以Index clip(索引夹)塑件为载体,根据塑件在成型过程中的收缩特性,对Index clip塑件的结构及壁厚尺寸进行设计。通过构建塑件脱模推出时的受力平衡方程,进行塑件收缩应力分析,并转化为塑件抱紧力与脱模推出力关系的计算,再由抱紧力计算出塑件的收缩应力。24 h不同厚度A4纸的夹紧试验结果显示,该Index clip塑件能够长时间夹紧3张以内的A4纸。 Taking Index clip as the carrier, the structure and thickness of the Index clip are designed according to the shrinkage characteristics of the plastic during the forming process. By constructing the force balance equation when the plastic parts are released, the shrinkage stress of the plastic parts is analyzed and converted to the calculation of the relationship between the tightness of the plastic parts and the ejection force of the mold parts. Then, the shrinkage stress . The results of 24 h clamping tests on A4 paper of different thicknesses showed that the Index clip was able to clamp up to 3 sheets of A4 paper for a long time.