QFR-2型钩尾框锻造工艺优化

Forging process optimization on QFR-2 type of yokes

QFR-2型钩尾框是一种出口铁路车辆的关键部件,借鉴8000 t摩擦压力机的生产经验,对QFR-2型钩尾框在500 k J对击锤生产重新进行工艺分析,并制定了抬高尾部分模面和挂耳一体锻造的优化工艺方案。采用常温拉伸和高温压缩实验,测定了25MnCrNiMoA钢的材料常数和流变应力曲线,并导入Deform-3D软件,对制定的方案进行有限元分析。研究结果表明,优化后的方案更有利于金属的变形,可以减少打击次数,减少7道加工工序,使废品率从12%降低至3%,从而提高了设备使用寿命,降低了生产成本。

The QFR - 2 type of yoke is a key component for export railway vehicles. Therefore, according to the production experience of 8000 t friction press, the process of QFR - 2 type of yokes produced by 500 kJ impact hammer was re-analyzed, and the optimized process of raising the die face of tail part and forging lugs integrally was proposed. Then, the material parameters and the flow stress curves were obtained by room temperature tensile and hot compression experiments respectively. Furthermore, the Deform -3D software was input, and the proposed process was analyzed by the finite element. The results show that the optimized process is more conducive to metal deformation. It can reduce the number of blows and seven processing steps so as to decrease the scrap rate from 12% to 3%. Thus, the equipment life can be improved and the cost on production is reduced.