Patent ID: 6079242
Filing Date: 2000-06-27
Classification: B21B

Abstract:
A method of controlling a continuous skin-pass and reduction operation for a metal strip, comprising the steps of:passing a strip through a gap between working rollers of at least two successive rolling stands, only an upstream one of said stands, as viewed in a direction of movement of the strip, providing substantial thickness reduction of the strip;determining an extension rate of the strip provided by the upstream stand;determining a tension of the strip downstream of said upstream stand;adjusting the speed of the working rollers of the upstream stand compared to the speed of the working rollers of a downstream one of said stands according to the determination of the extension rate; andadjusting the squeezing force of the upstream stand according to the downstream tension determination,wherein a response time to the step of adjustment of the squeezing force is longer than a response time to the step of adjusting the speed of the working rollers.