JPS6431537A - Heading method for hollow part - Google Patents

Heading method for hollow part

Info

Publication number
JPS6431537A
JPS6431537A JP18863387A JP18863387A JPS6431537A JP S6431537 A JPS6431537 A JP S6431537A JP 18863387 A JP18863387 A JP 18863387A JP 18863387 A JP18863387 A JP 18863387A JP S6431537 A JPS6431537 A JP S6431537A
Authority
JP
Japan
Prior art keywords
punch
hollow
die
closed
hollow hole
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
JP18863387A
Other languages
Japanese (ja)
Other versions
JPH03140B2 (en
Inventor
Hirotatsu Takeuchi
Yutaka Tanaka
Takehiko Miyazaki
Noboru Saito
Haruo Kubo
Naoyuki Kotake
Makoto Nagumo
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.)
Nitto Kohki Co Ltd
Original Assignee
Nitto Kohki 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 Nitto Kohki Co Ltd filed Critical Nitto Kohki Co Ltd
Priority to JP18863387A priority Critical patent/JPS6431537A/en
Publication of JPS6431537A publication Critical patent/JPS6431537A/en
Publication of JPH03140B2 publication Critical patent/JPH03140B2/ja
Granted legal-status Critical Current

Links

Abstract

PURPOSE:To shorten the cutting time of a hollow part with circumferential groove by forming a closed hollow hole by front and rear punches on the circular columnar blank of the die inside and punching the hollow hole after forming an outer circular groove with the pressure of a die and sleeve. CONSTITUTION:A 1st closed hollow hole 20a is formed by pressing the circular columnar blank of the inside of a die 25 with a rear punch 25 by a front punch 21. A 2nd closed hollow hole 30b is then formed with the pressing of a front punch 31. The semi-finished part 30 inserted into a rear punch 44 and supported by a front punch 41 is pressed by approaching it by a die 45 and sleeve 42 and the specified external shape with an outer circular groove 55a is formed. The closed part of the opposite hollow holes of this forming part is punched by a front punch 51 to make a hollow part 50. This hollow heading part 50 is formed with the specified outer circular groove, the cutting time thereafter is widely shortened and the material yield is improved.
JP18863387A 1987-07-28 1987-07-28 Heading method for hollow part Granted JPS6431537A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18863387A JPS6431537A (en) 1987-07-28 1987-07-28 Heading method for hollow part

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18863387A JPS6431537A (en) 1987-07-28 1987-07-28 Heading method for hollow part

Publications (2)

Publication Number Publication Date
JPS6431537A true JPS6431537A (en) 1989-02-01
JPH03140B2 JPH03140B2 (en) 1991-01-07

Family

ID=16227115

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18863387A Granted JPS6431537A (en) 1987-07-28 1987-07-28 Heading method for hollow part

Country Status (1)

Country Link
JP (1) JPS6431537A (en)

Also Published As

Publication number Publication date
JPH03140B2 (en) 1991-01-07

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