铸辗成形高温出模环形铸坯的热力耦合模拟  

Thermo-mechanical Coupling Simulation of Hot Temperature Demolding Ring Billet in Casting-rolling Forming

作　　者：武永红[1] 李永堂[1] 齐会萍[1] 闫红红[1] 

机构地区：[1]太原科技大学材料科学与工程学院

出　　处：《特种铸造及有色合金》2016年第2期200-204,共5页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金重点资助项目(51135007);国家自然科学基金资助项目(51174140;51575371);高等学校博士点优先发展计划资金资助项目(20111415130001)

摘　　要：针对铸辗连续成形环形铸件高温出模环节可能产生裂纹、变形等铸造缺陷,通过数值模拟,分析了不同出模温度对铸件热应力和应变的影响,探讨了相同出模温度条件下,不同环境温度和传热系数对铸件热应力和应变的影响。结果表明,环件内表面边界和中心部位应力及变形较大,易产生裂纹。此外,传热系数比环境温度对铸造应力影响大。出模后铸件采取保温措施后,铸件热应力和变形显著减小,裂纹倾向明显降低。Aiming at the possible cracks,deformation and other casting defects caused by casting-rolling continuous forming process,it was investigated for influences of different high temperature on the thermal stress and strain of the casting ring at the same external environment and effects of environmental temperature and heat exchange coefficient on thermal stress and strain of casting ring at the same high temperature.The results show that the inner surface frontier and the central position of the ring can generate a large principal stress and large deformation,resulting in occurrence of crack.In addition,effects of heat exchange coefficient on casting stress are the greater than those of the ambient temperature.After taking the heat preservation countermeasures for casting removed from the model,thermal stress and deformation of the casting are greatly reduced,and tendency of the cracks is reduced obviously.

关 键 词：42CrMo 离心铸造 高温出模 裂纹 

分 类 号：TG24[金属学及工艺—铸造]