EP0584907A2 - Dispositif pour le forgeage d'une roue à denture hélicoidale - Google Patents

Dispositif pour le forgeage d'une roue à denture hélicoidale Download PDF

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Publication number
EP0584907A2
EP0584907A2 EP93304657A EP93304657A EP0584907A2 EP 0584907 A2 EP0584907 A2 EP 0584907A2 EP 93304657 A EP93304657 A EP 93304657A EP 93304657 A EP93304657 A EP 93304657A EP 0584907 A2 EP0584907 A2 EP 0584907A2
Authority
EP
European Patent Office
Prior art keywords
helical
cavity
tooth
truncated cone
punches
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.)
Withdrawn
Application number
EP93304657A
Other languages
German (de)
English (en)
Other versions
EP0584907A3 (en
Inventor
Tetsuya Hoguchi
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.)
O Oka Forge Co Ltd
Original Assignee
O Oka Forge Co Ltd
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 O Oka Forge Co Ltd filed Critical O Oka Forge Co Ltd
Publication of EP0584907A2 publication Critical patent/EP0584907A2/fr
Publication of EP0584907A3 publication Critical patent/EP0584907A3/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H5/00—Making gear wheels, racks, spline shafts or worms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/28—Making machine elements wheels; discs
    • B21K1/30—Making machine elements wheels; discs with gear-teeth
    • B21K1/305—Making machine elements wheels; discs with gear-teeth helical
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/28—Making machine elements wheels; discs
    • B21K1/30—Making machine elements wheels; discs with gear-teeth

Definitions

  • the present invention relates to a device for forging a helical gear by plastic working means, to a method of making a helical gear.
  • helical gears to be manufactured by forging in place of conventional machining.
  • a typical example of forged helical gears is disclosed in Japanese Patent Laying-Open Gazette No. 64-22442, wherein helical teeth are formed on a circumference of a work while the work is pressed by a punch into a die.
  • a plurality of helical-tooth punches for forming helical teeth are arranged to be movable in radial direction in the same manner as straight teeth formation means as shown in Fig. 10.
  • a plurality of straight-tooth punches 7a,7a (shown by the solid lines in Fig. 10) form straight teeth which are disposed in parallel with a central axis of a gear body.
  • Flat sliding faces of the plurality of straight-tooth punches 7a,7a respectively correspond to and engage with flat cam faces of a plurality of extrusion cams 8a,8a (shown by the one-dot broken lines in Fig. 10) which are movable along the central axis.
  • a plurality of helical-tooth punches 7,7 form helical teeth which are inclined to the central axis of the gear body.
  • Each flat sliding face of the helical-tooth punches 7,7 does not preferably correspond to or engage with each flat cam face of the extrusion cams 8a,8a due to interference of an adjacent extrusion cam 8a.
  • the sliding faces of the helical-tooth punches can theoretically be arranged in parallel with the central axis of the gear by distorting the helical-tooth punches by respective required angles. This method is, however, not practical because of insufficient pressure resistance of the forged helical teeth. Namely, there is no practical method of mass producing helical gears with high precision by plastic working means.
  • One object of the invention is to provide a novel device for forging a helical gear by plastic working means.
  • Another object of the invention is to provide a helical gear forging device including a die which is free from a rotation relative to a workpiece.
  • the above and other related objects are realized by a device for forging a helical gear.
  • the device includes: a die having a cylindrical cavity formed on the center thereof for receiving a work; a punch assembly disposed above the cavity and movable in a vertical direction; and a plurality of helical-tooth punches for forming rough profiles of helical teeth around the work set in the cavity.
  • the plurality of helical-tooth punches are mounted on a circumference of the cylindrical cavity and movable in a radial direction towards a center of the cavity.
  • the device further includes an extrusion cam disposed above the plurality of helical-tooth punches and movable in the vertical direction.
  • the extrusion cam has a bottom inner surface formed as a cam face constituting a side face of a first truncated cone having predetermined first dimensions and a slope.
  • the plurality of helical-tooth punches respectively have sliding faces which are arranged to integrally form a side face of a second truncated cone and engage with the cam face of the extrusion cam.
  • the second truncated cone has predetermined second dimensions and a slope identical with or corresponding to those of the first truncated cone, and thereby perfectly fits in the first truncated cone.
  • the cam face of the extrusion cam fittingly engages with and presses against the sliding faces of the helical-tooth punches to move the helical-tooth punches in the radial direction towards the center of the cavity to form rough profiles of helical teeth around a side wall of a work set in the cavity.
  • the punch assembly is then pressed down to finish the helical teeth roughly formed on the side wall of the work.
  • the above structure of the invention allows the truncated cone-shaped cam face of the extrusion cam to effectively press the sliding faces of the helical-tooth punches in the radial direction towards the center of the cavity.
  • Each helical-tooth punch is partly overlapped with adjacent helical-tooth punches. Since the second truncated cone formed by integrating the sliding faces of the helical-tooth punches perfectly fits in the first truncated cone of the cam face of the extrusion cam, the cam face sufficiently presses all the partly overlapped helical-tooth punches in the radial direction to form rough profiles of helical teeth around a work.
  • a helical gear forming device of the embodiment includes a die 1, a punch assembly 3, and an ejector 5.
  • the die 1 includes a disk-shaped cavity 2 formed on its center.
  • the punch assembly 3 is located immediately above the die 1 to be movable in a vertical direction between an upper position and a lower position for pressing a work 4 down into the cavity 2.
  • the work 4 has a larger-diametral element and a smaller-diametral element.
  • the cavity 2 includes a smaller-diametral portion having a straight teeth forging element 6 arranged on a circumference thereof for forming straight teeth on the smaller-diametral element of the work 4, and a larger-diametral portion having a plurality of helical-tooth punches 7,7 mounted on a circumference thereof for forming rough profiles of helical teeth on the larger-diametral element of the work 4.
  • the helical-tooth punches 7,7 are supported on the larger-diametral portion of the cavity 2 to be freely movable in a radial direction between a first radial position and a second radial position.
  • the larger-diametral portion of the cavity 2 also has a helical teeth forging element consisting of a plurality of grooves 9,9 for forming helical teeth around the larger-diametral element of the work 4, in combination with the plurality of helical-tooth punches 7,7.
  • the extrusion cam 8 goes down to the second vertical position to press the helical-tooth punches 7,7 towards the center of the cavity 2 to the second radial position.
  • Each helical-tooth punch 7 is provided with a spring 12 for returning the helical-tooth punch 7, which is pressed to the second radial position by the extrusion cam 8, to the first radial position.
  • the cylindrical extrusion cam 8 concentrically arranged with the punch assembly 3 has an inner bottom surface formed as a cam face constituting a side face of a first truncated cone having predetermined first dimensions and slope.
  • the helical-tooth punches 7,7 respectively have sliding faces which are arranged to integrally form a side face of a second truncated cone and engage with the cam face of the extrusion cam 8 as clearly seen in Fig. 2.
  • each helical-tooth punch 7 is a curved surface constituting part of the second truncated cone.
  • the second truncated cone has predetermine second dimensions and a slope identical with or corresponding to those of the first truncated cone. and thereby perfectly fits in the first truncated cone. This structure allows any part of the circular cam face of the cylindrical extrusion cam 8 to sufficiently press the helical-tooth punches 7,7 towards the center of the cavity 2.
  • the work 4 is placed on an upper surface of the ejector 5 lifted up to its upper position, and then set into the cavity 2 by moving down the ejector 5 to its lower position (see Fig. 3).
  • the extrusion cam 8 is lowered to the second vertical position to press the plurality of helical-tooth punches 7,7 towards the center of the cavity to the second radial position as clearly seen in Fig. 4.
  • the punch assembly 3 is then moved down to its lower position to press the work 4 down as shown in Fig. 8.
  • the work 4 is radially expanded by the pressing force of the punch assembly 3 to fill the straight teeth forging element 6 and the plurality of helical-tooth grooves 9,9. This results in forming straight teeth 10 around the smaller-diametral portion of the work 4 and finishing helical teeth 11 around the larger-diametral portion of the work 4 (see Fig. 7).
  • the plurality of helical-tooth punches 7,7 are returned to the first radial position by means of the plurality of springs 12,12 while the punch assembly 3 is lifted up to its upper position.
  • a through hole for a shaft may be formed in the work 4 after completion of the above forging process, or alternatively formed simultaneously with formation of gear teeth on a ring-shaped work using a mandrel.
  • the helical gear forging device of the invention allows formation of helical teeth with high precision without rotating a work or a die relative to each other.
  • the integrally formed extrusion cam of the device has sufficient strength and preferable durability and is applicable to any teeth number, module, and tooth profile.
  • the plurality of helical-tooth punches and the vertically movable punch assembly may be operated simultaneously to form helical teeth on a side wall of a work.
  • the smaller-diametral portion of the cavity has the straight teeth forging element in the above embodiment, it may be omitted to form a flat boss on the smaller-diametral element of the work.
  • the die may have a one-step cavity instead of the two-step cavity of the embodiment.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
EP93304657A 1992-06-18 1993-06-15 Device for forging a helical gear Withdrawn EP0584907A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP49165/92 1992-06-18
JP1992049165U JP2577170Y2 (ja) 1992-06-18 1992-06-18 ヘリカル歯車の成形装置

Publications (2)

Publication Number Publication Date
EP0584907A2 true EP0584907A2 (fr) 1994-03-02
EP0584907A3 EP0584907A3 (en) 1995-09-06

Family

ID=12823474

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93304657A Withdrawn EP0584907A3 (en) 1992-06-18 1993-06-15 Device for forging a helical gear

Country Status (4)

Country Link
EP (1) EP0584907A3 (fr)
JP (1) JP2577170Y2 (fr)
KR (1) KR940000539U (fr)
CA (1) CA2098662A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999029450A1 (fr) * 1997-12-07 1999-06-17 Feintool International Holding Ag Procede pour l'usinage d'une piece
US5996229A (en) * 1998-09-25 1999-12-07 Yang; Tsung-Hsun Method and mold die for forming a spiral bevel gear from metal powders
EP2060346A2 (fr) * 2007-11-14 2009-05-20 Miba Sinter Austria GmbH Outil d'étanchéité, dispositif de compactage comprenant cet outil et procédé pour la compactage d'une pièce frittée ou de poudres
CN102319759A (zh) * 2011-07-20 2012-01-18 重庆创精温锻成型有限公司 汽车换档结合齿轮齿圈上的齿形导入角冷挤压成型方法
WO2012063130A3 (fr) * 2010-11-12 2012-07-12 Pmg Asturias Powder Metal S.A.U. Procédé de formage d'une pièce
WO2012063125A3 (fr) * 2010-11-12 2012-07-19 Pmg Asturias Powder Metal S.A.U. Outil pour l'usinage d'une pièce
DE102013002043A1 (de) * 2013-02-07 2014-08-07 Sona Blw Präzisionsschmiede Gmbh Kalibriergesenk und Verfahren zur Herstellung eines Getriebe-Schaltrads mit Laufverzahnung

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111531098A (zh) * 2020-04-28 2020-08-14 思进智能成形装备股份有限公司 汽车安全带扭轴的冷镦成型工艺

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3263474A (en) * 1962-12-14 1966-08-02 Ford Motor Co Method and apparatus for forming splines
GB1096846A (en) * 1965-03-25 1967-12-29 Zd Gomselmash Method of and apparatus for manufacturing profiled articles by pressing
US3803896A (en) * 1972-05-19 1974-04-16 Automobilove Zavody Np Method and apparatus for forming locking surfaces on gear rings
JPH02200341A (ja) * 1989-01-27 1990-08-08 Mitsubishi Motors Corp カム型による加工装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3263474A (en) * 1962-12-14 1966-08-02 Ford Motor Co Method and apparatus for forming splines
GB1096846A (en) * 1965-03-25 1967-12-29 Zd Gomselmash Method of and apparatus for manufacturing profiled articles by pressing
US3803896A (en) * 1972-05-19 1974-04-16 Automobilove Zavody Np Method and apparatus for forming locking surfaces on gear rings
JPH02200341A (ja) * 1989-01-27 1990-08-08 Mitsubishi Motors Corp カム型による加工装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 14 no. 491 (M-1040) ,25 October 1990 & JP-A-02 200341 (MITSUBISHI MOTORS CORP) 8 August 1990, *

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999029450A1 (fr) * 1997-12-07 1999-06-17 Feintool International Holding Ag Procede pour l'usinage d'une piece
US6327887B1 (en) 1997-12-07 2001-12-11 Feintool International Holding Ag Process for shaping a work piece
US5996229A (en) * 1998-09-25 1999-12-07 Yang; Tsung-Hsun Method and mold die for forming a spiral bevel gear from metal powders
EP2060346A2 (fr) * 2007-11-14 2009-05-20 Miba Sinter Austria GmbH Outil d'étanchéité, dispositif de compactage comprenant cet outil et procédé pour la compactage d'une pièce frittée ou de poudres
EP2060346A3 (fr) * 2007-11-14 2017-05-17 Miba Sinter Austria GmbH Outil d'étanchéité, dispositif de compactage comprenant cet outil et procédé pour la compactage d'une pièce frittée ou de poudres
WO2012063125A3 (fr) * 2010-11-12 2012-07-19 Pmg Asturias Powder Metal S.A.U. Outil pour l'usinage d'une pièce
WO2012063130A3 (fr) * 2010-11-12 2012-07-12 Pmg Asturias Powder Metal S.A.U. Procédé de formage d'une pièce
CN103260789A (zh) * 2010-11-12 2013-08-21 Pmg阿斯图里亚斯粉末金属公司 加工工件的工具
CN103260789B (zh) * 2010-11-12 2016-07-13 Pmg阿斯图里亚斯粉末金属公司 加工工件的工具
US9427790B2 (en) 2010-11-12 2016-08-30 Pmg Asturias Powder Metal S.A.U. Method for forming a workpiece
CN102319759B (zh) * 2011-07-20 2014-01-15 重庆创精温锻成型有限公司 汽车换档结合齿轮齿圈上的齿形导入角冷挤压成型方法
CN102319759A (zh) * 2011-07-20 2012-01-18 重庆创精温锻成型有限公司 汽车换档结合齿轮齿圈上的齿形导入角冷挤压成型方法
DE102013002043A1 (de) * 2013-02-07 2014-08-07 Sona Blw Präzisionsschmiede Gmbh Kalibriergesenk und Verfahren zur Herstellung eines Getriebe-Schaltrads mit Laufverzahnung

Also Published As

Publication number Publication date
EP0584907A3 (en) 1995-09-06
JP2577170Y2 (ja) 1998-07-23
KR940000539U (ko) 1994-01-03
CA2098662A1 (fr) 1993-12-19
JPH06546U (ja) 1994-01-11

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