Cold rolling mill opening setting method

Abstract

A method for setting the opening of a cold rolling mill is applicable to a single-seat cold rolling mill, which includes two tension rolls, a fixed worker roll, and a movable worker roll operating along a pressing distance. The method includes a first static pressing process, a first dynamic rolling process, a first predictive adjustment process, a first measurement process, a first mill rigidity calculation process, a target setting process, a second static pressing process, a second dynamic rolling process, a second thickness estimation process, and a final opening adjustment process. By completing these processes, even when the material of the workpiece is unknown, the opening can be properly set according to the required target thickness by gradually reducing the error value and adjusting the parameters in each pass.

Claims

1. A method for setting the opening of a cold rolling mill, applicable to a single-seat cold rolling mill, the single-seat cold rolling mill comprising two tension rolls located on opposite sides for fixing a workpiece and generating tension on the workpiece, a fixed work roll located between the tension rolls and abutting against the workpiece, and a movable work roll spaced apart from the fixed work roll and operating along an adjustable pressing distance, the method comprising: a first static pressing process, wherein when the movable work roll operates along the pressing distance of an initial pass and reaches a first static pressing position, the workpiece generates a first static pressing force abutting against the movable work roll and the fixed work roll; a first dynamic rolling process, wherein the single-seat cold rolling mill applies a first rotational speed to the movable work roll to start rolling, generating a first dynamic rolling force; and a first predictive adjustment process, wherein a reference ratio having a fixed proportional relationship is calculated by dividing the first static pressing force by the first dynamic rolling force. A first measurement process involves measuring the first thickness of the workpiece at an exit end after the initial rolling pass is completed. A first mill rigidity calculation process involves subtracting the first thickness from the first static pressing position and then dividing by the first dynamic rolling force to calculate a first mill rigidity reference value. A target setting process involves inputting a target thickness of the predicted thickness of the workpiece into the single-seat cold rolling mill. A second static pressing process involves the movable roll being compressed downwards a certain distance to move to a second static pressing position, and a second static pressing force is measured. A second dynamic rolling process involves multiplying the reference ratio measured in the first prediction adjustment process by the second static pressing force to obtain a second dynamic rolling force. A second thickness estimation process is used, which divides the second dynamic rolling force by the first mill rigidity reference value and sums it with the second static pressing position to calculate a second predicted thickness. The target thickness is then subtracted from the second predicted thickness to calculate an error value. A final opening adjustment process is also used, in which, if the error value in the second thickness estimation process is within a preset error range, the active roll continues to operate at the first rotation speed, and the final exit thickness of the workpiece is subtracted from the final target thickness to ensure that the final exit thickness is within the guaranteed error value range.

2. The method for setting the opening degree of the cold rolling mill as described in claim 1, wherein, The final opening adjustment process ensures that the error value is less than or equal to 0.01 mm.

3. The method for setting the opening degree of the cold rolling mill as described in claim 1, wherein, If the error value in the final opening adjustment process is greater than 0.01 mm, then the second static pressing process is repeated until the final opening adjustment process.

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