How to Choose Plastic Mold Steel

Among the manufacturing costs of plastic molds, processing and polishing account for 70% to 80%. Therefore, when selecting mold steel, it is necessary to improve the processing performance of the molds while ensuring the performance requirements of the molds.

The selection method can be carried out as follows:

1. according to the type and quality requirements of plastic products.
2. According to the production batch of plastic parts. When other factors are determined, the smaller the production batch is, the lower the wear resistance and service life requirements of the mold will be. Therefore, steel with low performance can be selected. For small batches, quenched and tempered steel or carbon steel can be used. For medium batches (300,000 to 1 million shoting), P20, 5NiSCa, SM2, etc. can be selected; for larger batches, 5NiSCa, PMS, etc.
3. Select according to the size and accuracy requirements of plastic parts. For large-scale high-precision injection molds, like plastic cap mold , when the production volume of plastic parts is large, pre-hardened steel is used to prevent heat treatment deformation.
4. Select according to the complexity of plastic parts. Mold maker should fully consider the processing technology of the mold, try to choose materials that are easy to cut, and it has small heat treatment deformation and good wear resistance.