A process parameter optimization method for eliminating residual stress of rings by cold rolling

Abstract

The invention proposes a process parameter optimization method for eliminating the residual stress of a ring by a cold rolling method. According to the initial residual stress distribution state of the workpiece, based on the mechanical and kinematic conditions of ring rolling, combined with the final size and mechanical performance requirements of the ring, and considering the capability of the ring rolling process equipment, the residual stress reduction rate and distribution uniformity are taken as Controlling the optimization objective, taking the reduction rate, driving roll speed, friction coefficient, core roll radius and core roll feed speed as the constraints, a comprehensive optimization setting method for the process parameters of the cold rolling method to eliminate the residual stress of the ring is given , the present invention can systematically and comprehensively evaluate the effect of stress relief, formulate process parameters scientifically, efficiently and accurately, and carry out targeted cold rolling to eliminate residual stress on ring parts, greatly improving the effect of residual stress control, Give full play to the technical advantages of cold rolling method to eliminate residual stress of ring parts.

Description

technical field [0001] This patent relates to the field of residual stress elimination, in particular to a process parameter optimization method for eliminating residual stress of rings by cold rolling. Background technique [0002] High-performance ring parts are key connectors of launch vehicles and key parts of aircraft cabins. Generally, solid-solution-quenching-aging-strengthened alloys are used. The ring parts after rolling must be solution-quenched to improve the toughness, strength, and strength of the material. Anti-fatigue performance and corrosion resistance, etc. However, the ring after solution quenching will produce large quenching residual stress, which will cause serious deformation and even warpage in subsequent machining. After heat treatment, the ring is in an unstable equilibrium state of residual stress. When the external conditions change to a certain extent, this unstable equilibrium state is broken, resulting in the release of part of the residual s...

AI Technical Summary

Problems solved by technology

[0007] However, the process parameters used in the technical application of the existing cold rolling method to eliminate the residual stress of the ring are mainly based on the simulation or the traditional pre-deformation treatment method. The main problems are: (1) the effect on the residual stress of the ring The evaluation is relatively simple and cannot systematically and comprehensively reflect the effect of stress relief

Therefore, there is an urgent need for a systematic and comprehensive evaluation method for the effect of residual stress relief. On this basis, a scientific, efficient, and accurate process formulation method is proposed to solve the problem that the effect of cold rolling method to eliminate residual stress is relatively simple. To solve the problem, the cold rolling method to eliminate the residual stress of the ring is targeted to avoid blindness in the test and improve the test efficiency, so as to quickly and effectively determine the best process plan for the cold rolling method to eliminate the residual stress of the ring. To achieve the purpose of reducing and homogenizing the internal residual stress of the ring and improving the service life of the ring

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