Method for section bar bending blank manufacturing of ball bearing steel flash welding thin-wall annular member

Abstract

The invention discloses a method for section bar bending blank manufacturing of a ball bearing steel flash welding thin-wall annular member. The method includes: dividing the ball bearing steel section bar discharged according to specification into an mn section, an no section, an op section, a pq section and a qw section, heating the five sections to the temperature of 730+ / -20DEG C and then filling the five sections into a bending machine for positioning; firstly bending the op section, wherein the rotating linear speed of an upper roller and two lower rollers of the bending machine is 240mm / min, and the upward moving speed of the two lower rollers is 6.0mm / min; performing bending for three times, and additionally enabling the op arc section to reach the preset radius of curvature; then bending the no section and the pq section, wherein the rotating linear speed of the upper roller and the two lower rollers is 1200mm / min, and the upward moving speed of the two lower rollers is 12.7mm / min; and repeating bending for 5 times, and at this time, enabling the no arc section and the pq arc section to reach the preset radius of curvature. The section bar is bent and deformed into a D-shaped annular blank, two straight edges of the annular blank and the arc part are connected through a transition arc section, and bent angles formed by connection between the two straight edges and arc parts and creasing generated on the surface of the annular blank are avoided.

Description

technical field [0001] The invention relates to a profile bending method, in particular to a profile bending blank-making method for bearing 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 mainly ...

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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