The cooling rate of a furnace during lost wax casting can vary depending on the size of the furnace, the number and size of the flasks, and the type of material being cast. Generally, it is recommended to cool the flasks down slowly to prevent thermal shock and cracking.
When reducing the furnace temperature from burnout temperature to casting temperature, it is recommended to reduce the temperature gradually, around 50-100°C per hour, to avoid thermal shock. This process can take several hours, depending on the size of the furnace and the number and size of the flasks.
Leaving the furnace door open during the cooling process can help to speed up the cooling process, but it can also lead to temperature fluctuations and uneven cooling, which can result in cracking. It is generally not recommended to leave the furnace door open for extended periods of time during the cooling process.
If you need to speed up the cooling process, you can try using a fan to circulate air around the flasks or placing the flasks in a cooler area. However, it is important to monitor the temperature of the flasks closely to ensure that they are cooling at a safe rate and not experiencing thermal shock.
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