锻压技术

套筒冷挤压缺陷分析及优化设计研究

英文标题：Study on defect analysis and optimal design of sleeve in cold extrusion

作者：陈磊1 姚国平2 应浩3

单位：1.杭州电子科技大学 2.康灵集团有限公司 3.浙江省机电设计研究院有限公司

关键词：冷挤压数值模拟毛坯设计

分类号：

出版年,卷(期):页码：2015,40(10):65-68

摘要：

冷挤压是一种非常先进的绿色加工工艺，适合传动零件的坯料加工。冷挤压过程由于坯料变形大、材料流动复杂，模具和坯料设计难度大，常会发生各种缺陷。以套筒冷挤压为例，根据套筒的零件技术特征，确定了零件的冷挤压方案，并设计了挤压模具。基于数值模拟对零件成形过程的开裂缺陷进行了分析，采用材料跟踪和剖面对比的方法进行了模拟和试验比较，发现开裂的原因是由于毛坯的开孔过大导致孔边缘折叠形成了裂纹源。对开孔尺寸进行了优化，成功消除了开裂缺陷，得到了最佳的成形方案。

Cold extrusion is an advanced and environmental-friendly manufacturing technology. It suits for the manufacture of transmission parts. The defects happen frequently owing to the large deformation of blank, complex materials flow and difficult in designing mould and blank. For the cold extrusion of the sleeve, according to the technical characters of the sleeve, the cold extrusion method was determined. The extrusion dies were designed. The cracking defect in the cold extrusion was analyzed by numerical simulation. The simulation and experiment results were compared by the materials tracking and profile comparison. Therefore, the cause of the crack source was that the large opening hole folding on the edge of hole. Therefore, the hole size in the blank was optimized，the crack was eliminated and the best forming scheme was achieved.

基金项目：

浙江省科技厅公益性研究项目（2014C31092）

陈磊（1979-），男，博士，副教授

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