【作者】 王荐；

【导师】 陈文琳；

【作者基本信息】 合肥工业大学 ， 材料加工工程， 2009， 硕士

【摘要】 汽车转向节是汽车前桥上的关键零部件,其质量的优劣直接决定着行车的安全,因此对其机械性能和外形结构有较高的要求。由于转向节外形比较复杂,制造难度大,而市场对转向节的需求量却在不断增加,因此采用新型工艺,通过高效、节能的方法生产出优质的转向节,成为各企业在转向节市场竟争中追求的目标。本文以HF6700轻卡转向节为研究对象,主要研究内容如下:1、对转向节进行结构分析,根据其结构特点提出在液压机上挤压制坯,摩擦压力机上锻造成形的生产工艺,即:下料——中频感应加热——挤压制坯——终锻成形,并针对该工艺,设计相应的模具结构。2、建立转向节成形过程的三维模型,利用有限元分析软件对转向节成形性进行分析,并对挤压制坯和终锻过程进行模拟,观察金属的流动规律及成形状况。在该工艺下进行物理实验来对比验证模拟结果。3、总结第一套成形方案的经验,结合传统的自由锻生产方式,提出新的成形工艺:下料——中频感应加热——挤压预制坯——预锻——终锻。4、对挤压、预锻、终锻过程分别进行数值模拟,分析了金属在模具型腔中的流动规律、成形力分布以及应力应变场、温度场的分布规律;5、研究了主要成形参数对挤压制坯过程的金属流动及成形力的影响,优化并确定成形工艺参数。更多还原

【Abstract】 Steering knuckle is one of the most important car key parts and a safety part. It’s quality directly determine the safe of driving, so the requirement to its mechanical performance an structure is very strict. With complex appearance, it is difficult to manufacture steering joint. But as the quantity demanded of knuckle is increasing, the pursuit of the objectives of each company is how to product high quality knuckle in highly active and energy-saving method.In the paper, HF6700 steering knuckle of light trucks is the object to study, the main research contents are as follows:1. Analyzed the structure of knuckle and gave an forming craft that is extrusion in hydraulic press and forging in friction press. Specific craft is baiting→heat up in the medium frequency induction furnace→extrusion performing→finish-forging. And designed the die structure of that craft.2. A three-dimensional model for forming about knuckle was established. Then the mold-ability of steering knuckle was analyzed and the process of extrusion performing and forging was simulated using FEM software to observe the flow rule and forming situation. In that craft, a check was done between results of physics experiment and simulated.3. After generalized the experience of first designed forming craft, combined methods of free forging production, a new forming process was given, i.e. baiting→heat up in the medium frequency induction furnace→extrusion performing→pre-forging→finish-forging.4. The flow rule in die impression and regularities of distribution for forming force, stress field, strain field and temperature field were all analyzed after simulation on process of extrusion, pro-forging and finish-forging.5. The influence of main forming parameter on metal flow and forming force in extrusion is analyzed, and then optimized and determined the forming parameter.更多还原