asting is the injection of a liquid alloy into a mold to cool and solidify it to obtain the desired shape.
So for casting, there are two basic elements:
1. Qualified cavity - has a certain strength, can withstand the high temperature of liquid alloy; and can ensure that the
liquid alloy can fill the cavity.
2. The liquid alloy with suitable temperature and suitable temperature.
The casting process is generally: sand mixing - compacting - trimming - box - pouring (previously smelting molten iron -
gestation treatment) - falling sand - cleaning pouring riser - shot blasting - grinding burr - quality inspection - anti-
rust treatment - storage.
The water glass you mentioned is needed in the process of sand mixing. Generally, the more raw materials used for casting
are sand. The sand can not form a certain shape of the cavity. It needs to have a binder to make the sand between The role
of adhesion. Water glass is an inorganic chemical binder used in foundry production. Water glass is a generic term for
various polysilicate aqueous solutions, such as sodium water glass, potassium water glass, lithium water glass, etc. It is
sodium water glass. Sodium silicate is dissolved in water and becomes a viscous liquid, which is what we often call sodium
After the sand in the casting is finished, it can usually be recycled and reused. The water glass is a one-time
consumable, and the casting cost is relatively large.
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