Micro-force measurement method for verticality of holes
A measurement method and verticality technology, applied in the field of measurement, can solve problems such as inability to provide instant feedback, affect measurement accuracy, and high operational difficulty, and achieve the effects of improving accuracy, improving measurement efficiency, and simple operation
Inactive Publication Date: 2012-02-22
BELTON ELECTRONICS SHENZHEN
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Problems solved by technology
[0003] The disadvantage of this method is that only a single probe is used for point-by-point measurement, and the efficiency is low; the coordinate value is recorded only after a single probe touches the inner wall to a certain strength, and the feedback cannot be instantaneous, which affects the measurement accuracy, and the operation is difficult
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[0029] The present invention uses the principle of determining a circle with three points, uses three probes to determine the coordinates of three points on the same cross-section of the inner wall of the circular hole, and calculates the center of the circular hole in the cross-section. Move the probe along the axis of the hole, calculate the center coordinates of different cross sections, and determine whether the verticality of the hole wall meets the standard according to the degree of dispersion of the center coordinates.
[0030] Firstly, the method of measuring the coordinates of the center of the aperture in a certain cross-section is described.
[0031] The probe is generally spherical, and the radii and initial coordinates of the three probe circles are known, and the center coordinates and radius of the circumscribed circles of the three circles can be calculated.
[0032] like figure 1 As shown, in the given coordinate system, let the radius of the first circle be...
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The invention discloses a method for measuring the perpendicularity of a hole. The method is based on the principle of determining a circle with three points. Measurements are made with two stationary probes and one moving probe. After the three probes enter the hole, move the probes until all the probes touch the inner wall of the hole, record the coordinate values of the three probes at this time, and obtain the center coordinates of the hole in the cross section by determining a circle based on three points. Adjust the height of the probe entering the circular hole, and repeat the above method to obtain the coordinates of the center of the hole in different cross-sections, thereby obtaining the verticality of the hole. When the present invention measures the center of the cross section, the probe can also be rotated, the test angle can be changed, multiple test results can be obtained, and the comprehensive value can be taken. The invention has high testing efficiency, is simple and easy to implement, and is suitable for batch testing.
Description
【Technical field】 [0001] The invention relates to the field of measurement, in particular to a method for measuring perpendicularity. 【Background technique】 [0002] To calculate the perpendicularity, it is first necessary to measure the center position of the hole to be measured in different cross-sections (indicated by coordinates), and then use the perpendicularity calculation formula to calculate the perpendicularity. The existing verticality measurement generally adopts CMM machine (three-coordinate measuring instrument). The measurement method is: the workpiece is fixed, and there is only one probe. Each stop position of this probe can be recorded. Using this probe to measure each cross-section The 8 points on the inner wall of the hole are scanned point by point (the probe stops after touching the inner wall to a certain strength, and the coordinates of this point are recorded), so as to obtain the center coordinates of each cross-sectional hole, and then calculate th...
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IPC IPC(8): G01B7/305G01B7/004
Inventor 曹艳美李振旗张永红陈珏然
Owner BELTON ELECTRONICS SHENZHEN