Method for induction bending deformation of pressure-resistant tubes with thick wall thickness and large diameter

摘要

In a method for inductively bending deformation of a pressure-resistant tube (1) having a thick wall thickness and a large diameter, in the start phase t1, the start tangent (3) of the tube (1) is an inductor without intervention of a bend clamp (31). It is heat-treated by being inserted through (20). At time t2, at the end of the start tangent (3), the feeding of the tube is stopped and the inductor (20) is moved along the tube (1) in the opposite direction to the feeding direction, while the bending clamp (31 ) Is closed in tube (1). In phase t3, to start the bending process, the moving speed of the inductor (20) is reduced to zero, the inductor (20) is moved to its bending position, and at the same time the feeding of the tube (1) is started. The In phase t4, the pipe bending portion (4) is manufactured with the process feed rate of the pipe (1) being constant. In phase t5, the feed speed of the tube (1) is reduced, the inductor (20) is accelerated in the direction opposite to the feed direction, and the bending clamp (31) is opened. In phase t6, the termination tangent (5) is heated by sending the inductor further in the reverse direction.