Research On Scan Path Planning And Control Of Metallic Powder-bed Laser Fusion

Additive manufacturing is a hot research spot nowadays due to its abilities to shorten the development time of a novel product and meet with the people's personalized requirements.Complex metallic features can be manufactured by metallic powder-bed laser fusion,which is one of the main metal additive manufacturing processes.Scanning path planning and control are important parts in the implementation of metallic powder-bed laser fusion process,the research and development of which can provide flexible and convenient space for process parameters adjustment for the forming of new materials or new structural parts.For this purpose,the research of path planning and control of the self-developed metallic powder-bed laser fusion machine is carried out.(1)Visualization of STL data model.The data structure characteristics of ASCII and BINARY format of STL file of additive manufacturing standard format is analyzed and the read,model display and interactive operation of STL format files are implemented by using the Visual C# programming language and OpenGL graphics programming interface to facilitate the user to observe the model.(2)Slice algorithm and path planning optimization.A new hierarchical algorithm based on the triangular Z-axis coordinates is presented by analyzing the current slicing algorithm of the STL model to implement the slicing data processing of the model and the commonly used path planning algorithms are implemented in this article.In addition,a scanning path optimization method is presented for splicing problem in partition scanning.(3)Laser scanning control module based on the RTC5 is developed by reference to the RTC5 working process of the control card in view of the collaborative control requirements of vibrating mirror and laser of metallic powder-bed laser fusion machine to realize the high precise and efficient control of scanning path.(4)A test of formation of a part with partition scanning is carried out based on the self-developed metallic powder-bed laser fusion machine under the process parameters of the laser power 125 W,the scanning speed 50mm/s,the powder thickness 0.08 mm and the overlap ratio 50%.The tensile strength of the specimen is increased by 4.1%,which verifies the effectiveness of the method of partition splicing path optimization.