3 608 878 300
Tightening Technology |
Bosch Rexroth AG
83
System 350
| 3 608 878 300/2019-03
Fig. 4–11:
Power diagram for a 3-step tightening process
If a torque/power curve such as in Fig.
is assumed, the average power is calculated as follows:
Tightening:
Pre-tightening:
Final tightening:
The power loss can be calculated using table
as well as the following formulas.
Table 4–15: Formula abbreviations for the calculation of total power loss
Formula abbreviations:
T
Cycle time
P
G
Base load, according to the equipment
t
1
Tightening cycle time
t
2
Pre-tightening duration
t
3
Final tightening duration
P
1
Tightening power loss
P
2
Pre-tightening power loss
P
3
Final tightening power loss
n
Number of channels
P
v
Power loss
Tightening
Pre-tightening
Final tightening
Base load
t
1
10
55min
1
–
---------------------
60s
1min
-------------
10,9s
=
=
P
1
P
1
6W
=
=
P
2
P
2, max
P
2, min
–
2
--------------------------------------
P
2, min
+
419 W
0 W
–
2
------------------------------------
0 W
+
210 W
=
=
=
t
2
1
20 min
1
–
-----------------------
60 s
1 min
--------------
3 s
=
=
t
3
0,5
20 min
1
–
-----------------------
60 s
1 min
--------------
1,5 s
=
=
P
3
P
3, max
P
3, min
–
2
--------------------------------------
P
3, min
+
838 W
419 W
–
2
-------------------------------------------
419 W
+
629 W
=
=
=
Summary of Contents for Rexroth Tightening System 350
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