| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an apparatus and a method for manufacturing an internally grooved tube, capable of determining occurrence of any tube breakage during the machining before a grooved plug provided on a grooved section is broken by a form rolling ball, and reliably preventing any breakage of the grooved plug. <P>SOLUTION: Each of the apparatuses 10A, 10B, 10C for manufacturing the internally grooved tube comprises a contraction means 13 by which a tube stock 11a is reduction-worked, and contracted, a groove machining means 14 for forming a large number of grooves in an inner surface of the tube stock after passing the contraction means 13, and a reduction working means 16 for reduction-working the internally grooved tube 11 worked on the downstream side in the tube axial direction X of the groove machining means 14. Work-related data detection means 17, 45, 52 which detect the work-related data on the machining load generated in the tube axial direction X as the tube stock 11a is reduction-worked, are provided on the upper-stream side in the tube axial direction X from the reduction working means 16. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
