20CrMnTi齿轮钢棒材热连轧有限元模拟  

Finite Element Simulation of Hot Continuous Rolling Process of Gear Steel 20CrMnTi Bar Products

作　　者：肖玉[1] 洪慧平[1] 冯富春 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《特殊钢》2014年第2期16-19,共4页Special Steel

摘　　要：通过对棒材热连轧过程的分析,建立了20CrMnTi钢800~1 150℃,变形量0~0.8,应变速率0~3s^(-1)的Hensel-Spittel流变应力模型;利用LARSTRAN/SHAPE有限元软件模拟了20CrMnTi从200 mm×200 mm的方坯经8道次连轧为Φ90 mm圆棒的过程,分析了轧件在圆弧侧壁的圆孔型和直线侧壁的圆孔型下轧制过程中的应力场、应变场、温度场和轧制力及力矩的变化情况。模拟结果表明,轧件圆角部位等效应力、等效应变较大且温度较低,容易出现轧制质量缺陷;圆弧侧壁的圆孔型轧制圆钢时的精度略高于直线侧壁的圆孔型。A Hensel-Spittel flow stress model of steel 20CrMnTi with strain 0 - 0.8 and strain rate 0 - 3 s at 800 - 1 150℃ is established by analysis on hot continuous rolling process of round bar. With using finite element software LARSTRAN/SHAPE the simulation of process of steel 20CrMnTi with 8 pass rolling from 200 mm x 200 mm billet to （I）90 mm round bar has been carried out to analyze the variation of stress, strain and temperature field, and rolling force and torque of rolling stock during process of rolling by round pass with curved side wall and round pass with straight-line side wall. Simulated results show that at round comer of stock the equivalent stress and equivalent strain are bigger and the tem- perature is lower than that at other region, so the defects easily occur at the comer of stock; the precision of round bar rolled bv round Pass with curved side wall is sliehtlv hizher that by round Bass with straight-line side wall.

关 键 词：棒材 热连轧 20CrMnTi齿轮钢 有限元 模拟仿真 

分 类 号：TG335.62[金属学及工艺—金属压力加工]