Based on the exhaust process design of the pouring system of the cylinder block castings,the exhaust gas of the sand core is reduced by hollowing out the thick and large sand core to reduce the weight,and the exhaust gas and feeding capacity of the sand mold and sand core are considered in combination with the structure and molding process of the castings,so as to effectively solve the exhaust problem during the casting process and reduce the defects such as pores in the casting.
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