According to the principle that the volume of work piece is invariable during die forging, combining the roughcast pre forming and heat stretch forming process, the steel half spherical shell with double flange( equator and waist flange) can be forged.

• 按照模锻体积不变原理，锻造预成形毛坯与热拉伸成形工艺相结合的方法，压制出带双法兰（道法兰和腰法兰）钢半球壳。