A precise control method for side bending of large-scale, large-wall-thickness, and multi-cavity aluminum profiles

Abstract

The invention relates to an accurate control method for a lateral bending problem of a large-specification and large-wall-thickness-difference multi-cavity aluminum profile material. The accurate control method includes the following steps that firstly, an aluminum bar is heated; secondly, an extrusion barrel is heated; thirdly, extrusion is carried out, specifically, the aluminum bar subjected toheat preservation is put into an extrusion machine to be extruded, the temperature of the extrusion barrel is kept at 420-440 DEG C, the temperature of the aluminum bar is kept at 490-510 DEG C, thetemperature of an extrusion mold is kept at 480-500 DEG C, and the extrusion speed is controlled to be 4+ / -0.5 m / min; fourthly, online quenching is carried out, specifically, two rows of spraying nozzles are arranged in the extrusion direction of the aluminum profile material, the length of the two rows of spraying nozzles in the extrusion direction of the aluminum profile material is 3 m, the water sprayed by the spraying nozzles is shaped like a 45 degree cone, the water spraying flow of the nozzles on the side, with larger wall thickness, of the aluminum profile material is controlled to be11.5-12.5 m3 / h, the water spraying flow of the nozzles on the side, with smaller wall thickness, of the aluminum profile material is controlled to be 7.5-8.5 m3 / h, the ratio of the water spraying flow of the thicker side to the water spraying flow of the thinner side is controlled to be 1.3-1.8; and fifthly, straightening is carried out, specifically, the straightening rate is 1-2%. The problem of lateral bending of the profile material can be solved.

Description

technical field [0001] The invention relates to a precise control method for side bending of aluminum profiles, in particular to a precise control method for side bending of large-scale, large-wall-thickness, and multi-cavity aluminum profiles. Background technique [0002] With the accumulation of high-speed train operation data, in order to reduce the car body deformation caused by profile tailor welding, train manufacturers require to reduce the number of welds on large parts such as the car body roof, side walls, and bottom plates. For example, the car body roof is changed from the original 7 The block profile is reduced to 5 pieces for tailor welding. This requirement further increases the complexity of the cross-sectional size and shape of the car body profile. The profile presents a cross-sectional shape that is flatter, wider, thinner, multi-cavity, and has a large wall thickness difference. [0003] For this kind of aluminum profile with large size, large wall thick...

AI Technical Summary

Problems solved by technology

[0003] For this kind of aluminum profile with large size, large wall thickness difference and multi-cavity, large size generally refers to the aluminum profile with a length of more than 20 meters and a width of more than 300mm. For profiles with a size ratio greater than 5, multi-cavity means that there are multiple cavities inside the profile. During the manufacturing process of this aluminum profile, if the temperature of the extrusion barrel, extrusion die and aluminum rod cannot be well controlled, the extrusion process will be difficult. The extrusion process is very easy to produce uneven extrusion deformation, and then the side bending problem; in addition, even if the temperature in the extrusion process can be well controlled, if in the quenching stage, the amount of cooling water, the injection direction of cooling water and the quenching line The length cannot be reasonably distributed, and the side bending problem is still very prominent

[0004] In the preparation process of general aluminum profiles, the length of the quenching line is about 6.5 meters. It is easy to cause deformation at the thin wall position under spraying

[0005] In addition, during the quenching process of existing aluminum profiles, the cooling water is generally evenly sprayed on the surface of the profile, and the spray nozzles are generally distributed up, down, left, and right to achieve uniform spraying, but for this For an aluminum profile with a large size and a large wall thickness difference, uniform spraying will cause uneven cooling of the profile, and the profile will bend to one side

Images