A series of cylinder block castings produced by ZHY casting are specially matched for mainstream models such as Audi, maiteng and Suteng of Volkswagen. They are all typical thin-walled castings. The wall thickness of the water jacket at the thinnest place is about 3 mm, and the material brand is close to ht220. The double melting process is adopted, clay sand Wet Mold high-pressure molding is adopted, with 2 pieces per mold, and the pouring molten iron mass is about 130 kg. Due to different types of castings, the pouring temperature is controlled at 1420 ~ 1460 ℃, and the pouring time is 10 ~ 14 s, 50 / 100 mesh raw sand shall be used for sand core, the concentrated particle size of three screens shall be ≥ 80%, and the amount of W (SiO2) shall be ≥ 92%.
Adopt triethylamine cold core process, moisture resistant resin, dip coating water-based coating and drying. A series of casting quality problems have been encountered in the process of development and production. Through continuous improvement of process and use of new materials, deepen operation and strictly control process quality.