CN103499272A - Wide-range magnetic thickness measuring device for non-magnetic coating of ferromagnetic component and detection method of wide-range magnetic thickness measuring device - Google Patents
Wide-range magnetic thickness measuring device for non-magnetic coating of ferromagnetic component and detection method of wide-range magnetic thickness measuring device Download PDFInfo
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- CN103499272A CN103499272A CN201310470185.8A CN201310470185A CN103499272A CN 103499272 A CN103499272 A CN 103499272A CN 201310470185 A CN201310470185 A CN 201310470185A CN 103499272 A CN103499272 A CN 103499272A
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Abstract
The invention discloses a wide-range magnetic thickness measuring device for a non-magnetic coating of a ferromagnetic component and a detection method of the wide-range magnetic thickness measuring device. The wide-range magnetic thickness measuring device is suitable for nondestructive measurement of large thickness of the non-magnetic coating of the ferromagnetic component. The wide-range magnetic thickness measuring device comprises a base plate, a magneto-dependent sensor, rectangular permanent magnets, a bar yoke, a probe connecting line and a processing circuit. The detection method comprises the following detection steps: 1, manufacturing a probe; 2, performing calibration by utilizing the manufactured probe, covering the surface of a material with a non-ferromagnetic material with known thickness, wherein the material is the same as an internal ferromagnetic material of a to-be-measured component; laying the probe flatwise to measure the size of a magnetic field, then, increasing certain coating thickness and recording the size of the magnetic field, and making a trend line that the magnetic field is changed along with the thickness by utilizing two sets of measured magnetic field values and corresponding thickness values; 3, performing actual measurement, laying the probe flatwise on the surface of the to-be-measured coating, recording the size of the magnetic field, contrasting the trend line, and calculating the thickness of the coating. The wide-range magnetic thickness measuring device disclosed by the invention has the advantages that the structure is simple, the measuring range is wide, the accuracy is high and the stability is high.
Description
Technical field
The present invention relates to wide range Magnetic gaugemeter device and the detection method thereof of the non magnetic coating of a kind of ferromagnetic component.
Background technology
Measuring of coating thickness is an important ring of secondary industry, Surface Engineering quality testing, is also the indispensable means of weighing product quality grade.The measuring method of coating thickness, have loss measurement and nondestructive measurement from whether tested coating being destroyed, being divided into.Diminish the measuring method means loaded down with trivial details, speed is slow, and the measurement meeting damages article, multiplex in sampling Detection.Nondestructive measurement is divided into magnetic method, eddy-current method, rays method (comprising β ray reflectometry, X-ray diffraction method, fluorescent X-ray method etc.), optical method (comprising light cross-section method, photoelectric method, double beam interferometry etc.), capacitance method, microwave method, thermoelectric method and quartz oscillation method etc.Existing nondestructive thickness measuring method exists following shortcoming in actual applications: (1) detect thickness is thinner, the coating thickcness measurement scope be difficult to reach 40mm or more than; (2) pop one's head in normally single-point contact magnetic induction probe of the magnetic induction that existing coating thickness measuring adopts, contact unstablely with measurement face during this single-point type magnetic induction probe measurement, affect measurement result; (3) the measuring equipment volume is large, complicated operation, and the measurement cost is high and actual efficiency is low.
In sum, in measuring commercial production, many ferromagnetism product surfaces cover, be similar to the nonferromagnetic coating thicknesses such as rubber when larger, after use has loss measurement, product can't continue to use, and measure cost too high, use existing nondestructive thickness measuring method, make that efficiency is low, cost is large, and be difficult to reach the requirement that the large thickness range of product in using measured.
Summary of the invention
The object of the present invention is to provide wide range Magnetic gaugemeter device and the detection method thereof of the non magnetic coating of a kind of ferromagnetic component, it has, and method is simple and convenient, the measurement range is large, the advantage of degree of accuracy height and good stability.
The present invention is achieved like this, the wide range Magnetic gaugemeter device of the non magnetic coating of a kind of ferromagnetic component, it comprises backing plate, magneto-dependent sensor, the first permanent magnet, the second permanent magnet, the bar shaped yoke, the probe connecting line, treatment circuit, signal acquisition module, computer acquisition measurement mechanism and probing shell, it is characterized in that, the upper end of the upper end of the first permanent magnet and the second permanent magnet is connected to bar shaped yoke two ends, the lower end of the lower end of the first permanent magnet and the second permanent magnet is fixedly connected on backing plate, magneto-dependent sensor is between the first permanent magnet and the second permanent magnet, and be fixed on backing plate, the probe data line is connected between magneto-dependent sensor and treatment circuit, be connected with signal acquisition module between treatment circuit and computer acquisition measurement mechanism, magneto-dependent sensor, the first permanent magnet, the second permanent magnet and bar shaped yoke all are positioned at the space of probing shell and backing plate formation, described backing plate is the nonferromagnetic hard material.
Described the first permanent magnet, the second permanent magnet and bar shaped yoke connect and compose U-shaped yoke.
Described the first permanent magnet is relative with the second permanent magnet heteropole, the middle parallel magnetic field that forms.
The sensitive area normal parallel of described magneto-dependent sensor is in the ferromagnetic component surface, and perpendicular to U-shaped yoke bipod line.
Described treatment circuit comprises signal first order amplification module, signal second level amplification module and filtration module.
Described detection method comprises the steps: (1) step making probe, identical two rectangle permanent magnet different poles are adsorbed on relatively respectively to bar shaped yoke two ends and form U-shaped yoke, magneto-dependent sensor is positioned in the middle of permanent magnet, and connects treatment circuit by the probe connecting line; The probe that (2) step utilization is made is demarcated, use the material identical with tested component inside ferrimagnet, nonferromugnetic material in its surface coverage known thickness, probe keeps flat and records the magnetic field size, rear increase coating thickness recording magnetic field size, utilize two groups of magnetic field values that record and corresponding one-tenth-value thickness 1/10 to make the Trendline of magnetic field with variation in thickness; (3) step actual measurement, probe lies against tested clad surface, and the recording magnetic field size, contrast the position of this value in step 2 Trendline, calculates coating thickness; Described U-shaped yoke steadily is positioned over clad surface in use.
Technique effect of the present invention is: the inventive method is simple, sonde configuration is easy, without extrinsic motivated, measure the large and good economy performance of range, and there is good stability and repeatability.
The accompanying drawing explanation
Fig. 1 is the non magnetic coating thickcness measurement Method And Principle of ferromagnetic component of the present invention schematic diagram;
Fig. 2 is the open Distribution of Magnetic Field figure that the U-shaped yoke of the present invention produces;
Fig. 3 is the structural representation of Thicknesser probe of the present invention and device;
Fig. 4 is the 3-D display schematic diagram of Thicknesser probe of the present invention;
Fig. 5 is the functional-block diagram that apparatus of the present invention signal is processed;
Fig. 6 is that the present invention measures interior spheroid rubber coatings thickness example sonde configuration figure;
Embodiment
Below by by embodiment, the present invention being described in further detail;
As shown in Figure 1, U-shaped yoke lies against tested ferromagnetic component 6 surfaces to the non magnetic coating thickcness measurement principle of ferromagnetic component of the present invention, between the first permanent magnet 3, the second permanent magnet 4 and the tested member 6 at bar shaped yoke 5 the two poles of the earth, forms magnetic loop.When the non magnetic coating of tested member 6 is thinner, because of tested member 6 and U-shaped yoke to lift from distance less, magnetic loop leaks also less in the magnetic field in space.With tested member 6 and the distance of lifting from of yoke, increase gradually, the space magnetic field of magneto-dependent sensor 2 regions increases gradually, and the variation that the variation of this regional magnetic field is lifted from distance with member 6 and yoke changes, and therefore by sensor 2, picks up its magnetic field levels component B
xvariation, by the signal condition analysis, can measure the thickness of coating.Finer magnetic loop as shown in Figure 2.Fig. 2 a is depicted as the magnetic circuit magnetic line of force of coating when thinner and distributes, and Fig. 2 b is depicted as the magnetic circuit magnetic line of force of coating when thicker and distributes.Set up measurement model, utilize the vertical level amount B that measures magnetic field that places of magneto sensor 2
x, the magnetic field levels component B of magneto sensor 2 outputs under different coating thicknesses
xrelation with coating thickness.
As shown in Fig. 3～6, the non magnetic coating thickcness measurement method of ferromagnetic component of the present invention, comprise the steps:
The 1st step is made probe, as shown in Figure 3, identical two rectangles the first permanent magnet 3 respectively be adsorbed on bar shaped yoke 5 two ends relative to the second permanent magnet 4 different poles are formed to U-shaped yoke, magneto-dependent sensor 2 is positioned over to the first permanent magnet 3 and the second permanent magnet 4 centres, and U-shaped yoke and magneto-dependent sensor 2 are placed on backing plate 1 jointly, surrounded and be encapsulated by probing shell 11.Magneto-dependent sensor 2 is placed in tested member 6 surfaces by its sensitive area normal parallel, and perpendicular to U-shaped yoke bipod line.Magneto-dependent sensor 2 is received treatment circuit 8 by probe connecting line 7, and is connected to signal acquisition module 9 and computer acquisition measurement mechanism 10; Fig. 4 is the 3-D display schematic diagram of probe;
The probe that the 2nd step utilization is made is demarcated, use the material identical with tested member 6 materials, at the nonferromagnetic material of its surface coverage known thickness, increase certain coating thickness recording magnetic field size, when coating thickness increases gradually, the horizontal magnetic field horizontal component B of magneto-dependent sensor 2
xbecome near-linear to increase.The magnetic field levels component B that utilizes two groups of known coating thicknesses and magneto-dependent sensor 2 to measure
xsize, obtain coating thickness and B
xbetween linear relationship, make the Trendline that magnetic field changes with coating thickness;
The 3rd step actual measurement, probe lies against tested clad surface, and the recording magnetic field size, contrast the position of this value in step 2 Trendline, calculates coating thickness.
The inventive method detection signal principle as shown in Figure 5, mainly comprises detection probe, signal first order amplification module, signal second level amplification module, filtration module, signal acquisition module and computer acquisition measurement module.The specific works process is: detection probe is picked up the magnetic field levels component B that contains non magnetic coating information
xweak output signal need to be nursed one's health it, therefore after processing by signal first order amplification module, signal second level amplification module, filtration module, the entering signal acquisition module, in the computer acquisition measurement module, the Trendline of integrating step 2 is calculated and is obtained coating thickness.
As shown in Figure 6, be the product interior spheroid rubber coatings thickness measure example that certain company produces, sphere diameter is 750mm, and inside is steel ball 12, and rubber coatings 13 thickness are about 40-50mm, and concrete implementation step is as follows:
N, S that the 1st step is respectively rectangle the first permanent magnet 3 of 4.9 * 4.9 * 2.7mm and the second permanent magnet 4 by the wide height of identical two block length are extremely relative, be adsorbed on respectively high bar shaped yoke 5 two ends that are respectively 18.6 * 4.9 * 2mm of length and width and form U-shaped yoke, the permanent magnet end of U-shaped yoke is fixed on the backing plate 1 of making of the thick epoxy plate of 3mm, and use plastics probing shell 11 will be popped one's head in to surround and is encapsulated.The flat strip magneto-dependent sensor 2 that is 12.5 * 8mm by length and width is positioned in the middle of the first permanent magnet 3 and the second permanent magnet 4, and magneto-dependent sensor 2 is placed in tested member 6 surfaces by its sensitive area normal parallel, and perpendicular to U-shaped yoke bipod line.And press Fig. 3 connecting circuit and computing machine;
The 2nd step is used the ball material of the same race that sphere diameter is 750mm, the thick nonferromagnetic elastomeric material at its surface coverage 30mm, probe lies against on rubber, backing plate 1 both sides plastic clamp I 14, fixture II 15 are fixed, record the magnetic field size, increase subsequently 30mm coating thickness recording magnetic field size, utilize two groups of magnetic field values that record and corresponding one-tenth-value thickness 1/10 to make the straight line of magnetic field with variation in thickness, the X-axis of straight line is magnetic field value, and Y-axis is one-tenth-value thickness 1/10;
The 3rd step is popped one's head in and is placed in ball-type rubber coatings 13 surfaces and fixes by plastic clamp I 14, fixture II 15 equally, the recording magnetic field size, and the corresponding position in step 2 straight line of this value, calculate the Y-axis value, is spheroid rubber coatings thickness.
Claims (7)
1. the wide range Magnetic gaugemeter device of the non magnetic coating of ferromagnetic component, it comprises backing plate, magneto-dependent sensor, the first permanent magnet, the second permanent magnet, the bar shaped yoke, the probe connecting line, treatment circuit, signal acquisition module, computer acquisition measurement mechanism and probing shell, it is characterized in that, the upper end of the upper end of the first permanent magnet and the second permanent magnet is connected to bar shaped yoke two ends, the lower end of the lower end of the first permanent magnet and the second permanent magnet is fixedly connected on backing plate, magneto-dependent sensor is between the first permanent magnet and the second permanent magnet, and be fixed on backing plate, the probe data line is connected between magneto-dependent sensor and treatment circuit, be connected with signal acquisition module between treatment circuit and computer acquisition measurement mechanism, magneto-dependent sensor, the first permanent magnet, the second permanent magnet and bar shaped yoke all are positioned at the space of probing shell and backing plate formation, described backing plate is the nonferromagnetic hard material.
2. the wide range Magnetic gaugemeter device of the non magnetic coating of a kind of ferromagnetic component as claimed in claim 1, is characterized in that, described the first permanent magnet, the second permanent magnet and bar shaped yoke connect and compose U-shaped yoke.
3. the wide range Magnetic gaugemeter device of the non magnetic coating of a kind of ferromagnetic component as claimed in claim 1, is characterized in that, described the first permanent magnet is relative with the second permanent magnet heteropole, the middle parallel magnetic field that forms.
4. the wide range Magnetic gaugemeter device of the non magnetic coating of a kind of ferromagnetic component as claimed in claim 1, is characterized in that, the sensitive area normal parallel of described magneto-dependent sensor is in the ferromagnetic component surface, and perpendicular to U-shaped yoke bipod line.
5. the wide range Magnetic gaugemeter device of the non magnetic coating of a kind of ferromagnetic component as claimed in claim 1, is characterized in that, described treatment circuit comprises signal first order amplification module, signal second level amplification module and filtration module.
6. the detection method of the wide range Magnetic gaugemeter device of the non magnetic coating of ferromagnetic component, is characterized in that, described detection method comprises the steps:
(1) step is made probe, identical two rectangle permanent magnet different poles is adsorbed on relatively respectively to bar shaped yoke two ends and forms U-shaped yoke, magneto-dependent sensor is positioned in the middle of permanent magnet, and connects treatment circuit by the connecting line of popping one's head in;
The probe that (2) step utilization is made is demarcated, use the material identical with tested component inside ferrimagnet, nonferromugnetic material in its surface coverage known thickness, probe keeps flat and records the magnetic field size, rear increase coating thickness recording magnetic field size, utilize two groups of magnetic field values that record and corresponding one-tenth-value thickness 1/10 to make the Trendline of magnetic field with variation in thickness;
(3) step actual measurement, probe lies against tested clad surface, and the recording magnetic field size, contrast the position of this value in step 2 Trendline, calculates coating thickness.
7. the detection method of the wide range Magnetic gaugemeter device of the non magnetic coating of a kind of ferromagnetic component as claimed in claim 1, is characterized in that, described U-shaped yoke steadily is positioned over clad surface in use.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108507504A (en) * | 2018-04-13 | 2018-09-07 | 徐州工程学院 | The device and its application method of friction welding (FW) weldment excircle dimension are measured for ultrasonic method |
| CN110672001A (en) * | 2019-10-24 | 2020-01-10 | 中航通飞华南飞机工业有限公司 | Method and device for measuring thickness of non-ferromagnetic material on surface of ferromagnetic material |
| CN112444219A (en) * | 2020-12-31 | 2021-03-05 | 爱德森（厦门）电子有限公司 | Non-contact ultrasonic electromagnetic coating thickness measuring method and detection device thereof |
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| GB2311615A (en) * | 1996-03-20 | 1997-10-01 | Peter Thomas Ormiston | Measuring the thickness of a coating |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108507504A (en) * | 2018-04-13 | 2018-09-07 | 徐州工程学院 | The device and its application method of friction welding (FW) weldment excircle dimension are measured for ultrasonic method |
| CN110672001A (en) * | 2019-10-24 | 2020-01-10 | 中航通飞华南飞机工业有限公司 | Method and device for measuring thickness of non-ferromagnetic material on surface of ferromagnetic material |
| CN112444219A (en) * | 2020-12-31 | 2021-03-05 | 爱德森（厦门）电子有限公司 | Non-contact ultrasonic electromagnetic coating thickness measuring method and detection device thereof |
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