Types of Moulding in Casting | RTO | GATE | Manufacturing Engineering

Types of Moulding

Hello Friends, In this post, I will discus about different types of moulding we use in casting. there are three types of moulding which shown bellow.

1. Green Sand Moulding
2. Dry  Sand Moulding
3. Carbon Dioxide Moulding

So let's start with one by one .........

Green Sand Moulding

• Green sand is the moulding sand which has been freshly prepared from silica grains, clay and moisture. In a green sand mould, metal is poured immediately and the casting taken out.
• Composition: 
• Sand: 70-80%
• Clay: 18-30%
• Water: 6-8%
• Additives: 1-5%

Dry Sand Moulding

• These are the green sand moulds which are completely dried by keeping in an oven. These moulds generally have higher strengths than green sand moulds and preferred because they are less likely to be damaged during handing.

Carbon Dioxide Moulding

• This method of moulding is widely used in making cores. The principle of working of the CO2 process is based on the fact that if CO2 gas is pass through a sand mix containing sodium silicate as the binder, immediate hardening of sand takes place as a result of the chemical action between sodium silicate and CO2 The bounding strength obtained by the hardening action is sufficient to eliminate the need for any drying of baking of the mould and the metal can be immediately poured. The chemical reactions taking place are of complex nature, through the main reaction can be represented in simplified.

👉 I hope you are understand very well about types of moulding. 

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