BURR HEIGHT STUDY FOR DRILLING CARBON EPOXY COMPOSITE/TITANIUM/ALUMINUM STACKS

摘要

In this study, a stack of carbon fibre reinforced polymer (CFRP), titanium and aluminium alloys was drilled using a different set of cutting parameters for each layer. This paper focuses on the analysis of the burr heights at the outlet of the titanium and aluminium alloys. The burr heights are observed in terms of the thrust force, the torque, the hole diameter and circularity, and the clearance tool wear. The selected input parameters were the feeds and speeds of each layer of the studied stack, with three feeds and three speeds for each material of the stack selected. The impact of these parameters on the burr heights of aluminium and titanium parts is presented, as well as correlations between the burr heights with the thrust force, the torque and the clearance tool wear. Three twist drills, with a common geometry and coating, were used in this study.