Evaluation of the level of hardening of aluminum alloy chips intended for subsequent pressure treatment

OBRABOTKAMETALLOV Vol. 23 No. 1 2021 TECHNOLOGY To estimate the numerical values of the strain distribution, a relative coordinate x/  is introduced, where x is the current horizontal coordinate,  is the chip thickness. The graph of the dependence  f ( x/  is shown in Fig. 5. Fig. 4. Field of the of shear strain  in the place of separation of the chips from the cutter, on the right with a color key Fig. 5. Dependence of the of shear strain on the relative coordinate x/  Here it can be seen that in this case, the difference in the degree of chip peening by its thickness is 100(2.69 – 1.97)/1.97 = 36 %. Further calculations showed that as the chip thickness increases, this difference will increase, i.e. the chip becomes an increasingly heterogeneous material. Results and discussion Notably, a qualitatively similar solution to the problem was obtained in a joint study of the United States, the Republic of Korea, and the United Kingdom [17]. The problem was solved by the fi nite element method in the Abaqus/Explicit software package for calculating a plane strain state. The task of separating the chips from the workpiece was not always solved successfully by researchers since it required allowance for the beginning of metal destruction, while the continuity hypothesis adopted for constructing a system of equations of the plasticity theory hindered it. However, this is overcome in the article [18], where a signi fi cant hardening of the chip metal is shown. A large degree of deformation localized in the chips leads to physical phenomena, which include the structure re fi nement; paper [19] argues that the grain size decreases from about 60 μ m to 1...3 μ m, i.e. by