SIZING ROLLING METHOD FOR SEAMLESS STEEL TUBE

摘要

PURPOSE:To reduce the bend fraction defective of a formed part by executing the sizing rolling by using a sizing machine of an elastic type liner, in a seamless steel tube manufacturing line. CONSTITUTION:By a sizing machine 1 for fixing a stand 3 for supporting a roll 2 to a saddle 5 through a liner 4, a stand fixing liner 4 is replaced with an elastic type liner 4 having an elastic member 41. By executing the sizing rolling by the stand 3 to which this elastic type liner 4 is attached, pass misalignment of the stand, and uneven heat, uneven thickness, an ellipse, etc., of a tube stock are absorbed, a bend of the tube stock can be obviated, and its bend fraction defective can be reduced.