MIM-Metal Injection Molding

MIM (Metal Injection Molding) is a process used to manufacture metal components of varying complexity by injecting a mixture of metal powder and thermoplastic polymer binder, known as “Feedstock.” This mixture is processed into granules and then injected into a mold.

Debinding, or the removal of binders, can be done either thermally or chemically, and this process can take up to 24 hours. Sintering is then performed in a furnace, either continuously under a protective atmosphere or under vacuum.

MIM uses equipment similar to that used in plastic injection molding. This technology is particularly well-suited for the production of medium to large series of parts with complex geometries.

At Porite, we began manufacturing MIM parts in Taiwan in 1996. Our main sectors of activity include power tools, electronics, automotive, and mechanical industries. We inject various types of materials, primarily iron and stainless steel powders.

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The process

An alternative to other technologies

Advantages of MIM

• Production of complex parts: Enables the manufacturing of complex geometries that are difficult to achieve with other methods.
• Reduced machining operations: Unlike other technologies, such as lost-wax casting, MIM minimizes the need for additional machining.
• High density: Achieved from 95% to 98%, ensuring mechanical properties close to those of solid metal.
• Improved surface treatments: Better adhesion of anti-corrosion surface treatments compared to traditional sintering.
• Possibility of direct tapping or threading: Allows these operations to be integrated directly during injection, reducing production steps.
• Great design freedom: Allows for the design of components with highly varied and complex shapes.
• Excellent dimensional tolerances: Precise tolerances of around +/- 0.5%, ensuring high manufacturing accuracy.

These advantages make MIM an ideal technology for producing high-quality parts at competitive costs.