不同工艺参数对大口径厚壁无缝钢管垂直挤压过程的影响

针对火电、核电设备使用的基础构件大口径厚壁无缝钢管,利用有限元模拟软件Deform-3D对钢管的垂直挤压过程进行数值模拟,通过改变挤压比、凹模锥角等参数对其等效应力、等效应变、温度场及载荷进行分析。结果表明:随着挤压的进行,坯料等效应力、等效应变及载荷都是先逐渐增加后趋于平稳;随着挤压比以及凹模锥角的变化,等效应力、等效应变及载荷也发生不同程度的变化;并且当挤压比为6、凹模锥角为30°时最有利于坯料的成形。

Effects of different technological parameters on vertical extrusion process of large diameter seamless steel tube with thick wall

The large-diameter seamless steel tube with thick wall is one of the foundation components of thermal power and nuclear equipment,and whose vertical extrusion process was simulated by the software of finite element simulation Deform-3D.The effective stress,effective strain and the load of top die were analyzed through changing the parameters such as extrusion ratio,die mould taper angle and so on.The simulation results show that with the increase of deformation degree,the effective stress and load of the blank increase gradually first and then reach a plateau.Along with the change of extrusion ratio and concave die taper angle,the equivalent stress,equivalent strain and load of top die have different changes.And when the extrusion ratio is 6 and cone angle is 30°,the forming pipe has the best quality.