In this method the sand molding mixture is hardened by blowing gas over the mold. This process is favored by hobby metal casters because a lot of cost cutting can be done.
In addition may be sure of getting dimensionally accurate castings with fine surface finish. However this method isn’t economical.
The Mold for CO2 Casting is made of a combination of sand and liquid silicate binder that is hardened by passing CO2 gas over the mold.
The equipments used are CO2 cylinder, regulator, hoses and nozzle.
Any existing pattern may be used for the molding purpose which can be placed in the mold before the mold is hardened.
This method helps in producing strong mold and cores that may be used for high end applications. If the process is carefully executed then casting can be as precise as produced by the shell casting method.
CO2 casting is favored both by the commercial foundry men and hobbyist for a number of reasons.
In industrial operations foundry men can assure customers of cheap castings that need less machining.
The molding process that can be fully automated is generally used for casting process that need speed, high production runs and flexibility.
This is one of the simplest process that improves the casting quality.
ADVANTAGES :
Compared to different casting methods cores and molds are strong.
Reduces fuel price since gas is employed rather than of to different costly heating generating parts.
Reduces massive requirement for number of mold boxes and core dryers.
Provides great dimensional tolerance and accuracy.
Moisture is completely eliminated from the molding sand.
Fully automated process.
APPLICATIONS:
Molds and cores of a varied sizes and shapes can be molded by this process.
CO2 casting process is ideal where speed and flexibility is the prime requirement.
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