Research On The Technology Of Processing On The Assembly Line For Large Thin-walled Cylindrical Component

Because of its compact structure, low density, high specific strength and other excellent properties, thin-walled component has been widely used in aviation domain, aerospace field and other fields. However, it’s quite easy to deform in the process of machining, moving and assembling due to its weak rigidity, which leads to introducing assembling clearance and assembling stress, resulting in adverse effects on the assembly structure. The research of this paper comes from an aviation enterprise’s problem of assembling clearance exceeding the standard of the large thin-walled cylindrical component. Solution was proposed and a dedicated machining device was developed against its reason in this paper. The research and achievement are of great application value to improving the performance of high-end aviation equipment.Firstly, the existing assembling technique of the thin-walled cylindrical component was researched, realizing the reason causing the assembling clearance. And the effect of different assembling clearance on thin-walled cylindrical component was studied by using finite element analysis software, testifying it’s necessary to reduce the assembling clearance. On this basis, in view of the existing method that clearance measurement, machining, and assembling in different places cannot effectively reduce the assembling clearance, a solution that processing the component on the assembly line was innovatively put forward. And a NC machining device with the function of drilling and milling for the large thin-walled cylindrical component was developed.To achieve positioning the thin-walled cylindrical component accurately, the positioning and clamping methods were studied and the effective scheme was determined. Main functional parameters of the machining device were determined through the analysis of the functions of the device and the accuracy requirements of machining the thin-walled cylindrical component. According to the functional parameters, the schemes of general structure and functional units of the machining device were designed. Optimal design and finite-element analyses of static structure and modal were conducted to the main structure. The analyses results showed that the static and dynamic stiffness of the designed structure scheme of the machining device can satisfy the processing requirements. The results of detecting the device’s geometer precision and position precision indicated that the precision of the machining device is good enough to meet the design requirement. At last, the simulation processing experiment to study cutting parameters on milling surface quality and drilling quality was carried out by the machining device designed in this paper, which can provide reliable cutting parameters of the official product’s processing for the enterprise.The solution that processing the component on the assembly line presented in this paper solved the problems of assembling clearance exceeding the standard of the large thin-walled cylindrical component. Moreover, it provided a successful example for other flexible structures.