SE516072C2 - Ways of measuring the movement of an object by means of a whirlpool sensor - Google Patents
Ways of measuring the movement of an object by means of a whirlpool sensorInfo
- Publication number
- SE516072C2 SE516072C2 SE0001060A SE0001060A SE516072C2 SE 516072 C2 SE516072 C2 SE 516072C2 SE 0001060 A SE0001060 A SE 0001060A SE 0001060 A SE0001060 A SE 0001060A SE 516072 C2 SE516072 C2 SE 516072C2
- Authority
- SE
- Sweden
- Prior art keywords
- movement
- sweep
- mold
- sweeps
- string
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/64—Devices characterised by the determination of the time taken to traverse a fixed distance
- G01P3/80—Devices characterised by the determination of the time taken to traverse a fixed distance using auto-correlation or cross-correlation detection means
- G01P3/803—Devices characterised by the determination of the time taken to traverse a fixed distance using auto-correlation or cross-correlation detection means in devices of the type to be classified in G01P3/66
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/28—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring contours or curvatures
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
Description
:oh-n 516 uø~ . : oh-n 516 uø ~.
Uppfinningen ska beskrivas använd för mätning på ett stålämne, ett slab, som stränggjuts i en i båda ändar öppen vattenkyld kokill i vars övre del flytande stål tillförs och ämnet som har stelnat skal dras kontinuerligt ut vertikalt nedåt ur kokillen. Kokillen oscilleras i sin längdriktning med en frekvens på 1-2 Hz. l figur 1 visas ämnet 11 och dess rörelseriktning anges med en pil. Kokillen och gjutanordningen visas inte eftersom det rör sig om konventionell teknik som återfinns på internationella patentklassen B22D-011l04. Under kokillen finns en bågformad kylkammare som kan vara ungefär 10 m lång och kyler strängen med vatten. Strängen böjs av och blir horisontell före en kapstation. En virvelströmsgivare 12 monteras beröringsfritt men tätt intill ämnet antingen i kylsträckan eller efter kylsträckan. Virvelströmsgivaren är anordnad att svepa fram och åter en bestämd sträcka i ämnets längdriktning. Den mekaniska anordningen för att utföra rörelsen visas inte. Alternativt till en mekanisk rörelse kan man ha en givare som är mekaniskt orörlig, men som har ett svepande magnetfält; i båda fallen kan man anse att givaren sveper. Virvelströmsgivaren 12 är kopplad till en elektronikbox 13 med styrsystem för givaren och elektronikboxen 13 är kopplad till en dator 14, exempelvis en vanlig PC som har analysmjukvara. Givaren12 och elektronikboxen 13 kan erhållas från specialistföretag och beskrives inte närmare.The invention is to be described as used for measuring a steel blank, a slab, which is extruded into a water-cooled mold at both ends in which the upper part fl surface steel is supplied and the blank which has solidified is continuously drawn vertically downwards out of the mold. The mold oscillates in its longitudinal direction with a frequency of 1-2 Hz. Figure 1 shows the subject 11 and its direction of movement is indicated by an arrow. The mold and the casting device are not shown as these are conventional techniques found in international patent class B22D-011104. Under the mold there is an arcuate cooling chamber that can be about 10 m long and cools the string with water. The string bends off and becomes horizontal before a cutting station. An eddy current sensor 12 is mounted contactlessly but close to the blank either in the cooling section or after the cooling section. The eddy current sensor is arranged to sweep back and forth a certain distance in the longitudinal direction of the blank. The mechanical device for performing the movement is not shown. As an alternative to a mechanical movement, one can have a sensor which is mechanically immobile, but which has a sweeping magnetic field; in both cases it can be considered that the sensor sweeps. The eddy current sensor 12 is connected to an electronics box 13 with control system for the sensor and the electronics box 13 is connected to a computer 14, for example an ordinary PC which has analysis software. The sensor 12 and the electronics box 13 can be obtained from specialist companies and are not described in more detail.
De används konventionellt för sprickindikering.They are conventionally used for crack indication.
När givaren 11 gör ett svep erhålls en signal som återger yttopografin och materialegenskaper, exv slagginneslutningar, nära ytan. l figur 2 visas ett exempel på en signal där signalen återges på ordinatan och sveplängden på abskissan.When the sensor 11 makes a sweep, a signal is obtained which reproduces the surface topography and material properties, eg slag inclusions, close to the surface. Figure 2 shows an example of a signal where the signal is reproduced on the ordinate and the scan length on the abscissa.
Figur 3 återger signalen för svepet före. Med vanlig korrelationsanalys räknar datorn fram den sträcka som ytan, dvs ämnet 11 har förflyttat sig mellan svepen.Figure 3 shows the signal for the sweep before. With standard correlation analysis, the computer calculates the distance that the surface, ie the blank 11, has moved between the sweeps.
Eftersom man vet tiden mellan svepen får man också hastigheten för förflyttningen. Man måste anpassa sveplängd och svepfrekvens till beräknad gjuthastighet så att man får en tillräcklig lång omlottsträcka för att få en säker korrelationsanalys. Man kan mäta i ena riktningen, antingen med eller motsatt gjutriktningen, eller mäta i båda riktningarna a»>»: (ri al» cr. c» NI 'l .uu . 3 Om svepfrekvensen är avsevärt större än kokillens oscillationsfrekvens, exempelvis 10 ggr större, indikeras även eventuell oscillation som är överlagrad ämnets rörelse. Variation i ämnets oscillation beror på variation i friktion mellan ämne och kokill Stor friktion betyder att stora krafter induceras i strängskalet så att risken för sprickbildning ökar. Man kan således genom den beskrivna mätningen och med ett enkelt datorprogram förutsäga risken för sprickbildning, vilket är av utomordentlig vikt för kvalitetssäkringen och kan spara stora kostnader i senare produktionssteg, i första hand i valsningsprocessen. För att få så noggrann mätning av oscillationen som möjligt bör virvelströmsgivaren vara placerad nära kokillen och en virvelströmsmätare kan göras så robust att den klarar den miljön.Since you know the time between sweeps, you also get the speed of the movement. You must adjust the sweep length and sweep frequency to the calculated casting speed so that you get a sufficiently long wrap distance to get a reliable correlation analysis. One can measure in one direction, either with or opposite the casting direction, or measure in both directions a »>»: (ri al »cr. C» NI 'l .uu. 3 If the sweep frequency is considerably greater than the oscillation frequency of the mold, for example 10 times greater, also indicates any oscillation that is superimposed on the motion of the substance.Variation in the oscillation of the substance is due to variation in friction between substance and mold Large friction means that large forces are induced in the string shell so that the risk of crack formation increases. a simple computer program predicts the risk of cracking, which is of paramount importance for quality assurance and can save large costs in later production stages, primarily in the rolling process.To get as accurate measurement of the oscillation as possible, the eddy current sensor should be located near the mold and an eddy current meter can be made so robust that it can withstand that environment.
Mätningssättet är ovan beskrivet för mätning vid stränggjutning, men det kan användas även i andra sammanhang. Det är som ovan beskrivits särskilt lämpat för svåra miljöer.The measurement method is described above for measurement during continuous casting, but it can also be used in other contexts. As described above, it is particularly suitable for difficult environments.
Claims (1)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE0001060A SE516072C2 (en) | 2000-03-27 | 2000-03-27 | Ways of measuring the movement of an object by means of a whirlpool sensor |
PCT/SE2001/000659 WO2001075456A1 (en) | 2000-03-27 | 2001-03-26 | A method to measure a movement of an object |
AU2001244944A AU2001244944A1 (en) | 2000-03-27 | 2001-03-26 | A method to measure a movement of an object |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE0001060A SE516072C2 (en) | 2000-03-27 | 2000-03-27 | Ways of measuring the movement of an object by means of a whirlpool sensor |
Publications (3)
Publication Number | Publication Date |
---|---|
SE0001060D0 SE0001060D0 (en) | 2000-03-27 |
SE0001060L SE0001060L (en) | 2001-09-28 |
SE516072C2 true SE516072C2 (en) | 2001-11-12 |
Family
ID=20279012
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE0001060A SE516072C2 (en) | 2000-03-27 | 2000-03-27 | Ways of measuring the movement of an object by means of a whirlpool sensor |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU2001244944A1 (en) |
SE (1) | SE516072C2 (en) |
WO (1) | WO2001075456A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DK2673594T3 (en) * | 2011-02-09 | 2016-04-18 | Balluff Gmbh | A method for detecting a rotation angle of a shaft and / or on the shaft torque occurring and device for carrying out the method |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE456534B (en) * | 1985-11-25 | 1988-10-10 | Bengt Hjalmar Tornblom | DEVICE FOR SEATING AND / OR CONTROL OF PROVOBJECT WITH AN OSCILLATING SENSOR |
DE4014756C2 (en) * | 1990-05-08 | 1995-09-21 | Cenith Controll Gmbh | Measuring method for the detection of material movements |
-
2000
- 2000-03-27 SE SE0001060A patent/SE516072C2/en not_active IP Right Cessation
-
2001
- 2001-03-26 AU AU2001244944A patent/AU2001244944A1/en not_active Abandoned
- 2001-03-26 WO PCT/SE2001/000659 patent/WO2001075456A1/en active Application Filing
Also Published As
Publication number | Publication date |
---|---|
SE0001060D0 (en) | 2000-03-27 |
WO2001075456A1 (en) | 2001-10-11 |
AU2001244944A1 (en) | 2001-10-15 |
SE0001060L (en) | 2001-09-28 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP6430467B2 (en) | Slab quality prediction apparatus and method | |
JP3386051B2 (en) | Method for estimating flow pattern of molten steel in continuous casting, temperature measuring device for mold copper plate, method for determining surface defects of continuous cast slab, method for detecting molten steel flow, method for evaluating non-uniformity of heat removal in mold, method for controlling molten steel flow, Quality control method in continuous casting, continuous casting method of steel, estimation method of molten steel flow velocity | |
US5781008A (en) | Instantaneous slag thickness measuring device | |
RU2678549C2 (en) | Method and device for measuring levels of cast-iron and slag in blast furnace | |
EP0689039A2 (en) | Liquid level detection apparatus and method thereof | |
CN109550906A (en) | The measuring device and its measurement method of molten steel flow velocity in a kind of continuous cast mold | |
JP2003181609A (en) | Method and apparatus for estimating and controlling flow pattern of molten steel in continuous casting | |
EP0554895B1 (en) | Method and apparatus for detecting thickness of and penetrant metal in refractories lined in a vessel for molten metal | |
Chen et al. | Vibration style ladle slag detection method based on discrete wavelet decomposition | |
JP3230513B2 (en) | Method of estimating molten steel flow velocity in continuous casting mold, quality control method in continuous casting of steel, and continuous casting method of steel | |
SE516072C2 (en) | Ways of measuring the movement of an object by means of a whirlpool sensor | |
CN105445363A (en) | Electromagnetic method for monitoring oscillation marks of continuous cast billet | |
JP2854256B2 (en) | Apparatus for discontinuously detecting the thickness of a layer above a metal melt | |
Thomas et al. | Monitoring of meniscus thermal phenomena with thermocouples in continuous casting of steel | |
Mazza et al. | The mold temperature mapping with ultrasonic contactless technology is the key for the real-time initial solidification process control tools | |
CN206580849U (en) | Means for correcting for thermocouple temperature measurement in blast furnace | |
CN210036617U (en) | Molten metal groove erosion degree detection device | |
JPS62192243A (en) | Detection of casting slab longitudinal cracking in continuous casting | |
KR100516028B1 (en) | Method and device for estimating/controlling molten steel flowing pattern in continuous casting | |
JP4414609B2 (en) | Method and apparatus for detecting drift in molten steel in continuous casting of steel | |
JPS6167550A (en) | Instrument for measuring bulging of steel ingot | |
JPH04262841A (en) | Instrument and method for measuring flow speed on surface of molten steel in continuous casting mold | |
JPH0263652A (en) | Method of determining molten metal pond in double belt type continuous casting device | |
Li et al. | VELOCITY MEASUREMENT OF SIMULATED CONTINUOUS CASTING MOULD BY LORENTZ FORCE VELOCIMETRY | |
Li et al. | A new method and a device for calculating graphite shape in cast iron in front of the furnace |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
NUG | Patent has lapsed |
Ref document number: 0001060-3 Format of ref document f/p: F |