TPT September 2008

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September 2008 64
Technology Update
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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 speeds 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 the
punching die to hole the top tube wall and
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 bottom 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
of the feed measuring carriage can be
turned into any tube position. Depending on
the size, four tubes can be simultaneously
The benefits of through-punching
over single-wall punching
 Petig’s range of tube punching machines utilise
the through-punching method
 All punched holes with cutting guides for cluster
perforations of shelf systems must be identical