Advantages of MIM

Metal Injection Molding (MIM) is a near-net-shape process for manufacturing complex metal parts in large quantities. The MIM process competes with traditional machining processes, press sintering and fine casting. Compared to machining or press sintering of simple, rotational symmetric geometries, MIM has certain cost disadvantages. The innovative process, on the other hand, is obviously advantageous when large quantities meet complex geometries or special material properties with high precision are required. Furthermore, this technology reduces post-processing to a minimum.

mim im vergleich e

mimplus vorteileGreat freedom in design

The MIM process offers a design freedom known from the plastics industry. Drill holes, threads or labels, such as logotypes, can be easily integrated into the MIM tool and enable near-net-shape parts directly out of the tool. Entire assemblies, which until now could only be produced by the assembly of several components, can be produced in a single process using MIM technology.

mimplus materialeigenschaftenExcellent material properties

Sintered MIM components have a homogeneous structure with densities > 97% and are free of residual stress. The density of the parts is homogeneous and gradient-free in contrast to sintered parts from press sintering process. The mechanical properties are well comparable to those of the rolled material.

hohe oberflaechenqualitaetHigh surface quality

The surface roughness of MIM parts is better than that of fine castings. A roughness of Ra = 4 µm is easily achievable without additional grinding or polishing steps. In case there is a need for higher surfaces qualities, post-processes such as grinding, vibratory grinding and polishing can be applied. An even high-gloss surface can be realized on the poreless surface of MIM components.

mim enge toleranzTight tolerances

The MIM process simultaneously enables tight tolerances when maintaining an excellent reproducibility. The minimum tolerances are ± 0.05 mm for geometries that are < 3 mm. For larger parts (> 60 mm), the rule of thumb for the tolerance is 0.5 % of the nominal dimension.

verfuegbare materialienAvailable materials

A wide range of materials is available for the metal injection moulding process. Almost every alloy available as a powder can be processed. MIM technology is particularly beneficial for difficult-to-machine or expensive materials. Standard materials for series production in the portfolio of MIMplus Technologies are stainless steels, low-alloy steels, tool steels, soft-magnetic alloys and also such light metals as titanium. In addition, we offer nickel-base alloys, carbides and copper. Our research and development department focuses on the development of innovative and new MIM materials, which are not yet available. These include permanent magnetic alloys (e.g. NdFeB) or complex composite materials.

wirtschaftliche aspekteEconomical aspects

As shown in the diagram above, MIM is particularly relevant for components with a high geometrical complexity at a large scale, since this is a tool-related process and the costs for the mould are amortised over the number of produced parts.

This net-shape process is economically very attractive for high-cost materials, as no waste is generated during the moulding process. “Green parts” that have been produced during start cycles as well as sprue can be regranulated and reused with no loss of the quality. This makes MIM an environmentally friendly process.

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