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METALWORKING EQUIPMENT AND TOOLS

Findings
Thus, the best surface quality is obtained with counter double-sided spline grinding
(the maximum profile height according to GOST 2789-73 is not more than 0.27 microns), the
maximum amplitude values in the vibration spectrum are an order of magnitude less deviations
from straightness. A further increase in the machining accuracy on a machine for double-
sided spline grinding can be ensured by increasing the rigidity of the carriage and the spindle
assembly in the tool subsystem and the rigidity of the mandrel attachment points in the work
piece subsystem, since the natural frequencies of the dynamic system of the machine 217 and
394 Hz are significantly higher than the fundamental frequency of the disturbing effect ( f = 45
- 52 Hz). The maximum values of the amplitudes in the spectrum of forced vibrations of the tool
and work piece in the process of both one-sided and double-sided spline grinding is an order
of magnitude smaller than the values of the shape errors in the longitudinal section obtained
after processing by different methods, and practically do not affect the deviations (less than
10%) of the shape and location of the splines. Residual imbalance of the grinding wheel during
double-sided spline grinding is a source of forced vibrations, which has the strongest effect on
the surface quality in all methods of machining on the machine.

B.Associate Professor Department of machine tools MSTU Stankin.
F.S. Sabirov, Doctor of Technical Sciences,
Professor of Department of machine tools MSTU Stankin.
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