Patent ID: 6055834
Filing Date: 2000-05-02
Classification: B21B

Abstract:
Method to control drawing action of rolled stock in a segment of a rolling line comprising at least a semi-finishing block with multiple reduction passes with one or more motors and a finishing or post-finishing block with one or two reduction passes with its own motors, comprising measuring a section of rolled stock passing through by a first detector located at an outlet of the semi-finishing block; measuring the section of the rolled stock by a second detector located at an inlet to the finishing block; measuring the section of the rolled stock with a third detector located at an outlet of the finishing block; comparing the measurements of the section at the outlet of the semi-finishing block, at the inlet to the finishing block and at the outlet of the finishing block with corresponding expected values stored in tables in a control unit; and correcting any divergences included in an admissible correction range with respect to the expected values by the control unit acting in feedback on the drawing action by controlling at least one of the motors so as to return the value of the section of the rolled stock to around the expected value.