某工厂生产的5MD缸体体积小,适合一箱多型浇注,最初设计浇注工艺时采用底注式浇注系统,铸件出现冷隔、裂纹等缺陷。为了解决铸件出现的上述缺陷,首先对原工艺方案进行了模拟,对浇注系统进行分析之后改进工艺,在新工艺方案数值模拟结果中未发现铸件有缺陷。采用新工艺试制铸件,对铸件进行检测,也未发现有缺陷,因此,采用新工艺方案批量生产铸件,解决了5MD缸体存在的冷隔和裂纹缺陷,获得力学性能满足技术要求的优良铸件。 A 5MD cylinder produced by a factory is small in size and suitable for multi-type casting in one box. When the casting process was originally designed, the bottom-pouring casting system was adopted. The defects such as cold separation and cracks occurred on the castings. In order to solve the above defects of castings, the original process plan was simulated first, and the process was improved after the pouring system was analyzed. No defects were found in the numerical simulation results of the new process plan. Therefore, adopting the new process scheme to mass produce castings solved the cold gap and crack defects existing in the 5MD cylinder body and obtained the excellent castings with mechanical properties meeting the technical requirements.