CN101368931B - On-service supersonic flaw detection method of heavy and medium plate mill roller - Google Patents
On-service supersonic flaw detection method of heavy and medium plate mill roller Download PDFInfo
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- CN101368931B CN101368931B CN2008101414988A CN200810141498A CN101368931B CN 101368931 B CN101368931 B CN 101368931B CN 2008101414988 A CN2008101414988 A CN 2008101414988A CN 200810141498 A CN200810141498 A CN 200810141498A CN 101368931 B CN101368931 B CN 101368931B
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Abstract
The invention relates to an in-service ultrasonic flaw detection method for medium plate mill rolls, belonging to the non-destructive detection technical field. The flaw detection method adopts the single-crystal and bi-crystal straight probe combining ultrasonic roll to detect the flaw and adjust the sensitivity through a fai-2 flat-bottom hole test block. The in-service ultrasonic flaw detection method for rolls has higher flaw detection sensitivity and can timely detect the smallest flaw under a higher sensitivity and timely grip the flaw generation occasion so as to analyze the causes and develop corresponding countermeasures or schemes according to the nature of the flaw; the invention can also adjust the roll matching program, reduce the flaw expansion speed and improve the service life of rolls; at the same time, the flaw detection method causes no environmental pollution and has low cost and high flaw detection accuracy.
Description
(1) technical field
The present invention relates to a kind of heavy and medium plate mill roll in the service supersonic method of detection, belong to technical field of nondestructive testing.
(2) background technology
Detect a flaw for the milling train pressure roller at present, be since rolling mill roll in use regular meeting is because roll volume of the circular flow deficiency causes the roll dressing amount of every day quite big, in order to guarantee roll quality, the roll after every grinding all needs flaw detection.Existing roll method of detection is with single normal probe contact method flaw detection, uses machine oil as couplant.The weakness of this way is: (1) can not in time find defective and defective expansion trend; (2) can not in time adopt remedial measures, to delay the defective expansion rate; (3) the testing layer thickness is 20mm during with bottom roll, influenced by ultrasonic near field, and the blind area is bigger, and the flaw detection accuracy rate is low, easily omission or flase drop.
(3) summary of the invention
The object of the present invention is to provide a kind of heavy and medium plate mill roll in the service supersonic method of detection, can separate must not in time find roll defect and the expansion trend problem; And further solve when the testing layer thickness be 20mm during with bottom roll, the blind area is big, the problem of detect a flaw low, easy omission of accuracy rate or flase drop.
The technical solution used in the present invention is as follows:
A kind of heavy and medium plate mill roll in the service supersonic method of detection, take the ultrasound wave roll flaw detection that monocrystalline, double-crystal normal probe combine, adjust sensitivity with φ 2 flat-bottom hole test blocks.
The sensitivity adjustment scope of straight probe of single crystal is φ 2～φ 2-12dB; The sensitivity adjustment scope of double-crystal normal probe is φ 2～φ 2-14dB.
Adopt high sensitivity straight probe of single crystal UT (Ultrasonic Testing) to find that nearly top layer defectiveness ripple exists and can't judge defect size and character the time, adopt the double crystal probe flaw detection,, cause erroneous judgement and influence result of detection to eliminate influence because of the nearly surperficial blind area of single crystal probe.
When working lining thickness during greater than 20mm, adopt the flaw detection of high sensitivity straight probe of single crystal, initial sensitivity is adjusted into φ 2-12dB; When working lining thickness during less than 20mm, adopt the high sensitivity double-crystal normal probe to survey, initial sensitivity is adjusted into φ 2-14dB.
Couplant during flaw detection is an emulsion, and described emulsion is the potpourri of kerosene and water, and wherein the mass percent of kerosene and water example is 10-30%:70-90%.Adopt this couplant, with respect to machine oil, emulsify well, and pollute little, environmental protection.Also therefore, this method of detection cost is low; Because coupling layer thickness is corresponding thinner, acoustical energy losses is little during flaw detection, result of detection accuracy height in addition.
Because common single-chip normal probe UT (Ultrasonic Testing) just as the monitoring flaw detection, is not surveyed long line as long as the Defect Equivalent size reaches, and is not generally paid attention to.Therefore only adopt the straight probe of single crystal UT (Ultrasonic Testing), it is the development trend that in time to find smaller defect and defective, after using the combination of double-crystal normal probe ultrasonic inspection, just can find the defective that some single normal probes can't find timely, thereby in time find defective, work out corresponding counter-measure, improve the serviceable life of roll.After using double-crystal normal probe flaw detection combination in addition,, avoided the near field region interference, can in time find defective the roll of working lining thickness less than 20mm.In the flaw detection process, along with defective expansion, desensitization gradually; When the Defect Equivalent diameter reaches Φ 5mm when above, redefine the operational version of roll.
What this patent adopted is highly sensitive dynamic instrumentation method.Can on grinding machine, detect a flaw in the rotary course in roll.Purpose is to monitor generation of defects opportunity, grasps its variation tendency, so that work out the method for control defective expansion rate, prolongs the roll purpose in serviceable life thereby reach.In addition for new roll, the standard that detects is all lower because general roll dispatches from the factory, and therefore adopts the inventive method also can be in time the defective of new roll to be had a understanding clearly.Adopt the method for detection and the sensitivity of the single two probe incorporated of the present invention, can detect the defective of equivalent diameter below 1mm basically.
With respect to prior art, the invention has the advantages that:
Roll of the present invention in the service supersonic method of detection, flaw detection sensitivity is higher, under higher sensitivity, can in time elicite minimum defective, in time grasps the opportunity that defective produces, and according to defect property, analyzes reason, works out Corresponding Countermeasures or scheme; Adjust roll pairing scheme, reduce the defective expansion rate, improve the serviceable life of roll; This method of detection simultaneously can not pollute environment, and cost is low, result of detection accuracy height.
(4) embodiment:
Below with specific embodiment technical scheme of the present invention is described, but protection scope of the present invention is not limited thereto:
Embodiment 1
After new roll enters factory, because through detecting a flaw with Φ 5 flat-bottom hole test blocks, the dangerous defective of short of discovery Φ 5 above equivalents, just be considered as qualified roll, but the voucher that can not how to use as roll, must survey it this moment with higher sensitivity, and defectiveness exists, defect property, defect size and defective locations to be to determine the concrete operational version of this roll.The W-24 roll, after unpacking, do not find defect waves when adopting machine oil as couplant, and when grinding machine, employing kerosene and quality ratio are that the mix emulsion fluid of 30:70 is made couplant, in conjunction with detecting a flaw, find to have Φ 2-12～14dB defect waves with single double-crystal normal probe, according to defect waves present position and waveform, can determine that this roll only uses as lower roll.
Embodiment 2
W-24 roll, roller diameter originally are 990mm, after use a period of time, roller diameter is 970mm, in conjunction with flaw detection, finds that defective has expanded to the multiple spot defect waves of equivalent diameter Φ 5mm by the single double-crystal normal probe of high sensitivity, can reduce flaw detection sensitivity this moment, and proceed monitoring.Used couplant be kerosene with quality than being the mix emulsion fluid of 20:80.
Embodiment 3
Adopt single double-crystal normal probe to combine and carry out UT (Ultrasonic Testing) monitoring W-34 roll, find to detect a flaw with the sensitivity of Φ 2-12～14dB, detect when roller diameter is used 970mm by 990mm, begin to occur the single-point defect waves that Φ 2-12～14dB wave height is standard code (100%) all over the screen.To adopt couplant be kerosene with quality than being the mix emulsion fluid of 10:90.
Claims (3)
- A heavy and medium plate mill roll in the service supersonic method of detection, the ultrasound wave roll flaw detection that it is characterized in that taking monocrystalline, double-crystal normal probe to combine is adjusted sensitivity with φ 2 flat-bottom hole test blocks; When working lining thickness during greater than 20mm, adopt the flaw detection of high sensitivity straight probe of single crystal, initial sensitivity is adjusted into φ 2-12dB; When working lining thickness during less than 20mm, adopt the high sensitivity double-crystal normal probe to survey, initial sensitivity is adjusted into φ 2-14dB; Couplant during flaw detection is an emulsion, and described emulsion is the potpourri of kerosene and water, and wherein the mass percent of kerosene and water example is 10-30%: 70-90%.
- 2. heavy and medium plate mill roll as claimed in claim 1 in the service supersonic method of detection, the sensitivity adjustment scope that it is characterized in that straight probe of single crystal is φ 2～φ 2-12dB; The sensitivity adjustment scope of double-crystal normal probe is φ 2～φ 2-14dB.
- 3. heavy and medium plate mill roll as claimed in claim 1 or 2 in the service supersonic method of detection, it is characterized in that adopting high sensitivity straight probe of single crystal UT (Ultrasonic Testing) to find that nearly top layer defectiveness ripple exists and can't judge defect size and character the time, adopt the double crystal probe flaw detection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101414988A CN101368931B (en) | 2008-09-28 | 2008-09-28 | On-service supersonic flaw detection method of heavy and medium plate mill roller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101414988A CN101368931B (en) | 2008-09-28 | 2008-09-28 | On-service supersonic flaw detection method of heavy and medium plate mill roller |
Publications (2)
| Publication Number | Publication Date |
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| CN101368931A CN101368931A (en) | 2009-02-18 |
| CN101368931B true CN101368931B (en) | 2011-05-04 |
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| CN2008101414988A Expired - Fee Related CN101368931B (en) | 2008-09-28 | 2008-09-28 | On-service supersonic flaw detection method of heavy and medium plate mill roller |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103926311A (en) * | 2013-01-15 | 2014-07-16 | 宝山钢铁股份有限公司 | Ultrasonic detecting method for microscopic cracks of roller surface layer |
| CN103293226B (en) * | 2013-06-27 | 2016-03-09 | 济钢集团有限公司 | A kind of method utilizing single crystal probe determination steel plate inspection reference sensitivity |
| CN104502462B (en) * | 2014-12-26 | 2017-06-16 | 四川曜诚无损检测技术有限公司 | For drill pipe thickening area and the ultrasonic wave on-line checking defect-detecting equipment of friction welding seam |
| CN104634874B (en) * | 2015-02-06 | 2018-08-24 | 宝钢轧辊科技有限责任公司 | Large forged back -up roll body of roll working lining defect inspection method |
| CN106290570A (en) * | 2016-08-30 | 2017-01-04 | 江苏共昌轧辊股份有限公司 | A kind of ultrasonic detection method casting BD roller |
| CN106645411B (en) * | 2017-01-09 | 2019-08-20 | 山东钢铁集团日照有限公司 | A kind of full-scale non-blind area failure detector of cut deal and method |
| CN112147223A (en) * | 2020-10-14 | 2020-12-29 | 首钢京唐钢铁联合有限责任公司 | Method for detecting internal defects of casting blank |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201096754Y (en) * | 2007-10-19 | 2008-08-06 | 无锡拓谷科技有限公司 | Adjustable ultrasonic combined probe |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201096754Y (en) * | 2007-10-19 | 2008-08-06 | 无锡拓谷科技有限公司 | Adjustable ultrasonic combined probe |
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