinner end 12. Thecutter hole 14 is defined axially in thecollet body 10 along the center axis X. - The
external slits 15 are defined radially in thecollet body 10, are arranged around thecutter hole 14 at equiangular intervals, extend longitudinally from theouter end 11, and communicate with thecutter hole 14. Eachexternal slit 15 has an outer opening formed in the outer surface of thecollet body 10, an end opening formed on theouter end 11, an inner opening communicating with thecutter hole 14, aninner edge 151 adjacent to thecutter hole 14 and opposite theouter end 11, and anouter edge 152 on the outer surface of thecollet body 10 and opposite theouter end 11. Anextension length 15L of eachexternal slit 15 is shorter than thelongitudinal length 10L of thecollet body 10, and a distance from theouter end 11 to theinner edge 151 of eachexternal slit 15 is shorter than a distance from theouter end 11 to theouter edge 152 of eachexternal slit 15. - The
internal slits 16 are defined radially in thecollet body 10, are arranged around thecutter hole 14 at equiangular intervals, are in a staggered arrangement with theexternal slits 15 at equiangular intervals, extend longitudinally from theinner end 12, and communicate with thecutter hole 14. Eachinternal slit 16 has an outer opening formed in the outer surface of thecollet body 10, an end opening formed on theinner end 12, an inner opening communicating with thecutter hole 14, and aninner edge 161 adjacent to thecutter hole 14 and opposite theinner end 12. Anextension length 16L of eachinternal slit 16 is shorter than a distance from theinner end 12 to theannular groove 13. A width C of eachinternal slit 16 is larger than a width E of eachexternal slit 15. A distance from theinner end 12 to theinner edge 161 of eachinternal slit 16 is larger than a distance from theinner end 12 to theinner edge 151 of eachexternal slit 15, and eachexternal slit 15 and eachinternal slit 16 have an overlapping segment M defined on the surface of thecutter hole 14 from a position on theinner edge 161 of eachinternal slit 16 to a corresponding position on theinner edge 151 of eachexternal slit 15. - The
coolant channels 17 are defined longitudinally in thecollet body 10, are arranged around thecutter hole 14, and are converged radially toward theouter end 11. - Each
coolant channel 17 has a hole axis A, an end communicating with a respective one of theinternal slits 16, and an opening formed in theouter end 11. An angle θ between the hole axis A of eachcoolant channel 17 and center axis X is greater than 0 degree and less than or equal to 12 degrees, and the hole axis A of eachcoolant channel 17 and the center axis X intersect with each other in a position outside of thecollet body 10 opposite theinner end 12 and away from theouter end 11. - The
cutter 20 is a cutter without coolant channels, has a mounting end and a cutting end, is inserted in thecutter hole 14 from the mounting end, and protrudes from theouter end 11 of thecollet body 10. A distance L from the cutting end of thecutter 20 to theouter end 11 of thecollet body 10 is four times of the diameter D of thecutter 20. - The amounts of the external slits 15and the
internal slits 16 may each be eight, and the amounts of thecoolant channels 17 may be four as shown inFIG. 1 , or thecollet body 10A may have sixexternal slits 15A, sixinternal slits 16A and threecoolant channels 17A as shown inFIG. 8 . - With reference to
FIG. 6 , when mounting the collet assembly in accordance with the present invention into acutter holder 30, thecollet body 10 is inserted into aconical recess 31 of thecutter holder 30 from theinner end 12. Anut 40 is mounted around thecollet body 10 with the engagement between an inner flange of thenut 40 and theannular groove 13 of thecollet body 10. Thecutter 20 is inserted in thecutter hole 14 of thecollet body 10 from the mounting end. Then, thenut 40 is screwed with thecutter holder 30 to push thecollet body 10 into theconical recess 31 of thecutter holder 30 to contract theexternal slits 15, theinternal slits 16 and thecutter hole 14 of thecollet body 10 to clamp thecutter 20 at a desired assembly position tightly. - Because the width C of each
internal slit 16 is larger than the width E of eachexternal slit 15, thecollet body 10 has a better flexible deformation on the inner portion of thecollet body 10 near theinner end 12 than on the outer portion of thecollet body 10 near theouter end 11. Besides, eachexternal slit 15 and eachinternal slit 16 have the overlapping segment M formed in the surface of thecutter hole 14, thecollet body 10 may provide a steady clamping force to clamp thecutter 20 by contractions of theexternal slits 15 and theinternal slits 16. Because the distance L from the cutting end of thecutter 20 to theouter end 11 of thecollet body 10 is equal to four times of the diameter D of thecutter 20, the clamping force and the clamping stability of thecollet body 10, and the cutting efficiency and the cutting precision of thecutter 20 can be optimally balanced. - With reference to
FIG. 7 , when the coolant from the center coolant system flows into thecutter holder 30, the coolant will flow in theinternal slits 16 and thecutter hole 14 of thecollet body 10 from theinner end 12. Because the outer openings of theinternal slits 16 formed in the outer surface of thecollet body 10 is closed by theconical recess 31 of thecutter holder 30 and thecutter hole 14 is blocked by thecutter 20, the coolant will flow through thecoolant channels 17, and will be guided to and converged to the heating point of the workingcutter 20 with the arrangement of thecoolant channels 17 converged toward theouter end 11. - Because the distance L from the cutting end of the
cutter 20 to theouter end 11 is four times of the diameter D of thecutter 20, the length of the distance L depends on the length of the diameter D of thecutter 20. To lead the coolant converged to and cooling the heating point of the workingcutter 20, the angle θ between the center axis X and the hole axis A of eachcoolant channel 17 corresponds to the distance L, and when the diameter D of thecutter 20 is larger, the angle θ between the center axis X and the hole axis of eachcoolant channel 17 will be smaller. The preferred range of the angle θ is greater than 0 degree and less than or equal to 12 degrees, whereby a good cooling effect for cooling thecutter 20 can be provided. Moreover, the distance from theouter end 11 to theinner edge 151 of eachexternal slit 15 is shorter than the distance from theouter end 11 to theouter edge 152 of eachexternal slit 15, and the inner openings of theexternal slits 15 communicating with thecutter hole 14 may be closed by thecutter 20 inserted in thecutter hole 14. So the coolant will not be diverted to theexternal slits 15, and will be concentrated to thecoolant channels 17 to provide an optimal cooling efficiency for cooling thecutter 20. - With reference to
FIG. 9 , a third embodiment of the collet assembly in accordance with the present invention is assembled on acutter holder 30. Multiple plugs 19 are respectively detachably mounted in thecoolant channels 17B and close the openings of thecoolant channels 17B on theouter end 11B of thecollet body 10B. - The
plugs 19 may be rubber plugs, bolts, and so on. In the third embodiment, acutter 20A havingcoolant holes 21A defined therethrough may be inserted in the cutter hole of thecollet body 10B and a distance from theouter end 11B of thecollet body 10B to the mounting end of thecutter 20A is larger than a distance from theouter end 11B of thecollet body 10B to the inner edge of each external slit of thecollet body 10B. - Because the openings of the
coolant channels 17B are closed by theplugs 19 and the inner openings of the external slits are closed by thecutter 20A, the coolant may be concentrated to the coolant holes 21 of thecutter 20A to provide an optimal cooling efficiency for cooling thecutter 20A. When acutter 20 without coolant holes is inserted in the cutter holes of thecollet body 10B, theplugs 19 may be detached from thecoolant channels 17B of thecollet body 10B and the coolant may flow out from thecoolant channels 17B to cool thecutter 20. - Even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and function of the invention, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
Claims (11)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US16/131,528 US10576551B1 (en) | 2018-09-14 | 2018-09-14 | Coolant collet assembly |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US16/131,528 US10576551B1 (en) | 2018-09-14 | 2018-09-14 | Coolant collet assembly |
Publications (2)
Publication Number | Publication Date |
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US10576551B1 US10576551B1 (en) | 2020-03-03 |
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US11207728B2 (en) * | 2020-02-19 | 2021-12-28 | Newfrey Llc | Self-piercing rivet fastening device |
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CN111347088B (en) * | 2020-03-18 | 2021-08-20 | 东莞市闻誉实业有限公司 | Drill bit structure and drilling equipment |
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IL85515A (en) * | 1988-02-19 | 1992-12-01 | Etm Eng Tool Mfg Co Ltd | Spring collets |
JPH0627046U (en) * | 1992-09-10 | 1994-04-12 | 株式会社日研工作所 | Fluid supply device for tools |
JP3321678B2 (en) * | 1993-03-30 | 2002-09-03 | エヌティーツール株式会社 | Collet for refueling |
US5405155A (en) * | 1993-05-27 | 1995-04-11 | Power Tool Holders, Inc. | Sealing collet |
JPH08503170A (en) * | 1993-09-14 | 1996-04-09 | レゴ−フィックス・アクチェン・ゲゼルシャフト | Tool clamping device |
JP3718271B2 (en) * | 1995-12-28 | 2005-11-24 | 大昭和精機株式会社 | Collet |
US7785046B2 (en) * | 2002-07-17 | 2010-08-31 | Advanced Industries | Tool coolant application and direction assembly |
TWM285418U (en) * | 2005-06-20 | 2006-01-11 | Syntec Machinery Co Ltd | Cylinder clip for cutting tools with water preventing structure |
IL204981A (en) * | 2010-04-11 | 2014-06-30 | Iscar Ltd | Collet |
US20130230361A1 (en) * | 2012-03-03 | 2013-09-05 | Techniks, Inc. | Rotational locking collet machine tool holder |
US9022393B2 (en) * | 2012-08-23 | 2015-05-05 | Iscar, Ltd. | Cutting tool lock nut having grooved collet-locking surface and cutting tool incorporating same |
US10160042B2 (en) * | 2014-04-04 | 2018-12-25 | Kennametal Inc. | Reducer sleeve with thru coolant flow and a cutting assembly using such reducer sleeve |
US10399150B2 (en) * | 2017-06-05 | 2019-09-03 | Kennametal Inc. | Sealed collet |
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US11207728B2 (en) * | 2020-02-19 | 2021-12-28 | Newfrey Llc | Self-piercing rivet fastening device |
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