METHOD OF MANUFACTURING TURBINE FRAME OF VGS TYPE TURBO CHARGER, TURBINE FRAME MANUFACTURED BY THE METHOD, EXHAUST GAS GUIDE ASSEMBLY OF VGS TYPE TURBO CHARGER USING THE TURBINE FRAME, AND VGS TYPE TURBO CHARGER INCORPORATING THE EXHAUST GAS GUIDE ASSEMBLY

摘要

A novel method of manufacturing a turbine frame for rotatably holding adjustable blades in a VGS turbocharger is provided, which method is capable of manufacturing the turbine frame while almost eliminating a time-consuming cutting operation, whereby mass production of the turbine frame and the like can be realized. The invention is characterized in that: a blank which is punched out from a metal material having a substantially constant thickness in such a manner as to integrally include a boss forming portion (24a) and a flange forming portion (23a) is used as a shaped material (W) serving as an original member for the turbine frame; when the shaped material (W) is processed, the boss forming portion (24a) is formed into a projecting state by a press forging tool; receiving holes for rotatably holding the respective adjustable blades are formed in the flange forming portion (23a) by punching; and when the shaped material (W) is processed, some or all of the manufacturing processes are carried out in a warm condition.