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Hollow blade intracavitary residue detection method

A technology for hollow blades and redundant objects, which is applied in the pretreatment of hollow blades before neutron photography, and in the field of detection of redundant objects in the inner cavity of hollow blades. , a wide range of prices, the effect of simple process

Inactive Publication Date: 2019-11-08
GUIYANG AVIC POWER PRECISION CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to propose a method for detecting the excess in the cavity of the hollow blade for the subsequent neutron radiography in view of the technical problem that the accurate detection of the excess in the cavity of the hollow blade cannot be realized at present.

Method used

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  • Hollow blade intracavitary residue detection method
  • Hollow blade intracavitary residue detection method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038]1.1 Prepare 10% gadolinium nitrate aqueous solution. According to the mass ratio of gadolinium nitrate and water to 0.11, mix gadolinium nitrate hexahydrate with water, stir evenly, and obtain soaking solution after gadolinium nitrate hexahydrate is completely dissolved in water. Wherein the purity of gadolinium nitrate hexahydrate is above 99%.

[0039] 1.2. Soak the hollow leaf in the gadolinium nitrate soaking solution obtained in step 1 and completely submerge it in the soaking solution. Control the temperature of the soaking solution at 24°C, put the container in the vacuum box, turn on the vacuum pump, and keep the vacuum at 0.09atm , the hollow leaves are continuously soaked for 6 hours and then taken out.

[0040] 1.3 Put the soaked hollow leaf into an ultrasonic water tank with a frequency of 64KHZ for 10 minutes, then take it out, put it in a drying oven at 90°C for 1 hour, and then cool the hollow leaf to room temperature.

Embodiment 2

[0042] 1.1 Prepare 20% gadolinium nitrate aqueous solution. According to the mass ratio of gadolinium nitrate and water to 0.25, mix gadolinium nitrate hexahydrate with water, stir evenly, and obtain soaking solution after gadolinium nitrate hexahydrate is completely dissolved in water. Wherein the purity of gadolinium nitrate hexahydrate is above 99%.

[0043] 1.2. Soak the hollow leaf in the gadolinium nitrate soaking solution obtained in step 1 and completely submerge it in the soaking solution. Control the temperature of the soaking solution at 35°C, put the container in the vacuum box, turn on the vacuum pump, and keep the vacuum at 0.07atm , and the hollow leaves were continuously soaked for 8 hours and then taken out.

[0044] 1.3 Put the soaked hollow leaf into an ultrasonic water tank with a frequency of 24KHZ for 15 minutes, take it out, put it in a drying oven at 100°C for 1 hour, and then cool the hollow leaf to room temperature.

Embodiment 3

[0046] 1.1 Prepare 15% gadolinium nitrate aqueous solution. According to the mass ratio of gadolinium nitrate and water to 0.176, mix gadolinium nitrate hexahydrate with water, stir evenly, and obtain soaking solution after gadolinium nitrate hexahydrate is completely dissolved in water. Wherein the purity of gadolinium nitrate hexahydrate is above 99%.

[0047] 1.2. Soak the hollow leaf in the gadolinium nitrate soaking solution obtained in step 1 and completely submerge it in the soaking solution. Control the temperature of the soaking solution at 15°C, put the container in the vacuum box, turn on the vacuum pump, and keep the vacuum at 0.08atm , the hollow leaves are continuously soaked for 7 hours and then taken out.

[0048] 1.3 Put the soaked hollow leaf into an ultrasonic water tank with a frequency of 48KHZ for 13 minutes, then take it out, put it in a drying oven at 80°C for 1 hour, and then cool the hollow leaf to room temperature.

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Abstract

The invention belongs to the technical field of nondestructive detection, and discloses a hollow blade intracavitary residue detection method which is applied in neutron radiography, and includes thefollowing main steps: (1) preparing 10%-20% of a gadolinium nitrate aqueous solution; (2) placing a to-be-detected hollow blade into the gadolinium nitrate aqueous solution, soaking the to-be-detectedhollow blade at a vacuum degree of 0.07-0.09 atm for 6-8 hours; (3) continuously washing the to-be-detected hollow blade in a 24-64KHZ ultrasonic tank for 5-15 minutes; and (4) drying the be-detectedhollow blade at 80-100 degrees by baking. The to-be-detected hollow blade processed by the method is subjected to neutron radiography, and intracavitary residues of the hollow blade, including a residual core, residual iron powder produced after powder filling detection, and impurities sucked by the blade after long working hours, can be removed effectively. The method is simple in process, low in cost and accurate in detection results, and avoids erroneous judgement and missed judgment caused by other detection methods.

Description

technical field [0001] The invention belongs to the technical field of non-destructive testing, and relates to a method for detecting redundant objects in the cavity of a hollow blade, which is specifically applied to the pretreatment of the hollow blade before neutron photography. Background technique [0002] In the process of investment precision casting, the cooling channels with complex shapes and tortuous inner chambers of high-efficiency air-cooled blades need to be formed by prefabricated ceramic cores with complex shapes. The key to casting high-efficiency air-cooled blades is to form complex cooling channels inside the blades. Preparation of ceramic cores. The cooling channels inside the high-efficiency air-cooled blade are very complex, resulting in a very complex shape of the ceramic core that forms the cavity inside the blade. The inner cavity channel is formed after the core removal process of the blade casting, and there are often some residual ceramic cores,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N23/05
CPCG01N1/28G01N23/05
Inventor 顾国红王小波李鑫牛书鑫
Owner GUIYANG AVIC POWER PRECISION CASTING
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