Abstract
In this paper, a complex helicoids’ drill tip of “S” type chisel edge grinded with a three-parallel universal CNC grinding machine tool is carefully studied to obtain the optimum drill bit tip geometry parameters. The effects of experimental parameters, such as apex angle, chisel edge incline angle, and structure circumference rear angle, on the quality of the drilling hole and the machining force were studied from the orthogonal experiment compared with the ordinary drill bit. The range of technological parameters are confirmed which should be used during the drilling process of carbon fiber reinforced plastics (CFRP) in order to realize the reduction of cutting defects such as cutting force and spurs. The effect of spindle speed and feed on the drilling behaviour of the experiment using optimum complex helicoids’ drill tip is also analyzed. It is found that the feed has a great influence on the drilling axial force and the spindle speed has little influence on axial force, but great influence on torque.
Highlights
Carbon fiber reinforced plastics (CFRP) are characterized by lightweight, stiffness-to-weight ratios, high fracture toughness, and good heat resistance [1]. ey have been widely used in airplanes, chemical machinery, communication, transportation, sport equipment, and textweave
Considering that the machinability of CFRP is relatively poor, in this work, a complex helicoids’ drill tip of “S” type chisel edge grinded with a three-parallel universal CNC grinding machine tool is carefully studied to obtain the optimum drill bit tip geometry parameters in order to realize the reduction of cutting defects such as cutting force and spurs in the CFRP plate drilling and realize the high-quality drilling. e effect of spindle speed and feed on the drilling behaviour of the experiment using the optimum complex helicoids’ drill tip is analyzed
In the main cutting edge of the negative rake angle and chisel edge area, the cutting situation is worse, especially in the chisel edge; in this part, the linear velocity is low, the role of which is to roll up and smash the carbon fiber to chip, and the effect of this part of the structure on the CFRP in the drilling process mainly contains two parts of force, one is tangential force Fv2 along the tangent direction and the other is downward vertical axial force Fz2; these force components in the process of drilling accounted for 50%∼60% of total axial force [19], to which both delamination and outlet tearing during drilling CFRP are directly related
Summary
Carbon fiber reinforced plastics (CFRP) are characterized by lightweight, stiffness-to-weight ratios, high fracture toughness, and good heat resistance [1]. ey have been widely used in airplanes, chemical machinery, communication, transportation, sport equipment, and textweave. Chen [4] in 1997, by adopting different apex angles, chisel edge angles, and spiral angles of the drill point, conducted the drilling experiment of carbon fiber composite materials. Lin and Chen [11] explored the drilling process of the carbon fiber reinforced composite material at high speed. Considering that the machinability of CFRP is relatively poor, in this work, a complex helicoids’ drill tip of “S” type chisel edge grinded with a three-parallel universal CNC grinding machine tool is carefully studied to obtain the optimum drill bit tip geometry parameters in order to realize the reduction of cutting defects such as cutting force and spurs in the CFRP plate drilling and realize the high-quality drilling. E effect of spindle speed and feed on the drilling behaviour of the experiment using the optimum complex helicoids’ drill tip is analyzed. It is found that the feed has a great influence on the drilling axial force and the spindle speed has little influence on axial force, but great influence on torque
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