摘要
针对ZL702A复杂柴油发动机缸盖开展快速研制。通过缸盖铸件热分析,设计砂型反重力铸造工艺,并对铸件充型凝固过程温度场进行模拟,采用3DP技术快速制备砂型、砂芯,完成了缸盖毛坯快速试制。分析了铸件内腔孔隙形成原因,提出了缸盖孔隙缺陷解决方案并通过实际浇注结果进行验证。对铸件本体组织、缺陷和性能进行了统计分析,随着铸件本体二次枝晶臂距从21μm增加至56μm,本体抗拉强度降低25 MPa,屈服强度降低6 MPa,伸长率也从8%降低至4.5%。当二次枝晶臂距在40~45μm内,针孔等级从0上升至5级时,合金抗拉强度、屈服强度、伸长率均逐步降低,最大降幅分别为25 MPa、29 MPa、3.5%。
This article is aimed at the development of complex diesel engine cylinder head casting process.Through the thermal analysis of the cylinder head casting,the anti-gravity casting process of the sand mold was designed,and the temperature field of the casting filling and solidification process was simulated.The 3DP technology was used to quickly prepare the sand mold and sand core,and the rapid trial production of the cylinder head blank was completed.The causes of porosity formation in the inner cavity of the casting were analyzed,and the solutions to the porosity defects of the cylinder head were proposed and verified by the actual pouring results.As the secondary dendrite arm distance increased from 21μm to 56μm,the tensile strength of the casting body was reduced by 25 MPa,the yield strength was reduced by 6 MPa,and the elongation was also reduced from 8%to 4.5%.When the secondary dendrite arm distance was within 40-45μm.When the pinhole grade increased from 0 to 5,the tensile strength,yield strength,and elongation of the alloy gradually decreased,and the maximum decrease was 25 MPa,29 MPa,and 3.5%respectively.
作者
李泽华
冯志军
李宇飞
辛世伟
刘文龙
刘丹
马英博
胡定云
LI Ze-hua;FENG Zhi-jun;LI Yu-fei;XIN Shi-wei;LIU Wen-long;LIU Dan;MA Ying-bo;HU Ding-yun(Shenyang Research Institute of Foundry Co.,Ltd.,Shenyang 110022,Liaoning,China;China North Engine Research Instiute,Tianjin 300000,China)
出处
《铸造》
CAS
北大核心
2022年第10期1299-1304,共6页
Foundry
关键词
缸盖
铸造工艺
针孔缺陷
二次枝晶臂距
力学性能
cylinder head
casting process
pinhole defect
secondary dendrite arm distance
mechanical properties
