TPT March 2007

D rilling, P iercing & P unching T echnology

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.

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 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. › Figure 2: All punched holes with cutting guides must be identical for cluster perforations of shelf systems

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

fi Figure 1: Petig’s range of tube punching machines utilise the through- punching method

› Figure 3: stamping tools are a vital benefit of Petig punching technology

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 : info@petig.com Website : www.petig.com

... Follow the leader in bulk goods handling, dust-extraction and ventilation plants

Original Quality to a Modular Design

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-

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• 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.

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Fr. Jacob Söhne GmbH & Co. Phone +49 (0)571 95580 www.jacob-pipesystems.eu

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.

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