CONTROLLER FOR ROLLING SEAMLESS TUBE

摘要

PURPOSE:To control the length or wall thickness of a tube with good accuracy to a specified value by measuring the weight of a billet from which scale is stripped and controlling the number of rotation of the roll of a mandrel mill and its gap in accordance with the weight of the billet, etc. CONSTITUTION:The billet taken out of a heating furnace 1 is pierced by a piercer 2 and the scale which is stuck at that time is stripped off. Then, the billets are rearranged on an alignment line and at this time a weighing machine 11 measures the weight of the billet from which scale is stripped. The result measured by the weighing machine 11 is inputted to an arithmetic and control unit 7. A length meter and outer diameter gage measure the length and outer diameter of the tube shaped by a sizer 6 respectively and they are inputted into the arithmetic and control unit 7. The arithmetic and control unit 7 operates the number of rotation of the roll of the mandrel mill 5 and its nip between the rolls in accordance with the inputted information and deliver them to a sequencer 8 for controlling the equipment. The sequencer 8 controls the mandrel mill 5 in accordance with the input information. The billet is rolled by the mill 5 in a tubular shape and then shaped by the sizer 6.