Mechanism Study And The Effect Of Vibratory Stress Relief On Deformation Of Thin-walled Components Of Aluminum Alloy

The residual stress was introduced by preparing, milling and clamping in the machining process of preparing high-performance aluminum alloy, but those residual stresses will have a negative effect on frame component’s formation.Therefore, it’s essential to study how to eliminate and homogenize the residual stresses.In this subject research, vibratory stress relief technology will be introduced to control the dimension stability of thin-walled frame component of aluminum alloy. The microcosmic mechanism and practical effects of the Vibratory Stress Relief are studied by measuring and comparing the frame component’s formation before and after VSR; observing micro structure of layer with metallo graphic; analyzing elastic deformation theory. The specific works are following:First, the basic mechanism of vibratory stress relief is theoretically analyzed. On the macro aspect, the mechanism mainly is based on analyzing the influence of VSR on stress-strain state of frame component, and the factors that cause residual stress reduction were explained. On the micro aspect, the factors that cause micro local yield of frame component and the relationships among Vibratory Stress Relief, local yield and residual stress reduction are analyzed from the perspective of dislocation..Second,the Vibratory Stress Reliefs experiment is designed to measure frame component’s deformation in different aging time. The experiment keeps three different aging times are 30min,60min and 90min respectively. According to this experiment, the superposition of excitation force and residual stress of frame component is lower than the material yield strength. However, the frame component takes tiny deformation.Third, the thin-walled frame component samples that in different aging time are observed under Optical Microscopy and Transmission Electron Microscopy (TEM), the following facts are found:With increasing aging time, the micro-structure of processing layer area tangled and made a dislocation motion, and both the density and local micro-hardness increased which lead a uneven deformation resistance in material structure; with the effect of stress distribution of overall structure, the deformation resistance in material structure tends to be a new equilibrium stress, which play a positive role to dimensional stability of frame component.