无余量精密铸造大型涡轮叶片模具设计

Design of Investment Casting Mould for Large Turbine Blade

某重型燃气轮机第四级透平动叶片(四涡叶片)结构复杂、尺寸大、精度要求高,给模具的设计和加工带来困难。介绍了四涡叶片无余量精铸件模具的设计及加工工艺。通过模具叶身部分的分段来保证环长尺寸并采用工艺孔配合模具加工与组装定位;同时采用斜块自锁夹紧机构保证模具工作时的稳定性。

It is difficult to design and machine the investment casting mould for the forth-level large turbine blade of a heavy gas-turbine due to its complicated structure and large dimension as well as high accuracy requirement.Design and machining of the mould were described,in which the loop dimension is ensured by adopting segmentation treatment for blade body,and fabrication hole is used to localize the mould machining during installation manufacturing,and self-locking clamping unites are adopted to ensure the stability of working time of the mould.