Page 293 - Modular design for machine tools

252 Engineering Design for Machine Tool Joints

Expressions

(Groth, 1972 [39])

(Tsutsumi & Ito,
(Reshetov &
Levina, 1956 [38]) (Dekoninck, 1972 [40]) 1980 [41])

1960 1970 1980 1990 2000
(Rogers & Boothroyd, (Beards &
1975 [25]) Neroutsopoulos,
Hysteresis loop 1980 [43])
Loss factor of
EDM joint
(Hashimoto &
Kume, 1972 [42]) Hysteresis loop, vibration
Vibration transmittability transmittability, loss
factor and so on
Figure 6-25 Firsthand view for research into expressions for damping.

To this end, a firsthand view of research into the expression of damp-
ing is given in Fig. 6-25. Within this view, we can find the interesting
report. For instance, Hashimoto and Kume investigated the transmission
characteristics of the torsional vibration through the lubricated coni-
cal joint, i.e., tapered cylinder- to-bush joint, which is made of mild steel
and with surface roughness of 6 m in R max . In accordance with their
report, the response waves change to the rectangular form from sinu-
soidal form, when occurring the gross slip, and it depends upon the
interface pressure and amplitude of the exciting vibration. As is easily
understood, the rectangular response disappears with increasing interface
pressure.

6.4.2 Representative research into
dynamic behavior
Figure 6-26 is a firsthand view of the representative researches into the
dynamic behavior of the machine tool joint (see alternately Fig. 6-25).
Except for those of Schaible and Burdekin, the research activities were
carried out using the joint under normal dynamic loading, and they
were two-pronged: one is for the single flat type, and the other is for
multiple-laminated flat type. Of these, the multiple-laminated joint con-
sisting of nine stacked hollow disks is first employed by Reshetov and