Sandvik Coromant Silent tools - How to reduce vibration in metal cutting - Manual (Page 28)

A
B
C
Sandvik Coromant – How to reduce vibration in metal cutting 24
or the diameter at the front end of the bar will contribute towards mini-
mizing the vibration tendency.
Damped boring bars – Silent Tools - include tools that are pre-tuned to
the correct frequency in relation to the tool length. This basically means
setting up the damped boring bar and the machine to be set up the same as
a conventional, solid boring bar.
The pre-tuning system of the damped bar consists mainly of a
heavy tuning body (
A
) with a certain inertia mass, suspended
in two rubber bushes (
B
), one at each end of the tuning
body. The tuning body is surrounded by a special
oily liquid (
C
). If vibration tendencies should
arise during the machining process
using a damped bar, the dampening
system will immediately come into
force, and the movement-energy of
the bar will be absorbed into the
tuning system. As a result, vibration is minimized and machining per-
formance maintained or improved.
Q. Metal removal rate (cm3/min)
1. Solid steel bar
2. Carbide alloy bar
3. Short, damped bar 4. Long, damped bar
5. Extra long, damped bar