VARIABLE BLADE MANUFACTURING METHOD IN VGS TYPE TURBO CHARGER

A novel manufacturing method is provided which can actually achieve mass production of an adjustable blade and a VGS turbocharger having the adjustable blades incorporating therein, wherein a shaft portion is processed to have an aimed at diametrical thickness by rolling in place of cutting so that a cutting operation requiring much time may be eliminated as much as possible from a manufacturing process of the adjustable blade, and wherein a shaft elongation and a sharp edge caused by the rolling can be extremely inhibited to thereby eliminate an additional cutting operation conventionally performed for correcting the shaft elongation and the sharp edge. The present invention is characterized in that a metal shaped material as a starting form for an adjustable blade (1) integrally provided with a blade portion (11) and a shaft portion (12) is formed to have a near net shape having a shape and a size made close to those of the aimed at adjustable blade (1), and in forming the shaft portion (12), a shaft portion forming section of the shaped material is rolled to have a desired diametrical thickness.