TPT March 2011

A utomotive T ube & P ipe M anufacturing

Duratrim scarfing system improves strip edge presentation

the strip. The Duratrim is capable of running up to 100m/min without cooling of the cutting tools; speeds above this may require emulsion cooling. Duratrim is simple to install and set, requires only compressed air to operate and is a low cost investment. It offers considerable benefits over other more expensive edge preparation systems and will ensure a rapid payback on investment. It can be mounted onto the mill forming bed or ‘freestanding’ between accumulator and forming station. It is easily able to withstand cross welds (coil join sections) and will even cope with damaged strip at the beginning or end of a coil. Superior Technologies Europe – UK

COMMERCIALLY slit coils can have often have as much as 35% of their edges that are not cut cleanly. This can be due to many factors such as bad practices, poor quality material and badly worn tooling. The result of this is that edge presentation at the welding point will be poor and welding heat has to be increased to ‘melt’ more material, excessive squeeze pressure also has to be applied to avoid defects. These issues will increase material and energy costs as well as creating an excessively large inside/ outside welding flash that then has to be removed. In summary a very bad situation. STE’s Duratrim is a unique edge scarfing system for welded tube mills. It enables the manufacturer to trim and clean the steel coil edges as it enters the tube mill prior to the forming station. It is particularly effective for aluminised material for automotive exhaust systems. This process helps realise significant benefits: reduced welding energy; consistent homogeneous weld integrity; reduced strip width/costs; ability to weld more challenging materials; reduced rejects; less OD/ID welding flash (bead); less ‘splatter’ from weld zone; consistent strip width leading to fewer rejects; unit runs ‘dry’ without emulsion; increases life of impedors and OD/ID scarfing tools; increased yield and correct all slitting problems. It is a simple but effective design with a unique method of shaving the strip edges. This is due to the ‘floating’ design of the

scarfing assemblies which allow the unit to follow the path of the steel strip whilst maintaining positive contact pressure on the scarfing inserts. The system utilises four sets of special scarfing inserts, which remove material from the strip edges, top and bottom. The inserts are supported and kept in position by pneumatic cylinders (eight in total), the pressure of which is adjustable enabling different amounts of material to be removed. All sets of inserts are mounted on a floating mechanism ensuring constant material removal even with movements in

Email: sales@st-europe.co.uk Website: www.st-europe.co.uk

STE’s Duratrim

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