CN102095801A - System and method for quickly and accurately detecting inclusion in casting blank - Google Patents
System and method for quickly and accurately detecting inclusion in casting blank Download PDFInfo
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- CN102095801A CN102095801A CN 201110030715 CN201110030715A CN102095801A CN 102095801 A CN102095801 A CN 102095801A CN 201110030715 CN201110030715 CN 201110030715 CN 201110030715 A CN201110030715 A CN 201110030715A CN 102095801 A CN102095801 A CN 102095801A
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Abstract
The invention provides a system and a method for quickly and accurately detecting inclusion in a casting blank, and belongs to the technical field of steel-making detection. The system comprises a phased array ultrasonoscope system, a scanning movement control system and a data processing system which are connected with one another sequentially to form an information channel of a loop. Compared with the traditional detection method, the method has the advantages that: the frequency of a probe of the ultrasonic phased array, which is used by the improved method, is 1 to 15MHz, and the resolution precision can totally meet the detection requirement. In the ultrasonic phased array detection, a three-dimensional view of B scanning, C scanning and D scanning are provided, and inclusion which cannot be recognized by C scanning and which are overlapped in the thickness direction of test samples; moreover, the probe of the ultrasonic phased array has a large wafer amount, and is high in scanning speed and low in time consumption. By the novel mannesmann inclusion detection by analyzing surfboards (MIDAS) method, the efficiency of detecting the inclusion in the casting blank is improved greatly, and the analysis precision is enhanced simultaneously.
Description
Technical field
The invention belongs to steel-making detection technique field, a kind of system and method thereof that quick and precisely detects snotter in the strand particularly is provided, be applicable to the analysis that snotter distributes in the continuous casting billet.
Background technology
The check and analysis that the medium-and-large-sized snotter of strand distributes are difficult problems of steel industry.Although it is large-scale The amount of inclusions is less, the most direct and obvious to the harm of steel product quality.For example, cold rolling too much with the large-scale snotter near the top layer in the plate strand, finally will produce problems such as hole and peeling on the cold-reduced sheet surface; Large-scale snotter will become the originating point of fatigue break micro-crack when spring steel uses.But detecting the medium-and-large-sized snotter distribution of strand is the prerequisite that realizes large-scale Control and Inclusion Removal.
Conventional method finds that the granule snotter is not difficult, can pass through methods analysts such as optical microscope, scanning electron microscope.And large-scale The amount of inclusions is few, the distribution in strand more at random, be difficult to characterize accurately what of large-scale snotter with the two-dimensional surface analytical approach.
The MIDAS method is one of the present medium-and-large-sized snotter volume of more effective strand detection method.The principle of this method is based in the strand snotter also assembles on certain space to some extent, and rolling back snotter is elongated, broaden, and has eliminated the influence of bubble and the thick generation of crystal grain in the strand, is easy to ultrasound examination.And can analyze the blank surface impurities accumulation zone.
It all is the conventional ultrasound probe that tradition MIDAS analysis is adopted, and its disadvantage is that sweep time is long, and motion control device breaks down easily.Conventional transducer need be contained on the specific scanning motion control device, and sample is lined by line scan, and the stepping of every row is little, has only 0.1mm, and need a few hours the sweep time altogether of a sample board.
Summary of the invention
The object of the present invention is to provide a kind of system and method thereof that quick and precisely detects snotter in the strand, it is long to have solved sweep time, the problem that motion control device breaks down easily and stepping is little.Be used for the detection that the medium-and-large-sized snotter of strands such as slab, square billet, rectangular bloom distributes.Concrete feature is to adopt ultrasonic phased array technology, designed snotter detection method in the new strand, by detection signal post-processed function, can provide the distribution of large-scale snotter in slab, be greatly improved for large-scale snotter detection efficiency and accuracy in the slab.
The present invention has designed the detection system that snotter distributes in the strand shown in Figure 1 according to the principle that MIDAS detects.This system comprises phased array supersonic instrument system, scanning kinetic control system and data handling system composition, and phased array supersonic instrument system, scanning kinetic control system are connected successively with data handling system, form the information channel of a loop.Scanning probe movement control system control phased array probe is opposite to the sample board in the tank, and (direction shown in arrow among the figure) comes flyback retrace up and down line by line.Then signal is passed to the phased array supersonic instrument system, by data handling system these scan-datas are carried out aftertreatment at last, the distribution and the quantity of snotter in the analytical sample.According to the ratio of sample board diverse location rolled elongated, the distribution of snotter on strand in the inverse sample board.
Detection method of the present invention is:
Between 1000 ℃～1200 ℃, the strand sample is prolonged 5 times, base cross direction according to the thick direction of: base, and to prolong 2 times principle rolling, cools off in rolling the ends back immersion water.After being cooled to 20～30 ℃ sample is placed tank, start phased array supersonic instrument system and probe movement control system, by lining by line scan of probe, the snotter that obtains each position in the sample board distributes, and final phased array supersonic instrument system can generate the distribution plan of snotter in the sample board.The log-on data disposal system is analyzed testing result, can obtain quantity, the distribution of large-scale snotter in the sample board, thereby can judge the grade of large-scale snotter.
This method is applied to ultrasonic phase array in the MIDAS analytical approach of snotter in the strand.At first, the used frequency probe of conventional MIDAS inclusion analysis method is generally at 4～10MHz, and the ultrasonic phase array frequency probe is between 1～15MHz, and resolving accuracy satisfies the detection demand fully.Secondly, ultrasonic phase array detects and provides B scanning, C scanning, D scanning three-dimensional view (as shown in Figure 4), can tell C and scan the overlapping snotter of differentiating not come out.The 3rd, ultrasonic phase array probe number of wafers is many, and Scanning speed is fast, and is consuming time few.The 4th, easy to operate, can manual scanning, also probe can be contained on the scanning motion control device.
This system can be used for detection plane type metal works, detect workpiece inside pore, be mingled with and metal in have particulate contamination.Can quantitative detection to hole, level land or the defective of metal interior diameter 0.1mm.Can distribute and content according to the snotter more than the echoed signal Treatment Analysis 150 μ m (polymerization be mingled with and roll up slag large-scale being mingled with such as be mingled with), further judge the cleanliness factor of continuous casting billet.
Description of drawings
Fig. 1 improves the MIDAS detection system for the slab snotter.
Fig. 2 is MIDAS slab sampling synoptic diagram.
Fig. 3 is a MIDAS sample hot-rolling method synoptic diagram.
Fig. 4 is the local ultrasonic phase array scintigram of MIDAS sample.
Fig. 5 is a MIDAS sample defect map.
Embodiment
Embodiment
Sampling method is got the sample of certain size as shown in Figure 1 at the Width of slab.General specimen size is 160mm (base is wide) * 230mm (base is thick) * 130mm (base is long).As shown in Figure 2 sample is rolled then.Prolong 2 times at 5 times of 1050 ℃ of thick directions prolongations of rolling back sample base, base cross direction.Snotter in the strand also can correspondingly deform, and the deformation situation of changeability snotter is as shown in table 1.
The rolling back of table 1 snotter deformation extent
| The casting direction | Width | Thickness direction | |
| Strand sample size, mm | 130 | 160 | 230 |
| Elongation/compression factor | 10 | 2 | 5 |
| Sample after the hot rolling, mm | 13 | 320 | 1150 |
| Snotter original size in the slab, μ m | 50 | 50 | 50 |
| Rolling back snotter size, μ m | 5 | 100 | 250 |
Use the experiment steel plate of new equipment after to the hot rolling of MIDAS method and detect, the detection system major parameter is as shown in table 2.Probe acoustic beam effective coverage range is 25mm, considers that acoustic beam covers, and carries out scanning with every capable 20mm.Probe is placed place in the middle of the test specimen, is reference with end ripple, with end wave-wave to a high-profile to 200%, as Scanning sensitivity; Ripple is a benchmark at the bottom of the also available CB1 test block 6mm, and end ripple is transferred to 50%, adds 10dB again, and as reference sensitivity, because specimen surface is comparatively coarse, Scanning sensitivity should be: reference sensitivity+6dB.Therefore two kinds of sensitivity adjusting are respectively 31dB, 32dB.
Table 2 major equipment parameter
| Title | Device description |
| Omniscan?16/28 | The ultrasonic data acquisition imaging device of phased array function |
| 10L64-I1 | Frequency 10Mhz, the phased array probe of 64 linear array wafers |
| The SI1-0L voussoir | The 0 degree compressional wave voussoir that is used with 64 wafer phased array probes of 10Mhz |
| Miniature scrambler | Be used for writing down the position of scanning direction |
Fig. 4 is the local ultrasonic phase array scintigram of MIDAS sample, among the figure 4 images by from left to right, from top to bottom order is respectively A, B, four scan images of C, D, A sweep has reflected the power of snotter signal, C scanning has reflected that the face that is mingled with distributes, B and D scan image have reflected the degree of depth of snotter, the snotter of stack just can accurately make a distinction by B and D scanning in the C scanning like this, and the statistical magnitude of snotter number is also just more accurate.
By defective in each row scanning picture is carried out analytic statistics, obtain of the distribution of MIDAS sample board snotter, as shown in Figure 5 in sheet material inside.Just can carry out qualitative assessment according to The amount of inclusions, and can calculate large-scale snotter and in slab, distribute slab macroscopic view cleanliness factor.
Claims (2)
1. a system that quick and precisely detects snotter in the strand is characterized in that, comprises phased array supersonic instrument system, scanning kinetic control system and data handling system composition; Phased array supersonic instrument system, scanning kinetic control system are connected successively with data handling system, form the information channel of a loop; Scanning probe movement control system control phased array probe is opposite to the sample board in the tank, comes flyback retrace up and down line by line; Then signal is passed to the phased array supersonic instrument system, by data handling system these scan-datas are carried out aftertreatment at last, the distribution and the quantity of snotter in the analytical sample.According to the ratio of sample board diverse location rolled elongated, the distribution of snotter on strand in the inverse sample board.
2. method that adopts the described system of claim 1 quick and precisely to detect snotter in the strand, it is characterized in that, between 1000 ℃～1200 ℃, the strand sample is prolonged 5 times, base cross direction according to the thick direction of: base, and to prolong 2 times principle rolling, cools off in rolling the ends back immersion water; After being cooled to 20～30 ℃ sample is placed tank, start phased array supersonic instrument system and probe movement control system, by lining by line scan of probe, the snotter that obtains each position in the sample board distributes, and final phased array supersonic instrument system can generate the distribution plan of snotter in the sample board; The log-on data disposal system is analyzed testing result, obtains quantity, the distribution of large-scale snotter in the sample board, thereby judges the grade of large-scale snotter.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102495133A (en) * | 2011-12-12 | 2012-06-13 | 北京科技大学 | Quantitative analysis method for distribution of large impurities in casting blank |
| CN103592368A (en) * | 2013-11-13 | 2014-02-19 | 中国航空工业集团公司北京航空材料研究院 | Water immersion ultrasonic phased-array detection device and detection method of disc part of aero-engine |
| CN104730148A (en) * | 2015-03-30 | 2015-06-24 | 北京科技大学 | Metal material inner inclusion three-dimensional reconstruction method based on ultrasonic testing technology |
| CN105319270A (en) * | 2015-10-16 | 2016-02-10 | 西宁特殊钢股份有限公司 | Detection device and method for large-particle occluded foreign substances in steel |
| CN106198740A (en) * | 2016-07-13 | 2016-12-07 | 大连理工大学 | A kind of weld joint automatized phased array ultrasonic detecting method of Nuclear power plant main pipeline |
| CN108226303A (en) * | 2017-12-07 | 2018-06-29 | 中国船舶重工集团公司第七二五研究所 | A kind of dissimilar steel electron beam weld ultrasound detection test block and detection method |
| CN111829808A (en) * | 2020-06-15 | 2020-10-27 | 包头钢铁（集团）有限责任公司 | Sampling method for analyzing content of rare earth inclusions in steel casting blank |
| CN115255304A (en) * | 2022-06-14 | 2022-11-01 | 江阴兴澄特种钢铁有限公司 | Continuous casting method for controlling macroscopic inclusions in steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102495133A (en) * | 2011-12-12 | 2012-06-13 | 北京科技大学 | Quantitative analysis method for distribution of large impurities in casting blank |
| CN103592368A (en) * | 2013-11-13 | 2014-02-19 | 中国航空工业集团公司北京航空材料研究院 | Water immersion ultrasonic phased-array detection device and detection method of disc part of aero-engine |
| CN104730148A (en) * | 2015-03-30 | 2015-06-24 | 北京科技大学 | Metal material inner inclusion three-dimensional reconstruction method based on ultrasonic testing technology |
| CN104730148B (en) * | 2015-03-30 | 2018-10-02 | 北京科技大学 | Metal material inner clamps sundries three-dimensional reconstruction method based on ultrasonic detecting technology |
| CN105319270A (en) * | 2015-10-16 | 2016-02-10 | 西宁特殊钢股份有限公司 | Detection device and method for large-particle occluded foreign substances in steel |
| CN106198740A (en) * | 2016-07-13 | 2016-12-07 | 大连理工大学 | A kind of weld joint automatized phased array ultrasonic detecting method of Nuclear power plant main pipeline |
| CN108226303A (en) * | 2017-12-07 | 2018-06-29 | 中国船舶重工集团公司第七二五研究所 | A kind of dissimilar steel electron beam weld ultrasound detection test block and detection method |
| CN111829808A (en) * | 2020-06-15 | 2020-10-27 | 包头钢铁（集团）有限责任公司 | Sampling method for analyzing content of rare earth inclusions in steel casting blank |
| CN115255304A (en) * | 2022-06-14 | 2022-11-01 | 江阴兴澄特种钢铁有限公司 | Continuous casting method for controlling macroscopic inclusions in steel |
| CN115255304B (en) * | 2022-06-14 | 2023-10-10 | 江阴兴澄特种钢铁有限公司 | Continuous casting method for controlling macroscopic inclusion in steel |
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Application publication date: 20110615 |