我厂生产的抽油泵上的零件——球座(如图1),是与园球装配在一起的。园球与球座要配合得很严密,工作时要不漏油。所以球座口要研磨成园弧形。(见图1的放大图)我厂是这样研磨球座的(如图2);在立式鑽床上装上如图3所示的研磨工 I plant the pump parts - ball seat (Figure 1), is assembled with the ball garden. Park ball and tee to tie very closely, work or not spill. Therefore, the ball seat should be ground into a circular arc. (See Figure 1 of the enlarged map) I plant is grinding the ball seat (Figure 2); vertical drilling machine mounted on the grinder shown in Figure 3