CN105458833A - Workpiece rotating center measuring device and method - Google Patents

Workpiece rotating center measuring device and method Download PDF

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Publication number
CN105458833A
CN105458833A CN201510890609.5A CN201510890609A CN105458833A CN 105458833 A CN105458833 A CN 105458833A CN 201510890609 A CN201510890609 A CN 201510890609A CN 105458833 A CN105458833 A CN 105458833A
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CN
China
Prior art keywords
workpiece
data
image
rotating center
feature die
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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CN201510890609.5A
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Chinese (zh)
Inventor
姚必计
谭辉
王海彬
袁古兴
黄庆探
邱焓
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CHONGQING ZHENCE SCIENCE AND TECHNOLOGY Co Ltd
Chongqing University
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CHONGQING ZHENCE SCIENCE AND TECHNOLOGY Co Ltd
Chongqing University
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Application filed by CHONGQING ZHENCE SCIENCE AND TECHNOLOGY Co Ltd, Chongqing University filed Critical CHONGQING ZHENCE SCIENCE AND TECHNOLOGY Co Ltd
Priority to CN201510890609.5A priority Critical patent/CN105458833A/en
Publication of CN105458833A publication Critical patent/CN105458833A/en
Pending legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23QDETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q17/00Arrangements for observing, indicating or measuring on machine tools
    • B23Q17/24Arrangements for observing, indicating or measuring on machine tools using optics or electromagnetic waves
    • B23Q17/2409Arrangements for indirect observation of the working space using image recording means, e.g. a camera
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23QDETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q17/00Arrangements for observing, indicating or measuring on machine tools
    • B23Q17/22Arrangements for observing, indicating or measuring on machine tools for indicating or measuring existing or desired position of tool or work
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23QDETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q17/00Arrangements for observing, indicating or measuring on machine tools
    • B23Q17/24Arrangements for observing, indicating or measuring on machine tools using optics or electromagnetic waves
    • B23Q17/2428Arrangements for observing, indicating or measuring on machine tools using optics or electromagnetic waves for measuring existing positions of tools or workpieces

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)

Abstract

The invention discloses a workpiece rotating center measuring device. The device comprises a characteristic die, a data monitoring device and a central control device. In the working process, a controller controls an image collecting device to collect images of the characteristic die and a measured workpiece, transmits the images to a data processing device to be stored and then controls the measured workpiece to rotate; a data collecting device begins to collect data of the measured workpiece, and meanwhile, the image collecting device collects the images at the same time, and through multi-time image collection and data collection, the data processing device carries out analysis comparison and processing on the images and data obtained multiple times; finally, the workpiece rotating center is found, and the aim of measuring the workpiece rotating center is achieved, so that the quality of a CT image is effectively improved. The invention further discloses a workpiece rotating center measuring method. Through workpiece rotating center data collection and calculation processing, the relatively-accurate rotating center of the workpiece is finally obtained, and the image of the CT image is effectively improved.

Description

A kind of rotating center sensing equipment and method
Technical field
The present invention relates to Industrial Computed Tomography field, particularly relate to a kind of rotating center sensing equipment and method.
Background technology
In industrial CT system, the accurate measurement of rotating center position is most important.In theory, the line of ray source focus and pivot should perpendicular to detector light receiving surface, and to should the central pixel point of receiving surface.In reality detects, even if the pivot measured and actual pivot exist small deviation, also can make reconstruction anamorphose or produce artifact.
The determinator of existing pivot or method mainly comprise the direct method of measurement, model tuning method and symmetric relation method.The direct method of measurement is the pivot of radiographic source, detector and turntable by directly measuring CT, thus determines the projection rotating center of workpiece at detector, and due to the restriction of certainty of measurement, the feasibility of practical application is not high; Model tuning rule adopts special calibration model, first scans calibration model, calculates and determines pivot, then scan measured workpiece, uses the pivot data of special correcting circuit model measurement gained to correct the measurement data of measured workpiece; Symmetric relation method etc. is the symmetry utilizing CT initial data to exist, and by algebraic operation, determines pivot.
Said method weak point is only to carry out measuring or correcting for the changeless situation of rotating center, is not suitable for the situation that rotating center in CT scan constantly changes.
Therefore, how solving industrial CT system because of rotating center can not measure, or the pivot measured and the excessive and problem of the CT image quality decrease caused of actual pivot deviation, is the technical problem that those skilled in the art need solution badly.
Summary of the invention
In view of this, the object of this invention is to provide a kind of rotating center sensing equipment, effectively can measure the pivot of workpiece, thus CT picture quality is effectively improved.Present invention also offers a kind of rotating center assay method, utilize the collection to rotating center data and computing, final workpiece pivot comparatively accurately, is effectively improved to make CT picture quality.
For solving the problems of the technologies described above, the invention provides a kind of rotating center sensing equipment, comprising:
Feature die, described feature die surface is provided with high-contrast pattern, and described feature die is affixed is arranged at workpiece end face;
Data monitoring device, described data monitoring device comprises and is arranged at the image gathering device of described feature die right opposite and the transacter for detecting described workpiece;
CCU, described CCU is connected with described data monitoring device; Described CCU comprises controller and data processing equipment.
Preferably, described image gathering device is video camera.
Preferably, described transacter comprises the radiographic source that is arranged on the described workpiece left and right sides and the detector for receiving described radiogenic ray signal.
Preferably, described data processing equipment is computer.
A kind of rotating center assay method, is applied to the rotating center sensing equipment described in above any one, comprises step:
1) workpiece end face is positioned over by affixed for feature die;
2) controller control data monitoring device carries out collecting the image of workpiece and data;
3) image that captures data monitoring device of data processing equipment and data carry out checking computations and spanned file.
Wherein, described step 2 comprises step:
21) when workpiece is static, image gathering device carries out an IMAQ to workpiece, and is sent to data processing equipment;
22) rotational workpieces, control device control data gathering-device carries out sampling to the virtual data of workpiece, and carries out the collection to workpiece image in this control image gathering device.
Wherein, described step 3 comprises step:
31) centre coordinate of feature die is extracted as reference coordinate O 1; Setting workpiece actual pivot coordinate O;
32) reference coordinate O is recorded 1with practical center coordinate O position deviation relation between the two, record specific indexing position P 1p 2p nunder image process;
33) centre coordinate O when feature die rotates is obtained 2o 3o n-1o n, the actual pivot O ' of workpiece 2o ' 3o ' n-1o ' nthe centre coordinate being converted into feature die can be calculated one by one;
34) rotating center O ' is recorded 2o ' 3o ' n-1o ' ncoordinate and indexing position information, Survival data file.
Rotating center sensing equipment provided by the present invention, has additional feature die, data detection device and CCU, and described feature die is provided with high contrast patterns, and the affixed end face being arranged at measured workpiece; Data detection device comprises image gathering device and transacter, image gathering device is arranged at the right opposite of feature die, and feature die and measured workpiece are carried out to the collection of image, and transacter is for collecting measured workpiece data when rotated; CCU comprises controller for controlling image gathering device and transacter work and for analyzing and processing the image and data that image gathering device and transacter transmit.In the course of the work, controller controls the image collection of image gathering device to feature die and measured workpiece, and be transferred to data processing equipment to store, then control measured workpiece to rotate, transacter starts to collect the data of measured workpiece, image gathering device is also collected image simultaneously simultaneously, by image collection repeatedly and Data Collection, data processing equipment is to image repeatedly and data analysis comparison and process, finally find the pivot of workpiece, this just reaches the object of the pivot measuring workpiece, thus also make CT picture quality effectively be improved.
Present invention also offers a kind of rotating center assay method, utilize the collection to rotating center data and computing, final workpiece pivot comparatively accurately, is effectively improved to make CT picture quality.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention, simple introduction is done below by the accompanying drawing used required in embodiment, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is rotating center sensing equipment structural representation provided by the present invention;
Fig. 2 is rotating center assay method flow chart provided by the present invention.
In accompanying drawing, 1 is feature die, and 21 is video camera, and 22 is transacter, and 221 is radiographic source, and 222 is detector, and 223 is ray signal, and 3 is CCU, and 31 is controller, and 32 is computer, and 4 is workpiece.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art are not making under creative work prerequisite, and the every other embodiment obtained, all belongs to scope.
In order to make those skilled in the art person understand the present invention program better, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Please refer to Fig. 1 and Fig. 2, Fig. 1 is rotating center sensing equipment structural representation provided by the present invention; Fig. 2 is rotating center assay method flow chart provided by the present invention.
The utility model provides a kind of rotating center sensing equipment, comprising:
Feature die 1, described feature die 1 surface is provided with high-contrast pattern, and described feature die 1 is affixed is arranged at workpiece 4 end face;
Data monitoring device, described data monitoring device comprises and is arranged at the image gathering device of described feature die 1 right opposite and the transacter 22 for detecting described workpiece 4;
CCU 3, described CCU 3 is connected with described data monitoring device; Described CCU 3 comprises controller 31 and data processing equipment.
Have additional feature die 1, data detection device and CCU 3, described feature die 1 is provided with high contrast patterns, and the affixed end face being arranged at measured workpiece 4; Data detection device comprises image gathering device and transacter 22, image gathering device is arranged at the right opposite of feature die 1, and feature die 1 and measured workpiece 4 are carried out to the collection of image, and transacter 22 is for collecting measured workpiece 4 data when rotated; CCU 3 comprises for controlling controller 31 that image gathering device and transacter 22 work and for analyzing and processing the image and data that image gathering device and transacter 22 transmit.In the course of the work, controller 31 controls the image collection of image gathering device to feature die 1 and measured workpiece 4, and be transferred to data processing equipment to store, then control measured workpiece 4 to rotate, transacter 22 starts to collect the data of measured workpiece 4, image gathering device is also collected image simultaneously simultaneously, by image collection repeatedly and Data Collection, data processing equipment is to image repeatedly and data analysis comparison and process, finally find the pivot of workpiece 4, this just reaches the object of the pivot measuring workpiece 4, thus also make CT picture quality effectively be improved.
In the present invention one specific embodiment, described image gathering device is video camera 21.Video camera 21 is image gathering device common in daily life, has and obtains conveniently, advantage simple to operate.Certainly, video camera 21 can also be replaced with camera, therefore in the present embodiment, this not limited.
In order to optimize above-described embodiment further, described transacter 22 comprises the radiographic source 221 that is arranged on described workpiece 4 left and right sides and the detector 222 for the ray signal 223 that receives described radiographic source 221.Radiographic source 221 is irradiated on workpiece 4 by divergent-ray signal 223, penetrate workpiece 4, according to each the difference of partial density of workpiece 4, the energy attenuation of ray just has difference, detector 222 can catch the dampening information of ray, finally be transferred to transacter 22, transacter 22 obtains the image of workpiece 4 cutting plane by the image processing method of mathematics by the information that transmits.
Further again, described data processing equipment is computer 32.Computer 32 has comparatively powerful data processing function, and can be figure by the data transformations after process, shows.
Wherein, the connected mode of video camera 21 and computer 32 has a variety of, in the present embodiment, preferably adopts the connected mode of Ethernet.
Present invention also offers a kind of rotating center assay method, be applied to the rotating center sensing equipment in technique scheme described in any one, comprise step:
1) workpiece end face is positioned over by affixed for feature die;
2) controller control data monitoring device carries out collecting the image of workpiece and data;
3) image that captures data monitoring device of data processing equipment and data carry out checking computations and spanned file.
Wherein, feature die 1 is provided with high-contrast pattern.Described feature die 1 is the disk of white background, and white background draws an equilateral triangle, and its central point is labeled as O 1, leg-of-mutton border calculates the foundation of rotary middle point as image procossing.
In the course of the work, first controller 31 controls image gathering device and once gathers before workpiece 4 does not rotate, then start working at control data gathering-device 22, after gathering-device is started working, workpiece 4 rotates with certain speed, carry out gathering the data of the workpiece 4 in rotation, image gathering device also gathers the workpiece 4 in rotation simultaneously.The image that data processing equipment captures data monitoring device and data check last spanned file and utilize collection to workpiece 4 pivot data and computing, finally obtain workpiece 4 pivot comparatively accurately, be effectively improved to make CT picture quality.
In the present invention one specific embodiment, described step 2 comprises step:
21) when workpiece is static, image gathering device carries out an IMAQ to workpiece, and is sent to data processing equipment;
22) rotational workpieces, control device control data gathering-device carries out sampling to the virtual data of workpiece, and carries out the collection to workpiece image in this control image gathering device.
In order to optimize above-described embodiment further, described step 3 comprises step:
31) centre coordinate of feature die is extracted as reference coordinate O 1; Setting workpiece actual pivot coordinate O;
32) reference coordinate O is recorded 1with practical center coordinate O position deviation relation between the two, record specific indexing position P 1p 2p nunder image process;
33) centre coordinate O when feature die rotates is obtained 2o 3o n-1o n, the actual pivot O ' of workpiece 2o ' 3o ' n-1o ' nthe centre coordinate being converted into feature die 1 can be calculated one by one;
34) rotating center O ' is recorded 2o ' 3o ' n-1o ' ncoordinate and indexing position information, generate data file.
Wherein, data specifically process computational methods can reference:
Computer 32 is by image processing method, and extract the centre coordinate of feature die 1, before being started working by transacter 22, the centre coordinate of feature die 1 is labeled as reference coordinate O 1, the actual pivot coordinate of workpiece 4 is O, and under the same coordinate system, record position deviation relation between the two, by the specific indexing position P caught in transacter 22 course of work 1p 2p nunder image process, obtain the center O during rotation of feature die 1 2o 3o n-1o n, because feature die 1 is fixedly mounted on workpiece 4 surface, therefore the center of feature die 1 and the pivot deviation of workpiece 4 are fixed, O 2o 3o n-1o nfor the pivot of feature die 1, O ' 2o ' 3o ' n-1o ' nfor the actual pivot of workpiece 4;
With O 1for initial point, OO 1for x-axis, through initial point O 1and and OO 1vertical direction is y-axis, sets up plane coordinate system, without loss of generality, and P 2the center O of the feature die 1 of indexing position 2coordinate (x 1, y 1) can be expressed as:
Wherein, ρ 1for O 1o 2the distance of point-to-point transmission, θ 1for O 1o 2with the angle of x-axis;
ρ 1with θ 1the image that can transmit according to video camera 21, by image procossing and calculating, feature die 1 centre coordinate of other indexing positions also adopts method for expressing as above;
Further, the actual pivot O ' of workpiece 4 2o ' 3o ' n-1o ' nthe centre coordinate of feature die 1 can be converted into one by one, P 2the actual pivot coordinate of workpiece 4 of indexing position just can be expressed as:
Wherein d is OO 1between distance;
Finally, the form of the coordinate file record of workpiece 4 pivot of indexing position information is comprised for (P 1, x ' 1, y ' 1) (P 2, x ' 2, y " 2) ... (P n, x ' n, y ' n), obtain actual workpiece 4 accurately pivot position by reading this file during CT image reconstruction.
In sum, rotating center sensing equipment provided by the present invention, has additional feature die 1, data detection device and CCU 3, and described feature die 1 is provided with high contrast patterns, and the affixed end face being arranged at measured workpiece 4; Data detection device comprises image gathering device and transacter 22, image gathering device is arranged at the right opposite of feature die 1, and feature die 1 and measured workpiece 4 are carried out to the collection of image, and transacter 22 is for collecting measured workpiece 4 data when rotated; CCU 3 comprises for controlling controller 31 that image gathering device and transacter 22 work and for analyzing and processing the image and data that image gathering device and transacter 22 transmit.In the course of the work, controller 31 controls the image collection of image gathering device to feature die 1 and measured workpiece 4, and be transferred to data processing equipment to store, then control measured workpiece 4 to rotate, transacter 22 starts to collect the data of measured workpiece 4, image gathering device is also collected image simultaneously simultaneously, by image collection repeatedly and Data Collection, data processing equipment is to image repeatedly and data analysis comparison and process, finally find the pivot of workpiece 4, this just reaches the object of the pivot measuring workpiece 4, thus also make CT picture quality effectively be improved.
Present invention also offers a kind of rotating center assay method, utilize the collection to workpiece 4 pivot data and computing, final workpiece 4 pivot comparatively accurately, is effectively improved to make CT picture quality.
Above a kind of rotating center sensing equipment provided by the present invention and method are described in detail.Apply specific case herein to set forth principle of the present invention and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improve and modify and also fall in the protection domain of the claims in the present invention.

Claims (7)

1. a rotating center sensing equipment, is characterized in that, comprising:
Feature die (1), described feature die (1) surface is provided with high-contrast pattern, and described feature die (1) is affixed is arranged at workpiece (4) end face;
Data monitoring device, described data monitoring device comprises the image gathering device that is arranged at described feature die (1) right opposite and the transacter (22) for detecting described workpiece (4);
CCU (3), described CCU (3) is connected with described data monitoring device; Described CCU (3) comprises controller (31) and data processing equipment.
2. rotating center sensing equipment as claimed in claim 1, it is characterized in that, described image gathering device is video camera (21).
3. instrument pivot sensing equipment as claimed in claim 2, it is characterized in that, described transacter (22) comprises the radiographic source (221) that is arranged on described workpiece (4) left and right sides and the detector (222) for the ray signal (223) that receives described radiographic source (221).
4. instrument pivot sensing equipment as claimed in claim 3, it is characterized in that, described data processing equipment is computer (32).
5. a rotating center assay method, is applied to the rotating center sensing equipment of the claim of above 1-4 any one, it is characterized in that, comprise step:
1) workpiece end face is positioned over by affixed for feature die;
2) controller control data monitoring device carries out collecting the image of workpiece and data;
3) image that captures data monitoring device of data processing equipment and data carry out checking computations and spanned file.
6. rotating center assay method as claimed in claim 5, is characterized in that, described step 2) comprise step:
21) when workpiece is static, image gathering device carries out an IMAQ to workpiece, and is sent to data processing equipment;
22) rotational workpieces, control device control data gathering-device carries out sampling to the virtual data of workpiece, and carries out the collection to workpiece image in this control image gathering device.
7. rotating center assay method as claimed in claim 6, is characterized in that, described step 3) comprise step:
31) centre coordinate of feature die is extracted as reference coordinate O 1; Setting workpiece actual pivot coordinate O;
32) reference coordinate O is recorded 1with practical center coordinate O position deviation relation between the two, record specific indexing position P 1p 2p nunder image process;
33) centre coordinate O when feature die rotates is obtained 2o 3o n-1o n, the actual pivot O ' of workpiece 2o ' 3o ' n-1o ' nthe centre coordinate being converted into feature die 1 can be calculated one by one;
34) rotating center O ' is recorded 2o ' 3o ' n-1o ' ncoordinate and indexing position information, generate data file.
CN201510890609.5A 2015-12-04 2015-12-04 Workpiece rotating center measuring device and method Pending CN105458833A (en)

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Application publication date: 20160406