The expansion type clamp opens the claw clamp through the co
nical main rod and the flat wedge surface of the claw clamp, and forcefully sticks the clamping hole on the bottom surface of the workpiece, so that the workpiece is firmly held on the clamping surface of the clamp.
Because the clamping force is directly transferred to the position surface of the clamping device, so the workpiece can be strong clamping without skew, so as to suppress the vibration of the workpiece and achieve stable cutting.