Optimum design of sand casting chill

The sand cast chill is directly attached to the area where the riser should not be placed. In this way, due to the chilling effect of the chill, the solidification speed of the sand cast axle housing where the chill is placed is faster than that of the adjacent section. Therefore, a “V” shaped solidification front is formed on this section. The temperature difference formed in this way is equal to the temperature difference formed in the natural end area, which is conducive to the formation of sequential solidification. It is conducive to the formation of compactness of sand casting axle housing. The casting system adopts cast steel as cold iron, and the size of sand cast cold iron is about 30mm × 50mm × 60mm, derusting and grinding are required, there is no oxide layer, and it can be reused for many times.

According to the results of ProCAST simulation software, shrinkage defects are easy to form at the lower part of the inner cavity of the sand cast axle housing, as shown in Figure 1 below. The riser cannot be added here, so the cold iron is added here to form an artificial temperature difference. The sand cast axle housing near the cold iron is solidified first, so as to achieve the purpose of sequential solidification of the axle housing and eliminate the shrinkage porosity and shrinkage defects here.

The yellow block is cold iron, and the red block is riser

Creo 3D drawing software is used to re model the axle housing with riser and chill. The 3D structure diagram of sand casting axle housing with riser and chill in scheme I is shown in Figure 2, and the structure diagram of sand casting axle housing with riser and chill in scheme III is shown in Figure 3.

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