Research On Vibration Characteristic Of Slender Shaft In Turning Process

During the machining process of slender shaft, due to its length to diameter ratio is morethan20,bending deformation and vibration phenomenon is occurred easily. Since thevibration factor has a great influence on the machining accuracy of slender shaft, it shortensthe service life of machining tool, when the vibration becomes severe, the workpiece and toolappear loosened phenomenon, while large noise generates a serious impact on people’sphysical and mental health. However, the machining precision is required higher in modernmanufacturing industry, the machining error caused by vibration factor has not beeneffectively reduced, therefore taking effective processing method for reducing vibration errorin the processing of slender shaft has far-reaching significant.This article mainly researches on the dynamic characteristics of slender shaft in theturning process, especially the radial bending deformation is affected by the vibrationphenomenon, through the establishment of radial bending vibration model of slender shaft,solving the natural frequencies and vibration mode function of slender shaft, using thenumerical simulation software Matlab solves the bending curve of slender shaft vibrationmode function, proving the orthogonality of the vibration mode function, combining with theboundary conditions of beam model which is simplified by slender shaft’s fixed end andhinged end, solving the vibration response curve of machining slender shaft.Based on the ordinary machining process, establishing the vibration bending model ofslender shaft which is machined with double tools, solving the vibration response curve ofmachining slender shaft with dual-tools, through the comparison of vibration response curveof slender shaft machining with ordinary method and double tools method, ignoring the smallspace of double tools machining, getting the relationship of vibration response curvemachining with ordinary method and double tools method.Through introducing the related theory and specific steps of modal analysis, usingthe simulation analysis software ANSYS solves the natural frequency and vibration modediagram of slender shaft, verifying the accuracy of the theoretical formula solves the naturalfrequency of slender shaft, and the similarity of vibration mode between ANSYS simulationanalysis and Matlab numerical simulation, analysis the vibration mode of slender shaft’snatural frequency, getting the conclusion that in the quarter, half, three-quarters of slendershaft, the bending deformation is the largest, using the finite element simulation softwaresolves the vibration mode of slender shaft machining with single and double tools atcorresponding location, getting the bending deformation graph of slender shaft withconcentrated load, through the comparison of bending deformation graph of slender shaftmachining with ordinary method and double tools method, getting the relationship of them.Introducing the related theory and concrete steps of harmonic response analysis, usingthe simulation analysis software ANSYS solves the harmonic response curve in the quarter, half, three-quarters of slender shaft, through comparing the maximum value of harmonicresponse curve machining with ordinary method and double tools method, getting therelationship of them, verifying the accuracy of vibration response curves.