CN107796318A - Based on the multicoat method for measuring thickness measured indirectly - Google Patents
Based on the multicoat method for measuring thickness measured indirectly Download PDFInfo
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- CN107796318A CN107796318A CN201711233327.3A CN201711233327A CN107796318A CN 107796318 A CN107796318 A CN 107796318A CN 201711233327 A CN201711233327 A CN 201711233327A CN 107796318 A CN107796318 A CN 107796318A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/06—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material
- G01B11/0616—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material of coating
- G01B11/0683—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material of coating measurement during deposition or removal of the layer
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices With Unspecified Measuring Means (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention discloses a kind of based on the multicoat method for measuring thickness measured indirectly, using a set of knockdown measuring mechanism, measuring mechanism includes measurement head, can drive the cephalomotor Multi-shaft movement mechanism of measurement and back-end data processing system；Each joint of Multi-shaft movement mechanism is provided with feedback device, for obtaining the position in each joint and the position of end measurement head launch point in real time；This method is first before product spraying, the frame of reference is established using the product or frock feature that are not sprayed onto and product threedimensional model is reconstructed, after product spraying, establish the frame of reference again using same characteristic features and threedimensional model after spray is reconstructed, the frame of reference it will be overlapped twice, the front and rear distance difference perpendicular to product surface of spraying is the thickness of coating.The present invention can adapt to big thickness, high accuracy, the non-contact measurement of a variety of similar characteristic materials.
Description
Technical field
It is particularly a kind of based on the multicoat thickness measure side measured indirectly the invention belongs to coating thickness measurement field
Method.
Background technology
Coating thickness is the important indicator for weighing coating quality, and current coating thickness measuring method includes direct thickness measuring method
With indirect thickness measuring method.
Direct thickness measuring method passes through calibrator direct measurement coating thickness, including thickness measurement with ray method, ultrasonic pachymetry, magnetic strength
Thickness measuring method, thickness measurement of eddy current method etc. are answered, its general principle is the difference by material electric conductivity itself, thermal conductivity or magnetic conductivity
To realize the measurement of thickness, general measure thickness is bigger, and precision is lower.
Similar for coating material characteristics, thickness is big, the high product of required precision, it is difficult to current direct calibrator is used,
Indirect thickness measuring method need to be used, indirect thickness measuring method is subtracting each other to obtain by geometric distance.In terms of indirect thickness measuring method, there is one
A little modes for using machinery positioning, but the mode of machinery positioning is difficult to ensure that the accuracy of positioning, is also just difficult to ensure that thickness is examined
The product of the precision of measured value, especially irregular shape.Therefore, using the method for indirect thickness measuring, it is necessary to solve resetting essence
The problem of spending.
The content of the invention
It is an object of the invention to provide a kind of based on the multicoat method for measuring thickness measured indirectly, can realize a variety of
Coating, the high accuracy non-contact of big coating layer thickness.
The technical scheme for realizing the object of the invention is：It is a kind of based on the multicoat method for measuring thickness measured indirectly, the survey
Amount method uses a set of knockdown measuring mechanism, and measuring mechanism includes measurement head, can drive the cephalomotor multiaxis fortune of measurement
Motivation structure and back-end data processing system；Each joint of Multi-shaft movement mechanism is provided with feedback device, for obtaining each pass in real time
The position of section and the position of end measurement head launch point；This method before product spraying, utilizes the product not being sprayed onto first
Or frock feature establishes the frame of reference and product threedimensional model is reconstructed, after product spraying, using same characteristic features again
Establish the frame of reference and threedimensional model after spray is reconstructed, the frame of reference will be overlapped twice, it is vertical before and after spraying
In the distance difference of product surface be the thickness of coating.
Compared with prior art, remarkable advantage of the invention is：The measuring method of the present invention can adapt to a variety of similar spies
Big thickness, high accuracy, the non-contact measurement of property material, especially adapt to the thickness measure after the secondary positioning of product.
Brief description of the drawings
Fig. 1 is measuring mechanism schematic diagram used by measuring method of the present invention.
Fig. 2 is the frame of reference schematic diagram of structure.
Fig. 3 is the frock thickness schematic diagram of measurement.
Embodiment
It is a kind of based on the multicoat method for measuring thickness measured indirectly, the measuring method employs a set of knockdown measurement
Mechanism, measuring mechanism include measurement head 2, can drive the cephalomotor Multi-shaft movement mechanism 1 of measurement and back-end data processing system
System, as shown in Figure 1；1 each joint of Multi-shaft movement mechanism is provided with feedback device, for obtaining the position and end in each joint in real time
The position of measurement head launch point；This method before product spraying, is established using the feature of product or frock 3 not being sprayed onto first
Simultaneously product threedimensional model is reconstructed for product benchmark coordinate system, after product spraying, establishes benchmark seat again using same characteristic features
Mark is and threedimensional model after spray is reconstructed, and the frame of reference will be overlapped twice, and spraying is front and rear perpendicular to product surface
Distance difference be exactly coating thickness.
The measuring method specifically includes following steps：
Step 1, reference characteristic is scanned before spraying, and product is placed into measuring mechanism measurement range before spraying, is utilized
Multi-shaft movement mechanism drives the reference characteristic that measurement head scans more than three；
Step 2, the frame of reference is established before spraying, characteristic point is fitted using the reference characteristic scanned, with wherein one
Individual characteristic point is origin, and the straight line formed using origin and other in which characteristic point is X-axis, with the plane of three characteristic points foundation
Frame of reference Frame1 is built for X/Y plane, as shown in Figure 2；The reference characteristic profile is ball-type or cube；
Step 3, product three-dimensional model reconfiguration before spraying, the three-dimensional of test product is scanned under frame of reference Frame1
Model；Ensure that reference characteristic is not sprayed onto in spraying process；
Step 4, reference characteristic scans after spraying, product is sent to after spray coating in the measuring mechanism measurement range, utilizes
Multi-shaft movement mechanism drives the reference characteristic that measurement head scans more than three；
Step 5, the frame of reference is established after spraying, using the reference characteristic fit characteristic point scanned, with one of them
Characteristic point is origin, the straight line formed using origin and other in which characteristic point as X-axis, using the plane that three characteristic points are established as
X/Y plane structure frame of reference Frame2；
Step 6, product three-dimensional model reconfiguration after spraying, the three-dimensional of test product is scanned under frame of reference Frame2
Model；
Step 7, Frame1 and Frame2 are overlapped to form FrameR, solves the front and rear threedimensional model of spraying in FrameR
Under perpendicular to sprayed surface distance difference L1、L2….Ln, the distance difference is the thickness value sprayed, as shown in Figure 3.
With reference to embodiment, the present invention is described in detail.
Embodiment
It is a kind of based on the multicoat method for measuring thickness measured indirectly with reference to Fig. 1, measuring mechanism include laser measuring head 2,
Two can be included with the cephalomotor Multi-shaft movement mechanism 1 of laser measurement and back-end data processing system, Multi-shaft movement mechanism 1
Kind form, one kind are that motor realizes automation, and one kind is unpowered servo-actuated.Multi-shaft movement mechanism can obtain the position of each axle in real time
Put, so as to calculate position of the end measurement head launch point relative to measuring coordinate system, the line laser energy that laser measuring head 2 is launched
Measured point is enough obtained relative to the position of launch point, the three-dimensional mould of test product will can be reconstructed after test product all standing
Type.Measurement result is test product point or line relative to the position under measuring coordinate system, such as (x1, y1, z1)…….(xn, yn,
zn), its measurement accuracy depends on the synthesis precision of laser measuring head 2 and Multi-shaft movement mechanism 1.
The measurement result of coating layer thickness is secondhand, and coating thickness is to spray fore-and-aft survey mechanism to measure the geometry come
Apart from its difference, the measuring method comprises the following steps：
(1) reference characteristic is scanned before spraying, and product is sent in the range of the device measuring before spraying, is moved using measurement
Mechanism drives measurement head to scan reference characteristic, and each reference characteristic can fit a characteristic point, reference characteristic profile
Can be ball-type or cube；
(2) frame of reference is established before spraying, and utilizes three characteristic point P on the product or frock scanned1、P2、P3,
With wherein 1 characteristic point P1For origin, with point of origin P1With other in which characteristic point P2The straight line P of composition1P2For X-axis, with three
The plane P that characteristic point is established1P2P3Frame of reference Frame1 is built for X/Y plane；
(3) product three-dimensional model reconfiguration before spraying, the three-dimensional mould of test product is scanned under frame of reference Frame1
Type；
(4) ensure that reference characteristic is not sprayed onto in spraying process；
(5) reference characteristic is scanned after spraying, and product is sent in the range of the device measuring after spray coating, is moved using measurement
Mechanism drives measurement head to scan reference characteristic；
(6) frame of reference is established after spraying, and utilizes the characteristic point P at least three products or frock scanned1‘、
P2’、P3', with wherein 1 characteristic point P1' it is origin, with point of origin P1' and other in which characteristic point P2' form straight line P1‘P2’
For X-axis, the plane P established with three characteristic points1‘P2’P3' build frame of reference Frame2 for X/Y plane；
(7) product three-dimensional model reconfiguration after spraying, the three-dimensional of test product is scanned under frame of reference Frame2
Model；
(8) Frame1 and Frame2 are overlapped to form FrameR, solves the front and rear threedimensional model of spraying under FrameR
Perpendicular to the distance difference L of sprayed surface1、L2….Ln, the distance difference is the thickness value sprayed.
Claims (4)
- It is 1. a kind of based on the multicoat method for measuring thickness measured indirectly, it is characterised in that the measuring method uses a set of combination The measuring mechanism of formula, measuring mechanism include measurement head, can drive the cephalomotor Multi-shaft movement mechanism of measurement and back-end data Processing system；Each joint of Multi-shaft movement mechanism is provided with feedback device, for obtaining position and the end measurement in each joint in real time The position of hair exit point；Before product spraying, benchmark is established using the product or frock feature that are not sprayed onto first for this method Simultaneously product threedimensional model is reconstructed for coordinate system, after product spraying, establishes the frame of reference and right again using same characteristic features Threedimensional model is reconstructed after spray, the frame of reference will be overlapped twice, the front and rear range difference perpendicular to product surface of spraying Value is the thickness of coating.
- It is 2. according to claim 1 based on the multicoat method for measuring thickness measured indirectly, it is characterised in that the measurement Method specifically includes following steps：Step 1, reference characteristic is scanned before spraying, and product is placed into measuring mechanism measurement range before spraying, utilizes multiaxis Motion drives the reference characteristic that measurement head scans more than three；Step 2, the frame of reference is established before spraying, and characteristic point is fitted using the reference characteristic scanned, with one of special Sign point is origin, and the straight line formed using origin and other in which characteristic point is X-axis, and the plane established using three characteristic points is XY Plane structure frame of reference Frame1；Step 3, product three-dimensional model reconfiguration before spraying, the three-dimensional mould of test product is scanned under frame of reference Frame1 Type；Ensure that reference characteristic is not sprayed onto in spraying process；Step 4, reference characteristic scans after spraying, product is sent to after spray coating in the measuring mechanism measurement range, utilizes multiaxis Motion drives the reference characteristic that measurement head scans more than three；Step 5, the frame of reference is established after spraying, and characteristic point is fitted using the reference characteristic scanned, with one of special Sign point is origin, and the straight line formed using origin and other in which characteristic point is X-axis, and the plane established using three characteristic points is XY Plane structure frame of reference Frame2；Step 6, product three-dimensional model reconfiguration after spraying, the three-dimensional mould of test product is scanned under frame of reference Frame2 Type；Step 7, Frame1 and Frame2 are overlapped to form FrameR, it is sagging in FrameR solves the front and rear threedimensional model of spraying Directly in the distance difference of sprayed surface, the distance difference is the thickness value sprayed.
- It is 3. according to claim 2 based on the multicoat method for measuring thickness measured indirectly, it is characterised in that the benchmark Characteristic shape is ball-type or cube.
- It is 4. according to claim 1 or 2 based on the multicoat method for measuring thickness measured indirectly, it is characterised in that described Measurement head is laser measuring head or blue light measurement head.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711233327.3A CN107796318A (en) | 2017-11-30 | 2017-11-30 | Based on the multicoat method for measuring thickness measured indirectly |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109579760A (en) * | 2018-11-22 | 2019-04-05 | 北京航天计量测试技术研究所 | A kind of measurement method of shaped face heat shield molding thickness |
| CN112964212A (en) * | 2021-03-29 | 2021-06-15 | 广船国际有限公司 | Coating thickness detector and coating thickness detection method |
| CN113721233A (en) * | 2021-08-30 | 2021-11-30 | 中国航发沈阳黎明航空发动机有限责任公司 | Three-dimensional optical measurement method for thermal barrier coating thickness of guide blade of multi-connected turbine |
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| CN106441177A (en) * | 2016-11-03 | 2017-02-22 | 北京声华兴业科技有限公司 | A method and device for measuring the thickness of a workpiece in a manner of being capable of passing through coating |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109579760A (en) * | 2018-11-22 | 2019-04-05 | 北京航天计量测试技术研究所 | A kind of measurement method of shaped face heat shield molding thickness |
| CN112964212A (en) * | 2021-03-29 | 2021-06-15 | 广船国际有限公司 | Coating thickness detector and coating thickness detection method |
| CN112964212B (en) * | 2021-03-29 | 2023-09-26 | 广船国际有限公司 | Method for checking coating thickness by using coating thickness detector |
| CN113721233A (en) * | 2021-08-30 | 2021-11-30 | 中国航发沈阳黎明航空发动机有限责任公司 | Three-dimensional optical measurement method for thermal barrier coating thickness of guide blade of multi-connected turbine |
| CN113721233B (en) * | 2021-08-30 | 2023-09-19 | 中国航发沈阳黎明航空发动机有限责任公司 | Three-dimensional optical measurement method for thickness of thermal barrier coating of multi-body turbine guide vane |
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Application publication date: 20180313 |