Khoroshailo V. Improving the efficiency of boring holes on the turning lathes by creating a vibrationproof tool system

The object of study is the process of boring holes of large diameters on turning lathes. The subject of the research is functional relationships between the parameters of the vibration of the boring cutters and the parameters of precision, quality and processing performance. The research methods are: Theoretical researches are made on the basis of fundamental concepts of mathematics, structural resistance, dynamics, theory of cutting, designing of machines and tools. The dissertation applied analytical and three-dimensional modeling, finite element method, implemented in computer systems of design and engineering analysis. Experimental studies were carried out in laboratory and production conditions. The experimental data was carried out using modern methods of mathematical statistics. Novelty is the mathematical model of oscillations of a boring cutter, which allows for the first time to predict the effect of stiffness of the tool system with an additional movable support of the cutter on the amplitude of the vibration process of boring ; the tool system for boring on turning lathes, which provides the increased vibration resistance of cutting process due to two supports of fastening tool is developed for the first time; a three-dimensional model of the tool system for boring, which allows to estimate influence of elastic deformation on the dynamic characteristics of the tool boring is developed; the influence of the use of the developed tool system for boring on improving the accuracy, quality and processing performance for large diameters holes on turning lathes is established.