Inter-regional stress rebalance interactive deformation analysis and precision control method for thin-walled spherical shell components

In the process of material removal layer by layer, the stress release and rebalancing process of thin-walled spherical shell components will introduce large deformation, and the deformation between the processed area and the area to be processed will produce interactive superposition. How to accurately predict the stress and deformation state of thin-walled spherical shell structure is crucial to the final processing accuracy control. However, the existing deformation prediction method of thin-walled spherical shell only considers the deformation during the overall material removal and does not consider the interaction deformation between areas in the material removal process, which makes it difficult to control the processing accuracy. In this paper, the interaction deformation between the processing areas of thin-walled spherical shell components is analyzed, and a multi-datum coordinated compensation method based on the overall deformation is proposed. Firstly, the stress deformation model of the spherical shell based on thin shell theory and energy method is established. The overall deformation mechanism of spherical shell machining is analyzed, and the theoretical basis of subsequent processing area division is given. Secondly, the axisymmetric deformation of spherical shell components is analyzed by the internal force of the spherical shell, and the stress rebalancing mechanism under the interaction between areas during the processing is established. Finally, based on the deformation value of the solved thin-walled spherical shell, the multi-datum coordinated compensation is performed, and the compensation processing experiment is carried out to verify the feasibility and effectiveness of the proposed method. The results show that the method accurately analyzes the overall deformation of thin-walled spherical shell components, reduces the iterative adjustment rounds in the machining process, and effectively improves the machining accuracy and efficiency of thin-walled spherical shell components.