TPT September 2008

T echnology U pdate

The benefits of through-punching over single-wall punching

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  All punched holes with cutting guides for cluster perforations of shelf systems must be identical

 Petig’s range of tube punching machines utilise the through-punching method

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S eptember 2008

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