EP0755734B1 - Procédé pour l'extrusion à froid d'une roue dentée conique avec arbre de rotation intégral et roue dentée conique ainsi obtenue - Google Patents

Procédé pour l'extrusion à froid d'une roue dentée conique avec arbre de rotation intégral et roue dentée conique ainsi obtenue Download PDF

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Publication number
EP0755734B1
EP0755734B1 EP96201948A EP96201948A EP0755734B1 EP 0755734 B1 EP0755734 B1 EP 0755734B1 EP 96201948 A EP96201948 A EP 96201948A EP 96201948 A EP96201948 A EP 96201948A EP 0755734 B1 EP0755734 B1 EP 0755734B1
Authority
EP
European Patent Office
Prior art keywords
bevel gear
gear
die
teeth
rotation pivot
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.)
Expired - Lifetime
Application number
EP96201948A
Other languages
German (de)
English (en)
Other versions
EP0755734A1 (fr
Inventor
Carlo Cattaneo
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.)
Leonardo SRL
Original Assignee
Leonardo SRL
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 Leonardo SRL filed Critical Leonardo SRL
Publication of EP0755734A1 publication Critical patent/EP0755734A1/fr
Application granted granted Critical
Publication of EP0755734B1 publication Critical patent/EP0755734B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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

  • This invention relates to a method for forming, by the cold extrusion of a metal blank, a small-dimension bevel gear integral with a rotation pivot, the pivot extending from the root of the teeth of said gear.
  • the invention also relates to the gear obtained by said method, and the mould for its implementation.
  • JP-A-64 002756 refers to a production of bevel gear with a die with a preform piece.
  • JP-A-60 184444 relates to a cold forming method of splinz shaft with conduction parts.
  • US-A-3 429 172 discloses a method of making gear forging apparatus, in particular for spiral gear.
  • bevel gear pairs for this purpose is extremely limited because the relatively small dimensions required of the gears complete with their rotation pivot result in very high production costs, especially if said bevel gears are to be applied to products of wide consumption.
  • the general object of the present invention is therefore to provide an economical method which enables, by cold extrusion, a small-dimension bevel gear integral with a rotation pivot to be formed, as part of a bevel gear pair for transmitting motion between mutually perpendicular axes.
  • a further object of the invention is to provide a mould for implementing the method.
  • the method of the invention for extruding a small-dimension bevel gear integral with a rotation pivot starts with a metal wire 10 which is made to advance stepwise, guided by a head 12, in the direction of the arrow 11 until it abuts against a mechanical stop 13, which determines the exact length "1" of the end piece 14 of wire 10 to be used.
  • Said piece 14 is cut from the wire 10, as shown in Figure 2, by a blade 15 which advances in the direction of the arrow 16, so as to obtain a pin 17 forming the blank to be used for the cold extrusion of a small-dimension bevel gear with an integral rotation pivot extending from the root of the teeth of said gear.
  • the pin 17 obtained in this manner is inserted into a die 18 of configuration corresponding to that of the finished article to be obtained.
  • the die 18 is formed within a so-called anvil 19 of a mould provided with an extractor 20 for the extruded article ( Figure 3).
  • the pin 17 is only partly inserted into the die 18, an end portion projecting from the die as clearly seen in Figure 3, to be deformed by a first hammer 21 of said mould ( Figures 4-7), which moves in the directions of the arrows 22, 23.
  • the hammer 21 is provided with a cavity 24 arranged to engage the projecting free end of the pin 17 (Figure 5), so as to define on the pin 17 a terminal head 25, serving as the base blank for the definitive extrusion of the bevel gear, the remaining part of the pin 17 defining a rotation pivot 26 for said gear ( Figures 5-7).
  • the gear is formed from the head 25 by a punch 27 provided in a second hammer 28, the punch 27, by being lowered from the position shown in Figure 8 to the position shown in Figure 9, deforming said head 25 so as to further expand the material and cause it to completely fill the empty spaces in the die 18 with precision (see Figures 9 and 10, and Figure 11 which represents an enlargement of Figure 9 in correspondence with the extrusion region for the gear teeth, so as to obtain a bevel gear 34 integral with the pivot 26.
  • the second hammer 28 has a partly spherical cavity 29 which correspondingly shapes the summit of the teeth 33 of the gear 34.
  • said cavity 29 closes the top of the die 18 with great precision and in a sealed manner, so preventing inadmissible escape of material from the closed mould.
  • the punch 27 is of polygonal shape, for example hexagonal, so as to define in the bevel gear a seat 30 for an operating key.
  • the bevel gear 34 complete with rotation pivot obtained by the method of the invention is extracted from the anvil 19 by moving the extractor 20 in the direction of the arrow 31.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Gears, Cams (AREA)
  • Heat Treatment Of Articles (AREA)

Claims (3)

  1. Procédé pour former, par extrusion à froid d'un flan métallique, une roue dentée conique de petites dimensions faisant corps avec un arbre de rotation qui s'étend du côté de la roue où se trouvent les dents, comprenant les étapes consistant à:
    introduire un élément mâle (17) dans une matrice (18) prise dans une enclume (19), ladite matrice comportant des dents de roue qui ont une configuration correspondant à celle de l'article fini à obtenir, une partie terminale dudit élément mâle (17) faisant saillie depuis ladite matrice (18);
    déformer l'extrémité libre dudit élément mâle (17) à l'aide d'un premier marteau (21) pour définir une tête terminale (25) servant de flan de base pour extruder les dents (33) de la roue conique, le reste de l'élément mâle (17) définissant un arbre de rotation (26) pour ladite roue dentée;
    déformer ladite tête (25) à l'aide d'un poinçon (27) disposé dans un deuxième marteau (28), ledit poinçon étant introduit sur une certaine distance dans ladite tête (25) afin de repousser la matière et de l'obliger à remplir entièrement et avec précision les espaces vides de la matrice (18); et
    extraire de ladite enclume (19) la roue dentée conique (34) ainsi formée, faisant corps avec son arbre de rotation.
  2. Procédé selon la revendication 1, caractérisé en ce que des portions (32) des dents (33) de la roue sont déjà formées dans ladite tête (25), en regard des pieds desdites dents (33).
  3. Moule pour former, par extrusion à froid d'un flan métallique, une roue dentée conique de petites dimensions faisant corps avec un arbre de rotation réalisée à l'aide du procédé selon la revendication 1, caractérisé en ce qu'il comprend une enclume (19) et un premier et un deuxième marteaux (21, 28), ladite enclume étant munie de ladite matrice (18), qui comporte des dents de roue dentée et a une configuration correspondant à celle de l'article fini à réaliser, et d'un extracteur (20), le premier marteau (21) étant pourvu d'une cavité (24) conçue pour former ladite tête (25), le deuxième marteau (28) étant pourvu du poinçon (27) et d'une deuxième cavité (29) conçue pour façonner le sommet des dents (33) de la roue dentée conique, et pour fermer la matrice (18) d'une manière parfaitement étanche.
EP96201948A 1995-07-27 1996-07-11 Procédé pour l'extrusion à froid d'une roue dentée conique avec arbre de rotation intégral et roue dentée conique ainsi obtenue Expired - Lifetime EP0755734B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT95MI001640A IT1277365B1 (it) 1995-07-27 1995-07-27 Procedimento per la realizzazione mediante stampaggio a freddo di un ingranaggio conico solidale ad un perno di rotazione ed
ITMI951640 1995-07-27

Publications (2)

Publication Number Publication Date
EP0755734A1 EP0755734A1 (fr) 1997-01-29
EP0755734B1 true EP0755734B1 (fr) 2001-05-09

Family

ID=11372069

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96201948A Expired - Lifetime EP0755734B1 (fr) 1995-07-27 1996-07-11 Procédé pour l'extrusion à froid d'une roue dentée conique avec arbre de rotation intégral et roue dentée conique ainsi obtenue

Country Status (5)

Country Link
EP (1) EP0755734B1 (fr)
AT (1) ATE200992T1 (fr)
DE (1) DE69612706T2 (fr)
ES (1) ES2158228T3 (fr)
IT (1) IT1277365B1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102166588A (zh) * 2010-02-25 2011-08-31 蒋永宋 用冷挤压工艺加工半轴齿轮的方法
CN106238662B (zh) * 2016-08-24 2018-11-20 江苏金源高端装备股份有限公司 一种变速箱齿轮的锻造工艺

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3429172A (en) * 1965-10-05 1969-02-25 Trw Inc Method of making gear forging apparatus
JPH0685970B2 (ja) * 1984-03-01 1994-11-02 富士重工業株式会社 傘歯車付きスプライン軸の冷間成形方法
JPH0710413B2 (ja) * 1987-06-24 1995-02-08 武蔵精密工業株式会社 傘歯車の製造方法

Also Published As

Publication number Publication date
EP0755734A1 (fr) 1997-01-29
ATE200992T1 (de) 2001-05-15
DE69612706T2 (de) 2002-04-18
DE69612706D1 (de) 2001-06-13
ITMI951640A1 (it) 1997-01-27
IT1277365B1 (it) 1997-11-10
ITMI951640A0 (it) 1995-07-27
ES2158228T3 (es) 2001-09-01

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