The water glass shell workshop is humidified, which can effectively reduce dust and improve precision

　　In my country, modern precision casting technology is mainly based on lost foam casting, which requires shell making. At present, the shell-making technologies adopted at home and abroad mainly include water glass shell, composite material shell and silica sol shell. Silica sol shells are divided into low temperature wax shells and medium temperature wax shells according to the temperature of the binder wax used. Among the three shell-making processes, water glass shell-making is commonly used in my country. This process has been used in my country for a long time and is developing rapidly. Many small and medium foundries use this process.

　　With the improvement of the bottom refractory material and the popularization and application of the new hardener, the strength of the water glass shell has been doubled, and the surface quality, dimensional accuracy and yield of the casting have been greatly improved. Low cost, short cycle times, excellent peel properties and high breathability remain the same as any other shell technology. But don't think that this process has no shortcomings. On the contrary, because many small foundries in my country use this process, the products with defects are higher than the other two processes.

　　There are two reasons. One is water glass adhesive. Due to the high content of sodium oxide in water glass, the high temperature strength and creep resistance of this type of shell are much lower than those of silicon solvent-based shells. In addition, in order to reduce production costs, small foundries use low-cost, low-quality surface refractory materials and quartz sand (powder) with poor particle size gradation, so the quality of the castings produced will not be very high, and they are almost used for public products. Likewise, some units that require high precision casting will not be produced using this process.

　　Secondly, the shell production environment is very poor. No foundry will establish a shell production-oriented dust-free workshop with constant temperature and humidity. Humidity and moisture regain have a great impact on the shell. , floating sand buckets, cutting machines, such as powerful sandblasting machines, are prone to generate a lot of dust during operation. If these dusts are not processed, they will affect the assembly of the shell, so they will be scrapped in batches in high temperature, low temperature or the rainy season. quality accident.

　　Dust not only affects the production of shells, but also has a great impact on the health of workers. Even if the air is dry, too much dust can present a huge safety hazard. Once a dust explosion occurs, it is a huge production safety accident. Many foundries are still manual workshops, and it is impossible to establish a constant temperature and humidity workshop to produce plastic casings, but there are other ways to deal with the impact of dust on plastic casings.

　　This is using a humidifier to increase the air humidity. As long as the air humidity is controlled at about 60%, it can effectively play the role of dust removal. Because the dust will absorb the water vapor in the air, it will settle to the ground, so the impact of the dust on the production of the shell will be reduced, and the production of castings will be reduced. will not be affected.

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