Research On Ultrasonic Vibration Technology Based On Laser Deposition Repair Process

Laser Deposition Repair is a advanced remanufacturing technology based on LaserRapid Forming, which involves many fields such as laser, material, mechanics, computer andso on. It makes use of additive manufacturing method to grow new repaired componentinstead of changing the traditional method of removing materials. The repaired zones and thesubstrate are integrated metallurgically. But the surface smoothness of BT20repairedcomponent is poor and the internal organization has some defects such as porosity, lack offusion, crackles and residual stress, which affect overall performance of the repairedcomponent. In view of the application of ultrasonic technology in foundry and welding canreduce porosity, residual stress and crackles. We come up with the concept—“laser depositionrepair technology based on ultrasonic”.Laser deposition repair technology based on ultrasonic is about buliding ultrasonicvibration device on the basis of existing laser deposition repair technology. The compositetype ultrasonic horn is designed according to propagation characteristics of ultrasonic and theprinciple of standing wave and optimize the horn with the help of the ANSYS finite elementanalysis software to determine the optimal position of flange.In order to optimize the ultrasonic parameters, the bulided ultrasonic vibration advicewas used to do BT20repairing experiment, the results show that under the appropriateultrasonic power, the surface roughness of repaired component is good and the defects ofinternal organization such as porosity, lack of fusion have been prevented. The crystalboundary is no clear but the uniformity is better. In addition, the α sheet length becomes short.The sound field was investigated by using the finite element simulation, the results showthe variation of the sound field with time and interpret the mechanism of action of Ultrasoniccavitation effect. In addition, according to the change curve of the sound pressure and thephysical simulation experiment, the mechanism of ultrasound and the wetting behavior ofmolten pool was investigated. At last, by making use of simulation and experiments, the propagation characteristics ofultrasonic in big BT20repaired components was investigated, which lays the foundation ofadding ultrasonic to the big repaired components.