DK4缸体冒口优化研究

Study on Optimization of Riser of DK4 Engine Cylinder Block Castings

通过DK4缸体毛坯气孔种类鉴别,分析气孔形成的基本原理,发现气孔多发的根本原因是浇注时型腔内气体压强大于铁液总压强。通过增加冒口数量和高度,缓解型腔内气体压强的同时提高了液体表面压强,使两者大小关系发生逆转,减轻了气孔缺陷。结果表明,生产出组织致密、形状完整、性能优良、各项指标达到用户要求的缸体毛坯。

Based on the analysis of the basic principle of pore formation through the DK4 engine cylinder block castings pore identification, the root cause was found to be that the pressure of gas in the cavity was greater than the total pressure of molten iron during pouring. By increasing the number of risers and the height of risers, the pressure of molten iron surface was increased while the pressure of gas in the cavity was decreased. The results show that the engine billets with dense microstructure, complete shape, excellent performance and various indexes can meet the user requirements.