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1.A foam pattern (see images above) is made using expanded Polystyrene (2.5% Polystyrene, 97.5% air). This can be formed by closed-die moulding, machining or assembly from multiple parts. Risers and gates are included at this stage.
Shell mould casting is one technology of casting. Products are casted from thin cast shells directly. Materials include carbon steel, alloy steel, etc. can all be casted in shell mould casting process.
Both cast iron and cast steel are the important materials used for castings in china. But the castablility of cast iron is better than cast steel. There're some reasons which cause the difference.
Investment casting is mainly made up of mold making,wax pattern production,shell making and other processes.Wax pattern is the shape that wax injected into the cavity of mold.To obtain investment casting parts with high size accuracy and surface finish,wax pattern itself should have high size accuracy and surface finish.So it is very important to make high quality wax patterns.Now we would like to discuss the factors that affect the quality of wax patterns.
Due to the low percentage of carbon(C), the carbon equivalent is low. Thus, the low carbon steel castings are good for welding with other steel castings. But due to the low percentage of carbon(C), the machining property of the low carbon steel castings are not good. Usually, we need to normalize the low carbon steel castings and make it easy for machining.
Low carbon steel casting is one of the important investment casting production line in China. Low carbon steel, also called mild steel, is a kind of steel with percentage of carbon(C)≤0.25%. Strength of low carbon steel is soft and hardness is low. So, low carbon steel is also named soft steel. Castings made from low carbon steel are also with same characteristics as the low carbon steel.
