Analysis of the causes of white spots on castings in aluminum alloy die-casting plants.extruded aluminum frame system

　　In general, white spots appear at the connection between the inner sprue and the casting, the connection between the inner sprue of the gating system, the upper part of the sprue, and the connection between the sprue cup. There are several reasons for the appearance of white spots. Firstly, improper operation. Improper handling of the connection between the internal sprue and the casting, the connection between the internal sprue of the pouring system, and the connection between the vertical sprue and the sprue cup resulted in incomplete bonding. 2、 The coating layer, due to the uneven thickness of the surface coating layer and the strong suction of the vacuum pump, causes sand leakage at the crack area. 3、 Adhesive, if the quality of the adhesive is poor, especially if the high temperature bonding force is insufficient, it can cause differentiation and decomposition, sand leakage at the bonding area, and other results. Sand particles may adhere to the surface of the casting under high temperature baking, and in severe cases, it may cause sand scars.

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