CN107782235A - A kind of measuring method of carbon fiber storepipe face coat thickness - Google Patents
A kind of measuring method of carbon fiber storepipe face coat thickness Download PDFInfo
- Publication number
- CN107782235A CN107782235A CN201711010922.0A CN201711010922A CN107782235A CN 107782235 A CN107782235 A CN 107782235A CN 201711010922 A CN201711010922 A CN 201711010922A CN 107782235 A CN107782235 A CN 107782235A
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- thickness
- storepipe
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- coating
- control sample
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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
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
- G01B7/06—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness
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- General Physics & Mathematics (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
Measuring method of the present invention for carbon fiber storepipe using eddy current principle calibrator test storepipe surface non-conductive coating：Make the calibration control sample block with case material phase condition of equivalent thickness, one block or a part are pressed into housing applying coating identical technique applying coating, measure the thickness of uncoated coating control sample block and applying coating control sample block respectively using slide calliper rule, the thickness of uncoated coating control sample block is subtracted by the thickness of applying coating control sample block, obtains the thickness L0 of applying coating.The thickness of uncoated coating control sample block is measured using eddy current principle calibrator, obtains L1, the thickness of uncoated coating control sample block is measured using eddy current principle calibrator, obtains L2, calculates calibration factor K=L0/ (L2 L1).For the housing entity measuring of corresponding thickness, measured using eddy current principle calibrator, obtain L3, corrected L3, obtain physical measurement L=K (L3 L1).
Description
Technical field
The present invention relates to the measuring method of rocket engine cast face coat thickness in rocket engine manufacturing process.
Background technology
Rocket engine requires that rocket engine cast surface needs to apply in production process is manufactured according to product design
For example anti-laser coatings of protective coating, thermal protective coating, anti-static coating, finish paint etc. are covered, while it is also proposed wanting for coating layer thickness
Ask.For this reason, it may be necessary in product manufacturing production process, the thickness for coating protective coating is tested.For steel sheel solid
Magnetic principles calibrator can be used to measure for rocket engine, its face coat thickness, and when probe contacts with coat, visit
The magnetic head of head forms a closed magnetic circuit with magnetic metal matrix, due to the presence of non magnetic coat, changes magnetic circuit reluctance,
Cause magnetic flux change.General coat thickness is thicker, and magnetic flux is smaller, and induced electromotive force is smaller., can by measuring its change
Calculate the thickness of coat.But it can not be measured using magnetic principles calibrator for carbon fiber storepipe.At present
It is using measuring method：Under storepipe horizontal state, using before and after storepipe skirt or front and rear machine mouth as support benchmark,
The exterior horizontal location parallel to storepipe central shaft of housing measures frock, it is determined that after specific measurement point, using depth
For the storepipe point to horizontal location measurement frock apart from size, the range difference of the two is to apply before and after chi measurement coating coating
Layer thickness value.Because the skirt before and after storepipe or front and rear opening supports horizontal location measurement frock use threaded connection, for
For large rocket engine housing, its horizontal location measurement frock length is larger, causes the measured value precision of this method can not
Ensure, simply a reference value.
Eddy current principle calibrator is that electromagnetic field is produced in probe coil by high frequency ac signal, is popped one's head in close to conductor
When, can conductor produce vortex, probe distance conductor is nearer, then be vortexed it is bigger, reflection resistance it is also bigger, pass through feed back make
Dosage can symbolize the size of distance between probe and conducting base, i.e. coating layer thickness.Eddy current principle calibrator is applied to more
Nonmagnetic metal surface non-conductive coating, the thickness measuring of plated film, such as measure copper, aluminium, zinc, nonmagnetic metal surface film, enamel,
The non-conducting material thickness such as enamel, anodic film.Because carbon fiber is conducting polymer composite, current vortex can be used from principle
Principle calibrator measures to its surface non-conductive coating layer thickness, but carbon fibre composite and nonmagnetic material are conductive
Performance difference is larger, simultaneously because the rocket engine cast wall unevenness of carbon fiber winding shaping is even, therefore uses current vortex
The thickness measuring that principle calibrator is applied to carbon fiber rocket engine cast non-conductive coating layer is different from plating in nonmagnetic metal surface
Layer, the thickness measuring of plated film, correlation technique report is there are no up to now.
The content of the invention
The present invention is provided using a kind of eddy current principle calibrator test storepipe table for carbon fiber storepipe
The method of testing of face non-conductive coating layer.
The method of testing of the present invention is to make the calibration control sample block with carbon fiber storepipe material phase condition of equivalent thickness, will
One block or a part press carbon fiber storepipe applying coating identical technique applying coating, are measured and are not coated with respectively using slide calliper rule
The thickness of coating control sample block and applying coating control sample block is covered, uncoated painting is subtracted by the thickness of applying coating control sample block
The thickness of layer control sample block, obtains the thickness L0 of applying coating.Uncoated coating contrast is measured using eddy current principle calibrator
The thickness of sample block, measured value L1 is obtained, be worth on the basis of the measured value is defined into L1, is not coated with using eddy current principle calibrator measurement
The thickness of coating control sample block is covered, obtains measured value L2, measured value calibration factor K, K=L0/ (L2-L1) can be calculated.For right
The storepipe entity measuring of thickness is should determine that, is measured using eddy current principle calibrator, measured value L3 is obtained, L3 is entered
Row corrected Calculation, obtain physical measurement L=K (L3-L1).Therefore the measuring method of the present invention includes, and calibrates control sample block system
Make, benchmark value calibration and measurement value calibration, entity measuring.
The difference of the corresponding storepipe axial width of the present invention, the calibration control sample block of corresponding different-thickness is made, for
The entity measuring of the specific thickness of each storepipe, it is intended to carry out benchmark value calibration and measures value calibration；Measuring method is：1)
Control sample block is calibrated to make, according to the difference of end socket, cylinder thickness before and after technological requirement and storepipe, corresponding storepipe axle
The position for needing to measure to determination, its corresponding carbon fiber fire is determined for measurement position determined by storepipe axial direction
The thickness of arrow housing, two pieces of the standard sample of corresponding thickness is made of carbon fiber storepipe material respectively, with kind of calliper its
Thickness, and mark or record；It is one of to press technological requirement applying coating, then with its thickness of kind of calliper, subtract its uncoated
The thickness of coating, obtain coating layer thickness L0, mark or record.2) benchmark value calibration and measurement value calibration, for storepipe not
Before the entity measuring of stack pile, benchmark value calibration and measurement value calibration all should be carried out；The corresponding measurement storepipe thickness of selection
Control sample block is calibrated, first selection is not coated with the calibration control sample block of application layer, first measures, obtains using eddy current principle calibrator
To measured value L1, it is worth on the basis of the measured value is defined into L1, marks or record；The calibration control sample block of reselection coat coating,
Measured using eddy current principle calibrator, obtain measured value L2, calculate measured value calibration factor K, K=L0/ (L2-L1),
Mark or record.3) entity measuring, for the storepipe entity measuring to should determine that thickness, using eddy current principle calibrator
Measure, obtain measured value L3, computational entity measured value L=K (L3-L1), L are the thickness of coating, record；Carry out next
The measurement of coating layer thickness at storepipe thickness.
The difference of the corresponding storepipe axial width of the present invention, the difference of corresponding storepipe axial width, makes and fire
Axially identical, the wide 300mm of arrow housing calibration control sample block, for the entity measuring of the specific thickness of each storepipe,
Carry out benchmark value calibration and measurement value calibration；Measuring method is：1) calibrate control sample block to make, according to technological requirement and rocket
End socket, the difference of cylinder thickness before and after housing, made using carbon fiber storepipe material axially identical, wide with storepipe
300mm calibration control sample block, wherein side are coated the wide coatings of 150mm by technological requirement vertically, and axle is determined by technological requirement
To measurement point position, there is coating with kind of calliper respectively in each measurement point position and do not have the thickness on coating one side, there is coating
The thickness that the thickness on one side subtracts coating one side is coating layer thickness L0, mark or record.2) benchmark value calibration and measured value
Calibration, before the entity measuring of storepipe different-thickness, benchmark value calibration and measurement value calibration all should be carried out；Will by technique
The measurement point asked, it is determined that the position of corresponding control sample block calibration measurement, first selection is not coated with the side of application layer, first using current vortex
Principle calibrator measures, and obtains measured value L1, is worth on the basis of the measured value is defined into L1, marks or records；Reselection applies
The side of application layer, measured using eddy current principle calibrator, obtain measured value L2, calculate measured value calibration factor K, K
=L0/ (L2-L1), mark or record.3) entity measuring, for the storepipe entity measuring to should determine that thickness, using electricity
Vortex principle calibrator measures, and obtains measured value L3, and computational entity measured value L=K (L3-L1), L are the thickness of coating
Degree, record；Carry out the measurement of coating layer thickness at next storepipe thickness.
During the eddy current principle calibrator MiniTest7400 calibrators that the present invention uses, 1 calibration control sample block preparing department
Divide content unchanged；In benchmark value calibration and measured value calibrated section, using the zero offset capability of the instrument, will be surveyed
L1 a reference value amendments are arranged to 0, surveyed L2 amendments are arranged into L0, other guide is unchanged；In entity measuring, because the instrument
Device data are corrected automatically, and it is physical measurement L to survey L3 values, and the thickness of coating, other guide are unchanged.
Embodiment
The present invention measures according to foregoing measuring method to product testing part and product, and concrete outcome is as follows：
Specific implementation 1. tests certain testpieces using eddy current principle MiniTest7400 calibrators.It is different thick for three kinds
Testpieces A, B, C of degree are measured, and L1 a reference values are not arranged into 0 in measurement process, surveyed L2 is not arranged into L0's yet
Method is tested, and specific data are as follows：
Specific implementation 2. tests certain testpieces using eddy current principle MiniTest7400 calibrators.It is different thick for three kinds
Testpieces A, B, C of degree are measured, and L1 a reference value amendments are arranged into 0 in measurement process, while surveyed L2 amendments are arranged into L0
Method test, specific data are as follows：
Specific implementation 3. tests certain product using eddy current principle MiniTest7400 calibrators, corresponding control sample block be with
Axially identical, the wide 300mm of storepipe calibration control sample block, according to technological requirement, several measurement points are selected to measure；Survey
L1 a reference values are arranged to 0 during amount, while surveyed L2 is arranged to L0 method test, 10 measurement points tools are provided herein
Volume data：
The present invention realizes non-using eddy current principle calibrator test storepipe surface for carbon fiber storepipe
The method of testing of conductive coating.
Claims (4)
1. a kind of measuring method of carbon fiber storepipe face coat thickness, it is characterised in that for carbon fiber storepipe
Surface nonmagnetic coating uses eddy current principle calibrator measurement surface coating layer thickness, and measuring method includes, and calibrates control sample block
Make, benchmark value calibration and measurement value calibration, entity measuring.
A kind of 2. measuring method of carbon fiber storepipe face coat thickness according to claim 1, it is characterised in that
The difference of corresponding storepipe axial width, the calibration control sample block of corresponding different-thickness is made, for each storepipe
The entity measuring of specific thickness, it is intended to carry out benchmark value calibration and measures value calibration；Measuring method is,
1) control sample block is calibrated to make, according to the difference of end socket, cylinder thickness before and after technological requirement and storepipe, corresponding rocket
Housing axially determines the position that needs measure, and its corresponding carbon is determined for measurement position determined by storepipe axial direction
The thickness of fiber storepipe, two pieces of the standard sample of corresponding thickness is made of carbon fiber storepipe material respectively, uses slide calliper rule
Its thickness is measured, and marks or records；It is one of to press technological requirement applying coating, then with its thickness of kind of calliper, subtract it
The thickness of application layer is not coated with, obtains coating layer thickness L0, mark or record；
2) benchmark value calibration and measurement value calibration, before the entity measuring of storepipe different-thickness, all should carry out a reference value
Calibration and measurement value calibration；The calibration control sample block of the corresponding measurement storepipe thickness of selection, first selection are not coated with the school of application layer
Quasi- control sample block, is first measured using eddy current principle calibrator, obtains measured value L1, on the basis of the measured value defined into L1
Value, mark or record；The calibration control sample block of reselection coat coating, is measured using eddy current principle calibrator, obtained
Measured value L2, calculate measured value calibration factor K, K=L0/ (L2-L1), mark or record；
3) entity measuring, for the storepipe entity measuring to should determine that thickness, surveyed using eddy current principle calibrator
Amount, obtains measured value L3, and computational entity measured value L=K (L3-L1), L are the thickness of coating, record；Carry out next rocket shell
The measurement of coating layer thickness at body thickness.
A kind of 3. measuring method of carbon fiber storepipe face coat thickness according to claim 1, it is characterised in that
The difference of corresponding storepipe axial width, makes the calibration control sample block with axially identical, the wide 300mm of storepipe, for
The entity measuring of the specific thickness of each storepipe, it is intended to carry out benchmark value calibration and measures value calibration, measuring method is：
1) control sample block is calibrated to make, it is fine using carbon according to the difference of end socket, cylinder thickness before and after technological requirement and storepipe
The making of storepipe material and axially identical, the wide 300mm of storepipe calibration control sample block are tieed up, technological requirement is pressed in wherein side
The wide coatings of 150mm are coated vertically, determine axially measured position by technological requirement, slide calliper rule are used respectively in each measurement point position
Measurement has coating and does not have the thickness on coating one side, and the thickness that the thickness for having coating one side subtracts coating one side is painting thickness
Spend L0, mark or record；
2) benchmark value calibration and measurement value calibration, before the entity measuring of storepipe different-thickness, all should carry out a reference value
Calibration and measurement value calibration；By the measurement point of technological requirement, it is determined that the position of corresponding control sample block calibration measurement, first selection is not coated with
The side of application layer, first measured using eddy current principle calibrator, obtain measured value L1, it is base that the measured value is defined into L1
Quasi- value, mark or record；The side of reselection coat coating, measured using eddy current principle calibrator, obtain measured value
L2, calculate measured value calibration factor K, K=L0/ (L2-L1), mark or record；
3) entity measuring, for the storepipe entity measuring to should determine that thickness, surveyed using eddy current principle calibrator
Amount, obtains measured value L3, and computational entity measured value L=K (L3-L1), L are the thickness of coating, record；Carry out next rocket shell
The measurement of coating layer thickness at body thickness.
4. the measuring method of any carbon fiber storepipe face coat thickness according to Claims 2 or 3, its feature
It is, used eddy current principle calibrator MiniTest7400 calibrators, is carrying out benchmark value calibration and measurement value calibration
When, using the zero offset capability of instrument, surveyed L1 a reference values amendment is arranged to 0, surveyed L2 amendments are arranged to L0；Entering
It is physical measurement L that L3 values are surveyed during row entity measuring, and the thickness of coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711010922.0A CN107782235A (en) | 2017-10-26 | 2017-10-26 | A kind of measuring method of carbon fiber storepipe face coat thickness |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711010922.0A CN107782235A (en) | 2017-10-26 | 2017-10-26 | A kind of measuring method of carbon fiber storepipe face coat thickness |
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| CN107782235A true CN107782235A (en) | 2018-03-09 |
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| CN201711010922.0A Pending CN107782235A (en) | 2017-10-26 | 2017-10-26 | A kind of measuring method of carbon fiber storepipe face coat thickness |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110553616A (en) * | 2019-10-08 | 2019-12-10 | 江西洪都航空工业集团有限责任公司 | Method for measuring thickness of special-shaped surface coating |
| CN111089877A (en) * | 2019-12-31 | 2020-05-01 | 苏州先机动力科技有限公司 | Nondestructive testing method and equipment for thermal barrier coating |
| CN114322795A (en) * | 2021-12-28 | 2022-04-12 | 凯多智能科技(上海)有限公司 | Automatic correcting electric eddy current laser combined thickness gauge |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110553616A (en) * | 2019-10-08 | 2019-12-10 | 江西洪都航空工业集团有限责任公司 | Method for measuring thickness of special-shaped surface coating |
| CN111089877A (en) * | 2019-12-31 | 2020-05-01 | 苏州先机动力科技有限公司 | Nondestructive testing method and equipment for thermal barrier coating |
| CN114322795A (en) * | 2021-12-28 | 2022-04-12 | 凯多智能科技(上海)有限公司 | Automatic correcting electric eddy current laser combined thickness gauge |
| CN114322795B (en) * | 2021-12-28 | 2023-12-29 | 凯多智能科技(上海)有限公司 | Automatic correction electric vortex laser combined thickness gauge |
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