Drilling carbon fiber reinforced plastics manufactured by autoclave—experimental and statistical study

Drilling optimization of woven CFRP laminates under different tool wear conditions: a multi-objective design of experiments approach

“…On the other hand, cutting speed has shown some slight influence on the cutting force. Instead, it has been shown that the feed rate is much more influential on both damage generation (delamination) and thrust force during drilling of composites (Shyha et al 2009;Davim and Reis 2003). As another cutting parameter, variation of the point angle of the drill bit has shown different results on the generation of delamination and cutting force.…”

Evaluation of Tools and Cutting Conditions on Carbon Fibre Reinforced Laminates

“…All the holes had a diameter of 6 mm and associated with twist drill, a 1,5 mm pilot hole was made for thrust force reduction. Pilot hole diameter was based on previous works [6,9,12]. Twist drill is a standard drill commonly used.…”

“…Cutting parameters were selected according to author's previous experience, published papers from other authors and fabricant recommendations [6,9,12]. As it has been already demonstrated the major importance of feed rate when compared with spindle speed in thrust forces development [12], cutting speed was always equal to 53 m/min, corresponding to a spindle speed of 2800 rpm and feed rate had three levels -low, medium and high -table 1. After drilling, hole wall roughness was measured with a Hommelwerke profilometer, with a total travelled length of 1,5 mm, a cut-off length of 0,25 mm, an evaluation length of 1,25 mm, a sampling length of 0,25 mm and a travel speed of 0,15 mm/s.…”

“…Several approaches had been presented in the last years [1,4,5,6,7,8,9]. Generally it is accepted that delamination can be reduced with an adequate combination of feed rate, drill material and geometry [4,10,11,12,13,14]. Apart from that, another type can also be identified when drilling laminate composites, the "peel-up" delamination.…”

Evaluation of Thrust force in Drilling Woven roving Glass fibre reinforced Aluminium Sandwich laminates with TiAlN coated drill using Taguchi analysis

“…Basavarajappaa et al discussed the effect of spindle speed, feed rate on feed force developed in drilling hybrid metal matrix composites, the composite is made by stir casting, The effect of these cutting parameters on burr height and surface finish is also studied, the Taguchi analysis is employed to analyse the datas and it is revealed that the output is greatly influenced by the feed rate that the speed [9] Many adverse damages like delamination, fibre pull outs produced during drilling reduce the fatigue strength of composite laminates thereby reducing its durability. [10] Davim et al [11,12,13], Sardinas et al [14] observed that cutting speed has more effect on delamination during conventional drilling of composite laminates. All the structures in metallic materials respond in a same manner under machining loads and conditions, whereas composite laminates having anisotropic structures behave in a different manner at different locations of its structure based on the application of load.…”