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沈阳铸造研究所、清华大学和沈阳第一阀门厂共同承担的机械基金共性技术课题“塑料模-精铸-负压复合铸造工艺及材料研究”于1991年6月16日在机械基金共性技术专业组副组长于恒高级工程师(教授
Shenyang Casting Institute, Tsinghua University and Shenyang No. 1 valve plant shared common fund mechanical technology topics “plastic mold - Casting - Negative Pressure Compound Casting Process and Materials Research” in June 16, 1991 in the common fund of Mechanical Engineering Deputy Head of Group Yu Heng Senior Engineer (Professor