车用全纤维泵体精密成形技术研究

Study on Precision Forming Technology of Pump Body with Full Fiber for Vehicles

泵体是车辆发动机中的关重零部件,形状复杂,原采用金属型铸造,性能无法满足使用要求。零件成形工艺改为精密锻造。采用有限元法着重研究了其精锻成形过程,再现了泵体在筋部顶端不易充满的缺陷。通过设计不同的预制坯,优化出了预制坯形状。经过试制,结果表明,泵体锻件所有的窄筋、凸耳均充填完满,大头部分外轮廓不再切削加工。泵体锻件的使用性能,尤其是疲劳性能有较大的提高,对节省原材料、缩短制造周期有很大的意义。

The pump body is a very important part in the engine for vehicles. Because its shape is complex, the original production is metal mold casting which doesn＇t meet the requirements of its performance. Forming process of the part was modified to precision forging. The precision forging process was mainly studied by using finite element method. Defects of insufficient filling of the pump body in the rib top were reproduced. Through the design of different preforms, the shape of the preform was optimized. After trial production, the results indicate that filling of all narrow rip and lugs on the pump body is full,the outer contour in big head part of it is no longer cutt. Using performance of the pump body forging, especially the fatigue properties is greatly improved. It has a great significance to save raw material and to shorten the manufacturing cycle.