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Lost Foam casting is, in terms of casting processes, a relatively recent innovation that exhibits characteristics of both Investment casting and Sand Casting. It is a form of evaporative pattern casting where the pattern is of foam rather than wax. The foam pattern is covered in refractory material, as in investment casting, but the ‘shell’ is then surrounded by compacted un-bonded sand to give it strength. When molten metal is poured into the shell the foam pattern vaporises on contact. The result is a process that delivers the quality and accuracy of investment casting with the lower costs and greater flexibility of sand casting.
Tongda foundry has the ability and skills to deliver investment castings for oil and gas industry.We have been supplying quality investment castings to the oil and gas industry for more than 30 years.As these investment castings are used in high temperature and high working power,so they encounter hard working conditions(water,mud,crude,ect).
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.
