The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 03, 1985
Filed:
Jul. 07, 1983
Applicant:
Inventors:
Kazuo Asaka, Chiba, JP;
Takashi Koyama, Chiba, JP;
Assignee:
Hitachi Powdered Metals Co., Ltd., Chiba, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B22F / ;
U.S. Cl.
CPC ...
419-6 ; 419 38 ; 1481261 ; 148127 ; 228131 ;
Abstract
A process for making a sintered mechanical part with a complex profile by preparing separately a compact having a shaft (referred to as the inner compact) and a compact having an opening (hereinafter referred to as the outer compact) by the compression of iron-based metal powders, and sintering both compacts in a state where the inner compact is fitted into the cutter compact, wherein a difference in fitting size between the shaft and the opening is selected such that interference fitting takes place with the interference being fixed at a value equal to, or lower than, the figure determined by the following calculation: