Plastic molds for household appliances are made of plastic injection molding, mainly made of special steel, which contains multiple components such as pouring system, injection system and cooling system. The output of plastic molds for household appliances refers to several cavities in a set of molds, that is, several identical or different parts can be molded simultaneously in one mold injection molding cycle. The output of the same part will affect the output of plastic molds. The larger the output, the greater the daily output of plastic molds. But the amount of output will affect the cost of the mold and the processing cost of the product. The greater the output, the more complicated the plastic mold manufacturing, and the greater the demand for plastic molds, the higher the cost of plastic molds. In addition, the injection processing fee of each product = the injection processing fee of each product / the output of the mold. Therefore, the greater the output of plastic molds, the lower the cost of injection processing of individual products. But this ratio is not directly proportional, because the more plastic molds produced, the larger the plastic molds, the greater the demand for injection molding machines, the higher the processing cost of each plastic mold. Therefore, it is a better method to determine the actual output of the mold according to the actual order quantity of the customer.
The hardness of plastic molds for household appliances is generally below 50-60hrc. After heat treatment, the mold should have sufficient surface hardness to ensure that the mold has sufficient rigidity. Because plastics need to withstand greater pressure stress and friction during mold filling and movement, the mold must adhere to the fluctuation of shape accuracy and dimensional accuracy to ensure that the mold has sufficient service life. The wear resistance of the mold depends on the chemical composition of the steel and the hardness of the heat treatment. Increasing the hardness of the mold is beneficial to improving the wear resistance of the mold. The plastic mold parts of household appliances have complicated shapes and are difficult to process after quenching. Therefore, it is necessary to select components with good thermal wave dynamic performance as much as possible. After the heat treatment of the mold, due to the small linear shrinkage coefficient, small heat treatment deformation, metallurgical structure and mold size fluctuations, the mold size change rate is small, and the processing can be increased or no longer stopped. The mold can ensure the dimensional accuracy and surface roughness requirements.
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