Advantages of adopting breathable steel for MIM processing

Advantages of adopting breathable steel for MIM processing

Breathable steel is a kind of fine spherical powder stainless steel sintered at high temperature, and its interior is evenly covered with tiny exhaust holes in all directions, also known as porous materials or porous metals. It can be used in injection molding or injection molding to solve the problem of trapped air.

In MIM parts, molten materials will produce a certain amount of gas due to high temperature during mold filling. If these gases cannot be discharged during mold filling, they will cause trapped gas, which will cause bubble defects in the injection molding blanks and affect the strength of the finished products. People use the characteristics of breathable steel to make use of it in the MIM part mold, which can effectively improve the exhaust problem.

In addition to smooth exhaust, the use of breathable steel in the MIM part mold has many advantages. Now let's introduce to you:

1、 The injection pressure can be reduced, and the molding and pressure holding time can be reduced. MIM parts made of breathable steel have good air permeability. During mold filling, the resistance generated is small, so only a small injection pressure is required for smooth mold filling.

2、 It can reduce and eliminate the internal stress of formed parts and prevent the deformation and warping of products.

3、 It can reduce the clamping force of the injection molding machine and prolong the service life of the mold and related equipment accessories. The smaller the injection pressure is, the smaller the clamping force is required. The stress generated by the use of breathable steel mold during injection is small, so it is not easy to produce die expansion, which greatly extends the service life of the mold and parts.

Mim parts processing and manufacturing

4、 Because of the close fit of the parting surface of the die, the difficulty in opening the die can be solved. It solves many problems such as the inability to provide sufficient surface area to accommodate a large amount of gas that may be generated by using ejector pins, inserts, etc., and avoids flash and other defects caused by using parting surfaces or other exhaust systems.

5、 It can reduce forming defects. The defects such as the gas generated by the high temperature of the molding material and the scorch, flow mark, lack of material, and the deformation of the parts caused by the gas suction in the mold cavity can be fully solved. The difficult forming problems such as gate offset, wall thickness unevenness and thin wall products are solved and alleviated.

6、 It can greatly reduce injection time, improve forming efficiency, save energy consumption and reduce production cost.

To sum up, the use of breathable steel in the mold manufacturing of MIM parts can reduce production costs and speed up the manufacturing process of MIM parts, so it has been widely used by mold manufacturers.