Analyses of Rotating Disc Cutting of Wood
摘要
The high dynamic bias angle introduced by the rotating disc cutter increases the sharpness of the tool, thus reducing the cutting force and improving cutting quality. In this study, a carbide disc cutter was applied to the wood of red oak (Quercus sp.), and the influences of the dynamic bias angle on the components of cutting force and the coefficients of friction between the tool face and chip were analyzed. The effect of the rotating speed of cutter on the cutting energy is also discussed. The results indicated that the cutting force component parallel to the knife edge (Fx') decreased as the tangent of the dynamic bias angle (tan λ’) increased. The force component (Fy') when cutting normal to the knife face was independent of tan λ’. The cutting force component (Fz') on the knife face and that normal to the knife edge decreased with increasing tan λ’. The coefficient of friction between the knife face and chip was independent of tan λ’. The dynamic bias angle introduced from the rotating disc cutting approached 90°. A negative relationship existed between the specific cutting energy and the depth of cut, and the energy increased with the rotating speed of the disc cutter.