聚碳酸酯滚轮的形状如图1所示,其中孔与周边V形槽底径有同心度要求。图2所示是成形滚轮的模具结构图。注射成形后的开模动作如下。随着动模下移首先打开A—A分型面,由于型腔板5在模块4的作用下尚未打开,因而塑件仍滞留在型腔内,並由拉料穴的作用拉出浇口料。随着动模继续移动,上型芯1全部抽出塑件,模块4与型腔板5脱离,致使型腔板5可自由向外移动。同时,由注射机顶棒顶动推板使开模器3(图3)的60°头部挤入型腔板5的两拼块中间,帮助弹簧b挤开B—B分型面。由于下 Polycarbonate roller shape shown in Figure 1, in which the hole and the bottom V-shaped groove bottom diameter concentricity requirements. Figure 2 shows the mold roller structure diagram. The mold opening operation after injection molding is as follows. As the movable mold moves down, the A-A parting surface is opened first. Since the cavity plate 5 has not been opened yet under the action of the module 4, the plastic part still remains in the cavity and pulled out of the gate material. As the movable mold continues to move, the upper core 1 completely draws out the plastic part, and the module 4 is separated from the cavity plate 5, so that the cavity plate 5 can be freely moved outwards. Simultaneously, a 60 ° head of the mold opener 3 (FIG. 3) is squeezed into the middle of two blocks of the cavity plate 5 by the ejector ejector lifting plate to help the spring b squeeze the B-B parting surface. Because of the next