To manufacture a rocker arm made of metal sheet including the sipper face coming into contact with a valve cam by press processing.
The rocker arm has a main wall part 21, side wall parts 22, 23 almost perpendicular to the main wall part 21, and a slipper part 24 almost perpendicular to the side walls. It is manufactured by a plurality of processes while conveying a strip material 28. The manufacturing processes have folding processes F, G for folding a part corresponding to the slipper part 24 of a product part 28a almost perpendicularly to the side wall parts, a side wall bending process I for folding parts corresponding to the side wall parts 22, 23 of the product part 28a almost perpendicularly to the main wall part 21, and restriking processes J to L for curving and forming a part corresponding to the slipper part 24 so as to be thinner than the plate thickness of the strip material 28 separately for a plurality of number times.
SASAKI HIDEFUMI
YANO MASARU
HASHIMOTO TOMIO
TAKEUCHI HIDEO
YAMADA KAZUNORI
ORIHARA MICHIO
IZUMIDA YOSHIMASA
YOSHIDA NOBUAKI
KANEKO KOICHI
AOYAMA KIMII
SEKINO KEISUKE
FURUKAWA RYO
OGAWA YOICHI
YAMADA TOSHIAKI
KOBAYAKAWA SHINICHI
ITABASHI YASUYUKI
IZUMIDA KOGYO KK
Yoshitaka Kozuka