法兰盘热挤压工艺设计

Process Design and Analysis of Hot Extrusion of Flange

以法兰盘为研究对象,对法兰盘进行了结构及工艺性分析,并对变形程度进行了校核,拟定了先镦挤法兰和台阶,然后分步成形中心孔的工艺方案。利用有限元分析软件对法兰盘成形过程进行了模拟分析,预测了法兰盘成形过程中的缺陷,缩短了试模周期。用方案一镦挤法兰和台阶时变形量过大,无法同时成形,因此提出先成形法兰后成形台阶的方案二,但成形台阶时坯料受力不均匀且变形量很大,也无法成形。方案三先成形台阶,后成形法兰,最后反挤中心孔,并对成形过程各工步成形载荷进行了校核,结果显示,各工步成形效果良好,单工步最大载荷及总的载荷均满足设备要求。

In this paper, the structure and process analysis of flange was performed. The degree of deformation was checked, and then a process scheme was drawn up as follows ： upsetting extrusion of flange and stair as the first process then forming center hole step by step. The finite element analysis software was used to simulate the forming process, which predicted the defects during forming process of flange and shortened the tryout period. In the first scheme, the flange and stairs could not be formed simultaneously because of excessive deformation. Therefore, the second scheme of forming flange first and then forming stairs were draw up, but the stairs still could not be formed because of uneven loading and large deformation. Finally, the third scheme of forming stairs first and then forming flange, then forming of flange center hole by backward extrusion as the final step were draw up, during which the forming load of each step was checked. The results showed that shaping was well during each step and the maximum load of single step and the total load met the equipment requirements.