| 摘要 |
PROBLEM TO BE SOLVED: To provide a preventing method of end crack by heating the peripheries of end parts of a round tubular material and a heating device. SOLUTION: In a cold pilger rolling process, in the preventing method of the end crack by heating an end part of the tube stock before rolling, the end crack of a rolled stock is prevented by heating the end part of the tube stock before the pilger rolling. In a rolling with a cold pilger mill, in the heating device of the end part of the tube stock before rolling, the end part of the tube stock is heated by discharging the tube stock before the pilger rolling from a tube stock table with a kicker, placing it on a free roller after the kicker is lowered in a fixed state to a kicker stopper, advancing it by the dead weight and bringing the end part of the tube stock into close contact with a heating nozzle. COPYRIGHT: (C)2006,JPO&NCIPI
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