Al7075 milling deformation and process parameters of bent thin-walled parts

As a representative of 7 series of high strength, 7075 aluminum alloy is used in aviation and high-end equipment with the advantages of comprehensive mechanics and corrosion resistance, and its Al7075 bending thin-walled parts are prone to deformation, large cutting force, poor roughness and other problems during milling. Aiming at the problem of machining accuracy control of bent thin-walled components, the thin-walled arc structure was selected as a typical sample to carry out process optimization research. Based on the single-factor variable method, the combination experiment of cutting parameters was systematically designed, and the influence of machining parameters (feed, spindle speed, radial depth of cut, and axial depth of cut) on the deformation behavior and surface morphology of thin-walled parts was explored, and the milling strategy was analyzed on this basis. The experimental results show that among the milling parameters, the axial depth of cut a_\mathrmp has the greatest influence on the cutting force, and the spindle speed and radial depth of cut a_\mathrme have a greater impact on the surface morphology, the deformation of thin-walled parts and the average roughness. Based on the above experimental results, it is found in the process optimization study that the milling strategy of medium feed rate, high spindle speed, radial depth of cut of about 40% (multi-layer cutting), and medium and low axial depth of cut is more helpful to reduce thin-wall deformation and obtain a smoother surface topography. The research results have high reference significance for improving the processing quality of Al7075 curved thin-walled parts.