CN114441628A - Method for evaluating eddy current inspection resolution of roll grinder - Google Patents
Method for evaluating eddy current inspection resolution of roll grinder Download PDFInfo
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- CN114441628A CN114441628A CN202210094208.9A CN202210094208A CN114441628A CN 114441628 A CN114441628 A CN 114441628A CN 202210094208 A CN202210094208 A CN 202210094208A CN 114441628 A CN114441628 A CN 114441628A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
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Abstract
The invention discloses a method for evaluating eddy current flaw detection resolution of a roll grinder, belongs to the technical field of roll flaw detection methods, and solves the technical problem that an eddy current flaw detection device is easy to miss detection when an existing calibration unit is used. The method comprises the following steps: manufacturing a calibration roller; processing a plurality of axial artificial defects on the surface of the calibration roller along the axial direction of the calibration roller, and processing a plurality of circumferential artificial defects on the surface of the calibration roller along the circumferential direction of the calibration roller; erecting an eddy current flaw detection device; evaluating the plurality of axial artificial defects through the eddy current flaw detection device to obtain an axial detection result, and evaluating the plurality of circumferential artificial defects through the eddy current flaw detection device to obtain a circumferential detection result; and judging whether the obtained axial detection result data are matched with the processed axial artificial defect data or not, and judging whether the obtained circumferential detection result data are matched with the processed circumferential artificial defect data or not. The invention has the advantages of multiple measurement dimensions, more accurate measurement and low omission factor.
Description
Technical Field
The invention belongs to the technical field of roller flaw detection methods, and particularly relates to a method for evaluating eddy current flaw detection resolution of a roller grinder.
Background
The eddy current flaw detection device is mainly applied to flaw detection of rollers in a hot rolling production line, calibration equipment of the eddy current flaw detection device is used for instrument calibration, but the material and the defect direction of a calibration unit of the eddy current flaw detection device are different from those of the rollers actually inspected, the calibration rollers are single nick defects, the defect types are single, equivalent calibration can be performed only, sensitivity and coverage rate evaluation cannot be performed, and the problem of missed detection of the defects of the rollers after calibration is completed may exist.
Disclosure of Invention
The method for evaluating the eddy current inspection resolution of the roll grinder aims to solve the technical problem that the existing calibration unit is easy to cause the missing inspection of the eddy current inspection device at least to a certain extent.
The technical scheme of the application is as follows:
a method for evaluating eddy current inspection resolution of a roll grinder, comprising the steps of:
manufacturing a calibration roller;
machining a plurality of axial artificial defects on the surface of the calibration roller along the axial direction of the calibration roller, and machining a plurality of circumferential artificial defects on the surface of the calibration roller along the circumferential direction of the calibration roller;
erecting an eddy current flaw detection device;
evaluating a plurality of axial artificial defects through the eddy current flaw detection device to obtain an axial detection result, and evaluating a plurality of circumferential artificial defects through the eddy current flaw detection device to obtain a circumferential detection result;
and judging whether the obtained axial detection result data are matched with the processed axial artificial defect data or not, and judging whether the obtained circumferential detection result data are matched with the processed circumferential artificial defect data or not.
In some embodiments, in the step of manufacturing the calibration roller, a scrapped roller is selected as a raw material, and the surface of the roller is subjected to grinding treatment until the surface of the roller has no cracks.
In some embodiments, the roughness Ra of the calibration roll is 0.2 to 0.5 μm.
In some embodiments, the axial artificial defect is a plurality of axial artificial defects with increasing size along the axial direction, the increment of the axial artificial defect is 1mm, and the distance between the axial artificial defect and the end face of the calibration rod is more than 350 mm.
In some embodiments, the distance between two adjacent axial artificial defects is 50mm to 120 mm.
In some embodiments, the size of the circumferential artificial defects is gradually increased along the clockwise direction, the increment of the circumferential artificial defects is 1mm, and the distance between the axial artificial defects and the end face of the calibration rod is less than 300mm and more than 200 mm.
In some embodiments, the top end of the end surface of the calibration rod is at a 0-degree position, and the plurality of circumferential artificial defects are respectively arranged at the 0-degree position, the 90-degree position, the 180-degree position and the 270-degree position of the annular wall of the calibration rod.
In some embodiments, the axial artificial defect and the circumferential artificial defect are both circular, the axial artificial defect and the circumferential artificial defect having a diameter of 1mm to 12mm and a depth of 2mm to 6 mm.
In some embodiments, after the step of obtaining the circumferential test result, the obtained circumferential test result is analyzed to evaluate the edge coverage capability of the eddy current testing apparatus.
In some embodiments, a rust preventive oil is applied to the surface of the calibration stick after the measuring step is completed.
The embodiment of the application has at least the following beneficial effects:
according to the technical scheme, the method for evaluating the eddy current inspection resolution of the roll grinder disclosed by the invention has the advantages that the roll body with the size close to that of the roll to be measured is manufactured to serve as the calibration roll, so that the artificial defects are closer to the real defects on the roll to be measured, the actual resolution of the current eddy current inspection device for the roll to be measured is evaluated, the axial artificial defects and the circumferential artificial defects of the calibration roll are measured, the measurement dimensionality is large, the measurement is more accurate, and the omission ratio is low.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 shows a schematic flow diagram of a method in an embodiment of the present application;
FIG. 2 is a schematic structural diagram of a calibration roller in an embodiment of the present application;
the labels in the figure are: 1-calibration of the rolls, 2-axial artificial defects, 3-circumferential artificial defects.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.
The hot continuous rolling production line has high yield and fast production rhythm, and the turnover amount of daily working rolls is about 90 to ensure production of the production line. The defect repair of the roller is the root of preventing roller accidents, and the eddy current inspection system is a main way for monitoring the daily surface crack defect repair effect of the hot roller.
The eddy current flaw detection device is provided with a calibration device for instrument calibration. The material and the defect direction of the calibration unit are different from those of the actually inspected roller, and the calibration roller has single indentation defect and single defect type. The self-contained calibration original can only carry out equivalent calibration, cannot carry out sensitivity and coverage rate evaluation, and the roller defect possibly has the problem of missing detection after the calibration is finished. Therefore, an evaluation method for the actual resolution and sensitivity of eddy current flaw detection needs to be found.
The application is described below with reference to specific embodiments in conjunction with the following drawings:
as shown in fig. 1 and 2, the present embodiment provides a method for evaluating eddy current testing resolution of a roll grinder, including the steps of:
step 1: a calibration roll 1 was produced.
And 2, step: machining a plurality of axial artificial defects 2 on the surface of the calibration roller 1 along the axial direction of the calibration roller 1; a plurality of circumferential artificial defects 3 are machined on the surface of the calibration roller along the circumferential direction of the calibration roller 1.
And step 3: and erecting an eddy current flaw detection device.
And 4, step 4: evaluating the plurality of axial artificial defects 2 through an eddy current flaw detection device to obtain an axial detection result; and evaluating the plurality of circumferential artificial defects 3 through an eddy current flaw detection device to obtain a circumferential detection result.
And 5: and judging whether the obtained axial detection result data are matched with the processed axial artificial defect 2 data or not, and judging whether the obtained circumferential detection result data are matched with the processed circumferential artificial defect 3 data or not.
In the step 1, the outer ring wall of the roller to be measured has a radian, a roller body with a size close to that of the roller to be measured is manufactured as a calibration roller 1, so that artificial defects are closer to real defects on the roller to be measured, the actual resolution of the current eddy current flaw detection device for the roller to be measured is evaluated, and then the resolution of the eddy current flaw detection device for the roller to be measured is improved by adjusting the eddy current flaw detection device, so that high-resolution measurement can be realized.
In step 1, the surface of the rejected roll is ground until the surface of the roll has no cracks, the specification of the rejected roll in the hot rolling line is consistent with that of the roll to be measured, and specifically, the roughness Ra of the machined calibration roll 1 is 0.2-0.5 μm.
The specification of the roller after being ground and removed is similar to that of the roller to be measured, and the scrapped roller is used as the calibration rod, so that the accuracy of the actual resolution of detection is improved, and the cost for manufacturing the calibration rod can be greatly reduced.
In the step 2, the processed artificial defects comprise axial artificial defects 2 and circumferential artificial defects 3, when the artificial defects are processed, a drill bit with proper material and performance can be selected by using a hand drill or a drill floor, the diameter of the drill bit can be selected according to the requirement of the sensitivity of the eddy current flaw detection device by the production line, if the requirement of the sensitivity of the eddy current flaw detection device by the production line is 2mm, the diameter of the drill bit can be 1-2mm, the artificial defects not larger than the requirement of the sensitivity are processed, and the sensitivity of the eddy current flaw detection device is tested. The order of machining the axial artificial defects 2 and the circumferential artificial defects 3 can be adjusted according to the convenience of field machining.
Referring to fig. 2, the size of the circumferential artificial defects 3 gradually increases along the clockwise direction, the increment of the circumferential artificial defects 3 is 1mm, and the distance between the axial artificial defects 2 and the calibrated club end face is less than 300mm and more than 200 mm. As a specific embodiment, 4 circumferential artificial defects 3 are provided, the top end of the end surface of the calibration rod is set to be at a 0-degree position, and the circumferential artificial defects 3 are respectively arranged at a 0-degree position, a 90-degree position, a 180-degree position and a 270-degree position of the annular wall of the calibration rod. The projections of the centers of the plurality of circumferential artificial defects 3 on the axis of the calibration roller 1 can be positioned at the same point or arranged at intervals.
Referring to fig. 2, the sizes of the plurality of axial artificial defects 2 gradually increase along the axial direction, the distance between two adjacent axial artificial defects 2 is 50mm-120mm, the increment of the axial artificial defects 2 is 1mm, that is, the aperture of the axial calibration roll 1 is increased along the axial direction of the calibration roll in an equal difference manner, so as to conveniently judge the detection result.
In the specific application process, the axial artificial defects 2 and the circumferential artificial defects 3 are circular, the diameters of the axial artificial defects 2 and the circumferential artificial defects 3 are 1-12 mm, and the depths of the axial artificial defects and the circumferential artificial defects are 2-6 mm. And the length of the calibration roller 1 is longer, so that the sizes of a plurality of drill bits are within the interval of 1mm-12mm, and the number of the axial artificial defects 2 to be processed is ensured. Meanwhile, the distance between the axial artificial defect 2 and the end face of the calibration rod is larger than 350mm, so that the distance between the axial artificial defect 2 and the ring where the circumferential artificial defect 3 is located is larger, and mutual influence during testing is avoided.
In step 4 and step 5, through the measurement of the axial artificial defect 2, the eddy current histogram derived from the obtained detection result is evaluated for the defect equivalent detection capability through the amplitude of the eddy current histogram, and the axial resolution of the defect interval inspection equipment is checked through the eddy current histogram.
By measuring the circumferential artificial defect 3 and then evaluating the circumferential angular resolution and the defect detection capability of the device through the detection result, the eddy current histogram and the defect plane development map derived from the obtained detection result are used for determining the maximum defect amplitude through the histogram, distinguishing the defect detectable degree through the defect plane development map, and checking the axial resolution of the device.
Further, after the step of obtaining the circumferential detection result, analyzing the obtained circumferential detection result of the detection result to evaluate the edge coverage capability of the eddy current flaw detection device. Under the condition that the circumferential artificial defects 3 are spaced from the end face of the calibration roller 1 by 20mm-30mm, namely whether the outer ring face at the position 20mm away from the end face of the calibration roller 1 can be covered by the eddy current flaw detection device is evaluated through the detection result, if the covering is realized, the detection result of the eddy current flaw detection device on the edge and the detection result of the circumferential artificial defects 3 can be compared, and the sensitivity of the eddy current flaw detection device is further verified.
This embodiment further includes step 6: and after the measuring step is finished, coating rust preventive oil on the surface of the calibration stick. So that the calibration roller 1 can be reused, further reducing the measurement cost.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise" indicate orientations or positional relationships based on the orientation or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present application and for simplicity in description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be considered as limiting the present application.
It should be noted that all the directional indications in the embodiments of the present application are only used to explain the relative position relationship, the motion situation, and the like between the components in a certain posture, and if the certain posture is changed, the directional indication is changed accordingly.
In this application, unless expressly stated or limited otherwise, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In addition, descriptions in this application as to "first", "second", etc. are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.
In addition, technical solutions between the embodiments may be combined with each other, but must be based on the realization of the technical solutions by a person skilled in the art, and when the technical solutions are contradictory to each other or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope claimed in the present application.
While embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that: numerous changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the application, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A method for evaluating eddy current testing resolution of a roll grinder, comprising the steps of:
manufacturing a calibration roller;
machining a plurality of axial artificial defects on the surface of the calibration roller along the axial direction of the calibration roller, and machining a plurality of circumferential artificial defects on the surface of the calibration roller along the circumferential direction of the calibration roller;
erecting an eddy current flaw detection device;
evaluating a plurality of axial artificial defects through the eddy current flaw detection device to obtain an axial detection result, and evaluating a plurality of circumferential artificial defects through the eddy current flaw detection device to obtain a circumferential detection result;
and judging whether the obtained axial detection result data are matched with the processed axial artificial defect data or not, and judging whether the obtained circumferential detection result data are matched with the processed circumferential artificial defect data or not.
2. The method for evaluating the eddy current inspection resolution of a roll grinder according to claim 1, wherein in the step of manufacturing the calibration roll, a rejected roll is selected as a raw material, and the surface of the roll is ground until the surface of the roll is free from cracks.
3. The method for evaluating the eddy current testing resolution of a roll grinder according to claim 2, wherein the roughness Ra of the calibration roll is 0.2 to 0.5 μm.
4. The method for evaluating eddy current inspection resolution of a roll grinder according to claim 1, wherein a plurality of the axial artificial flaws gradually increase in size in the axial direction, the increment of the axial artificial flaws is 1mm, and the distance between the axial artificial flaws and the end face of the calibration rod is greater than 350 mm.
5. The method for evaluating eddy current inspection resolution of a roll grinder according to claim 4, wherein a pitch between two adjacent axial artificial defects is 50mm to 120 mm.
6. The method for evaluating eddy current inspection resolution of a roll grinder according to claim 1, wherein a plurality of the circumferential artificial flaws gradually increase in size in a clockwise direction, the increment of the circumferential artificial flaws is 1mm, and a distance between the axial artificial flaws and the end face of the calibration rod is less than 300mm and greater than 200 mm.
7. The method for evaluating the eddy current inspection resolution of a roll grinder according to claim 6, wherein the top end of the end surface of the calibration rod is set to a 0-degree position, and a plurality of the circumferential artificial flaws are respectively set to a 0-degree position, a 90-degree position, a 180-degree position, and a 270-degree position of the circumferential wall of the calibration rod.
8. The method for evaluating eddy current inspection resolution of a roll grinder of claim 1, wherein the axial synthetic flaws and the circumferential synthetic flaws are each circular in shape, and have a diameter of 1mm to 12mm and a depth of 2mm to 6 mm.
9. The method for evaluating the eddy current testing resolution of a roll grinder according to claim 1, wherein after the step of obtaining the test result circumferential direction test result, the obtained test result circumferential direction test result is analyzed to evaluate the edge coverage capability of the eddy current testing apparatus.
10. The method for evaluating the eddy current testing resolution of a roll grinder according to claim 1, wherein a rust preventive oil is applied to the surface of the calibration bar after the measuring step is completed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210094208.9A CN114441628A (en) | 2022-01-26 | 2022-01-26 | Method for evaluating eddy current inspection resolution of roll grinder |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210094208.9A CN114441628A (en) | 2022-01-26 | 2022-01-26 | Method for evaluating eddy current inspection resolution of roll grinder |
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| CN114441628A true CN114441628A (en) | 2022-05-06 |
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| CN202210094208.9A Pending CN114441628A (en) | 2022-01-26 | 2022-01-26 | Method for evaluating eddy current inspection resolution of roll grinder |
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