Pavlyuk R. Increase of the stability of the tooth milling of steel saws by sharpening with abrasive circle with a continuous working surface

The object of the study is the process of sharpening the teeth of woodcutting saws with abrasive discs with a discontinuous working surface. The purpose of the work is to increase the stability of the steel teeth toothpick due to the development of scientific and practical recommendations for their sharpening with abrasive circles with a breakable working surface. Research methods. In dissertation work: analytical methods of studying the distribution of temperature fields and deformations on the surface of the tooth; theoretical bases of grinding with abrasive circles with an interrupted cutting surface; mathematical planning of an experiment with many factors; the method of regression analysis of the processing of experimental results; computer 3D modeling; thermoelectric method of temperature measurement; Optical method for measuring deformations. Scientific novelty of the obtained results. For the first time a mathematical model of a new abrasive disc with a breakable working surface was developed, which takes into account the time of thermal saturation of the saw blade surface and allows us to determine the rational length of the working surface of the circle. The mathematical model of determining the index of evaluation of the resistance of saws to the operation - the area of the blade of the teeth depends on the cutting path and the number of breaks of the abrasive wheel, on the basis of which the boundary of the blades and the length of the cutting path for the steel saws, sharpened by continuous and abrasive abrasive circles, are determined. Regressive dependences were obtained to determine the temperature, hardness and roughness on the surface of the saw blade during aging, depending on the number of abrasive disc breaks, injection rates and cutting speeds, which enable prediction of the quality of sharpening of steel saws and establish rational regimes of this process. The method of determining the boundary path of cutting on the basis of the obtained dependence of the area of the blade's cutting of the saw teeth on the cutting path is improved, which makes it possible to determine the period of stability with respect to the action of steel saws. The practical value of the results. Applying the results of the dissertation work allows to increase the resistance to the sprocking of the steel teeth and remove the squeezed surfaces, to remove the bulging on the edges, to eliminate the deflection and bending of the blade. The developed recommendations for the production of prefabricated abrasive wheels and aggravation modes allow to reduce the time for the acute operation, increase the period of resistance of the saw to trigger, increase the productivity of machine tools for sawing logs and sawn timber. USES: woodworking industry.