The Influence of the Geometry of the Innovative Spiral Drill Design on the Cutting Process and Tool Durability

Tool manufacturing is a crucial component of industrial and innovative development in the metalworking industry, where the drilling process plays a key role. Traditional twist drills with conventional cutting-edge designs, including a transverse edge, face several issues during drilling, such as poor chip evacuation and high friction between the tool and the workpiece. These phenomena, in turn, lead to a deterioration in the quality of machined holes and shortened tool life. Existing methods of drill geometry modification only partially address these problems by reducing axial forces and increasing tool durability, but they do not overall improve the drilling process. This study aims to develop and examine a new drill design, a double-point twist drill without a transverse edge. This design facilitates favorable cutting conditions, reduces tool wear, and increases tool durability. Experimental samples of the double-point drill were manufactured at the machine-building company LLP "Format Mach Company" (Pavlodar). The experimental results showed that the double-point drill without a transverse edge significantly improves the drilling process by reducing axial and radial cutting forces, which helps reduce tool wear and increase drill life, confirming the feasibility of this drill design in enhancing the quality of hole machining and the efficiency of production processes in the metalworking industry. The new double-point twist drill without a transverse edge exhibited a 2.2-fold increase in tool life.