Batch production shows there are no shrinkage cavity and porosity in casting, and no blowholes and sandinclusions on the top surface. The yield of the casting is 81%.
经批量生产验证，铸件内无缩孔、缩松缺陷，上表面无渣孔、气孔缺陷，工艺出品率81%。
2
With high magnification of microscopy, a lot of petroleum inclusions were found, which occur in the fissures of sand grains and authigenic minerals in the source rock.