MANUFACTURE OF CYLINDRICAL PARTS

摘要

PROBLEM TO BE SOLVED: To easily and surely remove burrs by roll-forming an inner circumferential side of an opening end part directly to a regular parts shape, and roll- forming an outer circumferential side into an excessive wall thickness part. SOLUTION: A disk-like steel plate having a hollow boss part W1 in a center part is a starting stock, and the steel plate is supported by a mandrel 1 and a tail stock 2, and turned, and then, gradually pressed against the mandrel 1 by a forming roller 3 from a forward end side to a base end side to form the stock into a cylindrical shape. After the tail stock 2 is detached from a work W, the formed work W is drawn out of the mandrel 1. An excessive wall thickness part W3 of a formed end part is cut and removed by a lathe along an outer circumferential surface of the work W. Burrs generated in an outer circumferential edge part of an opening end face W2 of the work W can be removed by the cutting through the chamfering.