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In order to accurately predict the variation of cutting forces in the helical milling of CFRP, the effects of anisotropy of CFRP materials and fiber direction angle are emphatically considered in the modeling of cutting forces. The orthogonal cutting analysis of CFRP mesoscopic units is carried out according to different damage areas. On this basis, combining the machining principle of the helical milling and considering the cutting force generated by the periphery edges and bottom edges respectively, the change of cutting forces under different fiber direction angles is analyzed, and the theoretical model of cutting forces for helical milling is established. Through the helical milling experiment of CFRP, based on the measured periodic fluctuation values of the three-way cutting forces, the theoretical values of the cutting forces under the specific revolution angles are solved. The results show that the fitting error between the theoretical and experimental values of cutting forces is less than 16%, which verifies the correctness of the theoretical model of cutting forces in the helical milling of CFRP. [ABSTRACT FROM AUTHOR]

According to the cutting mechanism of helical milling technology， considering the machining characteristics of titanium alloy and geometric features of ball milling cutters， the shape and relative positional relationship between the tool and the workpiece at different characteristic moments were discussed， and four typical moments were selected to study the hole wall formation mechanism. The section characteristics and cross section area of the removed undeformed cutting materials were discussed， and the material removal behavior was analyzed through typical moments in the ball helical milling process. The experiments in ball helical milling of titanium alloy were carried out， the cutting forces were measured， and the tool wear and hole making quality were studied. The results showed that the materials removal process in ball helical milling is uniform and stable basically consistent with the simulation process， and the cutting forces increase or decrease gradually with slight tool wear and high hole-making quality. [ABSTRACT FROM AUTHOR]

The special tool orbits around the axis of the hole while rotating with its own axis and feeds in the axial direction in the helical milling process. Based on the cutting mechanism of the helical milling process， considering the effect of the side edges and bottom edges on the major cutting during the feed process and the anisotropic characteristics of the composite material， a cutting force analytical model was established in the helical milling of carbon fiber reinforced plastics (CFRP). According to the composite material helical milling test data under the full factor condition， the data fitting method was used to identify the bottom edge cutting force coefficient， and the instantaneous cutting force method was used to identify the side edge cutting force coefficient. The results showed that the simulated cutting force can better fit the experimental value. [ABSTRACT FROM AUTHOR]