Forming method for asymmetric pentagonal thin-wall cold-bent steel pipe with sharp corner

Abstract

The invention relates to the technical field of cold roll forming, in particular to a forming method for an asymmetric pentagonal thin-wall cold-bent steel pipe with a sharp corner. According to the method, the center line of a formed pipe serves as a rolling center line, a plurality of passes of rough forming processes are performed on a roller till the two ends of a steel belt machined into an inclined end face are finally closed, and then the steel belt is rolled on the center line; the formed pipe is in an asymmetric pentagon shape defined by a bottom edge, an outer side waist edge, an outer side welding edge, an inner side welding edge and an inner side waist edge; the included angle between the bottom edge and the outer side waist edge is 90 degrees; the included angle between the bottom edge and the inner side waist edge is 90 degrees; the included angle between the outer side waist edge and the outer side welding edge and the included angle between the inner side waist edge andthe inner side welding edge are both obtuse angles and unequal; a sharp corner is formed after the outer side welding edge and the inner side welding edge are welded; and the center line of the formed pipe is a line segment passing through the sharp corner and perpendicular to the bottom edge of the formed pipe. The precise forming of the asymmetric pentagonal thin-wall cold-bent steel pipe withthe sharp corner can be implemented.

Description

technical field [0001] The invention relates to the technical field of cold-bending forming, in particular to a forming method of an asymmetric pentagonal thin-walled cold-bending steel pipe with sharp corners. Background technique [0002] combine figure 1 As shown, the thin-walled cold-formed steel pipe with five sides and sharp corners is applied to the side bracket of the railway freight car, wherein the outer welding side 3 and the inner welding side 4 are respectively welded with the outer box of the railway car to support the car. combine figure 2 As shown, the traditional cold-formed sharp-angle steel pipe is an ordinary square rectangular steel pipe with a sharp corner. Because of its simple shape, it is easy to form, and because its sharp corner surface is a horizontal plane, the extrusion welding quality is easier to control, and the outer weld seam is also Easy planing. Due to the thin-walled and asymmetrical shape of the thin-walled cold-formed steel pipe wi...

AI Technical Summary

Problems solved by technology

Due to the thin-walled and asymmetrical shape of the five-sided thin-walled cold-formed steel pipe with sharp corners, the welding quality is unstable, it is difficult to finish forming, and the defective rate is high

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