轿车变速箱轴类件多工位冷精锻工艺及模具研究

轿车变速箱轴类件种类繁多,但其外形结构特点较为单一,其主要特征为细而长且多台阶.详细分析了该类锻件采用多工位冷精锻工艺方案的可行性.多工位冷精锻能顺利成形锻件,该工艺具有产品质量高、材料利用率高和生产效率高等优点,适合大批量生产.以输入轴为例,基于减径挤压工艺知识,制定了输入轴的五工位冷精锻工步图,计算并确定了工艺参数,研究了工步之间工艺参数的匹配关系;提出了多工位冷精锻模具设计原则和方法,设计了输入轴五工位冷精锻模;采用塑性成形模拟软件DEFORM-2D对输入轴各工步成形过程进行了模拟分析,验证了该工艺方案的可行性.

Study on multistage cold precision forging process and die of the shaft in gear-box

The shaft in gear-box has great varieties but of simple shape character. Its principal character is tenuous and multiteps. According to the shape character of the shaft in gear-box, a feasible scheme was analyzed in detail by which the forging was manufactured by multistage cold precision forging. The forging could be successfully shaped by multistage cold precision forging with such advantages as higher forging quality, higher material usage ratio, higher produce efficiency and suitable for batch production. In this paper, taking the input shaft part as an example, based on ironing process knowledge, five-stage process procedure sheet was set down. The processing parameters were calculated and confirmed. The matching relation of processing parameters among every step was studied. The principle and method of design multistage cold precision die were put forward, and five-stage die of cold precision forging was designed. The process of every stage was simulated on the DEFORM-2D software and the process scheme was confirmed rightly.