The Influence Of Ultrasonic Micro Forging To The Stress Field Of Laser Cladding Layer

Heavy equipment parts of marine engineering field usually manufactured by thick plate punching and electron beam welding compound method with high manufacturing costs and big difficulty.So this topic is proposed by using the method of increasing material manufacture technology,in the process of which material is not uniform temperature and great temperature gradient,therefore the complex residual stress of cladding layer is generated,the material tissue of the building is cast without forging process,Mechanical properties is poor,cannot satisfy the strength requirement of navigation.So it’s key issue to use ultrasonic impact to eliminate or reduce the residual stress,improve the surface quality and increase fatigue strength.The paper combines ultrasonic vibration with rolling,in the manufacturing process of laser cladding material,high frequency forging hammer metal surface to make the surface organization produce large compression deformation,which improves the stress condition of parts.Use the finite element software ANSYS to analyze the dynamics of ultrasonic rolling micro-forging system,as well as the process of laser cladding and high frequency of micro forging numerical simulation.Design micro ultrasonic rolling forging system and establish the model,determine the work frequency of the system by analyzing the dynamics of the moda,the calculation in the frequency under the action of ultrasonic vibration response of the system,and the response is the roller displacement curve of micro ultrasonic roller.The fuse material is TC4 titanium alloy.By means of thermal-structural sequential coupling method to numerically analyze and study the changes of temperature field and stress field in additive manufacturing process.Exploring the best forging temperature of TC4 material,and putting the high frequency vibration roller on the basis of the laser cladding model.In the process,add the temperature data in the process of load as load,using finite element contact algorithm of ANSYS software to Simulation of ultrasound micro rolling forging process.The stress after micro forging is the stress of cladding layer for the temperature field and stress of ultrasonic rolling,based on the research of the high frequency micro forging to remove stress mechanism,to explore the the change of stress field.Simulation results show that ultrasonic micro forging can change the stress field of laser cladding layer,uniform the stress distribution,and reduce the tensile stress,even transforme to compressive stress.The result of optimization of ultrasonic vibration system is important to expand the application range of ultrasonic rolling micro-forging.