Currently, bi-metal bandsaw blades commonly used in bandsaws feature an alternating set tooth design, where one set of teeth is inclined to the left , and another set remains unset. Different models of bandsaw blades may vary in their tooth arrangement, but a standard alternating set blade typically follows a sequence of left-set teeth, right-set teeth, and raker teeth.
Since teeth are distributed on both sides of the blade, the actual kerf width is wider than the thickness of the blade itself. During the cutting process, the cutting thickness of each set of teeth is not uniform. Specifically, the left-set and right-set teeth remove more material farther away from the raker teeth, while the raker teeth cut more evenly. Although the tooth inclination angle is small, it can be approximated that the cutting thickness of all three sets of teeth is consistent.
During operation, the bandsaw blade is driven by the wheels in a continuous motion. Each tooth sequentially engages in cutting as the blade rotates. When a tooth is in the cutting zone, it experiences cutting resistance from the workpiece. In the non-cutting zone, the tooth is free from any load. As a result, the bandsaw blade is subjected to pulsating cyclic loading throughout the cutting process.
If the cutting speed and feed rate remain constant, the cutting thickness for each tooth will be stable. However, due to differences in wear patterns among the sets of teeth, their service life may vary. During the cutting process, the blade undergoes continuous rotation driven by the wheels. Each tooth engages in cutting sequentially, experiencing cutting resistance in the cutting zone and no load in the non-cutting zone.
Therefore, the blade is subjected to pulsating cyclic loading. If the cutting speed and feed rate are constant, the cutting thickness for each tooth remains stable. However, the varying wear states of different tooth sets lead to differences in their service life
