| Laser cladding rapid prototyping is the research direction of advanced manufacturing technology. Aiming at the disadvantages of lateral wire feeding, a new process of inside-laser wire feeding at the same coordinate is put forward and a new unit of laser cladding wire feeding and especially a new type of inside-laser wire feeding nozzle at the same coordinate are designed in this article, which fundamentally change the coupling way of wire and laser by integrative design of coaxial wire feeding of wire along laser center line, coaxial wire feeding and laser head.This article establishes a distribution model of laser efficiency at the scan line width and deduces the energy distribution of ring laser beam, and also establishes two melting models: melting droplet and melting pool models by analyzing the melting procedure of coaxial wire feeding. The maximum feeding speed of inside-laser coaxial wire feeding and cladding is obtained by analyzing the relation while laser acts on wire. At the same time, discuss its influence on the quality of laser cladding by analyzing the driving force of fluid flow in the melting pool. Through monolayer line scanning cladding experiment by the new type unit o f inside-laser coaxial wire feeding, the relation between different process parameters and cladding coat quality is deduced, and the optimal process parameter is obtained and the basis for follow-up test is also provided. Based on the optimal process, multilayer parts prototyping, multi-channel overlap and directional scanning experiments are performed. Experiment results shows that inside-laser coaxial wire feeding and cladding overcomes the disadvantage of the relative bias between wire and laser position and has a excellent coupled performance of wire and laser. The surface or 3D processing for cladding wire material is probably provided. Laser scan line space on parts surface dimension precision has a important impact. The laser energy distribution is even basically if W |
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