Operating Manual
Tangential Rolling System T18F - T27F
33
www.lmt-fette.com
If the determined values initially indicate that the calculated tangential force is too
great for the respective machine, a lower tangential force can be achieved by chang-
ing the number of workpiece rotations (max. 35).
Drive power and torque
The drive power of the spindle is generally large enough because the thread is created
with several workpiece rotations during the tangential rolling method.
The drive power N is calculated as
follows:
N = 0.105 · 10
–5
· n · F
T
[kW]
The drive torque is calculated as
follows:
M = 0.01 · F
T
[Nm]
6.5
Rolling time
The rolling time t
r
is the result of the time t
v
spent moving with working feed plus the
dwell time t
d
on the workpiece. The times can be calculated on the basis of the spindle
RPM n or the selected rolling speed v.
When the workpiece RPM forms the basis of calculation:
t
r
= t
v
+ t
d
= 60
___
n · (n
w
+ n
d
) [s]
When the rolling speed forms the
basis of calculation:
t
r
= t
v
+ t
d
= 0.06 · d
A
·
π
___________
v
· (n
w
+ n
d
) [s]
Calculation example (continued):
Thread
M22 x 2.5
Workpiece RPM
n = 480 1/min
F
T
= 4391.8 N
N = 0.105 · 10
–5
· 480 · 4391.8 kW = 2.21 kW
M = 0.01 · 4391.8 Nm = 43.92 Nm
Calculation example:
Thread
M16 x 1.5
Initial diameter
d
A
= 14.97 mm
Spindle RPM
n = 635 1/min
Rolling speed
v = 30 m/min
Number of workpiece rotations n
W
= 20
Dwell time rotations
n
d
= 3
t
r
= t
v
+ t
d
= 60
____
635
· (20 + 3)s = 2.17 s
oder
t
r
= t
v
+ t
d
= 0.06 · 14.97 ·
π
______________
30
· (20 + 3)s = 2.16 s
LMT_Bedienungsanleitung_T18F_T27F_e.indd 33
02.08.11 17:40