Patent ID: 8973304
Filing Date: 2015-03-10
Classification: B23B,B23Q,Y10T

Abstract:
1. A holding jig for a thin cylindrical work, the holding jig comprising: a holding member made of a metal and having a cylindrical shape and an elastically expandable or contractible diameter, the holding member configured with an outside diameter of the holding member being held smaller than an inside diameter of the thin cylindrical work for insertion of the holding member into an inner periphery of the work and being expanded after insertion of the holding member into the inner periphery of the work to hold the work from an inner peripheral side of the work with an outer peripheral surface of the holding member in close contact with an entire inner peripheral surface of the work; and a diameter changing unit configured to apply either an axial external force in a compressing direction or an axial external force in a tensile direction or alternately an axial external force in a tensile direction and an axial external force in a compressing direction to both ends of the holding member to change the diameter of the holding member; and a pair of circular side plates, wherein