Antonenko Y. Increasing the accuracy of heavy lathes by controlling the parameters of the carrier system

In the thesis, the problem of increasing the accuracy of machining large-sized parts was determined and scientifically justified and solved by improving the design of the carrier system of heavy CNC lathe of increased accuracy. There were analyzed themethods for increasing the accuracy of the technological system, the structure of the appearance of errors in the processing of nonrigid details. Structural and functional models for controlling the accuracy of a heavy machine tool were developed. There was developed a model for the operation of a carrier system of heavy lathe, taking into account elastic and thermal deformations. The methods of controlling the accuracy of a heavy lathe with feedback on the components of the carrier system, the predicted deviations, the measured parameters of the machining process were developed for the first time. There was developed a method for assembling the frames of heavy lathes with a system of forces, distributed loads acting on the machine in the process of its operation, ensuring minimum deviations of the base surfaces and the possibility of perceiving increased loads from the mass of the workpiece and cutting forces. An adaptive control system that allows to compensate the elastic deformations of all elements of the technological system that arise under the influence of cutting forces, as well as thermal deformations caused by temperature changes after the start of the machining process was proposed. The results of the work were implemented in the development of heavy lathes of the new generation, as well as in the modernization of heavy lathes. Recommendations for the design of carrier systems of heavy lathes with CNC of increased accuracy have been developed and implemented. The recommendations for increasing the competitiveness of heavy lathes have been developed.