锻压技术

气门热锻模具应变疲劳寿命分析

英文标题：Strain fatigue life analysis of hot-forging die for air valves

作者：梁姹章争荣孙友松莫东强

分类号：TG386

出版年,卷(期):页码：2015,40(3):78-63

摘要：

针对气门热锻模具的早期疲劳失效，结合MSC.Marc和MSC.Fatigue数值模拟软件对气门热锻模具的成形过程进行热机耦合模拟，并进行热作模具钢H13(4Cr5MoSiV1)凹模的疲劳仿真与低周疲劳寿命预测。对凹模在热锻过程中的温度分布、等效热应变分布、应变-寿命曲线、周期性变化的节点等效应力等因素进行模拟分析，最终获得了凹模的疲劳寿命分布云图。研究结果表明：最先发生失效的位置在凹模R根部区域，寿命仅1460次，与实际生产情况中模具的失效位置及寿命值相符合，实现了气门热锻模具的疲劳寿命模拟预测。

For the early fatigue failure of hot-forging die for air valves, the forming process of air valves was numerically simulated by MSC.Marc software based on thermal-mechanical coupling model, and the fatigue process of die and the low-cycle fatigue life prediction of the hot-working die steel H13 (4Cr5MoSiV1) were carried out by MSC.Fatigue software. The temperature, the equivalent thermal strain distribution, strain-life curve, equivalent stress of the cyclical changing node and other factors in the die were analyzed during the hot forging process. The distribution of die fatigue life was obtained finally. The results show that the failure locations firstly concentrate on the area of R root, with a fatigue life of only 1460 times. The analysis results are in a good agreement with that in reality, and the fatigue life prediction of the hot-forging die is realized.

基金项目：

国家自然科学基金资助项目（50975050）;广东省“扬帆计划”引进创新创业团队专项资助项目（201312G02）

梁姹（1990-），女，硕士研究生

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