3 608 878 300 Tightening Technology | Bosch Rexroth AG 87/641
System 350 | 3 608 878 300/2019-03
Example • Size 5 tightening spindle with 5GE68 planetary gearbox and the following output drives:
– GK3C…/GL3C… or VNK3C…/VNL3C… with transmission ratio 1
– Tightening torque 400Nm
A maximum output drive speed of 145min
–1
is possible with a GK3C…/GL3C… or VNK3C…/VNL3C…
output drive with transmission ratio 1.
The following tightening steps are programmed:
• Tightening angle of turn 3600° (10 turns), speed 55 min
–1
• Pre-tightening torque 200 Nm, speed 20 min
–1
• Synchronization of the tightening channels
• End tightening angle of turn 180°, speed 20 min
–1
This results in a minimum cycle time of:
t
cycle
= t
tight
+ t
pre
+ t
end
= 5 + 3 + 1.5 = 9.5 sec
Fig. 4–16: Maximum performance of a tightening channel (left) and maximum possible tightening torque depending on cycle time
and tightening case hardness (right) with different output drive (VUK3D...)
In the left diagram, a tightening torque of 400 Nm results in a maximum speed of 22 min
–1
.
With a speed of 20 min
–1
, the maximum performance is not exceeded.
In the right diagram, a pure tightening torque pre-tightening and final tightening is specified with 4.5 sec
altogether. A tightening torque of 400 Nm and soft tightening case (see definition on page 64) result in
a minimum cycle time of 16sec. With an estimated angle of turn of 180° for final tightening (50 - 100
% of the final tightening torque), the tightening case has to be classified between hard and soft, thus, the
minimum cycle time is lower than the one read from the diagram.
Heat dissipation is possible during the required cycle time of 20 s.
100 15050
23
2000
200
n [1/min]
300
10 0
400
500
600
700
T [ Nm]
0
500
400
300
200
4812 20
10 0
s
t [s]
T [ Nm]
600
700
5GE68+VUK3D…
5GE68+VNK3C…
22
16
– Max. heat dissipation capacity of the servo amplifier installed in the BT356
- - - Max. heat dissipation capacity of the motor
– Hard tightening case
– Soft tightening case
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