One, water glass shell

This process has been produced in China for nearly 50 years. After half a century of unremitting efforts by colleagues in the precision casting industry, the application and research of water glass shell technology has reached a high level. Over the years, the strength of the water glass shell has doubled due to the improvement of refractory materials for the back shell and the popularization and application of new hardeners. Low cost, shortest production cycle, excellent shelling performance and high air permeability are still the advantages of any other shelling technology.

2. Composite shell

Compared with the water glass shell, the surface quality of the casting has been greatly improved, and the surface roughness, surface defects and repair rate have been reduced. Suitable for high alloy steel such as stainless steel and heat-resistant steel. The production cycle is much shorter than the low-temperature wax silica sol shell, which is similar to the water glass shell.

3. Silica sol (low temperature wax) shell

This process is in line with national conditions, and has great adaptability and superiority when casting large and medium-sized castings of 1kg or more, especially large and medium-sized castings of 5kg or more. Compared with the composite shell, the shell quality is stable, especially the casting has high dimensional accuracy, no sodium silicate, good high temperature performance, and has higher air permeability and creep resistance after baking at 1000-1200℃, which can be applied Thin-walled pieces. LED parts, small and medium-sized parts with complex structures, and large parts with a weight of 50-100kg, such as water pumps, impellers, etc., can also be produced. Guide shell, pump body, ball valve body, valve plate, etc. For thin-walled small, medium or large parts, fork shells or lifting shells can be poured directly in front of the furnace to obtain a higher yield.

4. Silica sol (medium temperature wax) shell

This is the universal production process for precision castings in the world. It has the best casting quality and the best repair rate. Especially suitable for small and medium-sized castings (2-1000g) with high surface roughness and high dimensional accuracy. However, due to equipment and cost constraints, it is rarely used for large and medium-sized parts (5-100kg).