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MIM process foundation problem solving

Categories: FAQStars: 3StarsVisit: -Release time: 2019-09-30 08:30:00
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1. What is MIM technology?

MIM is known as metal Injection Molding. The utility model relates to a manufacturing technology integrating plastic injection molding process and traditional powder metallurgy.

  

2. How does MIM work?

Fine metal powders are combined with thermoplastics and adhesives to form a material that is essentially plastic particles containing metal powders and adhesives. Then, through injection molding method that everyone is familiar with, green part of required product is formed. It is then processed to remove binder (called de-binding), and finally de-bind product is heated and sintered in a controlled high temperature environment to produce dense metal parts.


3. Did metal melt in molding process?

No, only adhesive melted. This allows the powder to flow like plastic. Cooling adhesive is a component with certain strength. Then through de-binding and sintering to remove binder, achieving high density and strength to meet their mechanical properties.


4. Do parts shrink when adhesive is removed?

No, volume of parts will not change during de-binding. However, up to 20% deformation occurs during sintering.


5. What will be density and strength of MIM part?

The density of a typical MIM is theoretically higher than 96%. The specific density characteristics depend on choice of alloy, but it is close to precise material in any case.


6. Why use MIM?

MIM has advantage of making sophisticated, highly complex components that are difficult or cost prohibitive to produce using traditional machining or casting techniques.


7. What materials can be used for production?

Almost all metal alloys can be used in MIM processes. Among types of materials commonly used in MIM, typical alloys include high-strength steel, nickel-added stainless steel, and super alloys. Other materials include refractory alloys, titanium and copper alloys, low melting point alloys including brass, bronze, zinc and aluminum, but are not economical to use in MIM processes.


8. What is best way to achieve MIM benefits?

Applying MIM technology is best way to achieve MIM benefits early in design phase of product production cycle.


9. Delivery cycle?

Typical lead time for processing and submission of samples is 8-10 weeks. But according to specific engineering requirements can shorten corresponding delivery cycle.


10. What is annual output?

In general, the average annual output of a typical product should exceed 500K.


11. Are there any restrictions?

Like any other technology, MIM technology has limitations, with a maximum weight limit of 240 grams (from an economic point of view, it is generally limited to no more than 50 grams). Certain geometric properties can be problematic (too thick or too thin sections). The progress of process in these years makes maximum weight of MIM products continuously break through.


12. What tolerances will be made?

Typical MIM tolerances range from 0.3% to 0.5%. However, depend heavily on geometry of product. Exceeding MIM technical tolerances can be achieved by machining.


13. What equipment is used in process?

MIM process mainly uses following equipment: MIM mixing & granulation machine, MIM injection molding machine, MIM de-binding machine, MIM sintering machine, and MIM post-processing machine.


14. Can MIM be heat treated or electroplated?

Yes, MIM parts can be heat treated, electroplated, machined, forged, PVD vacuum plated, just like traditional machined products.


Keywords in the article: MIM Metal Injection Molding
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