CN101571378A - Measurement method of axial size of abrupt-change cross section of revolving body - Google Patents
Measurement method of axial size of abrupt-change cross section of revolving body Download PDFInfo
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- CN101571378A CN101571378A CNA2009101483287A CN200910148328A CN101571378A CN 101571378 A CN101571378 A CN 101571378A CN A2009101483287 A CNA2009101483287 A CN A2009101483287A CN 200910148328 A CN200910148328 A CN 200910148328A CN 101571378 A CN101571378 A CN 101571378A
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Abstract
The invention belongs to the technical field of manufacture and measurement of measuring devices, more particularly relates to a high-precision automatic measurement method of axial size of abrupt-change cross section of a revolving body. The measurement method is based on the principles of adopting a high-precision linear array CCD optical imaging technology and a high-precision motion control technology, performing rapid measurement on a contour line at longitudinal section of the revolving body to obtain contour data of the revolving body, calculating curvature change of the contour line of the revolving body, and seeking local extremum points of the curvature change on the contour line to obtain the axial position of the abrupt-change cross section, thus calculating the axial size of the abrupt-change cross section. The measurement method is suitable for rapid measurement of the axial size of grooves, benches, frustums and the like of various complex revolving body parts, and the method is especially suitable for revolving body parts which are provided with small-space grooves and can not be easily measured by a contact method.
Description
Technical field
The present invention proposes a kind of measuring method of general abrupt-change cross section of revolving body axial dimension, is mainly used in the quick measurement of axial dimensions such as groove on the solid of revolution, step and frustum.
Background technology
Solid of revolution is common part shape, and its axial dimension often influences the assembly performance or the usability of part.Have a plurality of grooves, step and the frustum of a cone etc. on the described solid of revolution, need to measure a plurality of axial dimensions.For the solid of revolution of such complexity, the axial dimension of measuring groove, step and frustum quickly and accurately is a more insoluble problem always.Current measuring methods roughly is divided into several:
1. the contact direct method of measurement: adopt survey instrument such as milscale, vernier caliper or altimeter or instrument that groove, step etc. are directly measured.This method can be measured has plane-parallel groove or step, but can't measure the axial dimension of frustum.And this method is subjected to operating personnel's influence, and measuring accuracy is low, efficient is not high yet, is not easy to realize automatic measurement.
2. image method: utilize the optical system projection device that the real profile of tested part is projected on the shadow screen,, read the axial dimension of each step, groove or frustum by the scale on the camera lens.This method requires the solid of revolution measured section parallel with groove, otherwise measurement result is had very big influence.This method efficient is low, is subject to operating personnel's influence.
In sum, the length dimension measuring method and the instrument that have existed, to dimensional measurement, exist certain limitation for the rotator shaft of many grooves, step and frustum, can't satisfy the measurement requirement automatically quick and precisely of abrupt-change cross section of revolving body axial dimension.
Summary of the invention
The objective of the invention is to propose a kind of general measurement method of axial size of abrupt-change cross section of revolving body, is to utilize non-contact sensor to realize the complex section measurement, by data processing, solves the problems of measurement of complex revolving body abrupt-change cross section axial dimension.Specifically, adopt high precision line array CCD imaging technique and high-precision motion control technology exactly, measure the solid of revolution outline line in cross section in length and breadth, by calculating the curvature of revolving body contour line data point, the position of the identification revolving body contour abrupt change of cross-section, thereby the axial distance of judgement abrupt-change cross section.
In order to reach the purpose of foregoing invention, elaborate principle of the present invention below.In general, revolution shape is to be formed by crossing or tangent straight line and the rotation of curve wraparound commentaries on classics center.When parallel rays was radiated on the solid of revolution, solid of revolution can block a part of light.The light that only exceeds revolving body contour could arrive the back side of solid of revolution.The relative solid of revolution symmetry with the light emitted device of high precision line array CCD sensor is placed, and then revolving body contour can throw a figure on CCD.By image processing techniques, can obtain the radial dimension changing value of this place's solid of revolution.Because the narrower in width of line array CCD, what can think ccd sensor output is exactly the data of a point.When ccd sensor and light source move axially along solid of revolution, just can collect the whole profile data of solid of revolution.
The revolving body contour data of above-mentioned collection are the coordinate points under plane right-angle coordinate.Because rotator shaft is to inconsistent with the moving direction possibility of sensor, above-mentioned coordinate axis may be not parallel with the solid of revolution axis.For this reason, according to the outline data of obtaining, trying to achieve the centre symmetry line of two outline lines, select on the axis a bit to be initial point then, is the x axle with the central axis, sets up new rectangular coordinate system, and original measurement data is converted to data under the new coordinate system.Such data-switching has just been carried out translation and rotation to original figure, can not change the shape of figure.
The curvature of each point is constant on straight line or the circular curve, and the curvature of straight line is zero, and the curvature of circular arc is the inverse of radius, and at the intersection point place of straight line and straight line, straight line and circular curve, curvature has very big variation, and this asks for the theoretical foundation of intersection point just.In order to ask for the axial dimension of abrupt-change cross section, calculate the revolving body contour data along the curved transition figure on the x direction of principal axis (axial direction just).Because the existence of measuring error, the curvature of straight line may be little numerical value.Therefore, set a threshold value δ,, can think the intersection point of different line segments on the profile, the place of the revolving body contour abrupt change of cross-section just for the absolute value of curvature value data point greater than δ.Calculate the axial coordinate difference of two adjacent intersection points, just can be in the hope of the axial dimension of groove, step or frustum.
The main points and the step of the inventive method are:
1.. adopt high precision line array CCD imaging technique and precise motion control technology, measure the solid of revolution profile radial dimension of position vertically successively, obtain two contour curves.
2.. calculate the centre symmetry line of two contour curves, and be coordinate axis, select a bit to be initial point on it, set up rectangular coordinate system, measurement data is carried out coordinate conversion, obtain new outline data with this center line.
3.. each point is along the discrete curvature of centerline direction on the calculating revolving body contour line;
4.. search for successively that curved transition is greater than the unique point of defined threshold on the axial direction, these points are exactly the position of the solid of revolution abrupt change of cross-section.
5.. calculate the relative distance between the two adjacent unique points, obtain the axial dimension of abrupt-change cross section.
Beneficial effect
The present invention compares with existing other measurement method of axial size and has the following advantages:
1. owing to two cross-sectional datas that only need to measure solid of revolution are measured in the longitudinal section to solid of revolution, not high to the positioning accuracy request of workpiece.The measuring accuracy of this measuring method depends primarily on the measuring accuracy of ccd sensor, and is irrelevant with bearing accuracy;
2. this measuring method is measured revolving body workpieces at every turn, but the axial dimension of a plurality of grooves of one-shot measurement or step, measuring speed is fast, and process of measurement is simple, and it is convenient to implement.
3. the collection of this measuring method is the coordinate of solid of revolution longitudinal section point, is easy to carry out data processing, compares by establishment computerized algorithm and design specifications, can realize automatic measurement.
4. be applicable to the general measurement method of axial size of on-line measurement.
The present invention is suitable for the measurement of various revolving parts axial dimensions.
Description of drawings
Fig. 1 is the design drawing of tested solid of revolution in the embodiment of the invention.
Fig. 2 is an actual measurement longitudinal section profile diagram of tested solid of revolution in the embodiment of the invention.
Fig. 3 is for asking for two figures behind the actual measurement outline line center line in the embodiment of the invention
Fig. 4 sets up the figure of rectangular coordinate system for being the x axle with the center line with profile in the embodiment of the invention after the selected true origin.
Fig. 5 is the curvature figure at number of contours strong point in axial direction in the embodiment of the invention
Among the figure: the tested solid of revolution of 1-
Embodiment:
With method measurement of the present invention tested solid of revolution as shown in Figure 1, need to measure the axial dimension of each abrupt-change cross section, implementation step is:
1. high precision line array CCD sensor and parallel optical transmitting set are positioned at the symmetrical both sides of solid of revolution, the imaging on CCD of the profile of solid of revolution, utilize the optical imagery treatment technology, export two measured values that this some place solid of revolution directly makes progress, when ccd sensor moves the position vertically successively, just obtain two revolving body contour lines, constituted the longitudinal section of a solid of revolution.Because the alignment error of solid of revolution, there is certain inclination in the revolution shape that measures, as shown in Figure 2.
2. according to the longitudinal section outline data that measures, ask for the axis of symmetry of two buses, as shown in Figure 3.
3. with center line and selected some structure rectangular coordinate system, original measurement data is carried out data-switching under new coordinate system, as shown in Figure 4.
4. to the discrete curvature of the outline line among Fig. 4, obtain curved transition figure as shown in Figure 5 according to discrete curvature formula calculating each point.As can be seen, in the place of the solid of revolution abrupt change of cross-section, the curvature at this some place has a bigger pulse waveform.
5. assign thresholds δ asks for that curvature is greater than the unique point of threshold value on the contour curvature line, and these points are exactly the point of solid of revolution cross section profile sudden change.Calculate the axial difference between the adjacent feature point, just can calculate the axial dimension of abrupt-change cross section.
Claims (2)
1. abrupt-change cross section of revolving body axial dimension high-precision automatic measuring method, it is characterized in that: adopt high precision linear array CCD optical imaging technique and high-accuracy movement control technology, measure the two-dimensional contour shape of solid of revolution longitudinal section, by calculating the discrete curvature of outline data, ask for revolving body contour curvature extreme point in axial direction, obtain the axial location of abrupt-change cross section, record the axial dimension of abrupt-change cross section, its concrete steps are:
1.. adopt high precision line array CCD imaging technique and precise motion control technology, measure the solid of revolution profile radial dimension of position vertically successively, obtain two cross section curves.
2.. ask for the center line of two cross section contours, also just determined the axis direction of revolving body contour.
3.. calculate the discrete curvature of revolving body contour line each point;
4.. calculate the Local Extremum of curvature on the axial direction, this extreme point is exactly the axial location of abrupt-change cross section of revolving body.
5.. calculate the relative distance of each extreme point, obtain the axial dimension of abrupt-change cross section.
2. abrupt-change cross section of revolving body axial dimension method for automatic measurement as claimed in claim 1 is characterized in that: solid of revolution profile axial direction is to measure the same longitudinal section of solid of revolution simultaneously to obtain.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101483287A CN101571378B (en) | 2009-06-16 | 2009-06-16 | Measurement method of axial size of abrupt-change cross section of revolving body |
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| CN2009101483287A CN101571378B (en) | 2009-06-16 | 2009-06-16 | Measurement method of axial size of abrupt-change cross section of revolving body |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102141393A (en) * | 2010-12-28 | 2011-08-03 | 神龙汽车有限公司 | Method for detecting deviation of shaft-like part from reference gravity center line on basis of gas suspension and three-dimensional coordinate and gas suspension device |
| CN102355553A (en) * | 2011-10-11 | 2012-02-15 | 陈博威 | Method for realizing light shadow calligraphic work |
| CN103063109A (en) * | 2012-12-27 | 2013-04-24 | 贵州黎阳航空动力有限公司 | Limiting axial wall thickness dimensional measurement method of variable cross-section inner cavity revolution body |
| CN110500950A (en) * | 2018-05-16 | 2019-11-26 | Juki株式会社 | Check device |
| CN111678476A (en) * | 2020-06-12 | 2020-09-18 | 西安中科微精光子制造科技有限公司 | Method for measuring direction and spatial position of rotation center of rotating shaft |
| CN113052787A (en) * | 2019-12-27 | 2021-06-29 | 中核北方核燃料元件有限公司 | Automatic identification device and method for riser of ball blank |
| CN114894134A (en) * | 2022-05-20 | 2022-08-12 | 成都飞机工业（集团）有限责任公司 | Method, device, equipment and medium for measuring space size of rotary part |
| WO2023024333A1 (en) * | 2021-08-27 | 2023-03-02 | 浙江大学台州研究院 | Accurate revolving body measurement apparatus and measurement method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2164542Y (en) * | 1993-07-08 | 1994-05-11 | 大连理工大学 | Measurer for solid of revolution |
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2009
- 2009-06-16 CN CN2009101483287A patent/CN101571378B/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102141393A (en) * | 2010-12-28 | 2011-08-03 | 神龙汽车有限公司 | Method for detecting deviation of shaft-like part from reference gravity center line on basis of gas suspension and three-dimensional coordinate and gas suspension device |
| CN102355553A (en) * | 2011-10-11 | 2012-02-15 | 陈博威 | Method for realizing light shadow calligraphic work |
| CN103063109A (en) * | 2012-12-27 | 2013-04-24 | 贵州黎阳航空动力有限公司 | Limiting axial wall thickness dimensional measurement method of variable cross-section inner cavity revolution body |
| CN103063109B (en) * | 2012-12-27 | 2016-07-06 | 贵州黎阳航空动力有限公司 | The spacing axial wall thickness dimension measuring method of variable cross-section inner cavity revolution body |
| CN110500950A (en) * | 2018-05-16 | 2019-11-26 | Juki株式会社 | Check device |
| CN113052787A (en) * | 2019-12-27 | 2021-06-29 | 中核北方核燃料元件有限公司 | Automatic identification device and method for riser of ball blank |
| CN111678476A (en) * | 2020-06-12 | 2020-09-18 | 西安中科微精光子制造科技有限公司 | Method for measuring direction and spatial position of rotation center of rotating shaft |
| CN111678476B (en) * | 2020-06-12 | 2021-09-17 | 西安中科微精光子制造科技有限公司 | Method for measuring direction and spatial position of rotation center of rotating shaft |
| WO2023024333A1 (en) * | 2021-08-27 | 2023-03-02 | 浙江大学台州研究院 | Accurate revolving body measurement apparatus and measurement method |
| CN114894134A (en) * | 2022-05-20 | 2022-08-12 | 成都飞机工业（集团）有限责任公司 | Method, device, equipment and medium for measuring space size of rotary part |
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| CN101571378B (en) | 2011-05-04 |
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