气门热锻模具应变疲劳寿命分析  

Strain fatigue life analysis of hot-forging die for air valves

作　　者：梁姹 章争荣[1] 孙友松[1] 莫东强[2] 

机构地区：[1]广东工业大学材料与能源学院,广东广州510006 [2]怀集登云配件股份有限公司,广东怀集526400

出　　处：《锻压技术》2015年第3期78-83,共6页Forging & Stamping Technology

基　　金：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)

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. Mare 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 （4CrSMoSiV1） 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 forg- ing 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.

关 键 词：气门热锻模 低周疲劳 热机耦合 疲劳寿命 

分 类 号：TG315.2[金属学及工艺—金属压力加工]