Fixture for three-coordinate measuring machine of blade and method for establishing measuring coordinate system

Abstract

The invention provides a fixture for a three-coordinate measuring machine of a blade and a method for establishing a measuring coordinate system. An upper surface of a fixture body is provided with a V-shaped tongue-and-groove, and a wedge-shaped surface of the V-shaped tongue-and-groove is completely coincided with a wedge-shaped surface of a blade tongue root. The V-shaped tongue-and-groove is positioned on a central line of a width of the fixture body. A set screw is positioned on a symmetric centre of a length and the width of the fixture body. When the measuring coordinate system of the fixture for the three-coordinate measuring machine of the blade is established, a coordinate plane is established through three points, a coordinate axis is established through projections of a connecting line of the two points on the coordinate plane and a coordinate origin point is determined by one point, and thereby the measuring coordinate system of the blade is fast and accurately established; moreover, the measuring coordinate system can be fast converted from the blade tongue root to the fixture body by using the rectangular fixture body so as to reduce time and difficulty of establishing the measuring coordinate system in the blade measuring process. The fixture of the invention has the advantages of simple structure, convenience for mounting and high locating precision, can be detached for multiple times without affecting the locating precision, can realize batch measurement of the blades and increases the blade measuring efficiency.

Description

technical field

[0001] The invention relates to the technical field of engine blade measurement, in particular to a fixture for blade measurement. technical background

[0002] The development of the modern aviation industry has higher and higher requirements for the technical performance of the engine. Various new blades have been designed. In order to ensure the quality of blades, different stages of blade manufacturing need to be measured, and the process runs through the entire stage from wool, machining to blade assembly.

[0003] Blade detection is an important means to ensure the quality of blade manufacturing, but due to the existence of problems such as difficult positioning, it has always been a difficult point in the blade processing process, specifically manifested in: high measurement accuracy requirements; high measurement efficiency requirements; high measurement reliability requirements; The measurement positioning and the establishment of the measurement co...

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