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.