Neutron radiography detection method for residual core of hollow turbine blade

Abstract

The invention discloses a neutron radiography detection method for a residual core of a hollow turbine blade cavity. The method comprises the following steps that distilled water is prepared by utilizing purified water; the distilled water is contained by a special plastic water container; a hollow turbine blade is horizontally placed and completely immersed into the distilled water for 5-10min; a water level is kept to be slightly higher than the horizontal placing height of the blade; the plastic water container is loaded into a freezing chamber for continuous cooling; the temperature is controlled to be -10-30 DEG C; the plastic water container is taken out after complete freezing; the blade is taken down; an ice cake on the surface of the blade is removed; residual flake ice and water stains on the surface of the blade are cleaned by dry water absorption cloth; and the blade is loaded into a neutron radiography detection chamber. An attenuation coefficient of a core material to a thermal neutron ray is far less than an attenuation coefficient of ice to the thermal neutron ray, so that thermal neutron radiography detection of the residual core can be performed. The thermal neutron radiography detection method for the residual core is simple to operate and high in residual core detection rate, and is applicable to a neutron film radiography method and a real-time imaging method.

Description

technical field [0001] The invention belongs to the scope of non-destructive detection of residual cores of hollow turbine blades cast by aero-engines, and in particular relates to detecting residual cores by thermal neutron radiography after the cavity of hollow turbine blades is completely filled with water, frozen and frozen. Background technique [0002] With the continuous improvement of the casting technology of aero-engine hollow turbine blades, the shape and inner cavity of the blades are becoming more and more complex, and there are complex cooling channels inside the blades, and the quality requirements of the blades are also getting higher and higher. The manufacture of hollow turbine blades includes core making, mold making, shell making, pouring and core removal. Alumina series ceramic cores have been widely used, but after the blades are cored, it is often found that there is a core on the cavity of the blade. Material residues, this residual core will hinder t...

AI Technical Summary

Problems solved by technology

However, the industrial CT method has low detection efficiency and high detection cost, and is not suitable for rapid detection of large batches of leaves.

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