Optimization of casting conditions for heat and abrasion resistant large grey iron castings

数字模拟技术被申请为海洋的引擎在大生铁铸造物优化扔的设计和条件。由模子充满和团结序列的模拟，以前的扔的条件的问题被分析并且标记为大柱体班机部分的改进从这些结果被导出。特别寒冷的数量和位置被优化增加机械性质并且在铸造物最小化收缩和 microporosity。超声的测试，穿入测试并且机械性质测试与修改的扔为部分被执行条件。它证明在铸造物的 nodefects 被发现，生产率能清楚地被增加。机械性质也满足了要求的说明。

Numerical simulation technology was applied for optimizing the casting design and conditions in large cast iron castings for marine engine. By the simulation of mold filling and solidification sequences the problems of the previous casting conditions were analyzed and marked improvements for large cylinder liner parts were derived from these results. Especially the amount and positions of chills were optimized to increase the mechanical properties and to minimize the shrinkage and microporosity in the castings. Ultrasonic testing, penetration testing and mechanical property testing were carried out for the parts with the modified casting conditions. It showed that no defects in the castings were found and the productivity could be distinctly increased. The mechanical properties satisfied also the specification demanded.