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Casting is a kind of metal hot working technology mastered by human beings earlier, which has a history of about 6000 years. Casting is a kind of processing method that melts solid metal into liquid, pours it into the mold of specific shape, and then solidifies. The materials of valve mold are raw sand, clay, water glass, resin and other auxiliary materials. In the 20th century, the development of valve casting is very fast. One of the important factors is the progress of valve product technology, which requires better mechanical and physical properties and good machining performance; Another reason is that the development of the valve industry itself has created favorable material conditions for the foundry industry. The following talk about the valve casting process and cost comparison

The medium temperature wax investment casting is the shell making process of silica sol, while the low temperature wax is generally combined with the shell making process of sodium silicate! The shrinkage of medium temperature wax is larger than that of low temperature wax because there is water vapor in low temperature wax paste. And low temperature wax is generally used with water glass shell technology! The shrinkage of medium temperature wax is larger than that of low temperature wax because there is water vapor in low temperature wax paste. What is the difference between medium temperature wax investment casting and low temperature wax casting?

1. High temperature wax is combined with silica sol shell making process, while low temperature wax is generally combined with sodium silicate shell making process.

2. The shrinkage of high temperature wax is larger than that of low temperature wax because there is water vapor in low temperature wax paste.

3. The shrinkage of medium temperature wax is larger than that of low temperature wax because there is water vapor in low temperature wax paste.

4. The size of medium temperature wax is more stable than that of low temperature wax, and the price is more expensive.