CN105319268A - Color grade determination method for defect in roller through airborne flaw detector - Google Patents
Color grade determination method for defect in roller through airborne flaw detector Download PDFInfo
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- CN105319268A CN105319268A CN201410363372.0A CN201410363372A CN105319268A CN 105319268 A CN105319268 A CN 105319268A CN 201410363372 A CN201410363372 A CN 201410363372A CN 105319268 A CN105319268 A CN 105319268A
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Abstract
The invention discloses a color grade determination method for a defect in a roller through an airborne flaw detector. The method employs a supersonic wave flaw detector to perform flaw detection on a working layer and a binding layer of the roller, and the reference sensitivity is set. The flaw detector takes the height of amplitude of supersonic wave as an evaluation index value; an actual measured value is an echo value received by a normal probe; and a display value is shown after conversion. The actual measured value and the display value are set to satisfy a linear relation, and the actual measured value is set into ten risk levels and corresponding colors of the defect in the roller. When the risk level value is 1.00 and the color is purple, a risk alarm of the roller is determined, and when the risk level value is 0.60 and the color is above light yellow, a roller risk pre-warning is determined. Once the working layer and binding layer of the roller is subjected to flaw detection by the flaw detector through the method, the amplitude of the detected wave is converted to form corresponding grades and colors. The grades and colors are defined, so that direct accurate determination of the defect in the roller is given, and the working performance is improved.
Description
Technical field
The present invention relates to a kind of method that airborne defectoscope breaker roll defect carries out the judgement of color progression.
Background technology
The roll of usual band steel production adopts the processes such as cast iron, cast steel or forged steel to make, and in the manufacture of roll with in using, the working lining of roller surface or binding layer produce the defect that can detect often.The detection technique of roller surface defect reaches its maturity, and conventional eddy current, magnetic or the flaw detection means such as painted find the defective locations of roll, and manifest shape and the feature of defect.Current employing UT (Ultrasonic Testing) is also ripe gradually, but cannot directly adopt naked eyes to carry out determining defects, and the shape of defect and feature also cannot manifest intuitively.
Roll, as the production workpiece of band steel, needs often to change maintenance, to recover the precision of roll, and the performance of guarantee band steel and quality.Nondestructive examination detection is carried out to the roll changed, ensures the security of work roll cooling exactly.
Ultra-sonic defect detector Cleaning Principle is ultrasonic pulse reflection method, and an electric signal launched by radiating circuit, and excitation ultrasonic transducer, by the back voltage effect of ultrasonic transducer, is the ultrasound wave of mechanical vibration and acoustic energy by electric energy conversion, and is coupled in test specimen to be checked.This ultrasound wave is in communication process, and all can produce reflection when running into bottom defect or test specimen to be checked, reflective sound wave is received by same ultrasonic transducer, by positive voltage effect, acoustic energy is converted into electric energy; This electric power signal is imported in follow-up signal treatment circuit and form reflected impulse signal through pre-service such as amplification, filtering, and show on video screen, just can intuitively from defect recognition echo video screen and end ripple signal, and according to the presence or absence of the position judgment defect of these flaw echos, size, position and character.
In ultra-sonic defect detector testing process, as shown in Figure 1, when workpiece 1 does not have defect, then probe 2 can only receive Bottom echo, so video screen only has beginning ripple T and end ripple B; As shown in Figure 2, when there being the defect 11 being less than acoustic beam cross section in workpiece 1, just defect waves F is there will be between beginning ripple T and end ripple B, the height of defect waves F is relevant with the size of defect, according to Equivalent method, flaw echo height is higher, defect 11 size is larger, and now, the height of Bottom echo B declines to some extent, this is because before ultrasound wave arrives bottom surface, some ultrasound wave is reflected back by defect 11, some ultrasonic energy has been decayed because of scattering, absorption etc. in workpiece 1; But, as shown in Figure 3, when the defect 12 in workpiece 1 is very large time, then the ultrasound wave of the overwhelming majority can be launched by defect 12 and go back, then the ultrasound wave arriving bottom surface is few, thus now end ripple hardly in fluorescence screen display.
It is high that Ultrasonic Detection has penetrance, and in many workpiece, penetrance size can reach several meters, axially can reach 6 meters; Applied range, can be used for the detection of metal, nonmetal and compound substance etc.; The thickness detected is large, highly sensitive, easy to operate; The directive property of sound wave is good, is convenient to the detection of complex-shaped workpieces; To determining that inherent vice character (size, position, orientation etc.) has comprehensive advantage.
When adopting ultra-sonic defect detector to carry out defects detection, there is protruding X-wave in the region that current probe points to, and along with the movement of probe, protruding waveform can move about or disappear.When waveform exceedes threshold value, represent that the region defectiveness that probe points to exists.But airborne defectoscope carries out carrying out flaw detection continuously, the testing result of breaker roll working lining or binding layer needs display and the judgement of carrying out defect, usually it depends on the display of detecting instrument and has the deciphering of certain experiences, directly perceived, correct judgement cannot be made to defect, affect the efficiency that roll defect detects.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of method that airborne defectoscope breaker roll defect carries out the judgement of color progression, this method is after defectoscope breaker roll working lining and binding layer are detected a flaw, the waveform wave amplitude detected is converted, form corresponding sum of series color, and sum of series color is defined, provide directly perceived, the correct judgement of roll defect, improve operating efficiency.
For solving the problems of the technologies described above, the method that the present invention's airborne defectoscope breaker roll defect carries out the judgement of color progression comprises the steps:
Step one, employing A type pulse reflection ultra-sonic defect detector breaker roll working lining and binding layer carry out carrying out flaw detection, the defect being greater than Ф 2 equivalent must not be there is in setting roll, sensitivity of tester is set as that primary reflection height adjustment is to all over the screen 60%, then improves 6dB as reference sensitivity;
Step 2, defectoscope adopt four groups of double-crystal normal probes, and using the height of ultrasound wave wave amplitude as evaluation index value, measured value is the echo values that conventional probe accepts, and the numerical value of display represents after conversion;
Step 3, setting measured value and displayed value meet following formula,
y=1.8x+0.1
In formula, y is displayed value, and x is measured value;
Step 4, y value is set as the risk progression of roll defect, and be defined as 0.10 grade, 0.20 grade, 0.30 grade, 0.40 grade, 0.50 grade, 0.60 grade, 0.70 grade, 0.80 grade, 0.90 grade and 1.00 grades respectively, the measured value that risk progression at different levels is corresponding is followed successively by 0.000,0.056,0.111,0.167,0.222,0.278,0.333,0.389,0.444,0.500 respectively;
Step 5, define color corresponding to risk progression at different levels and be followed successively by dark red, dark blue, indigo look, cyan, sea blue, pale yellow, yellow, pink, orange and purple, during roll defect carrying out flaw detection, the color displays of risk progression and correspondence is in the display screen of defectoscope;
Step 6, the deviate that the levels of risk numerical value 0.10 of measured value 0.000 correspondence is caused as airborne defectoscope environmental factor, using corresponding for measured value 0.500 levels of risk numerical value 1.00 as reference sensitivity value, reach levels of risk numerical value 1.00 and illustrate that roll is risky, the defect of roll will or have been expanded, now judge that roll blocks and can not have enough to meet the need use safely, levels of risk numerical value 1.00 and color are that purple is judged to be roll risk alert, and levels of risk numerical value 0.60 and color are light yellowly above be judged to be roll Risk-warning.
Further, the parameter of described double-crystal normal probe is wafer 15X5 millimeter, frequency 2.5MHz.
Further, the basic parameter of roll carrying out flaw detection is roll rotational speed 10 revs/min, its travel width 50 millimeters, UT (Ultrasonic Testing) speed <2.0m/s, roller diameter 680-600 millimeter.
The method of carrying out the judgement of color progression due to the present invention's airborne defectoscope breaker roll defect have employed technique scheme, and namely this method adopts ultra-sonic defect detector breaker roll working lining and binding layer carry out carrying out flaw detection and set reference sensitivity; Defectoscope is using the height of ultrasound wave wave amplitude as evaluation index value, and measured value is the echo values that conventional probe accepts, and the numerical value of display represents after conversion; Setting measured value and displayed value meet linear relationship; Measured value is set as the force 10 wind danger progression of roll defect and the color of correspondence; Levels of risk numerical value 1.00 and color are that purple is judged to be roll risk alert, and levels of risk numerical value 0.60 and color are light yellowly above be judged to be roll Risk-warning.This method is after defectoscope breaker roll working lining and binding layer are detected a flaw, the waveform wave amplitude detected is converted, forms corresponding sum of series color, and sum of series color is defined, provide directly perceived, the correct judgement of roll defect, improve operating efficiency.
Accompanying drawing explanation
Below in conjunction with drawings and embodiments, the present invention is described in further detail:
Fig. 1 is the waveform schematic diagram adopting ultra-sonic defect detector to detect zero defect workpiece and obtain;
Fig. 2 is the waveform schematic diagram adopting ultra-sonic defect detector to detect little defect workpiece and obtain;
Fig. 3 is the waveform schematic diagram adopting ultra-sonic defect detector to detect large defect workpiece and obtain;
Fig. 4 is the waveform character figure of roll shrinkage cavity defect;
Fig. 5 is the waveform character figure of roll incomplete fusion defect;
Fig. 6 is the waveform character figure of roll rift defect;
Fig. 7 is the waveform character figure of roll dreg defect;
Fig. 8 is the waveform character figure of roll gas hole defect.
Embodiment
The method that the present invention's airborne defectoscope breaker roll defect carries out the judgement of color progression comprises the steps:
Step one, employing A type pulse reflection ultra-sonic defect detector breaker roll working lining and binding layer carry out carrying out flaw detection, the defect being greater than Ф 2 equivalent must not be there is in setting roll, sensitivity of tester is set as that primary reflection height adjustment is to all over the screen 60%, then improves 6dB as reference sensitivity;
Step 2, defectoscope adopt four groups of double-crystal normal probes, and using the height of ultrasound wave wave amplitude as evaluation index value, measured value is the echo values that conventional probe accepts, and the numerical value of display represents after conversion;
Step 3, setting measured value and displayed value meet following formula,
y=1.8x+0.1
In formula, y is displayed value, and x is measured value;
Step 4, y value is set as the risk progression of roll defect, and be defined as 0.10 grade, 0.20 grade, 0.30 grade, 0.40 grade, 0.50 grade, 0.60 grade, 0.70 grade, 0.80 grade, 0.90 grade and 1.00 grades respectively, the measured value that risk progression at different levels is corresponding is followed successively by 0.000,0.056,0.111,0.167,0.222,0.278,0.333,0.389,0.444,0.500 respectively;
Step 5, define color corresponding to risk progression at different levels and be followed successively by dark red, dark blue, indigo look, cyan, sea blue, pale yellow, yellow, pink, orange and purple, during roll defect carrying out flaw detection, the color displays of risk progression and correspondence is in the display screen of defectoscope;
Step 6, the deviate that the levels of risk numerical value 0.10 of measured value 0.000 correspondence is caused as airborne defectoscope environmental factor, using corresponding for measured value 0.500 levels of risk numerical value 1.00 as reference sensitivity value, reach levels of risk numerical value 1.00 and illustrate that roll is risky, the defect of roll will or have been expanded, now judge that roll blocks and can not have enough to meet the need use safely, levels of risk numerical value 1.00 and color are that purple is judged to be roll risk alert, and levels of risk numerical value 0.60 and color are light yellowly above be judged to be roll Risk-warning.
Further, the parameter of described double-crystal normal probe is wafer 15X5 millimeter, frequency 2.5MHz.
Further, the basic parameter of roll carrying out flaw detection is roll rotational speed 10 revs/min, its travel width 50 millimeters, UT (Ultrasonic Testing) speed <2.0m/s, roller diameter 680-600 millimeter.
In the Ultrasonic Detection of roll defect, the echo that Ultrasonic Detection receives, can be different because the character, size, tendency, direction etc. of defect is different.Roll common deficiency is respectively the shrinkage cavity of metal, incomplete fusion, crack, slag inclusion and pore, and the Ultrasonic Detection wave f orm analysis of roll common deficiency is as follows,
(1) waveform character of shrinkage cavity: as shown in Figure 4, defect waves F is tall and big, also has slightly weak reflection wave in the front and back of defect waves F; When defect is larger, end ripple B decays serious or disappears; Multiple directions detection all can obtain defect waves F;
(2) waveform character of incomplete fusion: as shown in Figure 5, incomplete fusion defect waves F fixes position, when this blemish surface of sound wave vertical incidence, defect waves F is highly large, wave height >100%, defect waves F forward position is steep to be in line, and rear edge is in decline curve first quick and back slow;
(3) waveform character in crack: as shown in Figure 6, the inclusions of crack defect has gas to exist more, large with workpiece for measurement material acoustic resistance difference, make the defect waves F reflectivity of crackle high, and it is fast to play wave velocity, defect waves F forward position is precipitous, when wave beam is vertical with crack, defect waves F obviously, sharp-pointed, crest is precipitous, and decay is large, so end ripple B height <60%;
(4) waveform character of slag inclusion: as shown in Figure 7, the defect waves F position of slag inclusion is unstable, and waveform is disorderly, waveform accounts for roomy, plays wave velocity slow, and the change of defect waves F waveform is slower, reflectivity is low, little along slope after defect waves F, wave height >50%;
(5) waveform character of pore: as shown in Figure 8, pore is generally that air is not got rid of outside foundry goods in time in casting process, air bubble is defined in inside, Here it is gas hole defect, pore class defect is typical spheric reflection body, it is fast that defect waves F plays wave velocity, can find that its echo has the feature of spot defect when detecting near pore with probe, defect waves F waveform is sharp-pointed, precipitous, ripple root is clear, without development length, after probe is mobile, wave amplitude reduces until disappear very soon, this defect waves F wave amplitude is generally more than 60%, along almost symmetry before and after defect waves F, in A font, front and back are approximately 3 ~ 5 along slope.
Adopt this method breaker roll defect to detect, certain roll working life is about to arrive, and roll binding layer and the loose of marginal portion develop into defect waves gradually, detects send risk progression 1.00 and color is the risk alert of purple through this method.There is casting flaw in certain roll working lining, pit or pore etc. are under the effect of long-time alterante stress, there is reflection wave in blocks in working lining, and develop into risk progression 0.60 gradually and color is light yellow, this method judges that this roll is as Risk-warning rank, can carry out turning or grinding process, continues to use after removing pit or pore, also can follow the tracks of use 1 time, observe reflection wave and whether continue expansion.Certain roll has an accident in process of production, at barrel length 1600 millimeters place, there is strong reflection wave in working lining, the risk progression of this method be 0.90 and color be orange, higher than Risk-warning rank, evaluation result is that roll needs turning, thoroughly removes working lining defect and could recover to use.
The production efficiency of modern high precision output strip line is high.One day need of production changes the roll of 10 cover left and right, often props up roll and normally uses 1 ~ 3 time, must carry out carrying out flaw detection after each grinding of technological requirement roll, only has that carrying out flaw detection is qualified just can carry out turnover use.Therefore the frequency of roll carrying out flaw detection is high, Ultrasonic Detection wave f orm analysis according to roll common deficiency makes strongly professional flaw detection operation become simply in conjunction with this method, general detection operation efficiently, under the prerequisite guaranteeing roll carrying out flaw detection precision, greatly improve detection efficiency.The testing staff of usual roll flaw detection needs the professional qualification certificate possessing Non-Destructive Testing, after adopting this method, general operating personnel also can carry out preliminary judgement to flaw detection diagram, and the professional that detects a flaw only needs carry out multiple spy to the roll with Risk-warning and sentence eventually.
Claims (3)
1. airborne defectoscope breaker roll defect carries out a method for color progression judgement, it is characterized in that this method comprises the steps:
Step one, employing A type pulse reflection ultra-sonic defect detector breaker roll working lining and binding layer carry out carrying out flaw detection, the defect being greater than Ф 2 equivalent must not be there is in setting roll, sensitivity of tester is set as that primary reflection height adjustment is to all over the screen 60%, then improves 6dB as reference sensitivity;
Step 2, defectoscope adopt four groups of double-crystal normal probes, and using the height of ultrasound wave wave amplitude as evaluation index value, measured value is the echo values that conventional probe accepts, and the numerical value of display represents after conversion;
Step 3, setting measured value and displayed value meet following formula,
y=1.8x+0.1
In formula, y is displayed value, and x is measured value;
Step 4, y value is set as the risk progression of roll defect, and be defined as 0.10 grade, 0.20 grade, 0.30 grade, 0.40 grade, 0.50 grade, 0.60 grade, 0.70 grade, 0.80 grade, 0.90 grade and 1.00 grades respectively, the measured value that risk progression at different levels is corresponding is followed successively by 0.000,0.056,0.111,0.167,0.222,0.278,0.333,0.389,0.444,0.500 respectively;
Step 5, define color corresponding to risk progression at different levels and be followed successively by dark red, dark blue, indigo look, cyan, sea blue, pale yellow, yellow, pink, orange and purple, during roll defect carrying out flaw detection, the color displays of risk progression and correspondence is in the display screen of defectoscope;
Step 6, the deviate that the levels of risk numerical value 0.10 of measured value 0.000 correspondence is caused as airborne defectoscope environmental factor, using corresponding for measured value 0.500 levels of risk numerical value 1.00 as reference sensitivity value, reach levels of risk numerical value 1.00 and illustrate that roll is risky, the defect of roll will or have been expanded, now judge that roll blocks and can not have enough to meet the need use safely, levels of risk numerical value 1.00 and color are that purple is judged to be roll risk alert, and levels of risk numerical value 0.60 and color are light yellowly above be judged to be roll Risk-warning.
2. airborne defectoscope breaker roll defect according to claim 1 carries out the method for color progression judgement, it is characterized in that: the parameter of described double-crystal normal probe is wafer 15X5 millimeter, frequency 2.5MHz.
3. airborne defectoscope breaker roll defect according to claim 1 and 2 carries out the method for color progression judgement, it is characterized in that: the basic parameter of roll carrying out flaw detection is roll rotational speed 10 revs/min, its travel width 50 millimeters, UT (Ultrasonic Testing) speed <2.0m/s, roller diameter 680-600 millimeter.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111141820A (en) * | 2019-12-26 | 2020-05-12 | 中钢集团邢台机械轧辊有限公司 | Crack roller judging method |
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| CN102411029A (en) * | 2010-09-26 | 2012-04-11 | 宝山钢铁股份有限公司 | Method for examining steel tube defects through ultrasonic interference imaging |
| CN103616435A (en) * | 2013-12-02 | 2014-03-05 | 湖州市银鑫轧辊有限公司 | Roller defect detecting method |
| CN103782164A (en) * | 2011-06-23 | 2014-05-07 | 沙克拉德有限责任公司 | Apparatus and method for detecting defects in metallic surface |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| EP2251685A1 (en) * | 2009-05-15 | 2010-11-17 | intelligeNDT Systems & Services GmbH | Method and device for ultrasound inspection |
| CN102411029A (en) * | 2010-09-26 | 2012-04-11 | 宝山钢铁股份有限公司 | Method for examining steel tube defects through ultrasonic interference imaging |
| CN103782164A (en) * | 2011-06-23 | 2014-05-07 | 沙克拉德有限责任公司 | Apparatus and method for detecting defects in metallic surface |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111141820A (en) * | 2019-12-26 | 2020-05-12 | 中钢集团邢台机械轧辊有限公司 | Crack roller judging method |
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Address after: No. 3520 Tongji Road, Baoshan District, Shanghai, 201900 Patentee after: Baowu equipment Intelligent Technology Co., Ltd Address before: 201900, 335, Pu Pu Road, Shanghai, Baoshan District Patentee before: SHANGHAI BAOSTEEL INDUSTRY TECHNOLOGICAL SERVICE Co.,Ltd. |