Which Is More Suitable for Manufacturing Grate Bars, the Lost Foam Process or the Coated Sand Shell Casting Process?
Publish：
2025-05-26 15:41
发布人：
清水源
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As a key component of a high-temperature furnace, the grate bar needs to have heat resistance, deformation resistance and precise ventilation structure. Lost foam casting adopts the principle of foam mold vaporization molding. Although it can realize one-time molding of complex cavities, its gas residue is easy to form micropores inside the grate bar, reducing the structural stability under high temperature conditions. Actual tests show that after the chromium-nickel alloy grate bar using this process has been working continuously for 200 hours at 800℃, cracks have expanded in the parts with a porosity of 0.3%, affecting the service life.
Coated sand shell casting shows better adaptability. Its precision sand shell can accurately replicate the 0.8mm thin-walled structure of the grate bar heat dissipation fins under the cavity control accuracy of 0.2-0.5mm. The dense cavity formed by resin coating increases the fluidity of high chromium cast iron molten metal by 40%, and the surface roughness of the casting is stabilized within Ra12.5μm. Comparative data from a coking plant showed that after the coated sand process was used for the same material grate bars, the high-temperature creep rate was reduced by 57%, and the batch yield rate was increased from 83% to 96%.
Taking all factors into consideration, coated sand shell casting is superior in dimensional accuracy, material density and production stability, and is particularly suitable for the manufacture of castings such as grate bars that have both functional and durability requirements.
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