Blanking-making method achieved by bending section bar of alpha-beta two-phase titanium alloy thin-wall ring piece

Abstract

The invention discloses a blanking-making method achieved by bending a section bar of an alpha-beta two-phase titanium alloy thin-wall ring piece. The method includes steps that the alpha-beta two-phase titanium alloy section bar blanked according to specifications is divided into five sections of mn, no, op, pq and qw, then heated to 704 DEG C + / - 20 DEG C and filled into a bending machine for positioning. The op section is firstly bent, rotation linear speeds of an upper roller and two lower rollers of the bending machine are 2400 mm / min, the upward moving speeds of the two lower rollers are 7.5mm / min, the op section is repeatedly bent for four times, and at this time, the op circular arc section reaches a preset curvature radius; and then the no section and the pq section are bent, the rotation linear speeds of the upper roller and the two lower rollers are 1200 mm / min, the upward moving speeds of the two lower rollers are 9.5mm / min, the no section and the pq section are repeatedly bent for four times, and at this time, the no circular arc section and the pq circular arc section reach preset curvature radii. The section bar is bent and deformed to be a D-shaped ring blank, two straight edges and a circular arc portion of the ring blank are connected together through transition circular arc sections, so that the phenomena that folded corners are produced at the position of the connection of the two straight edges and the circular arc portion, and pressing marks are produced on the surface of the ring blank are eliminated.

Description

technical field [0001] The invention relates to a method for bending a profile, in particular to a method for bending a profile for α-β two-phase titanium alloy flash-welded 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 the large machining allowance and low material utilization rate , but also keep the cost of the ring high. The rings produced by the flash welding process have less machining allowance, high material utilization rate, and greatly reduced costs, which is conducive to the development of ring forming toward the direction of precision forming technology. The preparation technology of flash welded ring blanks is one of the key technologies in the production of flash welded ring parts. [0003] In the prior art, the following methods ar...

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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