大型四分之一齿轮铸造工艺设计

Casting Technique Design of Quarter Part of a Large Gear

针对砂型铸造工艺生产的大型四分之一齿轮铸件在生产过程中经常出现的缩孔、缩松、张口变形等铸造缺陷,特别是把合口处的铸造缺陷,采用模数法对大型四分之一齿轮冒口补缩工艺进行设计,并通过增加外冷铁,改进浇注系统,增加把合口处冒口下补贴等措施对铸造工艺进行优化。并利用procast铸造模拟软件对铸造工艺进行验证。工艺改进后,产品的工艺出品率明显提高,缩松、缩孔、张口变形等铸造缺陷基本消除,生产出了合格的四分之一齿轮铸件。

The casting defects of quarter part of large gear such as shrinkage, dispersed shrinkage and distortion etc were analyzed, especially the joint position of the casting. The feeding system was designed by modulus method, and optimized measures were adopted as follow： chill, improved gating system, allowance riser at joint position of the casting. And the casting process was verified by ProCAST casting simulation software. After the process improvement, the production rate of casting was improved obviously, the dispersed shrinkage and shrinkage and distortion were eliminated, and the high-quality casting was obtained.