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偏心卡爪式自动夹紧拨盘具有动作迅速、操作轻便和结构简单的特点。因此得到广泛使用,逐渐代替了普通的拨盘和鸡心夹。它的夹紧作用是通过偏心卡爪对工件产生自锁来实现的。在切削过程中由于卡爪的工作表面与工件总能保持接触,因此在切削力作用下,卡爪愈向切削力矩方向旋转,这种接触就愈紧,夹紧工件就愈可靠。目前这种夹紧拨盘多用于夹持同轴圆柱形工件,而用于夹持偏心圆柱工件则很少见。为了交流经验,达到共同提高之目的,特将我厂这方面的情况介绍如下:
Eccentric jaw automatic clamping dial with quick action, light operation and simple structure. Therefore widely used, and gradually replaced the ordinary dial and chicken heart folder. Its clamping effect is achieved by self-locking the workpiece with an eccentric pawl. As the working surface of the jaws always keeps contact with the workpiece during the cutting process, the more the jaws rotate toward the cutting torque under the action of the cutting force, the closer the contact is and the more reliable the workpiece is to be clamped. At present, this kind of clamp dial is mostly used for clamping a coaxial cylindrical workpiece, and it is very rare for holding an eccentric cylindrical workpiece. In order to exchange experiences and reach the purpose of common improvement, we will introduce the situation of our factory in this respect as follows: