Defects: car castings have not fully integrated gap, the transfer of the edge is smooth, the gap that cold; cast part is not full, the lack of castings, the end of the arc was called insufficient. Prevention: increase the pouring temperature of molten metal. Increase the degree of vacuum to improve the exhaust speed. Reduce the amount of foam plastic appearance, reduce the pre-hair density and make the appearance of dry. Choose a reasonable pouring program and pouring system structure, such as the top-pouring system, hollow sprue. Try to shorten the total length of the casting system, so that the liquid metal flow shortens, the filling process is smooth, the casting speed in the case of non-splashing, the better. Cold septum and insufficient pouring causes: liquid metal and the appearance of the replacement process, the liquid metal front resistance is too large or too low temperature of the liquid metal, it can not continue to flow to produce cold or lack of pouring.
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