本研究通过正交试验对基本工艺参数进行优化组合，得到无白口的优质铸件。
Therefore, the main process parameters of casting have been optimized using orthogonal design, thus obtaining high-quality castings without chill layer.
青岛和德隆机械有限公司专业生产各类优质铸件和铸造机械，是具有自营出口权的外向型企业。
Qingdao Hedelong Machinery Co. Ltd is an self oriented enterprise with export license, witch is engaged in the high quality castings and the foundry equipments.
与重力铸造相比，该工艺显著地提高了铸件成品率和机械性能，达到以较少的成本生产出较多优质铸件的目标。
As compared with static casting, above mentioned technique can improve yield and mechanical properties of castings significantly and provide sound castings at less cost.
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