Thin-wall disc part finish machining thread lifting repeated positioning clamping method and device

According to the thin-wall disc part finish machining thread lifting repeated positioning clamping method and device, in the clamping device, a base and a cylinder body are each provided with an open circular inner cavity, and the cylinder body is fixedly connected to the bottom wall of the inner cavity of the base; the inner stud is fixedly connected to the bottom wall of the inner cavity of the cylinder body; the lifting cylinder is provided with an internal thread, and the lifting cylinder is screwed on the external thread of the internal stud to realize the lifting motion of the lifting cylinder; the supporting plate is fixedly connected to the top of the lifting cylinder; the pressing plates are arranged above the supporting plate at intervals; a fourth bolt penetrates through through holes in the centers of the pressing plate and the supporting plate and then is connected with a threaded hole in the top end of the inner stud; a sinking table with the diameter of phi C is arranged at the opening part of