The article presents the technology of laser cladding of metallic powders and a machine for laser microsurfacing developed for this purpose. This specifically designed and manufactured station is based on a three-axis CNC machine, equipped with appropriate laser safety systems and a dust extraction system. A disc laser is used as a source of laser energy, connected with the processing optics by a fibre optic cable. A brush powder feeder with a nozzle for shaping the flow of powder transfers the powder coaxially with the laser beam. The system is integrated with a PC-motion card which acts as a CNC controller. The article also presents the results of laser surfacing experiments, classified in terms of the following criteria: surfacing height, width and depth of penetration, wetting angle and microstructural parameters. The laser power density, powder feeding rate and density, as well as the relative movement of the welding head against the component, have been selected as independent parameters.
system laserowego mikronapawania proszków metali system for laser microcladding of metal powders Dr inż. Tomasz Baraniecki, prof. dr hab. inż. Edward Chlebus, mgr inż. Marian Dziatkiewicz, mgr inż. Jakub Kędzia, dr inż. Jacek Reiner, mgr inż. Marcin Wiercioch -Politechnika Wrocławska.
StreszczenieW artykule przedstawiono technologię laserowego napawania proszków metali oraz opracowaną dla niej obrabiarkę do laserowego mikronapawania proszków. Zaprojektowane i wykonane stanowisko bazuje na trzyosiowej obrabiarce CNC, którą wyposażono w odpowiednie układy bezpieczeństwa laserowego i pyłowe-go. Jako źródło energii laserowej wykorzystano laser dyskowy sprzężony światłowodem z optyką obróbkową. Szczotkowy podajnik proszków wraz z dyszą kształtują-cą strumień proszku zapewnia jego podawanie współ-osiowo z wiązką lasera. Układ został zintegrowany z kartą PC-motion, która pełni rolę sterownika CNC.Przedstawiono również uzyskane wyniki napawania laserowego, charakteryzując je w kryteriach: szerokości i wysokości ściegu, głębokości wtopienia, kąta zwilżania oraz parametrów mikrostrukturalnych. Jako parametry niezależne przyjęto gęstość mocy wiązki lasera, pręd-kość i gęstość podawania proszku oraz względny posuw głowica-przedmiot.
AbstractThe paper presents the technology of laser cladding of metallic powders with a machine for laser microcladding, developed in-house. The designed and constructed set-up is based on a three-axis CNC machine, equipped with appropriate laser safety and a dust extraction system. A disk laser is used as a source of energy, connected with processing optics by a fibre cable. A rotating brush powder feeder transfers the powder to a cladding nozzle, which provides the powder coaxially with the laser beam. The integration of system components is based on a PC-motion card that acts as a CNC controller.Additionally, first results of experiments carried-out on the machine are presented, with characterisation in terms of the cladding height, width and depth, the wetting angle and microstructural features. As independent processing variables the laser power density, the powder feeding rate and the processing speed were used.
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