Study of delamination in the process helical milling of carbon fiber-reinforced polymer composite

Carbon fiber-reinforced polymer composites (CFRP) due to the ratio high strength to weight down day by day growing in various industries, such as aerospace and automotive. Due to the different thermal expansion coefficient between the fibers and resin polymer composite drilling materials difficult to create one of the final parts. The helical milling method in the recent years due to the force reduction in machining and holes at once (no need to pre drill) is one of the new methods for drilling CFRP. In this study, amount delaminate to be explored according to force and machining parameters. For determine the amount of the feed, cutting speed and screw pitch the several tests was conducted and Therefore three cutting speed, four speeds feed and one screw pitch was determined. After the experimental results showed that amount delaminate has a direct relationship with the axial force during machining operations. Also diameter hole is produced factors influencing on the delamination factor (Fd). That increasing cutting speed and reduce feed production of the hole causes with to higher precision and reduced delamination factor.