Tension and conveying speed control method null of thin wall pipe production

摘要

PURPOSE:To manufacture the welded tube of excellent shape characteristic by detecting the tension at the space between the uncoiler and the bending device, and controlling this constantly. CONSTITUTION:The actually measured tension T11 is compared with the target tension T10 with the compating element 13, further the coil diameter from the position detector is taken in. On the result operated with this, the control signal of number of revolution is outputted to the motor 11, and the running speed of metallic strip 60 is adjusted. In such a way, the tension applying to the metallic strip running from the uncoiler 10 to the bending device 20 is made constant. And the tension of the metallic strip in the space between from the bending device 20 to the welder 30 is controlled samely with the computing element 26. Further, the welded tube is carried out with the prescribed transferring speed by setting the target transferring speed corresponding to the welding speed, calculating in comparing the detected transferring speed with the target value, and controlling the running speed of the carrying out device 40 with the compating element 50.