CN104374318A - Method for measuring surface of large mold through laser scanner - Google Patents
Method for measuring surface of large mold through laser scanner Download PDFInfo
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- CN104374318A CN104374318A CN201410640473.8A CN201410640473A CN104374318A CN 104374318 A CN104374318 A CN 104374318A CN 201410640473 A CN201410640473 A CN 201410640473A CN 104374318 A CN104374318 A CN 104374318A
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Abstract
The invention provides a method for measuring the surface of a large mold through a laser scanner. The method includes the following steps: S1, the mold is placed on a base plate for measurement; S2, three hemispherical measurement targets are placed into three basic holes in the mold respectively; S3, coding points and positioning gage points are placed in a to-be-measured area of the mold; S4, a picture is taken for the to-be-measured area of the mold through a camera device; S5, three-dimensional coordinates of the coding points and the positioning gage points in the picture are calculated; S6, a coordinate system is built with the three-dimensional coordinates of the positioning gage points in the centers of the planes of the three hemispherical measurement targets as a standard; S7, a coordinate system referred by calculating the three-dimensional coordinates of the coding points and the positioning gage points is converted into the coordinate system in the step S6, and the three-dimensional coordinates are stored; S8, the three-dimensional coordinates stored in the step S7 are led into related software of the laser scanner, and point clouds in the to-be-measured area of the mold are collected. By means of the method, the whole point cloud splicing accuracy is effectively guaranteed, and the measurement efficiency and the measurement result accuracy are improved.
Description
Technical field
The present invention relates to mould field of measuring technique, particularly relate to a kind of method of laser scanner measurement large mold surface.
Background technology
Numerous large mold is complex-shaped, difficult forming, is the machining precision controlling mould, therefore is the primary operation of carrying out part production to die surface measurement for effectively controlling one of approach of final part geometry dimensional tolerence.
At present, be limited to three coordinate measuring engine measurement scope, cannot to effective measurement of large mold.And laser scanner is with accurate, the high-precision unique advantage of its measurement, obtain application in mould fields of measurement, but when to large-scale measurement, through repeatedly station transfer, Multiple-Scan need be carried out to die surface, then by the image mosaic means of specialty, the fragment that Multiple-Scan obtains spliced, complex operation, measuring period is long, measurement efficiency is low, and higher to the requirement of operating personnel.
Summary of the invention
The problem to be solved in the present invention is when measuring large mold surface, and the measurement efficiency of current measurement means and measuring accuracy cannot meet requirement of engineering.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of method of laser scanner measurement large mold surface, comprises the following steps:
S1: be positioned over by mould on measurement substrate, makes the bottom surface of mould be in level;
S2: three hemisphere measurement target drones are placed in respectively on three datum holes on mould, make the arc surface of hemisphere measurement target drone towards datum hole, its plane is parallel with mould bottom surface, the planar central place of this hemisphere measurement target drone is provided with location punctuate, and the diameter of hemisphere measurement target drone is greater than the diameter of datum hole;
S3: place encoded point and location punctuate in the region to be measured of mould, make the distance between adjacent encoder point be 200-400mm, the distance between adjacent positioned punctuate is 30-50mm;
S4: taking pictures in the region to be measured of mould using camera installation to be placed with encoded point and location punctuate to above-mentioned and above-mentioned hemisphere measurement target drone region, obtains the photo of several mould zoness of different;
S5: utilize three-dimensional optical projection measurement system, calculates the encoded point in above-mentioned photo and the three-dimensional coordinate of locating punctuate;
S6: with the three-dimensional coordinate of the location punctuate at above-mentioned three hemisphere measurement target drone planar central places for benchmark, set up coordinate system;
S7: the coordinate system referenced by three-dimensional coordinate counted in and state encoded point and location punctuate of being fallen into a trap by step S5, converts the coordinate system described in step S6 to, and the three-dimensional coordinate of the encoded point after transformed coordinate system and location punctuate is preserved;
S8: imported in laser scanner related software by the three-dimensional coordinate of the encoded point preserved in step S7 and location punctuate, carries out the collection of putting cloud in mould region to be measured, completes the measurement to mould.
Measurement substrate described in step S1 provides measurement level reference, for the reference of die horizontal centering.
The advantage that the present invention has and good effect are:
Three-dimensional optical shadow casting technique combines with laser scanner technique by this method, for the measurement on large mold surface, the three-dimensional coordinate of the mould surface characteristics location point to be measured obtained with three-dimensional optical shadow casting technique is for benchmark, laser scanner is used mould surface to be measured to be carried out to the collection of a cloud, effectively ensure that the precision of overall some cloud, make measurement result accuracy and measure efficiency higher, when avoiding use laser scanner measurement large mold surface, station transfer is consuming time with splicing, measuring accuracy reduces problem simultaneously.
Accompanying drawing explanation
Fig. 1 is the mould schematic diagram in the specific embodiment of the invention.
Fig. 2 is the hemisphere measurement target drone schematic diagram in the specific embodiment of the invention.
In figure:
1-measurement substrate; 2-mould; 3-blank holder; 4-hemisphere measurement target drone; 5-counterdie matrix.
Embodiment
Below to be with the mould of blank holder, a kind of method of laser scanner measurement large mold surface is described in detail; In this particular embodiment, mould 2 comprises counterdie matrix 5 and blank holder 3, the bottom surface of counterdie matrix 5 and the bottom surface of mould 2, the datum hole on the datum hole on blank holder 3 and mould 2.This method comprises the following steps:
S1: be positioned on measurement substrate 1 by mould 2, makes the bottom surface of counterdie matrix 5 be in level;
S2: be hemisphere measurement target drone 4 diameter be placed in respectively on blank holder 3 of 35mm by diameter be on three datum holes of 20mm, make the arc surface of hemisphere measurement target drone 4 towards datum hole, its plane is parallel with the bottom surface of counterdie matrix 5, then datum hole blocks by hemisphere measurement target drone 4 completely, and the planar central place of this hemisphere measurement target drone 4 is provided with location punctuate;
S3: place encoded point and location punctuate in the region to be measured of mould 2, make the distance between adjacent encoder point be 200-400mm, the distance between adjacent positioned punctuate is 30-50mm;
S4: taking pictures in the region to be measured of mould 2 using camera installation to be placed with encoded point and location punctuate to above-mentioned and hemisphere measurement target drone 4 region, obtains the photo of several mould 2 zoness of different;
S5: utilize three-dimensional optical projection measurement system, calculates the encoded point on above-mentioned photo and the three-dimensional coordinate of locating punctuate;
S6: with the three-dimensional coordinate of the location punctuate at above-mentioned three hemisphere measurement target drone 4 planar central places for benchmark, set up coordinate system WCS;
S7: step S5 is fallen into a trap and counts the reference frame of the three-dimensional coordinate stating encoded point and location punctuate in, convert the coordinate system WCS described in step S6 to, and the three-dimensional coordinate of the encoded point after transformed coordinate system and location punctuate is preserved;
S8: imported in laser scanner related software by the three-dimensional coordinate of the encoded point preserved in step S7 and location punctuate, carries out the collection of putting cloud in mould 2 region to be measured, completes the measurement to mould 2.
Above embodiments of the invention have been described in detail, but described content being only preferred embodiment of the present invention, can not being considered to for limiting practical range of the present invention.All equalizations done according to the scope of the invention change and improve, and all should still belong within this patent covering scope.
Claims (2)
1. the method on laser scanner measurement automobile panel surface, is characterized in that: comprise the following steps:
S1: be positioned on measurement substrate (1) by mould (2), makes the bottom surface of mould (2) be in level;
S2: three hemisphere measurement target drones (4) are placed in respectively on three datum holes on mould (2), make the arc surface of hemisphere measurement target drone (4) towards datum hole, its plane is parallel with mould (2) bottom surface, the planar central place of this hemisphere measurement target drone (4) is provided with location punctuate, and the diameter of hemisphere measurement target drone (4) is greater than the diameter of datum hole;
S3: place encoded point and location punctuate in the region to be measured of mould (2), make the distance between adjacent encoder point be 200-400mm, the distance between adjacent positioned punctuate is 30-50mm;
S4: taking pictures in the region to be measured of mould (2) using camera installation to be placed with encoded point and location punctuate to above-mentioned and above-mentioned hemisphere measurement target drone (4) region, obtains the photo of several moulds (2) zones of different;
S5: utilize three-dimensional optical projection measurement system, calculates the encoded point in above-mentioned photo and the three-dimensional coordinate of locating punctuate;
S6: with the three-dimensional coordinate of the location punctuate at the planar central place of above-mentioned three hemisphere measurement target drones (4) for benchmark, set up coordinate system;
S7: step S5 is fallen into a trap count in and state encoded point and the coordinate system referenced by the punctuate three-dimensional coordinate of location, convert the coordinate system described in step S6 to, and the three-dimensional coordinate of the encoded point after transformed coordinate system and location punctuate is preserved;
S8: imported in laser scanner related software by the three-dimensional coordinate of the encoded point preserved in step S7 and location punctuate, carries out the collection of putting cloud in mould (2) region to be measured, completes the measurement to mould (2).
2. measuring method according to claim 1, is characterized in that: the measurement substrate (1) described in step S1 provides measurement level reference, for the reference of mould (2) horizontal centering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410640473.8A CN104374318A (en) | 2014-11-13 | 2014-11-13 | Method for measuring surface of large mold through laser scanner |
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| CN201410640473.8A CN104374318A (en) | 2014-11-13 | 2014-11-13 | Method for measuring surface of large mold through laser scanner |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017128885A1 (en) * | 2016-01-28 | 2017-08-03 | 江苏理工学院 | Device for measuring carbon fiber composite vehicle bodies |
| CN109146992A (en) * | 2018-08-24 | 2019-01-04 | 吴玉新 | A kind of method and device that tomoscan plane is reappeared |
| CN109781029A (en) * | 2019-03-08 | 2019-05-21 | 苏州玻色智能科技有限公司 | A kind of product measurement three-dimensional data joining method |
| CN110270863A (en) * | 2018-03-16 | 2019-09-24 | 天津普信模具有限公司 | A kind of localization method of machining center of automobile die cast |
| CN113432548A (en) * | 2021-06-04 | 2021-09-24 | 中兵勘察设计研究院有限公司 | Three-dimensional scanning and photogrammetry integrated control device and control method |
| CN113701626A (en) * | 2021-08-10 | 2021-11-26 | 哈尔滨岛田大鹏工业股份有限公司 | 3D machine vision detection method for automobile longitudinal beam |
| CN114111685A (en) * | 2021-11-19 | 2022-03-01 | 华能国际电力股份有限公司 | Turbine blade measuring method |
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| JP2012145381A (en) * | 2011-01-07 | 2012-08-02 | Toyota Central R&D Labs Inc | Three-dimensional coordinate measurement device |
| JP2013122434A (en) * | 2011-12-12 | 2013-06-20 | Itt:Kk | Three-dimensional shape position measuring device by monocular camera using laser, method for measuring three-dimensional shape position, and three-dimensional shape position measuring program |
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| CN1888991A (en) * | 2006-07-17 | 2007-01-03 | 四川东风电机厂有限公司 | Through-flow type guide blade body mating surface working process parameter calculating method |
| CN101995219A (en) * | 2010-11-05 | 2011-03-30 | 天津工业大学 | Three-point coding mark point based method for measuring key points of vehicle frame |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017128885A1 (en) * | 2016-01-28 | 2017-08-03 | 江苏理工学院 | Device for measuring carbon fiber composite vehicle bodies |
| CN110270863A (en) * | 2018-03-16 | 2019-09-24 | 天津普信模具有限公司 | A kind of localization method of machining center of automobile die cast |
| CN109146992A (en) * | 2018-08-24 | 2019-01-04 | 吴玉新 | A kind of method and device that tomoscan plane is reappeared |
| CN109781029A (en) * | 2019-03-08 | 2019-05-21 | 苏州玻色智能科技有限公司 | A kind of product measurement three-dimensional data joining method |
| CN113432548A (en) * | 2021-06-04 | 2021-09-24 | 中兵勘察设计研究院有限公司 | Three-dimensional scanning and photogrammetry integrated control device and control method |
| CN113701626A (en) * | 2021-08-10 | 2021-11-26 | 哈尔滨岛田大鹏工业股份有限公司 | 3D machine vision detection method for automobile longitudinal beam |
| CN113701626B (en) * | 2021-08-10 | 2023-08-04 | 哈尔滨岛田大鹏工业股份有限公司 | Automobile longitudinal beam 3D machine vision detection method |
| CN114111685A (en) * | 2021-11-19 | 2022-03-01 | 华能国际电力股份有限公司 | Turbine blade measuring method |
| CN114111685B (en) * | 2021-11-19 | 2023-09-01 | 华能国际电力股份有限公司 | Turbine blade measurement method |
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