The process of manufacturing mobile phone parts using Metal Injection Molding (MIM)
Published Time:
2024-12-13
Metal Injection Molding (MIM) is a process that removes the binder from the formed blank using chemical or thermal decomposition methods, and then uses sintering to densify the product.
Metal Injection Molding (MIM) is a manufacturing technique for phone components that combines the advantages of plastic injection molding and powder metallurgy. The following is the MIM process for manufacturing phone parts:
1. Raw Material Preparation: Fine metal powders (such as stainless steel, titanium, etc.) are mixed with a thermoplastic or wax binder in precise proportions. This step is usually carried out in specialized mixing equipment, heated to a certain temperature to melt the binder, and mechanical mixing ensures that the metal powder particles are uniformly coated with the binder, forming granular raw materials suitable for injection molding.
2. Injection Molding: The granular raw materials are fed into an injection molding machine, heated, and injected into the mold cavity under high pressure to form a prototype of the desired shape. The mold can be designed with multiple cavities to improve production efficiency, while considering the shrinkage rate of the metal parts during sintering.
3. Debinding: The binder is removed from the parts through physical or chemical methods, resulting in parts made of pure metal powder. This step is crucial for the subsequent sintering process.
4. Sintering: The debinded parts are placed in a high-temperature, high-pressure controlled furnace and slowly heated under gas protection to fuse the metal powder particles and form a dense solid. This step determines the final density and mechanical strength of the parts.
5. Post-processing: According to customer needs, the sintered parts undergo shaping, machining, electroplating, painting, and other surface treatments to meet the final usage requirements.
MIM technology can manufacture high-precision, high-density, three-dimensionally complex phone parts, such as metal card trays, and is an indispensable technology in the mobile phone manufacturing industry.
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