多台阶涡轮轴三辊斜轧减径量对轧制过程的影响规律研究

运用Simufact有限元软件建立了三辊斜轧两道次成形多台阶涡轮轴的仿真模型, 通过数值模拟分析了涡轮轴成形情况, 探究了减径量对轧制过程中轧制力、等效应力-应变以及外圆度误差的影响规律. 结果表明: 随减径量的增大, 轧件第1道次和第2道次的径向载荷、等效应力、等效应变和外圆度误差均呈增大趋势. 综合比较3种方案下的轧件成形情况, 方案2为最佳的道次减径量分配方案, 即第1道次减径6mm, 第2道次各台阶减径量分别为2、9和14mm.

Numerical simulation of multi-step turbine shaft in three-roll screw rolling on its influence by diameter reduction

The simulation model of multi-step turbine shaft in three-roll screw rolling with two-pass forming was established by using finite element software Simufact. The turbine shaft forming was numerically simulated to explore the influences of the diameter reduction on rolling force, equivalent stress-strain and external roundness error during the rolling process. The results show that with the increase of the diameter reduction, the radial load, equivalent stress, equivalent strain and external roundness error of the first and second pass also increase. The comprehensive comparison of the rolling forming conditions under the three schemes indicates that scheme 2 is the best pass diameter reduction distribution scheme. In this scheme, the diameter reduction in the first pass is 6mm, and those of each step in the second pass are 2mm, 9mm and 14mm respectively.