Low-pressure casting method for aluminum alloy fan blade

Abstract

The invention discloses a low-pressure casting method for an aluminum alloy fan blade and relates to the technical field of fan impeller casting. The low-pressure casting method comprises the following steps that 1, an aluminum alloy solution is prepared; 2, refining and modifying are conducted; 3, refining and degassing are conducted; 4, pouring is conducted; 4, shape correcting is conducted; and 5, inspecting is conducted. An aluminum alloy material is modified, so that the material performance is more stable, and the alloy performance is optimal; in the pouring process, a mold is heated in a partitioned mode, it can be guaranteed that the mold is cooled and shrunk in sequence, and it is guaranteed that the blade does not have surface and internal quality problems; and through inspection, defective products can be prevented from flowing into the market.

Description

technical field [0001] The invention relates to the technical field of fan impeller casting, in particular to a low-pressure casting method for aluminum alloy fan blades. Background technique [0002] The fan impeller rotates at high speed during use, bears very large centrifugal force, and withstands collisions and frictions such as dust. It is required that the impeller material has high tensile strength, high yield strength, high elongation, and has certain hardness and corrosion resistance. In order to meet the safety and reliability specified by fan products. At the same time, under the environment of high-speed rotation, the lightweight of materials will bring great economic benefits. Aluminum alloy products are widely used in fan products due to their low density, corrosion resistance, and simple processing methods. [0003] The blades of the fan impeller are made of aluminum alloy. The aluminum alloy blades are long and thin-walled parts, and the deformation is ser...

AI Technical Summary

Problems solved by technology

[0003] The blades of the fan impeller are made of aluminum alloy. The aluminum alloy blades are long and thin-walled parts, and the deformation is serious after solution treatment.

The traditional pouring method has the following problems: 1. In traditional pouring, in order to reduce the deformation of the blade, the feeding riser is increased on the top or side of the casting, and the temperature of the mold and the pouring temperature are increased, which not only costs a lot, but also causes grains Coarse, loose, and slag inclusion defects increase, resulting in insufficient performance

2. The traditional calibration method can easily lead to product cracks and injuries, low pass rate and high cost

3. For aluminum alloys with high silicon content, large pieces of flaky and needle-like silicon are easily produced between α dendrites, tearing the matrix, causing stress concentration, resulting in substandard tensile strength and elongation, while traditional sodium salts deteriorate It is easy to deteriorate and decline, and cannot change the shape of silicon and improve performance for a long time.