High-precision butterfly plate casting

Abstract

The invention discloses a high-precision butterfly plate casting. The high-precision butterfly plate casting comprises an upper moulding box (1) and a lower moulding box (2), wherein a butterfly plate upper cavity (3) is formed in the upper moulding box (1); an upper core (4) is arranged in the butterfly plate upper cavity (3); a group of technological supports (5) made of an iron material are arranged between the upper core (4) and the butterfly plate upper cavity (3); a butterfly plate lower cavity (6) is formed in the lower moulding box (2); a lower core (7) is arranged in the butterfly plate lower cavity (6) and comprises a first core (71); axle hole cores (72) are arranged at two sides of the first core (71) and positioned below and connected with the first core (71); and second cores (73) are arranged at the upper ends and the lower ends of the axle hole cores (72). The high-precision butterfly plate casting has the characteristics that the manufacturing precision and the qualification rate are high, the production cost is low, the sealing effect is improved, and the damage probability of a butterfly plate is reduced.

Description

technical field [0001] The invention relates to a butterfly plate mold, in particular to a high-precision butterfly plate casting. Background technique [0002] During the use of the butterfly valve, the disc plate is needed to control the water flow. Due to the high water pressure on the disc plate, there are high requirements for the strength and precision of the disc plate. At present, in the production process of disc plates, in order to improve the strength, hollow structures are generally adopted. During the production process of disc plates with hollow structures, molten iron will impact the cores in the upper and lower sand boxes, so that the cores will be deflected. This makes it difficult to control the wall thickness of the disc, which reduces the qualified rate of the product, increases the difficulty of casting the product, and increases the production cost; at the same time, the shaft holes of the existing disc are all set at the same location as the disc. Fla...

AI Technical Summary

Problems solved by technology

At present, in the production process of disc plates, in order to improve the strength, hollow structures are generally adopted. During the production process of disc plates with hollow structures, molten iron will impact the cores in the upper and lower sand boxes, so that the cores will be deflected. This makes it difficult to control the wall thickness of the disc, thereby reducing the qualified rate of the product, increasing the difficulty of casting the product, and increasing the production cost; at the same time, the shaft holes of the existing disc are all set at the same location as the disc. Flat surface, after the installation is completed, because there is a certain gap between the disc plate and the butterfly valve, the sealing performance of the disc plate is not very good. In addition, the rotating shaft is easy to impact the disc plate during the rotation process, which will cause damage to the disc plate after a long time

Therefore, the existing technology has problems such as low manufacturing precision, low pass rate, high production cost, poor sealing effect and easy damage to the disc plate.

Images