Research On Model Reconstruction And 3D Printing Repair Of Damaged Parts

With the increasingly serious problems of resource crisis and environmental pollution,the concept of carbon peaking and carbon neutrality has become the focus of attention.Remanufacturing,as the main measure of solid waste recycling and treatment,is the key to achieving carbon neutrality in the manufacturing field.In recent years,the scale of my country’s waste mechanical and electrical products has been continuously expanding,which has brought a significant impact on resources and the environment.Remanufacturing restores the original geometric shapes and physical properties of used parts by repairing them.This not only reduces the economic losses caused by replacement parts,but also reduces the waste of raw materials and improves resource utilization.This paper takes the fractured titanium alloy hollow blade as the research object,and studies the method of remanufacturing and repairing waste parts.Firstly,the related content of point cloud acquisition and preprocessing are studied.Based on the appearance characteristics of the blade,3D laser scanner is selected to collect the point cloud data of the blade surface;Combined with the different arrangement of point clouds,the current orderly point cloud filtering methods are compared and analyzed;aiming at the problems of dislocation and offset between the point clouds caused by the inconsistency of the measurement coordinate system,the point cloud coarse registration and fine registration methods are studied;Due to the large amount of calculation of traditional ICP algorithm,an improved ICP algorithm is proposed to improve the registration accuracy and efficiency.Secondly,the process of reverse calculation of blade fracture location model based on point cloud model is studied.NURBS curve fitting method is used to fit the point cloud of the broken blade section to get the fitting curve of the blade section,and the complete model of the blade is obtained through section lofting;Geomagic Studio software is used to reconstruct the point cloud of the broken blade to get the surface model of the broken blade;Boolean operation is used to get the model of the broken part of the blade.Finally,a simulation experiment for repairing broken blades by laser 3D forming is established.Establish a finite element model of the broken blade,determine the relevant experimental parameters,conduct simulation repair experiments on the broken blade,and study the temperature evolution characteristics of the nodes on the repair layer;use multiple simulation experiments with different process parameters to study the process parameters for the repair process The influence of temperature field,temperature gradient and the evolution law of molten pool geometry.This paper studies the method and process of remanufacturing and repairing broken blades,which provides a reference for the repair and remanufacturing of related damaged parts.