Baozhu sand factory direct 20-40

Features 1. dense spherical particle shape: spherical grain shape, smooth surface and a surface area of ??small, excellent fluidity and filling. Therefore, in the mold to obtain good strength and high permeability, while compared with other sand can significantly reduce the amount of the binder used. It also has excellent collapsibility. 2. The low thermal expansion: thermal expansion coefficient than other foundry sand. Therefore, production of high precision casting size, small cracks and defects, the casting yield. 3. Good resistance to crushing: Volume Baozhu sand dense, high strength, repeated use of renewable rarely broken, sharp sand to improve reclamation and reuse rate and reduce the waste sand emissions and environmentally friendly. 4. refractoriness High: The main ingredient is aluminum oxide, PH value neutral, belong to Al-Si refractory materials, good fire resistance, to meet the requirements of various metals and alloys. ? ※ Sarah performance advantages compared to sand and silica sand has the following advantages: 1, Sarah sand refractoriness higher than silica sand, high and tight shape when filled, therefore, can improve the surface quality of the casting, production scrap rates reduced; 2, spherical orb sand good liquidity, complex shape castings, internal angle, deep recesses, holes and other difficult to fill flat parts, are easy to fill tight. Thus, these parts can significantly reduce packet sand defect greatly reduce the workload of cleaning and finishing; 3, good resistance to crushing, high recovery, waste emissions are correspondingly reduced; 4, thermal expansion coefficient is small, good thermal stability, which leads to swelling defect secondary phase transition does not occur, greatly improving the dimensional accuracy of the Pearl of sand, although the price is higher than a lot of sand, such as used properly, comprehensive accounting down, not only can significantly improve the quality of casting, but also lower production costs; 5, Baozhu sand grain shape is spherical, the contact surface of the contact point, to achieve the same resin less strength you need, thereby greatly reducing the cost of production. ? ※ Baozhu sand and chromite sand compared to the following advantages: 1, a bulk density of less than chromite sand, reduce the cost of high-quality sand 2, mimicking spherical grain type, use less adhesive 3, anti-broken good, increase the recovery rate and good regeneration properties 4, chromite sand chromium and its compounds can cause heavy metal pollution, environmental pollution Baozhu sand, are environmentally ※? Baozhu sand and zircon sand compared to exist the following advantages: 1, Sarah mimicking spherical sand type, use less adhesive 2, with respect to resource shortages expensive zircon sand, its raw materials stocked, low price. 3, its resistance to breakage resistance, high recovery rate, can be recycled, which saves zircon sand while protecting the environment, avoiding the radioactive zircon sand to front-line workers hurt Applications Ⅰ V- method for casting and Lost Foam Casting V -???? method of casting all with dry sand molding, casting most of them have disappeared dry sand molding. Such as the use of silica sand, sand off the process for distributing a lot of silicon dust, bad working conditions, which is a serious problem. Sarah instead of silica sand with sand, can significantly reduce the dissemination of dust, dust and silica dust contained little to improve working conditions and protect the environment is significant. In addition, there are the following benefits: 1. Sarah sand refractoriness higher than silica sand, high and tight shape when filled, therefore, can improve the surface quality of the casting, production scrap rates reduced; 2, spherical Sarah sand good liquidity, complex shape castings, internal angle, deep recesses, holes and other difficult to fill flat parts, are easy to fill tight. Thus, the package can significantly reduce defects in these parts of sand, greatly reduce the workload of cleaning and finishing; 3, sand casting consumption per ton can be reduced by 90 percent, waste emissions are correspondingly reduced; 4, EPC when using resin bonded sand molding, the amount of resin can be reduced by 1/3. Although the price is higher than the sand Baozhu sand lot, such as used properly, comprehensive accounting down, not only can significantly improve the quality of casting, but also reduce production costs. Baozhu sand low coefficient of thermal expansion is an important advantage to prevent casting defects produce expansion, but this feature also has some negative effects. After its expansion due to heat is much lower than that of silica sand, the production of iron castings, ductile iron castings especially when, casting graphite mold restrict the expansion of the role of the poor, and thus easy to produce shrink casting defects, should be properly set up the riser.