Method for controlling solidification and cooling of heavy castings

Abstract

A method for controlling solidification and cooling of heavy castings improves a traditional chilling block, and a cooling channel is arranged inside the chilling block. A flowing cooling medium is led to the cooling channel inside the chilling block after the heavy castings are poured, so that cooling capacity of the chilling block cannot achieve saturation, and the chilling block can continuously have cooling effects. If the cooling medium is led to the cooling channel inside the chilling block, the hollow chilling block hinders heat of the castings from delivering from the chilling block to outside due to air-isolation effects. The method changes effects of the traditional chilling block, enables the chilling block to serve as a carrier for heat transferring and cooling, enables the cooling medium to continuously and indirectly cool the heavy castings, can quicken solidification and cooling of partial areas, better achieves progressive solidification, and improves feeding of the castings. After the heavy castings are solidified, the cooling capacity of the chilling block in different time can be adjusted by controlling the flow of the cooling medium, cooling with the castings is evenly quickened, and residual stress of the castings is reduced. The method is simple in chilling block manufacture, simple and convenient in operation and low in cost.

Description

technical field [0001] The invention belongs to the field of casting, in particular to controlling the solidification and cooling of large castings. Background technique [0002] Large castings are one of the most important blanks for heavy equipment, and their production capacity is a reflection of the country's comprehensive industrial strength. The weight of large castings reaches several tons, tens of tons, or even hundreds of tons. Large castings solidify and cool very slowly during the casting process, especially the sand casting process. In order to ensure the strength of the sand mold, large castings need a large amount of sand. The heat of the casting needs to pass through the thick sand mold to the surface of the sand box, and then exchange heat with the air. The surface temperature of the sand box starts to rise after several or even dozens of hours after the pouring of large castings, and the surface temperature only rises by tens of degrees. Due to the slow ...

AI Technical Summary

Problems solved by technology

Someone proposed blowing air or spraying water on the surface of the casting sand box, which can only play a role in the cooling of the casting later, but it is difficult to ensure the balanced cooling of the casting

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