How to control the moisture content of old sand during the precision casting process
During the investment casting process, it is very important to control the moisture content of old sand to ensure the quality and stability of castings. The following are some commonly used methods to control the moisture content of old sand:
1. Drying: Before using old sand, you can put it into a drying equipment and evaporate the moisture in it through heating and ventilation. This can effectively reduce the moisture content in the sand and improve the surface quality and quality of the casting. Size control.
2. Steam treatment: Use steam treatment equipment to process the old sand, and evaporate the water in the sand through steam heating. This method can quickly and uniformly control the water content of the sand, and is suitable for large-scale casting production.
3. Preheating: During the actual casting process, the old sand can be preheated before it is put into the mold. Preheating can be done by heating equipment or exposure to high temperature environments to help the moisture in the sand evaporate Lose.
4. Humidity control: In the precision casting workshop, maintaining appropriate humidity is the key to controlling the moisture content of the old sand. Use humidity sensors and humidification or dehumidification equipment to ensure that the humidity in the workshop is within the appropriate range to prevent the old sand from absorbing moisture or being too dry. .
5. Regular inspection and testing: Regularly conduct moisture content tests on the old sand to ensure that it meets the requirements. Some common testing methods can be used, such as the drying weight loss method or electronic moisture content tester, etc., to determine the moisture in the old sand. content.
These methods are usually combined with other parameters and control strategies of the precision casting process to achieve effective control of the moisture content of the old sand, thereby ensuring the production of high-quality precision castings.
