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 method of manufacturing the turbine frame of a VGS type turbo charger capable of realizing the mass−production of the turbine frame by manufacturing the turbine frame without almost requiring a time−consuming cutting operation when manufacturing the turbine frame rotatably holding a movable blade in the VGS type turbo charger,characterized by comprising the steps of forming a blank material punched out from a metal material with an almost constant plate thickness so as to have a boss part forming part(24a)and a flange forming part(23a)integrally with each other to use as a raw material(W)forming the original member of the turbine frame,forming the boss forming part(24a)in a projected state by a press forging mold and forming,by punching out,a receiving hole for rotatably holding the moving blades in the flange forming part(23a),and performing the machining of the raw material(W)in warm state in a part or all of the processes.