【摘要】 采用EKK CAPCAST铸造模拟软件模拟球墨铸铁曲轴铸造过程,与Anycasting软件对比分析充型和凝固过程中可能产生缺陷的位置和缺陷大小。模拟结果表明,铁液充型平稳,无飞溅现象;凝固时在曲轴第三主轴颈心部存在较大孤立熔池区,易在此产生缩松缩孔缺陷。根据模拟结果提出相应优化措施,将浇注温度由1 400℃降低为1 390℃,在第三连杆颈处增加冷铁,加速第三主轴颈冷却速度。再次模拟结果表明,第三主轴颈孤立熔池区消失,缩松缩孔缺陷得到消除。EKK CAPCAST中精细的网格划分和精确的有限元算法为实现对缩松缩孔缺陷的定量分析提供了可能。更多还原

【Abstract】 The EKK CAPCAST casting simulation software was used to imitate the casting process of ductile iron crankshaft. Comparison simulation was carried out on the position and size of defects that might occur during filling and solidification process by using the EKK CAPCAST software and Anycasting software. The simulated results shows that the whole filling process runs smoothly and no splash occurs. However, There were large isolated molten pools appeared at the center of the third main journal of the crankshaft during the solidification, which made shrinkage cavity defects occur more easily. According to the simulation results, the pouring temperature was reduced from 1 400 ℃ to 1 390 ℃ and the chills were added at the third connecting rods to accelerate the cooling rate of the third main journal. The optimized results proved that the isolated molten pools inside the third main journal disappeared and the shrinkage cavity defects were eliminated. Besides, the fine element meshing and accurate finite element algorithm in EKK CAPCAST makes it possible to quantitatively analyze the defects of shrinkage cavity.更多还原