Control method of speed and acceleration of continuous hot rolling roughing rolling unit

Abstract

The invention discloses a control method of the speed and the acceleration of a continuous hot rolling roughing rolling unit, belonging to the technical field of continuous hot rolling. The control method is used for automatically controlling the speed and the acceleration of the continuous hot rolling roughing rolling unit through a computer system, comprising the following steps of: realizing or completing the delivery of a computing method, control values and distinguishing marks of the variable speed and the variable acceleration of the continuous hot rolling roughing rolling unit to a first-level computer through a second-level computer; implementing or carrying out continuous hot rolling automatic control on the continuous hot rolling roughing rolling unit according to the control values and the distinguishing marks of the variable speed and the variable acceleration of the continuous hot rolling roughing rolling unit through the first-level computer, wherein the variable speed is computed according to a formula: (1)V=V0(n)p1(1+p2), and the variable acceleration is computed according to a formula: (2)a=a0(1+p). The method has the advantages of developing a new control method of the roughing variable speed and variable acceleration in a control system for solving the problems of slipping, unclean surface descaling, and the like of certain steel grade specifications and solving the problems of the slipping and improving the surface descaling effect by realizing the new control method, thereby enhancing the rolling rhythm and the rolling quality and successfully solving the problems during production.

Description

technical field [0001] The speed and acceleration control method of a hot continuous rough rolling unit disclosed by the invention belongs to the technical field of hot continuous rolling, and specifically relates to a computer system controlled hot continuous rough rolling unit variable speed and variable acceleration control method. Background technique [0002] According to the investigation of other iron and steel enterprises, in the hot rolling rough rolling speed and acceleration control, the method of accelerating to a certain speed with a fixed acceleration is adopted, that is, the speed and acceleration are both a fixed value, and no distinction is made between steel types, specifications, etc. Adjust accordingly. The same scheme was adopted in the original design of TISCO's hot rolling mill, but in actual production, due to the particularity of the variety structure and heating furnace of Taigang's hot rolling mill, the following problems occurred in rough rolling:...

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Problems solved by technology

The same scheme was adopted in the original design of TISCO's hot rolling mill, but in actual production, due to the particularity of the variety structure and heating furnace of Taigang's hot rolling mill, the following problems occurred in rough rolling: First, Slip phenomenon occurs frequently in the transition specification (slip phenomenon refers to that when the strip steel passes through the roughing mill, the strip steel cannot be bitten normally at a certain position, but the roll is still running normally), when the diameter of the work roll becomes thinner (below 1130mm) the The phenomenon is more serious

Second, coarse descaling occurs during the stainless steel rolling process (coarse descaling refers to the descaling before the rough rolling unit, mainly using high-pressure water to remove iron scales on the surface of the strip); third; above 6.0mm In heavy-gauge rolling, rough rolling becomes the bottle diameter of rolling rhythm, which affects the further increase of output

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