21
2023
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04
Deformation problem of coated sand core after mold removal
Question: May I ask if the coated sand core will deform due to different wall thicknesses at different locations after being removed from the core injection mold, resulting in different cooling rates at different locations? Is this possible? By the way, the sandblasting rod generated at the sandblasting hole is usually knocked off after taking out the mold. This can cause the surface of the sandblasting core to be rough, resulting in low surface strength. If the molten iron has a significant impact on this position, I think it is easy to sandblasting, leading to sand inclusion defects. How do you generally prevent this situation?
Answer: If taken out too early, it may deform or crack due to the resin not fully cured and still in a plastic state. So just ensure sufficient heating time. Whether the heating time is sufficient depends on the color of the core, whether it is "raw" or "cooked". This is not a matter of cooling rate. There is a difference between deformation and casting. For a hot core box, all sand cores will deform, depending on their structure and strength. The amount of deformation varies. Think about it, if the sand core drops from over 200 degrees to room temperature, it will shrink, and uneven shrinkage combined with insufficient strength will cause deformation; For example, the water jacket core, oil circuit core (thin), and the four integrated air passages of the cylinder head all have deformation, with the largest being 1-2mm, which can only be corrected with tooling during hot state.
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Douyin
Nantong Maylead Technology Co., Ltd.
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