| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of manufacturing a tube having a groove on the inside surface, by which a tube having a double groove on the inside surface excellent in heat transfer performance is manufactured because defective shape is not generated, the breakage of the tube is not generated and the stable work of the tube having the double groove on the inside surface is performed. SOLUTION: In the method of manufacturing the tube having the grooved inside surface in which a drawing stage where the tube stock is drawn to the drawing direction by a drawing means, a diameter reducing stage where the diameter of the tube stock is reduced, an auxiliary drawing stage where the drawing of the tube stock by the drawing means is assisted by an auxiliary drawing means and a grooving stage where a groove is formed on the inside surface of the tube stock by a grooving means are performed, and a load measuring stage where load which acts in the drawing direction is measured by a load measuring means and a controlling stage where the load is controlled so as to change periodically by controlling at least either of the drawing means and the auxiliary drawing means are also performed. In the controlling stage, the winding peripheral speed of at least either of the drawing means and the auxiliary drawing means is controlled. In the controlling stage, the pressing force to the tube stock of the auxiliary drawing means is controlled. COPYRIGHT: (C)2011,JPO&INPIT |
