Veining defects have been effectively prevented and eliminated by improvement on gating system, especially by special additive to core sand and sinter coating on surface of sand core.
The scheme of this essay begins with research of reasonable dosage of additive agent, aims at improve the integrated performance of mixture by enhancing the performance of cement and sand slurry.
从水泥稳定类外加剂的合理剂量的研究着手，以求从改善结合料性质提高水泥稳定类基层的综合路用性能。
3
The additive of correcting metal penetration for green sand mold casting, made from the waste of oil further fabricated——namely DK material, is researched in this paper.