Special-shaped hole forming electrode

The invention provides a special-shaped hole forming electrode which can enable the machining precision of a special-shaped hole section of a blade to be higher and guarantee the cooling effect of a turbine blade cooling air film hole. The forming die sequentially comprises a clamping section, a transition section, a forming section and a guide section. The clamping section is cylindrical and is connected with a clamping device on a machine tool main shaft; the forming section is used for machining a round hole of the blade, and the shape of the forming section is matched with that of the round hole of the machined blade; the transition section is matched with the forming section in shape, so that the rigidity of the forming section is ensured; the guide section is a cylindrical tip, and the butt joint position of the guide section and the blade round hole is accurate through the tip. 本发明提供了一种异形孔成型电极，其可以使得叶片的异形孔段的加工精度更高，保证涡轮叶片冷却气膜孔的冷却效果。其顺次包括夹持段、过渡段、成型段及导向段；所述夹持段呈柱形与机床主轴上的夹持器连接；所述成型段用于加工叶片的圆孔，所述成型段与加工叶片的圆孔形状相