Research On Path Planning Of Laser Cladding For Complex Curved Surface Parts

The laser cladding technology as a high-tech developed in recent years,it has the characteristics of saving energy,small deformation,high product yield,high performance can be obtained the metallurgical combination of cladding coating etc,are widely applied to repair the damaged parts,the surface strengthening treatment and the components of the direct manufacturing,etc.Because of its high degree of freedom,good fluid thermodynamics and dynamics,curved surface modeling parts are increasingly referenced by many industrial fields.With the rapid development of CAD software and professional CAM system,the modeling precision of complex surface parts is getting higher and higher.Laser cladding of curved surface parts gradually becomes the development direction of parts remanufacturing,but due to the process conditions,the complex surface quality of cladding layer is difficult to be guaranteed.In the process of remanufacturing laser cladding of surface parts,the planning of the cladding path is of vital importance,which directly affects the cladding quality of the workpiece surface.This paper combines the technology characteristics of laser cladding,the path planning of curved surface parts is carried out,and the quality of cladding layer is improved on the basis of improving the processing efficiency of curved surface parts,and the path planning simulation and experiment prove the rationality of the method.(1)Firstly,the point cloud data of the curved surface parts is obtained by the reverse engineering technique,and carries on the processing,and the point cloud data with small deviation,moderate density and clear outline of the point cloud are obtained.The feature of the point cloud is analyzed and the algorithm of the feature point field is selected.The method of fitting the local NURBS surface is used to analyze the geometric properties of the surface,and the normal vector of the feature point is obtained,which will lay the foundation for the subsequent cladding processing.(2)By using point cloud slicing technique to generate cladding processing path,and calculate the slice thickness according to the point cloud density,combined withthe characteristics of the surface of the introduction of artificial interaction means to determine the direction of cladding scanning.Analyzing the characteristic of the cladding process and the characteristic of the curved surface,the interpolation points are calculated by the method of equal arc height and sparse processing points,and then the trajectory of the laser gun head is obtained.(3)Simulation and experiment are carried out according to the obtained cladding trajectory.Because the robot has large processing freedom,and can be flexible cladding processing.Firstly,coordinate transformation and robot path generation of the cladding planned path,to get the final cladding process,and the experiment was carried out according to the procedures of cladding.Finally,the quality of the cladding layer was qualitatively and quantitatively analyzed,and the rationality of the method was verified by the experiment.