Analysis of machining strategies for fiber reinforced plastics with regard to process force direction

Comparative analysis of wobble milling, helical milling and conventional drilling of CFRPs

“…The factors were chosen in line with previous studies: thus feed rate (v f ) and cutting width (a) were set based on previous studies. Minimum and maximum levels of the factor space of the experiments were set to vf,min = 150 mm/min, v f,max = 250 mm/min, a min = 0.05 mm and a max = 0.95 mm, based on previous studies [20,50,52] and in line with suggestions by tool producers. Cutting speed was fixed to 160 m/min.…”

“…Schulze et al [50] observed that machining-induced damage can be reduced by advanced, complex machining strategies, which direct cutting forces inwards. Schulze and Beke [52] investigated the impacts of process and workpiece parameterssuch as feed, tool inclination, tool spiral angle and cutting-edge radiuson resultant machining force vectors. They also showed that wobble milling is insensitive to tool wear and they developed a mechanistic model to calculate chip geometry and specific forces in the scope of their study [51].…”

“…12 Impact of drilling strategies and cutting tools on the circularity errors of machined holes laminated layers of the composite. The burr area was expected to be larger in drilling operations than in the case of wobble or helical milling operations [50][51][52], because the axial cutting force (which bends the fibres at the exit of the hole) is higher during drilling.…”

“…Even if previously many researchers investigated the impacts of technological and process parameters on conventional drilling induced damages in CFRPs, the number of scientific studies as far as the helical [7,32,35,[43][44][45][46][47], tilted helical [48,49] and wobble milling [50][51][52] of CFRPs are concerned is limited.…”

Machining analysis of natural fibre reinforced composites using fuzzy logic

“…Rentsch et al [6] performed finite element modeling on cutting of carbon fibre reinforced plastics with a disc milling cutter and reported that the calculated and experimental results of the material removal mechanism were almost the same but the cutting forces in comparison with experimental data were not satisfactory. Schule et al [7], in their experiments involving spiral and wobble milling on short glass fibre reinforced composites with polyester resin, illustrated that the direction of the processing forces is directed to the center of the work piece in both methods and wobble milling is not sensitive to tool wear with respect to the process force direction. Prakash et al [8] conducted a series of drilling experiments on medium density fibre boards and reported that delamination factor is influenced by both speed and feed, and the speed-feed combination is also influential.…”