Research On Precision Machining Technology Of Aluminum Alloy Complex Thin-walled Parts

Aluminum Alloy complex thin-walled parts with good mechanical properties, has been widely used in missile weapon equipment system and aerospace products, but it is difficult to control the deformation, high precision and geometric tolerance cannot guarantee the problem in actual production, the pursuit of lightweight structural materials, which can not meet the design the requirements are restricted in practical production. In this paper, the precision machining technology of complex thin wall parts of aluminum alloy was studied by the combination of theory and practice. The contents of this paper are as follows:First, the influence of the residual stress on the deformation of precision machining is studied, and the suitable measuring method is found. The application method of harmonic spectrum of vibration aging eliminate residual stress is established based on the finite element simulation model of vibration aging, the main cutting parameters, feed speed and cutting depth etc. the optimization is given to eliminate internal stress parameters of vibration aging,and is verified by the experimental method for the control of processing provides a theoretical basis for the deformation.Then, analysis of the low stress clamping process of precision machining, establish comprehensive work piece stiffness analysis model of tooling, using finite element simulation analysis and comparison of different clamping stress and deformation, the optimal loading schemes, and the clamping point and determine the sampling distribution the study on the optimization of cutting the allowable value of the precision machining deformation analysis,the optimal combination of parameters, optimize the application of low stress in clamping in precision machining.Finally, the structure of the precision machining performance of the detection and analysis, to verify whether the structure to meet the requirements of the model. Three dimension, internal quality, surface roughness and residual stress testing are used to test the quality and defect of the structure. The modal and vibration test is used to verify the performance of the structure.