Control method for head warping or head down bending for heavy plate rolling

Abstract

The invention relates to a control method for head warping or head down bending in a heavy plate rolling process. According to the control method for the head warping or the head down-bending for the heavy plate rolling, high pressure descaling water at front and back of a rolling machine is used for controlling temperature drop of the upper surface and the lower surface of a steel plate in a rolling process, so that the head warping or the head down-bending of the steel plate in the rolling process is controlled. The high pressure descaling water are respectively equipped at front of the rolling machine and at back of the rolling machine and are divided into an upper group and a lower group. Opening and closing of the upper group of the high pressure descaling water and the lower group of the high pressure descaling water are controlled independently. If the steel plate is warping in head, the lower group of the high pressure descaling water is opened; if the steel plate is down-being in the head, the upper group of the high pressure descaling water is opened. Due to the fact that temperature of the upper surface and the lower surface of the steel plate are controlled by the descaling water at front and back of the rolling machine, the problem of the head warping or the head down bending of the steel plate in the rolling process is controlled, so that a heavy plate rolling machine is protected, and a smooth progress of production is guaranteed.

Description

technical field [0001] The invention relates to a warp or buckle control method in the thick plate rolling process. Background technique [0002] The thick plate rolling process is a process in which a slab of a certain size is rolled into a steel plate of a certain size. Generally, the number of passes rolled from a slab to a steel plate is more than 10, and some steel plates have a rolling pass of 40. More than one time, such as when rolling thick plates with steel ingots. In the thick plate rolling process, due to the influence of factors such as the slab heating process, descaling during the rolling process, and water leakage of the rolling mill water system, the cooling speed of the upper and lower surfaces of the steel plate is different, and the deformation degree of the upper and lower surfaces of the steel plate is also different. Head warping or buckling often occurs, especially when the thickness of the steel plate is above 80mm and the length of the steel pl...

AI Technical Summary

Problems solved by technology

[0008] 5. When the warping or buckling of the steel plate reaches a certain value, the rolling of the steel plate cannot be completed

[0009] In the existing steel plate rolling process, the warp or buckle control can only be adjusted by the speed difference between the upper and lower rolls. The problem of different temperature drops on the upper and lower surfaces of the steel plate during the rolling process cannot be solved. Therefore, when there are many rolling passes, except When the number of scales is large, the temperature difference between the upper and lower surfaces gradually increases, and when it reaches a certain level, the steel plate cannot be rolled due to warping or buckling.

Due to the problem of warping or buckling of the steel plate often exists in the process of thick plate rolling, when the warping or buckling is serious, not only the steel plate cannot be rolled, but also it will cause damage to the equipment

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