Angle iron fire bending machining process

Abstract

The invention relates to an angle iron fire bending machining process. The process includes the following steps of firstly, performing surface rough machining, wherein backing off, scarfing, half holeforming and flat surface grinding are performed on angle iron by means of a machining center in the machining process; secondly, performing local heating, wherein local high-temperature heating is performed on the section port and fire bending area of the angle iron, the resistance to deformation is low and the plasticity is high at a high temperature, and the metal structure can be protected against damage; thirdly, performing opening treatment, wherein opening needs to be performed on a fire bending cushion before fire bending is performed on the angle iron, and scarf welding and grinding are needed after opening bending; fourthly, correcting the hole type and leveling a fire bending point, wherein deformation (in an elliptical shape) happens to part of holes due to the tensile curve ofa steel material after fire bending is performed on the angle iron, so the holes need to be corrected into circular, meanwhile, in the machining process, the deformation caused by the internal stressand heat stress need to be leveled after the angle iron is bent, and meanwhile the preformed half holes are conditioner and formed.

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