TPT November 2011

T echnology U pdate

Decoilers with two expandable mandrels

production speeds on transforming lines where they are applied. Two versions have been developed; these are identified as follows: AD 256 E can operate with strip widths maximum up to 250mm. and maximum loading capacity, as per weight, of 6,000kg per mandrel AD 368 E can operate with strip widths maximum up to 360mm and maximum loading capacity, as per weight, of 8,000kg per mandrel. The use of this kind of decoiler offers many advantages as: • Possibility to be installed at the beginning of a tube mill, both for unalloyed carbon steels and stainless steels. • Do not require specific foundation works • Fast and easy installation. The machines are complete and equipped with autonomous hydraulic power unit and control panel • Require a reduced maintenance procedure. The strip coil is picked up from warehouse and loaded on the mandrel; a radial support together with a laterally positioned roll provide a reference and containment during the strip unwinding at a high speed. The expansion movement of the section bends, controlled by a special

OTO SpA has unveiled decoilers that have an appropriate supporting structure capable of simultaneously handling two expandable mandrels that are counter positioned. Their main function is to support the coil during the unwinding phase, assuring a constant mechanical tension on the strip. The double mandrel solution is extremely convenient because it offers the possibility to put on the free mandrel a new strip coil (on loading side) while the other coil is being unwound to feed the line. This phase can be performed in full security conditions for the operator considering that the decoiler is equipped with special protection panels that efficiently separate the strip unwinding side feeding the line from the loading new coil opposite side. Their essential simplicity combined with all necessary characteristics required to accomplish at the best their mission, give to the operator the comfort to ease the machine handling and execute some simple and small regulations required, depending on the raw material utilised. These decoilers are particularly recommended to process out strips with very low thicknesses at a high

possibility of uncontrolled unwinding of the coil once the retaining bulkhead is removed. For this reason the standard version decoiler is equipped with idle pressing rolls that require the operator's action to put the head of a new coil into the strip joiner unit to join it together with the tail of the coil which is being processed in the profiling phase. As an option and on request when coils of bigger thickness are processed, instead of using idle pressure rolls (and easily interchangeable) it is possible to use motorised pressure rolls. They are driven by an electrical motor coupled with a gear reductor and are controlled by an operator, who uses a special foot pedal actuator. OTO SpA – Italy Website: www.otomills.com

From design to production, made in Italy for superior quality

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selector installed on the main switch board, assure the coil proper centring and fixing on the mandrel. On the mandrels it is also possible to install additional bends allowing the coil locking with different internal diameters. Once the loading of the coil is accom- plished, the operator (using appropriate control switches on the main control board), will make the pressure roll press on the external diameter of the coil avoiding any

New volume crimping machine up to 6” industrial hose, 3” six spirals, max Ø 220 mm

Hydraulic hose & tubing

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processing equipment

An OTO SpA decoiler

www.op-srl.it

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N ovember 2011

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