Page 16 - Апрель

METALWORKING EQUIPMENT AND TOOLS

Figure 2 shows the histograms of the results of the analysis of vibrations recorded in the
process of grinding the spline shaft at the finishing and nursing passes. The maximum values of
the amplitudes Аmax in the spectra at the frequency f = 50 Hz, corresponding to the revolving
frequency of the wheel (nKP = 3000 min), as well as the values of the standard deviation RMS
and the sum of the first ten values of the amplitudes
characterizing the roughness of the treated surface.

мкм
fine
sparkout

experience
number
мкм
fine
sparkout

The natural frequencies of the dynamic experience
number
system of the machine are significantly мкм
higher than the fundamental frequency of
the disturbing excitation (45 ... 52 Hz), the fine
response of the system in this case will be sparkout
determined not by the dynamic, but by the
static characteristic of the elastic system of
the machine. Therefore, when constructing a experience
design scheme for a spline grinding machine number
and a model for shaping during spline Fig. 2. The results of the analysis of the spectrograms of
vibrations during grinding of the internal spline shaft diameter
grinding, for further accuracy calculations, it in various ways.
is permissible to take into account only static
displacements of the elements of the elastic
system of the machine.
Analysis of the forced vibration spectra
for various spline-grinding schemes showed that the maximum amplitude values for all
machining schemes are an order of magnitude less than the deviations from straightness in the
longitudinal direction and practically affect only the roughness of the machined surface. The
control of the roughness of the processed surface was carried out using a profiler-profilometer
model 250 (Caliber), and the control of straightness using a straight meter BV-6249. The
research results formed the basis of the developed software package for a computer [14], which
allows predicting the processing accuracy of spline shafts.

16 Stanochniy park