Control method for lateral irregularity of hot rolling aluminum alloy sheet

Abstract

The invention discloses a control method for lateral irregularity of a hot rolling aluminum alloy sheet. According to the control method for lateral irregularity of the hot rolling aluminum alloy sheet, an emulsion spray device for cooling the lower surface of the sheet is arranged in a conveying roller bed. With such arrangement, the lower surface of the sheet can be cooled by the emulsion spraydevice, it is guaranteed that the upper surface and the lower surface of the sheet are the same in rate of temperature fall, then the cross section of the upper surface and the cross section of the lower surface of the sheet can carry out uniform cooling shrinkage, the technical effect of improving the lateral irregularity of the sheet can be achieved, and the production quality of the hot rollingaluminum alloy sheet is further improved effectively.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy production, in particular to a method for controlling transverse roughness of hot-rolled aluminum alloy plates. Background technique [0002] Usually, in order to improve production efficiency, hot rolling is carried out with a large pass deformation as much as possible under high temperature conditions, and then the internal stress of the plate is eliminated by roll straightening or stretching to improve the unevenness of the plate. degree purpose. Roller straightening can effectively improve the transverse unevenness of the plate, but roller straightening can easily lead to insufficient elimination of aluminum on the surface of the plate during the straightening process and insufficient internal stress relief, and subsequent use is prone to processing deformation; while stretch straightening can be better Eliminate the internal stress of the plate and avoid subsequent processing deformat...

AI Technical Summary

Problems solved by technology

Roller straightening can effectively improve the transverse unevenness of the plate, but roller straightening can easily lead to insufficient elimination of aluminum on the surface of the plate during the straightening process and insufficient internal stress relief, and subsequent use is prone to processing deformation; while stretch straightening can be better Eliminate the internal stress of the plate and avoid subsequent processing deformation, but the roller straightening cannot improve the transverse unevenness of the plate, and cannot meet the needs of products that require high transverse straightness

[0003] In order to prevent aluminum from sticking to the lower surface of the plate in contact with the conveying roller table, the conveying roller table is generally designed as a concave roller table in the hot rolling production line to ensure that the plates of different widths and the roller table are always in point contact on both sides. Under its own weight, the parts that are not in contact with the roller table are sunken, resulting in large transverse unevenness of the plate

At the same time, due to the inconsistent cooling rate of the upper and lower surfaces of the upper and lower plates, the upper surface has a fast cooling rate due to fast air flow, and the lower surface has a slow cooling rate due to slow air flow, resulting in inconsistent cooling shrinkage of the upper and lower surfaces. The degree of depression in the middle part of the plate transverse direction

The subsequent stretching and straightening can improve the longitudinal unevenness of the plate, but cannot improve the transverse unevenness of the plate. As a result, many plates whose transverse unevenness exceeds the standard cannot be delivered to users