Using method of measuring needle for measuring angle of small micropore of blade

Abstract

The invention provides a using method of a measuring needle for measuring the angle of a small micropore of a blade. The measuring needle comprises an insertion part and an extension part, and the method comprises the following steps: step A, providing a device for assembling the measuring needle, and enabling a film hole of a blade to face upwards; step B, enabling the end of the insertion part to be in contact with a port of the film hole, starting an air extractor, and forming negative pressure in the inner cavity of the aero-engine blade, so that the insertion part is sucked into the air film hole until the extension part is in contact with the port of the air film hole, and the assembly of the measuring needle is completed. According to the using method of the measuring needle for measuring the angle of the small micropore of the blade, the specially-made measuring needle can be assembled into the air film hole of the blade, so that real angle data of the air film hole can be obtained through optical measurement.

Description

technical field [0001] The invention relates to the technical field of measurement, in particular to a method for using a measuring needle for measuring the real angle of a small microhole on an aeroengine blade. Background technique [0002] For modern aero-engines, with the increasing performance, the working environment of various components, especially the blades, is getting worse and worse. Therefore, various technical means need to be used to deal with it. For example, for turbine blades, in order to ensure their To maintain good mechanical properties under high temperature and high pressure environment, it is necessary to cast the blade into a hollow structure, set the exhaust passage in the inner cavity, and process multiple The air film hole is connected to the inner cavity, so that the cold air entering the inner cavity can be ejected from the air film hole of the blade body, and while taking away a certain amount of heat from the blade body, a layer of cold air pr...

AI Technical Summary

Problems solved by technology

[0010] 1. It can only judge whether the angle (that is, the processing parameters) adjusted by the fixture and / or machine tool is correct. For example, the angle is measured by processing a large hole of φ1 with a measuring rod. After the angle is qualified, the angle of a small hole with a diameter of φ0.25 is processed by default. Qualified, but the actual large hole of φ1 is not directly related to the diameter of φ0.25 (the parameter settings of the EDM equipment are different), this measurement method has a large error, usually between 1° and 1.5°

[0011] 2. The inner cavity of the aero-engine blade 100 has complex circuits and ribs. After the measuring rod enters the inner cavity, it is easy to interfere, causing the measuring rod to tilt to one side, and the measurement angle is inaccurate

[0012] 3. The aeroengine blades 100 are all made of high-temperature alloy materials, so the processing is difficult and the processing time is long. Usually, it takes about 15 minutes to process a φ1 hole

[0013] 4. The aero-engine blade 100 after processing the φ1 hole can only be scrapped, and 2 to 3 blades need to be scrapped for each batch of blade processing, and the price of each blade is 10,000 to 30,000, which causes great waste

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