The usage of the composite materials, which is light and strong, has been rising thanks to the technological developments in the aerospace industries. The most important operation in the assembly process of the parts in producing the aircraft components is drilling which constitutes 50% of the total operation time. The reduction in the workmanship costs of the drilling operation is very important for the competition. In this study, a new step drill was designed to reduce the drilling operation time for drilling of Ø5.94-mm holes on carbon fiber reinforced plastic (CFRP) parts. The tests were applied by using a 12,000 rpm drill motor manually to simulate the actual process and to inspect the impact of new drill geometry on the hole quality. The result indicates that double step drill geometry with 18° nose angle reduces the drilling operation time by making the Ø5.94-mm hole in two steps instead of three steps. The cylindricity and delamination results of existing and newly designed drill geometry were compared. From results, the established new design geometry could be employed for drilling operations of CFRP materials. The time saving for one hole can be obtained as 30 s by using newly designed double step drill. The operation time can be reduced as 33% with this new drill.

由于航空航天工业的技术发展，轻巧结实的复合材料的使用量一直在上升。在生产飞机零部件时，零件组装过程中最重要的操作是钻孔，占整个操作时间的50％。降低钻井作业的工艺成本对竞争非常重要。在这项研究中，设计了一种新的阶梯钻，以减少在碳纤维增强塑料（CFRP）零件上钻孔Ø5.94毫米孔的钻孔时间。通过手动使用12,000 rpm的钻机进行测试，以模拟实际过程并检查新的钻机几何形状对孔质量的影响。结果表明，具有18°顶角的双步钻几何形状通过分两步而不是三步加工Ø5.94毫米的孔，减少了钻孔时间。比较了现有和新设计的钻头几何形状的圆柱度和分层结果。从结果来看，已建立的新设计几何可用于CFRP材料的钻孔操作。通过使用新设计的双步钻孔机，一个孔的节省时间为30 s。这种新型钻头的操作时间可以减少33％。通过使用新设计的双步钻孔机，一个孔的节省时间为30 s。这种新型钻头的操作时间可以减少33％。通过使用新设计的双步钻孔机，一个孔的节省时间为30 s。这种新型钻头的操作时间可以减少33％。