SHAFT DIAMETER ENLARGING APPARATUS AND SHAFT DIAMETER ENLARGING METHOD

摘要

A shaft diameter enlarging apparatus and a shaft diameter enlarging method are provided. The shaft diameter enlarging apparatus includes a presser to apply pressure to both ends of a shaft in an axial direction, a load generator to apply alternating load in a direction intersecting the axial direction to an intermediate portion of the shaft, a detector to detect an outer diameter of the intermediate portion being enlarged, along with a compression in the axial direction, through the application of the pressure and the alternating load, and a controller to control the presser and the load generator. The detector includes a contact element arranged to contact an outer peripheral surface of the intermediate portion to detect the outer diameter based on a displacement of the contact element. The controller adjusts the pressure applied by the presser and stops the compression of the intermediate portion, based on the detected outer diameter.