CN110530978A - High temperature forge piece persistently detects electromagnetic ultrasonic probe, failure detector and method of detection - Google Patents
High temperature forge piece persistently detects electromagnetic ultrasonic probe, failure detector and method of detection Download PDFInfo
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- CN110530978A CN110530978A CN201910796821.3A CN201910796821A CN110530978A CN 110530978 A CN110530978 A CN 110530978A CN 201910796821 A CN201910796821 A CN 201910796821A CN 110530978 A CN110530978 A CN 110530978A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/24—Probes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention discloses high temperature forge pieces persistently to detect electromagnetic ultrasonic probe, failure detector and method of detection, forge piece electromagnetic ultrasonic probe includes probing shell, it is set to the intracorporal permanent magnet of chamber of probing shell, excitation/the receiving coil being set to below probing shell outer bottom, excitation/receiving coil is the spiral winding parallel with probing shell bottom of conducting wire coiling, and the silver wire that conducting wire uniformly smears ceramic coating by more is bundled into cluster and forms；Magnetic support is provided with below permanent magnet, the central axes of magnetic support are vertical with plane where excitation coil；Probing shell side wall is provided with several pump mouths close to bottom, is provided with water inlet at the top of probing shell, and the cavity between probing shell and permanent magnet and magnetic support constitutes water circulating cooling channel.Conducting wire and its arrangement, magnetic support and three kinds of water cooling designs is made in the silver wire that multiply uniformly smears ceramic layer, enables it to realize that 650 DEG C of high temperature forge pieces persistently detect, and improves conversion efficiency, reduces lift-off sensibility and reduce detection blind area.
Description
Technical field
It the present invention relates to the use of electromagnetic acoustic bulk wave and persistently detect high-temperature metal forge piece internal flaw technical field, specifically
It is that a kind of high temperature forge piece persistently detects electromagnetic ultrasonic probe, failure detector and method of detection.
Background technique
With the accelerated development of Chinese industrial, demand of the China to heavy casting and forging is growing day by day, to heavy casting and forging
Quality requirement is also being continuously improved.Forge piece under the condition of high temperature is carried out non-destructive testing, can find defect as early as possible, in real time
Defect is monitored and controlled, and according to defect information, improves processing technology in real time, realizes defect by improving swaging deformation degree
Elimination and inhibition.Secondary forging can be melted down to the defect that can not be still eliminated by improving forging deformation in time, avoid adding again
Energy consumption and personnel's waste when hot, can be significantly increased yield rate and production efficiency, realize green manufacturing and environmental protection system
It makes.
Conventional piezoelectric supersonic detection method needs are smooth on surface, could reach under conditions of the couplants such as painting organic oil, water
To preferable detection effect.Under the high temperature conditions, piezoelectric chip piezoelectric effect decrease sharply, couplant it is unstable volatile or
Coupling efficiency is low, and therefore, conventional piezoelectric ultrasonic detecting technology almost cannot achieve 300 DEG C or more high temperature forge pieces and persistently detect.
Electromagnetic acoustic detection technique is suitble to the work under high temperature, rough surface environment as a kind of new non-destructive testing technology
Make, it have the characteristics that it is non-contact, be not necessarily to couplant, be easy excitated various ultrasonic waveforms, safe and reliable, convenient.Electromagnetic acoustic
Probe has the characteristics that easily to design, low manufacture cost, and transducing mechanism is Lorentz force, magnetostriction and three kinds of magnetizing force.It is high
Under the conditions of temperature, for the ferromagnetism forge piece such as steel, usual Lorentz force and magnetostrictive force collective effect；For copper, aluminium etc.
Nonferromagnetic forge piece, usually using Lorentz force as leading role.
The patent report about high-temperature electromagnetic ultrasound bulk wave method of detection and its device mainly has following at present:
Number of patent application CN105758938A authorize " 550 DEG C of high temperature metallic material electromagnetic acoustic bulk wave methods of detection and
Its device ", the patent realize 550 DEG C of height using the ceramic silver wire circle and high temperature resistant N~AH SmCo permanent magnet of transceiver
The long-time of warm metal material internal flaw detects.
Number of patent application CN205538843U discloses " a kind of high temperature resistant impulse mgnet formula electromagnetic ultrasonic probe ", passes through
Designing different electromagnet structures can be realized shear wave, longitudinal wave detection, be promoted to the detectability of defect, and using " under into
Water circulation channel down out " can carry out long-time detection to high temperature, large-scale ferromagnetism forging.
Number of patent application CN108088907A authorizes a kind of " high temperature pipe hurt on-line monitoring system based on electromagnetic acoustic
System ", which is capable of the distribution situation of the defect in pipeline of fast checking relatively long distance, and probe and ware circuit is long
Phase is mounted on pipeline, can acquire and store a large amount of data, by the comprehensive analysis to data, improve system sensitivity and
The reliability of testing result.
Number of patent application CN105571708A devises " supersonic high temperature detects sound velocity calibration equipment ", which can be pre-
If in temperature range, being corrected to the ultrasonic propagation velocity in test object, solves ultrasonic wave and detected in high-temperature service
When, the lower problem of precision.
Number of patent application CN108872401A authorizes " a kind of electromagnetic acoustic shear wave probe and its system resistant to high temperatures, wear-resisting
Make method ", which is equipped with the hydrologic cycle cooling system of " bottom in and top out water ", and coil lower end surface has protection wear-resistant coating.In
When detecting ferrimagnet under high temperature, conversion efficiency, which both can be improved, can also make coil block against damages, can extend its use
Service life.
Although the above patent can be applied in high temperature detection field, comparatively, they only account for probe designs
Local optimum not from the lift-off sensibility of probe, improves the conversion efficiency of probe and reduces Quick-return time, high temperature shape
State is lauched circulating cooling effect, bias magnetic field congregational rate etc. and carries out globality and integration design, is especially reducing probe
Lift-off sensibility, improve the conversion efficiency of probe in terms of, its lift-off of existing technology sensibility is high, and conversion efficiency is lower, and
And it is also difficult to realize persistently detect under high temperature in existing technology.
Summary of the invention
The present invention proposes that a kind of high temperature forge piece persistently detects electromagnetic ultrasonic probe, failure detector and method of detection, with solution
Certainly lift-off sensibility is high in the related technology, and the conversion efficiency of electromagnetic ultrasonic probe is lower and can not achieve lasting under 650 DEG C of high temperature
The problem of detection.
The first aspect of the present invention provides a kind of forge piece electromagnetic ultrasonic probe, including probing shell, is set to described
The intracorporal permanent magnet of the chamber of probing shell, the excitation coil and receiving coil being set to below the probing shell outer bottom, institute
It states excitation coil and receiving coil is the helical coil structure parallel with the probing shell bottom of conducting wire coiling, it is described
The silver wire that conducting wire uniformly smears ceramic coating by 3~35 is bundled into cluster and forms；High temperature resistant is provided with below the permanent magnet
Magnetic support, the central axes of the magnetic support are vertical with plane where the excitation coil；The probing shell side wall is arranged close to bottom
There are several pump mouths, water inlet, the probing shell and the permanent magnet and the magnetic are provided at the top of the probing shell
Cavity between seat constitutes water circulating cooling channel.
The silver wire that ceramic coating is uniformly smeared as multiply is bundled into spiral winding made of cluster coiling and has the advantage that
In the high temperature environment, ceramic insulation is reliable, is not easy to puncture and form noise；Silver wire surface is not easily formed oxide layer, helix
Enclose impedance in the high temperature environment will not change dramatically, electromagnetic acoustic exciting circuit and receive circuit power distribution it is unaffected；
The spiral winding as made of multiply ceramics silver-colored coil winding is directly placed at the bottom of high-temperature electromagnetic ultrasonic probe, on the one hand may be used
To reduce lift off, another aspect ceramic coating is wear-resisting, good heat-insulation effect, is suitble to rough surface high temperature forge piece.Using water
Circulating cooling system carries out pressure cooling to the permanent magnet in high temperature resistant electromagnetic ultrasonic probe, and using the low conductance of high magnetic permeability
High temperature resistant magnetic support made of rate material increases permanent magnet distance while not weakening biasing magnetic induction intensity seriously as far as possible
The distance of high temperature forge piece, it is ensured that permanent magnet is still capable of providing stronger bias magnetic field in the high temperature environment.
Magnetic support is by increasing the distance of permanent magnet distance high-temperature forge piece, it is ensured that permanent magnet is in the high temperature environment still
It is capable of providing stronger bias magnetic field, and hydrologic cycle cooling system is sustainable carries out forced cooling to magnetic support and permanent magnet, thus
Realize that permanent magnet can continue to provide stronger bias magnetic field in the high temperature environment；As made of the silver-colored coil winding of multiply ceramics
Spiral winding is directly placed at the bottom of high-temperature electromagnetic ultrasonic probe, and ceramic coating is wear-resisting, good heat-insulation effect, in hot environment
In, ceramic insulation is reliable, is not easy to puncture and form noise, silver wire surface is not easily formed oxide layer, and spiral winding impedance is in height
In warm environment will not change dramatically, electromagnetic acoustic exciting circuit and the power distribution for receiving circuit are unaffected, so be able to achieve
Excitation coil and receiving coil can continue to work normally under hot environment, lasting to generate and receive ultrasonic wave.Thus in high temperature
Under environment, the permanent magnet of the probe can continue to provide stronger bias magnetic field, and excitation coil and receiving coil can continue to produce
Raw and receive ultrasonic wave, that is, realizing the probe can be realized lasting detection to high temperature forge piece, the experiment proved that, the electricity
Magnetic ultrasonic probe may be implemented persistently to detect in 650 DEG C of high temperature forge piece.And existing electromagnetic ultrasonic probe design, forever
Magnet can only realize that bias magnetic field is stablized in the offer in the short time under high temperature environment, and excitation coil and receiving coil are in high temperature
Also ultrasonic wave can only be generated and received under environment in the short time, existing electromagnetic ultrasonic probe high-temperature resistance is poor, cannot achieve
Lasting detection is carried out under hot environment.
In addition, the current distribution is uneven of conductor is even when having alternating current or alternating electromagnetic field in conductor, electric current collection
In in " skin " part of conductor, that is to say, that current convergence is in the thin layer of conductor appearance, and closer to conductive surface, electric current is close
Degree is bigger, and conductor actually electric current is smaller.As a result increase the resistance of conductor, increase its loss power also.As general
A piece conducting wire being relatively large in diameter is changed to the form of multiply ceramics silver wire circle binding, it is ensured that electric current passes through multiply ceramics silver wire
The cross sectional current density of each small conducting wire of circle is close to uniform, to improve the wire sectional of multiply ceramics silver wire circle
Face utilization rate is further able to improve the conversion efficiency of electromagnetic ultrasonic probe.When electric current is in each of multiply ceramics silver wire circle
The cross section of small conducting wire is close to when being uniformly distributed, and at this time the impedance comparison of coil is stablized, when electromagnetic ultrasonic probe and high temperature are cast
When the lift off of forging changes, since lift off variation bring impedance variations are smaller relative to the impedance influences of coil,
So as to reduce the lift-off sensibility of electromagnetic ultrasonic probe.
Further, the silver wire line footpath is 0.015mm~0.08mm, the thickness for the ceramic coating that the silver wire surface is smeared
Degree is 0.03mm~0.07mm, and the wire external layer is coated with the high-temperature plastic of 0.05mm~0.1mm thickness.According to specific frequency
Rate, the ratio that the thickness and silver wire diameter that ceramic layer is arranged meet, but the conversion efficiency highest of electromagnetic ultrasonic probe.
Further, the receiving coil is connected in series by multiple spiral winding head and the tail, and the receiving coil is multiple
Spiral winding was around the excitation coil one week.
Multiple spiral windings of receiving coil can not only increase receiving coil and connect around the excitation coil design in one week
The area of ultrasonic wave is received, and can satisfy the impedance for reducing excitation coil and increase the requirement of the impedance of receiving coil, thus
The exciting current of electromagnetic ultrasonic probe and effective receiving wire length of receiving coil are improved, to improve electromagnetic ultrasonic probe
Conversion efficiency, on the other hand, excitation coil and receiving coil are using horizontal positioned form rather than are disposed vertically, and can subtract
Small excitation coil is formed by electromagnetic crosstalk to the interference effect of receiving coil when amplitude radio-frequency current motivates, and avoids
Preamplifier input terminal forms the pulse electromagnetic impact of big intensity, causes preamplifier to be difficult Quick-return, can reduce
Detection blind area, while making an uproar of being formed in receiving coil of the internal oscillator evanescent voltage signal that electromagnetic acoustic power amplifier can be reduced
Sound, to improve signal-to-noise ratio.
Further, the magnetic support bottom is indent spherical structure, which can provide the permanent magnet
Divergence expression bias magnetic field focusing make it perpendicular to the excitation coil.Magnetic support bottom is that indent spherical structure can send out script
It dissipates formula bias magnetic field to focus, it is made as far as possible perpendicular to excitation coil and receiving coil, shear wave purity can be increased substantially, kept away
The interference of longitudinal wave and its mode converted wave to reception shear wave signal is exempted from, while having avoided forming ultrasonic wave inside permanent magnet, has mentioned
High shear wave purity and signal-to-noise ratio.
Further, for intaking, several pump mouths connect the water pump that draws water and are taken out the water inlet connection water pipe
Ability of swimming water outlet.Using water-drawing type water-cycling mode, negative pressure can be formed, high temperature resistant electromagnetic ultrasonic probe can be reduced to high temperature
The requirement sealed in environment, avoid due to elevated-temperature seal it is poor caused by seepy question.
Further, the probing shell includes main casing and the upper cover at the top of the main casing, the upper base
Portion is provided with the locating support for fixing the permanent magnet.Permanent magnet is fixed by locating support, probe is can avoid and occurs
When vibration permanent magnet deviate or the cooled water impact of permanent magnet and deviate, it is ensured that stability when work.
Further, the probing shell is made of brass, and the probing shell bottom thickness is 0.2mm~1mm.Root
Different thickness is selected according to different ultrasonic frequencies, can be eliminated the possibility for generating ultrasonic wave in probing shell bottom, be reduced
Interference.
Further, the permanent magnet is the Nd-Fe-B permanent magnet or samarium cobalt permanent magnet body of cylindrical body, and the magnetic support is perm
One of alloy, iron-nickel alloy, MnZn ferrite material is made.Nd-Fe-B permanent magnet or samarium cobalt permanent magnet body can provide static state
Bias magnetic field, bias magnetic field can be divided into the Bz component perpendicular to coil and be parallel to the Br component of coil, and Bz/Br ratio is bigger,
The shear wave that electromagnetic ultrasonic probe is excited is purer, i.e., shear wave is bigger relative to the ratio of longitudinal wave；Permalloy, iron-nickel alloy or
MnZn ferrite magnetic seat tool has poly- magnetic, insulation, function resistant to high temperature.
The second aspect of the present invention provides a kind of forge piece electromagnetic ultrasonic defect detection device, including above-mentioned probe, and
PC machine, exciting circuit and reception circuit；
The exciting circuit includes sequentially connected DA signal generator, power amplifier, motivates terminal impedance match circuit,
The both ends of the excitation coil of the probe are connect with the excitation terminal impedance match circuit；
The reception circuit includes sequentially connected receiving-end impedance match circuit, preamplifier, filter and AD letter
Number capture card, the both ends of the receiving coil of the probe are connect with the receiving-end impedance match circuit；
The DA signal generator, AD data acquisition card are connect with the PC machine.
High frequency sinusoidal pulse signal is generated after the digital signal of DA signal generator reception PC machine and passes through power amplifier
And impedance matching realizes that the input power of electromagnetic ultrasonic probe excitation coil maximizes, and transversal wave ultrasonic is excited, in test specimens
Surface is propagated from top to bottom, is detected, and ultrasonic signal is converted into after inverse Lorentz force effect or counter magnetostriction effect
Electric signal is received coil reception, after preamplifier amplification, filter filtering, is converted to by AD data acquisition card
Digital signal is shown in PC machine, obtains the time difference between beginning wave and flaw echo, and be calculated according to this defective locations and
Determine the equivalent diameter of defect.Device lift-off sensibility is low, conversion efficiency is high, signal-to-noise ratio is high for this.
The third aspect of the present invention provides a kind of method of detection using above-mentioned forge piece electromagnetic ultrasonic defect detection device,
Include the following steps:
High frequency, high-power sinusoidal impulse string electric current are passed through in excitation coil, so that transversal wave ultrasonic is inspired, along tested
Sample thickness direction is propagated；
Receiving coil receives the electric signal that Ultrasonic transformation is and is converted to digital signal after amplifying, filtering and reaches PC
Machine reads the time difference t between beginning wave and flaw echo；
According to the distance d of formula d=1/2*v*t calculating defect to specimen surface, to complete the positioning analysis of defect, v
For spread speed of the ultrasound in tested sample material；Be modified according to the temperature of tested sample and in advance it is prefabricated flat
The test button in hole carries out flaw echoes comparison, determines the equivalent diameter of defect.
Specifically, high frequency, high-power sinusoidal impulse string electric current are passed through in excitation coil, the high frequency, high-power positive taut pulse
Punching string current signal generates pulse eddy current in tested sample, generates Lorentz force or this kind under bias magnetic field effect
Sinusoidal pulse current signal generates high-frequency alternating magnetic field signal in tested sample, and tested sample surface is made to generate Lorentz force
Or magnetostriction deformation, cause tested sample surface vibration, to inspire transversal wave ultrasonic, is passed along tested sample thickness direction
It broadcasts；
Flaw echo can be generated when transversal wave ultrasonic encounters internal flaw, and reaches the table of tested sample before the wave of bottom
Face, ultrasonic signal, which is converted into current signal after inverse Lorentz force effect or counter magnetostriction effect and is received coil, to be connect
It receives, after preamplifier amplification, filter filtering, digital signal is converted to by AD data acquisition card and is shown in PC machine
On, read the time difference t between beginning wave and flaw echo；
According to the distance d of formula d=1/2*v*t calculating defect to specimen surface, to complete the positioning analysis of defect, v
For spread speed of the ultrasound in tested sample material；Be modified according to the temperature of tested sample and in advance it is prefabricated flat
The test button in hole carries out flaw echoes comparison, determines the equivalent diameter of defect.
Wherein, high frequency, high-power sinusoidal impulse string electric current are 0.5MHz~5MHz, 10 periods~20 cycle sinusoidal pulses
String, electric current 10A~100A.
Beneficial effect
The invention proposes a kind of high temperature forge pieces persistently to detect electromagnetic ultrasonic probe, failure detector and method of detection, by
The silver wire that multiply uniformly smears ceramic layer is bundled into spiral winding made of cluster coiling and has the advantage that in hot environment
In, ceramic insulation is reliable, is not easy to puncture and form noise；Silver wire surface is not easily formed oxide layer, and spiral winding impedance is in height
In warm environment will not change dramatically, electromagnetic acoustic exciting circuit and receive circuit power distribution it is unaffected；By multiply ceramics
Spiral winding made of silver-colored coil winding is directly placed at the bottom of high-temperature electromagnetic ultrasonic probe, on the one hand can reduce lift-off
Distance, another aspect ceramic layer is wear-resisting, good heat-insulation effect, is suitble to rough surface high temperature forge piece.Using hydrologic cycle cooling system
Pressure cooling is carried out to the permanent magnet in high temperature resistant electromagnetic ultrasonic probe, and using made of high magnetic permeability material of low conductivity
High temperature resistant magnetic support increases permanent magnet distance high-temperature forge piece while not weakening biasing magnetic induction intensity seriously as far as possible
Distance, it is ensured that permanent magnet is still capable of providing stronger bias magnetic field in the high temperature environment.
Magnetic support is by increasing the distance of permanent magnet distance high-temperature forge piece, it is ensured that permanent magnet is in the high temperature environment still
It is capable of providing stronger bias magnetic field, and hydrologic cycle cooling system is sustainable carries out forced cooling to magnetic support and permanent magnet, thus
Realize that permanent magnet can continue to provide stronger bias magnetic field in the high temperature environment；As made of the silver-colored coil winding of multiply ceramics
Spiral winding is directly placed at the bottom of high-temperature electromagnetic ultrasonic probe, and ceramic coating is wear-resisting, good heat-insulation effect, in hot environment
In, ceramic insulation is reliable, is not easy to puncture and form noise, silver wire surface is not easily formed oxide layer, and spiral winding impedance is in height
In warm environment will not change dramatically, electromagnetic acoustic exciting circuit and the power distribution for receiving circuit are unaffected, so be able to achieve
Excitation coil and receiving coil can continue to work normally under hot environment, lasting to generate and receive ultrasonic wave.Thus in high temperature
Under environment, the permanent magnet of the probe can continue to provide stronger bias magnetic field, and excitation coil and receiving coil can continue to produce
Raw and receive ultrasonic wave, that is, realizing the probe can be realized lasting detection to high temperature forge piece, the experiment proved that, the electricity
Magnetic ultrasonic probe may be implemented persistently to detect in 650 DEG C of high temperature forge piece.And existing electromagnetic ultrasonic probe design, forever
Magnet can only realize that bias magnetic field is stablized in the offer in the short time under high temperature environment, and excitation coil and receiving coil are in high temperature
Also ultrasonic wave can only be generated and received under environment in the short time, existing electromagnetic ultrasonic probe high-temperature resistance is poor, cannot achieve
Lasting detection is carried out under hot environment.
In addition, the current distribution is uneven of conductor is even when having alternating current or alternating electromagnetic field in conductor, electric current collection
In in " skin " part of conductor, that is to say, that current convergence is in the thin layer of conductor appearance, and closer to conductive surface, electric current is close
Degree is bigger, and conductor actually electric current is smaller.As a result increase the resistance of conductor, increase its loss power also.As general
A piece conducting wire being relatively large in diameter is changed to the form of multiply ceramics silver wire circle binding, it is ensured that electric current passes through multiply ceramics silver wire
The cross sectional current density of each small conducting wire of circle is close to uniform, to improve the wire sectional of multiply ceramics silver wire circle
Face utilization rate is further able to improve the conversion efficiency of electromagnetic ultrasonic probe.When electric current is in each of multiply ceramics silver wire circle
The cross section of small conducting wire is close to when being uniformly distributed, and at this time the impedance comparison of coil is stablized, when electromagnetic ultrasonic probe and high temperature are cast
When the lift off of forging changes, since lift off variation bring impedance variations are smaller relative to the impedance influences of coil,
So as to reduce the lift-off sensibility of electromagnetic ultrasonic probe.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of forge piece electromagnetic ultrasonic probe in embodiment of the present invention；
Fig. 2 is line A-A cross-sectional view in Fig. 1；
Fig. 3 is line B-B cross-sectional view in Fig. 1；
Fig. 4 is excitation coil and receiving coil configuration structure schematic diagram in embodiment of the present invention；
Fig. 5 is conductor structure schematic diagram in embodiment of the present invention；
Fig. 6 is that magnetic support is intended to the focusing effect diagram of magnetic circuit in embodiment of the present invention；
Fig. 7 is excitation coil electromagnetic ultrasonic probe shear-wave generation schematic diagram in embodiment of the present invention；
Fig. 8 is forge piece electromagnetic ultrasonic defect detection device structural schematic block diagram in embodiment of the present invention；
Fig. 9 is probe waveforms schematic diagram when detecting defective in embodiment of the present invention.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the common skill of this field
For art personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to this
The protection scope of invention.
Embodiment 1
The specific embodiment of the invention provides a kind of forge piece electromagnetic ultrasonic probe, as shown in Figures 1 to 6, including visits
Head shell 9, is set to the intracorporal permanent magnet 1 of chamber of probing shell 9, the excitation coil being set to below 9 outer bottom of probing shell
3 and receiving coil 4, the excitation coil 3 and receiving coil 4 are the parallel with 9 bottom of probing shell of conducting wire coiling
Helical coil structure, the silver wire 11 that the conducting wire uniformly smears ceramic coating 10 by 3~35 are bundled into cluster and form；It is described
High temperature resistant magnetic support 2 is provided with below permanent magnet 1, the central axes of the magnetic support 2 are vertical with the 3 place plane of excitation coil；Institute
It states 9 side wall of probing shell and bottom is provided with several pump mouths 6, preferably two pump mouths in the present embodiment, outside the probe
The top of shell 9 is provided with water outlet 7, and it is logical that the cavity between the probing shell 9 and the permanent magnet 1 constitutes water circulating cooling
Road 5.
For intaking, several pump mouths (6) connect the water pump that draws water and carry out water-drawing type water inlet (7) the connection water pipe
Water outlet.Using water-drawing type water-cycling mode, negative pressure can be formed, high temperature resistant electromagnetic ultrasonic probe can be reduced to hot environment
The requirement of middle sealing, avoid due to elevated-temperature seal it is poor caused by seepy question.Take the water of " under draw water upper water inlet "
Refrigerating mode, can make water flow sufficiently fluidly contact permanent magnet 1, enhance cooling effect, suitable for 650 DEG C of hot environments into
Row long-time, reliable defect non-destructive testing.Magnetic support 2 is centrally placed in bottom in probing shell, and is located at immediately below permanent magnet 1,
It can play the role of to 1 thermal insulation protection of permanent magnet.
Wherein, 11 line footpath of silver wire is 0.015mm~0.08mm, the ceramic coating 10 that 11 surface of silver wire is smeared
With a thickness of 0.03mm~0.07mm, the wire external layer is coated with the high-temperature plastic 12 of 0.05mm~0.1mm thickness.
Specifically, excitation coil 3 and receiving coil 4 the production method is as follows: 1) use the silver wire of 0.015mm~0.08mm
The ceramic coating 10 of 11 surface coating 0.03mm~0.07mm thickness；The line footpath of silver wire 11 can be 0.015mm, 0.08mm
Or any value in 0.015mm to the region 0.08mm, 10 thickness of ceramic coating can be 0.03mm, 0.07mm or 0.03mm extremely
Any value in the region 0.07mm；2) silver wire 11 that 3~35 have coated ceramic coating 10 is piled up into cluster, the line footpath of cluster
For 0.21mm~1.25mm, then the high-temperature plastic 12 in whole cluster wire external layer coating 0.05mm~0.1mm thickness；High-temperature plastic
12 thickness can be any value in 0.05mm, 0.1mm or 0.05mm to the region 0.1mm；3) the one of high-temperature plastic 12 will be coated with
Cluster high temperature resistant wire turns to spiral winding at a certain temperature, using mold；4) spiral winding after coiling is viscous with ceramics
Mixture 13 is fixed-type and is put into resistance furnace and carries out baking molding according to certain heating timing, when heating in the present embodiment
Sequence is 80 DEG C and heats 2 hours that 150 DEG C are heated 2 hours.Using this kind of manufacture craft production ceramic screw coil (including excitation
Coil 3 and receiving coil 4) outer diameter be 5mm~20mm, by experiment can in 650 DEG C of resistance furnaces 24 hours reliably workings.
The silver wire 11 that ceramic layer 10 is uniformly smeared as multiply is bundled into spiral winding made of cluster coiling with following excellent
Point: in the high temperature environment, ceramic insulation is reliable, is not easy electrical breakdown and forms noise；11 surface of silver wire is not easily formed oxide layer,
Spiral winding impedance in the high temperature environment will not change dramatically, electromagnetic acoustic exciting circuit and receive circuit power distribution not
It is impacted；The silver wire 11 that ceramic layer 10 is uniformly smeared as multiply encloses spiral winding made of coiling and is directly placed at high-temperature electromagnetic
The bottom of ultrasonic probe, on the one hand can reduce lift off, and another aspect ceramic layer is wear-resisting, good heat-insulation effect, be suitble to surface
Coarse high temperature forge piece.The permanent magnet 1 in high temperature resistant electromagnetic ultrasonic probe force using hydrologic cycle cooling system cold
But, and using high temperature resistant magnetic support 2 made of high magnetic permeability material of low conductivity, do not weakening biasing magnetic induction intensity seriously
Meanwhile increasing the distance of 1 distance high-temperature forge piece of permanent magnet as far as possible, it is ensured that permanent magnet still can in the high temperature environment
Stronger bias magnetic field is enough provided.Electromagnetic ultrasonic probe may be implemented in 650 DEG C of high temperature forge piece through experiment in above-mentioned design
Lasting detection.
In addition, the current distribution is uneven of conductor is even when having alternating current or alternating electromagnetic field in conductor, electric current collection
In in " skin " part of conductor, that is to say, that current convergence is in the thin layer of conductor appearance, and closer to conductive surface, electric current is close
Degree is bigger, and conductor actually electric current is smaller.As a result increase the resistance of conductor, increase its loss power also.As general
A piece conducting wire being relatively large in diameter is changed to the form of multiply ceramics silver wire circle binding, it is ensured that electric current passes through multiply ceramics silver wire
The cross sectional current density of each small conducting wire of circle is close to uniform, to improve the wire sectional of multiply ceramics silver wire circle
Face utilization rate is further able to improve the conversion efficiency of electromagnetic ultrasonic probe.When electric current is in each of multiply ceramics silver wire circle
The cross section of small conducting wire is close to when being uniformly distributed, and at this time the impedance comparison of coil is stablized, when electromagnetic ultrasonic probe and high temperature are cast
When the lift off of forging changes, since lift off variation bring impedance variations are smaller relative to the impedance influences of coil,
So as to reduce the lift-off sensibility of electromagnetic ultrasonic probe.
In the present embodiment, the receiving coil 4 is connected in series by multiple spiral winding head and the tail, and the receiving coil 4
Around the excitation coil 3 one weeks, the preferably described receiving coil 4 was connected in series multiple spiral windings by 6 spiral winding head and the tail.
Multiple spiral windings of receiving coil 4 can not only increase receiving coil around the excitation coil design in 3 one weeks
4 receive the area of ultrasonic wave, and can satisfy the impedance for reducing excitation coil 3 and increase wanting for the impedance of receiving coil 4
It asks, so that the exciting current of electromagnetic ultrasonic probe and effective receiving wire length of receiving coil 4 are improved, to improve electromagnetism
The conversion efficiency of ultrasonic probe, on the other hand, excitation coil 3 and receiving coil 4 are put using horizontal positioned form rather than vertically
It sets, excitation coil 3 can be reduced and be formed by interference of the electromagnetic crosstalk to receiving coil 4 in the excitation of amplitude radio-frequency current
It influences, avoids forming the pulse electromagnetic impact of big intensity in preamplifier input terminal, preamplifier is caused to be difficult quickly to return
It is multiple, detection blind area can be reduced, while the internal oscillator evanescent voltage signal of electromagnetic acoustic power amplifier can be reduced in receiving coil
The noise of middle formation, to improve signal-to-noise ratio.
Preferably, 2 bottom of magnetic support is indent spherical structure, which can provide the permanent magnet 1
Divergence expression bias magnetic field focusing make it perpendicular to the excitation coil 3.2 bottom of magnetic support be indent spherical structure can will originally
Divergence expression bias magnetic field focuses, it is made perpendicular to excitation coil and receiving coil, can to increase substantially shear wave purity as far as possible,
The interference of longitudinal wave and its mode converted wave to reception shear wave signal is avoided, while avoiding forming ultrasonic wave inside permanent magnet,
Shear wave purity and signal-to-noise ratio are improved, to improve the performance of electromagnetic ultrasonic probe.
In the present embodiment, the probing shell 9 includes main casing and the upper cover at the top of the main casing, the upper cover
Bottom is provided with the locating support 8 for fixing the permanent magnet 1.Permanent magnet is fixed by locating support, can avoid probe
When vibrating permanent magnet deviate or the cooled water impact of permanent magnet and deviate, it is ensured that stability when work.
In the present embodiment, the probing shell 9 is made of brass, and 9 bottom thickness of the probing shell be 0.2mm~
1mm.Different thickness is selected according to different ultrasonic frequencies, can eliminate in 9 bottom of probing shell generate ultrasonic wave can
Can, reduce interference.9 bottom thickness of probing shell requires the ultrasonic wavelength less than 0.5 times or the 1-2 for skin depth
Times, it can be to avoid formation ultrasonic resonator in the soleplate to interfere with normal ultrasonic signal.
When it is implemented, the permanent magnet 1 is the Nd-Fe-B permanent magnet or samarium cobalt permanent magnet body of cylindrical body, in the present embodiment,
The Nd-Fe-B permanent magnet of the preferred cylindrical body of the permanent magnet 1, the magnetic support 2 are permalloy, iron-nickel alloy, MnZn ferrite
A kind of middle material is made, the preferred MnZn ferrite magnetic support of the magnetic support 2.As shown in fig. 7, Nd-Fe-B permanent magnet or samarium cobalt permanent magnet
Body can provide quiescent biasing magnetic field, and bias magnetic field can be divided into the Bz component perpendicular to coil and be parallel to the Br component of coil, Bz/
Br ratio is bigger, and the shear wave that electromagnetic ultrasonic probe is excited is purer, i.e., shear wave is bigger relative to the ratio of longitudinal wave；MnZn iron oxygen
Body magnetic support has poly- magnetic, insulation, function resistant to high temperature.More specifically, in the present embodiment, magnet 1 is cylindrical body N52 neodymium iron boron
Permanent magnet, size can be diameter 60mm, height 50mm；MnZn ferrite magnetic support 2 high 5mm, upper bottom surface diameter 60mm, bottom
Face diameter 55mm, bottom surface indent sphere curvature radius 100mm, ball diameter of section 50mm.
Referring to Fig. 1 to Fig. 6, in the present embodiment, high-temperature electromagnetic ultrasonic probe is based primarily upon Lorentz force mechanismic design, still
For ferromagnetic metal material, there is also the effects of magnetostrictive force mechanism.The concatenated helix of excitation coil 3 and 6 head and the tail
The receiving coil 4 that circle is constituted is cast in 9 outer bottom of brass probing shell by ceramic binder 13.Excitation coil 3 is centrally arranged
In 9 outer bottom of brass probing shell, to excitation ultrasound wave.In order to improve reception signal amplitude, the Quick-return time is reduced,
Receiving coil 4 is constituted using 6 spiral windings and is arranged closely in conplane coil configuration mode around excitation coil 3, is used
To receive ultrasonic signal.2 bottom surface of MnZn ferrite magnetic support is indent dome shape, can focus script divergence expression bias magnetic field,
So that it is exactly perpendicularly to excitation coil coil and receiving coil, shear wave purity can be increased substantially, longitudinal wave and its mode is avoided to turn
Change interference of the wave to shear wave signal is received.Permanent magnet 1 is bonded in brass probing shell 9 with the absorption of MnZn ferrite magnetic support 2
It bottom and is welded between the shell of locating support 8, between brass probing shell 9 and permanent magnet 1 and MnZn ferrite magnetic support 2
Cavity be water circulating cooling channel 5, there are four aquaporins for the also processing of the lower section of MnZn ferrite magnetic support 2, can be sufficiently to MnZn iron
Oxysome magnetic support carries out water cooling.
Embodiment 2
As shown in figure 8, the specific embodiment of the invention, which provides a kind of high temperature forge piece, persistently detects electromagnetic supersonic flaw detecting
Device including above-mentioned probe and PC machine, exciting circuit and receives circuit；
The exciting circuit includes sequentially connected DA signal generator, power amplifier, motivates terminal impedance match circuit,
The both ends of the excitation coil 3 of the probe are connect with the excitation terminal impedance match circuit；
The reception circuit includes sequentially connected receiving-end impedance match circuit, preamplifier, filter and AD letter
Number capture card, the both ends of the receiving coil 4 of the probe are connect with the receiving-end impedance match circuit；
The DA signal generator, AD data acquisition card are connect with the PC machine.
High frequency sinusoidal pulse signal is generated after the digital signal of DA signal generator reception PC machine and passes through power amplifier
And impedance matching realizes that the input power of electromagnetic ultrasonic probe excitation coil maximizes, and transversal wave ultrasonic is excited, in test specimens
Surface is propagated from top to bottom, is detected, and ultrasonic signal is converted into after inverse Lorentz force effect or counter magnetostriction effect
Electric signal is received coil reception, after preamplifier amplification, filter filtering, is converted to by AD data acquisition card
Digital signal is shown in PC machine, obtains the time difference between beginning wave and flaw echo, and be calculated according to this defective locations and
Determine the equivalent diameter of defect.Device lift-off sensibility is low, conversion efficiency is high, signal-to-noise ratio is high for this.
Embodiment 3
The specific embodiment of the invention provides a kind of above-mentioned high temperature forge piece of utilization and persistently detects electromagnetic supersonic flaw detecting dress
The method of detection set, includes the following steps:
High frequency, high-power sinusoidal impulse string electric current, the high frequency, high-power sinusoidal impulse string electricity are passed through in excitation coil 3
Stream signal generates pulse eddy current in tested sample, generates Lorentz force or this kind of positive taut pulse under bias magnetic field effect
It rushes current signal and generates high-frequency alternating magnetic field signal in tested sample, tested sample surface is made to generate Lorentz force or mangneto
Dilatation causes tested sample surface vibration, to inspire transversal wave ultrasonic, passes from top to bottom in tested sample upper surface
It broadcasts, i.e., is propagated along tested sample thickness direction；
Flaw echo can be generated when transversal wave ultrasonic encounters internal flaw, and reaches the table of tested sample before the wave of bottom
Face, ultrasonic signal, which is converted into current signal after inverse Lorentz force effect or counter magnetostriction effect and is received coil 4, to be connect
It receives, after preamplifier amplification, filter filtering, digital signal is converted to by AD data acquisition card and is shown in PC machine
On, read the time difference t between beginning wave and flaw echo；
According to the distance d of formula d=1/2*v*t calculating defect to specimen surface, to complete the positioning analysis of defect, v
For spread speed of the ultrasound in tested sample material；Be modified according to the temperature of tested sample and in advance it is prefabricated flat
The test button in hole carries out flaw echoes comparison, determines the equivalent diameter of defect.
Wherein, high frequency, high-power sinusoidal impulse string electric current are 0.5MHz~5MHz, 10 periods~20 cycle sinusoidal pulses
String, electric current 10A~100A.
Referring to Fig. 1 to Fig. 9, pass through (0.5MHz~5MHz) sinusoidal impulse string (10 period~20 week in excitation coil 3
Phase) electric current (10A~100A), this high-frequency current generates pulse eddy current on tested sample surface, in the biasing magnetic of permanent magnet
Lorentz force is generated under field action, to motivate ultrasonic wave in specimen surface.And for ferromagnetic metal material, in addition to long-range navigation
Hereby outside power, there are also magnetostrictive forces, and be described as follows: high-frequency current goes out high frequency AC magnetic field in tested sample surface induction, the friendship
Varying magnetic field and the bias magnetic field that permanent magnet provides are superimposed, form the alternating magnetic field of synthesis, magnetize ferromagnetic metal material,
And the change in size elongated or shortened, to motivate ultrasonic wave.Ultrasonic wave is propagated in tested sample to lower surface,
It is reflected after encountering defect, back wave reaches tested sample upper surface and brings it about vibration.According to counter magnetostriction effect
Or inverse Lorentz force effect, sample upper surface vibration causes its surrounding magnetic field to change, to induce electricity in coil
Press signal.The ultrasound echo signal that coil receives can be input to after dual-stage amplifier by the acquisition of AD data acquisition card
In computer.Using LabVIEW Software Development Platform, noise reduction process, accurate measurement transmitting ultrasound are carried out to the signal after acquisition
Wave from tested sample upper surface travels to defect and the sum of from defect propagation to the upper surface time.Since tested sample is in certain temperature
The lower spread speed v of degree is that known (different metal material body sound velocity differences, same metal material is at different temperatures
Body sound velocity it is also different, need to measure in advance.), then in tested sample defect from upper surface distance d be d=1/2*v*t,
To complete the positioning analysis of defect.By lacking for the flat-bottom hole Defect Comparison sample of flaw echo amplitude and prefabricated different-diameter
The comparison of echo amplitude is fallen into, to realize the quantitative analysis of defect.
Detailed description of the present invention principle with reference to the accompanying drawing
The combining form of high-temperature electromagnetic ultrasonic probe is as shown in Figure 1.The production principle of electromagnetic acoustic is as shown in Figure 7.Ceramics
Excitation coil 3 is centrally placed in 9 outer bottom of brass probing shell, and the receiving coil 4 of 6 ceramic screw coils composition is around ceramics
Excitation coil 3 is arranged closely in same level, and cylindrical shape permanent magnet 1 is placed on MnZn ferrite magnetic support 2, and the two
It is centrally placed in bottom in brass probing shell 9 as a whole, for generating the stationary magnetic field Bz of vertical direction, MnZn iron
The bias magnetic field that oxysome magnetic support 2 generates permanent magnet is focused, and is played heat-insulated to permanent magnet and is avoided inside permanent magnet
Form ultrasonic wave, it is intended to improve shear wave purity and signal-to-noise ratio.When ceramic excitation coil 3 passes through high-frequency impulse exciting current Ie, meeting
Pulse eddy current Je is being generated by the surface of pyrometry forge piece 14, under the action of the Bz of stationary magnetic field, meeting exists pulse eddy current
Leftward or rightward Lorentz force FLr is generated by the surface of pyrometry forge piece 14, thus by 14 surface of pyrometry forge piece
Generate ultrasonic shear waves 15.In ferromagnetic metal material, other than Lorentz force, there are also magnetostrictive force or strains.High frequency
Pulse excitation electric current Ie induces high-frequency alternating magnetic field Bdr in by pyrometry forge piece 14, makes ferromagnetic metal material magnetic
Change, magnetostrictive force FMZr, and the change in size elongated or shortened is generated, thus by 14 surface of pyrometry forge piece
Periodic vibration is generated, ultrasonic wave is formed.Ultrasonic wave by 14 surface of pyrometry forge piece generate, and along thickness direction to
Lower propagation, after encountering defect, it may occur that reflection.According to inverse Lorentz force or counter magnetostriction effect, reflected ultrasound
Wave causes the variation of surrounding magnetic field by 14 surface vibration of pyrometry forge piece, generates voltage in ceramic receiving coil 4
Signal is input in computer after amplifying filtering several times by AD data acquisition card, and the letter in LabVIEW software is passed through
Number analysis and processing module obtains the time difference of beginning wave and flaw echoes.As shown in figure 9, since tested sample is in certain temperature
Under spread speed v be that known (different metal material body sound velocities are different, and same metal material is at different temperatures
Body sound velocity is also different, needs to measure in advance.), then it is d=1/ from upper surface distance d by defect in pyrometry forge piece 14
2*v*t, to complete the positioning analysis of defect.Flaw echo amplitude and the flat-bottom hole Defect Comparison of prefabricated different-diameter are tried
The flaw echo amplitude of sample compares, to realize the quantitative analysis of defect.
Excitation coil and receiving coil and multiple spiral windings head and the tail is made using multiply ceramic layer silver wire in this patent
Receiving coil in series and around two kinds of excitation coil one week designs, can inhibit the collection of excitation coil as much as possible
Skin effect, while meeting the impedance for reducing excitation coil and increasing the requirement of the impedance of receiving coil, it can reduce and mention as far as possible
It from sensibility, improves conversion efficiency and reduces detection blind area, and 650 DEG C of high temperature may be implemented and persistently detect.Existing patent is seldom
It is related to continuing the forge piece electromagnetic supersonic flaw detecting method and device thereof with low lift-off sensibility in relation to 650 DEG C of high temperature, and it is domestic and international
High-temperature electromagnetic ultrasonic probe mostly use water circulating cooling or cooling air mode that high temperature resistant either is set in coil lower end
Insulating materials, they only account for the local optimum to the design of probe coil or water-cooled effect, are not lauched from the condition of high temperature
Circulating cooling effect, the lift-off sensibility of coil, bias magnetic field congregational rate, coil receive amplitude and Quick-return time into
Row globality and System design, it is difficult to ensure that the flaw detection sensitivity of electromagnetic ultrasonic probe and detection under the high temperature conditions
Blind area.
This patent is comprehensively considered from water-cooled effect, takes the water refrigerating mode of " under draw water upper water inlet ", can
Sufficiently permanent magnet is fully cooled, while the high temperature resistant MnZn ferrite magnetic support placed below permanent magnet can further serve as
To the effect to permanent magnet thermal insulation protection；In addition indent dome shape is processed into magnetic support lower surface, script divergence expression can be biased
Magnetic field focuses, and so that it is exactly perpendicularly to coil, can increase substantially shear wave purity, avoids longitudinal wave and its mode wave to reception
The influence of shear wave signal.This patent is also from the point of view of improving reception signal amplitude, using unicoil excitation, multi-coil string
Join received configuration mode, receiving coil impedance can be increased, improves conversion efficiency；Meanwhile receiving coil is around excitation coil water
The mode that plain cloth is set can reduce the Quick-return time；It ensure that probe realizes that the duration is long, low lift-off is sensitive at high temperature
Property, conversion efficiency is high, signal-to-noise ratio is high, safe and reliable defect non-destructive testing.The present invention is based on water-drawing type water circulating cooling side
Formula, more eradication edge ceramic thread winding methods, unicoil excitation multi-coil receive configuration mode and MnZn ferrite magnetic support indent ball
Planar design method carries out duration length, low lift-off sensibility, conversion efficiency height, letter suitable for 650 DEG C of hot environments
It makes an uproar than high, safe and reliable defect non-destructive testing.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any
Modification, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of high temperature forge piece persistently detects electromagnetic ultrasonic probe, including probing shell (9), it is set to the probing shell
(9) the intracorporal permanent magnet of chamber (1), the excitation coil (3) and receiving coil being set to below the probing shell (9) outer bottom
(4), which is characterized in that the excitation coil (3) and receiving coil (4) be conducting wire coiling with the probing shell (9) bottom
The parallel helical coil structure in portion, the silver wire (11) that the conducting wire uniformly smears ceramic coating (10) by 3~35 are bundled into one
Cluster forms；It is provided with high temperature resistant magnetic support (2) below the permanent magnet (1), the central axes of the magnetic support (2) and the excitation coil
(3) plane where is vertical；Probing shell (9) side wall is provided with several pump mouths (6), the probing shell close to bottom
(9) it is provided at the top of water inlet (7), the sky between the probing shell (9) and the permanent magnet (1) and the magnetic support (2)
Chamber constitutes water circulating cooling channel (5).
2. high temperature forge piece according to claim 1 persistently detects electromagnetic ultrasonic probe, which is characterized in that the silver wire
(11) line footpath is 0.015mm~0.08mm, the ceramic coating (10) that silver wire (11) surface is smeared with a thickness of 0.03mm~
0.07mm, the wire external layer are coated with the high-temperature plastic (12) of 0.05mm~0.1mm thickness.
3. high temperature forge piece according to claim 1 or 2 persistently detects electromagnetic ultrasonic probe, which is characterized in that described to connect
Take-up circle (4) is connected in series by multiple spiral winding head and the tail, and multiple spiral windings of the receiving coil (4) are around the excitation
Coil (3) one weeks.
4. high temperature forge piece according to claim 1 persistently detects electromagnetic ultrasonic probe, which is characterized in that the magnetic support
(2) bottom is indent spherical structure, and the divergence expression bias magnetic field which can provide the permanent magnet (1) focuses
Make it perpendicular to the excitation coil (3).
5. high temperature forge piece according to claim 1 persistently detects electromagnetic ultrasonic probe, which is characterized in that the water inlet
(7) for intaking, several pump mouths (6) connect the water pump that draws water and carry out water-drawing type water outlet connection water pipe.
6. high temperature forge piece according to claim 1 persistently detects electromagnetic ultrasonic probe, which is characterized in that outside the probe
Shell (9) includes main casing and the upper cover at the top of the main casing, and the upper cover bottom is provided with for fixing the permanent magnetism
The locating support (8) of body (1).
7. high temperature forge piece according to claim 1 persistently detects electromagnetic ultrasonic probe, which is characterized in that outside the probe
Shell (9) is made of brass, and the probing shell (9) bottom thickness is 0.2mm~1mm.
8. high temperature forge piece according to claim 1 persistently detects electromagnetic ultrasonic probe, which is characterized in that the permanent magnet
It (1) is the Nd-Fe-B permanent magnet or samarium cobalt permanent magnet body of cylindrical body, the magnetic support (2) is permalloy, iron-nickel alloy, MnZn iron oxygen
One of body material is made.
9. a kind of high temperature forge piece persistently detects electromagnetic ultrasonic defect detection device, which is characterized in that any including claim 1~8
Probe and PC machine, exciting circuit and reception circuit described in；
The exciting circuit includes sequentially connected DA signal generator, power amplifier, motivates terminal impedance match circuit, described
The both ends of the excitation coil (3) of probe are connect with the excitation terminal impedance match circuit；
The reception circuit includes that sequentially connected receiving-end impedance match circuit, preamplifier, filter and AD signal are adopted
The both ends of truck, the receiving coil (4) of the probe are connect with the receiving-end impedance match circuit；
The DA signal generator, AD data acquisition card are connect with the PC machine.
10. a kind of method of detection for persistently detecting electromagnetic ultrasonic defect detection device using high temperature forge piece described in claim 9, special
Sign is, includes the following steps:
It is passed through high frequency, high-power sinusoidal impulse string electric current in excitation coil (3), so that transversal wave ultrasonic is inspired, along tested
Sample thickness direction is propagated；
Receiving coil (4) receives the electric signal that Ultrasonic transformation is and is converted to digital signal after amplifying, filtering and reaches PC
Machine reads the time difference t between beginning wave and flaw echo；
Defect is calculated to the distance d of specimen surface according to formula d=1/2*v*t, to complete the positioning analysis of defect, v is super
Spread speed of the sound in tested sample material；It is modified according to the temperature of tested sample and the gold with prior prefabricated flat-bottom hole
Belong to sample and carry out flaw echoes comparison, determines the equivalent diameter of defect.
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| CN114371221A (en) * | 2022-01-10 | 2022-04-19 | 哈尔滨工业大学 | Electromagnetic ultrasonic transducer with ultra-high temperature resistant double-coil structure |
| CN114371221B (en) * | 2022-01-10 | 2023-10-03 | 哈尔滨工业大学 | Electromagnetic ultrasonic transducer with ultra-high temperature resistant double-coil structure |
| CN114517280A (en) * | 2022-02-07 | 2022-05-20 | 中国特种设备检测研究院 | Preparation method of magnetostrictive coating and magnetostrictive guided wave sensor |
| CN115647684A (en) * | 2022-12-26 | 2023-01-31 | 北京坤飞航天科技有限公司 | Rapid nondestructive detection method and device for surfacing defects |
| CN116592989A (en) * | 2023-07-17 | 2023-08-15 | 中国特种设备检测研究院 | Vector electromagnetic ultrasonic sensor |
| CN116592989B (en) * | 2023-07-17 | 2023-10-13 | 中国特种设备检测研究院 | Vector electromagnetic ultrasonic sensor |
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