Metal injection molding (MIM) powder mixing-pressing apparatus and process thereof

Abstract

The invention discloses a metal injection molding (MIM) powder mixing-pressing apparatus and a process thereof. The metal injection molding (MIM) powder mixing-pressing apparatus comprises a surface pressing drum and a material conveying mechanism; the material conveying mechanism comprises a conical discharge outlet, a screw pusher, a heating device and a feed inlet; the conical discharge outlet of the material conveying mechanism is located above the surface pressing drum; the heating device is mounted on an outer side surface of a transportation path of the screw pusher; two ends of the screw pusher communicate with the feed inlet and the conical discharge outlet, respectively; a product pressing method of the metal injection molding (MIM) powder mixing-pressing apparatus comprises a process of mixing powder, a process of heating, stirring and pre-extruding powder to form a strip-shaped powder agglomerated blank, and a process of pressing and molding the powder agglomerated blank; the metal injection molding (MIM) powder mixing-pressing apparatus and the process thereof are capable of effectively reducing cracks of powder pressed metal pieces, and materials of the pressed metal pieces have better uniformity and integrality, and bigger density; as a result, the physical properties of the pressed metal pieces are well improved.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy, in particular to powder injection molding (MIM) powder mixing and pressing equipment and a product pressing method. Background technique [0002] Metal Powder Injection Molding (MIM for short) technology is a new type of powder metallurgy near-net forming technology formed by introducing modern plastic injection molding technology into the field of powder metallurgy. The basic process is as follows: firstly, the solid powder and organic binder are evenly mixed, and after granulation, they are injected into the mold cavity with an injection molding machine in a heated and plasticized state to solidify and molded, and then chemically or thermally decomposed. The binder in the blank is removed, and finally the final product is obtained through sintering and densification. Compared with the traditional process, MIM has the characteristics of high precision, uniform structure, excellent per...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a powder injection molding (MIM) powder mixing and pressing equipment and process thereof with high relative density of molding material, uniform density distribution and no cracks, so as to solve the problem of metal powder in the prior art proposed in the above-mentioned background technology. Inhomogeneous mixing with plasticizers, uneven density distribution of injection products, and problems such as gap cracks and poor consistency

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