Plate stacking straightening method for centre wave buckling of thin-specification high-strength plate

Abstract

The invention discloses a plate stacking straightening method for centre wave buckling of a thin-specification high-strength plate. A linear plate shaped like a Chinese character 'KOU' is stacked on a to-be-straightened plate to be jointly straightened, tension is accordingly generated at the side portion of the steel plate in the straightening process, the amount of the elastic deformation of a centre thickness layer of the side portion of the steel plate is increased, and effective straightening of the centre wave buckling of the thin-specification high-strength plate is achieved. The straightening method includes the specific steps that the linear plate is manufactured; the linear plate shaped like the Chinese character 'KOU' and the to-be-straightened plate are aligned; primary straightening is carried out, and the amount of the plastic deformation is 80%; and secondary straightening is carried out, and the amount of the plastic deformation is 60%. As the method in which the linear plate shaped like the Chinese character 'KOU' is stacked on the to-be-straightened plate to be jointly straightened is adopted, the tension is generated at the side portion of the steel plate in the straightening process, the amount of the elastic deformation of the centre thickness layer of the side portion of the steel plate is increased, and the effective straightening of the centre wave buckling of the thin-specification high-strength plate is finally achieved.

Description

technical field [0001] The invention belongs to the field of steel rolling, and relates to a method for straightening a stack of thin-gauge high-strength plates with curved waves. Background technique [0002] In order to meet the lightweight design needs of downstream steel users, medium and heavy plate manufacturers have continuously developed steel plates with thinner thickness and higher strength through technological innovation. In order to meet the strength requirements, the hot-rolled sheet needs to be quenched and tempered. Affected by the water crown of the quenching machine, there is a difference in the cooling rate between the edge and the center of the steel sheet. When the structural stress exceeds the yield stress, the steel sheet will deform. The middle wave is one of the more typical types of scoops (such as figure 1 As shown), low temperature tempering has limited improvement on the amount of scoop, and the subsequent cold straightening process is the main ...

AI Technical Summary

Problems solved by technology

Larger bending roll compensation increases the uneven force on the working roll and backup roll bearing of the straightening machine, shortens the service life of the bearing, and even causes the bearing to break, which affects the production rhythm. Therefore, the actual use of the bending roll of the straightening machine The amount of compensation needs to be limited to a certain range, so that thin high-strength plates cannot be effectively straightened by conventional straightening processes

Images