Tapping-free sintering process for internal thread of MIM product

The invention discloses a tapping-free sintering process for an internal thread of an MIM product. The process comprises the following steps (1) preparation of a POM screw mould core: calculating thedimension of the POM screw mould core according to dimension of the internal thread of the MIM produc...

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Bibliographic Details
Main Authors GU ZHANFENG, LUO ZHAOFEI
Format Patent
LanguageChinese
English
Published 03.01.2020
Subjects
CASTING
MAKING METALLIC POWDER
MANUFACTURE OF ARTICLES FROM METALLIC POWDER
PERFORMING OPERATIONS
POWDER METALLURGY
TRANSPORTING
WORKING METALLIC POWDER
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Summary:The invention discloses a tapping-free sintering process for an internal thread of an MIM product. The process comprises the following steps (1) preparation of a POM screw mould core: calculating thedimension of the POM screw mould core according to dimension of the internal thread of the MIM product and shrinking percentage of a POM material and manufacturing the POM screw mould core according to corresponding dimension; (2) preparation of an MIM injection molding blank: first, injecting metal powder and a binder to a cavity filled with the POM screw mould core, and then heating and meltingthe POM screw mould core to prepare the MIM injection molding blank with an internal threaded hole; (3) degreasing: degreasing the MIM injection molding blank with the internal threaded hole by usinga catalytic degreasing technology; (4) degreasing the MIM injection molding blank with the internal threaded hole by adopting a vacuum sintering technology; and (5) carrying out inspection. The process not only can solve the pr
Bibliography:Application Number: CN201911008063