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Causes of insufficient pouring of copper castings

Update:05 Jul 2019
Summary:

Insufficient copper casting is an incomplete casting fo […]

Insufficient copper casting is an incomplete casting formed by the failure of the molten metal to fill the cavity of the mold. It is a common defect in the casting. This situation may lead to unclear contours of the casting and defects in corners. It exists in every process of casting, and the specific reasons for formation are as follows:

1 The casting temperature of the metal is too low, and the casting is too slow so that the metal in the mold is too cold to fill the mold.

2 Due to harmful impurities in metals (such as sulfur in cast iron), dissolved gases and non-metallic residues (such as alumina in steel) increase, resulting in insufficient metal flow

3 The size of the gating system is incorrect or damaged (blocking), causing the molten metal to flow into the cavity unimpeded

4 The amount of metal in the bag for pouring is insufficient or the flow of metal is interrupted during pouring.

5 The mold is leaking and cannot be blocked in a short time, resulting in a defect.

6 When the individual parts of the mold move (such as when the wrong box) or the mold is incorrect, the thickness of the casting wall becomes smaller, so that the molten metal does not flow.

7 When the metal type is used, the preheating temperature is insufficient, causing the metal in the metal, especially the runner, to be too cold.

In addition, in the casting process, if there is a power outage or equipment failure, the casting is interrupted, which will also cause insufficient pouring. At this time, the manufacturer needs to regularly check and maintain the equipment.