CN109685744B - Scanning galvanometer precision correction method - Google Patents
Scanning galvanometer precision correction method Download PDFInfo
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- CN109685744B CN109685744B CN201811653094.7A CN201811653094A CN109685744B CN 109685744 B CN109685744 B CN 109685744B CN 201811653094 A CN201811653094 A CN 201811653094A CN 109685744 B CN109685744 B CN 109685744B
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000013598 vector Substances 0.000 claims abstract description 19
- 239000011159 matrix material Substances 0.000 claims abstract description 6
- 238000005259 measurement Methods 0.000 abstract description 2
- 238000004364 calculation method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 239000002184 metal Substances 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 1
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Classifications
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- G06T5/80—
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/30—Process control
- B22F10/31—Calibration of process steps or apparatus settings, e.g. before or during manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F12/00—Apparatus or devices specially adapted for additive manufacturing; Auxiliary means for additive manufacturing; Combinations of additive manufacturing apparatus or devices with other processing apparatus or devices
- B22F12/40—Radiation means
- B22F12/49—Scanners
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/20—Direct sintering or melting
- B22F10/28—Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/10—Image acquisition modality
- G06T2207/10004—Still image; Photographic image
- G06T2207/10008—Still image; Photographic image from scanner, fax or copier
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention discloses a scanning galvanometer precision correction method, which comprises the following stepsPrinting a circular array on a prepared standard correction plate in advance, and marking a cross line in the circular array; converting the coordinates of the center O 'of the cross marking line according to the coordinates O of the circle center, and taking the vector OO' as the deviation between the circle center and the center of the cross marking line; searching the (n +1, m + 1) th circle center, measuring the deviation coordinate O ' of the circle center O to obtain the deviation vector OO ' of the circle center O and subtracting the deviation vector OO ' in the subsequent processing of all points; the coordinates of the midpoint of the (n ', m ') th cross mark line are (n ' × d, m ' × d) + OO ' + OO nm '; sequentially processing the coordinates of the middle points of other cross mark lines, and calculating the deviation vector between the coordinates and the corresponding circle center; and obtaining a matrix table of the coordinate deviation of the midpoint of each cross mark line. The invention solves the problem of insufficient point-lifting precision when the scanner scans images for distance measurement in the prior art.
Description
Technical Field
The invention belongs to the technical field of metal powder laser melting additive manufacturing, and particularly relates to a scanning galvanometer precision correction method.
Background
The metal powder laser melting additive manufacturing technology can form metal parts with higher complexity and accuracy. In the existing metal powder laser melting additive manufacturing technology, a galvanometer is mostly adopted as light path control equipment. The field lens is used as a device for collecting laser, barrel-shaped distortion exists in principle, precision drift can occur after the field lens is used for a period of time after the field lens is corrected, and the field lens needs to be corrected again. When a scanner is used for scanning an image for ranging, the image deformation often occurs, so that the lifting point precision is reduced or the deformation problem still exists after correction. The high-precision imager can solve the problem of insufficient point-lifting precision, but is inconvenient to use in a customer site.
Disclosure of Invention
The invention aims to provide a scanning galvanometer precision correction method, which solves the problem of insufficient point extraction precision when a scanner scans images for distance measurement in the prior art.
The technical scheme adopted by the invention is that a scanning galvanometer precision correction method is implemented according to the following steps:
step 3, setting the center of each independent circle as O and the center of the cross marking line as O ', and converting the coordinates of the center O ' of the cross marking line according to the coordinates of the center of the circle O so as to avoid errors generated in the scanning process of the scanner, and taking the vector OO ' as the deviation between the center of the circle and the center of the cross marking line;
step 4, searching a circle with the position at the center, namely the (n +1, m + 1) th circle center of the circular array, setting the center circular coordinate point as (0,0), measuring the deviation coordinate O ' of the circle center O to obtain the deviation vectors OO ' of the circle center O and the circle center O, and subtracting the deviation vectors OO ' in the subsequent processing of all the points;
and 5, regarding the (n ', m ') th circle, the coordinate of the center of the circle is (n ' × d, m ' × d), and the coordinate of the midpoint of the (n ', m ') th cross mark line is (n ' × d, m ' × d) + OO ' + OO nm ’；
Step 6, sequentially processing the coordinates of the middle points of other cross mark lines, and calculating the coordinates and the corresponding circle center to obtain a deviation vector; and obtaining a matrix table of the point coordinate deviation of each cross mark line, and further correcting the field lens deviation.
The present invention is also characterized in that,
in step 1 n =5,m =5.
In step 1 d =5.
The scanning galvanometer precision correction method has the advantages that the circular array correction plate is used for correction, and the calculation is carried out while scanning during correction, so that the calculation precision is improved, and the calculation speed is improved. The obtained deviation matrix can be used for correcting the deviation of the field lens, so that the problem of insufficient precision of point lifting at present is solved, and the problem of inconvenient point lifting of a high-precision imager at a customer site is solved.
Drawings
FIG. 1 is a flow chart of a scanning galvanometer precision correction method of the present invention;
FIG. 2 is a schematic diagram of a standard calibration plate in the method for calibrating scanning galvanometer precision of the present invention;
FIG. 3 is a schematic diagram of a standard calibration plate after cross line marking in the scanning galvanometer precision calibration method of the present invention;
FIG. 4 is a schematic diagram of a (0,0) point deviation vector in a coordinate system in a scanning galvanometer precision correction method according to the present invention;
FIG. 5 is a schematic diagram of the deviation vector of the (n ', m') point in the coordinate system in the scanning galvanometer precision correction method of the present invention;
FIG. 6 is a schematic diagram of the global deviation vectors of all coordinate points in the scanning galvanometer precision correction method of the present invention.
In the figure, 1. Standard calibration plate.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention discloses a scanning galvanometer precision correction method, which is implemented by the following steps as shown in a flow chart shown in figure 1:
wherein n =5,m =5,d =5.
step 3, setting the center of each independent circle as O and the center of the cross marking line as O ', and converting the coordinates of the center O ' of the cross marking line according to the coordinates of the center of the circle O so as to avoid errors generated in the scanning process of the scanner, and taking the vector OO ' as the deviation between the center of the circle and the center of the cross marking line;
step 4, searching for a circle with the position at the center, namely the (n +1, m + 1) th circle center of the circular array, as shown in fig. 4, setting the center circular coordinate point as (0,0), measuring the deviation coordinate O 'of the circle center O to obtain the deviation vector OO' of the circle center O and the circle center O ', and subtracting the deviation vector OO' in the subsequent processing of all the points;
step 5, regarding the (n ', m ') th circle, as shown in fig. 5, the coordinates of the center of the circle are (n ' × d, m ' × d), and the coordinates of the midpoint of the (n ', m ') th cross mark line are (n ' × d, m ' × d) + OO ' + OO nm ’；
Step 6, sequentially processing the coordinates of the middle points of other cross mark lines, and calculating the coordinates and the corresponding circle center to obtain a deviation vector; a matrix table of the point coordinate deviations in each crosshair mark line is obtained as shown in table 1 and is further used to correct the field lens deviations as shown in fig. 6.
According to the scanning galvanometer precision correction method, the circular array correction plate is used for correction, and the calculation is carried out while scanning during correction, so that the calculation precision is improved, and the calculation speed is improved. The obtained deviation matrix can be used for correcting the deviation of the field lens, so that the problem of insufficient precision of point lifting at present is solved, and the problem of inconvenient point lifting of a high-precision imager at a customer site is solved.
Claims (3)
1. A scanning galvanometer precision correction method is characterized by being implemented according to the following steps:
step 1, a circular array is printed on a standard correction plate (1) which is prepared in advance, the circular array is 2n +1 rows and 2m +1 columns, n and m are integers, and the distance between two adjacent circle centers is set to be d;
step 2, marking a cross line in the circular inner part;
step 3, setting the center of each independent circle as O and the center of the cross marking line as O ', and converting the coordinates of the center O ' of the cross marking line according to the coordinates of the center of the circle O so as to avoid errors generated in the scanning process of the scanner, and taking the vector OO ' as the deviation between the center of the circle and the center of the cross marking line;
step 4, searching a circle with the position at the center, namely the (n +1, m + 1) th circle center of the circular array, setting the center circular coordinate point as (0,0), measuring the deviation coordinate O ' of the circle center O to obtain the deviation vectors OO ' of the circle center O and the circle center O, and subtracting the deviation vectors OO ' in the subsequent processing of all the points;
and 5, regarding the (n ', m ') th circle, the coordinate of the center of the circle is (n ' × d, m ' × d), and the coordinate of the midpoint of the (n ', m ') th cross mark line is (n ' × d, m ' × d) + OO ' + OO nm ’；
Step 6, sequentially processing the coordinates of the middle points of other cross mark lines, and calculating the coordinates and the corresponding circle center to obtain a deviation vector; and obtaining a matrix table of the point coordinate deviation in each cross mark line, and further correcting the field lens deviation.
2. The method for correcting the precision of the scanning galvanometer according to claim 1, wherein n =5,m =5 in step 1.
3. The method for correcting the precision of the scanning galvanometer according to claim 1, wherein d =5 in step 1.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110487180B (en) * | 2019-08-12 | 2020-12-25 | 上海理工大学 | Thermal drift measurement method for scanning galvanometer type laser processing system |
| CN111223067B (en) * | 2020-02-21 | 2023-05-26 | 成都工业学院 | Automatic alignment method for machining bridge anchorage device round hole |
| CN113310672B (en) * | 2021-07-30 | 2021-10-12 | 武汉华工激光工程有限责任公司 | Device and method for detecting repeated positioning precision of galvanometer |
| CN113793313B (en) * | 2021-09-10 | 2023-12-12 | 哈尔滨工业大学 | High-precision tool setting method and device for machining full-surface micro-pit structure of thin-wall spherical shell type micro-component |
| CN117359135B (en) * | 2023-12-08 | 2024-03-12 | 迈为技术(珠海)有限公司 | Galvanometer correction method, galvanometer correction device, computer apparatus, storage medium, and program product |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007192585A (en) * | 2006-01-17 | 2007-08-02 | Develo:Kk | Method of calibrating and producing survey unit, and method producing of device for performing moving body survey |
| CN107449374A (en) * | 2017-07-05 | 2017-12-08 | 南京航空航天大学 | The vision auxiliary laser galvanometer scanning system and its field calibration method of flexible layout |
| CN108426701A (en) * | 2017-12-27 | 2018-08-21 | 北京空间机电研究所 | A kind of discontinuous stellar camera elements of interior orientation test method of CCD device and system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007192585A (en) * | 2006-01-17 | 2007-08-02 | Develo:Kk | Method of calibrating and producing survey unit, and method producing of device for performing moving body survey |
| CN107449374A (en) * | 2017-07-05 | 2017-12-08 | 南京航空航天大学 | The vision auxiliary laser galvanometer scanning system and its field calibration method of flexible layout |
| CN108426701A (en) * | 2017-12-27 | 2018-08-21 | 北京空间机电研究所 | A kind of discontinuous stellar camera elements of interior orientation test method of CCD device and system |
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