Research On Radial Forging Process And Numerical Simulation Of Cone Tube

Radial forging technology is widely used in the processing of the long shaft parts and pipe parts with internal structure,It is a kind of scrapless and precise metal forming process.The process can significantly improve the plasticity of the material,enhance the mechanical properties of parts,at the same time with high processing precision,high forging efficiency,high utilization of materials,a good forming quality and so on.In this paper,the conical tube which is the important parts of the fast wire connector was taken as the research subject,and the process and numerical simulation of the Radial Forging of the conical tube was carry out.Both ends of the cone tube are conical,and equipped with internal parts,and the internal surface quality requirements are relatively high,the mandrel can not be added during the forming process,just by adjusting the process parameters,with the outer surface quality to ensure that the inner surface quality.The quality of the inner surface of the cone tube can be measured by the vary of the thickness of the cone tube.The more uniformly of the cone tube thickness varies,the better of the taper of the inner surface of the cone tube,and the closer with the internal part.In view of the forming process of the cone tube,the main research work in this paper includes the following aspects:Based on the finite element software ABAQUS,two-dimensional axisymmetric model and three-dimensional finite element model of the cone tube for radial forging are established,and the process parameters are optimized,the experimental results are compared with the simulation results,the influence of multi-hammer on the quality of radial forging forgings is discussed,the numerical simulation of radial forging of the cone-tube parts is carried out.First of all,by analysis the process of the cone tube,determined the radial forging forming process of the cone tube.Based on the finite element software ABAQUS,the two-dimensional axisymmetric model of cone tube was established.The influence of axial feed and friction coefficient on the wall thickness of cone tube radial forging forgings was analyzed by single factor variable method.In the three-dimensional finite element model,by replacing the the pawl drives the billet with a revolving part drive the hammer around the local axis by an equal relative angle,the improved model in the premise of ensuring the accuracy of the calculation can be set a larger mass scaling factor,greatly improving the computational efficiency.Compared the experimental results with the simulation results,the correctness of the three-dimensional finite element model is verified.Secondly,the effects of axial feed,rotation angle and friction coefficient on the wall thickness of cone tube were studied by orthogonal test,and the minimum value of the mean value of the square of the thickness of the deflector curve is taken as the optimization target,and obtained a set of optimal combination of process parameters.In addition,the influence of the length of the straight wall of the cone tube on the thickness of the cone tube is analyzed,and the simulation results are verified by experiments.Then,under the same process parameters,the influence of two,three and four hammers on the wall thickness of the cone tube was analyzed,and the information such as strain and maximum radial forging during the radial forging process were analyzed.Finally,based on the finite element numerical simulation results and experimental verification,the radial forging process of tapered parts that can not join the mandrel were studied.By the orthogonal test,the influence of axial feed,rotation angle,friction coefficient and hammer taper angle on the wall thickness of the cone tube is studied,the optimal combination of technological parameters is obtained.Using the origin software to fit the relationship between the hammer cone angle and the taper angle of the inner surface of the cone tube.