Research On Adjusting Pressure Cladding Nozzle Technology And Powder Flow Simulation

With the rapid development of modern manufacturing industry,there is a higher pursuit for the accuracy,performance and individualization of processing products.Therefore,metal materials manufacturing technology plays an increasingly important role in modern manufacturing industry.As a key component of metal augmenting equipment,cladding nozzle has a direct impact on the forming quality of processed products.Therefore,in order to ensure a good convergence and cladding effect of metal powder flow during processing,this paper studies the technology of adjusting pressure cladding nozzle,simulates and analyzes the state of powder flow,and uses data fitting method to ensure the authenticity and reliability of the simulation results.The main research contents are as follows:In order to achieve a better "optical-powder coupling" effect,this paper uses optical-external coaxial powder feeding scheme to design a regulated pressurized cladding nozzle,which can make the powder flow converge in a small range by regulating the pressure angle,and designs inner and outer ring powder feeding channels which can work together.Through calculation,the optimum powder feeding angle is selected.After the powder feeding angle is determined,a suitable laser generator is selected according to the requirements of metal cladding.In view of the large amount of heat generated by laser during powder flow cladding,the optimum heat-resistant material is selected and a ring water-cooling channel is designed,and the cooling effect of water-cooling channel is verified by heat flow simulation analysis.In order to study the effect of adjusting the powder flow convergence of the pressurized cladding nozzle in the processing process,considering the gap between the metal particles,the gas-solid two-phase flow model is used for simulation analysis,the Fluent module in the ANSYS Workbench is used to calculate the movement of air and powder particles in the powder feeding channel,analyze the convergence of the powder end flow when the outer ring works alone and the inner and outer rings work together,and verify the rationality of the design of the powder feeding channel;At the same time,the influence of pressurized air on powder flow convergence was studied at different angles;Select the optimal neural network model,fit the simulation data,and verify the simulation results.In view of the fact that the powder flow cladding process will cause the temperature of the cladding nozzle structure to rise,resulting in stress and deformation,and at the same time,it is necessary to ensure that the heat source generated by the selected laser beam can meet the needs of metal cladding,so the thermodynamic analysis of the powder flow cladding process is carried out.By setting up multiple laser cladding paths,the distribution of temperature field in the process of powder flow cladding was studied,and the temperature change trend of laser heat source was analyzed;At the same time,the heat source is set under the nozzle,and the temperature field,equivalent stress,equivalent elastic stress and total deformation in the nozzle during the cladding process are analyzed to study the heat resistance of the cladding nozzle under the effect of water cooling.The final simulation results are fitted with the neural network model with two factors and multiple hidden layers to verify the accuracy of the simulation results.