Synthetic setting technology of roll-bending force of five-frame four-roll cold continuous rolling device

Abstract

The invention relates to a roller bending force comprehensive setting method for a five-stand four-roller cold tandem rolling mill, and belongs to the technical field of strip cold rolling. The method can improve plate shape quality of finished products and prolong the service life of a roller bending cylinder. The method is characterized by comprising the following operation steps: (a) acquiring parameters of equipment of the mill; (b) acquiring key technological parameters; (c) setting a roller bending force initial setting value X0={Swi0 i=1, 2, 3, 4 and 5}, an iteration precision epsilon, an allowable maximum roller bending force allowance difference eta 1, and the minimum roller bending allowance eta 2; (d) calculating roller bending allowance of (No.1 to No.5) stands Swi; (e) judging whether inequations that max(absolute [Swi-Swj ] i=1, 2, 3, 4 and 5; j=1, 2, 3, 4 and 5) is less than or equal to eta 1 and min(Swi i=1, 2, 3, 4 and 5) is more than or equal to eta 2 come into existence at the same time, if so, entering (f), otherwise, entering (c), and setting the initial value until the inequations are met; (f) calculating a front pull transverse distribution value of the No.5 stand sigma 15j; (g) calculating a plate shape control objective function F(x)=(max(sigma15j)-min(sigma15j) / T15; and (h) judging whether Powell conditions come into existence, otherwise, changing the setting value and repeating the steps from (c) to (g) until the Powell conditions come into existence, and obtaining the optimal roller bending comprehensive setting value.

Description

technical field [0001] The invention belongs to the technical field of continuous cold rolling of plates and strips, and in particular relates to a comprehensive setting technology of bending force of a five-stand four-high continuous cold rolling mill. Background technique [0002] figure 1 It is a schematic diagram of the production process and equipment layout of the five-stand four-high tandem cold rolling mill. As shown in the figure, the strip 1 is uncoiled from the uncoiler 2 and then sent to the rolling mill. After being rolled by five stands to reach a specified thickness, it is sent to the coiler 3 for coiling. Each frame includes work rolls 4 and backup rolls 5 . figure 2 As shown, during the rolling process, the 1#-5# racks control the shape of the finished strip through work roll bending. [0003] refer to figure 2 It can be known from the equipment characteristics of the five-stand four-high tandem cold rolling mill that the setting of the bending force a...

AI Technical Summary

Problems solved by technology

In fact, for the cold tandem mill, since the exit shape of the upstream stand is the entry shape of the downstream stand, the finished shape of the unit is actually the result of the comprehensive action of the bending forces of the 1#-5# stands At this time, if the bending forces of the five racks are set independently instead of coordinated with each other, the following three adverse consequences are very likely to occur: (1) The effects of the bending forces of the five racks cancel each other out, weakening The control effect of the bending force on the shape of the plate is confirmed; (2) due to the incoordination of the bending force of the five racks, a new additional local wave shape is brought about after the combined effect, which affects the shape quality of the finished product; (3) the five During the setting process of the bending force of the racks, the bending force of a certain rack is too high or even runs at full load, while the bending force of other racks is relatively small, which not only affects the service life of the bending cylinder but also makes the The bending force is too high and there is no room for adjustment on the frame

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