JPS5641041A - Spherical face forming method of end face of screw blank material - Google Patents

Spherical face forming method of end face of screw blank material

Info

Publication number
JPS5641041A
JPS5641041A JP11574479A JP11574479A JPS5641041A JP S5641041 A JPS5641041 A JP S5641041A JP 11574479 A JP11574479 A JP 11574479A JP 11574479 A JP11574479 A JP 11574479A JP S5641041 A JPS5641041 A JP S5641041A
Authority
JP
Japan
Prior art keywords
face
blank material
cut
screw blank
spherical
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
JP11574479A
Other languages
Japanese (ja)
Inventor
Masami Obara
Takamitsu Suzuki
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
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 filed Critical Toyota Motor Corp
Priority to JP11574479A priority Critical patent/JPS5641041A/en
Publication of JPS5641041A publication Critical patent/JPS5641041A/en
Pending legal-status Critical Current

Links

Landscapes

  • Forging (AREA)

Abstract

PURPOSE: To obtain a spherical face of high surface roughness with good efficiency by once forming the cut face of a blank material into a concave shape then applying predetermined cold forging thereto.
CONSTITUTION: A screw blank material 1a of a predetermined length is cut from a coil material. This is then mounted to the set hole 10 of a die 9 and the cut face 1' is preliminarily formed by a punch 12 of a conically shaped tip to a concave face 13 to expose the new blank surface 14. Thence, the blank material 1d after the preliminary molding is mounted in the set hole of a die 13 and the end face 1' is subjected to cold working by a finishing punch 16 having a concave spherical face 15 of a radius R3 so that the convex spherical face of a radius R3 is formed. After this, an ejector rod 19 is pushed up to extract the screw blank material 1e, which is then remove of burr 18 by finishing.
COPYRIGHT: (C)1981,JPO&Japio
JP11574479A 1979-09-11 1979-09-11 Spherical face forming method of end face of screw blank material Pending JPS5641041A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11574479A JPS5641041A (en) 1979-09-11 1979-09-11 Spherical face forming method of end face of screw blank material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11574479A JPS5641041A (en) 1979-09-11 1979-09-11 Spherical face forming method of end face of screw blank material

Publications (1)

Publication Number Publication Date
JPS5641041A true JPS5641041A (en) 1981-04-17

Family

ID=14669976

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11574479A Pending JPS5641041A (en) 1979-09-11 1979-09-11 Spherical face forming method of end face of screw blank material

Country Status (1)

Country Link
JP (1) JPS5641041A (en)

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