INCREASE EFFICIENCY OF INTERRUPTED GRINDING PROCESS
DOI:
https://doi.org/10.20998/2078-7405.2019.90.18Keywords:
parametric instability, intermittent lap, grinding temperature, discontinuity factor, cutting area, elastic system of the machine.Abstract
. Grinding is the most common method for machining hardened steel parts. However, due to the high thermal stress of the grinding process, various defects appear on the machined surfaces, significantly reducing the operational reliability of the parts produced. One of the effective ways to improve the quality of the surface layer and the performance of grinding is the use of abrasive tools with a discontinuous working surface. But the incorrect application of these circles often leads to the formation of additional defects on the surfaces being treated — waviness and technical burns. The article reveals the conditions for the deterioration of the geometric and physico-mechanical parameters of the quality of the surface layer of parts in the grinding operation with abrasive wheels with a discontinuous working surface. The ways of improving the quality of the surface layer of parts with intermittent grinding are proposed. It has been established that when grinding with a discontinuous circle with grooves parallel to the tool axis, it is very difficult to prevent the occurrence of grinding defects due to constantly changing processing conditions (changing the parameters of the cutting mode, filling the working surface of the wheel), resulting in the appearance of parametric grinding in the elastic surface grinding machine. On the basis of theoretical and experimental studies, the expediency of using abrasive wheels with spiral grooves or inclined grooves on working surfaces in an operation is determined.References
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