140MN大型热模锻压力机模架结构方案的有限元分析

大型热模锻压力机模架价值高、使用年限长、加工复杂。在模锻精度要求越来越高的今天,选择合适的导向形式和顶杆形式具有重要的意义。本文应用ANSYS Workbench软件对不同的模架结构方案进行有限元分析,结果表明:花瓣形顶杆孔模座与矩形顶杆孔模座最大应力相当,但是矩形顶杆孔周围应力为264MPa,花瓣形则为251MPa,花瓣式模架受力情况更好;当顶杆孔圆角半径为8mm时模架最大应力为614.6MPa,圆角半径为12mm时模架最大应力为541.5MPa,适当增大圆角半径可降低最大应力;此外,X形导轨模架比导柱后置式模架刚性更好。

Finite element analysis of die holder structure for 140MN large-size hot die forging press

The die holder for large-size hot die forging press has some characteristics,such as high cost,long service life and complex machinability.It is of significance to choose suitable guiding form and ejecting form for the die holder,since the die forging requires high precision.The finite element analysis was run on different die holders by ANSYS Workbench.The result shows that the max.stress of die holder with petal shaped ejector rod is near to that with rectangle ejector rod.The stress around the hole for rectangle ejector rod is 264 MPa meanwhile that for petal shaped rod is 251 MPa,which shows that the latter is in better condition.The max.stress of die holder is 614.6 MPa when the corner radius of hole for ejector rod is 8 mm.It decreased to 541.5 MPa with a corner radius of 12 mm,which indicates that the increasing corner radius makes max.stress declining.Furthermore,the rigidity of die holder with X-shaped is better than that with rear guide pin.