High-performance gate valve casting

Abstract

The invention discloses a high-performance gate valve casting. The high-performance gate valve casting comprises an upper sand box (1) and a lower sand box (2); molding cavities (3) are symmetrically arranged in the upper sand box (1) and the lower sand box (2); molding cores (4) are arranged in the molding cavities (3); the molding cavities (3) include gate plate groove molding cavities (31); pipe port molding cavities (32) are formed in one ends of the gate plate groove molding cavities (31); rib molding cavities (33) are formed in the gate plate groove molding cavities (31); the molding cores (4) include pipe port molding cores (41) with semicylindrical structures, and gate plate groove molding cores (42) arranged in the gate plate groove molding cavities (31); groove molding cores (43) with square section structures are respectively arranged on the front and back two sides of the gate plate groove molding cores (42); and riser feed molding cavities (5) are formed in the upper ends of the rib molding cavities (33) arranged in the upper sand box (1). The high-performance gate valve casting has the characteristics of compact surface structures of gate valve finished products, improvement of the yield of the gate valve finished products, reduction of the production cost and improvement of the production efficiency.

Description

technical field [0001] The invention relates to a gate valve, in particular to a high-performance gate valve casting. Background technique [0002] The structure of the large-diameter gate valve is relatively complex, and its thickness distribution is uneven. The casting process design is carried out by using the current upper and lower sand boxes. Solidification and shrinkage from bottom to top, due to the characteristics of ductile iron, will cause the uppermost part and the thick hot junction part of the product to be looser than the surface, and the structure will not be tight. The gate valve castings need to be precision-machined after casting. Bolts, bearings, insert holes, etc. are processed inside the surface of the gate valve, so that the loose ones are extremely easy to damage, making the gate valve unusable and requiring re-casting, reducing the cost. The qualified rate has been improved, the production cost has been increased, and the production efficiency has b...

AI Technical Summary

Problems solved by technology

[0002] The structure of the large-diameter gate valve is relatively complex, and its thickness distribution is uneven. The casting process design is carried out by using the current upper and lower sand boxes. Solidify and shrink from bottom to top. Due to the characteristics of ductile iron, the uppermost part and the thick hot junction part of the product will be looser than the surface and the structure will not be tight.

The gate valve castings need to be precision-machined after casting. Bolts, bearings, insert holes, etc. are processed inside the surface of the gate valve, so that the loose ones are extremely easy to damage, making the gate valve unusable and requiring re-casting, reducing the cost. The pass rate is increased, the production cost is increased, and the production efficiency is reduced

Therefore, the existing technology has problems such as loose structure inside and near the surface of the product, low product qualification rate, high production cost and low production efficiency.

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