缸盖铸造工艺的讨论——车用中小型发动机灰铸铁缸体缸盖铸件生产工艺(3)

Discussion on Casting Method of Cylinder Head——Casting Production Technology of Gray Iron Cylinder Block and Head for Medium-Small Vehicle Engine(Ⅲ)

介绍灰铸铁缸盖铸造工艺的基本设计原则。主张缸盖的分型面一般应设在底面。由于中小型缸盖补缩不是主要问题,所以宜采用底注浇注系统;对于中型偏大的缸盖,则宜采用阶梯式浇注系统。对砂芯材料的选用、排气系统的设计、以及如何防止缩松引起的渗漏、如何提高内外表面质量、尺寸精度和位置精度等问题进行了讨论。

The basic casting method-design principle of cylinder head was introduced. It was considered that the mold joint of cylinder head should be put at the bottom of the casting. Since feeding is not an important problem for small and medium heads, bottom gating system should be the best option, however, for medium and somewhat big heads, the step gating system would be relatively proper. A detailed discussion was conducted on the selection of materials for various cores, design of venting system, as well as how to prevent shrinkage-caused leakage, how to improve internal and outer surface quality, how to improve the dimension and position accuracy, and so on.