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Casting process and testing technology for wind axial fan castings
- Aug 13, 2018 -

The operation of injecting molten metal into the mold from the ladle is called pouring. In the production of the casting process of the wind-axial fan casting, the principle of high-temperature tapping and low-temperature pouring should be followed during pouring. Because the extraction temperature of the molten metal is favorable for the complete melting of the inclusions, the slag floating, the slag and the degassing are facilitated, and the slag inclusion and the porosity defects of the machine tool casting are reduced.

 

The lower casting temperature is beneficial to reduce the gas solubility, liquid shrinkage and high temperature metal liquid baking on the surface of the cavity, avoiding defects such as pores, sand and shrinkage. Therefore, a lower pouring temperature should be used as much as possible while ensuring that the mold cavity is filled.

 

After the casting of the wind axial fan casting, it is possible to detect various opening defects on the surface by liquid permeation, such as surface cracks, surface pinholes and the like which are hard to find by the naked eye. The commonly used penetration test is coloring detection, which wets or sprays a colored liquid with high permeability on the surface of the casting, the penetrant penetrates into the opening defect, quickly wipes off the surface permeate layer, and then the easy-to-dry display agent Sprayed onto the surface of the casting, after the penetrant remaining in the opening defect is sucked out, the display agent is dyed to reflect the shape, size and distribution of the defect.

 

The accuracy of the penetration detection of the wind-axial flow fan casting decreases with the increase of the surface roughness of the tested material, that is, the better the surface light detection effect, the surface inspection accuracy of the grinding machine is the highest, and even the intergranular crack can be detected. In addition to color detection, fluorescence permeation detection is also a commonly used method for liquid permeation detection. It requires an ultraviolet lamp to be used for illumination observation, and the detection sensitivity is higher than that of color detection.

 

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