新型锡青铜合金阀体的数值模拟  

Numerical Simulation of a New Tin Bronze Valve Body

作　　者：吴兰鹰[1] 伏俊芳 

机构地区：[1]北京科技大学数理学院应用力学系,北京100083

出　　处：《铸造》2015年第6期546-549,共4页Foundry

摘　　要：采用原位生成纳米增强技术,可获得高性能的铸件。应用Pro CAST软件对新型锡青铜合金阀体的相关充型凝固过程进行模拟优化。根据材料特点及前期经验,采用雨淋式浇注系统。模拟结果分析发现在阀体侧法兰、底座以及支架顶部的颈圈等热节部位容易出现缩孔、缩松缺陷。经过优化设计,改进浇冒系统以及对浇注温度、浇注速度、型壳预热温度及离心转速等重要工艺参数进行分析研究,获得最佳参数组合,并模拟得到组织致密的目标铸件。The high-performance casting was obtained by in-situ nanoparticle reinforced technology. The filling and solidification process of valve body have been simulated by using of ProCAST software. The shower gating system was adopted on the basis of material characteristic and experiment. Simulation results reveal that the shrinkage and dispersed shrinkage defects were found in many places of the valve body, including the side flange, the base and the collar at the top of the bracket. An optimized design is developed, in which risers are considered to eliminate the shrinkage and dispersed shrinkage at the hot spots. Several key factors such as pouring temperature, pouring velocity, pre-heating mould temperature and centrifugal rotational speed are studied to obtain the most reasonable combination. The casting without defects was obtained by the simulation with the optimized parameters.

关 键 词：数值模拟 熔模离心铸造 阀体 缩孔 

分 类 号：TG146.11[一般工业技术—材料科学与工程]