按材料和模塑条件确定塑料制品尺寸公差（Ⅰ）──影响因素与收缩特性

Determining the Dimensional Tolerance for Plastics Products Based on the Materials and Moulding Conditions(Ⅰ)──Influence Factors and Shrinkage Property

对于塑料制品，影响其尺寸精度的因素很复杂，不能简单套用金属制品的公差规律。笔者在大量实测数据的基础上，运用数理统计理论，对模塑制品尺寸公差的分布规律进行了研究，为制订模塑制品尺寸公差标准提供了依据。

The factors affecting the dimensional accuracy of plastics products are very complex.The dimensional tolerance characteristics which are suitable for metal products are not for plastics products. Based on a great amount of data from measuring, the distribution mode of dimensional tolerance for plastics products was investigated by using mathematical statistic method. It will provide a basis for making the dimensional tolerance standard for plastics products.