It is simple process, less pollution, low cost, good quality casting, and can meet producing of locomotive casting, that the investmentpattern was made from the shell mold was made from silica sol.
采用硅溶胶粘结剂制造型壳，工艺简单，污染少，成本低，铸件质量好，满足机车类精铸件生产要求。
2
Adoption of this pattern is a point-in-time decision depending on whether near or medium-term advantages justify the necessary investment.
这种模式的采用是一个即时的决策，这个决策依赖于近期或中期的利益来证明是否值得进行必要的投入。
3
Full-mold casting is a technique similar to investment casting, but instead of wax as the expendable material, polystyrene foam is used as the pattern.