| 摘要 |
<p>Provided is a rotary cutting tool with which it is possible to increase the flexural rigidity of an entire blade, even if the blade is thin. A cutter head for woodwork is provided with attachment grooves at four locations along the outer perimeter of a main body in the circumferential direction. The attachment grooves are slightly curved outward in the direction opposite from the rotary direction of the main body, and opposing sides of the main body are symmetrical in shape. A blade and a pressing fitting are mounted to each attachment groove. The blades are made of steel or cemented carbide, and are elastically deformable long, thin plates having a substantially rectangular shape with a thickness of approximately 0.5 mm. These blades are fixed so as to curve in an arc shape in the direction opposite from the rotary direction (R) and match the shape of the attachment groove. A twist angle, which is the inclination angle of the outer circumferential surface of the main body of the cutting blade with respect to the mandrel, is a negative twist angle that varies in curve at one end surface side of the main body, and is a positive twist angle that varies in curve at the other end surface side.</p> |
