Research On Process And Path Planning Of Turbine Model Blades Additive Manufacturing Using CMT

Arc additive manufacturing technology was the method that melt metal wire to bead and completed according to the path generated in advanced or on-line.At present,literatures and related reports on arc additive manufacturing were mostly studied for process parameters,as well as mechanical properties and organization analysis,but less in ensuring the dimensional accuracy.In order to ensure the forming accuracy,the paper analyzed the characteristics of the welding bead size under different welding speed and welding current,and studied the path planning of large inclination angle wall.The algorithm of slicing and path generation based on secondary development of Solid Works is designed,as well as post process.CMT arc additive manufacturing system was built as the foundation of experiments.Process control was used to control the manufacturing of turbine blade.By the manufacturing of specific part,the stability of the system,correctness of the slicing and the path planning were verified.The Correspondence between welding current,welding speed and the width and the height of the weld bead was studied by single-layer single-channel welding at the condition of with/without preheat.The data support was provided for the high feedback of the follow-up experiment.Different three-axis path planning programs were tested and the most appropriate engine for arc additive manufacturing was found.Based on this,the welding path was used to build twisting wall and columns,the use of parallel face slices,parallel line and the way in which the torch was tilted while welding the work piece was verified.This paper systematically studied the secondary development path planning using Solid Works,designed the path planning program for the arc additive manufacturing.Deeply studied the parallel scanning algorithm of complex shape to ensure the minimum start/stop arc point,and studied the automatic tilting torch algorithm to focus on solving the problem of collapse.Post process program was designed using MATLAB.It was used to control YASKAWA robot and change the parameters as well as robot gesture.The CMT additive manufacturing system was built and used in the actual turbine blade forming process.The relevant preparing work was carried out.The path planning method was used to control collapse and guarantee forming.The welding speed and current was controlled by the analysis of welding bead that have already finished to ensure the forming accuracy.The forming process was stable and the forming results were of high dimensional accuracy.