铸铁件应力与变形的数值模拟及试验研究  

Numerical Simulation and Experimental Investigation on Stress and Strain of Iron Castings

作　　者：卫东海[1] 李克锐[1] 吴现龙[1] 李桐[1] 

机构地区：[1]郑州机械研究所,河南郑州450052

出　　处：《铸造》2013年第2期134-137,共4页Foundry

基　　金：国家"高档数控机床与基础制造装备"科技重大专项资助项目(2012ZX04010031)

摘　　要：用JSCAST铸造模拟软件,对常用牌号铸铁件的应力框模拟试样进行铸造变形解析,对其内部应力及变形进行预测和对比分析。用树脂砂铸造工艺浇注QT600-3应力框铸件,以测量实际应力和变形,验证模拟结果,并提出减小铸铁件应力及变形的措施。结果表明,铸件的实际应力及变形与模拟结果基本一致;球墨铸铁的残余应力明显高于灰铸铁,且强度越高,应力越大,密烘铸铁的应力及变形状态与球墨铸铁相似,高弹性模量有利于保证铸铁件质量。建议从选择优质铸造合金材料、改善铸件结构、优化铸造工艺和提高组织均匀性等方面减小铸铁件的残余应力。Simulation software JSCAST was used for the stress and strain analysis of stress frame specimen of different grades iron castings. The preliminary prediction and assessment of the stress and strain in the stress frame specimen were done. By pouring QT600-3 stress frame casting in resin sand, the actual stress and strain were measured. According to the results, the actual stress and strain were consistent with the simulation results. The residual stress in ductile iron was significantly higher than that in gray iron and the higher the strength is, the higher the stress will be. The stress and deformation state of Meehanite cast iron are similar to ductile iron. High elastic modulus was beneficial to the quality of iron castings. Proposals were put forward fi＇om selecting high-quality alloy materials, improving structure, optimizing casting process and increasing the microstructure uniformity to reducing the residual stress.

关 键 词：灰铸铁 球墨铸铁 密烘铸铁 应力框 应力 变形 数值模拟 

分 类 号：TG250[金属学及工艺—铸造]