Manufacturing method of sintered compact machine component having inner and outer part

Disclosed is a method of manufacturing a machine component of sintered ferriferous composite comprising an outer part and an inner part which is fitted into a hole of the outer part. It has the steps of: preparing one of the outer part and the inner part as a green compact of ferriferous powdered me...

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Bibliographic Details
Main Authors KAZUO ASAKA, MASAHIRO SUZUKI, TSUYOSHI KAGAYA
Format Patent
LanguageEnglish
Published 17.05.2000
Edition7
Subjects
CASTING
MAKING METALLIC POWDER
MANUFACTURE OF ARTICLES FROM METALLIC POWDER
PERFORMING OPERATIONS
POWDER METALLURGY
TRANSPORTING
WORKING METALLIC POWDER
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Summary:Disclosed is a method of manufacturing a machine component of sintered ferriferous composite comprising an outer part and an inner part which is fitted into a hole of the outer part. It has the steps of: preparing one of the outer part and the inner part as a green compact of ferriferous powdered metal and the other as one of a green compact of ferriferous powdered metal, a sintered compact of ferriferous powdered metal and a mass of ferriferous molten metal; inserting the inner part into the hole of the outer part; and sintering the outer part and the inner part to bond the outer part and the inner part. The outer part and the inner part are prepared to have a fitting clearance of approximately -100 to +5 žm. When only the outer part is prepared as a green compact, the outer part is prepared to contain substantially no zinc, and the atmosphere at the sintering step is substantially non-carburizing atmosphere, and when the inner part is prepared as a green compact, the outer and inner parts are prepared so that only the inner part contains zinc, and the atmosphere at the sintering step is substantially carburizing atmosphere.
Bibliography:Application Number: GB19990021834