高铬铸铁衬板在生产中常产生夹砂缺陷,导致铸件废品率很高。虽然我们采取了插钉子、铸件上下表面加冷铁、倾斜浇注、型砂中加煤粉等措施,但夹砂缺陷依然存在,后来采用表面干型工艺铸造,虽消除了夹砂缺陷,但费时、费力、费料。今年来,我们采用耐火泥代替粘土混制面砂(暂称耐火砂),有效地防 High chrome cast iron liner in the production often have nip defects, resulting in a high rejection rate of castings. Although we adopted the methods of inserting nails, adding chilled iron on the upper and lower surfaces of castings, inclining pouring and adding pulverized coal in the sand, etc., the sand-holding defects still existed and were later cast by a surface dry process. Although the sand-holding defects were eliminated, Strenuous, fee. This year, we use refractory mud instead of clay mixed sand (tentatively called refractory sand), effectively prevent