Simulation Analysis And Optimization Of Spinning Riveting Process Of The Third Generation Hub Bearing Unit

As the key parts of automobile,the third generation hub bearing unit is widely used in the car field.As the key technology of the third generation hub bearing unit tooling,spinning riveting technology is one of the important factors to make the structure of the third generation hub bearing unit compact.In recent years,with the development and promotion of the third generation hub bearing unit,its quality has also been widely concerned.The influence of spinning riveting process on the third generation hub bearing unit has become a hot topic to improve the product qualification rate and product quality.In this paper,the finite element software is used for static,dynamic simulation,and theoretical analysis to study the influence of spinning riveting process on the third generation hub bearing unit.The main research contents are as follows:(1)Combined with Hertz theory and the structural characteristics of double row angular contact ball bearing,the negative clearance and ball contact load of the third generation hub bearing unit are studied.According to the contact load of the ball,the axial preload and starting torque of the third generation hub bearing unit under negative clearance are further calculated.The relationship between negative clearance and contact load,starting torque is established.The axial preload obtained by theoretical calculation is used in ABAQUS static simulation to verify the relationship between negative clearance and contact load.Based on the static results,the dynamic simulation is carried out to verify the relationship between the theoretical calculation of negative clearance and starting torque.(2)ABAQUS dynamic simulation was used to simulate the working conditions of different riveting head inclination angle,feed speed and rotation speed in spinning riveting process.The stress nephogram and clamping force of the third generation hub bearing unit under different spinning and riveting conditions were compared and analyzed.The influence of tilt angle,feed speed and rotation speed on the third generation hub bearing unit is studied.The results show that the third generation hub bearing unit is affected by the inclination angle,feed speed and rotation speed.Appropriate tilt angle,feed speed and rotation speed can ensure the tightness of flanging part and improve the clamping force.(3)ABAQUS dynamic simulation is used.This paper studies the influence of flanging outer diameter,flanging thickness,small inner ring outer diameter expansion,spline diameter and other structural parameters,clamping force,riveting force and other mechanical parameters of the third generation hub bearing unit under the premise of determining the inclination angle,rotation speed and spinning riveting processing time.The results are compared with the actual measurement.At the same time,the relationship between theoretical negative clearance and simulated contact load,and the relationship between theoretical negative clearance and clamping force are analyzed.The relationship between the clamping force and the structural parameters such as the expansion of the outer diameter of the small inner ring,the flanging thickness and the flanging outer diameter is also discussed.Finally,a set of suitable processing parameters of spinning riveting is determined,and the fatigue life of the third generation hub bearing unit obtained from the simulation of spinning riveting is calculated.It provides a reference for the subsequent optimization of spinning riveting process.