Denso Corporation

Nippondenso Co., Ltd.

Nobuyuki Morikawa

Makoto Ito

Kazuhiro Mitsukawa

Kenji Ogura

Yoshitaka Kuroda

Hidemasa Otsubo

Kengo Takeshita

Masafumi Takahashi

Takeshi Kurosawa

Ryoiti Izumi

Keisuke Nakamura

Flat-plate connecting portions are formed in a band plate by a connecting-portion forming unit. The flat-plate connecting portions are cut off by another connecting-portion forming unit except one flat-plate connecting portion so as to form a corrugated-plate connecting portion. A corrugated-plate portion is formed by a corrugation forming unit, so that the corrugated-plate portion has multiple projections arranged in a width direction of the band plate and each of the projections extends in a plate feeding direction. The corrugated-plate connecting portion corresponding to a predetermined connecting number is cut off so as to form a corrugated fin having a predetermined number of corrugated-plate portions.

Corrugated plate manufacturing apparatus

A press machine able to press-work a strip-shaped material during which it can prevent the strip-shaped material from moving or warping or can prevent the strip-shaped material from partially cracking and a processing method using that press machine. A multi-process press machine provided with a drive source M, a camshaftdriven by the drive source M and having a plurality of independent first cams, andand second cams, and, a plurality of die sets each comprised of a pair of a punchand a dieconnected with the first cam, a material holding memberpressing the strip-shaped material W against the diewhen connecting with and pressing the second cam, and a basesupporting the dies.

Multi-process press machine and press-working method

According to the present invention, in the first process, a pipe end of a long pipe is bent with a radius of curvature which is larger than a minimum radius of curvature to form a large R portion. That is to say, bending with a large radius of curvature (R) is performed to form a large R portion in a region in which cracking or excessive reduction of plate thickness of the bend outer-side portion, or buckling of the bend inner-side portion does not occur. Subsequently, in the second process, the pipe is bent with a small radius of curvature form a small R portion by pressing a pipe-end portion of the pipe from a pipe-end direction while fixedly holding the bend side wall of the pipe. In this way, it is possible to obtain an R-minimum elbow configuration irrespective of magnitude of an amount of elongation of material and further without special equipment or mechanisms, by minor modification of present equipment.

Method for producing a pipe and apparatus for the same

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Toyoake, Japan

Nobuyuki Morikawa