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 sensor

Info

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
Application number
SE0001060A
Other languages
Swedish (sv)
Other versions
SE0001060L (en
SE0001060D0 (en
Inventor
Thomas Olsson
Original Assignee
Stiftelsen Metallurg Forsk
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Stiftelsen Metallurg Forsk filed Critical Stiftelsen Metallurg Forsk
Priority to SE0001060A priority Critical patent/SE516072C2/en
Publication of SE0001060D0 publication Critical patent/SE0001060D0/en
Priority to PCT/SE2001/000659 priority patent/WO2001075456A1/en
Priority to AU2001244944A priority patent/AU2001244944A1/en
Publication of SE0001060L publication Critical patent/SE0001060L/en
Publication of SE516072C2 publication Critical patent/SE516072C2/en

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

One measures the velocity and the displacement of an object, for example casting velocity and casting length in the continuous casting of a steel string (11) in the tough environment. In the direction of movement of the object (11), along the movement or opposite the movement, one sweeps an eddy-current inducer (12) a predetermined distance over a surface of the object with the sweep overlapping the preceding sweep and compares the received signal, that defines the topography of the surface, with the signal in the preceding sweep by means of correlation analysis so as to get the displacement that has occurred between the steps. One gets also a measurement of the friction in the mould by registering variations in the oscillation superimposed to the string as a result of the oscillation of the mould.

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)

1. unna» 516 °7?=šïï:“=,f LLii-ítf: "" Patentkrav1. work »516 ° 7? = Šïï:“ =, f LLii-ítf: "" Patent claim 1. Sätt att mäta en förflyttning av ett föremål (11), kännetecknat av att man i föremålets (11) rörelseriktning, med eller motsatt rörelsen, sveper en virvelströmsgivare (12) en förutbestämd sträcka över en yta på föremålet med svepet omlott med ett föregående svep och jämför den erhållna signalen som anger ytans topografi med signalen från det föregående svepet med hjälp av korrelationsanalys för att få fram den förflyttning som skett mellan stegen. Sätt enligt patentkrav 1;kännetecknat av att man anpassar svepfrekvens och sveplängd till föremålets (11) rörelse så att svepen går omlott minst 50%. Sätt enligt något av föregående patentkrav kännetecknat av att man mäter förflyttningen av ett föremål (11) som har en rörelse med överlagrad oscillation och sveper med en frekvens som är minst 5 gånger oscillationsfrekvensen. Sätt enligt något av föregående patentkrav, kännetecknat av att man mäter gjuthastigheten vid kontinuerlig gjutning av metall i genomströmningsskokill genom att svepa virvelströmsgivaren (12) över strängen (12) som kommer ut ur kokillen. Sätt enligt patentkrav 4, kännetecknat av att man sveper över strängen (12) inuti en kylkammare under kokillen.Method of measuring a displacement of an object (11), characterized in that in the direction of movement of the object (11), with or opposite the movement, an eddy current sensor (12) sweeps a predetermined distance over a surface of the object with the sweep wrapped around a previous sweep and compare the obtained signal indicating the topography yt of the surface with the signal from the previous sweep using correlation analysis to obtain the movement that has taken place between the steps. Method according to Claim 1, characterized in that the sweeping frequency and the length of the sweep are adapted to the movement of the object (11) so that the sweep rotates at least 50%. Method according to one of the preceding claims, characterized in that the movement of an object (11) which has a movement with superimposed oscillation and sweeps with a frequency which is at least 5 times the oscillation frequency is measured. Method according to one of the preceding claims, characterized in that the casting speed is measured during continuous casting of metal in a flow-through mold by sweeping the eddy current sensor (12) over the string (12) coming out of the mold. A method according to claim 4, characterized in that one sweeps over the string (12) inside a cooling chamber under the mold.
SE0001060A 2000-03-27 2000-03-27 Ways of measuring the movement of an object by means of a whirlpool sensor SE516072C2 (en)

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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2673594B1 (en) * 2011-02-09 2016-02-03 Balluff GmbH Method for detecting the torsion angle of a shaft and/or of a torque occurring on the shaft and device of carrying out said method

Family Cites Families (2)

* Cited by examiner, † Cited by third party
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

Also Published As

Publication number Publication date
SE0001060L (en) 2001-09-28
SE0001060D0 (en) 2000-03-27
WO2001075456A1 (en) 2001-10-11
AU2001244944A1 (en) 2001-10-15

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