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收缩对塑料模的影响,如凹痕、气泡、翘曲、残余应力和应力裂纹等,是注射加工者和模具制造厂共同面临的问题。对机床进行最佳的调整往往可以减少这类缺陷。但是无法补偿模具设计和模具结构上的错误。除了设法避免这些影响所引起的质量缺陷外,最主要的是确定成形过程的收缩量,以便规定收缩余量,以避免由于塑件尺寸误差而引起价格昂贵的模具整修工作。近来判断收缩率影响的方法仍依赖于经验值和原材料供应厂的数据。这就需要进行大量
Shrinkage on the plastic mold effects, such as dents, bubbles, warping, residual stress and stress cracks, injection processors and mold manufacturers are faced with the problem. The best adjustments to the machine often reduce this type of defect. But can not compensate for mold design and mold structure errors. In addition to trying to avoid these quality defects caused by the impact, the most important thing is to determine the amount of shrinkage in the forming process, in order to set the shrinkage margin, in order to avoid the dimensional errors caused by the plastic parts expensive mold renovation work. The recent method of determining the effect of shrinkage still depends on empirical data and raw material supply plant data. This requires a lot of work