Thick standard hot rolling nose plate thermal straightening process

Abstract

The invention discloses a thick standard hot rolling nose plate thermal straightening process, comprising the steps of: firstly, avoiding a steel plate nose part, and then straightening by small rolling reduction in a backward direction, thus avoiding the collision between the head of a nose plate and a straightening roll and reducing the buckling rate of the nose plate; then straightening by large rolling reduction in a forward direction to fully straighten the nose plate. The process adopts a method of firstly avoiding the steel plate and then straightening by small rolling reduction in the backward direction, the problem of collision of the head and the straightening roll in a conventional straightening process of the nose plate is solved, and the buckling rate of the nose plate is greatly reduced; through a method of straightening by large rolling reduction in the forward direction, the nose plate is fully straightened, the cutoff amount of the head of the steel plate is greatly reduced, and yield is improved.

Description

technical field [0001] The invention belongs to the field of steel rolling, and relates to a hot straightening process for hot-rolled warped plates with thick specifications. Background technique [0002] During the rolling process of medium and heavy plates, affected by the deviation of the rolling center line, the diameter and speed difference of the upper and lower rolls, the head of the steel plate will warp or buckle down, resulting in the insertion of the steel plate into the roller table. Although the operator can make manual adjustments, it is difficult to adjust to the ideal state, and can only rely on the subsequent heat straightening process for processing. As an important means of shape recovery after rolling, the hot straightening machine has more advantages than cold straightening. During the hot straightening process, the steel plate still maintains a certain temperature, and the yield strength of the warm steel plate is lower. plastic deformation. In additi...

AI Technical Summary

Problems solved by technology

Because the rolled piece is too long, the temperature drop of the steel plate is large during this process, especially the head temperature drop is more serious, resulting in a decline in its straightening effect. The only way to ensure the qualified plate shape is to increase the head cutting amount, which leads to the rolling of the finished product. In addition, the reduction of the straightening temperature of the whole steel plate will also lead to an increase in the internal stress of the steel plate, which will cause the hidden danger of secondary bending of the steel plate in the later cutting and use process, which will affect the use of users.

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