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Method of three-coordinate machine measuring free-form curve

A three-coordinate machine and free technology, applied in the field of measurement, can solve the problems that the profile does not have geometric features, cannot realize the correct measurement of free curves, and cannot guarantee that the probe is perpendicular to the profile point, and achieves simple operation and obvious effect , The effect of the simplified measurement process

Inactive Publication Date: 2016-11-09
HARBIN DONGAN ENGINE GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For parts with free curve surfaces, since the surface does not have geometric features, it is impossible to ensure that the probe is perpendicular to the surface when measuring
Although some coordinate machines can realize the measurement of free curves through the mathematical model of parts, for some three-coordinate machines without model processing functions, or when the parts do not have mathematical models, the correct measurement of free curves cannot be realized

Method used

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  • Method of three-coordinate machine measuring free-form curve
  • Method of three-coordinate machine measuring free-form curve
  • Method of three-coordinate machine measuring free-form curve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0024] Measure the curved surface of a free curve sample of a test blade, and its design drawings require that the tolerance of the coordinates of the curve points be ±0.005mm. The measurement steps are as follows:

[0025] (1) Record the coordinate value points of all continuous points on the curved surface of the free curve template:

[0026]

[0027] (2) Select the point coordinates of the non-end points to be measured in turn, and the coordinates of two adjacent points, and use the coordinate values ​​of the two adjacent points to calculate the normal angle θ at the midpoint of the two adjacent coordinate points:

[0028]

[0029] (3) According to the result of step (2) and the coordinate values ​​of two adjacent points, define the point to be measured (x n ,y n ), the normal vector (I, J, K) at

[0030]

[0031] The result is as follows:

[0032]

[0033] (4) Input the coordinate value and direction vector of the measuring point into the measuring machine ...

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Abstract

The invention relates to a method of three-coordinate machine measuring a free-form curve. A normal vector of a middle point between two adjacent points is calculated, and is defined as a normal vector of a to-be-measured point, and therefore a problem of a measuring machine without a digital-analog processing capability or a part without a mathematical model of measuring curve coordinate points is solved The problem of the three-coordinate machine of inability of detecting the free-form curve correctly is effectively solved, even when the part does not have the digital-analog model or the three-coordinate machine does not have a model processing module.

Description

technical field [0001] The invention relates to a measuring method, in particular to a method for measuring a free curve with a three-coordinate machine. Background technique [0002] When the three-coordinate machine measures point features, it touches the surface of the part vertically, and then compensates the radius of the probe to realize the coordinate measurement of the point on the part. For parts with a free curve surface, since the surface does not have geometric features, it is impossible to ensure that the probe is perpendicular to the surface to collect points during measurement. Although some coordinate machines can realize the measurement of free curves through the mathematical model of parts, for some three-coordinate machines without model processing functions, or when the parts do not have mathematical models, the correct measurement of free curves cannot be realized. Contents of the invention [0003] The purpose of the invention is to study a method fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B21/00G01B21/20
CPCG01B21/00G01B21/20
Inventor 张野张世林雷云莲崔柏慧侯阳席岷彭铎
Owner HARBIN DONGAN ENGINE GRP
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