Optimization of Machining Factors Affects Chip Shrinkage Coefficient, Surface Roughness When High-Speed Milling of Aluminum Alloy A7075

This study uses the Taguchi method to estimate the influence of cutting factors: cutting speed, depth of cut and feed rate (V, t, S) on chip shrinkage coefficient (K) and surface roughness (Ra) when high-speed milling (HSM) of A7075 aluminum alloy. The results show that the t greatly influences the Ra is 51.16%, the second level of influence on the feed rate is 29.77%, then the cutting speed is 19.06%. With the chip shrinkage coefficient, the t, S, and V affecting K are 64.9%, 21.8%, and 13.4%, respectively. Research using Gray multi-objective optimization to invent the applicable set of cutting factors for K and Ra with the corresponding minimum criteria as follows: V = 1695 (m/min), t = 1.0 (mm), and S = 600 (mm/min) respectively.