What are the types of plastic die steel, how to choose plastic die steel
What are the types of plastic die steel, how to choose?
In the forming mold of plastic mold parts, the quality requirements such as the type of plastic to be pressed, the batch of production, the complexity of the workpiece, the dimensional accuracy and the surface roughness are the main factors for determining the steel used in plastic mold. According to different requirements for the wear resistance, corrosion resistance, heat resistance, pressure resistance, magnetic properties, micro-deformation and mirror polishing properties of plastic mold steel have different requirements, according to their differences in use, can be roughly divided into the following types:
1. Universal plastic die steel
2. Wear-resistant plastic die steel
3. Carburized plastic die steel
4. Corrosion-resistant plastic die steel
5. High mirror plastic die steel
6. Non-magnetic plastic die steel
7. Pre-hardened easy cutting plastic die steel
Universal plastic die steel, used for the production of universal plastic (such as polyethylene, polypropylene) workpiece mold.
So, how to choose plastic die steel when making molds?
When the production batch is small, the dimensional accuracy and surface roughness have no special requirements, and the mold section is not large, the general selection of 2311 mold steel, P20 mold steel when the production batch is large, the mold size is large or the shape is complex, and the precision requirements are high, the general selection of P20H mold steel, 738H mold steel, 718H mold steel;
Wear-resistant plastic die steel, in order to produce molds for strengthening engineering plastic products (such as thermoplastic engineering plastic products with fiber reinforcement) and thermosetting plastic extrusion forming, die steel with good wear resistance is used. When the production volume is large, H13 mold steel, Cr12MOV mold steel, D2 mold steel are used after quenching and tempering. In order to improve wear resistance, surface treatment can be performed
Corrosion resistant plastic die steel, used for the production of polyvinyl, fluorinated plastics, adding positive flame retardant plastic die, because in the pressing process of mold contact with corrosive media, should be selected corrosive plastic die steel; Such as 4Cr13 mold county steel, 2Cr13 mold county steel, 3Cr13 mold county steel, 2083 mold county steel, S136 mold county steel, after quenching and tempering.
High mirror plastic die steel, pressing plastic products with low precision and surface roughness values, such as optical instrument parts, household appliance parts, etc.
The roughness of the surface of the forming die cavity is very low, and it is necessary to use a high purity and density die steel, which is often used after electroslag remelting or vacuum consumable electrode remelting alloy die steel.
The above is the type and selection method of plastic die steel, and I hope it will be helpful to you.
