Basic Study of the Surface Quality with Two-passage Oblique Cutting
摘要
Wood dust causes serious air pollution in the woodworking environment. Machining processes which do not require sanding to obtain a fine surface needed for some flat furniture parts is a more environmentally friendly process. A self-designed 2-passage surface planer with oblique angles of 15 and 20° used to machine China fir, hard maple, and red oak was examined by evaluating the surface quality. The machined surfaces were compared to those produced by sanding and planing. Results from this experiment showed the shaved thicknesses of 3 solid woods were always thicker than the preset cutting depth by about 0.007~0.016 mm for an oblique angle of 15°, and the shaved thicknesses did not significantly differ from the preset cutting depth for an oblique angle of 20°. The shape of the shaving of China fir was flat, while the others were spiral. The surface quality of the 3 solid woods machined by oblique angles of 15 and 20° were similar to that machined by sanding. The surface quality obtained by the 2-passage oblique cutting was better than that of the sanded surface. Further, it was found that the deformation layer caused by planing was removed by 2-passage oblique cutting according to observations of the roughness profile and SEM photos. The tactile impression of the obliquely cut surface was largely smoother than the sanded one.