Rolling pressure setting method for vertical roll rolling in rough rolling area of ​​hot continuous rolling

Abstract

The invention discloses a method for setting rolling pressure of a hot continuous rough rolling area during rolling by the aid of vertical rolls. The method includes steps of firstly, computing an effective deformation degree and an effective deformation rate during rolling by the aid of the vertical rolls according to width rolling reduction of a hot-rolled plate blank on a vertical roll framework in the rough rolling area; secondly, computing deformation resistance of a rolled piece in a deformation area according to the effective deformation degree and the effective deformation rate which are obtained in the first step; thirdly, computing stress state coefficients of the rolled piece in the deformation area according to the width of a plate blank inlet, the width of an outlet and an arc length of a contact area; fourthly, computing the rolling pressure during rolling by the aid of the vertical rolls according to the deformation resistance obtained in the second step and the stress state coefficients obtained in the third step. The method for setting the rolling pressure of the hot continuous rough rolling area during rolling by the aid of the vertical rolls has the advantages that the rolling pressure setting precision of the rough rolling area during rolling by the aid of the vertical rolls can be improved, and accordingly the strip steel width control precision can be enhanced.

Description

technical field [0001] The invention relates to the field of production control of hot continuous rough rolling strip steel, in particular to a rolling pressure setting method for vertical roll rolling in the hot continuous rough rolling area. Background technique [0002] In hot continuous rolling of slabs, the side pressure of the vertical rolls is mainly controlled by the large vertical rolls (VSB) and the small vertical rolls (FE) before the finishing mill, which is the main means of width control at present. The amount of lateral pressure is relatively small, and the effect of lateral pressure cannot penetrate, which will form uneven deformation. After the slab is vertically rolled, because the deformation is not easy to penetrate, the middle part of the slab width hardly bears plastic deformation, and only the metal particles near the contact surface flow, but it is very uneven, and part of the lateral pressure is converted into the extension of the slab. While the re...

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Problems solved by technology

For the side rolling process of vertical rollers, due to the large width of the slab, it cannot be completely rolled through, and only the edges are plastically deformed, and no deformation occurs in the middle. The actual degree of deformation is too small, and the finally calculated deformation resistance is also too small, which leads to inaccurate setting of rolling pressure for vertical roll rolling

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