The working condition of the CNC plastic prototyping is different from that of the cold die. Generally, it must be operated at 150°C-200°C. In addition to being subjected to a certain pressure, it must also withstand the temperature influence. Let's take a look at the material requirements for plastic molds!
1. Sufficient surface hardness and wear resistance
The hardness of the plastic mold is usually below 50-60HRC, and the heat-treated mold should have sufficient surface hardness to ensure the mold has sufficient rigidity. The wear resistance of the mold depends on the chemical composition of the steel and the heat treatment hardness, so increasing the hardness of the mold is beneficial to improve its wear resistance.
2. Excellent machinability
Most plastic molding dies to require a certain amount of cutting and fit repair in addition to EMD processing.
3. Good polishing performance
High-quality plastic products require a small roughness value on the surface of the cavity. The steel material selected for this purpose requires fewer material impurities, fine uniformity of the structure, no fiber orientation, and no pitting or orange peel defects during polishing.
4. Good thermal stability
The shape of the parts of the plastic injection mold is often complicated, and it is difficult to process after quenching. Therefore, it should be selected with good thermal stability to ensure the dimensional accuracy and surface roughness of the mold.
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