JPS5770050A - Working method for pivot part of cast iron rocker arm - Google Patents

Working method for pivot part of cast iron rocker arm

Info

Publication number
JPS5770050A
JPS5770050A JP55147452A JP14745280A JPS5770050A JP S5770050 A JPS5770050 A JP S5770050A JP 55147452 A JP55147452 A JP 55147452A JP 14745280 A JP14745280 A JP 14745280A JP S5770050 A JPS5770050 A JP S5770050A
Authority
JP
Japan
Prior art keywords
cast iron
small
rocker arm
pivot part
coining
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
JP55147452A
Other languages
Japanese (ja)
Other versions
JPS5838264B2 (en
Inventor
Chiaki Tsumiki
Koichi Takeda
Kazuhiko Tsuda
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.)
Toyota Motor Corp
Original Assignee
Toyota Motor Corp
Toyota Jidosha Kogyo KK
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 Toyota Motor Corp, Toyota Jidosha Kogyo KK filed Critical Toyota Motor Corp
Priority to JP55147452A priority Critical patent/JPS5838264B2/en
Publication of JPS5770050A publication Critical patent/JPS5770050A/en
Publication of JPS5838264B2 publication Critical patent/JPS5838264B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Forging (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

PURPOSE: To make hot coining possible within the range of the deformability of a rough shape material made of cast iron despite the small deformation ability by incorporating a specific shape for the pivot shape of the rough shape material.
CONSTITUTION: A rough shape material for a rocker arm is made of cast iron of small deformability. At this time, a pivot part 2 is formed into the shape which is larger than the R size of the product, offcenters the R center position from the R center position of the product and further relieves a bottom part 21. The pivot part of such material is hot coined at above 450°C. Then, a coining allowances are small both when the R is large and when it is small, and the part 21 and an inlet part 22 are kept free from application of tensile stress, thus good coining is accomplished.
COPYRIGHT: (C)1982,JPO&Japio
JP55147452A 1980-10-21 1980-10-21 Machining method of pivot part of cast iron Rocker arm Expired JPS5838264B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55147452A JPS5838264B2 (en) 1980-10-21 1980-10-21 Machining method of pivot part of cast iron Rocker arm

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55147452A JPS5838264B2 (en) 1980-10-21 1980-10-21 Machining method of pivot part of cast iron Rocker arm

Publications (2)

Publication Number Publication Date
JPS5770050A true JPS5770050A (en) 1982-04-30
JPS5838264B2 JPS5838264B2 (en) 1983-08-22

Family

ID=15430669

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55147452A Expired JPS5838264B2 (en) 1980-10-21 1980-10-21 Machining method of pivot part of cast iron Rocker arm

Country Status (1)

Country Link
JP (1) JPS5838264B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0261308A (en) * 1988-08-27 1990-03-01 Mazda Motor Corp Manufacture of locker arm
JPH03104107U (en) * 1990-02-09 1991-10-29

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0261308A (en) * 1988-08-27 1990-03-01 Mazda Motor Corp Manufacture of locker arm
JPH03104107U (en) * 1990-02-09 1991-10-29

Also Published As

Publication number Publication date
JPS5838264B2 (en) 1983-08-22

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