JPS5594748A - Heading molding method of ring body - Google Patents

Heading molding method of ring body

Info

Publication number
JPS5594748A
JPS5594748A JP256379A JP256379A JPS5594748A JP S5594748 A JPS5594748 A JP S5594748A JP 256379 A JP256379 A JP 256379A JP 256379 A JP256379 A JP 256379A JP S5594748 A JPS5594748 A JP S5594748A
Authority
JP
Japan
Prior art keywords
blank
ring body
face
cut
central part
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
Application number
JP256379A
Other languages
Japanese (ja)
Other versions
JPS5614378B2 (en
Inventor
Yoshiichi Sakamura
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.)
Sakamura Machinery Co Ltd
Original Assignee
Sakamura Machinery 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 Sakamura Machinery Co Ltd filed Critical Sakamura Machinery Co Ltd
Priority to JP256379A priority Critical patent/JPS5594748A/en
Publication of JPS5594748A publication Critical patent/JPS5594748A/en
Publication of JPS5614378B2 publication Critical patent/JPS5614378B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Bolts, Nuts, And Washers (AREA)
  • Forging (AREA)

Abstract

PURPOSE: To obtain the product of high strength which does not produce any cracking by concentrically shifting rupture structures to the central part to be formed with hole and blanking the central part in piercing process in pressure-molding the ring body by using the blank provided with shear-cut rupture structures at the end face of the cutting part.
CONSTITUTION: An iron-made round bar blank 12 having been cut to the specified size is heading-molded by using the punches 7 thru 10 provided with spherical protruding parts and the intermediate dies 2 thru 5 provided with step parts to shift the shear cut rupture structures S, S' appearing in the end face of the cutting part of the blank to the end face S3 of the small cylindrical part 12g and the bottom S3' of the semi-spherical recess 12f. Thence, if the blank 12' is fitted to the piercing die 6 of the final process and the central part is blanked by a punch 11, the small cylindrical part 12g' is borken down at the step part 12h and a through-hole 12i is formed, whereby the ring body 13 free from rupture structures is obtained. By this method, the product of high quality may be volume-produced without requiring excess workings.
COPYRIGHT: (C)1980,JPO&Japio
JP256379A 1979-01-11 1979-01-11 Heading molding method of ring body Granted JPS5594748A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP256379A JPS5594748A (en) 1979-01-11 1979-01-11 Heading molding method of ring body

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP256379A JPS5594748A (en) 1979-01-11 1979-01-11 Heading molding method of ring body

Publications (2)

Publication Number Publication Date
JPS5594748A true JPS5594748A (en) 1980-07-18
JPS5614378B2 JPS5614378B2 (en) 1981-04-03

Family

ID=11532833

Family Applications (1)

Application Number Title Priority Date Filing Date
JP256379A Granted JPS5594748A (en) 1979-01-11 1979-01-11 Heading molding method of ring body

Country Status (1)

Country Link
JP (1) JPS5594748A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4932251A (en) * 1987-12-22 1990-06-12 Miyamatool Kabushikikaisha Method of producing a core for a fuel injector

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4932251A (en) * 1987-12-22 1990-06-12 Miyamatool Kabushikikaisha Method of producing a core for a fuel injector

Also Published As

Publication number Publication date
JPS5614378B2 (en) 1981-04-03

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