Control method under dynamic soft reduction and determining method of reduction interval

Abstract

The invention discloses a control method under dynamic soft reduction and a determining method of a solidified tail end and a reduction interval. The control method comprises the steps of: simulating the position of the solidified tail end through a solidifying computing model; carrying out pressure control on a sector of a continuous casting machine, wherein the pressure control comprises same reduction quantity of reducing a plurality of continuous sector near the simulated position, obtaining the pressure value of the continuous sectors; determining the position of the solidified tail end according to the mutation of the pressure value in the continuous sectors, determining the reduction interval according to the position of the solidified tail end; converting pressure control into position control after the reduction interval is determined, determining the reduction quantity of each sector of the reduction interval; and carrying out reduction control on each sector of the determined reduction interval according to the reduction quantity of each sector. The invention corrects the deviation caused by the solidifying computing model, and can effectively avoid the damage caused byreducing the continuous casting machine in a fully-solidified area according to the pressure values required by different types of steel in different positions.

Description

technical field [0001] The invention relates to a slab continuous casting process, in particular to a control method for continuous casting dynamic soft reduction, a method for determining the solidification end of a reduction interval, and a method for determining a reduction interval. Background technique [0002] For the slab formed by the continuous casting process, defects such as center segregation (composition segregation), center porosity, and centerline cracks are easily formed inside the slab. Since center segregation and center porosity cannot be eliminated by subsequent rolling or annealing treatment, and under high stress conditions, center segregation and center porosity are likely to cause delamination of the slab, so solving center segregation and center porosity is the key to improving slab quality an effective way. [0003] The soft reduction technology at the end of solidification is a new technology that is generally concerned by metallurgical researcher...

AI Technical Summary

Problems solved by technology

[0004] At present, the fan section of most casting machines is integrated, and the pressing roller is installed on the upper frame and the lower frame of the fan section. The whole frame is controlled by four hydraulic cylinders to move up and down, and the roller cannot be controlled independently. Press down, so it will not be able to precisely control the roll to press down in the appropriate press down range

Even if the position of the liquid core calculated by the solidification model is very accurate and the control accuracy of the hydraulic cylinder is very high, the reduction interval cannot be well controlled within the range of the set solid phase ratio, and the reduction interval deviates too much from the set solid phase ratio , not only will not play a role in reducing segregation, but may also bring negative effects

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