Research Of Influence Quenching Stress Field On Machining Deformation In Aluminum Alloy Thick Plate

High performance aluminum alloy material is the key material which is widely used in aerospace structural components and weapons manufacturing. Heat treatment process such as solid solution and quenching has been taken to improve the comprehensive performance of this alloy. However, large internal residual stress comes into being during the process of quenching, due to the inconsistent contraction of surface and core of plate, which produces deformation during the processing of milling the plate become into thin-walled components, and affects the performance of component. Therefore, studying the residual stress field and machining deformation of quenching aluminum alloy plate is necessary, which has vital significance of controlling the machining deformation of thick plate.The simulation and experiments of quenching and milling process in 7075 aluminum alloy plate were taken in this paper. The stress field and deformation characteristics of the plate-thin-walled structure were analysed. And the research work were done as follows:First, the temperature field, stress field and milling simulation model of 7075 aluminum alloy thick plate were established by using the MSC. Marc finite element analysis software, the stress field distribution of quenched aluminum alloy thick plate and the distribution characteristics of stress and deformation in thin-walled component were acquired.Second, based on the mathematical model of layer removal method and the X-Ray surface stress testing, the result of quenching simulation were verified. Combined with the stress field distribution characteristics of simulation, global stress field function of quenched aluminum alloy plate were established.Third, based on the theory of elastic-plastic mechanics, the mechanical bending model of component was established. The deformation characteristics of the component before and after processing were analysed, and the measures to control machining deformation were put forward.All the research context mentioned above has certain guiding significance to the technology study of controlling the component deformation during machining, and makes foundation to establish the force field mathematical model of the thin-walled components in future.