一种小型连体缸盖的铸造工艺

Research on the Casting Process of a Small Integral Cylinder Head

研究一种三缸连体缸盖在生产过程中出现的气孔、内腔披缝、断芯等铸造问题。通过减小底注截面积、降低浇注温度、采用发气量低透气性好的涂料等措施解决了气孔问题。利用低温固化工艺等解决了砂芯变形导致的披缝问题。通过制芯预填芯砂并设计制作二次组芯辅助装置等措施解决断芯问题。通过工艺改进,产品的质量由15%的废品率降至5%以下。

The casting problems such as porosity,cavity seam and broken core in the process of production of a three-cylinder connected cylinder head are studied.The porosity problem was solved by reducing the cross-sectional area of the bottom injection,re-ducing the pouring temperature and adopting the paint with low gas output and good permeability.The crack problem caused by sand core deformation was solved by low temperature curing technology.The problem of breaking core is solved by pre-filling core sand and designing and making secondary core auxiliary device.Through process improvement,the quality of the product is reduced from 15%scrap rate to less than 5%.