Application of Fused Ceramic sand in foundry
At present, the majority of domestic casting production is sand casting, while Fused Ceramic sand has advantages in sand casting, such as less binder, high fire resistance and good regeneration performance; It also has great advantages in special casting (lost foam casting, V-process casting, etc.) - it is not easy to break and has good reusability. Figure 3 shows the application process distribution of Fused Ceramic sand according to the actual application of customers.
Molding and core making in coated sand process
China began to research and apply the coated sand and shell mold (core) process in the 1950s. Since the 1990s, the production and application of coated sand have developed rapidly, and the variety of products has been increasing, and has formed a series. This is mainly due to the good fluidity and storage of coated sand. The sand core made with it has high strength, high dimensional accuracy and is convenient for long-term storage.
Sand core of the engine water jacket. The local sand core has small cross-sectional area and complex shape. If silicon sand coated sand is used, it is not easy to be shot and broken, and the casting is also easy to stick sand and difficult to clean. Fused Ceramic sand coated sand is not only easy to be shot, but also has high core strength. The casting surface is smooth and tidy, reducing the amount of cleaning by workers.
In recent years, the application of Fused Ceramic sand shell mold precision casting technology has developed rapidly, and the surface quality of the castings produced by it is close to that of the traditional wax loss precision casting. Stainless steel tee joint, produced by Fused Ceramic sand shell mold precision casting process, not only has short production cycle and high efficiency, but also its production environment has been greatly improved, and good economic and social benefits have been achieved.
Molding and core making in resin self-hardening sand process
Studies have shown that the strength of resin self-hardening sand increases with the increase of resin content, but the strength increases slowly at a certain amount. For foundry plants, the increase of resin consumption will also significantly increase the production cost, and will increase the residual alkali in resin sand and the carbonaceous coating on the sand surface, affecting or even deteriorating the quality and strength of recycled sand, and then affecting the regeneration rate of used sand. In order to reduce the production cost of enterprises, under the condition of meeting the production needs, the less the amount of resin, the better.
Comparison of tensile strength between basic phenolic resin Fused Ceramic sand and standard sand. Compared with the standard sand, the 2H tensile strength increases by 14% and the final strength increases by 24% when the resin content is reduced by 50%. It can be expected that the resin content in Fused Ceramic sand can be reduced by 45 ~ 60% when the strength required for production is reached.