JPS54125154A - Forging method for slenderizing - Google Patents

Forging method for slenderizing

Info

Publication number
JPS54125154A
JPS54125154A JP3393478A JP3393478A JPS54125154A JP S54125154 A JPS54125154 A JP S54125154A JP 3393478 A JP3393478 A JP 3393478A JP 3393478 A JP3393478 A JP 3393478A JP S54125154 A JPS54125154 A JP S54125154A
Authority
JP
Japan
Prior art keywords
hole
end portion
slenderizing
blank
diameter
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.)
Pending
Application number
JP3393478A
Other languages
Japanese (ja)
Inventor
Chihiro Hayashi
Masaru Takatani
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.)
Nippon Steel Corp
Original Assignee
Sumitomo Metal Industries 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 Sumitomo Metal Industries Ltd filed Critical Sumitomo Metal Industries Ltd
Priority to JP3393478A priority Critical patent/JPS54125154A/en
Publication of JPS54125154A publication Critical patent/JPS54125154A/en
Pending legal-status Critical Current

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  • Forging (AREA)

Abstract

PURPOSE: To carry out forging work for obtaining the superior slender form, by previously drilling a preparatory hole in the portion to be slenderized of the blank.
CONSTITUTION: A preparatory hole 6 of diameter d1 is drilled in the top end portion 4B of the blank 4 of diameter D in the axial direction of the top end portion 4B; the forging work for slenderizing is applied to this blank 4 within the dies 2. The dies 2 has a small hole 1 of diameter d2, and the knockout pin 7 is inserted into this hole 1. The bottom end portion 4A is pressed by the punch 3 toward the hole 1 so as to make the top end portion 4B to face toward the hole 1; hereby, the top end portion 4B is easily slenderized into the diameter d2. Besides, the slenderizing is carried out by a low working pressure, hence the tightening force of the blank 4 against the inner surface of the hole 1 becomes weak, and the knockout of the forged product 8 by th knockout pin 7 is easy, and the life of the knockout pin 7 becomes long. According to this method, the slenderizing work of above 50% reduction of area can be easily carried out by a low working pressure.
COPYRIGHT: (C)1979,JPO&Japio
JP3393478A 1978-03-24 1978-03-24 Forging method for slenderizing Pending JPS54125154A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3393478A JPS54125154A (en) 1978-03-24 1978-03-24 Forging method for slenderizing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3393478A JPS54125154A (en) 1978-03-24 1978-03-24 Forging method for slenderizing

Publications (1)

Publication Number Publication Date
JPS54125154A true JPS54125154A (en) 1979-09-28

Family

ID=12400330

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3393478A Pending JPS54125154A (en) 1978-03-24 1978-03-24 Forging method for slenderizing

Country Status (1)

Country Link
JP (1) JPS54125154A (en)

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