Analysis of the influence of grain radius and critical rake angle on the critical cut thickness during sanding wood materials

The processing of blanks and parts made of wood and wood materials with abrasive tools are the most difficult process in terms of description and modeling. The patterns of wear of an abrasive tool are directly related to the work of individual abrasive grains. The wear mechanism is based on the phenomena of adhesion, diffusion, abrasive destruction, plastic flow of the thinnest surface layers softened under the action of high contact temperatures and pressures, chemical impact on the abrasive of the environment and the material being processed. Under the action of mechanical and thermal stresses, cracking, chipping of the cutting edges, chipping of individual abrasive grains and entire complexes from the bond occurs. In the course of experimental studies of the process of calibrating–grinding wood materials, it was revealed that in some cases contact damage appears on the surface of the sample, in the form of points, scratches, spots covered with pile. Previously, it was believed that the main defect of mechanical processing by cutting wood materials is the burns of the surface layer, however, it is necessary to pay attention to the fact that contact destruction of the surface layers is observed long before the appearance of burns and has a primary effect on the quality of the machined surface. The objective of this study is to explain the mechanism of formation of contact damage by analyzing the process of microcutting wood materials with a single abrasive grain, to determine the cutting conditions that do not allow the appearance of contact damage. In the course of experimental studies of the process Since it is known from experimental studies that the formation of contact fractures is influenced by such regime factors as cutting speed and feed, abrasive grain size, grinding depth and cut thickness, it is necessary to derive a mathematical dependence reflecting the influence of these factors on the quality indicators of the process. Grinding in order to be able to pre-calculate the optimal cutting conditions, preventing the appearance of contact damage on the machined surface.

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