Section bar bending and blank manufacturing method for structural steel flash welding thin-wall ring

Abstract

The invention discloses a section bar bending and blank manufacturing method for structural steel flash welding thin-wall ring. The method comprises the steps of dividing a structural steel section bar blanked according to specification into an mn section, an no section, an op section, a pq section and a qw section and heating the structural steel section bar to 780 DEG C + / - 20 DEG C and then feeding the structural steel section bar into a bending machine to be positioned; first bending the op section, and repeating the bending for three times to enable the op circular arc section to have preset curvature radius, wherein the rotary linear speed of an upper roller and two lower rollers of the bending machine is 2400mm / min, and the upward moving speed of the two lower rollers is 10.0mm / min; and then bending the no section and the pq section, and repeating the bending for three times to enable the no section and the pq section to have preset curvature radius, wherein the rotary linear speed of the upper roller and the two lower rollers of the bending machine is 1200mm / min, and the upward moving speed of the two lower rollers is 12.7mm / min. The section bar is bent and deforms into a D-shaped ring blank, two straight sides of the ring blank are connected with the circular arc portion through a transition circular arc section, and a phenomenon that the connection of the two straight sides and the circular arc portion causes break angles and creasing on the surface of the ring blank is eliminated.

Description

technical field [0001] The invention relates to a profile bending method, in particular to a profile bending blank-making method for structural steel flash welding thin-walled rings. Background technique [0002] With the increasing demand for rings in industries such as aviation, aerospace, ships, gas turbines, wind energy, nuclear energy, and bearings, rings formed by traditional rolling methods not only waste a lot of materials due to large machining allowances and low material utilization , but also keeps the cost of ring parts high. The ring parts produced by the flash welding process have less machining allowance, high material utilization rate, and greatly reduce the cost, which is conducive to the development of ring forming technology in the direction of precision forming technology. The preparation technology of flash welding ring blank is one of the key technologies for producing flash welding ring parts. [0003] In the prior art, the following methods are main...

AI Technical Summary

Problems solved by technology

In the flash welding ring blank prepared by the above method, corners will be formed at the junction of the circular arc part of the ring blank and the straight edge parts at both ends, and indentations will easily occur on the surface of the ring blank; the ring blank is formed into a ring by flash welding After bulging, it is necessary to carry out bulging and rounding treatment. During bulging, stress concentration is likely to occur at the corners and the ring will be swollen and cracked, resulting in the scrapping of the ring. When correcting the circle, it takes a lot of man-hours and energy to trim the corners, and it cannot be completely Elimination, the overall ellipticity of the ring after calibration is large; due to the small machining allowance of the flash welded ring, the large ellipticity of the ring and the indentation on the surface will affect the dimensional accuracy of the ring, resulting in low dimensional accuracy. It is beneficial to obtain flash welding ring parts with less and no allowance processing

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