TPT July 2008

H eat & S urface T reatments

be preset using the parameter recording facility to ensure consistent coating quality. The hydrogen start-up ensures a smooth lighting sequence, reducing the loading on the pistol, while the use of kerosene in place of hydrogen fuel makes the system more economical. With the Metallisation HVOF spray system, liquid fuel and oxygen are fed via a pre- mixing system, at high pressure, into a combustion chamber. Here they burn to produce a hot, high-pressure gas stream, which heats and accelerates the powder particles inside a secondary nozzle so that they impact with tremendous kinetic energy upon the substrate material. The Met-Jet 4L does not melt the powders, it just softens them, resulting in minimal oxidation and decomposition. The new pistol has an optimised, single point fuel injection system to promote a complete, clean burn within the combustion chamber. Two nozzle lengths are available, 100mm and 200mm, to enable a wide range of coating properties to be achieved, from hard but ductile coatings, to extremely hard but more brittle coatings. The simple nozzle design will also reduce consumable

spares costs, which in turn ensures simple maintenance, and reduced downtime for the operator. The control system consists of a PC with a touchscreen operator interface and a gas box. The individual operations of the system are controlled by PLCs in the gas box and powder feeder. The PC and PLCs are linked by serial bus to minimise wiring and increase reliability. The control system can accept signals from the booth door, the extraction system, robot and gas detectors to fully link and automate the system. It also provides the interface between the gas box, powder feeders and robot by serial bus interface. Up to 255 items can be interfaced, allowing multiple powder feeders to be linked. The system can be interfaced via USB to an external source, such as a barcode reader, an interlocked signal to production automation or a manual component selection switch box.

controlled carrier gas and closed loop motor control for reliability and repeatability of powder feed rates. The key benefits to the operator include improved repeatability of the coating, ease of use, and unlimited ‘recipes’, which can  Metallisation’s Met-Jet 4L liquid fuel HVOF system

Metallisation Ltd – UK Fax : +44 1384 237196

Email : sales@metallisation.com Website : www.metallisation.com

Chemical pickling and passivation Electropolishing (tubes up to 18 m length or u-bended, tube fittings) Clean room treatment

Derouging and repassivation Plant refurbishment on site (also vessels/tanks) Technical consultation Chemicals

www.henkel-epol.com

Materials and range of application Stainless Steel (also Duplex), Nickel and Nickel Alloys, Aluminium and Aluminium Alloys, Copper Alloys, Niobium, Titanium, Zirconium, as well as Special Alloys such as Nitinol, Hastelloy , Alloy 59, etc. Pharmaceutical, Biotechnical, Chemical, Semiconductor, Aerospace, Food and Beverage Industries as well as Medical, Heat and Refrigeration Engineering. £

Locations : Austria/Waidhofen (Thaya) - Germany/Neustadt-Glewe - Hungary/Györzamoly info@henkel-epol.com

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J uly 2008

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