Influence of forms and cutting edge front surface knife indicators for power reduction of wood

Abstract

The integrated use of wood has been and remains one-Noah of the most relevant for industries engaged in the workpiece, the first customer handling and processing of timber.1 So far, in all of Russia is beneficial not used half, and separately in Siberia up to two-thirds of the biomass of a tree.2 The AAC, which reaches across the country 550Mm3/year, is used in average only 35%.3 Production of almost all technological operations in forestry development, treatment or processing of wood due to the formation of wood waste are secondary wood resources. From them or with their supplements can produce new products.4 Wood wastes are lump (solid) and soft (sawdust, shavings, dust).5 Wood waste depends on the type and location of their formation.4 By wastes include logging residues (twigs, branches, stubs, crown, thin-Dimensional illiquid wood, tree trunks and debris and al.), Their volume is 22... 26%.5 On woodworking enterprises is gor-were slats otkomlevki, trim, shavings, chips, their volume 25% and above.5 On plywood is pencils, veneer-flaw, trimming the logs, bark, sawdust, plywood trimming, dust, etc., and their volume of 50... 55%.5 Waste container production reach 32% -46 parquet] 0. By % whisker [kovye waste timber cutting in the country is processed mainly in the wood chips,6 is used for this disc and drum chippers.7 Rational primary grinding process timber opredelyaet-Xia minimum power consumption and a good cut quality, producing a specified particle size timber.8 With decreasing thickness the chip cut by cutting the specific work (work expended on the conversion per unit volume in the chips drevesius) increases due to the fact that for the separation of any volume dreVecino into fine particles is required to expend more work than in the deletion Research Institute for larger. Thus, from the standpoint of reducing power consumption for cutting if necessary converted into a certain amount of wood chips is more advantageous to cut thick chips, remembering that the quality of the treated surface thus deteriorating.9 In some industries (e.g., woodcement materials GOST P 54854-2011, hydrolysis -OGST 18320-78, solid n-biotite Lebanon GOST 54220-2010 and 55553-2013 GOST, polymer composite materials GOST 16361-87) quality requirements chopped dre-Vecino dimensions limited primarily wood particles and impurities containing Niemi. In order to reduce power consumption for cutting during the initial comminution timber for the above production iz must grow shallow wood chips in a large thickness, and power rates to the process of grinding in this case are basic. As an equipment for grinding wood cutting primenyayut special particle machines, which differ in the structure of the cutting mechanism and the feeder and appointment view feedstock.10 Particle machines are of the following types of cutting mechanism design: bowls, milling, disc, drum, rotor-channels.11 A cutting mechanism equipped with cutting tools bonded instruments in the form of knives, cutters, teeth, finding optimal parameters of which is the subject of research. The purpose of this study determination of the optimum shape PE cementitious tool (knife) in dependence on the geometrical shape of its PE zhuschey edge and the rake face when a primary grinding drevesi us milling in the axial, radial and tangential directions to obtain the desired chip size.