Experiment And Simulation Study On Inner Ribbed Cylindrical Parts Spinning With Ultrasonic Vibration

Inner ribbed cylindrical parts have important applications in the aerospace field.Flow spinning process can be used to form such parts integrally.The formed parts have the advantages of good comprehensive mechanical properties and high reliability.However,the height of the inner ribs that can be formed at room temperature is insufficient,which becomes a major difficulty.This paper proposes a new method of introducing ultrasonic vibration into the flow spinning process.Using the acoustic softening effect and surface effect of ultrasonic vibration can reduce the deformation resistance of the material,as well as the resistance encountered during flow,thereby increasing the rib height.However,under the coupling of ultrasonic vibration and flow spinning process,the flow characteristic of the material is more complicated.How to adjust the appropriate process parameters to obtain higher ribs is the problem that need to be solved at present.This paper analyzes the mechanical properties of aluminum alloy2219 under ultrasonic vibration,builds an ultrasonic vibration assisted spinning experiment system for inner ribbed cylindrical parts,and conducts experiments and finite element simulation studies to research the above problems.The main research contents are as follows:(1)The effects of ultrasonic vibration on the properties of 2219-O aluminum alloy under uniaxial tensile and compression tests are studied.The results show that ultrasonic vibration reduces the yield strength,flow stress and the surface roughness of the material.Based on the experimental data,the hardening equation of 2219 aluminum alloy combining acoustic softening effect and material work hardening is established.The relationship between the friction coefficient and amplitude is also obtained.(2)Combining the ultrasonic vibration device and the spinning machine,the experimental platform of inner ribbed cylindrical parts spinning with ultrasonic vibration is built.The ultrasonic vibration loads along the radial direction of the cylinder.The experimental results prove that the ultrasonic vibration can effectively increase the height of the ribs and improve the surface quality of the cylindrical parts.(3)Based on the ABAQUS simulation platform,a finite element model of ultrasonic vibration-assisted spinning for inner ribbed cylindrical parts is established,which is verified by comparing with experimental results.The simulation and experimental results show that ultrasonic vibration reduces the deformation resistance of the material,increases the plastic strain of the ribs,and improves the flow state of the ribs and materials near the ribs,which are beneficial to the formation of the ribs.The simulation study of the influence of process parameters shows that the rib height can be increased by appropriately increasing the pressed amount and feed speed under ultrasonic vibration assisted conditions.