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我厂试制了自动加压式端面拨动顶尖(见图),对小直径短的轴类加工效果较好。具有结构简单,定心精度高和工作可靠等优点。它由顶尖1、拨爪体2和拨爪3组成。件1和件2用反螺纹连接,件3是三块高速钢片,镶嵌在件2的端面。使用时,用手逆转拨爪体,使它压紧工件端面。由拨爪带动工件进行车削。车削时,切削力使工件与拨爪进一步压紧,压紧力随切削力的增加而增加,从而保证了可靠的传动。这种顶尖需同尾座活动顶尖配合使用,并应注意
I plant a trial of the automatic pressure-type face toggle top (see Figure), a small diameter of the shaft processing is better. Has the advantages of simple structure, high centering accuracy and reliable work. It consists of the top 1, the claw body 2 and the claw 3. Piece 1 and piece 2 are connected with a reverse thread, piece 3 is three high-speed steel, inlaid in the end face of piece 2. When in use, reverse the claw body by hand to make it compact the end face of the work piece. By the claw driven by the workpiece turning. Turning, the cutting force to make the workpiece and claw further compaction, pressing force increases with the increase of cutting force, thus ensuring a reliable transmission. This top need to be used in conjunction with tail tail activity, and should be noted