锻压技术

多层金属热锻模在热锻服役下的循环载荷分析

英文标题：Cyclic load analysis on multilayer metal hot forging die during hot forging

作者：王华君姚亮鲁建飞彭军波

单位：武汉理工大学

分类号：

出版年,卷(期):页码：2015,40(10):1-4

摘要：

热锻模在进行连续锻造时，型腔表层受到循环的机械载荷与激冷激热载荷，导致模具表层产生疲劳裂纹与失效。采用多层金属模具结构可以缓解热锻模所受热力载荷、提高热锻模的高温磨损性能以及热-机械疲劳磨损寿命。以直齿圆柱齿轮坯的锻造为例，利用有限元模拟和计算模型获得了均质热锻模和多层金属热锻模在连续热锻条件下的循环温度场和应力分布。结果表明，相对均质热锻模，以钴基合金为覆层、高速钢为过渡层的多层金属热锻模可以有效改善模具表层温度和应力分布；在一定程度上揭示了多层金属模具结构在热锻服役条件下的力学行为。

When the hot forging die forged continuously, its surface occurred failure and crack due to the sharp changing of mechanical load and hot load. Multilayer metal hot forging die was applied to alleviate the hot loading, improve the properties resistance to high temperature abrasion and the life of the thermal-mechanical fatigue. For the forged spur gear, the cyclic temperature field and stress distribution of the uniformity forging die and multilayer metal hot forging die during the continuous forging was obtained by the FEM and calculation model. The results show that comparing with the traditional hot forging die, the multilayer metal hot forging die, whose surface is coated by cobalt alloy and whose transition layers are high-speed steel, can modify the temperature and the stress distribution of the die surface effectively. To a certain extent, its mechanical properties during the working are discovered.

基金项目：

国家自然科学基金资助项目(51475346)

王华君(1970-），男，博士，副教授

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