A method for online diagnosis of cold rolling work roll condition

Abstract

The invention belongs to the technical field of working roller cold rolling production, and specifically relates to an on-line diagnosing method for the working condition of cold rolling working rollers. The on-line diagnosing method for the working condition of the cold rolling working rollers comprises the following steps that (1) under a roll force mode, an electrical system controls a rolling mill for forced-contact to demarcated roll force, and pressure of ACG hydraulic cylinders at an operation side and a transmission side are equal; (2) the electrical system controls the rolling mill to rotate at a speed of v=240 m / min, after the speed of the rolling mill is stable, the electric system finely adjusts strokes of the ACG hydraulic cylinders at the operation side and the transmission side to enable the difference value between the roll force of the ACG hydraulic cylinders at the operation side and the transmission side to be zero; and (3) the electric system continuously collects the difference values Pdif of the transmission side roll force Pds and the operation side roll force Pos within a time period of 10s; and Pdif = Pds-Pos, if the amplitude A of Pdif is smaller than 20 KN, then it can be judged that the circumferential hardness uniformity of the pair of working rollers meets the requirement for stable rolling, otherwise, it can be judged that the circumferential hardness of the pair of working rollers is non-uniform and cannot meet the requirement for stable rolling. The on-line diagnosing method for the working condition of the cold rolling working rollers has the beneficial effects that the surfaces of the rollers are not damaged, and the extra production time is not occupied.

Description

technical field [0001] The invention belongs to the technical field of cold-rolled production of work rolls, and in particular relates to an online diagnosis method for working conditions of cold-rolled work rolls. Background technique [0002] Work rolls play a vital role in cold rolling production, requiring sufficient strength, toughness and wear resistance to withstand high rolling pressure and impact, so as to improve the ability of work rolls to resist cracking and peeling; work rolls The surface must have high and uniform hardness to ensure the dimensional accuracy and good surface quality of cold-rolled strips and steel plates. [0003] Before the roll is put on the machine, non-destructive testing methods such as turbine flaw detection or ultrasonic flaw detection are generally used to detect the internal defects of the roll. However, since the surface hardness test will damage the surface of the roll, the hardness test cannot be carried out after grinding. [0004...

AI Technical Summary

Problems solved by technology

The uniformity of the circumferential and axial hardness of the roll has a great influence on the rolling production. It has been verified by practice that the circumferential hardness drop of the cold-rolled work roll is greater than 2HSD, which will cause serious strip steel wave-shaped defects during the rolling production process; the cold-rolled work The axial hardness drop of the roll is greater than 2HSD, and a rolling accident may occur during the rolling production process.

Images