Plastic mold material selection

Plastic products are increasingly used in daily life, and Injection Molding technology accounts for about 80%. Injection molding is widely used in automobiles, construction, Household Appliances, food, medicine and many other fields due to its one-time molding, precise dimensions, insertable inserts, high productivity, easy modernization, and low post processing. The selection of plastic molds is critical for the economic benefits of plastics industry. Therefore, it is necessary for mold designers to understand the basic requirements of mold materials and choose the right materials.

The working conditions of plastic molds are different from those of cold stamping molds. Generally, they must be operated at 150°C-200°C. In addition to a certain pressure, they also have to withstand the effects of temperature. According to the different conditions of use of plastic forming molds and processing methods, the basic performance requirements of Plastic Mold steel are summarized as follows:

The hardness of plastic mold is usually below 50-60HRC, and the heat-treated mold should have enough surface hardness to ensure that the mold has sufficient rigidity. In the work of the mold due to plastic filling and flow to withstand greater pressure stress and friction, requiring the mold to maintain the shape of the accuracy and dimensional accuracy of the stability, ensure that the mold has a sufficient life. The wear resistance of the mold depends on the chemical composition of the steel and the hardness of the heat treatment, so increasing the hardness of the mold is beneficial to improve its wear resistance.

Excellent cutting workability

Most Plastic Molding molds, in addition to CNC processing, also require a certain amount of cutting and fitter repairs. In order to prolong the service life of cutting tools, improve cutting performance, and reduce surface roughness, the hardness of steel for plastic molds must be appropriate.

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