Drilling of titanium alloy results in considerable burrs at the exit surface of a hole. The burrs deteriorate quality of hole surfaces and can cause misalignment during assembly. Therefore, burr minimization while drilling is necessary. In this study, innovative chamfered drills with slits have been developed to reduce the burr height and thrust forces. Dry drilling experiments were conducted using chamfered drills without slits and with slits (CWS) having four different point angles. Drilling performance was measured in terms of burr height, thrust forces, and chips morphology. A finite element method-based model was developed to simulate drilling of Ti6Al4V alloy using the drills without and with slits. The results show that the maximum burr height for CWS drills was reduced by 48.5% as compared to the conventional drills. The thrust forces were reduced by 5.5% and were in a fair agreement with the simulation results. For most of the cases, the simulated forces were within 10% of their experimental counterparts.

钛合金钻孔会在孔的出口表面产生大量毛刺。毛刺会降低孔表面的质量，并可能在组装过程中导致未对准。因此，在钻孔时必须尽量减少毛刺。在这项研究中，已开发出具有缝隙的创新型倒角钻，以减少毛刺高度和推力。干式钻探实验是使用不带狭缝且具有四个不同尖角的狭缝（CWS）的斜切钻进行的。根据毛刺高度，推力和切屑形态来测量钻孔性能。建立了基于有限元方法的模型，以模拟使用不带缝隙和带缝隙的钻头对Ti6Al4V合金的钻孔过程。结果表明，与常规钻头相比，CWS钻头的最大毛刺高度降低了48.5％。推力降低了5.5％，与仿真结果完全吻合。在大多数情况下，模拟力在实验值的10％以内。