WO2023037427A1 - コレットチャック - Google Patents

コレットチャック Download PDF

Info

Publication number
WO2023037427A1
WO2023037427A1 PCT/JP2021/032943 JP2021032943W WO2023037427A1 WO 2023037427 A1 WO2023037427 A1 WO 2023037427A1 JP 2021032943 W JP2021032943 W JP 2021032943W WO 2023037427 A1 WO2023037427 A1 WO 2023037427A1
Authority
WO
WIPO (PCT)
Prior art keywords
collet
chuck
mandrel
tapered surface
claws
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.)
Ceased
Application number
PCT/JP2021/032943
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
木村敏隆
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fuji Corp
Original Assignee
Fuji Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fuji Corp filed Critical Fuji Corp
Priority to PCT/JP2021/032943 priority Critical patent/WO2023037427A1/ja
Priority to JP2023546608A priority patent/JP7744426B2/ja
Priority to US18/294,396 priority patent/US20240286204A1/en
Priority to DE112021008201.9T priority patent/DE112021008201B4/de
Publication of WO2023037427A1 publication Critical patent/WO2023037427A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • B23B31/207—Characterized by features relating primarily to remote control of the gripping means using mechanical transmission through the spindle
    • 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
    • B23B31/19—Chucks with simultaneously-acting jaws, whether or not also individually adjustable moving parallel to the axis of the chuck
    • 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
    • B23B31/40—Expansion mandrels
    • B23B31/4006—Gripping the work or tool by a split sleeve
    • B23B31/4033—Gripping the work or tool by a split sleeve using mechanical transmission through the spindle
    • 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
    • Y10T279/10—Expanding
    • Y10T279/1004—Collet type
    • Y10T279/1008—Fixed jaws and moving cam

Definitions

  • the present invention relates to a collet chuck that prevents workpieces from being pulled in.
  • a machine tool that processes a workpiece uses a chuck device to hold the workpiece.
  • a collet chuck in which a mandrel is inserted into a collet radially cut from the center is used as a chuck device for gripping an inner diameter hole of a work.
  • relative axial movement of the mandrel and collet radially expands and contracts the chuck claws of the collet by both tapered surfaces that are in sliding contact with each other.
  • Patent Document 1 below discloses a type of collet chuck that moves the mandrel side in the axial direction.
  • the cylindrical collet has six radial slits and six expandable/contractible chuck claws formed in the circumferential direction.
  • collet chucks include a retractable collet chuck that retracts the collet side. While retracting the workpiece, the tapered surface of the mandrel spreads the chuck claws to clamp the workpiece.
  • the collet retracts while pressing the chuck claws against the workpiece. Therefore, in the case of a work having a relatively thin wall thickness, the work is pulled together during clamping, thereby causing the work to be distorted.
  • the fixed collet chuck moves the mandrel instead of the collet, so that the workpiece can be clamped without being pulled in.
  • the fixed collet chuck is formed such that the outer taper of the mandrel increases in diameter toward the tip. Therefore, when the collet is pulled out from the collet chuck main body, the outer taper of the mandrel is caught, and the structure is not such that the parts can be replaced easily.
  • the mandrel located in the center moves, there is a drawback that the accuracy of centering is inferior to that of the pull-in type collet chuck in which the mandrel is fixed.
  • an object of the present invention is to provide a collet chuck with a double collet in order to solve such problems.
  • a collet chuck includes a mandrel fixed at a central position with a frusto-conical outer tapered surface formed at the tip, and a cylindrical collet main body located outside the mandrel and extending in the circumferential direction.
  • the divided intermediate claws formed at the respective distal end portions are composed of a first collet having an inner tapered surface formed on the inner side and slidably contacting the outer tapered surface of the mandrel, and positioned outside the first collet and having a cylindrical shape.
  • the collet main body is divided in the circumferential direction, and an inner sliding contact surface formed on the inner side of the chuck claw formed at each end portion of the chuck claw is in sliding contact with an outer sliding contact surface formed on the outer side of the intermediate claw, It has a second collet in which a chuck surface formed on the outside of the chuck claw abuts against the work, and a collet supporting member that receives an axial force and supports the first collet so that it can move in the axial direction.
  • the collet support member when the collet support member receives an axial force to move the first collet in the axial direction, the intermediate portion formed in the first collet is pushed against the outer tapered surface of the mandrel fixed at the central position. Since the inner tapered surface of the jaw slides and the intermediate jaw expands in the radial direction depending on the taper angle, the inner sliding contact surface of the chuck jaw is in sliding contact with the outer sliding contact surface of the intermediate jaw. are pushed outward to expand and clamp the workpiece without moving it axially.
  • FIG. 4 is a cross-sectional view showing one embodiment of a collet chuck
  • FIG. 4 is a simple cross-sectional view showing a state of the chuck mechanism when it is unclamped.
  • FIG. 4 is a simple cross-sectional view showing a clamping state of the chuck mechanism;
  • FIG. 1 is a cross-sectional view showing the collet chuck of this embodiment.
  • This collet chuck 1 is mounted on a rotating spindle 80 to constitute a spindle device of a machine tool. Therefore, the centerline O of the collet chuck overlaps the axis of rotation of the spindle 80 .
  • a base block 3 is axially superimposed on the end of a spindle 80 and fixed with screws, and a main body block 4 is axially superimposed on the base block 3 and fixed with screws.
  • a double collet chuck mechanism is assembled to the main body block 4 .
  • the collet chuck 1 has a cylindrical mandrel 5 fixed at its center, a first collet 6 movable in the axial direction provided outside thereof, and a fixed second collet 7 arranged outside thereof. ing.
  • the spindle 80 of the main shaft device is rotatably assembled via bearings and configured to rotate upon receiving the output of a servomotor.
  • a drawbar 81 is inserted into the axial center hole of the hollow shaft spindle 80 and connected to the piston rod of the hydraulic cylinder arranged coaxially.
  • the collet chuck 1 incorporates an operating rod 11 at a central position coaxial with the mandrel 5 and is connected to the draw bar 81 . Therefore, the collet chuck 1 is configured such that the operation rod 11 is axially displaced by the operation of the hydraulic cylinder.
  • the left side of the drawing of the collet chuck 1 is the rear side, and the same direction is the retraction direction of the operating rod 11 by the hydraulic cylinder.
  • the operating rod 11 is inserted into the cylindrical retracting member 12, and the radially projecting flange portion 111 is brought into contact with the stepped portion 121 formed inside the retracting member 12 from the front side. Therefore, the retracting member 12 is retracted rearward through the flange portion 111 hooked on the stepped portion 121 as the operating rod 11 moves rearward.
  • the retracting member 12 is biased forward by a spring 15 and configured to be displaced forward as the operating rod 11 moves forward.
  • a cylindrical holding member 16 is provided between the base block 3 and the spindle 80 so that the flange portions are engaged.
  • the holding member 16 slidably holds the pull-in member 12 and the draw bar 81 and is fixed to the base block 3 by screwing. Accordingly, a collet support member is formed in a hollow portion formed in the spindle 80, the base block 3 and the main body block 4 to move the pull-in member 12 in the front-rear direction via the operation rod 11 connected to the draw bar 81. .
  • the drawing member 12 is formed with a connection portion 123 that axially connects with the first collet 6 on the radially outer side of the stepped portion 121 .
  • a plurality of connecting portions 123 are formed at equal intervals on the circumference, pass through through holes formed in the flange portion 51 of the mandrel 5, and are fixed to the flange portion 61 of the first collet 6 by screwing.
  • the mandrel 5 is screwed and fixed to the main block 4 at a flange portion 51 formed at the rear end portion.
  • the first collet 6 has a plurality of radial slits formed in a cylindrical collet body, and an intermediate claw 63 is formed at each end of the collet body divided in the circumferential direction by the slits.
  • the tip of the mandrel 5 is formed with a truncated cone-shaped outer tapered surface 55 whose diameter decreases toward the front side, and the intermediate claw 63 of the first collet 6 contacts the tip of the mandrel 5 with the tapered surfaces. ing.
  • An inner tapered surface 65 matching the angle of the outer tapered surface 55 is formed on the inner side of the intermediate claw 63 so that it slides on the outer tapered surface 55 in a contact state as shown in the figure.
  • the intermediate claw 63 of the first collet 6 has an inner tapered surface that is inclined when viewed in the axial direction, and an outer sliding contact surface 67 that is parallel to the center line O is formed on the opposite outer side.
  • the flange portion 71 of the second collet 7 arranged outside the first collet 6 is fixed to the main body block 4 by screwing.
  • the second collet 7 has a plurality of slits formed in a cylindrical collet main body portion at intervals equal to those of the first collet 6, and chuck claws 73 are formed at the distal end portions of the collet main body divided in the circumferential direction by the slits. ing.
  • the chuck claw 73 has an inner sliding contact surface 75 parallel to the center line O so that the outer sliding contact surface 67 of the intermediate claw 63 and the inner sliding contact surface 75 are in contact with each other.
  • a chuck surface 77 parallel to the center line O is formed so that it can be applied.
  • a seat block 8 is screwed and fixed to the flange portion 71 of the second collet 7 .
  • FIG. 2 and 3 are simplified cross-sectional views showing the chuck mechanism of the collet chuck 1.
  • FIG. 2 shows the state during unclamping
  • FIG. 3 shows the state during clamping. It is The action of the collet chuck 1 will be described below with reference to FIG.
  • the collet chuck 1 clamps and unclamps the workpiece W by operating a hydraulic cylinder that operates the draw bar 81 . Normally, the draw bar 81 is in the forward position, and the collet chuck 1 is in the unclamped state shown in FIG.
  • a workpiece W is attached to such a collet chuck 1.
  • the workpiece W is a thin flanged cylindrical part, the cylindrical portion of which is fitted into the chuck claws 73 of the second collet 7 and the flange portion of which is abutted against the seating surface of the seating block 8 .
  • a hydraulic cylinder is operated in the work clamp, and the operation rod 11 integrated with the drawbar 81 is pulled rearward.
  • the operating rod 11 draws in the retracting member 12 with the urging force of the spring 15 via the flange portion 111 hooked on the stepped portion 121 . Therefore, the first collet 6 connected to the retracting member 12 moves backward by a certain distance.
  • the drawn-in first collet 6 moves rearward as indicated by the arrow in FIG. do. Since the chuck claws 73 of the second collet 7 are in contact with the intermediate claws 63 on the outer side, the intermediate claws 63 slide on the outer tapered surface 55 of the mandrel 5, and the chuck claws 73 move as indicated by the white arrows. It is displaced so as to be pushed outward. The workpiece W is clamped so as to be gripped from the inside by the chuck claws 73 whose cylindrical portion is expanded.
  • the collet chuck 1 of the present embodiment has a chuck mechanism with a double collet of the first collet 6 and the second collet 7, the second collet 7 in contact with the work W does not move in the axial direction. It is possible to prevent the work W from being pulled in when clamping. Since the workpiece W is no longer drawn in, even a relatively thin workpiece is not distorted by clamping, and the problem of lowering the machining accuracy of the machine tool can be resolved.
  • the collet chuck 1 of this embodiment has high centering accuracy because the intermediate claws 63 and the chuck claws 73 are displaced according to the outer tapered surface 55 of the mandrel 5 fixed at the center position, and are coaxial with the center line O of the work W. Accurate clamping can be performed.
  • the distal end portion of the mandrel 5 formed with the outer tapered surface 55 has a truncated cone shape whose diameter decreases toward the front side. is easy to remove.
  • the collet chuck 1 of the above embodiment has a structure in which the first collet 6 is clamped by pulling it in, but the structure is such that it is clamped by pushing out while changing the angles of the outer tapered surface 55 and the inner tapered surface 65 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gripping On Spindles (AREA)
PCT/JP2021/032943 2021-09-08 2021-09-08 コレットチャック Ceased WO2023037427A1 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
PCT/JP2021/032943 WO2023037427A1 (ja) 2021-09-08 2021-09-08 コレットチャック
JP2023546608A JP7744426B2 (ja) 2021-09-08 2021-09-08 コレットチャック
US18/294,396 US20240286204A1 (en) 2021-09-08 2021-09-08 Collet chuck
DE112021008201.9T DE112021008201B4 (de) 2021-09-08 2021-09-08 Spannzangenfutter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2021/032943 WO2023037427A1 (ja) 2021-09-08 2021-09-08 コレットチャック

Publications (1)

Publication Number Publication Date
WO2023037427A1 true WO2023037427A1 (ja) 2023-03-16

Family

ID=85507319

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2021/032943 Ceased WO2023037427A1 (ja) 2021-09-08 2021-09-08 コレットチャック

Country Status (4)

Country Link
US (1) US20240286204A1 (https=)
JP (1) JP7744426B2 (https=)
DE (1) DE112021008201B4 (https=)
WO (1) WO2023037427A1 (https=)

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60161505U (ja) * 1984-04-06 1985-10-26 トヨタ自動車株式会社 ダブルチヤツク
JPS6242907U (https=) * 1985-08-30 1987-03-14
JPH01132313U (https=) * 1988-03-04 1989-09-08
JPH1034411A (ja) * 1996-07-23 1998-02-10 Toyota Motor Corp コレットチャック
JPH11188514A (ja) * 1997-12-25 1999-07-13 Howa Mach Ltd チャック
JP2007271045A (ja) * 2006-03-31 2007-10-18 Jtekt Corp 車輪用転がり軸受装置の製造方法
JP4990693B2 (ja) * 2007-06-22 2012-08-01 有限会社大谷鉄工所 チャック用コレットの割溝構造
EP2811190A1 (en) * 2013-06-04 2014-12-10 Aktiebolaget SKF Apparatus for machining a bearing ring
JP2017217744A (ja) * 2016-06-10 2017-12-14 豊和工業株式会社 コレットチャック
JP2019084635A (ja) * 2017-11-08 2019-06-06 株式会社Ｆｕｊｉ チャック装置
JP2020019101A (ja) * 2018-08-01 2020-02-06 株式会社 神崎高級工機製作所 ワーク治具及びこれを備えたワーク支持システム

Family Cites Families (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2789825A (en) * 1954-10-06 1957-04-23 Charles E Drew Expanding mandrel chuck
US3420537A (en) * 1965-10-22 1969-01-07 Gleason Works Workholder and expansible collet therefor
US3490778A (en) * 1967-09-12 1970-01-20 John J Parker Collet chuck
JPS5314453Y2 (https=) * 1973-06-15 1978-04-17
US3909021A (en) * 1974-01-14 1975-09-30 Mp Tool & Engineering Co Collet chuck
US4121847A (en) * 1977-10-28 1978-10-24 Morawski London T Collet chuck
US4201394A (en) * 1978-12-01 1980-05-06 Morawski London T Collet chuck
US4416459A (en) * 1981-06-03 1983-11-22 Morawski Longine V Collet chuck for splined workpieces
DE4004819C1 (https=) * 1990-02-16 1991-08-08 Claus 7120 Bietigheim-Bissingen De Schmidt
JP2740939B2 (ja) * 1994-07-01 1998-04-15 合資会社日下歯車製作所 内径コレットチャック
US5816581A (en) * 1997-02-20 1998-10-06 Chase; R. Lee ID chuck providing workpiece registration and operable by push or pull to attach a workpiece
AU2003208589A1 (en) * 2002-02-20 2003-09-09 Rami Siev Internal surface chucking mechanism and method
JP2007260861A (ja) * 2006-03-29 2007-10-11 Toyota Motor Corp コレットチャック装置
WO2011059945A1 (en) * 2009-11-10 2011-05-19 The Gleason Works Compensating workholding equipment
KR20130133960A (ko) * 2012-05-30 2013-12-10 김진복 스핀들용 이중 콜릿 척
JP6600194B2 (ja) * 2015-08-26 2019-10-30 株式会社Ｆｕｊｉ チャック装置
CN105252023B (zh) * 2015-11-23 2017-11-24 重庆欧博特智能机器人科技有限公司 一种机床主轴
KR101966196B1 (ko) * 2016-04-28 2019-04-08 셰플러코리아(유) 베어링 궤도륜 가공 척킹 시스템
DE102017116617B4 (de) * 2017-07-24 2020-08-13 Schunk Gmbh & Co. Kg Spann- Und Greiftechnik Spannzangenfutter
CN207770877U (zh) * 2017-12-20 2018-08-28 香河凯华齿轮有限公司 弹性涨套夹具结构
CN109570544A (zh) * 2019-01-30 2019-04-05 吉林北方捷凯传动轴有限公司 传动轴内环涨夹装置

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60161505U (ja) * 1984-04-06 1985-10-26 トヨタ自動車株式会社 ダブルチヤツク
JPS6242907U (https=) * 1985-08-30 1987-03-14
JPH01132313U (https=) * 1988-03-04 1989-09-08
JPH1034411A (ja) * 1996-07-23 1998-02-10 Toyota Motor Corp コレットチャック
JPH11188514A (ja) * 1997-12-25 1999-07-13 Howa Mach Ltd チャック
JP2007271045A (ja) * 2006-03-31 2007-10-18 Jtekt Corp 車輪用転がり軸受装置の製造方法
JP4990693B2 (ja) * 2007-06-22 2012-08-01 有限会社大谷鉄工所 チャック用コレットの割溝構造
EP2811190A1 (en) * 2013-06-04 2014-12-10 Aktiebolaget SKF Apparatus for machining a bearing ring
JP2017217744A (ja) * 2016-06-10 2017-12-14 豊和工業株式会社 コレットチャック
JP2019084635A (ja) * 2017-11-08 2019-06-06 株式会社Ｆｕｊｉ チャック装置
JP2020019101A (ja) * 2018-08-01 2020-02-06 株式会社 神崎高級工機製作所 ワーク治具及びこれを備えたワーク支持システム

Also Published As

Publication number Publication date
US20240286204A1 (en) 2024-08-29
DE112021008201T5 (de) 2024-07-11
DE112021008201B4 (de) 2026-03-19
JP7744426B2 (ja) 2025-09-25
JPWO2023037427A1 (https=) 2023-03-16

Similar Documents

Publication Publication Date Title
CN203779182U (zh) 用于薄壁套筒的定心夹具
US10646929B2 (en) Clamping device and machining unit comprising such a clamping device
CN104858694A (zh) 薄壁零件自定心夹具
JPH05200611A (ja) チャック
US4201394A (en) Collet chuck
US4208061A (en) Chuck with retractable stop
JP6766457B2 (ja) コレットチャック
KR102496859B1 (ko) 콜렛척
JP7744426B2 (ja) コレットチャック
JP4393214B2 (ja) チャック装置
KR20200108998A (ko) 척킹력 조정 기능을 갖춘 선반의 주축대
US8348282B2 (en) Tool clamping device and tool clamping method
US6290241B1 (en) Fixed-length collet chuck assembly
US3718339A (en) Workpiece stop assembly for contracting collet chucks
JP2019084635A (ja) チャック装置
JP6832080B2 (ja) フェースクランプチャック装置
CN212019425U (zh) 一种保持架加工用夹具
JP2001322014A (ja) 棒材把持装置及び自動旋盤
JP3092885B2 (ja) 内径無段取クランプ治具
JP7833983B2 (ja) ブレード付き内径コレットチャック
US6637307B2 (en) Method for machining a workpiece and chuck with a center pin for implementing it
JP4522108B2 (ja) コレットチャック装置
JP2005118948A (ja) 内張りチャック
JP4437585B2 (ja) 主軸移動型自動旋盤のガイドブッシュ内径調整装置
JP2533563Y2 (ja) 進退動作可能なワーク支持手段を有するワーク支持装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 21956724

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 2023546608

Country of ref document: JP

WWE Wipo information: entry into national phase

Ref document number: 18294396

Country of ref document: US

WWE Wipo information: entry into national phase

Ref document number: 112021008201

Country of ref document: DE

122 Ep: pct application non-entry in european phase

Ref document number: 21956724

Country of ref document: EP

Kind code of ref document: A1

WWG Wipo information: grant in national office

Ref document number: 112021008201

Country of ref document: DE