Veremey G. The efficiency increasing of the valve seats' overhauled process in auto repairing production

In the dissertation work the current problem of the efficiency increasing for the valve seats' overhauled process in auto repairing production was solved. It has been implemented due to increase and labor intensity reduce of working by the development of new technological equipment, as well as better use of the cutting tool and its material. A method of forming surfaces for the valve seat while simultaneous by copied boring of the three conical surfaces with oriented tool was proposed, the usage of which can significantly reduce the complexity of the overhauled process, eliminate manual operations of lapping and improve surface quality. The overhauled equipment based on pneumatic bag was designed and manufactured. It improves the accuracy of the valve seats processing due to the introduction of the original design and technological solutions. The designed equipment was introduced in the current auto repairing production and educational process of the university. The assessment method for the worn surfaces state of the valve seat in the problem of flaw detection was proposed, which allowed to improve the accuracy and eliminate the error of the overhauled process. The general and partial modular 3D models of: the forming process, the flaw detection problem, describe the geometry of surfaces with complicated - variable topography, optimization of processing parameters was designed. The analytical and experimental dependences for the processing parameters on the surface quality rates were obtained. On their basis was made the practical advice on choosing the optimum cutting conditions when overhauling valve seats. The results for precise increasing of the overhauled valve seats' process, tested on the engine with the diagnostic equipment, allowed to reach improve of the experimental engine performance.