Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
FORMATION OF INTERNAL GEAR
Document Type and Number:
Japanese Patent JPH0751781
Kind Code:
A
Abstract:

PURPOSE: To facilitate maintaining precision of internal gear by forming teeth on the inner circumference of drum part by cold plastic pressing and integrally forming a boss member and drum member.

CONSTITUTION: The boss member 3 is prelimiarily formed by pressing, etc. The boss member 3 is superposed with the disk like drum member 2 to be formed. The members 2 and 3 are rotated at a specific number of revolution and held between a forming die 10 having teeth on its outer circumferential surface and a die 20. While the boss member 3 is pressed to annularly arranged plural forming rollers 30, the rollers 30 are moved along the die 10, teeth are formed on the inner circumferential surface of the member 2 by cold plastic working, the members 2 and 3 are integrally formed and the strength of drum part is increased by utilizing internal stress generated in the forming process. Thus, the boss member and drum member are joined even when the materials of both members cannot be mutually welded.


Inventors:
Nishigori, Sakae
Goho, Yoshinori
Application Number:
JP1993000225153
Publication Date:
February 28, 1995
Filing Date:
August 17, 1993
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
GOOSHIYUU:KK
International Classes:
B21D22/16; B21D53/28; B21H5/00; (IPC1-7): B21D53/28; B21D22/16
Attorney, Agent or Firm:
林 清明 (外1名)



 
Next Patent: PRODCTION OF COIL SPRING