‘Parsell’ + ‘Minni-Die’ - Manufacturers of  Press Operated & Hydraulic Punching & Notching Units

40 Trent South Industrial Park, Little Tennis St, Nottingham. Notts. NG2 4EQ. U. K.

Tel: +44(0)115 941 9009  Fax: +44(0)115 950 3921    Mob : +44(0)7860 351 648   

Tools & machines for punching steel tubes, aluminium box sections, steel box section & fabricated tubular components

updated July/28/2008

Box Section - Semi-automatic Punching

above: a view of an automatic indexing feeder to punch box section used for jack legs fitted on mobile buildings. Control is via an electrical control cabinet linked to a pneumatic logic circuit. The 70mm square pre-cut lengths of box section of 2,5 metres length, are loaded into the machine to a dead stop start at the other end of the machine.

When the machine auto button is actuated, the first pair of holes are punched through the top wall of 3,5mm mild steel thickness. The control system cycle activates the dead stop on a fixed index cycle ready for the next blow to produce the next two punched holes.

At this point the auto-indexer pilot probe engages the hole punched in the first blow and indexes the tube forward to the next position ready to punch the next two holes. The cycles continue for a fixed number of indexes until the tube emerges from the machine to its load start position - fully punched.

The tube is then rotated through 180 degrees and reloaded into the machine to repeat the blows on the opposite side of the tube. Because of the variation in the manufacturing tolerances of this type of box section/tube, it is important to make an early decision about the size of the mandrel die and holder. Plug gauges are necessary to check the tubes before punching and the ends need to be deburred.

The mandrel can also be the expanding type which is operated in sequence with the auto system to provide a ‘jack foot’  so that the tube will slide over the mandrel/die easily and then ‘expand’ to suit the walls of the inside of the tube.

above: A general view of a semi-automatic box section punching machine. The holes are at fixed centres to suit a ‘Portakabin’ jack leg used to support mobile buildings. Holes are required both sides of the 70mm square section to enable pins to slide through and log an inner leg into position.

Tubes could also be punched through both walls simultaneously using horizontally mounted punching units and a more elaborate indexing system at extra costings to the simplified system above.

above: This is a view of a special purpose machine to punch a variety of square and rectangular tubes for gate parts manufacture. Rollers can be adjusted to ‘ramp up’ the box section supports for the various sizes of box section.

This particular machine is manually indexed with a stab pin and sliding gripper via a series of flip over stops which can be adjusted for different centres.

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