Title:
ROD MATERIAL FOR FORMING HOLE
Document Type and Number:
Japanese Patent JPH081445
Kind Code:
A
Abstract:
PURPOSE: To provide a rod material with which a hole with less curved parts can be formed.
CONSTITUTION: The circumference hardness of a rod member is gradually decreased from the center to the outer periphery of the cross-section of the rod member. Optimumly, the hardness of the center of the cross-section is Hv350 to 390, and the hardness of the outer peripheral part is decreased by Hv15 to 25 therefrom. Accordingly, the hardness is decreased toward the outer periphery, thereby it is possible to form a hole with less curved parts.
Inventors:
HIRAI YOSHIRO
SAITO KAZUO
TAKAHASHI NOBUYUKI
ONO HISAO
SAITO KAZUO
TAKAHASHI NOBUYUKI
ONO HISAO
Application Number:
JP14184094A
Publication Date:
January 09, 1996
Filing Date:
June 23, 1994
Export Citation:
Assignee:
CITIZEN WATCH CO LTD
International Classes:
G04D3/00; B23P15/32; (IPC1-7): B23P15/32; G04D3/00
Next Patent: PART SUPPLY METHOD AND DEVICE THEREFOR