Advantages of Metal Powder Injection Molding Process for Manufacturing MIM Mobile Phone Accessories

There are many kinds of molding processing technologies for metal parts processing, among which MIM powder metallurgy processing is widely used in mobile phone parts.

MIM powder metallurgy injection molding technology is a new type of powder metallurgy near-net forming technology formed by combining modern plastic injection molding technology with traditional powder metallurgy process. Among them, mobile phone parts MIM powder metallurgy parts have high product dimensional accuracy (±0.1%~±0.5%), good surface finish (roughness 1~5μm), and very large output.

Advantages of MIM powder metallurgy process in mobile phone parts

.Extremely high design freedom.

Compared with other metal molding methods, MIM powder metallurgy injection molding can manufacture more complex parts. Basically, all structures that can be achieved by injection molds can be used in MIM powder metallurgy injection molding.

.Almost all metal materials can be used.

Considering the economy, the main application materials of MIM powder metallurgy injection molding include iron-based, nickel-based, copper-based, titanium-based metals or alloys.

.Because the sintering density is very close to the theoretical density, the physical and chemical properties of MIM powder metallurgy injection molding are also very good, such as mechanical strength, which greatly exceeds traditional powder metallurgy.

.The surface roughness (Ra) of the sintered blank of MIM powder metallurgy injection molding can reach 1μm, and a dazzling appearance can be obtained through various surface treatment methods.

.MIM powder metallurgy injection molding can generally achieve a tolerance accuracy of ± 0.5%. In combination with other processing methods, MIM powder metallurgy injection molding can achieve higher dimensional accuracy.

.MIM powder metallurgy injection molding can flexibly adjust and quickly increase production, and can respond quickly from hundreds of pieces per day to hundreds of thousands per day.

The raw material utilization rate of MIM powder metallurgy injection molding is close to 100%, which is a near-net forming technology that can effectively avoid material waste.

The process of manufacturing MIM mobile phone accessories by metal powder injection molding process

01 Rubber refining: Metal powder and binder are mixed in a certain proportion to form a uniform feed. The binder used in MIM technology has the function of enhancing powder fluidity and maintaining the blank shape.

02 Injection molding: Through injection molding, the feed is injected into the mold at high temperature, high pressure and high speed. The feed flows into the mold cavity through the water inlet (the number of mold cavities is designed according to the structural characteristics of the product to improve production efficiency), and the injection blank is formed after compaction and cooling. The blank has a certain strength and density. At Dahong New Materials, the design of the mold cavity must take into account the shrinkage ratio of the blank after sintering, and the shrinkage ratio varies according to the material composition.

03 Degreasing: After degreasing, 98% of the binder of the blank will be removed, leaving only 2% to maintain the blank shape. When degreasing is taken out of the furnace, the metal powder injection molding manufacturer will draw samples for destructive testing. If the powder is relatively soft when the blank is chopped, it means that the degreasing is qualified. If there are hard lumps when it is cut out, it means that the degreasing standard is not met.

04 Sintering: After sintering for 24 hours, the remaining 2% of the binder is completely removed. The sintered product has high density and good mechanical and physical properties. Post-sintering processing is the process of metal injection molding (MIM) to manufacture mobile phone accessories.

With the development of the economy, the market needs to produce lighter, thinner and more beautiful mobile phones. It is necessary to use advanced metal powder injection molding technology to reduce the size and weight of mobile phone accessories. Metal powder injection molding (MIM) is suitable for manufacturing MIM mobile phone accessories.