NEWS
23
2022
-
05
Introduction to the production process of powder injection molding
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With the acceleration of technological progress and innovation, products are gradually developing in the direction of miniaturization and miniaturization, which greatly drives the development of microfabrication technology. Compared with other microfabrication processes, powder injection molding technology has the advantages of a wide range of materials, complex shapes, easy mass production, and precision and microstructure parts.
Powder injection molding can be divided into ceramic powder injection molding and metal injection molding
Powder injection molding process: feed preparation, injection molding, debinding and sintering
1. Feeding preparation is the most critical step, because the defects introduced by this step cannot be eliminated in the subsequent process. Among them, the binder, as the core part of the feeding, directly affects the uniformity of the feeding and the quality of the formability, which in turn affects the progress of the subsequent process and the performance of the final product.
2. The injection molding process can be simply described as: first heat the feed material to the melting temperature, then pressurize the melt into the mold cavity, and cool it in the mold cavity to form.
3. Since the emergence of MIM technology, with the different binder systems, a variety of MIM process paths and degreasing methods have been formed. Degreasing time has been shortened from the first few days to the current few hours. From the degreasing step, all degreasing methods can be roughly divided into two categories: one is the two-step degreasing method. The two-step degreasing method includes solvent degreasing + thermal degreasing, siphon degreasing - thermal degreasing, etc.
4. Sintering is the last step in the MIM process, and sintering eliminates the pores between the powder particles. Make MIM products reach full densification or close to full densification. Due to the use of a large amount of binder in the metal injection molding technology, the shrinkage during sintering is very large, and the linear shrinkage rate generally reaches 13%-25%, so there is a problem of deformation control and dimensional accuracy control.
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