CN114167008A - Method for rapidly measuring lamination coefficient of iron-based amorphous strip - Google Patents
Method for rapidly measuring lamination coefficient of iron-based amorphous strip Download PDFInfo
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 88
- 238000003475 lamination Methods 0.000 title claims abstract description 51
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 37
- 239000002356 single layer Substances 0.000 claims abstract description 109
- 238000006073 displacement reaction Methods 0.000 claims abstract description 16
- 238000005259 measurement Methods 0.000 claims abstract description 16
- 239000000523 sample Substances 0.000 claims description 98
- 238000001816 cooling Methods 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 7
- 238000005520 cutting process Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 229910000808 amorphous metal alloy Inorganic materials 0.000 description 5
- 238000000691 measurement method Methods 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000005300 metallic glass Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
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Abstract
The invention provides a method for rapidly measuring lamination coefficient of an iron-based amorphous strip, which comprises the following steps: preparing a single-layer sample group; randomly extracting a single monolayer sample from the monolayer sample group; scanning by using a fixed double-head correlation laser coaxial displacement meter to obtain the average thickness value of the single-layer sample; scanning and measuring by using a CCD dimension vision system to obtain a width value and a length value of the single-layer sample; measuring the weight value of the single-layer sample by using a precision electronic balance; calculating the lamination coefficient of the iron-based amorphous strip according to the obtained thickness average value, width value, length value and weight value of the single-layer sample; the measuring method has high accuracy and high speed, improves the lamination coefficient measuring speed of the existing amorphous strip, and reduces the influence of errors on the measuring result, thereby improving the precision of the lamination coefficient measurement.
Description
Technical Field
The invention relates to the technical field of magnetic materials, in particular to a method for quickly measuring lamination coefficients of an iron-based amorphous strip.
Background
Iron-based amorphous alloy or metallic glass is a novel technology which is produced in the 70 s of the 20 th century, and molten steel is formed into a thin strip with the thickness of about 25-30 microns at one time by utilizing a quenching technology. Atoms of the iron-based amorphous strip are in an amorphous structure in random arrangement, so that the iron-based amorphous strip has a narrow B-H loop and has the characteristics of high magnetic permeability and low loss; meanwhile, the irregularity of the atomic arrangement of the amorphous alloy limits the free passage of electrons, so that the resistivity is 2-3 times higher than that of the crystalline alloy, thereby being beneficial to reducing the eddy current loss, and the iron-based amorphous strip has the characteristics of high saturation magnetic induction intensity, high magnetic conductivity, low loss, low coercive force and the like, is greatly valued and deeply researched, and is widely applied to high-power switching power supplies, inverter power supplies, magnetic amplifiers, high-frequency transformers, high-frequency converters, high-frequency choke coil iron cores, current transformer iron cores, leakage protection switches and common-mode inductance iron cores.
The lamination coefficient is the effective area coefficient of the transformer lamination core, the higher the lamination coefficient is, the larger the effective area of the core is, the magnetic flux density is reduced, the loss is reduced, and factors influencing the lamination coefficient of the iron-based amorphous alloy strip include strip surface quality, strip thickness deviation, an iron core lamination process and the like, so that the lamination coefficient of the amorphous alloy strip needs to be measured.
In the prior art, a plane pressure method and a ring winding method are generally adopted to measure the lamination coefficient, wherein the plane pressure method is suitable for measuring the lamination coefficient of strip materials such as rectangular iron cores, binding blocks and the like; the measurement principle of the plane pressure method is that a section of strip is cut into a certain number of sheet samples with certain size, the sheet samples are orderly stacked in the same direction to form a sample lamination, the maximum thickness of the sample lamination in the direction vertical to the strip casting direction is measured under the specified pressure, and the lamination coefficient is calculated according to the parameters of the sample lamination, such as quality, length, width, maximum thickness, material density and the like; the ring rolling method is suitable for measuring the lamination coefficient of a strip for an annular iron core, and the measurement principle is that a certain strip sample is wound into a ring at a certain tension, and the lamination coefficient is calculated by measuring the size and the mass of the ring. However, the plane pressure method needs to adopt a pressurizing device to pressurize for multiple times to measure the maximum thickness, the measuring time is long, manual measurement is needed when the length and the width of the sample lamination are measured, and errors are easy to generate; the coil ring method is small in application range, is only suitable for annular iron cores, and cannot meet the measurement requirements of most transformer laminated iron cores in the market.
Disclosure of Invention
Aiming at the defects of the prior art that the plane pressure method and the ring rolling method are adopted for measurement, the invention provides a method for rapidly measuring the lamination coefficient of an iron-based amorphous strip, which solves the problems of long measurement time, large error, low accuracy, small application range of the ring rolling method and the like of the plane pressure method, has high measurement accuracy and high speed, improves the measurement speed of the lamination coefficient of the conventional amorphous strip, and is realized by the following technical scheme for realizing the purposes:
a method for rapidly measuring lamination coefficient of an iron-based amorphous strip comprises the following steps:
s1, preparing a single-layer sample group;
s2, randomly extracting a single monolayer sample from the monolayer sample group;
s3, scanning by using a fixed double-head correlation laser coaxial displacement meter to obtain the thickness average value of the single-layer sample; scanning and measuring by using a CCD dimension vision system to obtain a width value and a length value of the single-layer sample; measuring the weight value of the single-layer sample by using a precision electronic balance;
and S4, calculating the lamination coefficient of the iron-based amorphous strip according to the thickness average value, the width value, the length value and the weight value of the single-layer sample obtained in the step S3.
Preferably, the specific implementation manner of step S1 is: selecting a section of continuous iron-based amorphous strip with the width of 142mm and the length of one or two cooling roller circumferences, and cutting the continuous iron-based amorphous strip into 10-20 single-layer samples with the same length to form a single-layer sample group.
Preferably, the circumference of the cooling roller is 3.14 meters, and the diameter of the cooling roller is 1 meter.
Preferably, the monolayer sample has a length of 300 + -1 mm and a width of 142 + -0.2 mm.
Preferably, the specific implementation manner of step S3 is:
placing the single-layer sample on a servo platform, in the process that the single-layer sample moves upwards along with the servo platform, simultaneously, directly scanning the single-layer sample by using a fixed double-head correlation laser coaxial displacement meter, scanning the thickness of the single-layer sample at a scanning rate of 0-20m/min along 3 different positions in the width direction of the single-layer sample during scanning, determining the total point number of each position according to a single-layer sample thickness total point number formula, summarizing all thickness values of the single-layer sample obtained through measurement to obtain an average value, and finally obtaining the thickness average value of the single-layer sample;
directly scanning and measuring the width value and the length value of the single-layer sample by using a CCD size vision system, wherein the obtained width value and length value are the width value and length value of the single-layer sample measured at this time;
and directly placing the single-layer sample on an electronic balance for measurement to obtain the weight value of the single-layer sample.
Preferably, the total point number formula of the thickness of the single-layer sample is as follows:
x = W X Y/Z formula 1;
wherein X is the total number of points; w is the width value of the single-layer sample, and the unit of W is mm; z is the moving speed of the servo platform, the unit of Z is mm/s, Y is the laser acquisition period used on the double-head correlation laser coaxial displacement meter, and the unit of Y is mus.
Preferably, the spot diameter of the laser probe used on the double-head correlation laser coaxial displacement meter is 500 μm, the resolution is 0.1 μm, the coaxiality is 0.2 μm, and the scanning speed is 1.2 m/min.
Preferably, the precision electronic balance has a precision unit of 0.0001 g.
Preferably, the moving precision of the servo platform is not more than 0.02mm, and the scanning pixel of the CCD dimension vision system is not less than 2000 ten thousand.
Preferably, the specific calculation manner of step S4 is: substituting the obtained thickness average value, width value, length value and weight value of the single-layer sample into a formula 2 to obtain the lamination coefficient of the iron-based amorphous strip;
Lf (= m/(lb) × h) ×) formula 2;
wherein L isfIs the lamination factor; m is the weight value of the single-layer sample, and the unit of m is gram; l is the length value of the single-layer sample, and the unit of l is millimeter; b is the width of the single-layer sampleThe value, b, is in millimeters; h is the average thickness of the monolayer specimen, h is in microns, ρ is the material density of the monolayer specimen, and ρ is in grams per cubic centimeter.
The invention has the beneficial effects that:
according to the invention, the error of the selection of the iron-based amorphous strip is eliminated by a preparation method of cutting the sample by the selection equipment, the average value of the thickness of the single-layer sample is measured by adopting a double-head correlation laser coaxial displacement meter scanning method, the testing method is high in speed and high in accuracy, the width value and the length value of the single-layer sample are measured by utilizing a CCD size vision system in cooperation with servo moving scanning, the error is eliminated, the influence of the error on the measurement result is reduced, and the lamination coefficient measuring speed of the existing amorphous strip is improved.
Drawings
FIG. 1 is a schematic flow chart of the measurement method of the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings and the detailed description below:
in order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention is further described below with reference to the accompanying drawings and examples.
As shown in fig. 1, a method for rapidly measuring lamination factor of an iron-based amorphous strip includes the following steps:
s1, preparing a single-layer sample group;
the specific embodiment for preparing the monolayer sample population is as follows: selecting a section of continuous iron-based amorphous strip with the width of 142mm and the length of one or two cooling roll circumferences, and cutting the continuous iron-based amorphous strip into 10-20 single-layer samples with the same length to form a single-layer sample group; the circumference of the cooling roller is preferably 3.14 meters, the diameter of the cooling roller is 1 meter, the circumference of the cooling roller can also be selected to be 6.28 meters, and the diameter of the cooling roller is 2 meters, which is determined according to an actual object to be measured; the length tolerance of the cut single-layer sample is controlled to be +/-1 mm, and the width tolerance is controlled to be +/-0.2 mm.
S2, a single monolayer specimen is arbitrarily extracted from the monolayer specimen group prepared in the above step S1, and the extracted monolayer specimen is a sample, and the process proceeds to step S3.
S3, scanning by using a fixed double-head correlation laser coaxial displacement meter to obtain the thickness average value of the single-layer sample; scanning and measuring by using a CCD dimension vision system to obtain a width value and a length value of the single-layer sample; measuring the weight value of the single-layer sample by using a precision electronic balance;
the specific implementation modes for obtaining the thickness average value, the length value, the width value and the weight value are respectively as follows:
placing a single-layer sample on a servo platform, and in the process that the single-layer sample moves upwards along with the servo platform, simultaneously, directly scanning the single-layer sample by using a fixed double-head correlation laser coaxial displacement meter, namely, the servo platform moves, and the double-head correlation laser coaxial displacement meter is fixed, so that the laser is fixed, the single-layer sample is only scanned under the movement of the servo platform, the thickness of the single-layer sample is scanned at the scanning speed of 0-20m/min along 3 different positions in the width direction of the single-layer sample during scanning, the light spot diameter of a laser probe used on the adopted double-head correlation laser coaxial displacement meter is 500 micrometers, the resolution is 0.1 micrometers, the coaxiality is 0.2 micrometers, and the scanning speed is controlled at 1.2 m/min; the total point number scanned at each position is determined according to a single-layer sample thickness total point number formula, all measured thickness values of the single-layer sample are collected to obtain an average value, and finally the thickness average value of the single-layer sample is obtained;
the total point number formula of the thickness of the single-layer sample is as follows:
x = W X Y/Z formula 1;
wherein X is the total number of points; w is the width value of the single-layer sample, and the unit of W is mm; z is the moving speed of the servo platform, the unit of Z is mm/s, Y is the laser acquisition period used on the double-head correlation laser coaxial displacement meter, and the unit of Y is mus.
Directly scanning and measuring the width value and the length value of the single-layer sample by using a CCD dimension vision system, wherein the CCD dimension vision system and a servo platform are in a static state, and the obtained width value and length value are the width value and length value of the single-layer sample measured at this time; the moving precision requirement of the servo platform is not more than 0.02mm, and the scanning pixel of the CCD dimension vision system is not less than 2000 ten thousand.
The single-layer sample is directly placed on the precision electronic balance to be measured, the weight value of the single-layer sample is obtained, the precision unit of the selected precision electronic balance is 0.0001g, therefore, more accurate measurement is achieved, and errors caused by other factors are reduced as much as possible.
S4, calculating the lamination coefficient of the iron-based amorphous strip according to the thickness average value, the width value, the length value and the weight value of the single-layer sample obtained in the step S3;
the specific calculation method is as follows: substituting the obtained thickness average value, width value, length value and weight value of the single-layer sample into a formula 2 to obtain the lamination coefficient of the iron-based amorphous strip;
Lf formula 2 of = m/(l × b × h × ρ)
Wherein L isfIs the lamination factor; m is the weight value of the single-layer sample, and the unit of m is gram; l is the length value of the single-layer sample, and the unit of l is millimeter; b is the width value of the single-layer sample, and the unit of b is millimeter; h is the average thickness of the monolayer specimen, h is in microns, ρ is the material density of the monolayer specimen, and ρ is in grams per cubic centimeter.
Example 1:
measuring the lamination coefficient of a laminated core in a certain transformer by using the measuring method, firstly selecting a section of continuous iron-based amorphous strip with the width of 142mm and the length of 3140mm from the laminated core in the transformer, and cutting the continuous iron-based amorphous strip into 15 single-layer samples with the same length to form a single-layer sample group; the length and the width of the prepared single-layer sample have tolerance ranges and are divided evenly; randomly selecting one cut iron-based amorphous strip from 15 pieces as a sample, and scanning by using a double-head correlation laser coaxial displacement meter to obtain the average thickness value of a single-layer sample of 25.80 mu m; measuring by using a CCD dimension vision system in cooperation with servo mobile scanning to obtain a single-layer sample with the width value of 142.24mm and the length value of 299.80 mm; measuring the weight value of the single-layer sample to be 7.0459g by using a precision electronic balance; the material density is 7.20g/cm3(ii) a Calculating to obtain the iron-based amorphous alloy according to the obtained thickness average value, width value, length value and weight valueLamination factor L of stripfThe content was 89.46%.
The lamination coefficient of the laminated core of the transformer is detected by adopting national standard GB/T19346.2-2017, and the finally obtained thickness average value is 25.7um, the width value is 142.24mm, the length value is 3140mm, the weight value is 74.1g, and the material density is 7.20g/cm3(ii) a Lamination coefficient L of obtained iron-based amorphous stripfThe content was 89.66%.
Therefore, the error of the measuring method is small, the final result is the same as the national standard, and the obtained result is basically consistent.
Example 2:
if the error is further reduced and the accuracy is improved in an actual measurement scene, the measurement method of embodiment 1 can be performed twice or even multiple times, that is, two or more lamination coefficients are obtained, and then an average value of the lamination coefficients is obtained by averaging the obtained lamination coefficients, so that the accuracy of the measurement method is further improved.
Various other modifications and changes may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes should fall within the scope of the claims of the present invention.
Claims (10)
1. A method for rapidly measuring lamination coefficient of an iron-based amorphous strip is characterized by comprising the following steps:
s1, preparing a single-layer sample group;
s2, randomly extracting a single monolayer sample from the monolayer sample group;
s3, scanning by using a fixed double-head correlation laser coaxial displacement meter to obtain the thickness average value of the single-layer sample; scanning and measuring by using a CCD dimension vision system to obtain a width value and a length value of the single-layer sample; measuring the weight value of the single-layer sample by using a precision electronic balance;
and S4, calculating the lamination coefficient of the iron-based amorphous strip according to the thickness average value, the width value, the length value and the weight value of the single-layer sample obtained in the step S3.
2. The method for rapidly measuring the lamination factor of the iron-based amorphous strip according to claim 1, wherein the step S1 is implemented in a specific manner: selecting a section of continuous iron-based amorphous strip with the width of 142mm and the length of one or two cooling roller circumferences, and cutting the continuous iron-based amorphous strip into 10-20 single-layer samples with the same length to form a single-layer sample group.
3. The method for rapidly measuring the lamination factor of the iron-based amorphous strip as claimed in claim 2, wherein the circumference of the cooling roll is 3.14 m, and the diameter of the cooling roll is 1 m.
4. The method for rapidly measuring the lamination factor of the iron-based amorphous strip as claimed in claim 1, wherein the length of the single-layer sample is 300 ± 1mm, and the width of the single-layer sample is 142 ± 0.2 mm.
5. The method for rapidly measuring the lamination factor of the iron-based amorphous strip according to claim 1, wherein the step S3 is implemented in a specific manner:
placing the single-layer sample on a servo platform, in the process that the single-layer sample moves upwards along with the servo platform, simultaneously, directly scanning the single-layer sample by using a fixed double-head correlation laser coaxial displacement meter, scanning the thickness of the single-layer sample at a scanning rate of 0-20m/min along 3 different positions in the width direction of the single-layer sample during scanning, determining the total point number of each position according to a single-layer sample thickness total point number formula, summarizing all thickness values of the single-layer sample obtained through measurement to obtain an average value, and finally obtaining the thickness average value of the single-layer sample;
directly scanning and measuring the width value and the length value of the single-layer sample by using a CCD size vision system, wherein the obtained width value and length value are the width value and length value of the single-layer sample measured at this time;
and directly placing the single-layer sample on an electronic balance for measurement to obtain the weight value of the single-layer sample.
6. The method for rapidly measuring the lamination coefficient of the iron-based amorphous strip as claimed in claim 5, wherein the total point number formula of the thickness of the single-layer sample is as follows:
x = W X Y/Z formula 1;
wherein X is the total number of points; w is the width value of the single-layer sample, and the unit of W is mm; z is the moving speed of the servo platform, the unit of Z is mm/s, Y is the laser acquisition period used on the double-head correlation laser coaxial displacement meter, and the unit of Y is mus.
7. The method for rapidly measuring the lamination factor of the iron-based amorphous strip as claimed in claim 5, wherein the spot diameter of a laser probe used on the double-head correlation laser coaxial displacement meter is 500 μm, the resolution is 0.1 μm, the coaxiality is 0.2 μm, and the scanning speed is 1.2 m/min.
8. The method for rapidly measuring the lamination factor of the iron-based amorphous strip according to claim 5, wherein the precision electronic balance has a precision unit of 0.0001 g.
9. The method of claim 5, wherein the servo stage is moved with a precision not greater than 0.02mm, and the CCD dimension vision system has a scanning pixel not less than 2000 ten thousand.
10. The method for rapidly measuring the lamination factor of the iron-based amorphous strip according to claim 1, wherein the step S4 is specifically calculated by: substituting the obtained thickness average value, width value, length value and weight value of the single-layer sample into a formula 2 to obtain the lamination coefficient of the iron-based amorphous strip;
Lf (= m/(lb) × h) ×) formula 2;
wherein L isfIs the lamination factor; m is the weight value of the single-layer sample, and the unit of m is gram; l is the length of the monolayer specimen, and l is expressed in milliRice; b is the width value of the single-layer sample, and the unit of b is millimeter; h is the average thickness of the monolayer specimen, h is in microns, ρ is the material density of the monolayer specimen, and ρ is in grams per cubic centimeter.
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