Search for optimal characteristic of high porosity nitride boron wheels under aircraft factory auxiliary process flat grinding
https://doi.org/10.21285/1814-3520-2020-1-77-84
Abstract
The purpose of the paper is to study the parameters of surface micro- and macro-geometry of high-speed R9M4K8 plates when grinding by high-porosity wheels made of cubic boron nitride. The quality of the ground surface is estimated using the following selected parameters: Ra (arithmetic mean of profile deviation) , Sm (average pitch of profile irregularities - micro-deviations) and EFEmax(flatness deviation - macro-deviations). Quality is assessed using the expected medians along with the categorical values for the roughness parameters and the accuracy degree for macro-deviations. The formation stability of these parameters is analyzed. Stability is assessed using the quartile latitudes of the non-parametric statistical method. The application of high-porosity wheels made of cubic boron nitride for grinding complex alloyed high-speed steels is justified. These wheels allow to reduce the temperature in the cutting zone and improve grinding efficiency. The expediency of using the probability-theoretic methods for evaluating the high-speed plate grinding is shown. A nonparametric statistical method, for which observations turned out to be "their own field" is chosen in the accepted technological conditions. The quality of the ground plates is evaluated by means of the nonparametric statistical method. The influence of high-porosity CBN wheel permeability on process stability is confirmed. Technological recommendations for selecting the pore sizes of high-porosity CBN wheels are given. The pore former KF40 surpasses the pore former KF25 in process reproducibility. Grinding by the wheel CBN30 B126 100 L V K27 KF40 ensures the best quality of R9M4K8 high-speed inserts and demonstrates its high formation stability. When grinding with this tool, the following surface quality parameters are achieved: Ra 0.29 (0.32), Sm 79.00 (80), EFEmax 11.50 (7).
About the Authors
Y. I. Soler
Irkutsk National Research Technical University
Russian Federation
Russian Federation
A. I. Shustov
Irkutsk National Research Technical University
Russian Federation
Russian Federation
Review
For citations:
Soler Y.I., Shustov A.I. Search for optimal characteristic of high porosity nitride boron wheels under aircraft factory auxiliary process flat grinding. Proceedings of Irkutsk State Technical University. 2020;24(1):77-84. (In Russ.) https://doi.org/10.21285/1814-3520-2020-1-77-84
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