Abstract: The finite element simulation and single factor experiment were combined to carry out the research of the influential factors for the milling force of aluminum alloy 6061 in micro-milling. The three-dimensional model of the tool and workpiece was established and assembled， and the mesh was also divided. The micro-milling process of aluminum alloy 6061 material was simulated， and the influence of milling speed and milling depth on the milling force was obtained by the finite element simulation. The single factor experimental study was also conducted. The results showed that: with the increase of spindle speed， the milling force increases first and then decreases， whose turning point is 24000r/min; with the increase of milling depth， the milling force increases first and then decreases and increases， whose turning point is 10μm and 12μm; with the increase of feed rate， the milling force also increases. The optimized parameter combination of aluminum alloy 6061 material in micro-milling is as follows: the spindle speed is 48000r/min， the milling depth is 5μm， and the feed rate is 20μm/s.

Key words: aluminum alloy 6061, micro-milling, milling force, finite element simulation, single factor experiment, optimized parameter