How to ensure the quality of casting sand
In the process of casting at high temperature, due to the thermal expansion of molding sand, it is very easy to cause minor changes in the size of molding sand, which will affect the dimensional accuracy of castings and the appearance and performance of castings. At the same time, excessive thermal expansion coefficient of molding sand will cause casting defects such as sand inclusion, scab, rat tail, etc. All these factors make foundry enterprises more cautious in selecting molding sand, not only considering the thermal expansion coefficient of molding sand, but also taking into account the cost of molding sand.
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