Simulation and experimental study of 7A09 aluminum alloy milling under double liquid quenching

Abstract

To explore the influence of double liquid quenching on the cutting performance of the 7A09 aluminum alloy, quasi-static compression and dynamic impact tests were carried out on the 7A09 aluminum alloy after double liquid quenching using an MTS810.23 universal testing machine and split-Hopkinson pressure bar (SHPB). The experimental data were fitted to obtain the Johnson–Cook constitutive model parameters of the alloy. Simulations of the machining process were carried out using the Deform-3D finite element software. The results showed that the rheological stress increased with the increase in strain rate and the decrease in temperature. The increase in the cutting speed and feed caused the cutting temperature to rise sharply, whereas the influence of the cutting amount on the cutting temperature was weak. Because of the presence of chip nodules, there was extremum in the cutting force vs cutting speed curves. The increase in the feed and cutting depth increased the cutting area Ac, so the cutting force also increased. The simulation results were verified by experiments. The simulation predictions were in good agreement with the test values, and the cutting force and temperature variations with the cutting parameters were the same. Thus, the correctness of the 7A09 aluminum alloy finite element model was verified.

Keywords

7A09 aluminum alloy / double liquid quenching / dynamic impact performance / cutting / finite element method (FEM)

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