球墨铸铁曲轴铸造缺陷预测与验证  

Prediction and Verification of Casting Defects of Ductile Iron Crankshaft

作　　者：胡波 余宁[1] 李德江[1] 田迎新 曾小勤[1] HU Bo;YU Ning;LI Dejiang;TIAN Yingxin;ZENG Xiaoqin(School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;Shanghai Sandmann Foundry Co., Ltd., Shanghai 201805, China)

机构地区：[1]上海交通大学材料科学与工程学院,上海200240 [2]上海圣德曼铸造有限公司,上海201805

出　　处：《铸造技术》2019年第10期1076-1080,共5页Foundry Technology

摘　　要：采用EKK CAPCAST铸造模拟软件模拟球墨铸铁曲轴铸造过程,预测铸造充型与凝固过程中可能产生缺陷的种类、位置和大小,并结合生产试验进行对照验证。模拟结果表明,现有生产工艺条件下铁液充型过程平稳,未发生湍流现象;但是凝固过程中第4主轴颈出现较大孤立熔池区,凝固时间较晚,产生较大收缩应力,此处易产生约6 mm^3大小的收缩裂缝缺陷。模拟预测结果在实验中得到证实,在第四主轴颈内发现裂缝缺陷。将浇注生产的曲轴剖开,裂缝包裹的体积与预测缺陷形成区域体积在同一数量级。金相观察和硬度表征发现,裂缝内外组织性能存在明显不同,是凝固时间不同步所致。The casting process of nodular cast iron crankshaft was simulated by EKK CAPCAST casting simulation software, and the types, locations and sizes of possible defects during mold filling and solidification were predicted, and combined with the production test for verification. The simulation results show that the filling process of molten iron is stable and no turbulence occurs under the existing production conditions. However, during the solidification process, a large isolated molten pool area appeared in the fourth spindle neck, which had a relatively late solidification time and produced a large shrinkage stress. Shrinkage crack defects of about 6 mm^3 were easy to occur here. The simulated prediction results are confirmed in the experiment, and the fracture defect is found in the neck of the fourth spindle. The cast crankshaft is cut open and the volume of the fracture envelope is on the same order of magnitude as the volume of the predicted defect formation area. Metallographic observation and hardness characterization show that there are obvious differences in microstructure properties inside and outside the fracture, which are caused by the unsynchronization of solidification time.

关 键 词：球墨铸铁 曲轴 铸造模拟 铸造缺陷 

分 类 号：TG245[金属学及工艺—铸造]