A Method for Measuring the Angle of Small Microholes in Blades Using Liquid

Abstract

A method for measuring the angle of a small microhole of a blade by using a liquid. Firstly, the accurate position of the measuring coordinate system of the aeroengine blade on an optical measuring device is obtained through a rigid measuring needle, and at the same time, a measurement image of the rigid measuring needle is obtained. Then compare and analyze the measurement image of the liquid column ejected from the air film hole with the measurement image of the rigid measuring needle, so as to calculate the allowable tolerance range of the air film hole processing and the liquid column in optical measurement. In this way, the liquid column sprayed from the air film hole can be directly used for image measurement to know whether the air film hole meets the processing requirements. The method provided by the present invention for measuring the angle of small micropores of blades by using liquid can directly measure the air film hole angles of all blades quickly and intuitively, obtain real air film hole angle data, and greatly improve the measurement efficiency.

Description

technical field [0001] The invention relates to the field of measurement technology, in particular to a method for measuring the real angle of small microholes on aeroengine blades by using liquid as an optical measurement medium. 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 la...

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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