三辊行星轧制运动和管坯变形规律的仿真模拟

应用弹塑性大变形有限元法,对连铸铜管坯三辊行星轧制过程进行了三维有限元模拟研究。通过坐标变换的方法建立了三辊行星轧制有限元模型,该模型考虑了轧辊的倾斜角β和偏转角α。模拟分析得出三辊行星轧制过程中管坯断面要经受一个由圆形到三角形再归到圆形的变形过程。得出在三辊行星轧制过程中起到主要作用的是三向压应力状态,有利于坯料的大变形和提高轧制管材性能。同时模拟分析得到三辊行星轧制过程中坯料质点的运动轨迹和相应规律。该模拟计算对探索复杂的三辊行星轧制规律具有重要意义。

Computer simulation on the movement and deformation rules of three-roll planetary rolling process of Copper tube

Three-roll planetary rolling process of Copper tube is simulated by large-deformation elastic-plastic finite element method.The three dimensional planetary rolling model is established which considers the declining angle β and the offset angle α of the rollers.The changing process of the section profile of the workpiece is from a circle to a triangle,then from the triangle returns to another circle.Three axial compression stress state is the main stress state for three-roll planetary rolling process,which must be helpful to large deformation of the workpiece and improve the properties of Copper tube.The locus of a point in the workpiece is obtained by simulation.The simulation results have very important significance for investigation of the rules of three-roll planetary rolling process.