METHOD FOR CONTROLLING START-UP OF TANDEM MILL,申请号JP19830112350-传众专利搜索

METHOD FOR CONTROLLING START-UP OF TANDEM MILL

申请公布号：JPS603910(A)

申请号：JP19830112350

申请日期：1983.06.22

申请公布日期：1985.01.10

申请人：

SHIN NIPPON SEITETSU KK

发明人：SAKIMOTO TSUTOMU;NAWATA YASUTAKA;MOTOKAWA HIDEHIKO

分类号：B21B37/48;B21B37/00;B21B37/36;B21B37/46;B21B37/52;(IPC1-7):B21B37/00

主分类号：B21B37/48

摘要：<p>PURPOSE:To restrain an abnormal sheet tension generating at the time of restarting a rolling and to prevent the breakage of a rolling material by adding a circuit having a start-up controlling function to the speed control system of a mill motor of each stand and making the start-up timings of rolls uniform. CONSTITUTION:At the time of starting a mill motor of each stand of a tandem mill after feeding a rolling material between stands, a drooping rate of each mill motor is made to be zero. Next, the rolls of respective stands are driven all at once by providing a pulsative starting torque capable of overcoming the large static friction of a bearing of backup roll to each motor. During the time of acceleration till a normal sheet running speed is attained after starting the rolls, a drooping rate larger than the ordinary one is provided to each motor to attain a prescribed sheet running speed. And a sheet tension caused by the change of a speed ratio between respective stands is balanced. In this way, the breakage of rolling material is prevented.</p>