Kayaba Industry Company, Ltd.

Yanagisawa Seiki Mfg. Co., Ltd

Kayaba Industryco., Ltd.

Naomasa Tsuda

Keisuke Mishima

Kazuhiro Kondo

A closing devicewhich presses a dieagainst a rotating pipe bodysuch that an open end portion of the pipe bodyis plastically closed by the dieincludes a cored barinserted into the pipe bodyto close the open end portion of the pipe bodyon the opposite side of the dieand a reactive force applying mechanismwhich allows the cored barto retreat and applies a reactive force to the retreating cored barwhen the cored barreceives a predetermined load or more during processing of the pipe bodyby the die

Closing device and closing method

The holder memberis rotatably supported at the tip portionof the sliding memberplaced on the guide faceof the guide memberarranged fixedly inside the cylinder C. The holder memberis inclined when the tip portionof the profiling memberis inserted between the holder memberand the sliding member. Then the tapered end of the processing rolleris pushed into the inner peripheral surface of the cylinder where the sliding memberand the profiling membermove together in the axial direction of the cylinder, thereby to form a linear groove on the inner peripheral surface of the cylinder C.

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Tokyo, Japan

Naomasa Tsuda