WEAR CHARACTERISTICS OF CUTTING TEETH OF THE TOOL IN MILLING RECTANGULAR GROOVES IN MEDIUM-DENSITY COMPOSITE WOOD MATERIALS

The article investigates the wear characteristics of the cutting teeth of disc-type milling cutters used for milling rectangular grooves in medium-density composite wood materials, considering their dependence on material density and cutting speed. Empirical formulas were derived by constructing comparative graphs of the relationships between the quantitative deformation parameters of the cutter teeth during the milling of composite wood samples with varying densities. Using these formulas, the wear parameters of the disc-type cutter teeth were theoretically calculated. The obtained results were compared with experimental data from the study, and changes in wear characteristics during repeated wear cycles were analyzed. The research also established that the anisotropy of composite wood materials, alongside other technological factors, causes uneven wear of the cutter teeth. The anisotropy is attributed to variations in the physical-mechanical properties within the wood particles, uneven distribution of resin adhesive compositions, and the formation of voids in areas with high resin accumulation during the drying stage of the board production process. Furthermore, the use of diverse raw materials such as different wood species and other wood/non-wood waste materials in composite wood production accentuates anisotropic properties. During cutting, the cutter teeth continuously encounter surfaces with varying characteristics, exacerbating the non-uniform wear process. Additionally, it was observed that the cutting speed of the milling cutter varies depending on environmental conditions. Increased cutting speed leads to uneven wear of the cutter teeth, resulting in tool vibration and, consequently, greater geometric dimensional inaccuracies in the milled grooves.