Research On Geometry Detection And Laser Cladding Repairability Of Failure Parts

With the rapid development of reverse engineering technology and laser cladding remanufacturing and repairing technology,laser cladding has been widely used in aerospace and petrifaction other fields as one of the key technologies of green remanufacturing technology.The extraction of damaged area of failure parts is the basis of intelligent path planning for laser cladding robot,and its research is of great significance.Because the failure forms of parts in different industrial manufacturing fields are different,the repair of the parts should be repairable according to the condition of the specific parts.The repairability evaluation is made and the repairable basis is established,the pre treatment work of the damaged part of the part and the 3D scanning extraction and geometric reconstruction of the part to be repaired are not very mature.The trajectory planning of the repaired area is a problem that needs further study.Secondly,the automatic control and controlled process of the process equipment of the cladding,according to the selection of the material of the parts and the selection of the parameters of the cladding process according to the actual situation of the parts,the method of evaluating the feasibility of the final post treatment and the result of the cladding,all of which need further solution and optimization.This paper focuses on the method of extracting damaged parts from damaged areas and the repairability of laser cladding remanufactured damaged parts.The main research work is as follows:1)On the basis of classifying damaged parts damage categories,we propose a surface shallow damage boundary feature extraction based on curvature threshold and normal vector angle threshold,and local deep layer damage area extraction based on 3D comparison and Boolean operations.Deep damaged area extraction was compared with two methods.2)The laser cladding remanufacturing repairability research method was summarized and applied.In the process of process test and remanufacturing of parts,the repairability is studied by the combination of the traditional cladding quality detection and the nondestructive examination.3)Research on mold repair of complex failure surface.In addition to the damage boundary extraction of the complex surface shallow damage mold,the trajectory planning was studied.The point cloud slice technique and the cutting triangle slice generated cladding path are compared and selected.Using the equal bow height to sparse the processing point,and then calculate the interpolation point of the cladding process.The differential geometric characteristics of the surface are analyzed by NURBS surface fitting,and the normal vector of the processing point is obtained,and then obtain the trajectory of the laser gun head.4)The single layer and multi-layer cladding process tests were studied.In order to complete the repair of damaged parts,the scanning mode of multilayer cladding and the preparation of multi-layer gradient materials are studied,and the better forming effect is obtained.On the basis of this,the repair test of the rubber extrusion shaft and damaged gear is analyzed and studied,which provides a certain reference value for the repair of actual valuable parts.