CN104330460A - Device and method for detecting high-strength steel - Google Patents
Device and method for detecting high-strength steel Download PDFInfo
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- CN104330460A CN104330460A CN201410674004.8A CN201410674004A CN104330460A CN 104330460 A CN104330460 A CN 104330460A CN 201410674004 A CN201410674004 A CN 201410674004A CN 104330460 A CN104330460 A CN 104330460A
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Abstract
The invention relates to the technical field of nondestructive testing equipment and in particular relates to a device and a method for detecting high-strength steel. The device comprises a signal generator, a detection probe, a signal amplifier, a signal acquisition card and a power amplifier electrically connected with the signal generator, wherein the detection probe comprises a U-shaped low-frequency magnetic core; the method comprises the following steps: firstly collecting Barkhausen electromagnetic signals obtained by detecting standard high-strength test samples different in strength; and next, establishing a calibration curve, putting the probe tightly against the surface of the tested hot-formed high-strength steel, keeping the detection probe stable, measuring the Barkhausen electromagnetic signal characteristic value of the tested portion of the high-strength steel part, and calculating the mechanical properties according to the calibration curve. A nondestructive detection method applicable to the mechanical properties of cold-formed and hot-formed high-strength steel parts is developed based on the Barkhausen noise phenomenon of a ferromagnetic substance; the nondestructive detection method is capable of realizing single-point measurement within several seconds, and is also self-adaptive to the complex outlines of the parts and high in practicability.
Description
Technical field
The present invention relates to non-destructive detecting device technical field, refer in particular to a kind of pick-up unit and detection method thereof of high-strength steel.
Background technology
As the safety component of body of a motor car, the mechanical property such as intensity, hardness, unrelieved stress of cold forming and thermoforming high-strength steel part evaluates the important indicator of its performance, and its mechanical property how can be detected rapidly in production scene, become an inevitable problem.The intensity of steel plate, refers to that the ability producing elastic deformation, plastic yield and fracture resisted under external force by material, comprises yield strength and tensile strength, usually obtained by tension test.Tension test refers to is bearing the test method measuring material behavior under axial tensile loads, and the step of metal tensile test can see ASTM E-8 standard and GB GB/T228.1-2010.Hardness is the ability that opposing hard object in material local is pressed into its surface, the hardness of high-strength steel part uses Rockwell hardometer, Vickers or Brinell tester to measure usually, and these methods are all resist caused amount of plastic deformation when another object is pressed into by measurement material surface to evaluate hardness number.The measurement of unrelieved stress uses Blind Hole Method usually, its principle is that primary stress field is in the state of the equilibrium holed, destroy original stress equilibrium state and stress is redistributed, thus make the metal of Near Circular Hole In A be subjected to displacement or strain, dependent variable after being holed by strain-ga(u)ge measurement, just can calculate the stress value of former stress field.
When measuring the intensity of formation of parts by standard tensile test, there is following shortcoming: one, cut sample and irreversible damage is caused to part; Two, sample preparation and the characterization processes cycle longer; Three, the intensity of the curved surface area of part or sample can not be detected; Four, can not the intensity of continuous detecting part adjacent area.
During by Durometer measurements formation of parts hardness, there is following shortcoming: one, sclerometer can produce irreversible damage to piece surface; Two, the part that unsuitable measurement volumes is larger.
During by blind hole measuring formation of parts unrelieved stress, there is following shortcoming: one, irreversible damage is produced to piece surface; Two, test period is longer.
In sum, when testing the intensity of plate by tension test, need the tensile sample of plane sheet metal parts being cut into standard, thus irreversible damage is produced to part, and the test duration is longer, tension test can not be carried out to curved portion.During by Durometer measurements hardness, sclerometer can produce impression at surface of steel plate.During by blind hole measuring unrelieved stress, need to punch at surface of steel plate.Therefore these detection methods all can produce damage to part.Owing to having above shortcoming, these methods should not be used for the on-the-spot Fast nondestructive evaluation of high-strength part mechanical property, and defect is obvious.
Summary of the invention
It is accurate that the technical problem to be solved in the present invention is to provide a kind of mechanics properties testing, convenient to operation, and tested part is not produced to pick-up unit and the detection method thereof of the high-strength steel of any damage.
In order to solve the problems of the technologies described above, the present invention adopts following technical scheme: a kind of pick-up unit of high-strength steel, the power amplifier comprising signal generator, detection probe and be electrically connected with signal generator, detection probe is connected with signal amplifier, this signal amplifier is connected with data acquisition card, described detection probe comprises U-shaped low frequency core, and two longitudinal rods of this U-shaped low frequency core are all set with magnetizing coil, and two magnetizing coils are all electrically connected with described power amplifier; Be equiped with high frequency magnetic core and the elastic fixing device for installing fixing high frequency magnetic core in the middle of the bottom of described two longitudinal rods, this high frequency magnetic core is electrically connected with described signal amplifier.
Preferably, described U-shaped low frequency core is cut into multiple U-shaped sheet material by ferromagnetic material sheet and is folded and forms.
Preferably, described ferromagnetic material sheet is pure iron sheet, low-carbon (LC) steel disc, siliconized plate or iron-nickel alloy sheet.
Preferably, described elastic fixing device is Compress Spring or rubber.
Preferably, described elastic fixing device is between described two magnetizing coils.
Use a detection method for the pick-up unit of high-strength steel, comprise the steps:
Step 1: use the standard high-strength steel sample of pick-up unit to varying strength of high-strength steel to carry out the detection of strength/hardness, collect the Barkhausen's electromagnetic signal obtained when detecting;
Step 2: extract electromagnetic signal peak value and root mean square as eigenwert, set up the calibration curve between Barkhausen's electromagnetic signal eigenwert and strength/hardness, and store calibration curve data;
Step 3: after thermoforming high-strength steel part forming, is close to the surface of tested thermoforming high-strength steel, presses described detection probe all can be close to tested position surface to the lower end of longitudinal rod and the lower end of high frequency magnetic core by probe;
Step 4: keep described detection probe to stablize, measures Barkhausen's electromagnetic signal eigenwert at the tested position of high-strength steel part, and calculates the strength/hardness of tested high-strength steel part according to calibration curve.
Wherein, described intensity comprises yield strength and tensile strength.
Beneficial effect of the present invention is: the pick-up unit and the detection method thereof that the invention provides a kind of high-strength steel, the present invention is based on Barkhausen noise (also the claiming Barkhausen's electromagnetic signal) phenomenon that ferromagnetic material has, develop the lossless detection method that one can be used for cold forming and thermoforming high-strength steel part mechanical property (intensity, hardness, unrelieved stress), the measurement of single-point can not only be realized within the time of several seconds, the profile of part complexity can be adaptive to simultaneously, practical.
Accompanying drawing explanation
Fig. 1 is the module frame chart of the pick-up unit of high-strength steel of the present invention.
The detection probe structural representation of the pick-up unit of Fig. 2 high-strength steel of the present invention.
Fig. 3 uses the pick-up unit of high-strength steel of the present invention to detect thermoforming high-strength steel part strength schematic diagram.
Fig. 4 uses the pick-up unit of high-strength steel of the present invention to detect thermoforming high-strength steel part hardness schematic diagram.
In figure, Reference numeral is as follows:
1---detection probe; 2---magnetizing coil; 3---magnetic test coil; 4---elastic fixing device; 5---tested steel; 6---signal generator; 7---power amplifier; 8---signal amplifier; 9---data acquisition card; 10---computing machine; 11---low frequency core; 12---coil winding; 13---high frequency magnetic core; 14---coil winding; 15---thermoforming high-strength steel part A; 16---thermoforming high-strength steel part B.
Embodiment
For the ease of the understanding of those skilled in the art, below in conjunction with embodiment and accompanying drawing, the present invention is further illustrated, and the content that embodiment is mentioned not is limitation of the invention.
As depicted in figs. 1 and 2, a kind of pick-up unit of high-strength steel, the power amplifier 7 comprising signal generator 6, detection probe 1 and be electrically connected with signal generator 6, detection probe 1 is connected with signal amplifier 8, this signal amplifier 8 is connected with data acquisition card 9, described detection probe 1 comprises U-shaped low frequency core 11, and two longitudinal rods of this U-shaped low frequency core 11 are all set with magnetizing coil 2, and two magnetizing coils 2 are all electrically connected with described power amplifier 7; Be equiped with high frequency magnetic core 13 and the elastic fixing device 4 for installing fixing high frequency magnetic core 13 in the middle of the bottom of described two longitudinal rods, this high frequency magnetic core 13 is electrically connected with described signal amplifier 8.
In the present embodiment, described U-shaped low frequency core 11 is cut into multiple U-shaped sheet material by ferromagnetic material sheet and is folded and forms.
Preferably, described ferromagnetic material sheet is pure iron sheet, low-carbon (LC) steel disc, siliconized plate or iron-nickel alloy sheet, and described elastic fixing device 4 is Compress Spring.
Pick-up unit herein in invention is made up of signal generator 6, power amplifier 7, magnetizing coil 2, magnetic test coil, power amplifier 7, signal amplifier 8 and capture card, during use, is connected by pick-up unit of the present invention, as shown in Figure 1 with computing machine 10.Magnetizing coil 2 and magnetic test coil form probe jointly, as shown in Figure 2.Magnetizing coil 2 is made up of low frequency core and coil winding.There is provided sine voltage signal by signal generator 6, after power amplifier 7, produce enough large electric current drive magnetizing coil 2, by magnetizing coil 2, alternating magnetic field is applied to tested surface of steel plate, thus excite Barkhausen's electromagnetic signal.Magnetic test coil is made up of high frequency magnetic core 13 and coil winding, for receiving the field signal of specimen surface.Magnetic test coil is installed in the middle of magnetizing coil 2 by the stationary installation that Compress Spring or rubber are made.In the process using probe measurement piece surface, by Compress Spring or highly elastic material device, make the bottom of magnetizing coil 2 and magnetic test coil can be close to the surveyed area of plane and curved surface.Barkhausen signal is amplified by signal amplifier 8, and enters computing machine 10 by data collecting card, and has been undertaken gathering and analysis task by software module.The step being measured thermoforming high-strength steel part by the present invention is as described below:
Step 1: use the standard high-strength steel sample of pick-up unit to varying strength of high-strength steel to carry out the detection of strength/hardness, collect the Barkhausen's electromagnetic signal obtained when detecting; Sine voltage signal is provided to encourage by signal generator 6 and power amplifier 7, alternating magnetic field is produced in magnetizing coil 2, when probe is close to surface of steel plate, the magnetic domain neticdomain wall of steel plate inside is moved, when the movement of neticdomain wall run into crystal boundary, dislocation, non magnetic to be mingled with etc. obstruction time, just can produce Barkhausen's electromagnetic signal; Receive Barkhausen's electromagnetic signal by magnetic test coil and be sent to computing machine 10 after signal is amplified, and storing and signal transacting eventually through computing machine 10.
Step 2: by computing machine 10 extract electromagnetic signal peak value and root mean square as eigenwert, set up the calibration curve between Barkhausen's electromagnetic signal eigenwert and strength/hardness, and store calibration curve data;
Step 3: after thermoforming high-strength steel part forming, probe is close to the surface of tested thermoforming high-strength steel, the surface at tested position all can be close in the lower end of the lower end and high frequency magnetic core 13 that press described detection probe 1 to longitudinal rod;
Step 4: keep described detection probe 1 to stablize, computing machine 10 gathers and measures Barkhausen's electromagnetic signal eigenwert at the tested position of high-strength steel part, and calculates tested high-strength steel part 5 strength/hardness according to calibration curve.
Wherein, described intensity comprises yield strength and tensile strength, and described elastic fixing device 4 is between described two magnetizing coils 2.
The present invention is based on Barkhausen noise (also the claiming Barkhausen's electromagnetic signal) phenomenon that ferromagnetic material has, develop the lossless detection method that one can be used for cold forming and thermoforming high-strength steel part mechanical property (intensity, hardness, unrelieved stress), the measurement of single-point can not only be realized within the time of several seconds, the profile of part complexity can be adaptive to simultaneously, practical.
The present invention's case is in actual applications shown in following examples.
Embodiment one, be illustrated in figure 3 the thermoforming front anti-collision beam part of certain automobile, in order to measure its yield strength and tensile strength, process is as follows:
First, use this pick-up unit, gather Barkhausen's electromagnetic signal with the standard high-strength steel sample of varying strength, obtain the calibration curve of Barkhausen's electromagnetic signal eigenwert and intensity (yield strength and tensile strength) respectively, and store data.
Secondly, after part forming, probe is close to the surface of tested thermoforming high-strength steel part 15, when measuring curved surface, pressing probe makes spring-compressed, thus ensures that the surface at tested position all can be close in the bottom of magnetizing coil 2 and magnetic test coil.
Finally, keep probe stationary, measure Barkhausen's electromagnetic signal eigenwert at the tested position of part, and calculate yield strength and tensile strength according to calibration curve.
Embodiment two, be illustrated in figure 4 the thermoforming front anti-collision beam part of certain automobile, in order to measure its hardness, process is as follows:
First, use this pick-up unit, gather Barkhausen's electromagnetic signal with the standard high-strength steel sample of different hardness, obtain the calibration curve of Barkhausen's electromagnetic signal eigenwert and hardness respectively, and store data.
Secondly, after part forming, probe is close to the surface of tested thermoforming high-strength steel part 16, when measuring curved surface, pressing probe makes spring-compressed, thus ensures that the surface at tested position all can be close in the bottom of magnetizing coil 2 and magnetic test coil.
Finally, keep probe stationary, Barkhausen's electromagnetic signal eigenwert at the tested position of part, and calculate hardness according to calibration curve.
It should be added that, described elastic fixing device 4 can also substitute Compress Spring with rubber, equally also can realize above-mentioned technique effect.
Above-described embodiment is the present invention's preferably implementation, and in addition, the present invention can also realize by alternate manner, and under the prerequisite not departing from the technical program design, any apparent replacement is all within protection scope of the present invention.
Claims (7)
1. the pick-up unit of a high-strength steel, comprise signal generator (6), detection probe (1 and the power amplifier (7) that is electrically connected with signal generator (6), detection probe (1) is connected with signal amplifier (8), this signal amplifier (8) is connected with data acquisition card (9), it is characterized in that: described detection probe (1) comprises U-shaped low frequency core (11), two longitudinal rods of this U-shaped low frequency core (11) are all set with magnetizing coil (2), and two magnetizing coils (2) are all electrically connected with described power amplifier (7);
Be equiped with high frequency magnetic core (13) and the elastic fixing device (4) for installing fixing high frequency magnetic core (13) in the middle of the bottom of described two longitudinal rods, this high frequency magnetic core (13) is electrically connected with described signal amplifier (8).
2. the pick-up unit of a kind of high-strength steel according to claim 1, is characterized in that: described U-shaped low frequency core (11) is cut into multiple U-shaped sheet material by ferromagnetic material sheet and folded and forms.
3. the pick-up unit of a kind of high-strength steel according to claim 2, is characterized in that: described ferromagnetic material sheet is pure iron sheet, low-carbon (LC) steel disc, siliconized plate or iron-nickel alloy sheet.
4. the pick-up unit of a kind of high-strength steel according to claim 1, is characterized in that: described elastic fixing device (4) is Compress Spring or rubber.
5. the pick-up unit of a kind of high-strength steel according to claim 4, is characterized in that: described elastic fixing device (4) is positioned between described two magnetizing coils (2).
6. use a detection method for the pick-up unit of the high-strength steel described in claim 1 to claim 5 any one, it is characterized in that comprising the steps:
Step 1: use the standard high-strength steel sample of pick-up unit to varying strength of high-strength steel to carry out the detection of strength/hardness, collect the Barkhausen's electromagnetic signal obtained when detecting;
Step 2: extract electromagnetic signal peak value and root mean square as eigenwert, set up the calibration curve between Barkhausen's electromagnetic signal eigenwert and strength/hardness, and store calibration curve data;
Step 3: after thermoforming high-strength steel part forming, is close to the surface of tested thermoforming high-strength steel, presses described detection probe (1) all can be close to tested position surface to the lower end of longitudinal rod and the lower end of high frequency magnetic core (13) by probe;
Step 4: keep described detection probe (1) to stablize, measure Barkhausen's electromagnetic signal eigenwert at the tested position of high-strength steel part, and calculate the strength/hardness of tested high-strength steel part (5) according to calibration curve.
7. the detection method of the pick-up unit of high-strength steel according to claim 6, is characterized in that: described intensity comprises yield strength and tensile strength.
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| CN201410674004.8A CN104330460A (en) | 2014-11-21 | 2014-11-21 | Device and method for detecting high-strength steel |
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Cited By (8)
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| CN106018541A (en) * | 2016-05-15 | 2016-10-12 | 北京工业大学 | Lead screw thread bottom hardness micro-magnetic nondestructive detection method |
| CN106841561A (en) * | 2017-01-06 | 2017-06-13 | 无锡职业技术学院 | The lossless hardness measuring device of hardened steel and method |
| CN107315910A (en) * | 2017-06-19 | 2017-11-03 | 苏州热工研究院有限公司 | The lossless detection method of iron copper series alloy heat ageing state estimation |
| CN109030617A (en) * | 2018-08-16 | 2018-12-18 | 中国人民解放军国防科技大学 | Barkhausen effect-based magnetic characteristic detection method and device for magnetic suspension track |
| CN109142057A (en) * | 2018-09-11 | 2019-01-04 | 北京工业大学 | The Barkhausen noise non-destructive measuring method and system of ferrimagnet local stress and strain field |
| CN109407018A (en) * | 2018-09-11 | 2019-03-01 | 北京工业大学 | High-resolution Barkhausen noise and incremental permeability scanning imaging system |
| CN111964817A (en) * | 2020-07-08 | 2020-11-20 | 中国特种设备检测研究院 | Plane stress determination method and device based on magnetic Barkhausen noise |
| CN114113294A (en) * | 2020-08-28 | 2022-03-01 | 宝山钢铁股份有限公司 | Online measuring device and method for determining yield strength and tensile strength of strip steel |
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Cited By (9)
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| CN109407018A (en) * | 2018-09-11 | 2019-03-01 | 北京工业大学 | High-resolution Barkhausen noise and incremental permeability scanning imaging system |
| CN111964817A (en) * | 2020-07-08 | 2020-11-20 | 中国特种设备检测研究院 | Plane stress determination method and device based on magnetic Barkhausen noise |
| CN114113294A (en) * | 2020-08-28 | 2022-03-01 | 宝山钢铁股份有限公司 | Online measuring device and method for determining yield strength and tensile strength of strip steel |
| CN114113294B (en) * | 2020-08-28 | 2023-12-12 | 宝山钢铁股份有限公司 | Online measuring device and method for determining yield strength and tensile strength of strip steel |
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