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The use of graphite powder in casting


 The use of graphite powder in casting

Casting can be divided into the precision casting and the common casting, in accordance with the requirements, by casting surface is generally cast for non-ferrous metals copper, iron, aluminum, tin, lead, etc., is refers to the metal smelting, casting manufacturing mold, and poured the molten metal into the mold, has a certain shape, size and performance after the solidification of metal parts forming method of blank.Casting is a process in which metal is smelted into a required liquid and poured into the mold. After cooling, solidification and cleaning, a predetermined shape, size and performance of the casting is obtained.Because the casting blank is almost formed, the cost is reduced and the time is reduced to some extent.Casting is one of the basic processes in the modern device manufacturing industry.

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Casting is one of the earliest metal thermal processing technology, which has a history of about 6000 years.China had entered the heyday of bronze casting about 1700 ~ 1000 BC, and the technology had reached a high level.Casting is a process in which a solid metal is dissolved into a liquid state and poured into a cast of a particular shape to be solidified.Cast metal: copper, iron, aluminum, tin, lead, etc., the ordinary casting materials are raw sand, clay, water glass, resin and other auxiliary materials.The casting types of special casting include investment casting, lost mold casting, metal mold casting, ceramic mold casting, etc.(the original sand includes: quartz sand, magnesia sand, zirconium sand, chromite sand, magnesium olivine sand, blue crystal sand, graphite sand, iron sand, etc.)

The graphite powder coating on the surface of the solid, can form a smooth film adhesion strong, this is the appearance of graphite good coating performance, it is a good casting remover casting commonly used graphite powder have crystalline graphite powder (flake graphite powder) or aphanitic graphite powder (earthy graphite powder, also known as microcrystalline toner, black lead powder).Up to now, there are many small township factories that produce thin-wall small pieces by hand modeling without adding coal powder in molding sand, but brush soil-like graphite powder to wet sand surface with soft brush, casting surface is quite smooth.Although graphite powder does not form bright carbon when pouring iron liquid, the wetting Angle of graphite to iron liquid is much greater than 90°, that is, the sand model is not wetted by iron liquid.Moreover, the pores on the surface are blocked by earth-stone toner, and the iron liquid is not easy to penetrate and drill into the sand, which can prevent the casting from adhering to sand and improve the smoothness of the casting surface.Graphite powder has good lubrication effect, which can improve the compactness and fluidity of molding sand, decrease the permeability, reduce the ejection resistance of samples, and improve the molding performance of molding sand.

The foundry graphite powder produced by Henan Star metallurgy material co. LTD has the following specifications: 100 mesh, 200 mesh, 325 mesh, 800 mesh, 1200 mesh, 2000 mesh, 4000 mesh, 5000 mesh, 8000 mesh, 15000 mesh, etc.