A Method Of Electromagnetic Vibration Detection For Droplet Transition State In The Additive Manufacturingof Laser Melting Wire And Prototype System Research

The addtive manufacturing technology of laser melting wire has the advantages of high material utilization rate and good welding performance,and has great application prospect in aerospace,large-sized ship,automobiles,electronics and biomedical fields.However,in application,there are also problems that the forming process is not easy to control and the quality of forming parts is not easy to guarantee and so on.The results have shown that the droplet transition state is directly related to the formingquality,but the traditional detection methods have great limitations,such as: CCD image detection is difficult to eliminate smoke and splash,the acoustic signal detection methods have many problems,such as wide and unmarked frequency range,much clutter and heavy workload,the heat signal detection methods also have many problems such as difficult to clear the shape of the weld pool,to calculate the shape and size,and difficult to adjust the electrical signal detection.Therefore,this paper aims at the problem,and takes droplet transition state as the object,putting forward a method and principle of electromagnetic vibration detection,and designing the electromagnetic vibration prototype detection system according to the principle and method.And then,the experimental research is carried out.The results are as follows:(1)Firstly,an electromagnetic vibration detection method suitable for the production of droplet transfer state is proposed,and the application of electromagnetic vibration principle in the manufacture of the material is studied in detail.(2)Secondly,based on the principle of electromagnetic vibration,the overall framework of the prototype detection system is proposed,and the key components of the prototype system are determined to conclude electromagnetic vibration sensing and excitation module,vibration acceleration sensing module,charge-voltage conversion module,signal acquisition and transmission integrated Module,and the prototype system model structure is also determined,providing a basis for the module design.(3)Based on the overall framework of the prototype detection system,through the consideration of the influence of ambient temperature and performance,the material and size of the functional components are determined to complete the electromagnetic vibration sensor excitation moduledesign;through the charge voltage signal conversion module circuit analysis,Stability to consider,using LP2904 model and other major components to complete the conversion module module design;in order to ensure its work at high temperatures and weak signal fully received,selecting the PCB357B03 model vibration acceleration sensor module;through the integrated module Of the launch and acquisition circuit research and analysis,determining the main components of the launch and acquisition to complete the design of integrated modules.(4)Through the experimental test of the electromagnetic vibration prototype detection system,the optimal performance module of the electromagnetic vibration sensing and excitation module is determined,and the feasibility of the electromagnetic vibration excitation and the reception on the substrate is verified.Electromagnetic vibration prototype detection system provides the practical application possible.(5)Finally,the experimental study on the transition state of laser fused material is carried out.The results show that the prototype system can be used to detect and discriminate the droplet transition state,which provides favorable conditions for the subsequent optimization of the function of the prototype system.