Cooling device for overcoming shrinkage porosity defect of casting and cooling method of vertical casting

Abstract

The invention relates to a cooling device for overcoming the shrinkage porosity defect of a casting, the cooling device comprises one or more layers of cooling delivery pipes, the cooling delivery pipes are provided with blowing nozzles, the blowing nozzles are provided with corresponding control switches, the outlets of the blowing nozzles directly face the post-solidification part of the vertical casting, and the nozzles are provided with corresponding control switches. And a distance is formed between the blowing nozzle and the casting, and the interval is filled with molding sand. The method is particularly suitable for casting of special-shaped castings of vertical structures with the lower portion larger than the upper portion in size. According to the cooling device, the conveying pipe of the cooling medium and the blowing spray head are arranged at the large-volume, namely post-solidification part of the corresponding casting, and the specific part in the casting process is cooled by blowing the cooling medium, so that the whole casting with a vertical structure is solidified in a stepped manner from bottom to top in a solidification sequence; the molten metal in the upper riser can be supplemented in time in the casting process, shrinkage cavities cannot be generated, and the casting quality is ensured.

Description

technical field [0001] The invention relates to the technical field of casting tools, in particular to a cooling device and a vertical casting cooling method for solving casting shrinkage defects. Background technique [0002] In the field of casting material molding, the high-temperature liquid pouring, cooling and solidification molding process is relatively simple, and it is widely used in the production of various castings. However, during the casting process, the liquid metal is cooled and solidified in the mold, and the mold will shrink and solidify under the conditions provided by the material itself and the casting process. However, many castings cannot pass the conventional process due to structural reasons. Way to achieve controllable solid without shrinkage. For example, some special-shaped castings with uneven wall thickness, castings with a three-dimensional structure and a large lower part, etc., due to their irregular shapes, the volume of the casting cavity ...

AI Technical Summary

Problems solved by technology

However, during the casting process, the liquid metal is cooled and solidified in the mold, and the mold will shrink and solidify under the conditions provided by the material itself and the casting process. However, many castings cannot pass the conventional process due to structural reasons. way to achieve controllable solidification without shrinkage

For example, some special-shaped castings with uneven wall thickness, castings with a three-dimensional structure and a large lower part, etc., due to their irregular shapes, the volume of the casting cavity is different, and the solidification time of each part will also vary, resulting in some castings. Parts are not replenished and shrinkage defects appear, which affects the quality of castings

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