1引言夹具是工件加工过程中，对工件进行夹紧的装置。夹具应满足以下使用要求：（1）在夹紧过程中应能保持工件的既定位置，更好地使工件得到定位。（2）夹紧应可靠和适当。既要使工件在加工过程中不产生移动和振动，同时又不使工件产生不允许的变形和表面损伤。（3）操作安全 1 Introduction Fixture is the workpiece processing, the workpiece clamping device. Fixtures should meet the following requirements: (1) During the clamping process should be able to maintain the established position of the workpiece to better position the workpiece. (2) Clamping should be reliable and appropriate. It is necessary to make the workpiece does not move during the processing and vibration, while not allowing the workpiece to produce impermissible deformation and surface damage. (3) safe operation