Research On Quasi Dynamic Features And It's Process Parameter Selection Of High-speed Ball Spinning For Thin-walled

High-speed ball spinning is a kind of ball as a deformation tool of the powerful spinning process,combined forging,extrusion,stretching,bending,rolling,rolling and rolling and other advantages of the process.As the ball as a deformation tool has a good surface roughness and dimensional accuracy,making its processed products to achieve high accuracy.At the same time,during the spinning process,the deformation of the blank is localized by point,which has the characteristics of small deformation area and high deformation stress.It is usually used to process some metal materials with high hardness and poor plasticity index.In this paper,the mechanics,kinematic characteristics and process parameters of high speed ball spinning are studied.The main contents and results are as follows:1)With high-speed ball as the object of study,the motion hypothesis of the ball in the spinning process is put forward on the basis of a large number of experiments.Through the kinematics and mechanics analysis of the ball,considering the centrifugal force and the gyro moment of the ball,Learning model.Based on VC ++ platform programming,this kinetic model is solved to solve the kinematic parameters of the ball under different working conditions and the contact points of the three-point contact ball.In this paper,the dynamic simulation of the spinning process is carried out by ABQUS software,and the results are compared with the theoretical calculation results,and the experiment is verified experimentally.Improve the high-speed ball spinning analysis theory,for the ball spinning production process provides a theoretical support.Which provides a theoretical basis for further study of the deviation of the pipe caused by the deformation of the ball during the spinning process,the deformation of the mold and its control,friction and heat control.2)Based on the results of a large number of simulation experiments,the effects of thinning,feed ratio and ball diameter on the influence of the three main process parameters and their mutual coupling on the average stress Andthe relationship between the four equations is simulated by the multivariate nonlinear function,and the optimal process parameters corresponding to the minimum stress triaxiality are calculated.The results show that the surface cracking of the pipe after spinning can be improved obviously by using the optimum process parameters given in this paper,and the ball rolling of the magnesium alloy tube Compression molding performance has been improved.The results of the study greatly facilitate the spinning process in the process of selecting the process parameters.3)A method for machining annular trenches in the inner wall of steel pipe by ball rolling is presented.Based on the theory of spatial analytic theory and the assumption of radial helix feed,a simplified expression of the boundary curve between radial and tangential contact area between ball and workpiece is given.Through the curve integral,the radial And tangential contact area.Based on the data obtained from the example,the relationship between the spinning depth,the ball diameter,the spinning feed and the spin pressure is studied.The comparison between the calculated data and the finite element simulation data obtained from the analytical model given in this paper shows that The analytical model obtained in this paper is feasible.4)With the current vertical low-speed spinning machine as a reference,the design of high-speed spindle-driven high-speed ball spinning test machine,and gives high-speed spinning when the radial eccentric radial force caused by uneven vibration solution.As well as high-speed bearings axial bearing capacity is low,low-speed bearings and can not achieve high-speed spinning solution.