Overview of powder injection molding:
Powder Injection Molding (PIM) consists of two parts: Metal Injection Molding (MIM) and Ceramics Injection Molding (CIM). It is a new type of metal and ceramic parts preparation. Technology, it is a brand-new part processing technology formed by introducing plastic injection molding technology into the field of powder metallurgy. The basic process steps of MIM are: first select the metal powder and binder that meet the requirements of MIM, then use an appropriate method to mix the powder and binder into a uniform feed at a certain temperature, and then injection molding after granulation to obtain the shape The blank is sintered and densified after degreasing treatment to become the final product.
Features of powder injection molding technology:
Powder injection molding can produce metal and ceramic parts with complex shapes at one time, just like plastic products. This process technology uses the injection method to ensure that the material fills the mold cavity, which also ensures the realization of the highly complex structure of the part.
1. Compared with traditional machining and precision casting, the internal structure of the product is more uniform; compared with traditional powder metallurgy pressing/sintering, the product performance is more excellent, the product size is high, and the surface finish is good. A small amount of finishing is required. The metal injection molding process can directly form thin-walled structural parts. The shape of the product can be close to or meet the requirements of the final product. The dimensional tolerance of the parts is generally maintained at the level of ±0.10%～±0.30%, especially for reducing hard alloys that are difficult to machine. Processing costs and reducing processing losses of precious metals are particularly important.
2. High degree of freedom of geometric shapes of parts, uniform density of each part, high dimensional accuracy, suitable for manufacturing small parts with complex geometric shapes, high precision and special requirements (0.2～200g).
3. The product quality is stable, the performance is reliable, the relative density of the product can reach 95% to 100%, and it can be carburized, quenched, tempered and other heat treatments.
4. Wide range of applicable materials, wide application fields, high utilization rate of raw materials, high production automation, simple procedures, and continuous mass production. The production process is pollution-free and is produced in a clean process. The molds used in MIM technology have a lifespan similar to that of plastic injection molding molds. Because the injection molding machine is used to form the product blank, the production efficiency is greatly improved, the cost is reduced, and the injection molded product has good consistency and good repeatability, thereby providing a guarantee for large-scale and large-scale industrial production.
5. The product has uniform microstructure, high density, high product strength, hardness, elongation and other mechanical properties, good wear resistance, fatigue resistance, uniform structure and good performance. MIM is a fluid forming process. The presence of the binder ensures the uniform distribution of the powder, which can eliminate the uneven microstructure of the blank, and then make the density of the sintered product close to the theoretical density of the material, thereby increasing the strength, toughness, and ductility. , The electrical conductivity and thermal conductivity are improved, and the overall performance is improved.
Features of MIM technology: Compared with traditional technology, MIM technology has the characteristics of high precision, uniform organization, excellent performance, and low production cost. Its products are widely used in electronic information engineering, biomedical equipment, office equipment, automobiles, machinery, and hardware. , Sports equipment, clock and watch industry, weapons, aerospace and other industrial fields.
