Abstract
Drilling processes are a topic of great importance for the manufacturing of carbon fiber reinforced plastics parts. The characteristics of the carbon fiber reinforced plastics contribute to the appearance of a phenomenon called delamination during drilling, which is responsible for the greater part of the rejected parts in various industries. The present work aims to study and characterize the phenomenon of “peel-up” and “push-out” delamination, which occurs in drilling of carbon fiber reinforced plastics laminates at the entrance and exit of the drill, respectively. The work focuses on the study of the influence of the machining parameters: feed rate and spindle speed on the delamination damage. In addition, the influence of the temperature at the entrance of the tool was also studied. For this purpose, three different tools: one conventional and two specific for drilling carbon fiber reinforced plastics laminates were used. The results of the work recognised as the most influential factors the feed rate and the tool, at the entrance and at the exit, respectively. Regarding the tools, the diamond-coated tools were the best to diminish the delamination damage. Finally, for the range of parameters tested, the peel-up delamination decreases as the temperature reached at the beginning of the drilling process increases.
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