Abstract:It was introduced that how milling cutters with different spiral angle influenced its cutting performance in particular milling conditions. DEFORM software was used to simulate milling processes of vertical milling cutters with different spiral angle and cutting force curves were gotten. The cutting performances of the cutters were analyzed according to the change of the cutting force. Then entity milling experiments were made, milling cutters with different spiral angle were used to mill workpieces with different material. In addition to the spiral angle, other parameters such as front angle and back angle were unified. After milling,the influences of the milling cutter with different spiral angle on the workpiece surface roughness were observed and the data were recorded. Through comparing the data,the conclusion is that the helical angle is more big, the cutting force is less smaller, the surface of the workpiece is more smoother.