What is the difference between injection molding and injection in metal injection molding?

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　　 Metal Injection Molding In injection molding, molten plastic is injected into the mold under the action of a plunger or screw, and the process involves forcing it into the mold cavity at high pressure.

　　Metal injection molding, also known as injection molding, is a forming process that combines both injection and shaping. This technology offers advantages such as rapid production, high efficiency, automated operation, a wide range of colors, and the ability to produce parts ranging from simple to highly complex in geometry and from large to small dimensions. Moreover, it delivers precise part dimensions, facilitates easy design updates, and enables the fabrication of components with intricate shapes. Metal injection molding is well suited for mass production and for manufacturing products with complex geometries.

　　At a specified temperature, the fully molten plastic material is stirred with a screw and then cooled to solidify, yielding a molded product. This method is well suited for the mass production of parts with complex geometries and is one of the key manufacturing processes.

　　Metal injection molding is a process in which molten plastic, heated in an injection molding machine, is injected into a mold under the action of a plunger or screw and then cooled to form the final part. It is a plastic‑processing method in which the plastic is plasticized in the heating barrel of an injection molding machine and then injected—via a plunger or reciprocating screw—into the cavity of a closed mold to produce the desired part. This technique can fabricate components with complex geometries and tight dimensional tolerances, as well as incorporate inserts, while offering high production efficiency. Most thermoplastics and certain thermosetting plastics (such as phenolic resins) are suitable for this process. Materials used in injection molding must exhibit good flow characteristics to ensure complete filling of the mold cavity and achieve the desired part.

Metal Injection Molding

　　So, what are the requirements for binders in metal injection molding?

　　Metal injection molding is a novel powder metallurgy forming process that adapts modern plastic injection molding technology to the field of powder metallurgy.

　　Metal injection molding not only features fewer process steps, minimal or no machining, and high economic efficiency, but it also overcomes the drawbacks of conventional powder metallurgy—namely, material inhomogeneity, low mechanical properties, and difficulties in forming thin-walled and complex structures. Metal powder injection molding manufacturers have found that MIM technology is particularly well suited for the mass production of small, intricate components as well as precision metal parts. The particle size of the metal powders typically ranges from 0.5 to 20 μm.

　　In theory, the finer the particles, the larger the specific surface area, and the easier it is to form and sinter; however, conventional powder metallurgy typically employs coarser powders. Several binders are used to agglomerate metal powder particles, imparting rheological properties and lubricity to the mixture as it is heated in the nozzle barrel—essentially serving as a carrier that facilitates powder flow.

　　Therefore, Metal Injection Molding The manufacturer has summarized several binder requirements for metal injection molding (MIM) technology:

　　1. Using a smaller amount of binder can improve the rheological properties of the mixture;

　　2. No chemical reaction with metal powders during the degumming process;

　　3. Easy to remove, with no carbon residue in the product.

Metal Injection Molding

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