MIM Process

Metal Injection Moulding (MIM) is a metal working process containing four steps: compounding, injecting, debinding and sintering.

Atomized metal powders are being compounded with a binder material to create a feedstock. The feedstock is processed by using injection moulding. The moulding process allows to produce complex parts in high volumes within tight tolerances as well as thin walls and excellent surfaces.

Feedstock

The Feedstock consists of fine metal powders with less than 25 Micrometer particle size which are mixed with thermoplastic and wax binders in special mixing equipment. The compounding is finished when the metal particles in the binder are fully homogenized. During the mixing process the mass is being heated. After the completion of the process the material is granulated into pellets while cooling down.

Injection

In this process step the feedstock is injected into a mould under high pressure using conventional injection moulding machines. In this way MIM combines the advantages of design freedom that comes with plastic injection moulding with the excellent mechanical and thermal characteristics of metallic materials. Depending on the complexity of the parts and the desired quantities, the moulds have up to 32 cavities. 

The result of the injection is the so called "greenpart" which is at an average 20% larger than the final part.

Debinding

Depending on the binder system debinding can be done catalytically, thermally or by solvent. The binder is hereby removed from the component except of a rest binder content of 2 to 3 percent. This backbone guarantees stability of the "brownpart" for the subsequent process. 

Sintering

In the last step the components are sintered at temperatures between 1200°C and 1400°C depending on the material. During this step the remaining binder is completely removed. During sintering the parts shrink isotropically to their desired dimensions. Sintered parts have densities of >97% and have thus similar characteristics to parts created using cutting technologies.

Post Processing

In some cases finishing operations are necessary. MIM parts can be heat treated as any other metal parts and they can also be further processed with any type of machining operations to achieve tolerances that are more precise. OBE offers a broad range of post-processing technologies like cutting, hardening, laser technologies, surface technologies including assemblies.

Production Support

Tool Shop

Fully equipped tool shop and engineering department for design, process simulation and manufacturing of injection moulds.

 

Machine shop

In-house design and manufacturing of dedicated production equipment, ranging from jigs to fully automated special purpose (e.g. calibration, assembly) machines.

 

Laboratory

Fully equipped metallographic laboratory to evaluate micro structure, carbon content, density, hardness and more.

Lab-scale and small quantity feedstock production.

 

Quality Assurance

Comprehensively equipped with state of the art measuring equipment (tactile and optical) for dimensional and surface quality.

Quality Management system according to ISO 9001:2015 and ISO 16949 installed.

 

© 2019 by MIMplus Technologies GmbH & Co. KG, Deutschland

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