Processing Optimization of Investment Casting Large Stainless Steel Ball Valve

Yang Shengnan; Wu Wenyun; Wang Donghong; Cao Yanggen

doi:10.15980/j.tzzz.2016.06.018

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Processing Optimization of Investment Casting Large Stainless Steel Ball Valve
Vol. 36, Issue 6, Pages: 623-625(2016)
Published： 2016 ，
DOI： 10.15980/j.tzzz.2016.06.018

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[1]杨胜男,吴文云,汪东红,曹阳根.大型不锈钢球阀熔模铸造工艺优化[J].特种铸造及有色合金,2016,36(06):623-625.

Yang Shengnan, Wu Wenyun, Wang Donghong, et al. Processing Optimization of Investment Casting Large Stainless Steel Ball Valve. [J]. Special Casting & Nonferrous Alloys 36(6):623-625(2016)
[1]杨胜男,吴文云,汪东红,曹阳根.大型不锈钢球阀熔模铸造工艺优化[J].特种铸造及有色合金,2016,36(06):623-625. DOI： 10.15980/j.tzzz.2016.06.018.

Yang Shengnan, Wu Wenyun, Wang Donghong, et al. Processing Optimization of Investment Casting Large Stainless Steel Ball Valve. [J]. Special Casting & Nonferrous Alloys 36(6):623-625(2016) DOI： 10.15980/j.tzzz.2016.06.018.

摘要

大型不锈钢汽轮球阀结构复杂、壁厚不均

存在孤立热节

熔模铸造时存在局部缩松。借助ProCAST软件

在分析原有工艺方案的基础上

对浇冒系统的结构进行了重新设计

并采用特殊方法引入铸造冷铁

使铸件实现自下而上的顺序凝固

成功消除了球阀铸件孤立热节处的缩松缺陷

提高了产品的合格率。

Abstract

The large ball valve has complex structure with non-uniform wall thickness and isolated hot spots

so partial shrinkage porosity is always generated in the investment casting

decreasing the qualified rate of ball valve.The gating system was redesigned based on ProCAST software analyzing original system.Chills were also introduced through special method to realize sequential solidification from bottom to up

so the shrinkage porosity in the isolated hot spot of the ball valve was eliminated successfully

improving effectively qualified rate.