我厂生产的印染机械球铁铸件,一般为厚实中小件。其传统工艺是按顺序凝固原则设计,不仅浇冒口尺寸较大,工艺出品率低,且常产生缩孔、缩松和夹渣等缺陷。近几年来,运用均衡凝固理论与有限补缩原则,对原工艺进行改进,取得较满意的效果。现以球铁伞齿轮为例介绍均衡凝固工艺。 我厂球铁件牌号为QT450-10,其化学成分(％)为:C3.3～3.8、Si2.4～2.9、Mn0.3～0.6、P0.06～0.09、S0.02～0.03、 I plant the printing and dyeing machinery ductile iron castings, generally thick pieces. The traditional process is based on the principle of orderly solidification design, not only pouring riser size larger, craft production rate is low, and often produce shrinkage, shrinkage and slag and other defects. In recent years, the use of equilibrium solidification theory and the principle of limited compensation, the original process to improve and obtain more satisfactory results. Take dumbbell bevel gear as an example to introduce balanced solidification process. Our factory Nodular iron grade QT450-10, its chemical composition (%): C3.3 ~ 3.8, Si2.4 ~ 2.9, Mn0.3 ~ 0.6, P0.06 ~ 0.09, S0.02 ~ 0.03,