Method for measuring angle of blade micropore by using gas

Abstract

The invention relates to a method for measuring the angle of a blade micropore by using gas. The method comprises the following steps of: firstly, acquiring the accurate position of a measurement coordinate system of an aero-engine blade on optical measurement equipment through a rigid measurement needle, and simultaneously acquiring a measurement image of the rigid measurement needle; then comparing and analyzing the measurement image of an air column ejected from an air film hole with the measurement image of the rigid measurement needle so as to calculate the corresponding relationship between a tolerance range allowed by the air film hole processing and the image data of the air column in optical measurement, thus visually and directly utilizing the air column sprayed out of the air film hole for image measurement, and acquiring that whether the air film hole meets the machining requirement or not. According to the method of measuring the angle of a blade micropore by using gas provided by the invention, the angles of the gas film holes of all blades can be rapidly, intuitively and directly measured to obtain real gas film hole angle data, so that the measurement efficiency isgreatly improved.

Description

Technical field[0001]The present invention relates to the field of measurement technology, in particular to a method for measuring the true angle of small micro holes on an aeroengine blade by using gas as an optical measurement medium.Background technique[0002]For modern aero-engines, with the increasing performance, the working environment of various components, especially blades, is getting worse and worse. Therefore, various technical means are needed to deal with it. For example, for turbine blades, to ensure their It also maintains good mechanical properties under high temperature and high pressure environments. It is necessary to cast the blade into a hollow structure, set an exhaust channel in the inner cavity, and process multiple pieces on the blade body, especially the exhaust edge of the blade body. 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 a...

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

[0015] Although the above scheme of using rigid measuring needles for measurement has high data accuracy, on each blade of each batch, at least one of the air film holes 21 in each group of the air film holes 21 Assemble the measuring needle, and the assembly of the measuring needle is relatively cumbersome, so the labor intensity of the workers is still relatively high, and because the assembly of the measuring needle takes a long time, the overall measurement efficiency needs to be improved

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