Abstract
The residual stress of large aluminum alloy ring after heat treatment will cause serious deformation in subsequent processing. The conventional methods for reduction of residual stress (such as stepwise cold pressing and bulging) have little effect in the residual stress reduction for large-scale ring component and will induce inhomogeneous stress distribution. In this paper, roll bending process is adopted to reduce the quenched residual stress of 2219 aluminum alloy super-large ring. The numerical model of roll bending process was established, and the evolution and distribution of stress and strain after roll bending were studied. The influence of roll winding number on the uniformity of stress and strain was analyzed. The results show that the arch-shaped quenched residual stress of the ring changes to N-shaped distribution from inside to outside after roll bending process. The value of the residual stress reduces from ± 180 MPa in quenched state to the value within ± 50 MPa in roll bended state. With the increase of roll winding number, the stress uniformity is improved, but the stress reduction amplitude is basically the same. By analyzing the elastic–plastic strain distribution characteristics and strain springback law of the ring after roll bending, the formation mechanism of N-shaped residual stress distribution after roll bending is revealed.
Highlights
2219 aluminum alloy is widely used in rocket fuel tank, supersonic aircraft skin and other fields due to its excellent comprehensive performance[1,2,3,4]
The value of the residual stress reduces from ±180MPa in quenched state to the value within ±50MPa in roll bended state
The residual stress of 2219 aluminum alloy ring after quenching was reduced by roll bending process
Summary
2219 aluminum alloy is widely used in rocket fuel tank, supersonic aircraft skin and other fields due to its excellent comprehensive performance[1,2,3,4]. It is of great significance to control the quenching residual stress of aluminum alloy effectively. Wu studied the effect of thermal stress relief treatment on reducing residual stress and homogenization of rolling process[10]. Ma used indentation strain gauge method to study the residual stress of 2219 aluminum alloy super large rolled ring[13]. Radial bulging method[16] and roll bending method[17] used in controlling the residual stress of large-size ring parts are reported. The roll bending process of large size 2219 aluminum alloy ring was analyzed by using finite element method, and the evolution of stress and strain was obtained. It is of great significance to understand the evolution of stress-strain field in the bending process of large-scale ring for effectively formulating the stress reduction process. Adjust the position of the ring and the feed roller, and place the quenched ring as shown in the figure, ensure the stability of the installation
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