OPTIMIZATION OF DRILLING PARAMETERS FOR DIMENSIONAL ACCURACY IN DRILLING OF COMPACT LAMINATE COMPOSITE USING GRAY RELATIONAL ANALYSIS

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The hole drilling process is critical for the assembly of parts manufactured from compact laminate composite. Unsuitable selected drilling parameters affect the dimensional accuracy of the holes. In this experimental study, through holes were drilled with three different cutting speed (VC:178, 250 and 350 m/min), three different feed rate (f:0.07, 0.111 and 0.156 mm/rev) and two different drilling type (Dt: Linear drilling and peck drilling) in dry drilling process of a compact laminate composite plate using high speed steel drill bits with a diameter of 12 mm. The Taguchi L18 orthogonal array was used to perform drilling of compact laminate composite plates. Multiple performance optimization of the process parameters was performed using Gray Relational Analysis and predictive equations were developed via regression analysis. Two process performance parameters namely dimensional accuracy of hole diameter drilled with new drill bit (Da1) and dimensional accuracy of hole diameter drilled worn drill bit (Da2) were optimized. The results of this research revealed that the cutting speed and the feed rate have the most significant effect on the dimensional accuracy of the hole. Optimal levels of drilling parameters are defined as; Vc:178 m/min, f:0.156 mm/rev and Dt:Peck drilling, in the drilling of compact laminate composites.

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Compact laminate composite , Dimensional accuracy , HSS drill , Taguchi method , Gray relational analysis.

Sdu International Technologic Science

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Sdu International Technologic Science