通过改进型砂配方，提高砂型紧实度和煤粉质量，是提高大口径阀门铸件表面质量的有效途径。
The surface quality of huge bore valves has been improved by changing the matches of molding sand, and increasing the hardness of sand mould and controlling the quality of the coal ash.
本研究主要探讨了用气冲造型湿型砂来生产铁路钩缓铸钢件，从型砂的配方和型砂系统的控制等几个方面来优化其性能。
This research mainly explores the production of steel castings with air flush molding green sand and the improvement of its character from the molding sand recipe and mold sand system control.
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