FOLDED BELLOWs - Hennig GmbH

Folded Bellows

2
Individually adapted protection–
all bellows are made to suit customers’
Perfect protection for man and machine. Hennig has designed and manufactured folded bellows for machine tools for
more than 50 years. Our range includes simple dust protection, handling bellows, sophisticated designs featuring
extension systems and/or lamellas, as well as special designs for laser machines. Our customers include
nearly all renowned machine manufacturers. To maintain our high quality standards, all materials
used are permanently checked and developed by our own R & D. Hennig offers excellent
productivity and security for your machine.
Advantages of Hennig bellows:
• Maximum functional reliability
• Tailor-made solutions
• Maximum durability
• Proven components
• Minimum service requirements
• Long-term supply of spare parts
3

equirements
4
1
5
6
7
1
2
3
Extension control systems
(scissors, half-scissors, fold
tapes)
Roller
End frame
2
4
5
6
7
1
Intermediate frame
Guide frame
Glider
Coupling rail
3

4
Folded Bellows
High-frequency welded –
remains tight for a long time
Robust with a seam –
a sound matter
Neatly glued –
can be adapted to any shape
The optimum design for bellows is the high-frequency welded version.
Thanks to this process developed and patented by Hennig, the
cover material and guide frames made from PVC are permanently
joined. The homogeneous connection of the bellows material and
the guide frames ensures maximum loading capacity and absolute
tightness against liquids such as cooling or grinding agents.
For special requirements, e.g. resistance to temperatures of up to
400 °C, stitched bellows can be used. High-frequency welded bellows
can be manufactured in widths of up to 3 metres.
We make bellows with round, oval or rectangular (with rounded off
corners) cross-sections using a special sewing method. Bordering
bands, ring fasteners or support rings will be used to meet special
requirements and applications. Due to their robust design, these
bellows have a reliable long service life, even under extreme mechanical
and dynamic strain. The temperature resistance of these bellows
can be increased to approx. 400 °C when using an aluminized glass
fibre fabric.
These bellows consist of up to three foils glued together in sandwich
construction. Special shapes such as polygonal bellows, bellows
with negative folding in the opposite direction, or bellows with
small fold widths, can be easily constructed. Due to the special gluing
of materials, these bellows provide maximum protection, even
against liquids.

Fixed steel lamellas –
a solid solution
Movable steel lamellas –
if space is reduced
The perfect combination –
to give perfect protection
Hennig has developed lamella bellows to meet particularly
high requirements.
This type fills the gap between telescopic steel covers and
conventional bellows. The lamella bellows are based on our
high-frequency welded bellows. Each fold has its own guide
frame which is HF-welded to the cover material.
Lamellas made from stainless steel protect the bellows
against red hot, sharp-edged swarf, or mechanical strain.
Do you need vertically mounted bellows? Without lamella
overhang? In such a case our bellows with movable lamellas
are the perfect solution for you.
Each lamella is flexibly fixed to the guide frame. Therefore,
the lamellas can lie down flat on the machine enclosure at
the bottom.
These folded bellows featuring lamellas on three sides combine
the advantages of telescopic steel covers and folded bellows.
They are based on high-frequency welded bellows. Additionally,
we have added a lamella in the shape of a telescopic element
in each fold.
Due to this combination of folded bellows and telescopic steel
cover, these bellows are also protected on either side, especially
against red hot, sharp-edged swarf or mechanical strain.
Thanks to an ideal ratio between the extended and the compressed
length and extremely compact dimensions – the
lamella overhang equals zero – this type of bellows is perfectly
suitable when space is limited.
5

6
Smooth running properties
The dynamic properties of modern drives make heavy
demands on all bellows. Hennig customers can choose
between various design solutions.
Hence, you can adapt every detail of the friction, exten-
sion and durability properties of your bellows to your
requirements.
Rollers
Rollers are used in large and heavy bellows with
extension limits. They minimize friction and ensure
excellent running properties.
Scissors
Scissors are used for high traversing speeds. This
allows an even extension of all elements across the
whole extension length. As a result, the folds are less
strained and the durability of the bellows is prolonged.
Half-Scissors
The advantage of half-scissors is that the individual
elements can be extended successively depending on
the necessary extension length. Since the folds are
not loaded up to the theoretically possible extension
limit, the durability is also longer.

Excellent guiding properties
Generally, Hennig bellows consist of a bellows cover,
guide and end frames. Bellows with large extension
lengths are composed of various elements which are
connected by intermediate frames.
Regarding the choice of material for frames and bellows,
we can meet nearly all customer requirements.
Guide frames
The guide frames provide the bellows with the necessary
stability and enable a precise operation, even at
high speeds. They are made from PVC and are directly
welded to the cover. The shape of the frames is
adapted by Hennig to the design required.
Intermediate frames
Intermediate steel frames are used to connect the
various elements, especially when extension limit
systems are required. The intermediate frames are
fastened to the bellows with a clamping rail. The
intermediate frames can be guided by either plastic
or brass rollers or gliders.
End frames
End frames, mostly made from steel or aluminium,
connect the bellows with the machine. Hennig offers
various fastening solutions for the adaptation to
different bellows and machine interfaces.
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Manufacturing competence
The durability of Hennig folded bellows is not accidental. Meticulous
production with modern joining methods and strict quality tests on
our own test bench make sure that all bellows leaving our plant have
the highest possible quality.
High-frequency welding
High-speed test bench
The high-frequency welding system
developed and patented for bellows
by Hennig provides a homogeneous
connection of bellows covers and
guide frames.
This method can also be used
without any problem for the manufacture
of up to 3 m high apron
covers.
As a manufacturer of high-quality
machine protective systems,
Hennig has its own high-speed
test bench. Accelerations of up to
4 g and speeds of up to 800 m/min
can be tested. To simulate longterm
use, we test our bellows up
to the limits of physical loading.

Limitless – hennig folded bellows
There is nearly no limit to the use of Hennig folded bellows.
Our range of products provides an ideal solution for each
application.
We will assist you with pleasure in solving complicated tasks.
We are in fact experts for tailor-made solutions!
Horizontal cross-beam
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Materials
The covers of HENNIG folded bellows are exclusively
made from high-quality plastic fabrics and foils.
We select the cover material and processing
according to the design ambient conditions.
Decisive factors are the mechanical and thermal
strain of the bellows as well as the type of swarf
and aggressivity of the agents used. Exact details
of the used materials may be gathered from the
table of materials.
Specification Coating Carrier Thick- Colour Type of bellows Resistant to
number ext. int. ness wear
(mm)
SP 122 PUR PUR Polyester 0.35 black x x x ++
SP 268 PUR PUR Polyester 0.22 black x x x 0
SP 201 PUR PUR Nomex ® 0.35 black x x x 0
SP 205 PVC PVC Polyester 0.23 black x x 0
SP 206 PVC PVC Polyester 0.36 black x x +
SP 127 PVC PVC Polyester 0.32 black x x +
SP 208 ALU Glass fibre 0.35 silver x x +
SP 106 PUR PUR Polyester 0.90 black/grey x ++
SP 107 PUR PUR Polyester 1.00 black/grey x ++
SP 109 Viton ® PUR Polyester 0.95 black/grey x ++
SP 258 PVC PVC Polyester 0.40 black x +
SP 259 PVC PVC Polyester 0.27 black x +
SP 260 PVC PVC Polyester 0.23 black x +
SP 270 PTFE PUR Polyester 0.30 black x x x x x ++
– unsuitable, 0 suitable, + good, ++ very good
HFwelded
stitched
Lamellabellows
roundstitched
glued
special shapes

Table of Materials
Most commonly used materials:
POLYURETHAN (PUR): Temperature resistance up to 120°C
Dickson-PTL: Aluminium-coated satin-glass fabric
(Producer) Temperature resistance up to 400°C
(only for stitched version)
NOMEX ®
: Flame-resistant material,
suitable for laser applications
POLYVINYLCHLORID Material does not continue burning
(PVC): after energy application
(self-extinguishing)
TEFLON ®
- Anti-adhesive, high-chemical and
POLYTETRAFLUOR- thermal resilience, dirt-/water-repelling,
ETHYLEN (PTFE): corrosion-proof
Resistant against Surface Resistant against Self- Flame- Ratio between Note
oil, greases and stability swarf, extinguishing resistant extension and
coolants welding splatter compression
forging scales
++ ++ + +
0 ++ 0 ++
– + ++ x + Flame-resistant, radiant heat up to
200 °C, US Standard UL94HB
– 0 – – ++
0 + 0 +
– 0 0 x + Self-extinguishing, behaviour in fire
corresponding to DIN 4102B2
0 + ++ +
++ ++ + 0
++ ++ + 0
+ ++ ++ 0 Contact temperature 400 °C
0 + 0 0
0 + 0 0
0 + 0 0
++ ++ ++ + +
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Shapes: apron covers/folded bellows
Apron cover Folded bellow
Lmin.
ae
Fastening proposals
AZ
Stroke Hub
Lmax.
Stroke
Hub
Lmax.
End frame (standard)
• Steel, aluminium or PVC
• Screwed onto the machine from
inside or outside the bellows
• Shape, bore holes or screw threads as per
customer drawing
End frame (protruding)
• Steel, aluminium or PVC
• Bellows screwed onto the machine from
inside the bellows
• Shape and bore holes as per customer
drawing
End frame (protruding)
• Steel
• Bellows fastened from inside with
an auxiliary frame
• Shape and bore threads as per customer
drawing
End frame (Velcro fastening)
• Velcro band fastened with self-adhesive tape
Special fixing devices and combinations are possible upon customers’ request.
c
AZ
B
a
Lmin.
e
e
cl

Shapes: apron covers/folded bellows
with lamellas (fixed)
Apron cover Folded bellow
Guides Führungen
müssen
must durchgehend be
continuous sein
PVC PVC-Führungsrahmen
Guide frame
AZ
Lmin. Hub Stroke
Lmax.
g
g1
a
e
e
2 – 3
2 Clearance – 3
umlaufend all around
4,2
Fold height Extension per fold (AZ) Width of
(e) Apron cover Bellow lamellas (K)
24 27 33 61
30 39 45 76
35 49 55 81
40 59 65 91
45 69 75 101
All dimensions in mm
End frame (standard):
• Steel, aluminium or PVC
• Screwed onto the machine from inside
or outside
• Shape, bore holes or threads as per
customer drawing
End frame (protruding):
• Steel
• Screwed onto the machine from inside with
an auxiliary frame
• Shape and bore holes as per customer
drawing
End frame:
• Steel, aluminium or PVC
• Screwed onto the machine from inside
• Shape, bore holes or threads as per
customer drawing.
Special fixing devices and combinations are possible up on customers’ requests.
K
c
e
AZ
Stroke Hub
Lmin.
Lmax.
g
B
a
e
e
4,2
K
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Shapes: apron covers/folded bellows
with lamellas (movable)
Apron cover Folded bellow
Guides Führungen
müssen
must durchgehend be
continuous sein
Fastening proposals
g
g1
PVC PVC-Führungsrahmen
Guide frame
a
AZ
Lmin. Stroke Hub
Lmax.
e
2 – 3
2 Clearance – 3
umlaufend all around
K
e
Fold Extension per Fold(AZ) Width of
height (e) Apron cover Bellow Lamellas(K)
24 30 36 67
30 42 48 82
35 52 58 87
40 62 68 97
45 72 72 107
4,2
AZ
Stroke Hub
Lmin.
Lmax.
All Dimensions in mm
End frame (standard):
• Steel, aluminium or PVC
• Screwed onto the machine from inside
or outside
• Shape, bore holes or threads as per
customer drawing
End frame (protruding):
• Only suitable for movable lamellas
• Steel, aluminium or PVC
• Screwed onto the machine from inside
• Shape, bore holes as per customer drawing
End frame:
• Steel, aluminium or PVC
• Screwed onto the machine from inside
• Shape, bore holes or threads as per
customer drawing
Special fixing devices and combinations are possible on customers’ requests.
c
e
g
B
a
K
e
e
4,2

Shapes: round stitched bellows
special glued shapes
Ø G
Ø G
Fastening proposals
Ø d
e
Ø D
a
Collar (Type 1/Type 2):
Different fixing devices are possible on
either side.
Manschette Collar Support Stützring ring Endring End ring
Manschette Collar
Lmin.
Lmin.
Lmax.
AZ
Hub Stroke
Stützrahmen Support frame Endrahmen End frame
AZ
Stroke
Hub
Lmax.
Flange:
Different fixing devices are possible on
either side.
Special fixing devices and combinations are possible up on customers’ request.
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Inquiry form for folded bellows
Please copy, fill in and send to Hennig GmbH Fax No. +49 89 96096-120
Company (complete address)
Technical Data
1. Required stroke
2. Compressed length
3. Extended length
4. Fold height
5. Length of lamellas
6. Width of bellows
7. Inner diameter of bellows
8. Outside diameter of bellows
9. Lower wrap-around
10. Travel speed
11. Acceleration
12. Width of slideway
13. Left-hand lateral height (outside)
14. Right-hand lateral height (outside)
15. Height of bellows above support
16. Type of machine
17. Axis
18. Number of strokes per day
19. Coolant**, lubricants
20. Type of swarf
21. Ambient temperature
22. Linear type of slideway
c 1
a
a
d
H =
Lmin =
Lmax =
e =
g =
a =
d =
D =
* see corresponding page in brochure ** no vegetable oils
e
c 2
I =
v =
a =
B =
c1 =
c2 =
h =
Date
Contact
E-Mail
Phone/Facsimile
mm
mm
mm
mm
mm
mm
mm
mm
mm
m/min
m/s 2
mm
X Y Z
3
Material of end frames
Steel Stainless steel
5 Mode of operation
Horizontal Vertical
Cross-beam Other
6 Conditions of application
8
PVC Aluminium
4 Type of fixing*
Standard Protruding
Velcro fastening Protruding
Swarf Rust
Coolant** Temperature
Dust
7 Standard shape*
9
Order quantity
Sparks
Drawings, sketch, photo or notes
Flange
Collar
Wood
Oil

A company of the GOELLNER Group Rockford Il./USA
Hennig GmbH Postfach/PO Box 1343
Überrheinerstr. 5
85543 Kirchheim
85551 Kirchheim
Germany
Germany
Tel./Phone +49 89 960 96-0 info@hennig-gmbh.de
Fax +49 89 960 96-120 www.hennig-gmbh.de
All members of
the Hennig group are
DIN ISO 9001:2000 certified.
www.hennigworldwide.com FTB0509/E