交叉缩放椭圆管冷压成形的数值模拟

NUMERICAL ANALYSIS OF COLD FORMING FOR ALTERNATING ELLIPTICAL AXIS TUBE

对新型强化换热管——交叉缩放椭圆管的冷压成形过程进行了有限元数值模拟。计算了成形后交叉缩放椭圆管的残余应力分布并比较了三个典型截面上的残余应力状况。分析了模具过渡段倾斜角对成形的影响。结果表明残余应力最大值出现在换热管过渡段的内壁面;模具过渡段倾斜角较小时将使换热管表面的残余应力显著增大。分析结果有利于加工过程中控制参数的合理选择。综合考虑交叉缩放椭圆管的换热性能和加工后的残余应力状况,给出了模具过渡段倾斜角的参考值。

Alternating elliptical axis tube can efficiently enhance the heat transfer. The cold forming process of the tube was numerically analyzed by a finite element model. The three-dimensional distribution of residual stress was investigated and the residual stresses on three representative sections were compared. The effect of the transitional angle of the die was analyzed. The results show that the maximum residual stress appears on the inner surface of the transitional region and the residual stresses on surfaces remarkably increase as the transitional angle of the die increases. Forming control parameters can be optimized based on the numerical results. Taking account of the heat transfer performance and the residual stress magnitude of the tube, a propositional transitional angle for industrial application is given.