厚壁件铸造工艺设计及数值模拟优化  

Design of Casting Process for Thick Walled Casting and Optimization of Numerical Simulation

作　　者：黄书林[1] 陈怡[1] 杨刚[1] 杨屹[1] 刘剑[1] 

机构地区：[1]四川大学制造科学与工程学院,四川成都611065

出　　处：《热加工工艺》2016年第7期105-107,116,共4页Hot Working Technology

摘　　要：由高合金铸钢制成的厚壁铸件,由于其壁厚差异较大,热节集中,铸造过程中易在热节处产生缩孔缩松。本研究通过对铸件材料和结构分析,同时对某工厂现有工艺进行模拟,分析产生缺陷的原因,然后提出改进措施,优化了铸造工艺。结果表明,在该厚壁件轴承孔内添加大小为Φ76 mm×23.5 mm的冒口、采用顶注式浇注时,可实现铸件的顺序凝固,将缩孔缩松集中在冒口内,获得了优良铸件,并降低了铸造成本。Thick walled casting is made of high alloy steel, and it has a concentrated thermal center because of its bigger difference of wall thickness, thus, the shrinkage defects are easy to appear at the hot spot in the casting process. The material and structure of the casting was analyzed. The casting process of a factory was simulated and the reasons for the generation of the casting defects were analyzed. Then, the measures were improved in order to optimize the casting process. The results show that when adopting top gating system and the size of φ76 min×23.5 ram riser lying in the bearing hole, the progressive solidification of the casting can be realized. The shrinkage cavity and porosity defects concentrate in the riser. Thus, a high-quality casting is produced successfully and the cost is reduced in the meanwhile.

关 键 词：厚壁铸件 数值模拟 缩孔缩松 

分 类 号：TG26[金属学及工艺—铸造] TG249.5[机械工程—精密仪器及机械]