The tension mandrel is an inner hole positioning and tightening fixture used by lathes when processing components on lathes. It has a clamping body. One end of the clamping body is a clamping part and the other end is a deformation expanding part. Tight end; the outside of the deformed tightening end is the positioning point and the tension clamping point, and there is a stress groove between the positioning point and the tension clamping point; the inside of the deformation tightening end is screwed with a tightening screw, and the tightening screw The nail cap part is in the shape of a frustum.
The second type of tension mandrel consists of three parts: the tension clamp body, two tension pistons and a tapered tension screw. The patented technology of this utility model solves the problem that lathes had difficulty in ensuring the shape and position accuracy when machining components with higher shape and position requirements for the inner hole of ordinary tensioning mandrels in the past. Components that require inner hole positioning of different specifications require the expansion required. The force mandrel can be designed and manufactured according to this new tension mandrel.