Fire bending processing technology of angle steel

Abstract

The invention relates to a fire-bending machining process for angle steel, which includes the following steps: (1) rough surface machining: during the machining process, a machining center is used to shovel back, cut, open half holes and grind planes on the angle steel; (2) local Heating: Local high temperature heating for the section port of the angle steel and the fire bending area of ​​the angle steel, so that it has low deformation resistance and good plasticity at high temperatures, and can protect the metal structure from damage; (3) Opening treatment: the angle steel needs to be Open at the fire curve. After the opening is bent, it needs to be welded and then ground; (4) Correct the hole type and level the fire curve point: For the deformation of the local hole caused by the tensile curve of the steel after the fire bending of the angle steel, it is necessary to The correction is circular. At the same time, the deformation caused by the internal stress and thermal stress after the angle steel is bent during the processing needs to be leveled. At the same time, the pre-opened half hole is opened for the whole hole opening process.

Description

technical field [0001] The invention relates to the technical field of angle steel tower fire-curved angle steel processing, in particular to an angle steel fire-curved processing technology. Background technique [0002] In a 500kV transmission line iron tower project, the scrapping rate at the changing slope was over 50%. After systematic analysis, it was found that the main reasons include two aspects: (1) There were mistakes in stakeout, and the fire curve did not meet the required accuracy; (2) In Huoqu After the treatment, the angle steel will be deformed and extended, which will cause a certain shift in the position of the angle steel. [0003] At this stage, iron tower enterprises have gradually abandoned 2D stakeout software and switched to more ideal 3D entity stakeout software. In this way, the effect of "what you see is what you get" has been achieved on a theoretical level, and it has solved the problem of being affected by The unsatisfactory position of the fi...

AI Technical Summary

Problems solved by technology

[0002] In a 500kV transmission line iron tower project, the scrapping rate at the changing slope was over 50%. After systematic analysis, it was found that the main reasons include two aspects: (1) There were mistakes in stakeout, and the fire curve did not meet the required accuracy; (2) In Huoqu After the treatment, the deformation and extension of the angle steel will occur, which will cause a certain shift in the position of the angle steel's fire curve

[0003] At this stage, iron tower enterprises have gradually abandoned 2D stakeout software and switched to more ideal 3D entity stakeout software. In this way, the effect of "what you see is what you get" has been achieved on a theoretical level, and it has solved the problem of being affected by The unsatisfactory position of the fire curve caused by the influence of lofting errors; for the unsatisfactory accuracy of the fire curve angle steel, the key factor is that the processing technology is relatively backward, because in the traditional process, the hole is often made first, and then the fire curve is easy. It leads to a series of problems such as deformation and extension of the angle steel, and finally causes a large deviation of the actual bending position