湿型砂技术的发展现在为铸造工作者提供了优质型砂的处理和控制的新的手段。通过改进型砂的试验方法,铸件的质量可以提高,而成本大大降低。不管美国的铸造工作者是否喜欢,他们现已成为世界性的铸造工作者。铸造行业的竞争不再是局限于市内或国内,而可能扩大到全世界。进入世界铸造市场,这对美国的铸 The development of wet sand technology now offers foundry workers new ways of handling and controlling high-quality sand. By improving the sand test method, the quality of castings can be increased, and the cost is greatly reduced. No matter whether American foundry workers like it or not, they are now world foundries. The competition in the foundry industry is no longer confined to the city or the interior, but may expand all over the world. Into the world foundry market, which the United States cast