Section steel straightening device and method

Abstract

The invention discloses a section steel straightening device, which comprises a straightening roll system, wherein the straightening roll system is arranged on a body; an output end of the straightening roll system is also provided with a rolling and straightening roll system; the rolling and straightening roll system comprises at least one pair of upper and lower rolling and straightening rolls and at least one pair of left and right rolling and straightening rolls; the upper and lower rolling and straightening rolls are symmetrically arranged on the upper and lower sides of a pass steel wire and a roll gap I for passing through section steel is formed between the two rolls; and the left and right rolling and straightening rolls are symmetrically arranged on the left and right sides of the pass steel wire and a roll gap II for passing through the section steel is formed between the two rolls. According to the section steel straightening device and a section steel straightening method, lateral bending of straightened section steel can be effectively improved, and the length of a straightening blind zone of a main bend of the section steel is reduced, so that the section size of the section steel is better, the flatness is higher, the residual stress is smaller, and particularly height difference existing in rail level of the straightening blind zone and a straightening zone can be effectively reduced and the yield of a steel rail is increased when the steel rail is straightened.

Description

technical field [0001] The invention belongs to the technical field of straightening or reshaping of metal rods, pipes, profiles or specific products manufactured therefrom, and in particular relates to a profile straightening device and method. Background technique [0002] After the profile is rolled and formed, it will be bent or twisted due to external force, temperature change and internal force. In order to obtain a qualified finished product, it must be straightened, such as figure 1 Shown is the existing common profile straightening device, which is composed of a straightening machine including upper and lower straightening roller groups arranged horizontally. Defects such as not being straightened in the straightening direction of the side bend, and bending exceeding the national standard requirements after the profile is placed for a period of time. [0003] For rails in section steel, it has high requirements for section shape and straightness, such as figure 2...

AI Technical Summary

Problems solved by technology

[0002] After the profile is rolled and formed, it is bent or twisted due to external force, temperature change and internal force. In order to obtain a qualified finished product, it must be straightened, such as figure 1 Shown is the existing common profile straightening device, which is composed of a straightening machine including upper and lower straightening roller groups arranged horizontally. Defects such as the side bending can not be straightened in the straightening direction, and the bending of the profile exceeds the requirements of the national standard after being placed for a period of time

[0003] For rails in section steel, it has high requirements for section shape and straightness, such as figure 2 Shown is the existing rail straightening device, the device is by adding a straightening machine including the vertical arrangement of the upper and lower straightening roller groups at the output end of a straightening machine including the upper and lower straightening roller groups arranged horizontally, In order to ensure the straightness requirements of the rail straightening process, there are still defects such as straightening blind areas at both ends of the straightened rails, differences in rail height between the straightening blind areas and the straightening area, and excessive residual stress.

[0004] Chinese utility model patent CN201432200Y specification discloses a rail straightening machine. The patent adds cold rolling equipment to the existing rail leveling machine, thereby reducing the rail height of the blind area of ​​rail straightening, and effectively improving the blind area of ​​rail straightening and rail leveling. At the same time, it can correct the full-length fluctuation of the rail height. However, this kind of rail straightening machine has higher requirements for straightening straightness, residual stress and fracture toughness than ordinary rails. For high-speed rails (more than 350 kilometers per hour), there are still defects such as low straightness and excessive residual stress.

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