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FAQs

Common problems in plastic mold design?

In many industrial products, the requirements for the size and shape of the products are relatively high, so plastic mold designers are needed to make reasonable mold design using plastic to achieve the improvement of the production efficiency of industrial products However, in the process of designing the corresponding moulds, there are often some problems, such as different tolerance markings, different shrinkage rates and different cooling degrees of plastic moulds, which seriously affect the efficiency of plastic mould design First, the tolerance markings are not the same For different products, different proportions of plastic moulds are needed If the tolerance mark is low, the precision of plastic moulds is not high, and if the tolerance mark is high, the processing of plastic moulds is relatively complicated, therefore, in the process of designing plastic moulds, the first consideration is the plastic mould tolerance mark However, in the actual design process, there are still some designers choose the tolerance marking according to their experience, resulting in errors in the size and shape of plastic moulds, which affects the quality and reference value of plastic mould design Second, the shrinkage rate is different In the process of making plastic molds, it is necessary to melt the plastic into liquid under high temperature or high pressure conditions, and inject it into the corresponding cavity in the mold In the liquid plastic setting process, affected by the plastic itself characteristics, the size of its plastic mold will be slightly smaller than the mold cavity, this situation is shrinkage In the process of designing a plastic mold, the shrinkage must be taken into account, but some designers do not realize that different types of plastics have different shrinkage rates and cannot apply a uniform standard for shrinkage rate calculation Once the shrinkage rate is miscalculated, then the size of the plastic mold will also be affected Third, the coefficient of thermal expansion varies Different plastic materials have different coefficients of thermal expansion, and this coefficient of thermal expansion directly affects the shape and size of the plastic after cooling Therefore, in the design of plastic mold, the designer must take the coefficient of thermal expansion into account, and according to the actual situation, adjust the design size of plastic mold appropriately However, some designers do not strictly comply with the design process and ignore the utilization of

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