SHAFT HOLDING SLEEVE AND SHAFT ENLARGEMENT PROCESSING MACHINE, AND JIG FOR SHAFT ENLARGEMENT PROCESSING MACHINE

摘要

PROBLEM TO BE SOLVED: To improve workability of shaft enlargement processing.SOLUTION: In shaft enlargement processing for enlarging a part of a shaft material W, a shaft holding sleeve 11, which holds an end of the shaft material W by being inserted into a fitting hole 20 of a pressure device for imposing axial compressive stress on the shaft material W, has at least one air circulation passage 36 that reaches a surface of an exposed part 33 exposed to the outside of the fitting hole 20 from a tip surface on the tip side in the direction of insertion into the fitting hole 20.