SU82603A1 - Vibrator - Google Patents

Description

 Known vibrators for the study of vibrations in metal-cutting machine tools are made in the form of rotating masses, which are complex in design;

The proposed vibrator, in order to improve the design, is made in the form of a toothed disk connected to the machine spindle and an elastic plate in contact with the disk, mounted on the studied part of the machine.

FIG. 1 s. Schematically depicts a vibrator mounted on the frame of the machine under study; in fig. 2-vibrator, mounted on a caliper; in fig. The 3 curve of the dependence of the amplitude A on the oscillation frequency is obtained using a vibrator.

The vibrator consists of a toothed disk} fixed on the spindle2 2 of the machine, and an elastic plate 3 fixed on the research part of the machine and in contact with the disk tip 4 of a wear-resistant material.

Stiffness With elastic plate 5, one order of magnitude is selected.

where: p is the radial cutting force,

X - radial movement of the tool.

During rotation with different disk speeds /, the amplitude of the oscillations of the plate is measured and the curve of the dependence of the amplitude of oscillations on the frequency f is constructed,

where: n - the number of revolutions shpinddel per minute, g - the number of teeth of the disk.

The maximum value of the amplitude of oscillations corresponds to the natural frequency of oscillations of the studied part of the machine.

/ -.

- dx

f g - bGG

If, after determining the frequency (o), put the additional mass of the weight С on the studied part of the machine and then, for the second time, determine the natural frequency (og) with the help of the resonance curve

WITH,

. , 2g Y, G

-

  Shogde Cr) and to-given dynamic stiffness and parts. From here are determined

I -1 / Oo

2 I / „, (mass of the studied

If a resonance curve (Fig. 3) is determined for any part, then segment B, taken at a height of 0.7 from the maximum amplitude A, is equal to

S f f-. ..L / 1- „j -.

where Rf is the attenuation value of this part. Hence 2;: /,

Thus, with the help of a vibrator, the basic parameters of the machine oscillatory system are determined: natural frequencies, dynamic mass, stiffness and attenuation.

Subject invention

Vibrator for studying vibrations in metal-cutting machine tools, characterized in that, in order to simplify the design, it is designed as a toothed disk associated with a pin of the machine tool and an elastic plate in contact with the disk, mounted on the machine part (slide, frame, etc.). P.).

/ and

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