Method for controlling head and tail shapes of hot-rolled strip steel

Abstract

The invention provides a method for controlling the head and tail shapes of hot-rolled strip steel. For the control on the head shape of strip steel, the smooth switching between the balancing and roll bending of a rack is controlled through a steel biting rising edge signal of the rack; and for the control on the tail shape of the strip steel, the smooth switching between the roll bending and balancing of a follow-up rack is controlled through a steel throwing falling edge signal of an upstream rack. According to the invention, through the reasonable design on a hydraulic balancing and roll bending control scheme of a working roll of a rear finishing mill, phenomena such as the head and tail shapes of strip steel are deteriorated due to the instantaneous switching between balancing and roll bending, and the like can be effectively prevented, thereby improving the quality of head and tail shapes of the strip steel, avoiding the occurrence of creasing and strip breakage accidents, and reducing the production cost.

Description

technical field [0001] The invention belongs to the field of steel rolling, and in particular relates to a method for stably controlling the head and tail shape of a steel strip in a hot continuous rolling finishing mill. Background technique [0002] The roll bending cylinder and balance cylinder of the hot continuous rolling finishing mill work roll are the same hydraulic cylinder. Since the hydraulic cylinder is located between the upper and lower work rolls and is stressed by the work roll chock, the hydraulic work roll bending system of the rolling mill simultaneously It has the functions of bending and balancing. When the rolling mill is unloaded, the hydraulic roll bending system is in a state of balance force. Its main function is to support the weight of the upper roll system, realize the setting of the roll gap, and ensure the contact between the upper working roll and the backup roll when the rolling mill is unloaded; The main function is to change the shape of t...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for stably controlling the shape of the strip head and tail plate in the hot continuous rolling and finishing mill, so as to solve the problem of balance and bending in the prior art when the difference between the balance force of the work roll and the force of the bending roll is large. The adverse effect caused by the untimely metal flow in the roll gap caused by the instantaneous switch of the rolls, so as to avoid the deterioration of the shape of the strip head and tail plate and the occurrence of broken strips, etc.

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