Study On Strength Analysis And Molding Simulation Of Automobile Steering Rods Ball Pin

Steering rod ball pin is a key component of the vehicle steering system,whose strength,quality and reliability directly affect the sensitivity of the vehicle steering system and driving comfort.At present,due to the split type assembly of the ball shell,the tie rod and the ball head,the formed tie rod ball head assembly has problems such as low bearing strength,complicated process and structure,which causes the driving comfort and safety to be reduced.In response to these issues,this paper made the following research:(1)The structural features of the steering rod ball pin was analyzed by the method based on theory and practice,which means observing the actual rod ball pin structure and extrusion molding process in the enterprise.In order to improve the production level,efficiency and quality of the rod ball pin,a reasonable process plan was formulated according to the analyzing of cold extrusion process based on the structure of the tie rod ball pin.(2)The three-dimensional software CATIA was used to establish the model of the tie rod ball pin and the model of the forming die.In order to make the performance of the tie rod ball pin safer and more reliable afterforming,the reasonable material and parameters,such as friction coefficient and extrusion speed,are selected.(3)The molding process of cold extrusion was simulated by the finite element analysis software DEFORM-3D,which found out the flow rule of metal in the extrusion process.The influence of forming parameters,such as friction coefficient,material and extrusion speed,on the extrusion process was studied by changing the extrusion process plan and parameters.(4)The strength of tie rod ball head assembly was analyzed.To solve the problem of low bearing strength of the tie rod ball head assembly,the theoretical analysis of the steering tie rod ball head was carried out by the theory of strength.The stress analysis of the extrusion die was done to find out the parts with lower strength in actual production,which verified whether the strength met the requirements.