WO1999023486A1 - Procede et appareil de detection par ultrasons des defauts sur la surface d'un cylindre circulaire, et procede de meulage d'un cylindre utilisant cet appareil - Google Patents
Procede et appareil de detection par ultrasons des defauts sur la surface d'un cylindre circulaire, et procede de meulage d'un cylindre utilisant cet appareil Download PDFInfo
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- WO1999023486A1 WO1999023486A1 PCT/JP1998/004897 JP9804897W WO9923486A1 WO 1999023486 A1 WO1999023486 A1 WO 1999023486A1 JP 9804897 W JP9804897 W JP 9804897W WO 9923486 A1 WO9923486 A1 WO 9923486A1
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- roll
- surface wave
- ultrasonic
- cylindrical body
- wave
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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
-
- 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
- G01N29/2487—Directing probes, e.g. angle probes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B27/00—Other grinding machines or devices
- B24B27/033—Other grinding machines or devices for grinding a surface for cleaning purposes, e.g. for descaling or for grinding off flaws in the surface
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
- B24B49/10—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation involving electrical means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
- B24B49/12—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation involving optical means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
- B24B5/36—Single-purpose machines or devices
- B24B5/363—Single-purpose machines or devices for grinding surfaces of revolution in situ
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
- B24B5/36—Single-purpose machines or devices
- B24B5/37—Single-purpose machines or devices for grinding rolls, e.g. barrel-shaped rolls
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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
- G01N29/041—Analysing solids on the surface of the material, e.g. using Lamb, Rayleigh or shear waves
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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
- G01N29/228—Details, e.g. general constructional or apparatus details related to high temperature conditions
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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
- G01N29/2437—Piezoelectric probes
- G01N29/245—Ceramic probes, e.g. lead zirconate titanate [PZT] probes
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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
- G01N29/26—Arrangements for orientation or scanning by relative movement of the head and the sensor
-
- 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
- G01N29/28—Details, e.g. general constructional or apparatus details providing acoustic coupling, e.g. water
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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
- G01N29/36—Detecting the response signal, e.g. electronic circuits specially adapted therefor
- G01N29/40—Detecting the response signal, e.g. electronic circuits specially adapted therefor by amplitude filtering, e.g. by applying a threshold or by gain control
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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
- G01N29/36—Detecting the response signal, e.g. electronic circuits specially adapted therefor
- G01N29/42—Detecting the response signal, e.g. electronic circuits specially adapted therefor by frequency filtering or by tuning to resonant frequency
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/04—Wave modes and trajectories
- G01N2291/042—Wave modes
- G01N2291/0421—Longitudinal waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/04—Wave modes and trajectories
- G01N2291/042—Wave modes
- G01N2291/0423—Surface waves, e.g. Rayleigh waves, Love waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/04—Wave modes and trajectories
- G01N2291/057—Angular incidence, parallel to surface propagation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/26—Scanned objects
- G01N2291/263—Surfaces
- G01N2291/2634—Surfaces cylindrical from outside
Definitions
- the present invention exists on the surface of a metal cylindrical body such as a rolling roll or a roller, and particularly on the surface or immediately below the surface of a rolling high-speed roll made of high-speed tool steel whose surface has been thermally and mechanically damaged by rolling.
- the present invention relates to a method for ultrasonically inspecting a cylindrical surface, which is suitable for detecting a defect such as a crack by a surface wave, a device for collecting the ultrasonic wave, and a method for grinding a roll using the same.
- Rolling rolls used for hot rolling of metal sheets are thermally and mechanically damaged on the surface by rolling.
- the thermal and mechanical damage on the surface of the pre-work roll made of high-speed tool steel used for hot finish rolling (hereinafter referred to as the high-speed roll for finishing pre-stand) will be described in detail below with reference to Fig. 20. .
- the thermal damage is caused by the high temperature of the material to be rolled at the front stage of the finishing stand, and a deep primary crack K called a heat crack is generated perpendicular to the surface of the roll 100.
- the mechanical damage is due to the shear stress caused by rolling with the back-up roll, and a secondary crack L is generated near the parallel to the mouth surface, starting from the heat crack K.
- a minute chip M is generated on the roll surface.
- this minute chipping M is transferred to the material to be rolled, it becomes a surface defect of the material to be rolled. Therefore, after being removed from the surface to a certain depth (hereinafter, referred to as a certain amount), for example, after being removed by grinding with a grindstone, The roll is used for rolling again, but after grinding, as shown in JP-A-Hei-27-65747, ultrasonic inspection using surface waves (referred to as surface wave inspection) Is performed.
- a surface wave probe probe
- a couplant such as water
- the couplant film in the portion of the roll surface where the surface wave propagates is removed to detect defects existing on the roll surface or directly below the surface. If a defect is detected by this surface wave inspection, additional grinding is performed.
- This ultrasonic flaw detector includes a rotating means for rotating a cylindrical or columnar material to be inspected for surface defects or the like in a circumferential direction thereof, and an ultrasonic probe for detecting defects or the like by ultrasonic waves.
- Water supply means is provided between the sample and the test material.
- the holding portion has a copying portion that protrudes downward from the probe and that smoothly abuts the surface of the test material.
- the copying portion is configured to contact the rotating test material by the holding portion.
- the water supply means is provided near the contact of the holding portion.
- This water supply means has a storage portion in which the medium liquid that has been led to the vicinity of the probe from another source can be temporarily stored.
- This housing part is located near the probe, has a plurality of water outlets at the bottom, and has an air vent hole penetrating to the outside at the top.
- Each of the plurality of water outlets is arranged so as to intersect the circumferential direction in front of the traveling direction when the probe scans the surface of the test material due to the rotation of the test material, From the front of the probe during scanning, medium water in the storage section is discharged between the probe and the surface of the test material.
- the depth of thermal and mechanical damage generated by rolling depends on the length of the rolled metal sheet, rolling speed, cooling conditions of rolls, and material (even if rolls are classified as the same material, There is a slight difference in the material due to the difference in the method). Therefore, if this is removed by a certain amount of grinding, the following problems will occur.
- a conventional surface acoustic wave probe is composed of an ultrasonic transducer and a wedge for making ultrasonic waves incident on the roll surface at an angle of 0i.
- the incident angle of 0i is expressed by the following equation (1) using the law of refraction. It is set to be satisfactory.
- ⁇ i sin (CW / CRs) (1)
- CRs Surface wave velocity on common steel.
- the angle of incidence ⁇ is the angle to the vertical plane perpendicular to the roll surface.
- the present inventors paid attention to the difference in the material caused by the difference in the method of manufacturing the high-speed roll and examined how the difference in the material affected the surface flaw detection described above.
- the surface wave velocity in high speed roll is the surface wave velocity of general steel.
- the transmission and reception of the surface wave to the roll surface by the surface wave probe is performed by setting the incident angle i so that the refraction angle is 90 degrees by using the refraction phenomenon expressed by the above equation (1). . Therefore, when the speed of the surface wave differs depending on the roll material as shown in Table 1, it is necessary to change the incident angle according to the speed of each surface wave. Otherwise, the efficiency of transmitting and receiving surface waves will decrease.
- a surface wave probe is manufactured by determining the angle of incidence Si based on the surface wave velocity of 2980m / sec for general steel.
- Table 1 the surface wave velocity at each high-speed roll is significantly different from the surface wave velocity at general steel, and the material difference between each high-speed roll due to the method of manufacturing the high-speed roll. Therefore, the surface wave velocity varies, but the difference is not actually considered in the design of the incident angle 0 i. Therefore, the angle of incidence i is significantly different from the appropriate value for transmitting and receiving the optimal surface wave.
- high-speed roll testing is performed on or near a roll grinding facility.
- Such mechanical equipment often generates large electrical noises from the night and in the evening, and large electrical noises are often superimposed on flaw detection signals using surface waves.
- the height of the reflected wave of the defect decreases because the transmission / reception efficiency of the surface wave has already been reduced as described above, so that the ratio of the amplitude of the defect reflected wave to the electrical noise is reduced. That is, the S / N ratio decreases, and the defect detection ability decreases.
- the value of the surface wave velocity is, for example, as shown in Table 1. Assuming that the surface wave velocity at either high or low, which is the minimum or maximum value such as 3090 m / sec or 3180 m / sec, the material whose surface wave velocity has the opposite maximum or minimum value In high-speed rolling, the transmission / reception efficiency of surface waves is reduced and the defect detection capability is reduced, and the problem cannot be solved.
- the present invention has been made to solve the above-mentioned conventional problems, and when performing ultrasonic flaw detection using a surface wave, it is possible to prevent over-detection of primary cracks and to reduce the level of noise from crystal grain boundaries. It is a first object of the present invention to provide a method and an apparatus for ultrasonically wounding a cylindrical body which can reduce the defect and improve the defect detection ability.
- Another object of the present invention is to provide an ultrasonic testing device which can maintain the medium flow rate and prevent excess medium liquid from flowing out to the front of the probe.
- the present invention also improves the roll unit efficiency by optimizing the amount of roll grinding when rolling a roll whose surface has been thermally or mechanically damaged by rolling or the like, and also improves the efficiency of roll grinding.
- a third object is to provide a method of grinding a roll that can be performed.
- the present invention provides a high-speed ultrasonic inspection method for high-speed rolls using surface waves, which enables high-efficiency transmission and reception of surface waves even if there is a difference in roll material due to a difference in the manufacturing method.
- a fourth object is to provide a roll inspection surface wave probe capable of increasing the ZN ratio and a method of setting the incident angle thereof. Disclosure of the invention
- a surface wave probe is brought into contact with the surface of a rotating cylindrical body via a medium liquid, a surface wave is propagated from the surface wave probe to the cylindrical body, and the surface wave probe exists on the surface of the cylindrical body or immediately below the surface.
- the center frequency of the surface wave transmitted and received by the surface wave probe is fc, and the frequency of the surface wave
- the first object of the present invention has been achieved by setting a frequency bandwidth in a spectrum whose intensity falls within a range of 16 dB or less with respect to a peak value to 0.50 ic or more.
- the present invention also provides the ultrasonic flaw detection method, wherein the pulse width of the surface wave pulse transmitted and received by the surface acoustic wave probe is set to 2.5 times or less the wavelength of the surface acoustic wave propagating through the cylindrical body. This solves the first problem.
- a surface wave probe is brought into contact with the surface of a rotating cylindrical body via a medium liquid, a surface wave is propagated from the surface wave probe to the cylindrical body, and the surface wave probe exists on the surface of the cylindrical body or immediately below the surface.
- a surface wave probe for transmitting and receiving the surface wave is arranged on an ultrasonic transmitting and receiving surface of the ultrasonic transducer. The first problem is likewise solved by providing the wedge provided and the damping material provided on the back surface thereof.
- the present invention provides a method for manufacturing the ultrasonic transducer according to the present invention, comprising: a lead niobate-based porcelain; a lead titanate-based porcelain; A vibrator in which a number of PZTs are arranged side by side), a 0-3 type composite vibrator (a vibrator in which ceramic vibrators are uniformly dispersed in a polymer material), or This is a 1-type composite vibrator (a vibrator made by forming many through-holes in a lead zirconate titanate (PZT) plate and pouring epoxy resin or the like into it and hardening it).
- the wedge is made of polyimide resin, polystyrene resin, acrylic resin, or fluororesin (Teflon).
- the surface wave probe 10 mainly includes an ultrasonic vibrator 1 OA, a damping material 10 B, and a resin wedge 10 C to transmit and receive surface waves.
- the center frequency of the surface wave probe is fc
- the frequency bandwidth of the surface acoustic wave probe 10 is 0.50 fc or more.
- the peak value of the spectrum intensity (signal intensity) is -6.
- Frequency width within the range of dB: fR-fL is defined as the frequency bandwidth, and the following equation (2) is satisfied.
- the frequency band of the surface acoustic wave probe 10 is set to a wide band of 0.50 fc or more.
- the specific configuration of the surface acoustic wave probe 10 will be described.
- the ultrasonic vibrator 1OA includes a lead niobate-based porcelain or a vibrator having a low mechanical Q value such as a composite vibrator shown in FIGS.
- a vibrator that is easily mechanically damped even if the mechanical Q value is high, such as lead titanate porcelain can be used.
- the mechanical Q value is a quantity indicating the sharpness of the resonance vibration, and the longer the mechanical Q value, the longer the duration of the vibration.
- the center frequency fc of the transmitted and received surface waves needs to be set in an appropriate range because scattering noise varies depending on the crystal grain boundaries and surface roughness of the material to be detected. For example, in the case of a roll for rolling, 1 to 4 MHz is preferable.
- the ultrasonic wave whose frequency bandwidth is 0.5 fc or more and whose pulse width is 2.5 times or less the wavelength of the surface wave Pulses can be generated (transmitted).
- the resin wedge 10C contacts the surface of the subject via the medium so that the ultrasonic vibration satisfies the following expression (3) as shown in FIG.
- the ultrasonic transmission / reception surface has a slope that intersects with the normal S1 of the ultrasonic transmission / reception surface at the angle of incidence with respect to the normal S1 of the bottom of the ultrasonic transducer 1OA. Side) is attached.
- the wedge 10C itself is formed using a polystyrene resin, a polyimide resin, or the like, having as small an attenuation factor as possible so as not to impair the short pulse waveform as described above.
- FIG. 4 shows an area where the micro-reflector is located using an ultrasonic pulse whose frequency bandwidth is 0.70 fc or more and whose pulse width is as short as 1.5 times the wavelength of the surface wave.
- FIG. 22 shows the observed waveform at this time, which corresponds to FIG. 22 of the conventional example. As shown in FIG. 4, it can be seen that the increase in amplitude is small even if the reflected waves of small amplitude from the remaining portion of the primary crack K overlap at the same phase because the pulse width is short.
- the surface acoustic wave probe 10 of the present invention which is capable of transmitting and receiving a surface wave pulse having a short pulse width, is applied to the detection of a defect of a roll in which the residual portion of the primary crack K exists innumerably, It is possible to effectively prevent an increase in the amplitude of the reflected wave from the object.
- Figure 5 shows the height of the reflected wave from the primary crack K of the first stage work roll for hot finish rolling using a surface wave probe with a center frequency of 2 MHz, which has a different frequency bandwidth (different pulse width).
- This figure shows the results of an investigation of the relationship between the laser beam width and the wavelength of the surface wave.
- the height of the reflected wave from the vertical drill hole of lmm diameter and lmm depth was used as the standard of the reflected wave height, and the depth of the primary crack K was about 0.15 mm.
- measured points Al, A2, and A3 correspond to the present invention, and use lead niobate ceramics as the ultrasonic transducer 1OA constituting the surface acoustic wave probe 10, and further, as the damping material 10B.
- a damping material is used in which the volume fraction of tungsten powder mixed with the epoxy resin is 80%, 60%, and 40%, respectively.
- Bl and B2 correspond to the comparative examples.
- PZT was used as the ultrasonic transducer 1 OA, and the damping material used as the damping material 10B was such that the volume fraction of tungsten powder mixed with the epoxy resin was 80% and 60%, respectively. Is used.
- Cl and C2 correspond to the conventional example, in which PZT whose mechanical Q values are slightly different from each other is used as the ultrasonic oscillator 1OA, and the damping material 10B is not used. Except for the above, they were measured with substantially the same equipment. From FIG. 5, it can be seen that the shorter the pulse width, the lower the height of the reflected wave from the primary crack K.
- the suitable materials for the ultrasonic vibrator 10A and the resin wedge 10C were examined in detail.
- the damping material 10 B an epoxy resin mixed with tungsten powder and solidified is used, and the volume fraction of the tungsten powder mixed with the epoxy resin is 80%, 60%, and 40%, respectively. , 20%.
- the ultrasonic vibrator 10 A lead niobate porcelain, lead titanate porcelain, lead zirconate titanate (PZT), barium titanate, lithium niobate, 1-3 type composite vibrator (Fig. 23) , 0-3 type composite vibrator (Fig. 25) and 3-1 type composite vibrator (Fig.
- polyimide resin polystyrene resin, acrylic resin, fluorine resin (Teflon), manufacture a surface acoustic wave probe, measure the frequency bandwidth and pulse width of the transmitted and received surface acoustic waves, and use the same pre-work roll for hot finish rolling as in the experiment shown in Fig. 5.
- the reflected wave height from the primary crack was investigated. The height of the reflected wave is based on the height of the reflected wave from a vertical drill hole with a diameter of l mm and a depth of lmm, which is exactly the same as the experiment shown in Fig. 5.
- the height of the reflected wave from the primary crack K was higher than 11 ld B.
- Tables 2 to 4 show that in all cases, the ultrasonic transducer 10A has niobium. It can be seen that lead oxide porcelain, lead titanate porcelain, 1-3 type composite vibrators, 0-3 type vibrators, and 3-1 type vibrators can all be used.
- resin wedge 10 B includes polyimide resin (ultrasonic attenuation constant at 2 MHz: 1.2 X 10 2 dB / m) and polystyrene resin (ultrasonic attenuation constant at 2 MHz: 1.3 X l (r 2 dB / m), Acrylic resin (ultrasonic attenuation at 2 MHz: 1.8 X 10-2 dB / m), Fluoro resin (Teflon: Ultrasonic attenuation at 2 MHz) :.
- the present inventors conducted ultrasonic flaw detection of the former work roll for hot finish rolling under substantially the same conditions using a conventionally used surface wave probe having a pulse width of 5 times the wavelength of the surface wave.
- the reflected wave from the primary crack is reduced by 3 dB.
- the height of the reflected wave from the next crack was 3 d
- the number of roll grinding passes can be reduced at least once.
- the determination as to whether or not to make the final roll grinding pass is made based on whether or not the actually measured value measured after the grinding is equal to or less than a predetermined threshold.
- the height of the reflected wave from the primary crack is 3 d compared to the value C 1 measured by a surface wave probe whose pulse width is 5 times the wavelength of the surface wave conventionally used.
- the pulse width of the surface wave probe that can obtain a measured value that can be reduced by B or more is 2.5 times or less the wavelength of the surface wave
- the difference between the measured values A3 and C1 is 3 dB.
- the number of roll grinding passes can be reduced by one or more times.
- the bandwidth of the surface wave probe capable of transmitting and receiving a surface wave whose pulse width is 2.5 times or less the wavelength of the surface wave is more than 50%.
- setting the frequency bandwidth of the surface acoustic wave probe to 0.50 fc or more has the effect of reducing overgrinding of the mouth due to overdetection of the primary crack. This is the basis for setting the frequency bandwidth of the surface acoustic wave probe to 0.50 fc or more in the present invention.
- the pulse width conventionally used is reduced. Compare the case of using a surface wave probe of about 5 times the wavelength of the surface wave (point C1 in Fig. 5) with the case of the present invention (points A1 to A3), and set the height of the reflected wave from the primary crack K to 3 to 6 dB or more could be reduced.
- a surface wave probe whose pulse width was 1.5 times the wavelength of the surface wave had an SZN ratio of the reflected wave from the crack of 10 dB and a pulse width of 2.5 times the surface.
- the SZN ratio of the reflected wave from the crack was 7 dB in the wave probe, while the SZN ratio of the conventionally used surface wave probe whose pulse width was about 5 times the wavelength of the surface wave was about 5 dB. 4 dB. Therefore, according to the method of the present invention, the SZN ratio can be increased by about 3 to 6 dB as compared with the conventional method, and the defect detection ability can be greatly improved.
- the ultrasonic vibrator 10A, the damping material 10B, and the resin wedge 10C shown in Fig. 1 were mixed with lead niobate-based porcelain and epoxy resin at a volume fraction of 60%, respectively.
- Investigation of the actual amount of grinding before dropping to below the bell level revealed that using an ultrasonic flaw detector with a surface wave probe with a pulse width of about 5 times the wavelength of the surface wave with the actual amount of grinding in terms of diameter, In the same manner, the conventional example was 0.33 mm, but was reduced to 0.2 mm by the present invention.
- the present invention it is possible to reduce the amount of grinding by 0.1 mm or more as compared with the conventional technology. Even with such a reduction, the degree of surface defects of the material to be rolled due to minute chips generated on the surface of the rolling roll was almost the same as before.
- a surface wave probe is brought into contact with the surface of a rotating cylindrical body via a medium liquid, and the surface wave is propagated from the surface wave probe to the cylindrical body.
- a column rotating means for rotating the column in a circumferential direction thereof; Rotation speed detection means for detecting the rotation speed of the cylinder by the rotation means; holding means for holding the surface acoustic wave probe at a constant distance above the cylinder body with respect to the surface of the cylinder body;
- a scanning means for scanning in the axial direction, and a medium liquid serving as an ultrasonic transmission medium can be supplied between the surface acoustic wave probe and the surface of the cylindrical body, and a cylinder formed by the cylindrical rotating means.
- Body rotation A water supply means provided with a flow control valve capable of controlling the supply amount of the medium liquid according to the speed; and when the center frequency of the surface wave transmitted and received by the surface wave probe is fc, the frequency of the surface wave In the spectrum, the ultrasonic wave is arranged on the ultrasonic transmitting and receiving surface of the ultrasonic vibrator so that the frequency bandwidth corresponding to the width within 6 dB from the peak value is 0.50 fc or more.
- a surface wave probe having a wedge and a damping material disposed on the back surface of the ultrasonic transducer and capable of detecting a defect by a surface wave; and transmitting the surface wave to the surface wave probe.
- the supersonic to amplify the signal captured by the surface wave probe to the level required for defect determination and output A wave transmitter / receiver, a gate unit for extracting and outputting a signal to be subjected to defect determination from a signal output from the ultrasonic transmitter / receiver, and detecting and outputting an amplitude of a signal output by the gate unit, or
- the third problem has been solved by comparing the level of the signal with a predetermined threshold value and, when the level of the signal is high, including defect determination means for outputting a signal indicating that there is a defect.
- the wedge intersects the bottom surface brought into contact with the surface of the cylindrical body via the couplant, and the normal line intersects with the normal line of the bottom surface portion at an incident angle 0i defined by the above-mentioned formula (3).
- the surface wave can be efficiently propagated on the surface of the cylindrical body.
- the inventors use a high-speed roll having an artificial defect, change the rotation speed of the high-speed roll, and stably transmit ultrasonic waves from the probe to the roll surface.
- the figure shows the results of examining the amount of medium liquid (water in this experiment) that is suitable for maintaining the height of the reflected wave from the artificial defect at a constant value without flowing out in front of the probe. See Figure 6. If the amount of water is within the shaded area, the transmission of ultrasonic waves from the probe to the roll surface will be stable. It has been found that as the rotation speed of the high-speed roll increases, the amount of medium liquid also needs to be increased.
- the rotation speed of the high-speed roll is measured by the rotation speed detection means, and the supply amount of the medium liquid is controlled by using the flow rate control valve provided in the water supply means according to the rotation speed of the high-speed roll.
- An amount of medium liquid can be supplied between the probe and the high-speed roll surface, so that the transmission of ultrasonic waves from the probe to the roll surface can be maintained stably, and the excess medium liquid can be supplied.
- the probe can be prevented from flowing forward.
- the present invention also relates to a method of grinding a roll having a thermally or mechanically damaged surface, before starting the grinding, or during the grinding, while rotating the roll to form a couplant film on the surface of the roll.
- the surface wave probe is contacted via the surface wave probe, and the surface wave is propagated from the surface wave probe. In this way, the height of the reflected wave from the thermally or mechanically damaged portion existing or remaining on the surface of the roll is measured, and the subsequent grinding amount is set according to the reflected wave height to perform the grinding.
- the third problem has been solved.
- the surface of the rotating roll is in contact with the medium via a medium, and is composed of at least an ultrasonic vibrator and a wedge that makes the ultrasonic wave incident on the roll surface at an incident angle of 0 i.
- the incident angle is set so as to satisfy the following expression (4).
- ⁇ i sin " 1 (CW / CRav)... (4)
- CW is the ultrasonic velocity in the wedge
- CRav is the average value of the surface wave velocity of each roll to be inspected.
- the angle of incidence 0 i is the angle to the vertical plane perpendicular to the roll surface.
- the medium is made up of a wedge that comes into contact with the surface of the rotating roll via a medium, and at least an ultrasonic vibrator and ultrasonic waves are incident on the roll surface at an incident angle »i, and are arranged to propagate the surface wave.
- the incident angle 0i is set so that the above equation (4) is satisfied. This has solved the above problem.
- the inventors use the surface acoustic wave probe to measure the reflected wave height from the thermally / mechanically damaged portion and the remaining amount of the thermally / mechanically damaged portion (when the reflected wave height falls below the defect detection threshold value).
- the height of the reflected wave from the thermally and mechanically damaged part is measured while grinding the rolling rolls thermally and mechanically damaged by rolling in minute amounts. It was investigated by doing. The result is shown in FIG. It is often found that the height of the reflected wave from the thermal and mechanical damage decreases as the remaining amount of the thermal and mechanical damage decreases.
- Figure 8 shows the relationship between the amount of grinding required to remove the thermally and mechanically damaged parts and the height of the reflected wave from the thermally and mechanically damaged parts, as shown in Figure 8.
- the height of the reflected wave from the thermally or mechanically damaged part was measured by ultrasonic inspection using surface waves, and the grinding amount was determined using the relationship in Fig. 8.
- the surface wave probe and the grinding wheel are moved to the place where the reflected wave height from the thermally and mechanically damaged portion is the highest, and plunge (phmge) grinding is performed while performing flaw detection, resulting in thermal and mechanical damage.
- Optimum grinding can be performed by determining the grinding amount at which the reflected wave height from the part becomes less than a predetermined level and grinding the remaining roll surface according to this grinding amount.
- the place where the reflected wave height from the thermally and mechanically damaged part is the highest is obtained. It can be identified as the place with the highest remaining thermal and mechanical damage. Therefore, as shown in FIG. 9, the position where the grinding wheel 62 of the roll grinding device and the surface wave probe 10 are brought into contact with the rolling roll 110 (the position in the axial direction of the roll) is matched, and then the thermal grinding is performed. ⁇ The surface wave probe 10 is brought into contact with the grindstone 62 of the portal grinding device at the point where the reflected wave height from the mechanically damaged part is the highest.
- the grinding may be performed by setting the grinding amount of the remaining roll surface to the grinding amount.
- FIG. 1 Cross-sectional view showing an enlarged schematic configuration of the surface acoustic wave probe used in the present invention.
- Figure 2 Diagram for explaining the frequency bandwidth of the surface acoustic wave probe
- Figure 3 Diagram showing the relationship between the frequency bandwidth of the surface acoustic wave probe and (pulse width / wavelength of surface acoustic wave)
- Fig. 4 Explanatory diagram showing the relationship between the waveform observed by the present invention and the reflected wave from the micro-reflector.
- Fig. 5 Diagram showing the relationship between the height of the reflected wave from the next crack and (pulse width Z wavelength of surface wave).
- Fig. 6 Diagram showing the relationship between the rotation speed of the rolls and the preferred amount of medium for explaining the principle of the present invention.
- Fig. 7 Similarly, a diagram showing the relationship between the reflected wave height from the thermally and mechanically damaged part and the remaining amount of the thermally and mechanically damaged part.
- Figure 8 Similarly, a diagram showing the relationship between the required grinding amount and the reflected wave height from the thermally and mechanically damaged part
- Fig. 9 Similarly, a perspective view showing the positional relationship between the grindstone and the surface wave probe in plunge grinding.
- FIG. 10 is a side view showing a schematic configuration of a first embodiment of the ultrasonic flaw detector according to the present invention.
- FIG. 11 is an enlarged front view showing a probe holder portion of the first embodiment.
- FIG. 12 Similarly, a side view showing a main part of the surface acoustic wave probe with a water supply section cut away.
- FIG. 13 Side view showing a schematic configuration of a second embodiment of the ultrasonic flaw detector according to the present invention. Diagram showing the relationship between the height of the reflected wave from the defect and the rotation speed when flaw detection was performed by changing the roll rotation speed in the second embodiment.
- FIG. 15 is a side view showing a schematic configuration of a third embodiment of the ultrasonic inspection equipment according to the present invention.
- FIG. 16 is a side view showing a schematic configuration of the fourth embodiment as well.
- FIG. 17 is a graph showing the results of measuring the reflected wave height of artificial defects processed into five types of rolls using the probe F of the present invention and the probes G and H of the conventional method.
- Fig. 18 Rolls of 5 kinds of granules using the probe F of the present invention and the probes G and H of the conventional method 7 is a graph showing a result of measuring an SZN ratio of a reflected wave of an artificial defect processed into a shape.
- FIG. 19 is a graph showing, as SZN ratios, the results of flaw detection inspection of 20 surface defects using the probe F of the present invention and the probes G and H of the conventional method.
- Fig. 20 Conceptual diagram for explaining cracks generated on the circumferential surface of a work roll for hot finish rolling
- Fig. 21 Explanatory diagram showing the positional relationship between the surface acoustic wave probe and the micro-reflector
- Fig. 22 Explanatory diagram showing the relationship between the observation waveform obtained by the conventional method and the reflected wave from the minute reflector.
- Fig. 23 An example of the probe oscillator of the present invention (1-3 type composite oscillator).
- Fig. 24 Probe oscillator of the present invention.
- Fig. 25 Example of probe vibrator of the present invention (0-3 type composite vibrator)
- FIG. 10 is a schematic side view showing a first embodiment of the ultrasonic flaw detector according to the present invention.
- the ultrasonic flaw detector of the present embodiment has a rolling roll indicated by reference numeral 110 in the drawing as a subject, and has a roll rotating device for rotating the roll 110 as a basic configuration, and a roll 110 Surface wave probe 10 for transmitting and receiving surface waves, probe holder 12 for holding the probe 10, and a roll of contact medium (water) provided on the holder 12.
- a water supply means (described later) for supplying water between the surface of the surface 10 and the surface acoustic wave probe 10 is provided.
- the roll rotating device is not shown in the figure to avoid complicating the drawing. However, if it is possible to rotate the roll 110 to be inspected in the circumferential direction C, a well-known suitable device may be used. Device can be used.
- the surface wave probe 10 has a frequency bandwidth of 0.5 fc or more and a pulse width of The type of transducer and the composition of the damping material were adjusted so that surface waves with a wavelength 2.5 times or less the wavelength of the surface wave could be transmitted and received.
- the surface wave probe 10 forms a state in which the gap between the probe 10 and the surface of the rolling roll 110, which is the subject, is filled with water (medium liquid).
- water medium liquid
- the probe holder 12 holding the surface acoustic wave probe 10 is provided with a guide 16 which can be slid in the vertical direction with respect to a fixed structure portion 14 located above the rolling roll 110. It is held by a holding mechanism 18 attached to the lower part.
- the holding mechanism section 18 is provided with a total of four rollers 20, a pair of front and rear rollers, and the probe holder 12 is disposed between the rollers 20.
- the four rollers 20 abut on the surface of the rolling roll 110 and rotate to stabilize flaw detection scanning.
- the fixed structure portion 14 includes a motor 14A for supplying a driving force for moving the holding mechanism portion 18 up and down along the guide 16 via a well-known transmission means (not shown).
- a mounting base 14 B is provided.
- the fixed structure 14 can be scanned in the axial direction of the rolling roll 110 by scanning means (not shown), whereby the surface wave probe 10 can be scanned in the axial direction of the rolling roll 110. It is.
- the probe holder 12 is attached to a lower end of a rod 12A loosely fitted to the holding mechanism 18 so as to be movable up and down, and is disposed at a predetermined position around the rod 12A. It is always supported by a spring (not shown) mounted on the lower side in the figure, that is, while being pressed against the surface of the rolling roll 110 with an appropriate force.
- the probe holder 12 includes the surface wave probe 10 and the rolling roll 110. In order to form a predetermined gap therebetween, there is provided a pair of copying rollers 22 that protrude below the surface acoustic wave probe 10 toward the rolling roll 110.
- Fig. 11 is an enlarged front view of this state.
- a shaft 24 is provided on each of both opposing sides of the probe holder 12 along the horizontal direction (roll axis direction).
- Each of the copying rollers 22 is rotatably mounted.
- the scanning roller 22 supported by the probe holder 12 receives an appropriate pressing force by the spring, so that it always comes into contact with the surface of the rolling roll 110 during measurement.
- the probe holder 12 holds the surface wave probe 10 so that a constant gap is always maintained between the surface wave probe 10 and the rolling roll 110. I have.
- a water supply part (water supply means) is provided inside. 26 is provided, and the water guided from the conduit 28 is temporarily stored in the storage part 26 A, and is discharged from the discharge hole 26 B provided at the bottom of the storage part 26 A.
- a water layer having no air bubbles can be formed between the tube 110 and the rolling roll 110.
- the water supply means may be configured by using a conventionally known appropriate means, and a detailed description thereof will be omitted.
- reference numeral 30 denotes a scraper that removes the water supplied by the water supply unit 26 so that the water does not remain on the roll surface and flow into the surface wave propagation path as described above. It is.
- the ultrasonic flaw detector of the present embodiment has the above-described apparatus configuration, water serving as an ultrasonic wave propagation medium is supplied between the surface wave probe 10 and the surface of the rolling roll 110 serving as a subject.
- the flaw detection operation can be performed easily and reliably while scanning and moving the probe 10 on its surface.
- 500 pre-rolls for hot finish rolling (a high speed mill) Inspection of the amount of grinding until the reflected wave from a primary crack, called a heat crack, fell below a specified level was performed.
- the actual grinding amount (converted to a diameter) of a scratching device using a surface wave probe having a wavelength about five times the surface wave wavelength was 0.33 mm, but in the present embodiment, it was 0.20 mm. It has been confirmed that the grinding amount can be reduced by 0.1 mm or more compared to the past. Even in this case, the occurrence of surface defects on the material to be rolled due to minute chipping on the high-speed roll surface was not different from the conventional case.
- the rolling roll 110 is a high-speed roll
- the rotation speed of the high-speed roll is detected by a rotation speed detector 32 and sent to a flow control valve 34 provided in a water supply device. Then, the flow rate is controlled to be within the range shown in Fig. 6.
- the output of the surface acoustic wave probe 10 is input to the defect determination circuit 44 via the ultrasonic transceiver 40 and the gate circuit 42.
- the ultrasonic transceiver 40 supplies an electric pulse for transmitting a surface wave to the surface wave probe 10, amplifies a signal captured by the surface wave probe 10 to a level necessary for defect determination, Output to gate circuit 42.
- the gate circuit 42 extracts a signal to be subjected to defect determination from the signal output from the ultrasonic transceiver 40 and outputs the signal to the defect determination circuit 44.
- the defect determination circuit 44 detects the amplitude of the signal output from the gate circuit 42 and outputs it, or compares the level of the signal with a predetermined threshold value. It operates to output a presence signal, which detects surface defects.
- the probe holder 12 includes a water supply unit 26 therein as shown in FIG.
- the water supply section 26 is controlled by a flow control valve 34 to a flow rate corresponding to the rotation speed (peripheral speed) of the rolling mill 110, and the water guided from the conduit 28 is supplied to the water supply section 26.
- This is temporarily stored in the storage section 26A, and is discharged from the discharge port 26B provided at the bottom of the storage section 26A. Water without bubbles is present between the surface wave probe 10 and the rolling roll 110.
- the layer of is formed.
- the polishing apparatus of the rolling roll 110 is used before the start of grinding or during the grinding.
- An apparatus for transmitting the set value of the grinding amount to 0 is shown.
- the apparatus for grinding the rolling rolls a conventionally known appropriate apparatus may be used, and illustration is omitted to avoid complication of the drawings.
- An ultrasonic flaw detector 50 is connected to the surface wave probe 10, and supplies an electric pulse for transmitting a surface wave from the surface wave probe 10 to the surface wave probe 10.
- the amplifier 10 amplifies the received signal to a level suitable for defect determination.
- the ultrasonic flaw detector 50 uses a gate circuit (not shown) similar to that of the second embodiment to extract a reflected wave from thermal or mechanical damage from the amplified signal and determine the height thereof. To detect.
- the reflected wave height from the thermal / mechanical damage detected by the ultrasonic flaw detector 50 is sent to the computer 52, and the thermal-mechanical damage is determined by referring to the relationship in FIG. The amount of grinding required for removal is required.
- the set value of the grinding amount obtained in this way is sent to a rolling roll grinding device 60, and grinding is performed using, for example, a grindstone.
- the other points are the same as those of the first and second embodiments, and the detailed description thereof will be omitted using the same reference numerals.
- a position detector 36 for detecting the position of the surface wave probe 10 in the roll axis direction is provided, and the computer 52 receives the surface wave probe 10 from the position detector 36. Position in the direction of the roll axis is detected and sent.In ultrasonic flaw detection using surface waves before or during grinding, the height of the reflected wave from the thermally / mechanically damaged part is the highest. The position of the high part on the rolling roll is required. Also, when performing grinding called plunge grinding, as shown in FIG. 9, the position where the surface wave probe 10 and the grindstone 62 abut on the rolling roll 110 (the position in the axial direction of the roll) is reduced. As shown, the surface acoustic wave probe 10 is installed with mechanical alignment.
- the other configuration is the same as that of the third embodiment, so that the same reference numerals are used and the detailed description is omitted.
- the surface wave probe 10 is scanned in the axial direction of the rolling roll 110 while rotating the rolling roll 110 in its circumferential direction C.
- Ultrasonic flaw detection using surface waves on the entire surface of the rolling roll was performed, and the height of the reflected waves from the thermally and mechanically damaged parts and the computer 52 to which the position detection signal of the surface wave probe 10 was input were used.
- the position on the rolling roll 110 of the portion where the height of the reflected wave from the thermally and mechanically damaged portion is the highest is determined.
- the surface wave probe 10 and the grindstone 62 are moved to this position, and the height of the reflected wave from the thermally or mechanically damaged portion falls below a predetermined threshold value. Plunge grinding of the rolling roll 110 is performed while performing ultrasonic inspection, and the grinding amount at this time is obtained.
- the set value of the grinding amount thus obtained is input to the rolling roll grinding device 60, and the remaining roll surface is ground.
- the apparatus of this embodiment 200 pre-work rolls for hot finishing rolling were inspected for flaws, and the results of the grinding amount were investigated.
- the estimated value of the polishing amount by the method of repeating until the reflected wave from the mechanically damaged portion falls below a predetermined threshold value was 0.24 mm in diameter conversion. It was 19 mm, confirming that the grinding amount could be reduced by more than 0.05 mm compared to the conventional method.
- FIGS. Figures 17 and 18 show the results of measuring artificial defects processed into the five types of rolls shown in Table 1 using the surface acoustic wave probe of the present invention and two types of conventional surface acoustic wave probes.
- FIG. Figure 17 is a graph that measures the height of the reflected wave of the artificial defect
- Figure 18 is a graph that measures the S / N ratio of the reflected wave of the artificial defect.
- Artificial defects are made by drilling lmm ⁇ , 1mm deep vertical drill holes on each roll surface.
- the wedge of the surface wave probe is polystyrene resin here
- Probe F Averaged the surface wave velocities of the five types of target rolls, and calculated from the average value CRav and the ultrasonic velocity CW of the polystyrene resin using equation (2).
- the probe F of the present invention can stably obtain a high reflected wave height and an SZN ratio regardless of the type of roll.
- the vertical axis in FIG. 17 shows the reflected wave height as O dB when the artificial defect of roll number # 1 is detected by the surface wave probe F.
- the present invention has been specifically described.
- the present invention is not limited to the embodiments described above, and can be variously modified without departing from the gist thereof.
- specific materials of the ultrasonic vibrator 10A, the damping material 10B, and the resin wedge 10C, which are members constituting the surface acoustic wave probe are not limited to those described in the above embodiment. Any material having the same function can be used.
- the case where water is used as the contact medium has been described. May be used.
- the application of the present invention is not limited to a rolling roll, particularly a high-speed roll, and is not particularly limited as long as it is a cylindrical body such as a roller made of metal or the like.
- Resonator material Resin material Frequency bandwidth Pulse width Wavelength From primary crack Remarks
- ADVANTAGE OF THE INVENTION when carrying out ultrasonic flaw detection using a surface wave, overdetection of a primary crack can be prevented, and deterioration of the roll basic unit by overgrinding can be prevented. Furthermore, the level of noise from the primary crack II crystal grain boundaries can be reduced, and the defect detection ability can be greatly improved.
- the present invention to the ultrasonic inspection method for rolls using surface waves, it is possible to transmit and receive surface waves with high efficiency despite differences in roll materials due to differences in manufacturing methods. This makes it possible to perform flaw detection without replacing the probe, and it is possible to increase the S / N ratio of the reflected wave from the defect using a common surface wave probe.
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Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU96504/98A AU752801C (en) | 1997-10-31 | 1998-10-29 | Method and apparatus for ultrasonically detecting flaw on surface of circular cylinder, and method of grinding roll utilizing the same |
US09/319,979 US6446509B1 (en) | 1997-10-31 | 1998-10-29 | Method and apparatus for ultrasonic testing of the surface of columnar structures, and method for grinding rolls by use of them |
CA002276319A CA2276319C (en) | 1997-10-31 | 1998-10-29 | Method and apparatus for ultrasonically testing of the surface of columnar structures, and method for grinding rolls by use of them |
BRPI9806287-5A BR9806287B1 (pt) | 1997-10-31 | 1998-10-29 | método e aparelho para teste ultra-sÈnico de estruturas colunares. |
EP98950442A EP0965839A4 (en) | 1997-10-31 | 1998-10-29 | METHOD AND DEVICE FOR DETECTING ERRORS IN CYLINDER SURFACES AND APPLICATION OF THIS METHOD TO ROLLING REELS |
US09/716,327 US6341525B1 (en) | 1997-10-31 | 2000-11-21 | Method and apparatus for ultrasonic testing of the surface of columnar structures, and method for grinding rolls by use of them |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9300409A JPH11133005A (ja) | 1997-10-31 | 1997-10-31 | ロール検査用表面波プローブとその入射角設定方法 |
JP9/300409 | 1997-10-31 | ||
JP33021397 | 1997-12-01 | ||
JP9/330213 | 1997-12-01 | ||
JP10/128912 | 1998-05-12 | ||
JP12891298 | 1998-05-12 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US09/319,979 Division US6446509B1 (en) | 1997-10-31 | 1998-10-29 | Method and apparatus for ultrasonic testing of the surface of columnar structures, and method for grinding rolls by use of them |
Publications (1)
Publication Number | Publication Date |
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WO1999023486A1 true WO1999023486A1 (fr) | 1999-05-14 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP1998/004897 WO1999023486A1 (fr) | 1997-10-31 | 1998-10-29 | Procede et appareil de detection par ultrasons des defauts sur la surface d'un cylindre circulaire, et procede de meulage d'un cylindre utilisant cet appareil |
Country Status (9)
Country | Link |
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US (2) | US6446509B1 (ja) |
EP (1) | EP0965839A4 (ja) |
KR (2) | KR100400184B1 (ja) |
CN (3) | CN1254679C (ja) |
AU (1) | AU752801C (ja) |
BR (1) | BR9806287B1 (ja) |
CA (1) | CA2276319C (ja) |
TW (1) | TW572208U (ja) |
WO (1) | WO1999023486A1 (ja) |
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- 1998-10-29 CA CA002276319A patent/CA2276319C/en not_active Expired - Fee Related
- 1998-10-29 US US09/319,979 patent/US6446509B1/en not_active Expired - Fee Related
- 1998-10-29 KR KR10-1999-7005927A patent/KR100400184B1/ko not_active IP Right Cessation
- 1998-10-29 BR BRPI9806287-5A patent/BR9806287B1/pt not_active IP Right Cessation
- 1998-10-29 EP EP98950442A patent/EP0965839A4/en not_active Withdrawn
- 1998-10-29 CN CNB021442673A patent/CN1254679C/zh not_active Expired - Fee Related
- 1998-10-29 WO PCT/JP1998/004897 patent/WO1999023486A1/ja not_active Application Discontinuation
- 1998-10-29 KR KR10-2002-7001215A patent/KR100390101B1/ko not_active IP Right Cessation
- 1998-10-29 AU AU96504/98A patent/AU752801C/en not_active Ceased
- 1998-10-29 CN CNB031368867A patent/CN1253713C/zh not_active Expired - Fee Related
- 1998-10-29 CN CNB988029502A patent/CN1163746C/zh not_active Expired - Fee Related
- 1998-10-30 TW TW091209107U patent/TW572208U/zh not_active IP Right Cessation
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Also Published As
Publication number | Publication date |
---|---|
AU752801C (en) | 2003-06-12 |
CA2276319C (en) | 2006-03-28 |
BR9806287B1 (pt) | 2011-11-01 |
EP0965839A4 (en) | 2001-09-26 |
CN1254679C (zh) | 2006-05-03 |
US6341525B1 (en) | 2002-01-29 |
AU9650498A (en) | 1999-05-24 |
BR9806287A (pt) | 2000-01-25 |
EP0965839A1 (en) | 1999-12-22 |
CA2276319A1 (en) | 1999-05-14 |
KR100400184B1 (ko) | 2003-10-01 |
CN1249814A (zh) | 2000-04-05 |
CN1253713C (zh) | 2006-04-26 |
CN1163746C (zh) | 2004-08-25 |
CN1515900A (zh) | 2004-07-28 |
AU752801B2 (en) | 2002-10-03 |
KR20000069786A (ko) | 2000-11-25 |
CN1492228A (zh) | 2004-04-28 |
TW572208U (en) | 2004-01-11 |
KR20020012641A (ko) | 2002-02-19 |
US6446509B1 (en) | 2002-09-10 |
KR100390101B1 (ko) | 2003-07-04 |
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