CN105136902A - Hot rolled strip working roll combined layer ultrasonic testing method - Google Patents
Hot rolled strip working roll combined layer ultrasonic testing method Download PDFInfo
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- CN105136902A CN105136902A CN201510442092.3A CN201510442092A CN105136902A CN 105136902 A CN105136902 A CN 105136902A CN 201510442092 A CN201510442092 A CN 201510442092A CN 105136902 A CN105136902 A CN 105136902A
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Abstract
The invention discloses a hot rolled strip working roll combined layer ultrasonic testing method which includes following steps: (1) producing a test sample piece which is made from the same material as a to-be-test roller; (2) setting test thickness of the test sample piece, and testing the dB value when echo reaches full screen 100% under the test thickness and recording the dB value as A; (3) testing the center part of a roller body of the to-be-test roller, and recording the average value of dB in a position being excellent in combination in the zone as B, wherein the echo at the position reaches full screen 100%; (4) calculating D according to the formula D=(B-A)*0.3+A, wherein the D refers to the critical value when the maximum defect allowed to pass through reaches full screen; and (5) detecting any combined layer zone in the roller body of the to-be-test roller, when the reflected wave of the any combined layer zone reaches full screen, and the db value is higher than the D, determining that the to-be-test roller can be used further. The method employs a dynamic standard for determination, so that a determination standard is accurate and suitable.
Description
Technical field
The present invention relates to roll ultrasound examination field, specifically a kind of advanced person detects the hot rolled strip working roll binding layer ultrasonic detection method with brand-new Scientific Assessment.
Background technology
Current, the assessment method of all centrifugal compound roll binding layer metallurgical binding is flat-bottom hole test block Equivalent method, weigh with same test block, the standard of usual execution has: GB/T1503-2008 " cast steel roll " appendix A, GB/T1504-2008 " grain roll " appendix A, GB/T25825-2010 " hot-rolled steel strip roll " appendix A, and the specification requirement of its test block as shown in Figure 1 (unit is mm).The Cleaning Principle of this test block is utilized to be: test block is equivalent to the artificial 5mm defect manufactured, reflect equivalent by the equivalent size and this artificial defect detecting roll binding layer reflection wave to compare and determine Defect Equivalent, concrete operations are as follows: the first time echo of Ф 5 flat-bottom hole is adjusted to 80%f.s, as detection sensitivity.The material of reference block should be same or similar with detected roll, and outer material at the bottom of test surface to Ф 5 flat-bottom hole, position, flat-bottom hole place is core material, and the binding site of test block should weld well.When being adjusted to 80%f.s for the first time echo of USM-35 digital ultrasonic flaw detector: Ф 5 flat-bottom hole, dB value is 48dB, and our the unexpected defect waves when scanning roll is very high, and when dropping to 80%f.s, dB value is 44dB, and so the Defect Equivalent at this place is Ф 5+4dB.
Along with the continuous progress of complex technique and the development of detection technique, current this binding layer assessment method can not meet the development of prior art to a great extent, concrete limitation is as follows: (1), complex method kind are a lot, there are horizontal centrifugal, vertical centrifugal, tilting is centrifugal, because production technology is different, merge degree also different, must bring error with this kind of test block detection; (2), working lining (skin) original thickness mostly close to the outer field thickness of test block, testing result equivalent value is relatively accurate, and when skin of the roll uses a period of time or scrap the outer layer thickness of front roll very thin, this equivalent relative method will be inapplicable; (3), the manufacture difficulty of test block and require higher, the especially very difficult brill of core Ф 5mm flat-bottom hole, cost of manufacture is very high.
Summary of the invention
The object of the invention is for prior art Problems existing, a kind of hot rolled strip working roll binding layer ultrasonic detection method solving above-mentioned three problems is provided.
The object of the invention is to solve by the following technical programs:
A kind of hot rolled strip working roll binding layer ultrasonic detection method, is characterized in that: described ultrasonic detection method step is as follows:
(1) the detection test block consistent with detected roll material is made;
(2) select according to the working lining thickness of detected roll the test thickness detecting test block, detect and echo reaches all over the screen 100% under recording the test thickness of this detection test block time dB value, be designated as A, A is as assessed value that is minimum or theoretic complete layering;
(3) detect detected roll barrel central part region, reach the mean value of the dB value of all over the screen 100% in this region, be designated as B in conjunction with the echo of good position, B is as maximum assessed value and in conjunction with bad and detect test block value and compare;
(4) according to formula: D=(B-A) * 0.3+A assesses the quality of binding layer and large defect, wherein D be the greatest drawback that can allow to pass through all over the screen time critical value;
(5) detect the detected any binding layer region of roll barrel, when when any binding layer regional reflex ripple reaches all over the screen, db value is greater than D, then this detected roll can use further.
The concrete dimensional parameters of length, width and height of the detection test block in described step (1) is 70mm × 40mm × 20mm.
The standard of the test thickness detecting test block is selected to be according to the working lining thickness of detected roll in described step (2): to select to detect the length of test block when new roller uses as test thickness; Work roll cooling is to selecting the width detecting test block as test thickness during mid-term; Work roll cooling is to selecting the height detecting test block as test thickness during the later stage.
The present invention has the following advantages compared to existing technology:
The present invention contrasts object of reference with the while of detecting test block as detecting by often propping up detected roll, criterion is calculated by correlation formula relation, such criterion combines the process condition of this detected roll actual production, a dynamic standard in fact, namely its formula detecting criterion execution of different detected rolls is the same, but the result of criterion calculation is different, make this criterion more accurate and proper.
Accompanying drawing explanation
Accompanying drawing 1 is the structural representation detecting test block in prior art;
Accompanying drawing 2 adopts by ultrasonic detection method of the present invention the structural representation detecting test block.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is further illustrated.
As shown in Figure 2: a kind of hot rolled strip working roll binding layer ultrasonic detection method, this ultrasonic detection method step is as follows: (1) makes the detection test block consistent with detected roll material; (2) select according to the working lining thickness of detected roll the test thickness detecting test block, detect and echo reaches all over the screen 100% under recording the test thickness of this detection test block time dB value, be designated as A, A is as assessed value that is minimum or theoretic complete layering; (3) detect detected roll barrel central part region, reach the mean value of the dB value of all over the screen 100% in this region, be designated as B in conjunction with the echo of good position, B is as maximum assessed value and in conjunction with bad and detect test block value and compare; (4) according to formula: D=(B-A) * 0.3+A assesses the quality of binding layer and large defect, wherein D be the greatest drawback that can allow to pass through all over the screen time critical value; (5) detect the detected any binding layer region of roll barrel, when when any binding layer regional reflex ripple reaches all over the screen, db value is greater than D, then this detected roll can use further; And when db value is near or below D when any binding layer regional reflex ripple reaches all over the screen, check that detected roll is to determine whether this detected roll is applicable to using further further.During further restriction, in general, the concrete dimensional parameters of length, width and height of the detection test block in step (1) is 70mm × 40mm × 20mm; And in step (2), select the standard of the test thickness detecting test block to be according to the working lining thickness of detected roll: select to detect the length of test block when new roller uses as test thickness; Work roll cooling is to selecting the width detecting test block as test thickness during mid-term; Work roll cooling is to selecting the height detecting test block as test thickness during the later stage.When namely specifically using, generally take following scheme: select 70mm as test thickness when new roller uses, work roll cooling is to selecting 40mm as test thickness during mid-term, and work roll cooling is to selecting 20mm as test thickness during the later stage.
For such scheme for example, if when the A obtained in step (2) is 40dB, when being 68dB in conjunction with good zone leveling db value B in step (2), then allow the dB value D=48.6dB (all over the screen 100%) of the greatest drawback passed through, when when any binding layer regional reflex ripple in step (5) reaches all over the screen, db value is greater than 48.6dB, then this detected roll can use further; And any binding layer regional reflex ripple when reaching all over the screen dB value be near or below 48.6dB, carefully should check that the type, size, position etc. of detected roll are to determine whether this detected roll is applicable to using further.
The present invention contrasts object of reference with the while of detecting test block as detecting by often propping up detected roll, criterion is calculated by correlation formula relation, such criterion combines the process condition of this detected roll actual production, a dynamic standard in fact, namely its formula detecting criterion execution of different detected rolls is the same, but the result of criterion calculation is different, make this criterion more accurate and proper.
Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this, every technological thought proposed according to the present invention, and any change that technical scheme basis is done, all falls within scope; The technology that the present invention does not relate to all is realized by prior art.
Claims (3)
1. a hot rolled strip working roll binding layer ultrasonic detection method, is characterized in that: described ultrasonic detection method step is as follows:
(1) the detection test block consistent with detected roll material is made;
(2) select according to the working lining thickness of detected roll the test thickness detecting test block, detect and echo reaches all over the screen 100% under recording the test thickness of this detection test block time dB value, be designated as A, A is as assessed value that is minimum or theoretic complete layering;
(3) detect detected roll barrel central part region, reach the mean value of the dB value of all over the screen 100% in this region, be designated as B in conjunction with the echo of good position, B is as maximum assessed value and in conjunction with bad and detect test block value and compare;
(4) according to formula: D=(B-A) * 0.3+A assesses the quality of binding layer and large defect, wherein D be the greatest drawback that can allow to pass through all over the screen time critical value;
(5) detect the detected any binding layer region of roll barrel, when when any binding layer regional reflex ripple reaches all over the screen, db value is greater than D, then this detected roll can use further.
2. hot rolled strip working roll binding layer ultrasonic detection method according to claim 1, is characterized in that: the concrete dimensional parameters of length, width and height of the detection test block in described step (1) is 70mm × 40mm × 20mm.
3. hot rolled strip working roll binding layer ultrasonic detection method according to claim 1 and 2, is characterized in that: select the standard of the test thickness detecting test block to be according to the working lining thickness of detected roll in described step (2): to select to detect the length of test block when new roller uses as test thickness; Work roll cooling is to selecting the width detecting test block as test thickness during mid-term; Work roll cooling is to selecting the height detecting test block as test thickness during the later stage.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510442092.3A CN105136902B (en) | 2015-07-25 | 2015-07-25 | A kind of hot rolled strip working roll binder course ultrasonic detection method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510442092.3A CN105136902B (en) | 2015-07-25 | 2015-07-25 | A kind of hot rolled strip working roll binder course ultrasonic detection method |
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| CN105136902B CN105136902B (en) | 2017-12-22 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH102887A (en) * | 1996-06-14 | 1998-01-06 | Tokimec Inc | Method and apparatus for discriminating flaw in object to be inspected |
| JP3864180B2 (en) * | 2004-11-15 | 2006-12-27 | 独立行政法人 宇宙航空研究開発機構 | Ultrasonic test method and ultrasonic test apparatus used therefor |
| CN101813671A (en) * | 2010-05-06 | 2010-08-25 | 符丰 | Method for collecting surface wave and creeping wave of ultrasonic flaw detector |
| JP2014176872A (en) * | 2013-03-14 | 2014-09-25 | Honda Motor Co Ltd | Inspection method of spot welding |
-
2015
- 2015-07-25 CN CN201510442092.3A patent/CN105136902B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH102887A (en) * | 1996-06-14 | 1998-01-06 | Tokimec Inc | Method and apparatus for discriminating flaw in object to be inspected |
| JP3864180B2 (en) * | 2004-11-15 | 2006-12-27 | 独立行政法人 宇宙航空研究開発機構 | Ultrasonic test method and ultrasonic test apparatus used therefor |
| CN101813671A (en) * | 2010-05-06 | 2010-08-25 | 符丰 | Method for collecting surface wave and creeping wave of ultrasonic flaw detector |
| JP2014176872A (en) * | 2013-03-14 | 2014-09-25 | Honda Motor Co Ltd | Inspection method of spot welding |
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| CN105136902B (en) | 2017-12-22 |
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