AUTOMATIC DIFFERENTIAL PRESSURE SETTER

摘要

PURPOSE:To stabilize the working state in the initial period of starting and to improve the yield of rolled products by adding a specific screw down controller to a rolling mill provided with plural rolls thereby controlling the rolling to adequate screw down in the initial period of the rolling. CONSTITUTION:In the stage of rolling costly steel materials such as stainless steel and special steel with a rolling mill 1a of Sendzimir or the like, a material 2 to be rolled is rolled under controlling with a screw down controller 1b. The diferential pressure DELTAP generated with the mill 1a is detected with a pressure measuring device 11, and is inputted to a controller 9 which calculates the difference from the target differential pressure DELTAP0 given by a setter 92 and outputs the screw down control output DELTASc to the controller 1b depending upon whether said value is positive or negative. On the other hand, in the controller 1b, the screw down command is received and the roll pass of the mill 1a is adjusted and therefore the differential pressure DELTAP of the device 11 changes and a closed loop control system is formed. The material is rolled under the adequate screw down from the initial period of the rolling and the production of defective rolled products is prevented.