TY  - JOUR
TT  - THE INFLUENCES OF VARYING FEED RATE ON HOLE QUALITY AND FORCE IN DRILLING CFRP COMPOSITE
AU  - Yaşar, Nafiz
AU  - Günay, Mustafa
PY  - 2017
DA  - September
JF  - Gazi University Journal of Science
PB  - Gazi University
WT  - DergiPark
SN  - 2147-1762
SP  - 39
EP  - 50
VL  - 30
IS  - 3
KW  - CFRP
KW  - Drilling
KW  - Varying feed rate
KW  - Hole quality
KW  - Anova
N2  - The selection of drill geometry anddrilling parameters has high importance due to thermo-mechanical formations indrilling of carbon fiber reinforced polymer (CFRP) which has anisotropicstructure. This study focused on the effects of drilling parameters on thrustforce and hole quality in drilling of CFRP composites by applying constant and varyingfeed rate with uncoated WC drills having different point angles. Surfaceroughness, delamination factor and diameter plays a crucial role in theproduction of close-tolerance holes in hole quality. The quality of the holesurface was examined via surface roughness measurements and surface damage byscanning electron microscopy (SEM). Machinability experiments were performedwith three different levels of drilling parameters that are point angle,cutting speed and feed rate. It was determined that thrust force (Fz),delamination factor (Fd) and surface roughness (Ra) values obtained in drillingprocesses by varying feed rate in hole exit are lower than that of constantfeed rate with average of 21%, 14% and 36%, respectively. On the other hand,hole diameter (d) values obtained with varying feed rate in hole exit were higherthan that of constant feed rate. The effects of drilling parameters on Fz, Fdand Ra were determined by analysis of variance with 95% confidence level andfeed rate was found as the most significant parameter on them.
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UR  - https://dergipark.org.tr/en/pub/gujs/issue//287806
L1  - https://dergipark.org.tr/en/download/article-file/342755
ER  -