Precision injection mold characteristics and requirements

Precision injection molding generally refers to the precision and surface quality of forming parts are demanding process, there are also people who believe that precision of the precision injection refers to the size of the plastic injection molding technology of 0.01 ~ 0.001 mm. In recent years, with electronic, medical, communications, automotive and other industries, the rapid development of high precision, high performance requirements of plastic products is growing, the traditional plastic molding process has been difficult to meet the requirements of the current high standards, at the same time, the injection molding is one of the most important plastic molding method, therefore, precision injection molding technology is getting more and more get the attention of the people, make the precision injection molding technology constantly progress, new technology constantly emerging. Factors influencing the precision of injection molding precision injection molding for products not only has high dimensional precision, lower buckling deformation, good transfer characteristics, but also should have excellent optical performance, etc

As a result, it for injection molding machine, mold, injection molding technology, performance and the formula of raw material all have special requirements, such as there are many factors which can affect the precision injection molding. According to the actual production, the influencing factors of precision injection molding mainly has the following several aspects:

(1) design of precision plastic products, plastic shrinkage rate should take into account the shrinkage rate of plastic. Tolerance grade precision injection products can be according to the SJB72-7.8 - the two tolerance grade 1 and 2

2) plastic products shape and size of the product size and shape accuracy have great influence, the production practice shows that the more products the more complex shape and size, its precision is low

(3) the precision of plastic parts and mould structure mold cavity number and production batch is closely related. Also shows that the precision of the single cavity mould structure is higher than multi-cavity mould structure, the precision of the small batch production is higher than mass