TPT March 2007

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Drilling, Piercing & Punching Technology
64 March/April 2007
In order to achieve flexible, non-deformation
punching of tubes and other hollow sections
used as structural elements in shelf
construction, considerable manufacturing
expertise in punching machines and tools is
required. Based on advanced technology,
Friedrich Petig GmbH manufactures a
range of tube punching machines that use
the through-punching method.
The company believes that greater
productivity can be achieved from tube
through-punching compared to one-wall
punching. With only a slight extra outlay,
Petig claims that production speed can be
boosted by 35 per cent.
Petig’s tube punching machines can
cope with any tube – rectangular, square
or round. Applications include shelf and
storage systems, store fittings, fences,
fence systems and ladders, steel furniture
and cable ducts, railings, stairs, scaffolding,
steel structures and light metal work.
Tube through-punching involves use of a
punching die to hole the top tube wall and
perform the cutting – which is now the die
extension – to punch the lower tube wall.
The piece punched out is virtually used
as a cutter. It is important that the cutting
guide in the expansion die and die holder
is extremely tight to stop the cutting from
shifting. All punched holes with cutting
guides for cluster perforations of shelf
systems must be identical.
Punched hole quality at the
top and below is practically
the same. Depending on
material thickness, the lower
hole can be 0.2-0.3mm larger
(see figure 2).
However, this minimum
deviation from the design
dimension has no effect on
the general function.
Another benefit of this
punching technology is
the complete removal of
punched segments. Instead
of remaining within the tube,
the cuttings drop with every
punch stroke through the table into a
scrap box. This allows the square or round
tube to be automatically turned onto the
appropriate side for further processing.
Using the control system, the collet chucks
belonging to the feed measuring carriage
can be turned into any tube position.
Depending on the size, four tubes can be
simultaneously processed, while tubes of
up to 8m in length are not uncommon.
In particular, a highly advanced aspect
of these machines is the stamping tools.
Due to the large tube diameters often
encountered, it is a vital characteristic
that the machines are equipped with long
tool guides. Die lubrication with a good
punching oil also lengthens tool service life.
To rule out any cold welded layers, dies
are coated when punching is carried out on
non-ferrous metals or on stainless steel.
Petig also facilitates the rapid changing of
tools, with quick-changing tools fitted on all
punching machines.
Friedrich Petig GmbH – Germany
Fax: +49 218 173 108
Email:
Website:
• Straight welded, lipped-end pipes and components.
• ø 60 mm to ø 800 mm in a standard range.
• Larger diameters / special requirements upon request.
• Larger than ø 350 mm also available with flange connection.
• Mild steel, primer painted or hot-dip galvanised as well as
stainless steel.
• 1 - 3 mm wall thicknesses.
• Shock-explosion certified pipes and components available.
• Up to ø 400 mm normally dispatched immediately from stock.
The QUICK CONNECT® pull-ring makes the acclaimed
Jacob modular pipe system even more economical
for installation. In new plants for animal feed,
pharmaceuticals, chemicals, food, glass,
semiconductors or environmental techno-
logy as well as for upgrading existing
layouts user-friendly system installation
becomes precise and easy due to the
great versatility of mass-produced
pipe components.
... Follow the leader in bulk goods handling, dust-extraction and ventilation plants
Fr. Jacob Söhne GmbH & Co.
Phone +49 (0)571 95580
Original Quality to a Modular Design Visit us at
POWTECH!
hall 9,
booth 555
EUROPE’S NO. 1 IN MODULAR PIPEWORK SYSTEMS – Used in all industrial sectors
The benefits of through-punching
over single-wall punching
fi Figure 1: Petig’s range of tube punching machines utilise the through-
punching method
› Figure 2: All punched holes with cutting guides
must be identical for cluster perforations of shelf
systems
› Figure 3: stamping tools are a vital benefit of
Petig punching technology