A High Performance Butterfly Valve Casting

Abstract

The invention discloses a high-performance butterfly valve casting. The high-performance butterfly valve casting comprises an upper sand box (1) and a lower sand box (2), wherein an upper cavity (3) is formed in the upper sand box (1); an upper core (4) is arranged in the middle of the upper cavity (3); an upper annular groove core (5) is arranged on the inner wall of the upper cavity (3); upper pipe opening cavities (6) are formed in two ends of the upper annular groove core (5); an upper shaft hole core (7) is arranged in each upper pipe opening cavity (6); a lower cavity (8) is formed in the lower sand box (2); a lower core (9) is arranged in the middle of the lower cavity (8); a lower annular groove core (10) is arranged on the inner wall of the lower cavity (8); lower pipe opening cavities (11) are formed in two ends of the lower annular groove core (10); a lower shaft hole core (12) is arranged in each lower pipe opening cavity (11); and a riser feeding cavity (13) is formed in the upper end of the upper cavity (3). The high-performance butterfly valve casting has the characteristics of compact structure of the casting, good overall quality of the casting and high yield of the finished product.

Description

technical field [0001] The invention relates to a butterfly valve casting mold, in particular to a high-performance butterfly valve casting. Background technique [0002] For large-scale butterfly valves, manufacturers usually use sand casting to cast them. In the selection of the parting surface of the butterfly valve sand box, the horizontal parting surface is used, that is, the shape of the circular nozzle is not destroyed. The advantage of this method is that the type is simple and the casting is easy; however, due to the cast ductile iron, its characteristic is that it will undergo secondary expansion during the casting process, the shrinkage process is from bottom to top, and the cooling process is from low to high. This leads to surface porosity in the upper casting area. Secondary production is required for rough castings, so that the upper loose surface will destroy its structure during secondary processing, resulting in casting failure. Therefore, the existing te...

AI Technical Summary

Problems solved by technology

[0002] For large-scale butterfly valves, manufacturers usually use sand casting to cast them. In the selection of the parting surface of the butterfly valve sand box, the horizontal parting surface is used, that is, the shape of the circular nozzle is not destroyed. The advantage of this method is that the type is simple and the casting is easy; however, due to the cast ductile iron, its characteristic is that it will undergo secondary expansion during the casting process, the shrinkage process is from bottom to top, and the cooling process is from low to high. This results in loose surfaces in the upper casting area

Secondary production is required for rough castings, so that the upper loose surface will destroy its structure during secondary processing, resulting in casting failure

Therefore, the existing technology has problems such as loose structure on the upper surface of the casting, poor overall quality of the casting, and low product qualification rate.

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