Evaluation and multi-criteria optimization of surface roughness, deviation from dimensional accuracy and roundness error in drilling CFRP/Ti6Al4 stacks

In this study, machinability tests were carried out to investigate the effects of control factors (cutting tool geometry, cutting speed, and feed rate) on surface roughness (Ra), deviation from dimensional accuracy (Da_dev), roundness error (Re) in drilling CFRP/Ti6Al4V mixed metallic stack determine optimum levels parameters. The each factor their interactions three quality characteristics analyzed, single-objectively optimized for component material by Taguchi method. has components (CFRP Ti6Al4V) with essentially different properties (mechanical, physical, machinability). Single-objective optimization limited usability as must be performed one through both layers. Therefore, an additional step, determined optimizing multi-objective Additive Ratio Assessment (ARAS) Higher Ra, Da_dev, Re values obtained CFRP compared Ti6Al4V component. should drilled a nano fire coated carbide drill (T3) at medium speed high rate achieve minimum go.