JPS55112109A

JPS55112109A - Controlling method for rolling mill

Info

Publication number: JPS55112109A
Application number: JP1903179A
Authority: JP
Inventors: Hiroshi Yamakoshi
Original assignee: Toshiba Corp; Tokyo Shibaura Electric Co Ltd
Current assignee: Toshiba Corp
Priority date: 1979-02-22
Filing date: 1979-02-22
Publication date: 1980-08-29

Abstract

PURPOSE: To prevent generation of flaws due to mutual slip of reducing rolls, by detecting the rapture of the rolled material, and by controlling the rolling mill so as to increase the roll gap and to stop the operation, in the rolling mill whose reducing rolls rotate at different speeds.

CONSTITUTION: In the rolling mill ST possessing the reducing rolls WT, WB, mutually rotating at different speeds for rolling the material S, if the detecting signal CUT due to the rapture of the sheet material S is generated from the inlet side tension controller TC₁ or the outlet side tension controller TC₂, the normally open contact CUT-1a is closed; hereby, the set point P₂ for the opening of the roll gap is given to the rolling reduction controller HPC, and the gap between the rolls WT, WB, is quickly controlled to a point by which two rolls are released from mutual contact; at the same time, by closing the contact CUT-2a, the stop command is given to the controllers SC₁, SC₂, of the reducing roll driving motors M₃, M₄, and the operation is stopped; as a result, the treatment against the rapture of the sheet is made possible without generating flaws in the reducing rolls.