Page 16 - May
P. 16
METALWORKING EQUIPMENT AND TOOLS
The spindle unit (SHU) of TNL-100AL and TNL-120AL2 machines is a rotor on two supports
(Fig. 3): in the front support, a double-row radial roller bearing in combination with an axial
radial ball bearing; in the rear support double-row radial roller bearing.
Fig. 3. Spindle unit of the TNL-120AL2 machine.
Experimental studies of both machines by the method of pulsed loading [7 - 9] made
it possible to compare the frequency characteristics of their SHU. Amplitude-frequency
characteristics (AFC) for acceleration were obtained, and then, by means of double integration
(to raise the low-frequency components), AFC for displacement was determined (Fig. 4). The
characteristics of the "old" and "new" machine are superimposed on each other for ease of
comparison
The amplitude-frequency characteristics of the control box of two machines (Fig. 4)
indicate that the natural frequency of the control box of the "old" machine is lower (315 Hz)
than that of the "new" one (380 Hz). The dynamic compliance at natural frequencies of the "old"
machine is almost 1.5 times higher than that of the "new" (5.14 and 3.44 units, respectively),
that is, the "old" machine has both a lower frequency and a higher compliance.
16 Stanochniy park
