Everything You Should Know About MIM Casting Process

MIM casting fuses the versatility and cost savings of traditional plastic injection molding. In addition, it adds the robustness and endurance of metal.

Well, it is very crucial to choose the right Metal Injection Molding Materials for the stability and durability of the finished product. Overall, Metal injection molding is a process akin to the plastic injection molding in which molten metal is injected into a cast and solidified part to construct the metal part. It helps to create a small and intricate metal parts around 1–100 grams.

This article explores the advantages of MIM Casting and everything you should know about the process:

What Is Metal Injection Molding?

Metal injection molding or Powder injection molding is a process whereby a powdered metal feedstock is used in the injection molding process in order to create the intricate metal parts. Then, the metal pellets are molded into the part shape before rebinding and sintering.

How Does It Work?

Mental injection molding works through injecting a feedstock of metal into pellets. The manufacturers use an organic binder at high pressure and temperature — then it turns the feedstock into molten metal. Later, the metal cools and solidified in the mold — then it can be removed.

Materials Used in The MIM Casting Process

It is very crucial to choose the right material before casting. Well, the choice of material completely depends on the application of the product. Typically, the materials in the metal injection molding are divided into four different categories.

• Ferrous Alloys: It includes steel, Stainless Steel, tool steel, iron-nickel alloy, invar and kovar.

• Tungsten Alloy: It includes cobalt, chromium, cemented carbides and cermets

• Special Metals: It includes aluminum, titanium, nickel and molybdenum

Pure tin metal cannot be used for metal injection molding. They can be used as an alloying element to copper alloy injections. In order to make intricate and small geometric parts out of tine one needs to add die casting.

Advantages of Metal Injection Molding

MIM has many advantages including:

Helps to Create Complicated Geometric Parts

MIM excels at crafting components with internal structures and complex shapes enabling the creating of both function and visually appealing parts.

Cost-Effective

MIM casting is considered as a considerable cost-effective solution due to less labor requirements and minimal waste generation. Since it is done by extensively automated technique — it can lessen the requirement of human labor.

The primary reason of using metal injection molding is to create small metal parts with complex geometry in high volume. It helps to create parts that do not require machining and is more cost-effective process than forging, and casting. Typically, this process is used in weapon, automotive, aerospace, electronics, telecommunication, medical and dental industries.