Method for improving control accuracy of hot rolling width

Abstract

The invention discloses a method for improving the control accuracy of hot rolling width, which is a width control method for combined rolling of hot rolling rough rolling vertical roll-horizontal roll in a rough rolling area in a hot rolling device. The method comprises the following steps: establishing the control model relation among the width control quantity, accumulated rolling length and the width of a rolling material by introducing the roll surface roughness into rough rolling width control, then determining the thickness reduction of each pass of each roll housing according to the total thickness reduction of a rolled piece, and then predicting the spread of each pass according to the control model and determining the width of a target outlet of each pass according to a width reduction distribution principle so as to determine the roll gap of a vertical roll of each pass; and realizing the width control on the outlet of each pass by controlling the roll gap of the vertical roll, and finally realizing the control on the target width of the rolled piece in the rough rolling area in the hot rolling device. The method solves the problem of width fluctuation when a rough rolling horizontal working roll is replaced every time in the prior art, reduces the intervention of operators, and can reduce the failure rate of rolling width and production cost.

Description

technical field [0001] The invention relates to a method for improving the precision of hot rolling width control, which belongs to metallurgical process control technology. Background technique [0002] With the advancement of hot-rolled production technology and the increasing quality requirements of users for hot-rolled products, the requirements for the width control accuracy of hot-rolled products are also becoming increasingly stringent. Therefore, how to improve the precision of hot rolling width control and reduce the production of unqualified rolled products is an important issue in hot rolling production control. [0003] A brief description of the hot rolling process is given below. [0004] Hot rolling device: [0005] Conventional hot rolling production line consists of heating furnace, rough rolling, finishing rolling, laminar cooling and coiling equipment. In the rough rolling area, there are roller tables, descaling machines, slab width-fixing presses, rou...

AI Technical Summary

Problems solved by technology

According to the analysis of most of the literature research results, when the roll surface roughness is large, the spread will increase, but in actual production, the spread will decrease. Therefore, most of the above research results are inconsistent with the actual change of spread.

[0043] (2) There are problems in the practicability of the friction coefficient formula

[0045] In order to prevent the rolled strip from deviating from the target value, manual intervention is also carried out in the industry. However, due to the difficulty in grasping the surface state of the roll and the different levels of operators, the effect of manual intervention is often not good.

Furthermore, in the hot rolling production process, multiple pieces of material are produced on the rolling line at the same time, and the frequent switching of different materials makes operators often at a loss

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