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voith.com
Hydraulic servo stroke control
units for punching, shearing and
cutting machines
Product data sheet
Advantages
+ Highly dynamic drive
+ Controlled movement profiles
+ Optimal power density
+ High availability
+ Easy installation and commissioning
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Design and function
Voith servo stroke control units are modular, highly dynamic
hydraulic control units. They consist of a hydraulic actuator
with a directly flange-mounted control block with all functions,
as an option, an application-optimized hydraulic power pack
with efficient and robust internal gear pumps and an electron
ic control system. The attachment of all necessary valve components directly to the block cylinder offers a compact design
and optimum power density, very high hydraulic stiffness of
the actuator with low installation effort. The actuator is con
trolled by a servo control valve in a hydromechanical control
loop. The stroke length and stroke position are controlled by
the hydromechanical control loop of the hydraulic amplifier
and hydraulically amplified in a highly dynamic manner by the
servo valve. In the BWSE drive, the stroke length and stroke
position of the cylinder are set mechanically at the control
valve. The stroke is triggered by an electrically controlled, fastswitching pilot valve. The hydromechanical control eliminates
the need for measuring systems and electronic control concepts. This is the basis for system-typical properties such as
dynamics, robustness and process reliability. Cylinder design,
surface adaptation and installation conditions are directly
adapted to the specific requirement profile of the applications.
Energy balance graphic
Theoretical energy demand during punch operation
Stroke
EnergyEnergyEnergy
Metal
sheet
Time
One pressure system energy demand during punch operation
Stroke
Metal
sheet
Voith servo stroke control units offer highly dynamic motion
sequences. The expected high performance, force and dy
namics are optimally fulfilled with the offered drives. Voith
servo stroke control units are very energy efficient and require
a low installed electrical power. This is due to the load-controlled, two-pressure system and the accumulator operation.
The Voith electronic controls are the electronic link between
the punch drives and the machine control system. Via the
electronic controls, parameters such as speed, position and
travel profile are output to a stepper motor with low electrical
power. After cycle start, all hydraulic sensors and actuators
are managed by the electronic control.
-
Time
Two pressure system energy demand during punch operation
Stroke
Metal
sheet
Time
Theoretical energy requirement
Additional energy requirement of an one pressure
system to the theoretical energy requirement
Additional energy requirement of a two pressure
system to the theoretical energy requirement
Saved energy
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Table of contents
Hydraulic punch drive BWSE NG 10
Features, scope of delivery, applications, options 4
Technical data, examples of applications 4
Diagram 5
Basic dimensional drawing 6
Type code 7
Electrohydraulic power rod
Features, applications, options 8
Technical data 8
Diagram 9
Basic dimensional drawing 10
Type code 11
Servo drive BWIL
Features, applications, options, Scope of delivery 12
Technical data, force/cylinder dimensions 12
Diagram, principle of operation 13
Basic dimensional drawing BWIL 25 14
Basic dimensional drawing BWIL 32 15
Basic dimensional drawing BWIL 40 16
Type code 17
3
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Hydraulic punch drive BWSE NG 10
Features
•
The stroke position (TDC) is independently adjustable
•
The stroke length is mechanically adjustable to meet the
machine demands
•
The piston acceleration and deceleration is smooth and
controlled
•
The target speed is independent of load and reproducible
•
The load variations on the cylinder are compensated
steadily
•
Very dynamic performance, even for high load forces and
large mass load
•
Any ram positioning is with closed loop compensation, no
hard stops being used
•
Positioning is fast, yet smooth
•
High process safety, increased availability and dynamics
•
Proximity switches E1 and E2 for stroke management are
integrated
•
The integrated electronic pulse generator offers easy
stroke management
•
Reduction in pressure peaks through continuous control
and thus relieves the sealing elements
•
Energy savings through accurate and user-friendly
adaptation of the working stroke
Scope of delivery
•
Hydraulic cylinder, optimized for punching and shearing
applications
•
Control valve with integrated proximity switches
•
Electronic pulse generator for valve control
Technical data
General
Ram force 10 to 400 kN
(standard design)
Retraction force approx. 50% ram force
Ambient temperature -5 to +50 °C
Mounting position any
Hydraulic
Operating pressure max. 210 bar
Fluid temperature -10 to +70 °C
2
Viscosity range 10 to 300 mm
/s
Electric
Control Electronic pulse generator
Data sheet 914
Examples of applications
Application Specific performance
Pre-punching plant
Trash hacker in press plant
characteristics
•
Punching force: 150 kN
•
Total cycle time
at 10 mm stroke: 235 ms
•
Cutting force: 60 kN
•
Total cycle time
at 6 mm stroke: 75 ms
Hydraulic punch drive BWSE NG 10
Applications
•
Pre-punching plant/line punching plant
•
Trash hacker
•
Ejector
•
Machines and plants for stamping
Options
•
Linear actuator with control valve for three-way operation
suitable for systems with large moving foreign masses
•
Non-standard stroke lengths
•
Valve for holding the cylinder in top position
4
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Diagram
E2
E2
B
A P
Stroke
length
Stroke position
T
B
G 1/4
G 3/4
G 3/4
OT
Y
T
P
Y
AP
BT
Stroke [mm]
Start signal
(min. 50 ms)
Solenoid Y
Proximity switch E1
Proximity switch E2
Signal to control
(cylinder ready)
UT
0
24V
0
Hi
Low
Hi
Low
t [ms]
5
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Basic dimensional drawing
Force F
[kN] Ø D Ø d A B C F J K M SW g2
max
20 40 28 100 75 144 55 44 30 M20x1.5 22 M10
35 50 35 108 90 143 65 55 35 M27x2 27 M12
55 63 45 130 105 192 70 62 42 M30x2 36 M16
90 80 56 145 125 220 90 75 50 M42x2 46 M16
140 100 70 190 150 280 110 90 60 M48x2 60 M20
Other cylinder dimensions on request
All dimensions in mm
depends on the configured operating pressure
F
max
21 T G3/4 P G3/4 L G1/4
1919
3
d
Ø D f7
SW
3
M
K
4210
A + strokeJ
71
231C + stroke
E2 E1
6
Stroke: 5 – 30 mm
25 – 50 mm
Stroke position adjustment:
Stroke: 5 – 30 mm
25 – 50 mm
14
M8
(both sides for transport)
10 mm
Stroke: 5 – 30 mm
25 – 50 mm
Stroke position adjustment:
10 mm
g2
144.2
Ø F
Ø B
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Type code
S61 E ------
040100700 25/50BWSEaaaaaaa 70051510 VW //
Fastening type of cylinder
R = Back with groove
S = front
T = R+S
Cylinder stroke (max.)
Diameter mechanical
feedback
Rod diameter
Piston diameter
Support unit, holding pressure
00 = without
05 = 5 bar
10 = 10 bar
Proximity switch
I = internal
E = external
Electronic pulse generator
1 = with
0 = without
Stroke length adjustment
(from / to)
Stroke position
Adjustment range (max.)
Design code
Control design
DW = 3-way operation
VW = 4-way operation
Nominal size
Punch drive BWSE
Material number
7
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Electrohydraulic power rod
Features
•
Programmable speed, position and tool feed profiles
•
Hydromechanical closed loop
•
Direction-sensing overload display
•
Smooth rod movement
•
No measuring systems are required
Technical data
General
Stroke length 70 / 150 m m
Return force approx. 10% to 20% rod force
Programmable step size 0.1-0.004 mm
Applications
•
Bending
•
Cutting
•
Stamping
•
Shearing
•
Blanking
Options
•
Integrated stepper motor driver
•
BDC/TDC position unit to reduce cycle times
•
Electronic control of stepper motor, improved performance
•
Design modifications for special safety requirements
Max. rod speed 500 mm /s
Ambient temperature -5 to +50 °C
Mounting position any
Hydraulic
Operating pressure max. 250 bar
Oil temperature -10 to +70 °C
Viscosity range 10 to 300 mm
Electric
Control 2-phase amplifier
digital / analog
Electrohydraulic power rod Servo-mechanical fineblanking press
2
/s
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Diagram
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Basic dimensional drawing
Ø Piston Ø Rod L+stroke* A B / C Ø f h m n
40 36 110 76 56 50 M16x1.5 M10 18
50 45 110 76 56 65 M20x1.5 M12 20
63 56 120 100 80 70 M24x1.5 M12 25
80 70 125 130 100 90 M24x1.5 M16 25
100 90 170 160 120 110 M42x1.5 M16 30
110 100 170 170 130 120 M42x1.5 M16 35
120 105 175 180 140 140 M48x1.5 M24 35
140 125 205 200 140 140 M48x1.5 M24 40
160 140 210 240 190 170 M64x1.5 M30 40
electric connection plug not included
*measurements given are minimum
**measure K on request
All dimensions in mm
10
268
3
h
f
n L + Stroke 108
K**
P
T
L
C
m
72
h
B
A
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Type code
NA1 --
070050268SBKSVPA U040aaaaaaa 45A005 /
Cylinder code
N = VTHL
S = special design
Max. cylinder stroke
Diameter rod
Diameter piston
Hydraulic fall protection
A = A
B = B
C = A+B
/ = without
Diameter pinion
Thread A
Electric diagram
Stepper motor
Size power rod
Size valve
Power rod
Material number
11
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Servo drive BWIL
Features
•
Hydromechanic closed loop
•
High dynamic even with high forces and external masses
•
Programmable start position, working stroke, speed and
other free choosable parameters
•
Process safety by monitored cycle sequence
•
Robust valve technology
•
High availability
Applications
•
Drive for positioning (active downholder for presses)
•
Combination drive for punching, shearing and stamping
•
Servo drive for forming machines
Options
•
Demand-driven high/low pressure switching
•
Safety modules (e.g., Performance Level d)
•
Power pack
•
Special designs
•
Customer’s setpoint control
Scope of delivery
•
Servo drive BWIL
– Optimized hydraulic cylinder
– Control valve
– High retention valve, in accordance with specific
requirements
– Accumulator
– Voith servo motor
•
Electronic control HS4-SV1
– Intelligent drive control and diagnosis
– Data interface: RS-232, CAN Bus, Profibus, Ethernet, USB
•
Linear position measuring system (incremental or absolute)
•
Cable kit for servo motor
Servo drive BWIL
Technical data
General
Ram force 200 to 2 000 kN
(standard design)
Return force 10% to 20% of ram force
Ambient temperature -5 to +50 °C
Mounting position mountable in any position
Hydraulic
Operating pressure max. 250 bar
Flow rate BWIL 25 max. 350 l/min
Flow rate BWIL 32
Flow rate BWIL 40
max. 750 l/min
max. 1.500 l/min
Fluid temperature -10 to +70 °C
2
Viscosity range 10 to 300 mm
/s
Electric
Control HS4, data sheet 915
Force/cylinder dimensions
Force*
[kN]
210 120 110
300 140 130
400 160 150
480 180 165
600 200 185
74 0 220 205
850 240 220
1 020 260 240
1 19 0 280 260
1 390 300 280
1 590 320 300
1 820 340 320
1 960 360 335
2 2 10 380 355
2 470 400 375
2 680 420 390
Piston diameter ØD
[mm]
Rod diameter Ød
[mm]
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Diagram
1.4
Servo motor
1.3
L
1.1
b
0
1.0
T
P
a
B
1.2
A
T1
T2
P1
P2
Additional mass
Principle of operation
The servo motor 1.4 specifies the setpoint via a toothed belt
drive 1.3 to the control valve 1.1 on. In the valve, the rotational
movement is converted into linear motion and is amplified by
the hydraulic cylinder many times 1.0. The actual position of
the working piston is guided directly on these back through
1.5
the mechanical connection between the hydraulic cylinder and
control valve. Thus, the hydro-mechanical control loop is
closed. When switched, the attached high holding valve 1.2
will keep the cylinder, and the mass attached to it, in the
starting position.
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Basic dimensional drawing BWIL 25
View X
350
Ø K
Ø M
Fastening holes
X
844
240
Ø d
Ø D
Ø Z
405
T
P
L
Stroke
Example
BWIL 25 with cylinder diameter 180/170/16 – 60 mm stroke.
The dimensions given are to be considered as guidelines.
Dimensions and port sizes are defined project-specific basis. All dimensions in mm
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Basic dimensional drawing BWIL 32
T
L
P
Ø K
Ø M
View X
400
Fastening holes
452
X
T
P
868
L
235
Stroke
Ø d
Ø D
Ø Z
Example
BWIL 32 with cylinder diameter 180/160/32 – 25mm stroke.
The dimensions given are to be considered as guidelines.
Dimensions and port sizes are defined project-specific basis. All dimensions in mm
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Basic dimensional drawing BWIL 40
Ø K
Ø M
X
T
1 238
Fastening holes
View X
529
495
L
P
T
P
374
Ø d
Ø D
Ø Z
Example
BWIL 40 with cylinder diameter 240/220/60 – 50mm stroke.
The dimensions given are to be considered as guidelines.
Dimensions and port sizes are defined project-specific basis.
Stroke
All dimensions in mm
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Type code
SRACDW 0 ----
080180200700BWILaaaaaaa 320525 //
Cylinder
R = backside with groove
S = front side
T = R+S; X = special design
Cylinder stroke
Feedback diameter
Rod diameter
Piston diameter
Support unit holding pressure
00 = without support unit /
annular space protection;
05 = 5 bar
10 = 10 bar
RA = with annular space protection
HY = application-specific support unit
Safety switch
I = internal
0 = whithout
Arrangement of the motor
R = belt drive
K = coaxial
Set point motor
AC = servo motor
SM = stepper motor
Design
Control
DW = 3-direction operation
HS = High pressure switch
lagdepending
HD = High pressure switch
pressuredependent
Size
Servo drive
Material number
17
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This is a translated document
Original language: German
Legally binding language version of the document: German
10803-SERVOSCU-PDS-EN-221116, BDI, VT2565. All data and information without obligation. Subject to change.
Voith Group
St. Poeltener Str. 43
89522 Heidenheim
Germany
www.voith.com/hydraulics
Contact:
Phone +49 7152 992 3
sales-rut@voith.com
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