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Method for detecting arc surface error of aircraft cabin door

An error detection and arc surface technology, which is applied in the field of digital detection and can solve the problems that the measurement results depend on the arc length of small arcs and the degree of automation is low.

Inactive Publication Date: 2018-07-27
XIAN AIRCRAFT IND GROUP
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AI Technical Summary

Problems solved by technology

[0004] The disadvantage of this method: the measurement result depends on the size of the arc length of the small arc
The coordinate data of the measurement points used for fitting needs to be measured manually, and the coordinate values ​​selected by different operators are different; the degree of automation of the measurement process is low
In the measurement process of the fitting circle center method, there are many manual operations, and the degree of automation of the measurement process is low

Method used

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  • Method for detecting arc surface error of aircraft cabin door
  • Method for detecting arc surface error of aircraft cabin door
  • Method for detecting arc surface error of aircraft cabin door

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Embodiment Construction

[0024] According to attached Figure 1-2 , a method for detecting an error of an arc surface of an aircraft cabin, is characterized in that it is measured in layers according to the arc section, and the steps are as follows:

[0025] (1) Place the large-radius and small-arc parts on the three-coordinate measuring machine platform for positioning;

[0026] (2) The plane vector direction is defined as the Z-axis positive direction with the table top of the machine tool platform as the reference, and the plane is defined as the Z-direction zero plane;

[0027] (3) Measure three points on the end surface 1 of the product, and fit the three points into a plane. The vector direction of the plane is defined as the negative direction of the Y axis, and the plane is defined as the zero plane in the Y direction;

[0028] (4) A set of coordinate data is scanned near the highest point in the Z direction of the arc surface 2 of the part, and its range covers the highest point in the Z dir...

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Abstract

The invention provides a method for detecting an arc surface error of an aircraft cabin door. A positioning coordinate system of a product is established on the product and a scanning operation is performed on the product. Corresponding parameter items are set in a scanning function module of measurement software. After the scanning operation is completed, coordinate data of a vertex are extractedfrom the scanned coordinate data point data. The coordinate data after the coordinate data of the vertex is inversely shifted by a theoretical radius in a vector direction thereof are coordinate dataof the center of the circle. A comparison is conducted with the theoretical value, the coordinate system is fine-tuned according to the result of the comparison until the deviation of each data pointreaches an optimal state, and the deviation of each point is evaluated to obtain an evaluation result of the shape error.

Description

technical field [0001] The invention belongs to the field of digital detection, and is used for detecting large-radius and small-arc shape errors on a three-coordinate measuring machine. The detection requirements for such shape errors are commonly found in the detection of the arc surface of an aircraft cabin door and the aircraft window frame in the field of aircraft manufacturing. Arc surface detection. Background technique [0002] In the field of aircraft manufacturing, aircraft doors require control of the shape error of its arc surface at a fixed radius. The aircraft door requires the detection of the arc surface under the condition that the theoretical radius is given. Its theoretical radius can reach 2000 mm, but the arc length is less than 800 mm, and the corresponding central angle is even less than 30 degrees. This kind of arc shape error detection project with small center angle and large radius is a very typical large radius and small arc shape error detectio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B5/20G01B5/213
CPCG01B5/20G01B5/213
Inventor 丁圣路永樊二勇
Owner XIAN AIRCRAFT IND GROUP
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