| 摘要 |
A band saw blade includes multiple saw teeth having a straight tooth and right and left set teeth, and also includes a gullet portion provided between the saw teeth. A rake surface of each of the saw teeth is provided with a chip curler portion formed into an arc shape at an entire range of approximately 90° to form a chip generated at the time of cutting a work into a small rolled shape before the chip comes into contact with a bottom portion of the gullet portion. A chip non-contact surface to be kept out of contact with the chip is formed to have either a flat surface or a convex surface between the chip curler portion and the bottom portion of the gullet portion, and a dent portion is formed between the chip non-contact surface and the gullet bottom portion, the dent portion recessed from the chip non-contact surface in an opposite direction to a moving direction of the band saw blade in order to increase a radius of a concave curved surface constituting a back side of the gullet bottom portion. A flat portion for dispersing stress concentration is provided at an innermost portion of the gullet portion. |
