Effects of tool geometry on cutting performance in CW511L brass drilling

CW511L lead-free brass is a newly developed alloy that has found widespread application across various industrial sectors. It is particularly preferred as a raw material for watering and pumping components, which typically require machining before use. This study investigates the influence of cutting tool geometry on drilling performance, focusing on critical parameters such as radial rake angles, axial rake angles, tip radius, and helix angle. An L27 Taguchi experimental design was employed using the following levels: radial rake angle (4°, 8°, 12°), axial rake angle (−2°, 0°, 2°), tip radius (10, 20, 30 µm), and helix angle (0°, 5°, 10°). Drilling experiments were performed in accordance with this design to evaluate cutting forces, chip breakability, burr height, and surface quality. The effects of tool geometry were analyzed using three-dimensional surface plots and a correlation matrix to reveal significant relationships between input variables and drilling responses.