枝杈类锻件挤压过程折叠缺陷形成研究  

Folding defect formation of branch-type forgings during extrusion

作　　者：赵德颖[1] 张连东[1] 朱恩领 赵明鑫[1] 

机构地区：[1]燕山大学先进锻压成形技术与科学教育部重点实验室,河北秦皇岛066004

出　　处：《塑性工程学报》2017年第2期10-16,共7页Journal of Plasticity Engineering

基　　金：河北省教育厅科学研究计划河北省高等学校科学技术研究青年基金项目(QN2015072)

摘　　要：枝杈类锻件是工程领域中广泛应用的一种关键零件。采用数值模拟方法揭示枝杈类锻件挤压成形过程中极易出现的折叠缺陷的形成机理,通过节点示踪法追踪了折叠缺陷的演化过程,研究了挤压过程中的应变场、速度场、温度场,获得了挤压过程中金属流动规律,明确了折叠缺陷的形成过程。通过对枝杈类锻件挤压时变形金属的流动规律的试验研究,验证了数值分析及结果的正确性。数值模拟和试验结果表明,通过减小冲头底锥相对直径和摩擦因子或增大模具圆弧外端与冲头环形平面距离,可以有效抑制或消除折叠缺陷。The branch-type forgings are key parts and widely used in engineering field. The numerical simulations were adopted to disclo- sure the formation mechanism of high-risk folding defect during extrusion process for branch-type forgings. Nodal tracer technique was used to track the evolution processes of folding defect, and by analyzing the field distribution characteristics of strain, velocity and temperature, the metal flow laws during extrusion were acquired and then the formation process of folding defect was achieved. The correctness of the numerical analysis and results were verified through experimental research on the metal flow law of branch-type forgings extrusion process. The results of numerical analysis and experiment indicate that folding defect can be reduced or eliminated effectively by reducing the rela- tive diameter of the cone bottom of the punch and friction factor or increasing the distance of mould arc end and the annular plane of punch.

关 键 词：枝杈类锻件 折叠缺陷 挤压过程 形成机理 

分 类 号：TG376.2[金属学及工艺—金属压力加工]