The inclination angle of the spiral groove relative to the axis of the drill bit is equivalent to the rake angle of the turning tool. The front angle of the drill bit varies with the position of the cutting edge, with the outer circumference being the largest and the smaller towards the center. At the transverse edge, a negative rake angle is formed, resulting in crushing and crushing of the workpiece material. The large helix angle increases the front angle of the drill bit, resulting in a decrease in cutting torque and axial force. Cutting is light and fast, and chip removal is easy. However, it reduces the strength and heat dissipation conditions of the drill bit, exacerbating the wear of the drill bit. When processing high hardness materials, from the perspective of protecting the cutting tool and reducing wear, it is advisable to choose a small helix angle, while soft materials should choose a large helix angle.
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