JPS5577938A - Processing method for center hole - Google Patents

Processing method for center hole

Info

Publication number
JPS5577938A
JPS5577938A JP15001578A JP15001578A JPS5577938A JP S5577938 A JPS5577938 A JP S5577938A JP 15001578 A JP15001578 A JP 15001578A JP 15001578 A JP15001578 A JP 15001578A JP S5577938 A JPS5577938 A JP S5577938A
Authority
JP
Japan
Prior art keywords
hole
angle
center hole
punch
carrying
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
JP15001578A
Other languages
Japanese (ja)
Other versions
JPS574474B2 (en
Inventor
Hiromasa Yokota
Nobuo Miyairi
Ikuo Kurashima
Hisashi Abe
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.)
Nissan Motor Co Ltd
Original Assignee
Nissan Motor 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 Nissan Motor Co Ltd filed Critical Nissan Motor Co Ltd
Priority to JP15001578A priority Critical patent/JPS5577938A/en
Publication of JPS5577938A publication Critical patent/JPS5577938A/en
Publication of JPS574474B2 publication Critical patent/JPS574474B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Percussive Tools And Related Accessories (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Abstract

PURPOSE: To form the center hole on the work in a short time, by making a hole processing the tip face of the work by the punch having smaller angle than that of using center hole and next, carrying out press processing by the punch having the same angle to the using center hole so as to be shaped to the above-mentioned hole.
CONSTITUTION: At first, the hole 8 having the angle A, is formed by carrying out press processing of the tip face of the work 2 by the punch 1 having smaller angle than that of using center hole and next, the using center hole 10 is formed carrying out press processing by the punch 3 having the same angle to the angle B of the hole 10 so as to be shaped to the above-mentioned hole having small angle. Also, the small angle hole 8 is formed by carrying out press processing of work tip face by the punch 4 having the smaller angle C than that of the using center hole, as another method. Next, a large angle part (the cave-in part 9) is formed by carrying out press processing by the punch 6 having the larger angle D than that of the using center hole so as to be shaped to the above-mentioned hole 8 and continuously, the using center hole 10 is formed by carrying out press processing by the punch 7 having the same angle E to that of the using center hole so as to be adjusted to the above-mentioned hole and preventing the damage of the hole, as another method.
COPYRIGHT: (C)1980,JPO&Japio
JP15001578A 1978-12-06 1978-12-06 Processing method for center hole Granted JPS5577938A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15001578A JPS5577938A (en) 1978-12-06 1978-12-06 Processing method for center hole

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15001578A JPS5577938A (en) 1978-12-06 1978-12-06 Processing method for center hole

Publications (2)

Publication Number Publication Date
JPS5577938A true JPS5577938A (en) 1980-06-12
JPS574474B2 JPS574474B2 (en) 1982-01-26

Family

ID=15487605

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15001578A Granted JPS5577938A (en) 1978-12-06 1978-12-06 Processing method for center hole

Country Status (1)

Country Link
JP (1) JPS5577938A (en)

Also Published As

Publication number Publication date
JPS574474B2 (en) 1982-01-26

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