What is the grain size of ceramic foundry sand?
The particle size of coated ceramic sand determines the surface finish of sand core and core shell, and it also determines the surface finish of casting. Of course, if the particle size of the coated sand is too fine, the amount of resin added to achieve the same strength will increase, the amount of air generation will increase, and the possibility of producing pores in the casting will increase. Therefore, in the occasion where the casting surface is not required too high, select coarse raw sand, the sand core has good air permeability, low air generation, small air hole probability after pouring and easy sand removal. In some special occasions, such as the oil channel core of hydraulic parts, the air and oil channel core of automobile and motorcycle engines and other occasions with high surface finish requirements, fine sand shall be used as far as possible. In addition, in the occasion of pouring nonferrous heavy metals such as copper and copper alloy, in order to reduce the penetration of metal liquid to sand mold, the raw sand shall be as fine as possible. When pouring steel castings, the fine and dense surface can resist the high temperature of molten steel. It should be noted that it is not enough to improve the surface quality of castings only by selecting the particle size of the coated sand, but also by improving the finish of the mold, formulating a reasonable core making process, and using high-quality cast coating.
Fused ceramic sand has good air permeability
As a kind of artificial sand, fused ceramic sand has a wide particle size distribution, which is suitable for various casting processes and casting process requirements. When fine sand is used, it still has a high air permeability, which is conducive to improving the surface quality of castings. As for the grain size of coated sand of Fused ceramic sand, as for silicon sand, the raw sand of AFS 50-65 shall be adopted, and the sand shall be distributed through 4 sieves or 5 sieves. However, due to the performance advantages of perlite, finer perlite such as 100/200, 140/200 has also been successfully applied to small steel castings in recent years, especially when the surface quality of castings is close to that of precision castings.
Typical Application of Fused ceramic sand in Each Grain Size and Corresponding Casting Type
1. Self-hardening sand process
Large cast steel 30/50 mud core, hot spot area (basic phenolic)
50/100 Small and medium sized carbon steel parts, low alloy, high alloy steel parts and stainless steel parts (alkali phenolic resin)
Small and medium-sized nodular iron parts (furan resin)
50/100 Special aluminum alloy parts (furan resin)
2. Coated sand process
Stainless steel castings (castings such as valve bodies, pump bodies, etc., which require precision casting in the past)
Carbon steel, low alloy steel parts (accessories for mine machinery, bucket teeth and other wear-resistant parts)
Cylinder body, cylinder head and other automobiles, engineering vehicle accessories and mud core of damp sand process
3. Lost Foam Process 10/30
Advantages: good mobility, green and environmental protection, low sand consumption per ton of casting
Fused ceramic sand Premium Manufacturer
The main product of Sanmenxia Qiangxin Foundry Material Co., Ltd. is ceramic foundry sand, commonly known as "Fused ceramic sand", which is a new high-end artificial casting material. The company has established an advanced technical R&D mechanism for casting ceramic sand industry. According to the needs of the development of casting industrialization technology, it constantly expands advanced experimental equipment, research and development, and test simulation software, providing a more complete research and verification test platform for the key technical breakthrough and major new product development of the casting industry; Form an innovative team with industry leading level and reasonable structure, build a long-term effective industry-university-research cooperation mechanism and a flexible and efficient operation mechanism, achieve sustainable development, improve the core competitiveness of the casting industry, and provide strong support for the industrialization and technical progress of casting materials and the structural upgrading of casting materials.
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