A Study On The Equipment And Process Of Selective Laser Melting

The Selective Laser Melting (SLM), developed in the middle of 1990s, is a new type of RP manufacturing technology. Comparing with the traditional methods, the SLM process is simple, high efficiency and high utilization ratio of the material. However, the expensive price, high operation cost and low precision of SLM machine tool obstruct its more extensive application in industry.To overcome above problems, a new type of SLM machine tool, with high precision and low price, has been designed in this dissertation. The influence of process parameters on precision and surface quality of laser cladding layer has also been studied.Firstly, by analyzing the process of SLM, the conceptual design of SLM machine tool is presented in this dissertaton, and the system is integrated with high integration and low price, which contains laser system, CNC machine tool, scanner system, industrial process computer(IPC), etc. It is a novel and practical laser manufacturing system.Secondly, comparing with the advantages and disadvantages of several open architecture NC systems structures, the"NC inset PC"mode is adopted to establish the machine tool control system. A modular NC system is constructed which consists of motion control card, AC servo motors, servo drivers and encoders, etc. Meanwhile, the hardware architecture and software design of system is also discussed in the thesis.Finally, the influence of process parameters, which include laser power, scanning speed, the thickness of single layer, on surface quality of laser cladding layer is also studied in this dissertation. These studies will be a valuable reference for the further research.