...........258.5导柱与导套的配合形式..........................................................................25第九章成型零件的设计..................................................................................279.1成型零件的选材......................................................................................279.1.1加工..................................................................................................279.1.2抛光..................................................................................................279.1.3计算..................................................................................................279.2导柱长度的计算......................................................................................289.4模塑的工艺规程的编制........................................................................29