Method for controlling the gap width between the work rolls of a cold-rolling stand for the production of strip from metal and a device for carrying out the method

摘要

A method for controlling the gap width between the work rolls of a cold-rolling stand for the production of strip from metal and a device for carrying out the method. Strip sections of predetermined length are scanned continuously at the inlet and outlet and gating times are formed, these being inversely proportional to the strip speed. The gating times are counted by means of counting pulses, the frequency of which is proportional to the strip speed at the outlet. The count values are combined in a manner correct in terms of time in a digital computer with a value measured at the inlet for the thickness deviation of the strip from the desired thickness and, together with input desired values for the strip thickness at the inlet and outlet, a correction value is calculated, this being fed in analogue form to a controller which controls the hydraulic positioning device for the work rolls.