轴类件多工位冷精锻工艺及模具的研究  

Research on multi-position cold forging process and die design for shafts

作　　者：夏巨谌[1] 金俊松[1] 邓磊[1] 王新云[1] 夏汉关 董义 王耀祖 

机构地区：[1]华中科技大学材料成形与模具技术国家重点实验室,湖北武汉430074 [2]江苏太平洋精锻科技股份有限公司,江苏泰州225500

出　　处：《锻压技术》2014年第10期58-62,共5页Forging & Stamping Technology

基　　金：国家科技重大专项资助项目(2011ZX04016-051)

摘　　要：针对轴类件多阶梯的结构特点,提出了多工位冷缩径挤压与半闭式镦粗联合精锻工艺方案、工艺优化方法和多工位冷精锻模具的设计的6个原则;并针对轿车输入轴设计了五工步精锻工艺及相应的模具。圆棒坯料经球化退火至硬度≤140-150 HBS,清理氧化皮和进行磷化处理后,在Y28-400/400双动压力机上采用单工位间断操作和在YK34J-1600五工位精锻液压机多工位连续操作的方法分别进行了工艺试验。试验结果表明,所得汽车变速器输入轴精密锻件尺寸精度高,表面粗糙度可达Ra0.4-0.8μm,材料利用率可提高到90%-95%;多工位冷精锻组合模具结构设计合理,便于加工、安装和维修,可显著提高使用寿命。According to the shape characteristics of shafts, a multi-position process of combination of cold shrink extrusion and semiclosed upsetting was proposed, relatively, the process optimization method and six principles of die design were put forward. A five-position-cold forging process and relative dies were designed for a car driving shaft. After the hardness ≤ 140 - 150 HBS of rod blanks through ball annealing, cleaning up oxide coating and phosphating treatment, the multi-position process experiments were carried out by using both single-station die on Y28 -400/400 double action hydraulic press and multi-station die on YK34J - 1600 five-station hydraulic press. The results show that the forgings obtained by the process have fine dimensional accuracy and quality, the material utilization reaches 90% 95% , and the surface roughness reaches RaO. 4 -0. 8 p,m. The designed die has long service life and is reasonable for manufacturing, fixing and repairing.

关 键 词：轴类件 多工位冷精锻工艺 模具 冷缩径挤压 半闭式镦粗 

分 类 号：TG316[金属学及工艺—金属压力加工]