Finite Element Analysis of Deformation for Thin Wall Seal in Centrifugal Compressor
There is residual stress during the thin wall seal processing of centrifugal compressors,which has a significant impact on the deformation of thin wall seal processing and is difficult to accurately measure,resulting in low machining ac-curacy of the workpiece.To improve the machining accuracy of thin wall seals and meet the sealing requirements of high flow and high-strength environments,the load application and deformation of thin wall seals during the machining process were analyzed.Taking the aluminum seal of a centrifugal compressor as an example,the parametric three-dimensional mod-eling of the seal was performed using UG software.Through a combination of theoretical analysis and finite element simula-tion,the deformation of the seal under the combined action of cutting force and clamping force during rough machining was analyzed,and compared with the actual deformation.Assuming and simulating the influence of residual internal stress on sealing deformation,under the condition of consistent with the actual deformation trend,the assumed residual internal stress was calculated using the inverse method.The results show that cutting and clamping have an impact on the deformation of thin wall seals during machining,and there is still residual stress release in thin wall seals after machining,leading to re-bound deformation of the machined surface.The sealing deformation is affected by the comprehensive effects of clamping force,cutting force,residual stress,etc.The reverse inference method can be used to quantify the influence of residual stress,which provides theoretical reference for controlling the deformation of thin-walled sealing machining.
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