JPH0385144U

JPH0385144U -

Info

Publication number: JPH0385144U
Application number: JP14694489U
Authority: JP
Priority date: 1989-12-20
Filing date: 1989-12-20
Publication date: 1991-08-28
Anticipated expiration: 2004-12-20
Also published as: JPH0718453Y2

Description

[Brief explanation of drawings]

第１図は本考案の一実施例である鍛造型の第一
および第二のガイド孔の各開口周縁にそれぞれ形
成された丸み部を示す正面断面図である。第２図
は上記鍛造型を示す正面断面図である。第３図は
上記鍛造型の溝成形部材を示す平面図である。第
４図は上記鍛造型により成形される内輪を示す斜
視図である。第５図は上記鍛造型による鍛造終了
状態を示す第３図における−断面図である。
第６図は上記鍛造型により内輪を成形する際の上
記丸み部の半径と折り込み深さおよびポンチ面圧
との関係を示すグラフである。第７図は従来の鍛
造型で成形された内輪を示す斜視図である。第８
図ａ、第８図ｂおよび第８図ｃはそれぞれ、従来
の鍛造型による内輪成形工程を説明する図である
。１０……内輪、２０……上型、２２……下型、
２４……第一ガイド、２６……第一ガイド孔、２
８……第一ポンチ、３０……突部、３６……位置
決めリング、４２……第二ガイド、４４……第二
ガイド孔、４６……第二ポンチ、４８……突部、
５６……溝成形部材、６０……溝成形用突部、７
０，７２……丸み部、８０……素材。 FIG. 1 is a front sectional view showing rounded portions formed at the opening peripheries of first and second guide holes of a forging die according to an embodiment of the present invention. FIG. 2 is a front sectional view showing the forging die. FIG. 3 is a plan view showing the groove forming member of the forging die. FIG. 4 is a perspective view showing the inner ring formed by the forging die. FIG. 5 is a cross-sectional view taken from FIG. 3 showing a completed state of forging using the forging die.
FIG. 6 is a graph showing the relationship between the radius of the rounded portion, the folding depth, and the punch surface pressure when forming the inner ring using the forging die. FIG. 7 is a perspective view showing an inner ring formed using a conventional forging die. 8th
FIG. 8a, FIG. 8b, and FIG. 8c are diagrams each illustrating an inner ring forming process using a conventional forging die. 10...Inner ring, 20...Upper mold, 22...Lower mold,
24...first guide, 26...first guide hole, 2
8...First punch, 30...Protrusion, 36...Positioning ring, 42...Second guide, 44...Second guide hole, 46...Second punch, 48...Protrusion,
56...Groove forming member, 60...Groove forming protrusion, 7
0,72...Rounded part, 80...Material.

Claims

[Claims for Utility Model Registration] A first guide and a second guide that are provided so as to be able to approach and separate from each other and each have a first guide hole and a second guide hole concentrically parallel to the direction of approach and separation. , a first punch and a second punch that are slidably fitted into the first guide hole and the second guide hole, respectively, and have protrusions formed at the centers of mutually opposing end surfaces; The guide is provided between the guide and the second guide so as to be able to approach and move away from the center lines of the first and second guide holes, and the inner end surface facing the center line is the outer peripheral surface of the inner ring for constant velocity joint. a plurality of mold members having a shape corresponding to a part of the shape, and forming a cavity that cooperates with each other to form a cavity corresponding to the outer shape of the inner ring for constant velocity joint at the approaching position; In a forging die for an inner ring for a constant velocity joint, the forging die for an inner ring for a constant velocity joint includes a die member restraining device having an operative state for preventing retreat and a non-operative state for allowing separation of the die members, wherein the first guide hole and the second guide hole radius 1.5 at the periphery of the opening to the cavity, respectively.
A forging die characterized by having a rounded part of mm or more.