CN117705958A - Fish-shaped test block and calibration method thereof - Google Patents
Fish-shaped test block and calibration method thereof Download PDFInfo
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- CN117705958A CN117705958A CN202311716602.2A CN202311716602A CN117705958A CN 117705958 A CN117705958 A CN 117705958A CN 202311716602 A CN202311716602 A CN 202311716602A CN 117705958 A CN117705958 A CN 117705958A
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- 238000012360 testing method Methods 0.000 title claims abstract description 111
- 238000000034 method Methods 0.000 title claims abstract description 44
- 210000004690 animal fin Anatomy 0.000 claims abstract description 44
- 241000251468 Actinopterygii Species 0.000 claims abstract description 8
- 239000000523 sample Substances 0.000 claims description 59
- 238000010438 heat treatment Methods 0.000 claims description 22
- 230000008569 process Effects 0.000 claims description 22
- 238000010791 quenching Methods 0.000 claims description 18
- 230000000171 quenching effect Effects 0.000 claims description 18
- 238000005496 tempering Methods 0.000 claims description 17
- 238000001816 cooling Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 3
- 238000003754 machining Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 24
- 238000005242 forging Methods 0.000 abstract description 7
- 230000007547 defect Effects 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 abstract description 3
- 230000002349 favourable effect Effects 0.000 abstract 1
- 230000035945 sensitivity Effects 0.000 description 12
- 238000005259 measurement Methods 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/80—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in fisheries management
- Y02A40/81—Aquaculture, e.g. of fish
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Abstract
The invention discloses a fish-shaped test block and a calibration method thereof, which belong to the field of ultrasonic detection, wherein the fish-shaped test block comprises fish fin parts; the top surface of the fish fin part comprises a low plane, a concave curved surface and a high plane which are sequentially connected; the low plane and the high plane are horizontal planes; the concave curved surface is an inward concave arc curved surface, and the center of the concave curved surface is level with the high plane; the lowest point of the top surface of the fish fin part is positioned on the concave curved surface; of the two side surfaces of the fish fin part, the side surface connected with the high plane is a fish side straight surface, and the side surface connected with the low plane is a convex curved surface; the fish side straight surface is a vertical surface; the convex curved surface is an outwards convex arc curved surface, and the center of the convex curved surface is positioned on the concave curved surface; the radius of the concave curved surface is larger than that of the convex curved surface. The invention has the advantages of accurate positioning, smaller size, more favorable ultrasonic defect positioning and flaw detection of curved forging pieces, and the like.
Description
Technical Field
The invention belongs to a nondestructive testing ultrasonic curved surface test block detection method, relates to a curved surface test block for calibrating an ultrasonic testing instrument and a probe, and particularly relates to a fish-shaped test block and a calibration method thereof.
Background
In the past, both domestic and foreign ultrasonic probe manufacturers and third-party calibration laboratories cannot provide test reports of convex-curved inclined probes because no proper calibration test block exists.
When ultrasonic circumferential scanning and flaw detection are performed on concave-curved-surface forgings, castings, pipe fittings, welding seams and the like, accurate positioning of detected defects is always a difficult problem in the field of nondestructive detection due to lack of calibration test blocks. Taking circumferential oblique incidence detection of a forging as an example, the internationally adopted detection method is that a line is connected between maximum echo peaks obtained by utilizing notches of the inner wall and the outer wall of a product, and DAC lines are established, but defect accuracy positioning cannot be guaranteed. Therefore, developing a calibration test block of a curved surface oblique probe, accurately calibrating the incidence point, the refraction angle and the scanning zero point of the probe, and realizing accurate positioning flaw detection becomes an important problem to be solved urgently in the ultrasonic detection industry.
Disclosure of Invention
The invention provides a fish-shaped test block and a calibration method thereof, which are used for overcoming the defects of the prior art.
In order to achieve the above object, the present invention provides a fish-shaped test block having the following features: comprises a fish fin part; the top surface of the fish fin part comprises a low plane, a concave curved surface and a high plane which are sequentially connected; the low plane and the high plane are horizontal planes; the concave curved surface is an inward concave arc curved surface, and the center of the concave curved surface is level with the high plane; the lowest point of the top surface of the fish fin part is positioned on the concave curved surface; of the two side surfaces of the fish fin part, the side surface connected with the high plane is a fish side straight surface, and the side surface connected with the low plane is a convex curved surface; the fish side straight surface is a vertical surface; the convex curved surface is an outwards convex arc curved surface, and the center of the convex curved surface is positioned on the concave curved surface; the radius of the concave curved surface is larger than that of the convex curved surface.
Further, the present invention provides a fish-shaped test block, which may further have the following features: the center of the convex curved surface is positioned at the lowest point of the concave curved surface; the radius of the concave curved surface is twice the radius of the convex curved surface.
Further, the present invention provides a fish-shaped test block, which may further have the following features: the fish fin portion is provided with a test hole penetrating through the fish fin portion from front to back, and the test hole is located below the center of the convex curved surface.
Further, the present invention provides a fish-shaped test block, which may further have the following features: further comprising a base portion; the base part is positioned at the bottom of the fish fin part and is continuously connected with the bottom surface of the fish fin part.
Further, the present invention provides a fish-shaped test block, which may further have the following features: wherein the top surface of the base part is continuously connected with the bottom surface of the fish fin part; the two side surfaces of the base part are bottom side straight surfaces which are vertical surfaces, one bottom side straight surface is continuously connected with the fish side straight surface of the fish fin part, and the other bottom side straight surface is continuously connected with the convex curved surface of the fish fin part; the bottom surface of the base part is a test bottom surface which is a horizontal plane.
Further, the present invention provides a fish-shaped test block, which may further have the following features: wherein, the fish-shaped test block blank is subjected to heat treatment before final machining; the heat treatment process is a quenching and tempering process or a normalizing process; when the heat treatment process is a quenching and tempering process, the interval time from the end of quenching and cooling to the tempering in the furnace is less than 2 hours; heating to a temperature above Ac3 temperature point during quenching, and preserving heat for 1h to austenitize the blank tissue of the fish-shaped test block; when quenching is finished, placing the fish-shaped test block into quenching liquid for rapid cooling; when tempering, heating to the corresponding tempering temperature of the material, and preserving heat for 2 hours; when tempering is finished, placing the fish-shaped test block in static air for cooling; heating to a temperature above Ac3 temperature point when the heat treatment process is a normalizing process, and preserving heat for 1h to austenitize the blank tissue of the fish-shaped test block; when the heat treatment is carried out, the fish-shaped test blocks are not stacked.
Further, the present invention provides a fish-shaped test block, which may further have the following features: wherein, the front end face and the rear end face of the fish fin part and the base part are vertical planes which are continuously connected; the distance between the front end face and the rear end face is the thickness of the fish-shaped test block, the thickness of the fish-shaped test block is not less than 25mm, and preferably, the thickness of the fish-shaped test block is 25mm or 50mm.
Further, the present invention provides a fish-shaped test block, which may further have the following features: wherein, the front and rear ends of the lowest point of the top surface of the fish fin part are provided with rectangular grooves; the length of the rectangular notch is 10mm, and the depth is 4mm.
Further, the present invention provides a fish-shaped test block, which may further have the following features: the concave curved surface of the fish fin part is provided with arc length lines from the lowest point to the low plane, and the concave curved surface from the high plane to the lowest point is provided with angle lines. The invention also provides a calibration method of the fish-shaped test block, which has the following characteristics:
the invention provides a calibration method of the fish-shaped test block, which has the following characteristics: the method comprises the following steps: step one, calibrating a zero point of a convex curved surface probe and the sound velocity of a material, namely calibrating a time base line of a curved surface oblique probe; calibrating an incidence point of the convex curved surface inclined probe; and thirdly, calibrating the refraction angle of the convex curved surface inclined probe, namely measuring the sound beam angle of the curved surface inclined probe.
The invention has the beneficial effects that: the invention provides a standard test block-fish-shaped test block capable of calibrating angles, sound velocity and zero points of circumferential oblique detection concave curved surface forgings, which is suitable for accurately positioning horizontal, vertical and sound paths of circumferential oblique incidence ultrasonic flaw detection of hollow forgings, pipe fittings or welded seam pieces and other concave curved surface products. The fish-shaped test block in the invention not only can accurately measure the incident point, the sound beam angle and the like of the curved surface inclined probe, but also provides a measuring means for the planar inclined probe to be changed into the curved surface inclined probe and the maintenance of the curved surface inclined probe after the curved surface inclined probe is worn, thereby filling the blank of the curved surface detection technology of products in the field of nondestructive detection. The appearance of the fish-shaped test block can play an important role in improving the quality of steel products, and brings good social benefit and economic benefit.
Specifically, firstly, the invention can remarkably improve the accurate positioning capability of the ultrasonic oblique incidence defect. In ultrasonic detection of curved forgings, oblique incidence often occurs due to the special shape of the curved surface, and the conventional test block has lower detection accuracy under the condition. The fish-shaped test block provided by the invention can be better adapted to the shape of the curved forging through special shape design, so that the detection accuracy is improved. And secondly, the invention can be matched with various fish-shaped test blocks with arc radius of 50mm. This means that in the actual detection process, we can choose test blocks with different radii according to the specific shape of the product, so as to better adapt to the detection requirements under different conditions. The flexibility and the diversity enable the fish-shaped test block to have strong universality and adaptability in practical application. Most importantly, the fish-shaped test block calibration method can meet the requirement of accurate calibration of the instrument, and the instrument can be accurately calibrated by the specific test block calibration method, so that the measurement precision and accuracy of the instrument can be ensured, and the reliability of ultrasonic defect positioning flaw detection of curved products can be ensured.
Drawings
FIG. 1 is a front view of a fish-shaped test block;
FIG. 2 is a side view of a fish-shaped test block;
FIG. 3 is a diagram of the position of a curved surface detection oblique probe on a fish-shaped test block at the baseline of the calibration of the curved surface oblique probe in the calibration method of the fish-shaped test block;
FIG. 4 is a setup position of the probe at the time of setting sensitivity of the longitudinal wave probe in the calibration method of the fish-shaped test block;
FIG. 5 is a schematic diagram of the sensitivity setting of the oblique probe in the calibration method of the fish-shaped test block;
FIG. 6 is a schematic diagram of a curved surface detection probe for sensitivity setting without a gain adjuster in a calibration method of a fish-shaped test block;
FIG. 7 is a schematic illustration of a curved surface oblique probe incidence point determination in a calibration method of a fish-shaped test block;
FIG. 8 is a schematic illustration of the measurement of the angle of a curved inclined probe beam in a calibration method of a fish-shaped test block.
Detailed Description
Specific embodiments of the present invention are described below with reference to the accompanying drawings.
As shown in fig. 1 and 2, the present embodiment provides a fish-shaped test block including a fish fin portion 1 and a base portion 2.
The top surface of the fish fin 1 comprises a low plane 11, a concave curved surface 12 and a high plane 13 which are connected in sequence. The low plane 11 and the high plane 13 are both horizontal planes. The concave curved surface 12 is an inward concave arc curved surface, namely the section curve of the concave curved surface 12 is an arc line of a circle, and the center of the concave curved surface 12 is O 1 Flush with the upper plane 13. The lowest point of the top surface of the fish fin 1 is located on the concave curved surface 12.
Of the two side surfaces of the fin portion 1, the side surface contacting the high plane 13 is a fish-side straight surface 14, and the side surface contacting the low plane 11 is a convex curved surface 15. The fish-side straight surface 14 is a vertical surface. The convex curved surface 15 is an outwards convex arc curved surface, namely, the section curve of the convex curved surface 15 is an arc line of a circle, and the circle center O of the convex curved surface 15 2 On the concave curved surface 12. Specifically, the center O of the convex curved surface 15 2 At the lowest point of the concave curved surface 12.
Wherein the radius R of the concave curved surface 12 is larger than the radius R of the convex curved surface 15. In a preferred embodiment, r=2r.
The fish fin part 1 is provided with a front-back penetrating test hole 16, and the test hole 16 is positioned at the circle center O of the convex curved surface 15 2 Is below (c).
The base part 2 is positioned at the bottom of the fish fin part 1 and is continuously connected with the bottom surface of the fish fin part 1.
Specifically, the top surface of the base portion 2 is continuously connected to the bottom surface of the fin portion 1.
Both side surfaces of the base part are bottom straight surfaces 21 which are vertical surfaces, one bottom straight surface 21 is continuously connected with the fish-side straight surface 14 of the fish fin part 1, and the other bottom straight surface 21 is continuously connected with the convex curved surface 15 of the fish fin part 1. The bottom surface of the base part 2 is a test bottom surface 22 in a horizontal plane.
The front end face and the rear end face of the fish fin part 1 and the base part 2 are vertical planes which are continuously connected. The distance between the front end face and the rear end face is the thickness of the fish-shaped test block, and the thickness of the fish-shaped test block is not less than 25mm. In a preferred embodiment, the thickness of the fish-shaped test block is 25 mm.+ -. 0.1mm or 50 mm.+ -. 0.1mm.
Rectangular notch grooves are arranged at the front end and the rear end of the lowest point of the top surface of the fish fin part 1. In a preferred embodiment, the rectangular score groove has a length of 10mm and a depth of 4mm.
Arc length score lines are arranged on the concave curved surface 12 of the fish fin part 1 from the lowest point to the concave curved surface 12 of the low plane 11, so that the forward or incident point of the ultrasonic probe can be conveniently observed; an angle score line is arranged from the high plane 13 to the concave curved surface 12 from the lowest point, so that the movement angle of the ultrasonic probe can be conveniently observed.
The height of the base part 2 is 30mm + -0.1 mm. The wafer size of the general curved inclined probe is 10 multiplied by 10mm 2 The curved probe frequency is 2.5MHz, so λ=c/f=1.29 mm (where λ is wavelength; C is sound velocity; f is frequency). Because the sound path between the curved surface probe and the reflecting hole is more than 2 times of the near field area distance during the angle measurement of the curved surface probe, the influence of the near field area can be avoided, and therefore N is more than or equal to d 2 /(4×λ)＝10 2 /(4×1.29) =19.4 mm (where: N is the near field length; d is the probe diameter), meeting the minimum requirement of probe angle measurement error.
To obtain fine grain structure and good material uniformity, the fish-shaped test block blank is heat treated prior to final machining. The heat treatment process is a quenching and tempering process or a normalizing process.
When the heat treatment process is a quenching and tempering process, the interval time from the end of quenching and cooling to the tempering in the furnace is less than 2 hours; heating to a temperature above Ac3 temperature point during quenching, and preserving heat for 1h to austenitize the blank tissue of the fish-shaped test block; when quenching is finished, placing the fish-shaped test block into quenching liquid for rapid cooling; when tempering, heating to the corresponding tempering temperature of the material, and preserving heat for 2 hours; and (5) after tempering, placing the fish-shaped test block in static air for cooling.
And when the heat treatment process is a normalizing process, heating to a temperature above the Ac3 temperature point, and preserving heat for 1h to austenitize the blank tissue of the fish-shaped test block.
When the heat treatment is carried out, the fish-shaped test blocks are not stacked.
The parameters for the specific fish-shaped test block are shown in table 1.
TABLE 1 parameters for making fish-shaped test blocks
| Sequence number | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Radius R | 50 | 100 | 150 | 200 | 250 | 300 | 350 | 400 |
| radius r | 25 | 50 | 75 | 100 | 125 | 150 | 175 | 200 |
The angle score lines of the concave curved surface 12 of the fish fin 1 include long angle score lines P and short angle score lines. The calculation formula of the long angle score line P: p=r×sin (β), where β is 20 °, 30 °, 40 °, 50 °, 60 °, 70 °, 80 °. The calculation method of the short angle score lines is similar to the calculation method of the long angle score lines P, and the calculation method is 25 °, 35 °, 45 °, 55 °, 65 °, 75 °. The specific parameters of the long angle score line P are shown in table 2.
TABLE 2 parameters for making long-angle score lines P for fish-shaped test blocks
Remarks: the length units are all mm.
The roughness Ra is less than or equal to 6.3um.
The block parameters are shown in Table 3 below.
TABLE 3 parameters for making fish-shaped test blocks
Remarks: manufacturing requirements, indexing sequence number description: r is a radius of a semicircle, and the tolerance is +/-0.38 mm;
r-radius of semicircle, tolerance + -0.38 mm;
w-width, tolerance.+ -. 0.76mm;
h-height, tolerance + -0.76 mm;
h, supporting column height, tolerance + -0.38 mm;
l-platform length, tolerance + -0.38 mm;
p-angular position line, tolerance.+ -. 0.2mm.
20-typical steel grade material designation;
e, a concave curved surface test block;
0100-the semicircular radius of the test block is 100, and the unit mm; v4, a concave curved surface detection standard test block;
100-the radius of the outer circle is 100mm.
The calibration method of the fish-shaped test block specifically comprises the following steps:
step one, calibrating a zero point of a convex curved surface probe and the sound velocity of a material, namely calibrating a time base line of a curved surface oblique probe;
calibrating an incidence point of the convex curved surface inclined probe;
and thirdly, calibrating the refraction angle of the convex curved surface inclined probe, namely measuring the sound beam angle of the curved surface inclined probe.
The fish-shaped test block provides a measuring means for the planar inclined probe to be changed into the curved inclined probe and the curved inclined probe to be maintained after being worn, and fills the blank of the curved surface detection technology of products in the field of nondestructive detection.
In a specific embodiment, the calibration method of the fish-shaped test block is as follows:
(one), setting a time base line.
General rule: when the time base line is adjusted, the front edge (left side edge) is adjusted to be consistent with the scale corresponding to the instrument screen. The pulse propagation time depends on the speed of sound of the ultrasonic wave in the material to be examined.
Baseline when the curved surface inclined probe is calibrated: the time base line of R or R x cos (. Beta.) +30 was calibrated with a curved bevel probe. The position of the inclined probe for detecting the curved surface on the fish-shaped test block is shown as a in fig. 3, namely, the position is positioned at the center O of the convex curved surface of the fish-shaped test block 2 For R calibration distance, and as shown in fig. 3 b, i.e., on the angular scribe line of the concave curved surface, for r× (1-Cos (β)) +r+30 calibration distance. The instrument screen display for these two calibration ranges is also shown schematically in fig. 3 a and b. Verification of the time base line can also be adjusted using the primary and secondary reflections of r.
(II), sensitivity setting and probe verification
Longitudinal wave probe sensitivity setting: the probe being positioned in the figure 4 "a" position, i.e. in the planeAnd (5) debugging the sensitivity of the device. The sensitivity is set with the continuous echo displayed in the a-scan as a reference. Alternatively, the probe may be placed in the position "b" in FIG. 4, i.e., on the concave curved surface of the fish-shaped test block (specifically, on O of the concave curved surface 2 Where) the corresponding echo amplitude is maximized by using the echo of the test well having a diameter of 3mm, thereby setting the sensitivity.
Curved surface oblique probe:
sensitivity setting: the maximum echo of the test well with a diameter of 3mm is used as a reference for the sensitivity setting, as shown in fig. 5. Alternatively, the sensitivity setting may be performed by using two reflection surfaces with the acoustic paths R and r× (1-Cos (β)) +r+30mm, respectively. There are two methods of setting in this case: a) Using a calibrated gain adjuster, the echo from the reflecting surface is adjusted to 80% of the screen height and then to the level to be set. b) Instead of using a gain adjuster, the sensitivity is adjusted with a single echo from either the circumferential surface (i.e., concave curved surface 12) or the bottom surface (i.e., test bottom surface 22), as shown in fig. 6 a and b. Acoustic coupling is an important factor in verifying probes and the same coupling medium is used when making comparisons between probes.
Measuring the position of an incidence point of the curved surface probe: the curved surface probe is placed as in fig. 7 and moved back and forth on the 0 point line of the fish-shaped test block until the amplitude of the reflected echo from the r-plane (i.e., convex curved surface 15) is maximized. At this time, the incidence point of the probe coincides with the center of the 0 point scribe line on the fish-shaped test block.
Measurement of the angle of the acoustic beam: the angle of the beam is determined by echo from the bottom surface of the fish-shaped test block. The curved surface probe is moved in parallel over the circumferential surface of the calibration block (i.e., concave curved surface 12) until the amplitude of the reflected echo from the bottom surface of the fish-shaped block (i.e., test bottom surface 22) is maximized. The angle of the sound beam can be directly read from the scale value of the fish-shaped test block, which coincides with the incidence point of the probe, and can be obtained by adopting an interpolation method when the incidence point of the probe does not coincide with the scale line. A curved inclined probe of 20 ° to 80 ° was measured as shown in fig. 8.
In the present invention, unless otherwise indicated, scientific and technical terms used herein have the meanings commonly understood by one of ordinary skill in the art.
It should be noted that the terms like "upper", "lower", "left", "right", "front", "rear", and the like are also used for descriptive purposes only and are not intended to limit the scope of the invention in which the invention may be practiced, but rather the relative relationship of the terms may be altered or modified without materially altering the teachings of the invention.
Finally, it should be noted that: the above is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that the present invention is described in detail with reference to the foregoing embodiments, and modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A fish-shaped test block is characterized in that:
comprises a fish fin part;
the top surface of the fish fin part comprises a low plane, a concave curved surface and a high plane which are sequentially connected;
the low plane and the high plane are horizontal planes; the concave curved surface is an inward concave arc curved surface, and the center of the concave curved surface is level with the high plane; the lowest point of the top surface of the fish fin part is positioned on the concave curved surface;
of the two side surfaces of the fish fin part, the side surface connected with the high plane is a fish side straight surface, and the side surface connected with the low plane is a convex curved surface;
the fish side straight surface is a vertical surface; the convex curved surface is an outwards convex arc curved surface, and the center of the convex curved surface is positioned on the concave curved surface;
the radius of the concave curved surface is larger than that of the convex curved surface.
2. The fish-shaped test block of claim 1, wherein:
the center of the convex curved surface is positioned at the lowest point of the concave curved surface;
the radius of the concave curved surface is twice the radius of the convex curved surface.
3. The fish-shaped test block of claim 2, wherein:
the fish fin portion is provided with a test hole penetrating through the fish fin portion from front to back, and the test hole is located below the center of the convex curved surface.
4. The fish-shaped test block of claim 1, wherein:
further comprising a base portion;
the base part is positioned at the bottom of the fish fin part and is continuously connected with the bottom surface of the fish fin part.
5. The fish-shaped test block of claim 4, wherein:
wherein the top surface of the base part is continuously connected with the bottom surface of the fish fin part;
the two side surfaces of the base part are bottom side straight surfaces which are vertical surfaces, one bottom side straight surface is continuously connected with the fish side straight surface of the fish fin part, and the other bottom side straight surface is continuously connected with the convex curved surface of the fish fin part;
the bottom surface of the base part is a test bottom surface which is a horizontal plane.
6. The fish-shaped test block of claim 1, wherein:
wherein, the fish-shaped test block blank is subjected to heat treatment before final machining;
the heat treatment process is a quenching and tempering process or a normalizing process;
when the heat treatment process is a quenching and tempering process, the interval time from the end of quenching and cooling to the tempering in the furnace is less than 2 hours; heating to a temperature above Ac3 temperature point during quenching, and preserving heat for 1h to austenitize the blank tissue of the fish-shaped test block; when quenching is finished, placing the fish-shaped test block into quenching liquid for rapid cooling; heat preservation is carried out for 2 hours during tempering; when tempering is finished, placing the fish-shaped test block in static air for cooling;
heating to a temperature above Ac3 temperature point when the heat treatment process is a normalizing process, and preserving heat for 1h to austenitize the blank tissue of the fish-shaped test block;
when the heat treatment is carried out, the fish-shaped test blocks are not stacked.
7. The fish-shaped test block of claim 4, wherein:
wherein, the front end face and the rear end face of the fish fin part and the base part are vertical planes which are continuously connected;
the distance between the front end face and the rear end face is the thickness of the fish-shaped test block, and the thickness of the fish-shaped test block is not less than 25mm.
8. The fish-shaped test block of claim 1, wherein:
wherein, the front and rear ends of the lowest point of the top surface of the fish fin part are provided with rectangular grooves;
the length of the rectangular notch is 10mm, and the depth is 4mm.
9. The fish-shaped test block of claim 1, wherein:
the concave curved surface of the fish fin part is provided with arc length lines from the lowest point to the low plane, and the concave curved surface from the high plane to the lowest point is provided with angle lines.
10. A method of calibrating a fish-shaped test block according to any of claims 1-9, characterized in that:
the method comprises the following steps:
step one, calibrating a zero point of a convex curved surface probe and the sound velocity of a material;
calibrating an incidence point of the convex curved surface inclined probe;
and step three, calibrating the refraction angle of the convex curved surface inclined probe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311716602.2A CN117705958A (en) | 2023-12-14 | 2023-12-14 | Fish-shaped test block and calibration method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311716602.2A CN117705958A (en) | 2023-12-14 | 2023-12-14 | Fish-shaped test block and calibration method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117705958A true CN117705958A (en) | 2024-03-15 |
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ID=90149238
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311716602.2A Pending CN117705958A (en) | 2023-12-14 | 2023-12-14 | Fish-shaped test block and calibration method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117705958A (en) |
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2023
- 2023-12-14 CN CN202311716602.2A patent/CN117705958A/en active Pending
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