大型半齿轮铸件的铸造工艺设计

The Casting Technique Design of Large Half-Ring Gear

针对砂型铸造工艺生产的大型半齿轮铸件在生产过程中出现的变形、缩松、缩孔、裂纹等铸造缺陷,采用模数法对大型半齿轮冒口补缩工艺进行计算,通过增加外冷铁,改进浇注系统,增加拉筋等措施对铸造工艺进行了优化。工艺改进后,产品的工艺出品率明显提高,变形、缩松、缩孔、裂纹等铸造缺陷基本消失。

The large half-ring gear has casting defects such as distortion, dispersed shrinkage, shrinkage and cracks, etc. Optimization measures were adopted as follow： the body of large half-ring gear was divided into some parts： each modulus was calculated, in order to design the size of every riser： suitable gating system design： layout of chill. After optimization, the casting defects such as distortion, dispersed shrinkage cavities and shrinkage disappears, the technological yield increases and it could stably produce a high-quality casting.