| The stamping forming process has many advantages,such as convenient operation,high precision,stable quality and lower cost.Therefore,the current manufacturing method of the suspension control arm widely adopts the stamping forming method.The safety performance of the suspension control arm is directly related to the driving safety,steering stability and riding comfort of the car.Nowadays,when the suspension control arm is developed and designed,the control arm will be subjected to structural finite element analysis.However,in the current finite element structure analysis of most control arms,the effect of the actual processing and forming process on the product structure performance has not been considered.In the actual processing and production,the impact of the stamping process on the performance of the control arm can not be ignored.Therefore,in order to fit the reality and improve the accuracy of simulation analysis,it is necessary to take into account the thickness change of the control arm caused by stamping during simulation analysis.Under this background,this paper takes a McPherson front suspension control arm as the research object,and conducts strength and fatigue analysis of the control arm without considering the impact of stamping and considering the impact of stamping,respectively.The main purpose is to investigate the impact of the stamping process on the safety performance of the control arm.This article uses computer simulation technology to simulate the actual working conditions of the control arm.The main results include the following:(1)The multi-body dynamic model of the whole vehicle is established and assembled in ADAMS / car,and the measured road spectrum of the six-component force of the wheel center is imported and the vehicle is simulated and solved to obtain the dynamic load of the control arm connection point;the front suspension system model imports the theory to calculate the tire contact force under the limit condition,and the static load of the control arm connection point under the limit condition is solved.(2)Establish the finite element model of the lower control arm,and then perform the strength analysis of the control arm according to the static load of the limit working condition extracted in(1),and calculate the maximum stress under the limit working condition;The dynamic load spectrum extracted in(1)is subjected to fatigue analysis to obtain the fatigue life of the control arm without considering the punching action.The results show that the strength and fatigue of the control arm meet the design requirements.(3)According to the geometric model and parameters of the original lower control arm,dynaform was used to perform stamping simulation to obtain the stamping result model of the lower control arm with stamping effect,and the thickness change information in the new mesh model was mapped to get new finite element model considerations of stamping action.(4)Re-analyze the strength and fatigue of the obtained finite element model of the control arm considering the punching action.According to the comparison between the obtained results and the original results,the results show that after considering the impact of stamping forming,the stress of the control arm under extreme conditions increases and exceeds its yield strength,which cannot meet the design requirements;the fatigue life is also reduced accordingly,still meeting the requirements.(5)Improving the stamping forming process to obtain stamping results with less thickness variation and more uniform distribution after stamping.Repeat the operation steps in(3),(4)to perform strength and fatigue analysis on the new finite element model,the results show that after the improvement of the stamping process,the strength and fatigue life of the structural analysis results that do not consider the impact of stamping on the control arm are still somewhat reduced,but all meet the design requirements.The research results show that the control arm can meet the design requirements when the stamping quality of the control arm is good,but the stamping has a great influence on the structural performance of the control arm and cannot be ignored.This conclusion can also be extended to the analysis of other stamping parts in actual engineering.Stamping forming will more or less affect the performance of stamping components.Taking the impact of stamping forming into structural analysis can improve the simulation accuracy,so this paper studies The methods and conclusions are of general significance in the analysis and research of other stamping parts,and can provide a certain reference for subsequent research on related problems. |
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