Simulation of the stock removal in the contact zone during internal grinding of brittle non-metallic materials

OBRABOTKAMETALLOV Vol. 23 No. 2 2021 technology Values of the probability of material removal when grinding holes in workpieces made of sitall z Values of the parameters of the contact zone in the radial direction (levels y) y = 0.1 t f y = 0.2 t f y = 0.3 t f y = 0.4 t f y = 0.5 t f y = 0.6 t f y = 0.7 t f y = 0.8 t f y = 0.9 t f –6.76 0.998 0.993 0.98 0.95 0.895 0.806 0.687 0.559 0.459 –5.07 1 0.999 0.999 0.994 0.975 0.92 0.806 0.642 0.486 –3.38 1 1 1 0.999 0.994 0.967 0.88 0.71 0.512 –1.69 1 1 1 1 0.999 0.986 0.926 0.764 0.536 0 1 1 1 1 1 0.994 0.954 0.809 0.56 1.69 1 1 1 1 1 0.998 0.972 0.845 0.582 3.38 1 1 1 1 1 0.999 0.983 0.874 0.603 5.07 1 1 1 1 1 1 0.989 0.898 0.623 6.76 1 1 1 1 1 1 0.993 0.917 0.642 Fig. 1. Change in the likelihood of material removal when grind- ing holes in sitall workpieces (hole diameter – 150 mm, tool AW 60 × 25 × 13 63C F90 M 7 BA 35 m / s, wheel speed – 35 m / s, workpiece speed – 0.25 m / s, 0, 00904 f t = mm , at levels: 0, 3 f y t = … 0, 9 f t ) be used for flat, cylindrical external and internal grinding schemes. Models provide an adequate description of the phenomena of stock removal for a wide range of cutting modes, the characteristics of the abrasive tool when grinding workpieces made of brittle non-metallic materials. Illustration of material removal when grinding holes in workpieces made of sitall (AC-370) with the AW 60 × 25 × 13 63C F90 M 7 BA tool 35 m / s (at a circle speed of 35 m / s, a workpiece speed of 0.25 m / s, longitudinal feed – 33 mm / s, cross feed – 0.008 mm / stroke) is shown in Fig. 1. Analysis of the data obtained shows that the peripheral speed of the tool and the rotation speed of the workpiece, which are directly included in the equation for calculating the probability of material removal,