Method for reducing shearing buckling occurrence rate of steel plate with thickness of 23 mm or above

Abstract

The invention discloses a method for reducing the shearing buckling occurrence rate of a steel plate with the thickness of 23 mm or above, and relates to the technical field of steel production. The method comprises the following steps that S1, after being discharged from a furnace, a steel billet is rolled through a roughing mill and a finishing mill, is straightened through a pre-straightening machine, is cooled through ultra-fast cooling, is straightened through a fine straightening machine and then reaches a sectioning shear to be prepared for shearing and sectioning; S2, according to the three-level steel plate size issued by an MES and the position of an on-site scaleplate, a sectioning shear operator inches an advancing or retreating roller way button, and the steel plate is conveyed to the corresponding position; S3, a shearing button is pressed down, and shearing is started; S4, an upper blade falls from the inner side to the outer side to shear the steel plate, when the steel plate is not sheared off after the upper blade falls for 1 second, a post-shearing swing table roller way is started, and after the steel plate is sheared off, a first sub-plate is conveyed to a cooling bed roller way; S5, after the steel plate is shorn off, the upper blade is lifted; and S6, a before-shearing roller way is started, and then a second sub-plate steel plate is conveyed to the cooling bed roller way. The downward bending degree of a shearing opening of the steel plate is effectively reduced, and shearing buckling caused by the fact that the inner side is pressed in the shearing process of the steel plate is reduced.

Description

technical field [0001] The invention relates to the technical field of iron and steel production, in particular to a method for reducing the occurrence rate of shear warping of steel plates with a thickness of more than 23 mm. Background technique [0002] At present, the curvature of the steel plate on the 2800 medium plate line is as high as 6%, and the incidence of shear warp is about 1.82%. The steel plate warp needs to be flattened and cold straightened, which greatly increases the production cost and even affects the contract fulfillment rate. The problem of steel plate bending has become a big mountain in front of the medium plate factory. After the technical research of the medium plate factory, the phenomenon of horizontal pot shape at the head and tail of the steel plate, longitudinal warping of the head and tail, and wave bending have been basically controlled. At this stage, the steel plate of shear curved type has accounted for about 50% of the total amount of ...

AI Technical Summary

Problems solved by technology

[0003] The 2800 medium plate factory has complex varieties and specifications, including 6-60mm low-alloy and some high-strength products. The segmental shearing capacity is weak, and it can only cut steel plates with a thickness of less than 40mm, and steel plates with a thickness of more than 23mm After shearing, the incidence of shear warp is high, which seriously affects the production cost and contract fulfillment rate