锻压技术

曲轴热锻过程数值模拟及中心疏松区追踪分析

英文标题：Numerical simulation of crankshaft hot forging process and tracking analysis of center loose area

作者：朱美玲陈学文孙乐民贺俊光周会军

单位：河南科技大学

分类号：TG316.3

出版年,卷(期):页码：2014,39(8):146-149

摘要：

以六拐曲轴为例，运用Transvalor Forge-3D有限元模拟软件模拟了曲轴热锻过程的温度场、应变场以及金属流动情况。研究表明，飞边区域分模面处的温度明显高于工件内部区域，应变较大，塑性变形激烈，金属流动较复杂。从三维角度观察热锻过程中金属的流向，发现原材料中心次优层金属在热锻过程中易流到轴颈内侧，使次优层金属暴露在锻件表层或近表层，从而出现磁痕。研究预测出现磁痕的位置与实际相符，并提出修改预锻型腔尺寸、提高锻造温度等预防出现磁痕的措施。

Taking six throw crankshaft for an example, the temperature field, strain field and metal flow in hot forging process of crankshaft were simulated by using the finite element simulation software of Transvalor Forge-3D. The results show that, the temperature of flash parting surface is significantly higher, the strain value is larger, the plastic deformation is more intense, and the metal flow is more complex than the ones in inner region of workpiece. The metal flow in the hot forging process was observed in three dimensions, and it is found that the center sub-prime layer metal is easy to flow into the inside of axle journal during hot forging process, so the center sub-prime layer metal is exposed to the surface or near surface of forgings, and the magnetic particle indication appears. The predicted location where the magnetic particle indication occures in this research fits well with the practical case, and the measures such as modifying the preforming die cavity size and improving the forging temperature to prevent the magnetic particle indication were put forward.

基金项目：

河南省重点科技攻关计划项目（132102210119）

朱美玲（1989-），女，硕士研究生；陈学文（1970-），男，博士，教授

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