Bearing ring external expansion type turning fixture

The utility model discloses an external expansion type turning fixture for a bearing ring. The device comprises a body, a rear pull rod, a positioning ring and a spring chuck, protruding column is arranged at the front end of the body, the top end of the convex column has an outer conical surface structure; the rear pull rod is arranged at the rear end of the body; the positioning ring is arrangedat the front end of the body and fixedly connected with the front end surface; the spring chuck is arranged in the positioning ring and is sleeved on the convex column; the front end of the spring chuck is of a split structure; an inner hole in the front end of the spring chuck is of an inner conical surface structure and is matched with the outer conical surface of the convex column; the rear end part of the spring chuck is fixedly connected with the rear pull rod; due to the fact that the inner conical surface of the inner hole of the embedded spring chuck is matched with the outer conicalsurface of the protruding