Rolling pressure collecting method for rolling mill zero setting

Abstract

The zero-adjustment and rolling pressure collection method of a rolling mill of the invention relates to a method for zero-adjustment of a roll gap of a rolling mill. The technical problem to be solved by the present invention is to provide a method that can eliminate roll errors and accurately collect roll gap zeroing parameters. The method includes the following steps: (1) setting the boundary conditions of roll gap zero adjustment, the value of roll line speed s and standard zero adjustment pressure F0; and sending a zero adjustment success signal when the boundary conditions are detected; (2) the detection system In the detection time period t, according to the frequency of the sampling period, n zero-adjustment measured pressure sample values ​​are collected; the detection time period t is determined in the following way: t=N×π×R / s, (3) Calculate n zero-adjustment measured Arithmetic mean of pressure sample values ​​= average zeroing pressure F; (4) Calculate roll gap zero position compensation Δh = (F-F0) / K. The method of the invention eliminates the influence of the processing error and installation error of the support roll on the rolling pressure, and ensures the requirement of the rolling schedule.

Description

technical field [0001] The invention relates to a production process of hot-rolled strip steel in the metallurgical industry, in particular to a method for zero-adjusting the roll gap of a rolling mill. Background technique [0002] The rolling mill, especially the finishing mill, needs to zero-adjust the roll gap before rolling and collect the rolling pressure. For example, the roll gap of the rolling mill is measured under a pre-pressure of 1000T, which is used as the initial value of the roll gap adjustment during the rolling process and carried out. Roll gap zero compensation. Roll gap zero compensation refers to the roll gap zero compensation due to the error between the measured zero-adjusted rolling pressure and the standard zero-adjusted rolling pressure during the process of zero-adjusting the roll gap of the finishing mill. The collection of zero rolling pressure of the finishing mill is to reduce the influence of the eccentric force of the roll on the zero positi...

AI Technical Summary

Problems solved by technology

There are two problems in this general method: (1) Use the basic automatic zero adjustment start signal to activate the measured rolling pressure acquisition. If the eccentric force exceeds the limit, the pressure difference on both sides exceeds the limit, and the zero adjustment line speed exceeds the limit, etc. False data may be collected due to unsuccessful zeroing

(2) The acquisition period adopts a fixed time length (such as 1.5s), which is not an integral multiple of the roll rotation time. Due to the objective existence of roll eccentricity and other problems, the collected data cannot accurately and completely describe the variation law of rolling pressure. Based on this, the zero position compensation of the roll gap calculated by the average zero rolling pressure is not accurate enough