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A Method of Establishing Workpiece Measuring Coordinate System Based on Surface Datum

A technology for measuring coordinate systems and datums, applied in measuring devices, instruments, etc., to achieve the effect of improving measurement efficiency and shortening time

Active Publication Date: 2018-11-16
XI'AN AIRCRAFT INTERNATIONAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This design brings a whole new challenge to the CMM of touch-sensitive measurement

Method used

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  • A Method of Establishing Workpiece Measuring Coordinate System Based on Surface Datum
  • A Method of Establishing Workpiece Measuring Coordinate System Based on Surface Datum
  • A Method of Establishing Workpiece Measuring Coordinate System Based on Surface Datum

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Embodiment Construction

[0016] In this embodiment, a step of establishing a measuring coordinate system for a workpiece on a three-coordinate measuring machine is used to further illustrate the inventive solution.

[0017] Embodiment The sketch of the rear rib part of the Boeing 747-8 model, A, B, and C are three reference curved surfaces. According to the design requirements, it is required to use the curved surfaces A, B, and C as the reference to measure the surface profile of the part. Before the measurement, the correct measurement coordinate system must be established. Points A1, A2, A3 on surface A; points B1, B2 on surface B; point C1 on surface C are given reference target points and the theory of these six reference target points in the measurement coordinate system coordinate value. The coordinate values ​​are A1 (3.9969, 2.8613, 0), A2 (15.2039, 3.9555, 0), A3 (15.4968, 1.7341, 0), B1 (3.7657, 0, -0.1892), B2 (15.7499, 0, -0.1875) , C1 (0, 2.7178, -0.1980).

[0018] The steps to establ...

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Abstract

The invention relates to a method for establishing a workpiece measurement coordinate system based on a curved surface benchmark, which is characterized in that theoretical coordinate values of six benchmark target points on the curved surface benchmark in the workpiece measurement coordinate system are known, six measurement points, which are close to the six benchmark target points in position, are selected on the curved surface benchmark, and an initial measurement coordinate system is established; in the initial measurement coordinate system, automatic measurement is performed according to the theoretical coordinate values of the six benchmark target points, accurate positions, which are closer to the six benchmark target points, are searched, and coordinates values of six measurement points for the second time of measurement are acquired; the coordinates values of the six measurement points for the second time of measurement are compared with the theoretical coordinates values of the six benchmark target points, and whether the value of deviation meets a tolerance requirement or not; and when the value of deviation of the coordinate values of the six measurement points and the theoretical coordinate values of the six benchmark target points meets the tolerance requirement, the current coordinate system is regarded as the workpiece measurement coordinate system.

Description

technical field [0001] The invention relates to the technical field of three-coordinate measuring machine detection, in particular to a method for establishing a workpiece measurement coordinate system based on a curved surface. Background technique [0002] In the detection process of the three-coordinate measuring machine, the establishment of the measurement coordinate system of the workpiece is the first prerequisite for the correct measurement of the workpiece. How to establish the workpiece coordinate system accurately and quickly is a key step in the detection of three-coordinate measuring machines. [0003] In the past, the traditional method of establishing a coordinate system was based on the given datum as simple elements such as surfaces, lines, and points. It was a direct 3-2-1 method of establishing a coordinate system. The specific method is as follows: [0004] Establish a 3-2-1 coordinate system: [0005] 1. Measure four points on the standard block, const...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B21/04
CPCG01B21/04
Inventor 周睿路永丁圣
Owner XI'AN AIRCRAFT INTERNATIONAL