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Method for precision measurement of point on space surface and the space surface by utilizing point gage sphere centre coordinate

A technology of precise measurement and measurement point, applied in the direction of measurement device, mechanical measurement device, mechanical counter/curvature measurement, etc., can solve the problems of difficult calculation, measurement error, wrong measurement result, etc.

Active Publication Date: 2009-05-06
HONGTA TOBACCO GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] If the measurement radius compensation is turned off when measuring a space surface, the acquired coordinate data is not the coordinate data on the contour surface, but the coordinate position of the stylus center; if the stylus radius compensation is enabled, the measurement theory requires the stylus to move along the measured point The normal vector is used for approach compensation measurement, otherwise measurement errors or wrong measurement results will occur, but it is not easy to calculate the normal vector of the measured point on any space surface

Method used

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  • Method for precision measurement of point on space surface and the space surface by utilizing point gage sphere centre coordinate
  • Method for precision measurement of point on space surface and the space surface by utilizing point gage sphere centre coordinate
  • Method for precision measurement of point on space surface and the space surface by utilizing point gage sphere centre coordinate

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Embodiment 1

[0059] Embodiment 1: Measurement and program design method of any feature point on any space surface

[0060] The precise measurement of points on any space surface cannot be completed in manual mode, and a program must be designed to automatically measure in NC mode.

[0061] see Figure 4 and Figure 5 , let the projection coordinates of any feature point on the space surface in XOY be: (x0, y0), let it be the center of gravity coordinate M, then the apex coordinate of the equilateral triangle is M1 j+1 (x0-2d / 3, y0), M3 j+1 (x0+d / 3, y0-k) and M3 j+2 (x0+d / 3, y0+k). In this way, the conditional points on the space surface that are projected as equilateral triangles have been determined, and the z coordinates of the 4 points are undetermined. Turn off the radius compensation of the stylus, and the design program will automatically measure the 4 points in NC mode to obtain their z coordinates accurately. position, calculate M1j+1 , M3 j+1 and M3 j+2 The normal vector of...

Embodiment 2

[0074] Embodiment 2: measurement of space surface

[0075] Several measuring points are successively established on the projection surface of the spatial curved surface, and the precise coordinate values ​​of each measuring point are obtained by using the above method respectively, so as to obtain the entire contour coordinate value on the spatial curved surface.

[0076] Figure 7 see as image 3 projection, such as Figure 7 As described above, a coordinate system is established at the rotation center of the space surface, and the space rotation surface is measured with equal divisions in the projected XOY coordinate system. Turn off the radius compensation of the stylus, apply the direction cosine V(0, 0, -1), and make the stylus measure along the vector direction of the direction cosine on the space surface on the circle with R1, R2 and R3 as projected polar radii point M1 j+1 , M2 j+1 and M3 j+1 , the polar angle values ​​α of these points are all the same, which ca...

Embodiment 3

[0091] Embodiment 3: space surface test on the standard sphere:

[0092] The contour on the standard sphere can be regarded as an arbitrary space curved surface. Since the standard sphere has a high-precision contour surface, it is the reference calibration ball of the measuring machine. When using the above-mentioned theoretically designed program to test the arbitrary space curved surface on the standard sphere, then, the test The results can also serve as a scientific basis for evaluating measurement procedures and methods.

[0093] The parameters of the standard ball are: the diameter deviation is 0.00015mm, and the average diameter is about 15.875152mm. like Figure 8 , establish a measurement coordinate system on the sphere, and its center is set at the center of the sphere, and test the space surface of the upper hemisphere:

[0094] The first step: according to Figure 4 To construct the geometric characteristics of a regular triangle, first determine the position o...

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Abstract

The invention relates to a method for precisely measuring points on a space curved surface by using a coordinate of a center of a sphere of a survey probe, comprising the following steps: (1) a minisize triangle having a regular triangle projecting plane is set up on the space curved surface to lead a projective point (M) of a measuring point (G) on the space curved surface to be in the center ofthe regular triangle; (2) the normal direction vector of the tiny triangle on the space curved surface is calculated; (3) the normal direction vector is taken as the direction of approach and compensation of the survey probe, and the measuring point (G) is taken as the measurement target point; radius compensation of the survey probe is started to obtain the precise measured value of the measuring point (G). The method also can be used for the measurement of complicated space curved surface and has very high measurement accuracy.

Description

technical field [0001] The invention relates to a method for precisely measuring points on a space curved surface and a space curved surface. In particular, it relates to the method of creating micro-triangles on any space surface, completing its direction cosine calculation, and using its normal vector to implement precise measurement on any space surface on a three-coordinate measuring machine. The invention is applicable to the testing of spatial curved surfaces on measuring machines in the field of machinery manufacturing, such as reverse engineering and metrological verification, etc.; it is also applicable to the research of precision testing technology on arbitrary spatial curved surfaces on measuring machines, including the measuring machine control system and software system research, modular design of measuring machine functions, etc. Background technique [0002] In the measurement test of any space curved surface by three-coordinate measurement, the key technolo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B5/008G01B5/20
Inventor 李存华
Owner HONGTA TOBACCO GRP
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