支撑方式对曲轴渗氮过程畸变影响的有限元分析  

FEM Analysis of Crankshaft Distortion During Nitriding in Different Supporting Patterns

作　　者：姚新[1] 顾剑锋[1] 李勇军[1] 潘健生[1] 

机构地区：[1]上海交通大学材料科学与工程学院,上海200030

出　　处：《上海交通大学学报》2003年第2期194-197,共4页Journal of Shanghai Jiaotong University

摘　　要：对大型柴油机曲轴在渗氮过程中因支撑方式的不同而引起的曲轴畸变进行了有限元模拟分析 .实际测试了曲轴用 35Cr Mo钢在 50 0°C时的弹塑性和粘性力学参数 ,并运用陈化理论模型回归出应变与应力随时间变化的函数关系 .基于粘弹性有限元模型对 4种可能支撑方式下曲轴在50 0°C渗氮 50 h后的变形进行模拟 ,并选出了最佳的支撑方案 .实际测试结果表明 ,模拟结果基本反映了变形状况 .将其应用于实际生产 ,解决了大型曲轴渗氮畸变控制的难题 .The distortions of a large-scale diesel crankshaft during nitriding using four possible supporting patterns were simulated. The elastic and plastic properties of the crankshaft materials (35CrMo) were tested, and the viscous parameters were also measured and then fitted using a creep model. Displacements of the main journals up to 50 h nitriding in 500°C were analyzed based on the viscoelastic model. The simulation results are in agreement with the test ones, which help to choose the optimum supporting patterns.

关 键 词：渗氮 粘弹性 曲轴 畸变 有限元 

分 类 号：TG156.8[金属学及工艺—热处理]