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0前言导叶持环是工业汽轮机中重要铸件之一。材质为QT400－15，铸件单重从几百公斤到三吨成一个系列。铸件呈半只喇叭形，最大处直径可达2235。厚断面处的模数超过2.5cm，最大可达7cm以上。 导叶持环铸件生产的难点在于模数最大处的厚壁部位，要切割出2～3条圆环形叶根槽。
0 Preface Guide vane ring is one of the important castings in industrial steam turbines. Material is QT400-15, casting a single weight from a few hundred kilograms to three tons into a series. Castings were half a trumpet-shaped, up to a maximum diameter of 2235. Thick section of the modulus of more than 2.5cm, up to 7cm or more. Difficulties in the production of guide vane ring ring castings lie in the thick wall where the maximum modulus is and 2 or 3 circular rooted root grooves are cut.