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, 2024
Filed:
Apr. 13, 2020
Sumitomo Electric Industries, Ltd., Osaka, JP;
Sumitomo Electric Sintered Alloy, Ltd., Okayama, JP;
Tomoyuki Ishimine, Osaka, JP;
Shigeki Egashira, Osaka, JP;
Munehiro Noda, Osaka, JP;
Takayuki Tashiro, Osaka, JP;
Kazunari Shimauchi, Osaka, JP;
SUMITOMO ELECTRIC INDUSTRIES, LTD., Osaka, JP;
SUMITOMO ELECTRIC SINTERED ALLOY, LTD., Okayama, JP;
Abstract
A method of making a sintered body includes a step of preparing raw material powder containing powder of inorganic material, a step of producing a powder compact having a high-density portion with a relative density of 93% or more and a low-density portion with a relative density of less than 93% by compressing the raw material powder injected into a mold, a step of producing a machined compacted part by machining at least the high-density portion of the powder compact, and a step of sintering the machined compacted part to make a sintered body, wherein a perimeter shape of a cavity constituted by the mold in a cross-section perpendicular to an axial direction of the mold is such than a maximum stress applied to an inner perimeter surface of the mold during a compacting process using the mold is less than or equal to 2.6 times an imaginary maximum stress that is applied to an inner perimeter surface of an imaginary mold during a compacting process using the imaginary mold, the imaginary mold having an imaginary cavity that has a same area as the cavity and that has a circular perimeter shape.