Study on Batch Deep-hole Drilling Technology of Carbon Fiber Reinforced Plastics

Abstract

Abstract To meet assembly requirements, carbon fiber reinforced plastics (CFRP) generally require mechanical processing, of which the most common form is drilling. As a result of the increasing quantity of use and growing structural complexity of CFRP, the demand for batch high-precision hole making is becoming increasingly urgent. However, existing research is mostly focused on the small-batch and small-thickness drilling of samples. With a customized PCD drill bit, this study investigates the effects of large-batch drilling on the failure forms of the drill bit and the quality of holes drilled. The results show that (1) chip adhesion is of great importance to the failure of the drill bit in the process of batch hole making; (2) fluid cutting facilitates the cooling, lubrication, and chip removal of the bit, thereby dramatically reducing tool wear; (3) dry cutting leads to micro hole expansion so that the holes drilled have a slightly larger diameter than the drill bit; and (4) the addition of support plates at the exit position can effectively avoid defects such as exit tear and delamination.