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Flex Cam
Step 4b
Size and stroke of the Power Unit
for different Cam Unit sizes
The total volume of oil in the Cam Units should be cal-
culated using the following formula. The total volume
of oil is the sum of all the volumes for all Cam Units.
The volume is the product of the piston surfaces and
strokes used. The total volume of oil V
Units corresponds to the minimum volume of oil for the
3
Cam Units (in dm
). A
is the piston surface area in the
N
2
Cam Unit (dm
) as shown in table 2.
V
= [(A
s
) + (A
s
) ... (A
N
1
1
2
2
A
= Piston surface area of Cam Units
N
s
= Stroke length of Cam Units
N
WK AZ AK
15 kN 40 kN 60 kN 90 kN 150 kN
2
A
(dm
)
0,13
0,31
N
Tab. 2: Piston surface area of Cam Units
Total volume of oil of Cam Units: V
WK = Compact Cam 2018.11.
AZ = Force Cylinder 2018.30.
AK = Flange Cams 2018.12.
Select the appropriate Power Unit from Table 3.
The Power Unit must supply the minimum volume of
oil as calculated above. Calculate the required Power
Unit stroke s
using the following formula:
Gerf
s
= [(V
: V
) s
] + 10
Gerf
N
G
G
V
= Total volume of oil of Cam Units
N
V
= Total volume of oil of Power Unit
G
s
= Power Unit stroke
G
s
= Power Unit stroke required
Gerf
Stroke Nominal
Power Unit size 2018.20.
length stroke length s
15 kN
G
.035
25
0,031
.060
50
0,063
.110
100
0,126
.160
150
0,188
Tab. 3: Volume of oil of Power Unit V
Power Unit stroke used: s
Gerf
Example:
Select a Power Unit to operate a Compact Cam
2018.11.01500.049 and a Force Cylinder
2018.30.04000.050 with a used working stroke of just
40 mm.
V
= [(A
s
) + (A
N
WK
WK
AZ
V
= [(0,13 49) + (0,31 40)] : 100
N
V
= 0,189
N
14
for the Power
N
s
)] : 100
(Formula 1)
N
N
0,50
0,79
1,23
3
=
dm
N
.
.
.
(Formula 2)
40 kN
60 kN
90 kN
0,078
0,126
0,196
0,156
0,251
0,393
0,312
0,502
0,785
0,468
0,753
1,178
3
(dm
)
G
=
mm
s
)] : 100
AZ
(see formula 1)
The volume of oil of the selected Power Unit should
be greater than 0,189 dm
2018.20.06000.060 supplies 0,251 dm
(The 2018.20.04000.110 could also be used)
(see table 3)
Calculate the used stroke of the Power Unit:
s
= ((V
: V
) s
Gerf
N
G
s
= ((0,189 : 0,251) 50) + 10 (see formula 2)
Gerf
s
= 48 mm
Gerf
In the above example, we recommend a Power Unit
2018.20.06000.060 with a used stroke of 48 mm. The
admissible Cam Unit stroke speeds defined in section
9 must not be exceeded. It should also be noted that
the Cam Units will have different stroke speeds if two
Cam Units are driven by a single Power Unit.
Step 5
Select appropriate hoses and screwed couplings. The
maximum admissible hose length between Power Unit
and the Cam Unit is 2000 mm. The nominal hose dia-
meter is determined on the basis of the size of the
Power Unit. The hose size is matched to the flow of oil
(see page 48).
Depending on the press speed a nominal hose width
smaller than the standard nominal width may be used
(see table 4).
Nominal hose size
Standard nominal
width Max. speed
Power Unit
0,8 m/s
2018.20.01500
DN 12
2018.20.04000
DN 20
2018.20.06000
DN 25
2018.20.09000
DN 25
2018.20.15000
DN 32
150 kN
Table 4: Press speed/nominal hose size
0,307
0,614
It is easiest to determine the correct hose
1,227
length if both Power Unit and Cam Unit are
1,841
installed inside the tool.
Remember to protect the hose against sharp edges
etc. The hose moves slightly during operation due to
the pulsating oil pressure.
Observe the minimum bending radius.
3.
For example, the
3
.
) + 10
G
Press speed
0,6 m/s 0,4 m/s 0,2 m/s
DN 12
DN 12
DN 20
DN 12
DN 20
DN 20
DN 25
DN 20
DN 32
DN 25
subject to alterations
DN 12
DN 12
DN 12
DN 12
DN 20
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