Effect of cutting parameters on machinability of 7075-T651 aluminum alloy in different processing methods
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ORIGINAL ARTICLE
Effect of cutting parameters on machinability of 7075-T651 aluminum alloy in different processing methods Heng Luo 1 & Youqiang Wang 1 & Ping Zhang 2 Received: 9 October 2019 / Accepted: 11 August 2020 # Springer-Verlag London Ltd., part of Springer Nature 2020
Abstract The aim of this study was to explore the influence of cutting parameters on the cutting performance of 7075-T651 aluminum alloy under different processing methods. Using finite element software, normal cutting, x-direction ultrasonic vibration cutting, y-direction ultrasonic vibration cutting, and elliptical ultrasonic vibration cutting processes were simulated with various values of the cutting parameters. The results showed that when the cutting speed was between 160 and 280 m/min, with the increase of the cutting speed, the main cutting force value under the four processing methods increases gradually. At 280–320 m/min, the main cutting force value of normal cutting showed a downward trend. The cutting force increased with the increase of feed and cutting depth. At the same time, the increase of cutting speed and feed increased the cutting temperature and the temperature of the bladeto-chip contact area. However, cutting depth had little influence on the temperature during the cutting process. When the cutting parameters changed, the cutting temperatures of the four machining modes were in the following order: elliptical vibration cutting > y-direction vibration cutting > x-direction vibration cutting > normal cutting. When the cutting speed and feed increased, the magnitude and depth of residual stress increased to a certain extent. As the cutting depth increased, the heat generated by the cutting increased, but most of the heat was carried away by the chips, resulting in lower influence of the thermal stress and phase changes on the residual stress. Keywords Aluminum alloy . Vibration cutting . Processing methods . Cutting force . FEM
1 Introduction Seven series of aluminum alloy can be used as a structural material for aircraft and to manufacture skins and spars. Frames, landing gear, and hydraulic system components are widely used in the aviation field [1–4]. The 7075-T651 alloy is known as the best performing aluminum alloy. “T651” indicates that the alloy has been subjected to heat treatment and pre-stretching, and the alloy also has good mechanical properties and anodizing properties [5–9]. Ultrasonic vibration cutting is a new processing method that combines normal cutting technology and ultrasonic technology. It has the characteristics of small forces, low heat * Youqiang Wang [email protected] 1
School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao, Shandong, China
2
School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, China
generated on the workpiece, good surface quality, improved machining accuracy, and extended tool life [10–17]. Zhou et al. [18] designed a new ultrasonic elliptical vibration cutting device. The frequency
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