锻压技术

轴类件多工位冷精锻工艺及模具的研究

英文标题：Research on multi-position cold forging process and die design for shafts

单位：华中科技大学

分类号：

出版年,卷(期):页码：2014,39(10):58-62

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Ra0.4~0.8 μm，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 semi-closed 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 Ra0.4-0.8 μm. The designed die has long service life and is reasonable for manufacturing, fixing and repairing.

基金项目：

国家科技重大专项资助项目（2011ZX04016-051）

夏巨谌（1941-），男，本科，教授

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