Cutting Structure Design: Hole saws do not break materials as a whole; instead, they perform peripheral cutting using a ring-shaped cutting edge. Therefore, the tooth angle, tooth arrangement, and cutting edge sharpness are crucial. A reasonable tooth design can reduce cutting resistance, making the cutting process smoother, while also reducing burrs and chipping at the hole edge.
Materials and Heat Treatment: The cutting head is typically made of high-speed steel (HSS) or cemented carbide, with hardness and wear resistance improved through quenching, tempering, or coating. Different materials are suited to different machining objects; for example, cemented carbide is more suitable for metal hole sawing, while high-speed steel is more suitable for wood or composite materials. The quality of heat treatment directly affects the tooth life and impact resistance.
Guiding and Coaxial Control: Hole saws are usually equipped with a center guide drill for positioning before cutting, ensuring that the cutting head rotates coaxially with the machined surface, avoiding eccentricity or "hole slippage." Meanwhile, the rigidity and machining accuracy of the connecting rod also affect overall stability; any minute deviation will be amplified into hole diameter error.
Heat Dissipation Control: Since hole drilling involves large-area cutting, it easily generates a large amount of chips and heat. Therefore, the tool groove structure needs to have good chip removal capabilities. A reasonable groove design can quickly remove chips and reduce friction temperature, thereby preventing material scorching or overheating damage to the tool tip.
