飞轮金属型覆砂铸造工艺的缺陷分析及消除

Defects Analysis and Its Elimination in Flywheel during Sand-Coated Iron Molding

针对飞轮铸件生产中出现的缩松、缩孔等缺陷,对其金属型覆砂铸造成形过程进行了数值模拟。根据模拟结果,分析了金属型厚度和浇注温度等因素对凝固过程温度场的影响,并提出了相应的改进措施。发现减薄飞轮凸缘局部的覆砂层厚度以及增加冷铁,对消除缩松、缩孔缺陷的效果最好。

The sand-coated iron mould process of grey iron flywheel was simulated by the software to understand the shrinkage porosity（hole） in the flywheel. Through numerical simulation,effects of iron mould thickness and pouring temperatures on temperature field were analyzed,and responding countermeasures were presented. Through decreasing thickness of sand-coated on partial concave edge and adding chills,shrinkage porosity（hole） in grey iron flywheel was effectively eliminated.