Pure copper conductor casting sand mold for transformer

Abstract

The invention relates to the field of pure copper conductor casting, in particular to a pure copper conductor casting sand mold for transformers, including a sand box, a riser, a sprue and a mold core, characterized in that the sand box is divided into an upper box and a middle box And the lower box, the top of the casting opening is placed upwards and the riser is set, the main runner is set on the side parallel to the casting, and the ring-shaped secondary runners are respectively set on the two parting surfaces; the inside of the core is a T-shaped double layer Steel plate frame structure, several through holes are drilled on the steel plate, the core is erected on the upper box by two positioning rods, and suspended in the middle of the cavity. Coke and molding sand are sequentially wrapped on the outside of the core. Compared with the prior art, the beneficial effects of the present invention are: the hollow structure has good exhaust performance; the core is fixed delicately, which ensures the uniform wall thickness of the casting; the impact of the copper liquid on the cavity is reduced, and the defect of slag inclusion is reduced; The core is made of steel plate, coke, and sand multi-layer materials; it can realize the sequential solidification of castings, ensure the quality of castings, and greatly increase the yield.

Description

technical field [0001] The invention relates to the field of pure copper conductor casting, in particular to a pure copper conductor casting sand mold used for transformers. Background technique [0002] The large copper conductor used in the transformer is a pure copper casting, its structure is shown in the attached figure 1 And attached figure 2 , its structure is characterized by a large volume and a large cavity inside, and a small opening on the upper part. The difficulty of casting is that it is difficult to set the core inside and the sand core is difficult to fix. If the casting process is improper, it will easily lead to castings The gas in the internal sand core cannot be eliminated, and the molten copper impacts the sand core too violently, resulting in defects such as sand inclusions and slag inclusions on the outer wall of the casting, and defects in the inner and outer walls of the casting that are not concentric, and conventional sand molds cannot achieve s...

AI Technical Summary

Problems solved by technology

[0002] The large copper conductor used in the transformer is a pure copper casting, its structure is shown in the attached figure 1 And attached figure 2 , its structure is characterized by a large volume and a large cavity inside, and a small opening on the upper part. The difficulty of casting is that it is difficult to set the core inside and the sand core is difficult to fix. If the casting process is improper, it will easily lead to castings The gas in the internal sand core cannot be eliminated, and the molten copper impacts the sand core too violently, resulting in defects such as sand inclusions and slag inclusions on the outer wall of the casting, and defects in the inner and outer walls of the casting that are not concentric, and conventional sand molds cannot achieve sequential solidification, resulting in a series of serious casting problems. defect, insurmountable

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