Determination of the influence of rock and grinding modes on the surface roughness of wood

Abstract

Experimental studies of the influence of wood species and grinding modes on the roughness of the obtained surface were carried out. It is investigated that the type of wood also affects the magnitude of the irregularities of the surface to be treated, namely the magnitude of the roughness of the treated surface is inversely proportional to the density of the treated material. Regression models are obtained, which characterize the roughness of the surface of oak and spruce wood depending on the cutting speed and the specific pressure of pressing. It is established that the cutting speed has a positive effect on the roughness of the treated surface. This is due to the fact that at high cutting speeds wood fibers (especially relevant for hardwoods with higher density) show proper support to the cutter and do not have time to break under its pressure, and cut with a cutter before it breaks their connection with neighboring fibers. Therefore, the purity of the treated surface will be better. It is established that with the increase of cutting speed from 10 to 30 m / s by grinding skin of oak wood surface roughness decreases by 40-60%, and spruce - by 44-86%. Spruce has a 10-20% roughness dynamics than oak. It was found that with the increase of the specific pressure of pressing the part to the sanding skin on the surface of oak wood, the surface roughness increases by 20-30%, and the surface of spruce wood - by 12-32%. In spruce, the deterioration of roughness is 12-13% greater than in oak. It is established that with the increase of the feed rate on the surface of oak wood the surface roughness increases by 21-30%, in spruce - by 13.63-23.46%. In spruce deterioration of roughness by 9-13% more than in oak. To carry out effective grinding to obtain a quality surface (such as oak and spruce), the following input values are recommended: cutting speed 20-30 m / s; feed speed 6-8 m / min; specific clamping force 2.2-4.4 kPa; grain size of skins: P180-P150; P120-P100; P90-P60.