METHOD OF MANUFACTURING COMPONENT MEMBER IN VGS TYPE TURBO CHARGER AND COMPONENT MEMBER MANUFACTURED BY THE METHOD

摘要

A novel method of manufacturing a component member of a VGS turbocharger is provided, which method enables, when manufacture of the component member is performed mainly by press working using a die, the press working to be efficiently performed because of various engineering improvements applied thereto in accordance with working techniques and a formed shape. The invention is characterized in that: to form receiving holes (25) for rotatably holding adjustable blades in a turbine frame as an example of the component member, preparatory holes (25a) having a diameter equal to or smaller than that of the receiving holes (25) in a finished state are formed and then the receiving holes (25) are finished by pressing a steel ball (B) having a diameter approximately equal to that of the receiving holes (25) in the finished state into each of the preparatory holes (25a) to provide a desired accuracy in hole diameter and a desired surface roughness of inner surfaces thereof; and the steel ball (B) is integrally formed on an distal end of a punch portion (PU). <IMAGE>