Research On Path Planning Of Selective Laser Melting Based On Axis Extraction

Selective laser melting is one of the additive manufacturing technologies,its path planning is one of the key factors that affect its forming process.The processing time of different processing paths and the quality of forming are different,which directly affect the production cost,performance and precision of the parts.At present,there are many kinds of scanning methods for SLM path planning,such as parallel scanning,partition scanning,contour offset scanning,mixed scanning,and so on.Some of the parts with complex sections(such as porous irregular parts)which are processed by these common scanning methods will have corresponding quality questions(such as warp deformation,low surface precision).On the basis of the existing research,this paper applies the method of distance transformation to the problem of SLM path planning,in order to improve the quality of the forming parts.In this paper,firstly the development and application of SLM path planning and middle axis extraction at home and abroad are studied and analyzed.On this basis,a path planning method based on the middle axis extraction is proposed.This method starts from the middle axis of the two-dimensional region and fills the path formed by the biasing of the middle axis to the two-dimensional boundary.Secondly this paper expounds the calculation steps of the medial axis,searches axis points to generate medial axis of a polygon according to the distance value,and then biases the medial axis to get the initial path,and the initial path of the two dimension boundary outside is cut and the boundary of the two-dimensional region is scanned to get the final path.Then,the path planning method based on the axis extraction is realized by programming,and the path scanning dynamic simulation of simple polygons and complex polygons is realized by MATLAB.Finally,the ANSYS is used to analyze the temperature field and stress field of the improved medium path planning method andcompare with the other two methods.The results show that the warpage of the path planning method is less than the other two methods.