To shorten a producing process without necessitating a post-processing by integrally forming a shaft and a pulley with a forging formation, in the shaft pulley for belt type continuously variable transmission.
Dies 26 for forging is provided with a lower die 56 integrally disposed in the inner part of a body part 28, an upper die 52 displaced in the axial direction under driving action of a driving part 30, an upper pin member 54 for pressing the first shaft part 18 of a ternary forming product 24 as a work from an upper part, and a lower pin member 46 for pressing a second shaft part 20 of the ternary forming product 24 from a lower part. The outer peripheral surface of the first shaft part 18 is subjected to ironing-forming with fourth-fifth projecting parts 80, 82 formed in the through-hole 62b of the upper die 52 and also, the outer peripheral surface of the second shaft part 20 is subjected to ironing-forming with first-third projecting parts 70, 72, 74 formed in the through-hole 62a of a lower die 56, and thus, the dimensional precision of the outer peripheral diameters of the first and the second shaft parts 18, 20 are secured.
NEMOTO KOJI
KIHARA TAKASHI
HATAUE TAKANORI
Toshiyuki Miyadera
Tatsuhiko Sato
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