Clamping Jaw Centrifugal Force - Optimum Optiturn TU 2807VB Betriebsanleitung

4.23.8 Clamping jaw centrifugal force

To calculate the required tensioning force for processing a workpiece, the centrifugal force of
the clamping jaws must be taken into account.
The permissible speeds can be determined in accordance with VDI Guideline 3106 "Determin-
ing the permissible speed for lathe chucks (jaw chucks). This guideline also allows for the resid-
ual tensioning force at a specified speed to be determined.
Base tensioning force
Required minimum tensioning force
The required effective clamping force for machining F
machining force F
spz
calculation of the clamping force.
According to VDI 3106, the following also applies here:
F = F · S [ N ]
sp spz z
From this we can derive the calculation of the initial clamping force during shutdown:
F = S · (F ± F
sp0 sp sp
ATTENTION!
This calculated force must not be larger than the maximum clamping force ∑
on the chuck.
From the above formula it is evident that the sum of the effective clamping force F
total centrifugal force F
According to VDI 3106, the following also applies here:
The total centrifugal force F
center of gravity radius and the RPM.
Version 1.0 - 2020-12-22
Speed
with the safety factor S . This factor takes into account uncertainties in the
z
- for gripping from the outside in
) [ N ]
c
+ for gripping from the inside out
is multiplied by the safety factor for the clamping force S
c
is dependent both on the sum of the masses of all jaws and on the
c
Translation of original instruction
Fc Centrifugal force in N
m Mass in kg/set
rs Centre of gravity distance to the centre of the chuck in
metres
n -1
Speed min
r Centre of gravity distance to the clamping jaw
0
is calculated from the product of the
sp
S ≥ 1.5
sp
Workpiece is
released uncontrollably
engraved
S
and the
sp
.
sp
3440287│3442710│3442712 GB
145