JPS57160543A - Cold forging method of hollow cylindrical body - Google Patents
Cold forging method of hollow cylindrical bodyInfo
- Publication number
- JPS57160543A JPS57160543A JP4760481A JP4760481A JPS57160543A JP S57160543 A JPS57160543 A JP S57160543A JP 4760481 A JP4760481 A JP 4760481A JP 4760481 A JP4760481 A JP 4760481A JP S57160543 A JPS57160543 A JP S57160543A
- Authority
- JP
- Japan
- Prior art keywords
- cylindrical body
- dies
- projecting part
- punch
- ejector
- 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
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
- B21K21/00—Making hollow articles not covered by a single preceding sub-group
- B21K21/08—Shaping hollow articles with different cross-section in longitudinal direction, e.g. nozzles, spark-plugs
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
PURPOSE:To prevent a trouble such as seizure of dies, breakdown of a punch, etc., by piercing a through-hole on a projecting part of a rough cylindrical body formed by composite extrusion, and subsequently, forming a tapered part on said projecting part. CONSTITUTION:A material M of prescribed dimensions is set to a fixed position in dies 11, a stepped punch 2 is made to go down from the upper part, simultaneously a ram 32 is made to go up from an ejector 31, and a rough cylindrical body M4 on which a linear projecting part C has been formed by means of composite extrusion is pressed and molded. Subsequently, a punch 2c being somewhat thick is made to go down to said rough cylindrical body M4, and an intermediate rough cylindrical body M5 which has pierced a short through-hole D on said projecting part C is pressed and molded. Subsequently, said intermediate rough cylindrical body M5 is taken out from the dies 11 by making the ejector 11 go up, is inserted into dies 12 for molding a finished cylindrical body, which has been prepared separately, and said linear projecting part C is formed to a tapered part E by making the punch 2 go down. After that, a finished cylindrical body M6 is taken out from the dies 12 by making an ejector 33 go up.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4760481A JPS57160543A (en) | 1981-03-31 | 1981-03-31 | Cold forging method of hollow cylindrical body |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4760481A JPS57160543A (en) | 1981-03-31 | 1981-03-31 | Cold forging method of hollow cylindrical body |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS57160543A true JPS57160543A (en) | 1982-10-02 |
JPS6358661B2 JPS6358661B2 (en) | 1988-11-16 |
Family
ID=12779835
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4760481A Granted JPS57160543A (en) | 1981-03-31 | 1981-03-31 | Cold forging method of hollow cylindrical body |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57160543A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59199142A (en) * | 1983-04-27 | 1984-11-12 | Tokai Rika Co Ltd | Cold forging method of hollow cylindrical body |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0232957U (en) * | 1988-08-19 | 1990-03-01 |
-
1981
- 1981-03-31 JP JP4760481A patent/JPS57160543A/en active Granted
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59199142A (en) * | 1983-04-27 | 1984-11-12 | Tokai Rika Co Ltd | Cold forging method of hollow cylindrical body |
JPH0258020B2 (en) * | 1983-04-27 | 1990-12-06 | Tokai Rika Co Ltd |
Also Published As
Publication number | Publication date |
---|---|
JPS6358661B2 (en) | 1988-11-16 |
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