Co-sintering molding technology of MIM (metal injection molding) blank and metal product

Abstract

The invention discloses a co-sintering molding technology of an MIM (metal injection molding) blank and a metal product. The technology comprises steps of preparation of the MIM blank, selection of the metal product, assembly, catalytic degreasing, sintering and discharging, wherein catalytic degreasing comprises procedures of preliminary washing, catalysis, secondary washing and post-washing, and sintering comprises negative pressure degreasing, vacuum sintering, partial pressure sintering and forced cooling. With the adoption of the molding technology, the technology is advanced, the process is simple and easy to control, existing degreasing sintering equipment can be used directly, great convenience is brought to production, labor and materials are saved, the production efficiency is substantially improved, the appearance of a prepared finished product is free of any abnormalities and defects, and the finished product is attractive and elegant in appearance, stable in quality, compact and uniform in structure, high in binding force, high in impact toughness and not prone to cracking, has the advantages of high mechanical bearing capacity and good perdurable stability and has the better economic benefit and the good application prospect.

Description

technical field [0001] The invention relates to the technical field of metal injection molding, and specifically relates to a joint sintering molding process of MIM injection molding blanks and metal products. Background technique [0002] The MIM process is the metal injection molding process, which is a molding method in which the plasticized mixture of metal powder and binder is injected into the model. The process step is to select the metal powder and binder that meet the requirements, and then The powder and the binder are mixed into a uniform feed by appropriate method at high temperature, and after granulation, it is injected into a semi-finished product through a mold, and then undergoes catalytic degreasing and high-temperature sintering to become a densified MIM injection molding blank. The MIM injection molded blank prepared by the above method has the advantages of uniform internal structure, high density, good product surface finish, high dimensional accuracy a...

AI Technical Summary

Problems solved by technology

However, the prepared MIM injection molded blank is only a single part, and it needs to be connected and assembled with other parts to make a complete finished product. However, when connecting and assembling MIM and metal products, it is inevitable to use tin Welding, laser welding, resistance welding and other welding connection methods make it fixed and connected. The above welding connection methods will not only leave weld scars on the welded parts, but also produce welding slag splashes when the metal melts at high temperature, which is easy to splash to the solder joints. At the same time, this welding method also has the characteristics of low welding strength, high welding process cost, and poor welding stability. The sales rate of the produced products is low after they are put into the market.