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Knowledge - the characteristics of four shell making processes for precision casting
Water glass shell
This process has a history of nearly 50 years in China. After half a century of unremitting efforts of colleagues in the Precision casting industry, the application and research of the water-glass shell process has reached a high level.Over the years, the strength of the water glass shell has doubled due to the improvement of the back layer shell refractory and the application of the new type of hardener.Low cost, shortest production cycle, excellent peeling performance and high permeability are still the advantages of any other shell technology.
2 composite shell
Compared with the water glass shell, the surface quality of the castings is greatly improved, the surface roughness is reduced, the surface defects are reduced and the repair rate is reduced.It can be used in stainless steel, heat - resistant steel and other high alloy steel.The production cycle is much shorter than that of low-temperature wax-silica sol shell, which is similar to that of water glass shell.
Silica sol (low temperature wax) - shaped shell
This process is in line with the national conditions, and it has greater adaptability and advantages in casting over 1kg, especially for large and medium castings over 5kg.Than composite shell stable quality, especially the casting dimension accuracy is high, because it has no water exists, the shell of high temperature performance is good, in 1000-1200 ℃ after roasting shell permeability is high, creep resistant capability is strong, can be suitable for thin-walled parts, complex structure of medium and small parts, and can produce weighing up to 50-100 kg of parts, such as water pump, impeller and diversion shell, the pump body, valve body, valve plate, etc.For small and medium sized pieces or large pieces of thin wall, the forked shell or lifting shell can be used to directly pour in front of the furnace, and high yield can be obtained.
4 silica sol (medium temperature wax) - shaped shell
This is a common production process of precision castings in the world. It has the highest casting quality and the lowest repair rate. It is especially suitable for small and medium sized parts with high surface roughness and high dimensional accuracy (2-1000g).However, due to the limitation of equipment and cost, it is less applied to medium and large parts (5-100kg).