Development And Experimental Study Of Ultrasonic Laser Vibration Accumulation Device

The recently observed requirements of aerospace,high precision and military machinery to improve the material performance has called for a single laser stacking technology to be improved.Considering the wide range of applications of ultrasonic vibration in fields such as casting,welding and cladding,ultrasonic vibration has now been introduced into the laser direct metal forming system for composite machining.Therefore,the effect of ultrasonic vibration on laser deposition and the influence of strong amplitude on the thickness of stacking layer are studied.In this paper,the ultrasonic vibration platform is designed focusing on the strong amplitude ultrasonic vibration table and the weak amplitude ultrasonic vibration table.The selection of sandwiched piezoelectric transducers and the calculation of the parameters of the horn are performed.Using the harmonic response analysis module in ANSYS Workbench 15.0,the vibration thin plates of different thicknesses were analyzed to obtain the amplitude and select the most suitable thickness.The base fixture is designed so that it can effectively clamp and accurately position the base body.Finally,the frame of the vibration table is designed so that it can support the vibration thin plate and can cooperate with the laser processing system.The IPG-YLS-3000 fiber laser and the 6 axis robot of the FANUC M-710iC/50 model are used to carry out the laser deposition experiment on the substrate and the experimental results are investigated to draw important conclusions.It was found that since the ultrasonic waves have cavitation and acoustic flow effects,they have a positive effect on the organization of the deposition layer.Moreover,the macroscopic morphology of the deposition layer is improved,as well as the refinement of the crystal grains,the uniform texture of the components and the improvement in hardness and tensile strength.Similarly,the surface quality and mechanical properties of the parts have been improved.Also,it was found that any increase in ultrasonic amplitude increases the influence on the accumulation layer,hence,the thicker the equiaxed grain accumulation layer and columnar structure has also been varying degrees of refinement.Finally,the grain size and porosity with ultrasonic amplitude enhancement caused thinning and reduced accumulation of mechanical properties has been further strengthened.