Drying bracket and drying device for impeller casting plaster mold

Abstract

The invention discloses a drying bracket for an impeller casting plaster mold and a drying device. The drying bracket comprises a bottom plate. A circle of conical baffle connected with the bottom plate is installed on the bottom plate. The top face of the bottom plate is a slope with the higher periphery and a lower middle. A center hole is formed in the center of the bottom plate. Multiple height-adjustable flat gaskets are arranged on the top face of the conical baffle. Due to the conical baffle, a low-melting-point alloy in a plaster mold core is melted and then flows towards the bottom plate along the conical baffle and flows out from the center hole of the bottom plate; and the height of the flat gaskets can be adjusted vertically so that the flat gaskets can support the lower side of an outer ring of the plaster mold, and the plaster mold can be prevented from deforming.

Description

technical field [0001] The invention relates to a drying bracket and a drying device for impeller casting plaster molds. Background technique [0002] The integral impeller is the heart of a turbine engine, centrifugal compressor or centrifugal pump. Most impellers have thin walls, twisted blades, complex structures, and high requirements for dimensional accuracy and surface roughness. In order to obtain impellers with high precision and high surface roughness, advanced plaster molds are used for casting. [0003] The gypsum mold needs to be dried before use. The investment pattern inside the gypsum core is heated and melted, and the moisture in the gypsum is dried at the same time. The drying bracket currently used is relatively simple, which is easy to cause damage to the gypsum mold and affect the surface quality. [0004] However, the production method of the impeller core is complicated and the cost is high. If there is a problem with drying, the cost will increase gre...

AI Technical Summary

Problems solved by technology

[0003] The gypsum mold needs to be dried before use, heating and melting the investment pattern inside the gypsum core, and drying the moisture in the gypsum at the same time. The drying bracket currently used is relatively simple, which is easy to cause damage to the gypsum mold and affect the surface quality.

[0004] However, the production method of the impeller core is complicated and the cost is high. If there is a problem with drying, the cost will increase greatly. Because the impeller core has a special shape, the thickness of each part is different, there are many gaps in the middle of the core, and the weight distribution is uneven. , it is prone to cracks during placement and drying, and the core needs to be supported on the circumference (such as figure 1 shown)

However, due to the fact that the bottom surface of the core cannot be guaranteed to be completely flat, and the drying bracket will be slightly deformed after long-term use, etc.

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