Study On Precision Machining Technology Of Complex Thin - Walled Stent Parts

Due to active development in the area of aerospace and national defense, small complex thin-walled structures are widely used, and higher requirements on the processing quality are also put forward. In the paper, the systematic studies of the processing technology about 2A12 aluminium alloy thin wall bracket parts were carried out on material processing mechanism, cutting parameters selecting and process route planning. The application of such parts processing was technically supported by the results, and its research was valued for more important practical and broader application.Through theoretical analysis of milling and drilling, milling was chosen to holes’ process. The cutting mechanism and typical characteristics of machined surface topography were presented by Scanning Electron Microscopy (SEM). The single-factor and orthogonal tests were employed to carry out on milling 2A12 aluminum alloy. The variation of milling force and surface roughness with a certain cutting parameter, such as cutting speed, feed-per-tooth and depth of cut, was shown in the results of single-factor tests. Additionally, the important factors affecting milling force and surface roughness were shown in the analysis of orthogonal test. Cutting parameters for achieving minimum surface roughness were indicated by the factorial experiment’s analysis. Based on the cutting parameters, predictive models of milling forces and surface roughness were established mathematically by using the partial least-squares regression (PLS), which was verified through experiments.Finally, the above research combining with clamping plan design and tool path optimization have been applied successfully in practical product of three axis integrated complex thin-walled structure. By testing, the machined surface roughness, error of shape, position accuracy and dimensional accuracy was met the design technical requirements. Therefore, the research provides significant reference for finish machining of complex thin-walled structure with such materials.