Buhovets V. Complex self adjusting tooling for high efficiency clamping and multi cut machining

The thesis deals with the creation and research of complex self adjusting tool accessories for high efficiency clamping and multi cut machining. The basics of using a multi-tool adaptive-type accessories in combination with a self-regulating work piece clamping have been developed and scientifically based. Combining uniform clamping and multi-tool cutting of adaptive type in a single integrated system of increased productivity, reliability and vibration resistance will allow to achieve a number of positive effects, such as increase the machining accuracy, its efficiency and quality, grinding the continuous chips. In this regard, structural schemes of multi-edge self-adjusting systems for turning with an extended range and a uniformly distributed clamping force and adaptive-type equalizing of cutting forces have been developed. An analytical model has been developed on the basis of a variation method for calculating the machines accuracy. This model made it possible to evaluate the influence of the errors of the components of the integrated self-adjusting tooling resulting from the force effect from the cutting process and the clamping device, on the initial accuracy of the machined cylindrical surfaces of the cantilever parts. Dependencies are derived for determining small linear displacements and rotation angles caused by transverse jamming of the work piece in the chuck and small linear displacements caused by deformations of the cutting blocks under the action of the cutting force components. Respectively, deviations of the radius of the cylindrical surface of the part in angle of rotation and small linear displacements were obtained. According to the simulation results, the constancy of the deviation of the radius of the cylindrical surface of the part along the length in certain angular positions was established. As a result of analytical and computer modeling, the dependences of the clamping range of work pieces in the chucks with different types of sleeve elements of the clamp on the wall thickness and the power load from the clamp drive side are developed, and pictures of their stress-strain state are obtained. The analysis of the multi-edge system dynamic stability of the self-adjusting machining confirmed the increase in resistance against self-oscillations together with the uniform clamping of work pieces compared to single-cut turning.