CN108279269B - Method for measuring crack depth of V-shaped roller by using ultrasonic continuous variable angle incidence - Google Patents
Method for measuring crack depth of V-shaped roller by using ultrasonic continuous variable angle incidence Download PDFInfo
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- CN108279269B CN108279269B CN201710005872.0A CN201710005872A CN108279269B CN 108279269 B CN108279269 B CN 108279269B CN 201710005872 A CN201710005872 A CN 201710005872A CN 108279269 B CN108279269 B CN 108279269B
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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
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
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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
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
- G01N2291/0234—Metals, e.g. steel
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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
- G01N2291/269—Various geometry objects
Abstract
The invention discloses a method for measuring the crack depth of a V-shaped roller by using ultrasonic continuous variable angle incidence, which relates to the technical field of nondestructive inspection of the quality of the V-shaped roller. The invention relates to a method for measuring the crack depth of a V-shaped roller by using ultrasonic continuous variable angle incidence, which is beneficial to the early-stage safety judgment of whether the roller can be used normally or not, provides a quantitative means for the accumulation of the use experience of the roller and can solve the problem that the current deep crack of the V-shaped roller at the bottom of the roller cannot be quickly and conveniently detected and evaluated on site.
Description
Technical Field
The invention relates to the technical field of nondestructive inspection of the quality of a V-shaped roller, in particular to a method for measuring the crack depth of the V-shaped roller by using ultrasonic continuous variable angle incidence.
Background
Most of the special-shaped rollers adopted by domestic strip steel manufacturers for producing billets are imported from abroad, after a certain amount of billet products are rolled by the rollers, the bottom of a V-shaped groove can crack, and the crack distribution form after magnetic powder inspection is shown in figure 1. The deepest cracks mostly exist in the center of the bottom of the V-shaped groove, the deeper the cracks are, the greater the damage is, and the depths of some cracks can reach dozens of millimeters. Since such rolls are heavy in weight, a suitable approach would be to perform crack depth detection in situ.
For crack depth detection of the V-shaped roller, the detection of the depth by using a magnetic method has certain difficulty due to the limitation of the shape, the size, the crack depth and the like. The method for detecting a surface open crack includes a surface acoustic wave propagation time measuring method, a crack tip end echo measuring method, and the like, but the above-described detection method is often used for detecting a crack depth of a crack of a type which does not penetrate through the upper and lower surfaces of a flat steel material. When diffraction signal detection is involved, a pair of ultrasonic sensors with the same parameters are adopted in a detection mode to measure two sides of a crack in different modes, and when the ultrasonic wave detection method is applied to a surface of a V-shaped roller which is close to the bottom of a V-shaped groove and has a radian, if a similar method is adopted, the ultrasonic sensor contact surface needs to be processed to adapt to the cambered surface of a workpiece to be detected, so that sound waves can be transmitted into the workpiece. The depth of the cracks at the bottom of the V-shaped roller groove is not fixed, if a method such as end diffraction is adopted, the sound waves are generally incident by an inclined probe with a fixed angle, and the radian of a detection surface is different due to different distances from the bottom of the groove, so that trouble is caused to the manufacture of a sensor. Meanwhile, the method is not easy to use because the diffraction or reflection signals are difficult to identify under the condition of weak acoustic signals.
Disclosure of Invention
The invention aims to measure the crack depth of the V-shaped roller by ultrasonic continuous variable angle incidence, can conveniently and quickly detect all possible crack depths of the V-shaped roller on a production site on the inclined surface of the V-shaped roller, is favorable for early-stage safety judgment on whether the roller can be used normally or not, and provides a quantitative means for accumulation of use experience of the roller.
The technical problem to be solved by the invention can be realized by the following technical scheme:
a method for measuring the crack depth of a V-shaped roller by using ultrasonic continuous variable angle incidence comprises the following steps:
s1, emitting ultrasonic waves into the roller through a water coupling effect on the inclined surface of the V-shaped roller;
s2, continuously changing the incidence angle of the ultrasonic wave, and measuring the incidence angle theta of the ultrasonic wave on the inclined plane of the V-shaped roller through a portable angle measuring rotating device; the angle θ is fixed within a certain range and continuously variable, because the crack depth, i.e. the position of the crack tip, is not known before the measurement;
s3, gradually increasing the incident angle theta of the ultrasonic wave in the roller, refracting the ultrasonic wave in the roller and gradually approaching the crack tip, generating a diffraction signal when the ultrasonic wave meets the tip, and detecting whether a signal CE of the diffraction action between the corresponding refracted transverse wave and the crack tip C is generated by an ultrasonic sensor on the other side of the V-shaped roller inclined plane; the sensor can move back and forth on the inclined plane on the other side of the V-shaped roller, so that the sensor can receive the generated sound wave diffraction signals;
s4, determining an incident angle theta, further determining a corresponding cracking tip position C, and determining a sound wave refraction angle α when an ultrasonic diffraction signal appears at the cracking tip under the condition that the diffraction signal is detected;
s5, calculating the crack depth VC of the V-shaped roller groove bottom by combining the ultrasonic incident point and the distance β between the ultrasonic incident point and the crack on the roller surface and the bottom of the S' V, V roller section groove,
further, the incident angle theta of the incident ultrasonic waves on the inclined surface of the V-shaped roll can be accurately measured and adjusted and controlled, and the adjustment range of the incident angle theta is set between the first critical angle and the second critical angle of the water-steel, namely 14.7-27.7 deg.
Further, in the case of a deep crack, it is desirable to place the portable goniometer on the slope relatively far from the bottom of the groove, so that the refraction angle can be increased and the reflected and diffracted signals can be enhanced.
Further, under the condition that the crack is not deep, the portable angle rotation device is suitable to be arranged on the inclined plane at a position relatively close to the bottom of the groove, so that focused ultrasonic energy entering the roller can more act on the end part of the crack, and the reflected signal and the diffraction signal are enhanced.
Furthermore, the vertical section of the crack and the roller body is suitable for one-time detection from the inclined planes on the two sides of the groove bottom, and the portable angle-measuring rotating device is arranged on the inclined plane as close to the crack as possible, so that the reflected signal can be detected more favorably.
Further, the crack depth VC is calculated as follows,
the invention has the beneficial effects that: a method for measuring the crack depth of a V-shaped roller by using ultrasonic continuous variable angle incidence can conveniently and quickly detect the crack depth of the V-shaped roller on a production site, and is convenient to solve the problem that the deeper cracks of the V-shaped roller cannot be subjected to depth detection evaluation in site implementation; the method is favorable for the early safe judgment of whether the roller can be used normally or not, and provides a quantitative means for the accumulation of the use experience of the roller.
Drawings
The invention is further described with reference to the following figures and detailed description:
FIG. 1 is a view showing the distribution of cracks in V-grooves of a roll;
FIG. 2 is a schematic diagram of the principle of measuring the crack depth of a V-shaped roller by ultrasonic continuous variable angle incidence;
fig. 3 is a graph of a sound pressure reciprocation transmittance calculation result at the time of oblique incidence;
FIG. 4 is a flow chart of the present invention;
FIG. 5 is a schematic diagram of the principle of measuring the depth of the V-shaped roller crack by the vertical section of the crack and the roller body.
Detailed Description
In order to make the contents and advantages of the technical solution of the present invention more clear, a method for measuring the crack depth of a V-roll by using ultrasonic continuous variable angle incidence according to the present invention is further described below with reference to the accompanying drawings.
In the concrete implementation, the crack of the bottom of the V-shaped roller is detected by taking the crack in the bottom of the V-shaped roller and taking the crack in the depth direction of the vertical section of the roller body as an example. The ultrasonic wave continuous variable angle incidence principle schematic diagram for measuring the crack depth of the V-shaped roller is combined with the figure 2, the overall appearance and size conditions of the V-shaped roller are analyzed, the ultrasonic wave is adopted to detect the crack depth of the bottom of the V-shaped groove, and the detection is most suitable for being realized on the inclined plane of the V-shaped roller. Meanwhile, the detection of diffraction signals generated after the ultrasonic waves and the crack tips act is involved, the sound intensity of the diffraction signals is generally relatively weak, the energy of return sound signals obtained by measurement is required to be as large as possible so as to be beneficial to detection, and besides the fact that focused sound waves can be adopted, relatively high sound waves generated in the steel are required to be utilizedThe fluctuation pattern of the transmittance is reciprocated. Combining the calculated result graph of sound pressure reciprocal transmittance at oblique incidence, as shown in FIG. 3, using TLLAnd TLSRespectively represents the sound pressure reciprocal transmittance when the water-steel incident wave is converted into longitudinal wave and transverse wave, and the incident angle α of the water-steel incident waveLLess than the first (14.53) and second (27.27) critical angles, TLLAll are below 25 percent, TLSCan reach below 40%, and can obtain larger reciprocating energy by adopting refracted transverse waves.
A method for measuring the crack depth of a V-shaped roller by using ultrasonic continuous variable angle incidence is combined with a flow chart 4 and comprises the following steps:
s1, at a certain position on the inclined plane of the V-shaped roller, the ultrasonic waves are incident into the roller through the water coupling effect; the incident characteristics of the ultrasonic waves can be realized by continuously changing the incident angle, for example, the incident sound beam can rotate around a certain point on the sound beam;
s2, continuously changing the incidence angle of the ultrasonic wave, and measuring the incidence angle theta of the ultrasonic wave on the inclined plane of the V-shaped roller through a portable angle measuring rotating device; the angle θ is fixed within a certain range and continuously variable, because the crack depth, i.e. the position of the crack tip, is not known before the measurement;
s3, when the incident angle of the sound beam is gradually increased, the refracted sound wave is gradually close to the crack tip and meets the crack tip, a diffraction signal is generated, and on the other side of the inclined plane of the V-shaped roller, an ultrasonic sensor detects whether a signal CE that the corresponding refracted transverse wave and the crack tip C are subjected to diffraction action occurs or not; the sensor can move back and forth on the inclined plane on the other side of the V-shaped roller, so that the sensor can receive the generated sound wave diffraction signals;
s4, determining an incident angle theta, further determining a corresponding cracking tip position C, and determining a sound wave refraction angle α when an ultrasonic diffraction signal appears at the cracking tip under the condition that the diffraction signal is detected;
s5, calculating the crack depth VC of the V-shaped roller groove bottom by combining the ultrasonic incident point and the distance β between the ultrasonic incident point and the crack on the roller surface and the bottom of the S' V, V roller section groove,
the portable angle measuring rotating device can realize two key points: the coupling between the sound waves and the V-shaped roller is conveniently and quickly realized on the inclined surface of the V-shaped roller; the incident angle of the incident ultrasonic on the inclined surface of the V-shaped roller can be accurately measured, adjusted and controlled, and the adjustment range of the incident angle is set between the first critical angle and the second critical angle of the water-steel, namely 14.7-27.7 degrees.
In the implementation process of the method, various combination conditions such as different depths of the cracks, the vertical sections of the cracks and the roller body, whether the reflected signals at the ends of the cracks can be detected, and the like can be met. In the use process, the distance between the portable angle measuring rotating device and the groove bottom on the inclined plane of the V-shaped roller needs to be correspondingly adjusted according to the distribution form of cracks, and the measurement result is analyzed and obtained according to the detected signal. Under the condition of deeper cracks, the portable angle measuring rotating device is suitable to be arranged on the inclined plane at a position relatively far away from the bottom of the groove, so that the refraction angle can be increased, and the reflection signal and the diffraction signal are enhanced; under the condition that the crack is not deep, the portable angle-measuring rotating device is suitable to be arranged on the inclined plane at a position relatively close to the bottom of the groove, so that focused ultrasonic energy entering the roller can more act on the end part of the crack, and reflected signals and diffraction signals are enhanced; referring to FIG. 5, the principle schematic diagram of measuring the depth of the V-shaped roller crack on the vertical section of the crack and the roller body is that the crack and the roller body are suitable for one-time detection on the inclined planes at the two sides of the bottom of the groove, and a portable angle-measuring rotating device is arranged on the inclined plane as close to the crack as possible, which is more beneficial to detecting a reflection signal, and the crack depth VC is calculated as follows,
the invention relates to a method for measuring the crack depth of a V-shaped roller by using ultrasonic continuous variable angle incidence, which measures the crack depth of the V-shaped roller by using an ultrasonic continuous variable angle incidence method, conveniently and quickly detects all possible crack depths of the V-shaped roller on a production site on a V-shaped roller inclined plane so as to be beneficial to early-stage safety judgment of whether the roller can be continuously and normally used, provides a quantification means for accumulation of use experience of the roller and can solve the problem that the current deeper cracks of the V-shaped roller at the bottom of the roller can not be quickly and conveniently detected and evaluated on site.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A method for measuring the crack depth of a V-shaped roller by using ultrasonic continuous variable angle incidence is characterized by comprising the following steps:
s1, emitting ultrasonic waves into the roller through a water coupling effect on the inclined surface of the V-shaped roller;
s2, continuously changing the incidence angle of the ultrasonic wave, and measuring the incidence angle theta of the ultrasonic wave on the inclined plane of the V-shaped roller through a portable angle measuring rotating device;
s3, gradually increasing the incident angle theta of the ultrasonic wave in the roller, refracting the ultrasonic wave in the roller and gradually approaching the crack tip, generating a diffraction signal when the ultrasonic wave meets the tip, and detecting whether a signal CE of the diffraction action between the corresponding refracted transverse wave and the crack tip C is generated by an ultrasonic sensor on the other side of the V-shaped roller inclined plane;
s4, determining an incident angle theta, further determining a corresponding cracking tip position C, and determining a sound wave refraction angle α when an ultrasonic diffraction signal appears at the cracking tip under the condition that the diffraction signal is detected;
s5, calculating the crack depth VC of the V-shaped roller groove bottom by combining the ultrasonic incident point and the distance β between the ultrasonic incident point and the crack on the roller surface and the bottom of the S' V, V roller section groove,
the incidence angle theta is in the range of 14.7-27.7 deg.
2. The method for determining the crack depth of a V-roll using ultrasonic continuous variable angle incidence according to claim 1, wherein: the portable angle-measuring rotating device is arranged on the inclined plane and far away from the bottom of the groove.
3. The method for determining the crack depth of a V-roll using ultrasonic continuous variable angle incidence according to claim 1, wherein: the portable angle-measuring rotating device is arranged on the inclined plane and close to the bottom of the groove.
4. The method for determining the crack depth of a V-roll using ultrasonic continuous variable angle incidence according to claim 1, wherein: the crack is perpendicular to the cross section of the roller body, and the portable angle-measuring rotating device is arranged on the inclined plane and close to the crack.
5. The method for measuring the crack depth of a V-roll using ultrasonic continuous variable angle incidence according to claim 4, wherein: the crack depth VC is calculated as follows,
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109142526B (en) * | 2018-08-24 | 2021-04-23 | 株洲硬质合金集团有限公司 | Method for detecting internal defects of hard alloy roller |
| CN111238425B (en) * | 2018-11-29 | 2021-11-12 | 宝山钢铁股份有限公司 | Method for detecting crack depth of V-shaped groove bottom of section steel roller |
| CN111595937B (en) * | 2019-02-21 | 2023-07-11 | 宝山钢铁股份有限公司 | Method for measuring crack depth of V-shaped roller by ultrasonic waves |
| CN111595274B (en) * | 2019-02-21 | 2022-03-18 | 宝山钢铁股份有限公司 | Testing device and testing method for rapidly detecting depth of full circumferential cracks at bottom of V-shaped groove of profile steel roller |
| CN111041949B (en) * | 2019-12-05 | 2020-11-27 | 同济大学 | Asphalt pavement crack depth detection method based on surface wave dispersion curve |
| CN114062489A (en) * | 2020-08-06 | 2022-02-18 | 宝山钢铁股份有限公司 | Grading type monitoring method for crack depth of roll neck of leveling roll |
| CN114062488A (en) * | 2020-08-06 | 2022-02-18 | 宝山钢铁股份有限公司 | Continuous monitoring method for crack depth of roll neck of leveling roll |
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