汽车转向节臂端部冷精整工艺优化

目的 得到单向压缩冷精整的精整量与预变形孔半径和深度之间的变化规律，以及摩擦因数大小同回弹量之间的关系。方法 对转向节臂端部锻件上下表面进行预变形凹槽孔处理，并建立锻件单向压缩冷精整的弹塑性有限元模型，利用ABAQUS有限元软件进行数值模拟仿真，分析摩擦因数对表面质量的影响，得到优化后的工艺参数，并进行实验验证模拟结果的准确性。结果 摩擦因数越大，冷精整后的转向节臂端部锻件的鼓形越明显。在精整量为1 mm的情况下，当预变形凹槽孔的半径为4 mm、深度为0.3 mm、单向压缩量为1.1 mm、摩擦因数为0.2时，能够得到最好的表面质量。结论 当摩擦因数相同时，预变形凹槽孔的半径越大，径向位移越小，而回弹量基本保持不变。

Optimization of Cold Finishing Process for the End of Automobile Knuckle Arm

The work aims to obtain the relationship between the change rule of the one-way compression cold finishing and the radius and depth of the pre-deformed hole and between the friction coefficient and the rebound. The upper and lower surfaces of the forgings at the end of the knuckle arm were treated with pre-deformed grooves, and the elastoplastic finite element model of the forgings with unidirectional compression and cold finishing was established. The ABAQUS finite element software was used for numerical simulation to analyze the effects of the friction coefficient on the surface quality. The optimized process parameters were obtained. The accuracy of the simulation result was verified by experiment. The results showed that the greater the friction coefficient, the more obvious the drum shape of the knuckle arm end forging after cold finishing. When the finishing amount was 1 mm, the radius of the pre-deformed groove hole was 4 mm and the depth was 0.3 mm, the unidirectional compression was 1.1 mm and the friction coefficient was 0.2, the best surface quality can be obtained. When the friction coefficient is the same, the larger the radius of the pre-deformed groove hole, the smaller the radial displacement, and the rebound remains basically unchanged.