To manufacture with good productivity exhaust system parts for an automobile such as a catalyst converter having a connection part and a cone part by applying diameter reduction processing to a pipe end of a metal pipe storing an inner insertion member such as a catalyst carrier without generating wrinkles or cracks at a diameter reduction processing portion.
Diameter reduction processing is carried out by reciprocating a processing roller in an axial direction while moving the processing roller in the radial direction of the metal pipe using the processing roller arranged at the outer circumference of the pipe end of the metal pipe storing the inner insertion member such as the catalyst carrier and relatively revolving around it. The exhaust system parts for automobile such as the catalyst converter are manufactured by forming the cone part and the connection part at both the pipe ends of the metal part. The diameter reduction processing is carried out by the processing roller while a wound body comprising a plate-like material having elasticity such as a spring steel plate is inserted to the inner side of the pipe end of the metal pipe to be processed as a metal core.
COPYRIGHT: (C)2010,JPO&INPIT
Akihiro Ando
Atsushi Kurobe
Yasuhiro Nohata
TOYOTA JIDOSHA KABUSHIKI KAISHA
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