EP0656071A1 - Procede et dispositif de regulation de la puissance calorifique d'une installation de recuit au passage de produits metalliques coules en continu. - Google Patents

Procede et dispositif de regulation de la puissance calorifique d'une installation de recuit au passage de produits metalliques coules en continu.

Info

Publication number
EP0656071A1
EP0656071A1 EP93919106A EP93919106A EP0656071A1 EP 0656071 A1 EP0656071 A1 EP 0656071A1 EP 93919106 A EP93919106 A EP 93919106A EP 93919106 A EP93919106 A EP 93919106A EP 0656071 A1 EP0656071 A1 EP 0656071A1
Authority
EP
European Patent Office
Prior art keywords
glow
annealing
voltage
value
current
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
EP93919106A
Other languages
German (de)
English (en)
Other versions
EP0656071B1 (fr
Inventor
Guenther Phillip
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Maschinenfabrik Niehoff GmbH and Co KG
Original Assignee
Maschinenfabrik Niehoff GmbH and Co KG
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 Maschinenfabrik Niehoff GmbH and Co KG filed Critical Maschinenfabrik Niehoff GmbH and Co KG
Publication of EP0656071A1 publication Critical patent/EP0656071A1/fr
Application granted granted Critical
Publication of EP0656071B1 publication Critical patent/EP0656071B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D11/00—Process control or regulation for heat treatments
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/62—Continuous furnaces for strip or wire with direct resistance heating

Definitions

  • the present invention relates to a method and a device for regulating the heating power of a resistance annealing system.
  • a continuous resistance annealing system is used to subject metallic extrudates to heat treatment, with the term “metallic extrudates” here being wire made of ferrous and non-ferrous metals, in particular copper, but also bundles of parallel, twisted or stranded Wires from these materials should be understood.
  • metallic extrudates here being wire made of ferrous and non-ferrous metals, in particular copper, but also bundles of parallel, twisted or stranded Wires from these materials should be understood.
  • wire is generally used in the following to identify these products.
  • the wire is guided over at least two contact elements which have a different voltage potential, so that a current flows through the wire, which leads to its heating.
  • Rotating rollers are preferably used as contact elements, the peripheral speed of which is substantially equal to the throughput speed of the wire; however, electrolyte baths and metal baths as well as fixed contact elements can also be used.
  • flexible electrical lines generally have copper strands which consist of individual wires with a diameter of e.g. 0.2 mm can be manufactured. If one or more of these individual wires of the strand breaks during use, not only is the electrical conductivity impaired, but there is in particular the risk that individual wires penetrate the electrical insulation, which means a considerable risk of accident.
  • the structure of the metal structure changes, as a result of which the wire becomes hard and brittle and has only a low flexural fatigue strength.
  • the wire is subsequently subjected to a heat treatment in a continuous annealing plant.
  • the achieved annealing temperature of the wire must lie within a precisely defined temperature range, its shortfall or shortfall leads to a reduction in quality and thus to rejects.
  • U e is the effective value of the heating voltage
  • v is the speed at which the wire runs through the continuous annealing system
  • G is the so-called annealing factor, which is product and system-specific.
  • the power control is usually carried out by means of thyristors connected in parallel, the firing angle of which is controlled accordingly.
  • the present invention is therefore based on the object of providing an improved method and an improved device for regulating the heating power in a continuous annealing system for metallic extrudates, in which an exactly reproducible temperature is achieved which is largely independent of external temperatures Influences, such as wear of the contact rollers or brushes.
  • the device according to the invention is the subject of claim 4.
  • the method according to the invention it is possible to measure the annealing power supplied to the wire very precisely and independently of the possible wear of the surfaces of the contact elements or contact rollers.
  • the wire speed is measured, which results in the amount of wire passing through the annealing system per unit of time.
  • an appropriately programmed control device calculates which annealing power is to be supplied to the wire so that the desired wire temperature is reached. If the annealing installation has several individual annealing sections, the annealing output can be specified separately for each individual annealing section.
  • a default value for the setting of the effective value of the glow voltage is then derived using the phase control. tet. This means that overall there is a target state, which can, however, differ considerably from the actual state, for example depending on the contact resistance between the brushes and the rotating contact rollers, on the contact resistance between the contact rollers or the contact elements and the wire, etc.
  • the glow voltage supplied to the contact elements is measured and digitized in an analog / digital converter.
  • the current flowing in the wire is also measured. This value is also digitized.
  • the rms values and the total annealing power supplied to the wire are calculated from the digitized values of current and voltage and compared with the actual value. If the actual value deviates, the voltage regulation is changed accordingly.
  • the method according to the invention has considerable advantages over the methods known in the prior art.
  • the rms value of the glow voltage is formed by squaring the voltage signal in an electronic module.
  • this value is associated with an error that has a greater or lesser effect, since the effect value image is only for a certain curve shape, e.g. only forms a correct value for a sinusoidal curve.
  • the accuracy of the control is considerably improved by digitizing the values and calculating the effective value from the digitized values.
  • the detection of the current flowing in the wire passing through allows a further increase in the accuracy of the glow power control.
  • the total voltage applied to the contact elements is only the voltage also applied to the respective wire section if the voltage is supplied to the contact element and the wire itself has no contact resistance.
  • a contact resistance resulting from wear or contamination, for example between a brush and a rotating contact roller, or between the contact roller and the wire, causes an increase in the overall resistance and thus a decrease in the current flowing through the wire.
  • the contact resistances thus reduce the temperature achieved in a conventional system, without this being able to be detected by the control.
  • the device according to the invention for regulating the glow power has devices for detecting the respective instantaneous value of the voltage and the current applied to the glow line. The voltage is measured in a conventional manner.
  • the measurement of the current can be carried out in the feed lines, but it is preferred, particularly when using an annealing system with a plurality of annealing sections arranged one after the other, to use a current measuring device which can directly measure the current flowing in the wire.
  • a current measuring device which can directly measure the current flowing in the wire.
  • a slotted iron ring is used according to the invention, through which the wire runs without contact, and in which the magnetic flux induced by the current flowing in the wire is detected by a Hall probe.
  • the detection of the current flowing in the wire has the advantage that the influence of leakage currents is thereby eliminated. Such leakage currents occur, for example, when the contact rollers are dirty or when the electrolyte is dirty.
  • the current measurement can be carried out in each annealing section. If the equipment complexity is to be reduced, it is also possible to record the current only in the last or in the first and the last annealing section.
  • Figure 1 is a functional diagram of an embodiment of the device according to the invention.
  • FIG. 6 shows a diagram which shows the values of voltage, current and the power calculated therefrom in dimensionless in an experiment Shows units over time;
  • FIG. 7 is a perspective view of a transducer for measuring the current.
  • the exemplary embodiment according to FIG. 1 shows the application of the present invention in a three-phase glow device which is traversed by a copper wire with a diameter of 0.63 mm.
  • the speed of the wire is - 10 m / s.
  • the three-phase glow device has four contact rollers 1, 2, 3 and 4, which are shown in the diagram in FIG. 1 in one plane.
  • the wire D moves at the speed v in the direction of the arrow 5 through the wire glow device, the speed being detected by means of a tachometer generator 7.
  • the contact rollers 1 to 4 are supplied via a three-phase network 9, which has three phases R, S, T, which, as is known, are 120 "out of phase with one another.
  • the phases of the three-phase current are connected to three AC controllers 10, 11, 12 which each consist of two counter-parallel connected thyristors 15, 16 and two resistors 17, 18.
  • the AC power controllers 10, 11, 12 are each connected to the primary side of one of the three transformers 21, 22 and 23, which are connected in a triangle on the primary side. On the secondary side, the three transformers 21, 22, 23 are connected in a star.
  • the output of transformer 21 leads to contact rollers 1 and 4, the output of transformer 22 to contact roller 2 and the output of transformer 23 to contact roller 3. Since contact roller 1 and contact roller 4 have the same voltage potential, the External glow device electrically neutral.
  • the glow voltages U ⁇ , U 2 , U 3 applied to the glow lines I, II, III are detected by measuring devices 30, 31, 32 and converted into a digital voltage value in the converter devices 35, 36, 37.
  • Each converter device 35, 36, 37 has an isolation isolating amplifier, which is followed by a low-pass filter with a cut-off frequency of 1000 Hz.
  • the output signal of the filter is fed to an analog / digital converter and digitized.
  • the sampling takes place at a time interval of 500 ⁇ s, the resolution is 12 bits.
  • the current flowing through the wire in the annealing sections I, II, III is detected by means of sensors 40, 41 and 42, the sensor being explained in detail with reference to FIG. 7.
  • the measured variables recorded are digitized in the converter devices 45, 46, 47.
  • the converter devices 45, 46, 47 for the current values in the same way as the converter devices 35, 36, 37 for the voltage values, consist of a low-pass filter with a cut-off frequency of 1000 Hz, followed by an analog / digital converter is switched. Sampling rate and resolution are the same as for the converter devices 35 to 37.
  • the output voltage of the tachometer generator is also digitized in a converter device 48.
  • the digitized values are fed to a processor device 50, preferably a microprocessor device, in which the effective values for the voltage and the current are obtained from the digitized values and the effective annealing output in the individual annealing sections is determined, as will be described below will be explained later.
  • a processor device 50 preferably a microprocessor device, in which the effective values for the voltage and the current are obtained from the digitized values and the effective annealing output in the individual annealing sections is determined, as will be described below will be explained later.
  • the processor device 50 control signals, which are converted in signal generating devices 53, 54, 55 into control signals suitable for controlling the AC power controller.
  • the sensors 40, 41 and 42 for detecting the current flowing in the glow lines consist, as shown in FIG. 7, of an iron ring 70 which is interrupted by a gap 71.
  • a Hall probe 73 with leads 74, 75 is glued into the gap 71.
  • the current flowing in the glow lines induces a magnetic flux in the iron ring 70, which is measured in the gap 71 by the Hall probe 73.
  • the Hall voltage present at the leads 74, 75 can be converted directly into the current flowing through the glow path.
  • measuring device for measuring the current in a wire annealing device has particular advantages. On the one hand, the measurement is carried out without contact, so that neither the wire nor the sensor are subject to wear. Furthermore, the measuring device is essentially insensitive to contamination. Since the Hall probe works practically without inertia, the current can be measured very precisely and with an exact time course.
  • the sensor shown in FIG. 7 is essentially made in one piece, i.e. the wire has to be threaded through the opening in the ring 70.
  • a divisible ring can also be used, in which the wire only has to be inserted.
  • the glow voltage curve is designated 82.
  • FIG. 3 shows the amplitude spectrum of the curve of the glow voltage according to FIG. 2.
  • a dimensionless characteristic value of the amplitude is plotted on the ordinate 83 and the frequency is plotted on the abscissa 84 in kHz.
  • the course of the amplitude over the frequency is designated 85.
  • FIG. 4 shows the time course of the current 92 in the glow path III for a predetermined time interval.
  • a dimensionless characteristic value of the glow current is plotted on ordinate 90 and time is plotted on abscissa 91. 9th.
  • FIG. 5 shows (for a larger time interval than FIG. 4) the effective value 97 of the current, a dimensionless characteristic value of the current also being plotted on the ordinate 95 and the time on the abscissa 96. It is interesting to see that the current is subject to greater fluctuations despite the constant wire throughput speed.
  • the processor device 50 determines the glow power in the individual glow lines by multiplying the respective effective values of voltage and current.
  • FIG. 6 shows the glow voltage, the glow current and the glow power in the glow path III arranged one above the other in a diagram.
  • a dimensionless characteristic value of the voltage is plotted on the ordinate 111 and the time is plotted on the time axis 112.
  • the curve shape 113 denotes the dimensionless characteristic value of the tension.
  • a dimensionless characteristic value of the current is plotted on the ordinate 121 and the time on the abscissa 122, in the same units as in diagram 110.
  • the curve 123 shows the course of a dimensionless characteristic value of the glow current over time like ⁇ the.
  • a dimensionless characteristic value for the electrical power is plotted on the ordinate 130, and the time on the abscissa 132 in the same units and at the same time as in the diagrams 110 and 120.
  • the curve 133 shows the current, of the processor 50 calculates the glow power.
  • the processor device 50 now compares the currently supplied power for each of the glow sections I, II and III with the glow power which is required for the respective speed. This can be done by evaluating the formula given above. Instead, it is also possible to store a corresponding characteristic diagram for the desired glow power values in a memory of the control device 50, from which the required glow power for the glow paths I, II and III is then determined, if necessary with an interpolation.
  • the signal generating devices 53, 54, 55 are influenced in a corresponding manner in order to change the glow voltage in the individual glow lines in such a way that the deviation is minimized. This enables a very fast and precise regulation of the annealing output, which has a very positive effect on the quality of the wire produced.
  • the processor device also has the task of monitoring the measured variables in order to determine irregular operation of the system, in particular the wear of brushes and / or contact rollers.
  • the resistance of the wire in the individual glow lines is known, it can be determined whether a larger, undesired voltage drop occurs in the current transmission from brush to contact roller or from contact roller to the wire. It is found that the voltage required to generate a certain glow current is higher than a predetermined limit value, a signal is output to indicate the malfunction of the glow system.
  • comparison values can also be stored in the form of a table, which shows which glow voltage is required for correct operation in order to produce a specific glow current. If the measured RMS values of the voltage exceed these stored values by a certain amount, this indicates an undesirably high contact resistance.
  • the processor device 50 also monitors the temporal fluctuations of the glow current and glow power. If the glow current is subject to greater fluctuations in time, this is a clear sign that the current transmission is uneven. This is an indication of the wear of the contact rollers. To evaluate the fluctuation, the effective value of the glow current and the glow power are examined in relation to the fluctuation in amplitude and the frequency of the fluctuations. For this purpose, the values of the glow current and the glow power, which are already available in digital form, are subjected to numerical static methods for curve evaluation, as are known in the prior art.
  • each of the glow lines I, II and III is individually regulated to the predetermined glow power value.
  • the annealing section III will preferably be regulated; if two annealing sections are regulated, the annealing section I and the annealing section III are preferably regulated.
  • the annealing power supplied to the last annealing section III is increased so far for a predetermined period of time that the cooling that has occurred in the annealing device is compensated. Since, at a time interval of 500 ⁇ s between the individual scans at a wire speed of 10 m / s, the individual measuring points are 5 mm apart with respect to the wire, the control can be carried out particularly precisely.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Control Of Heat Treatment Processes (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)
  • Detection And Correction Of Errors (AREA)

Abstract

Un procédé et un dispositif permettant de réguler la puissance de recuit dans au moins une section de recuit d'une installation de recuit au passage de produits métalliques coulés en continu. La vitesse de passage des produits coulés en continu (D) à travers le dispositif de recuit au passage est détectée, ainsi que la tension momentanée appliquée à la section de recuit, qui est transformée en une valeur effective (Ue) au moyen d'un dispositif de commande (50). La tension fournie à la section de recuit est modifiée par un signal de commande dérivé de la valeur effective ainsi déterminée de la tension, afin d'atteindre une valeur prédéterminée de la puissance de recuit dépendante de la vitesse mesurée. Au moins le courant passant dans une section de recuit est détecté et également transformé en une valeur effective. La puissance de recuit réellement fournie à la section de recuit est calculée sur la base de ces valeurs effectives. La valeur de la tension est modifiée par un dispositif de commande jusqu'à ce qu'une valeur prédéterminée de la puissance de recuit soit atteinte.
EP93919106A 1992-08-21 1993-08-19 Procede et dispositif de regulation de la puissance calorifique d'une installation de recuit au passage de produits metalliques coules en continu Expired - Lifetime EP0656071B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4227812 1992-08-21
DE4227812A DE4227812C2 (de) 1992-08-21 1992-08-21 Verfahren und Vorrichtung zur Regelung der Heizleistung in einer Durchlauf-Glühanlage für metallisches Stranggut
PCT/EP1993/002222 WO1994004708A1 (fr) 1992-08-21 1993-08-19 Procede et dispositif de regulation de la puissance calorifique d'une installation de recuit au passage de produits metalliques coules en continu

Publications (2)

Publication Number Publication Date
EP0656071A1 true EP0656071A1 (fr) 1995-06-07
EP0656071B1 EP0656071B1 (fr) 1997-06-11

Family

ID=6466125

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93919106A Expired - Lifetime EP0656071B1 (fr) 1992-08-21 1993-08-19 Procede et dispositif de regulation de la puissance calorifique d'une installation de recuit au passage de produits metalliques coules en continu

Country Status (7)

Country Link
US (1) US5700335A (fr)
EP (1) EP0656071B1 (fr)
JP (1) JPH08503258A (fr)
AT (1) ATE154398T1 (fr)
DE (1) DE4227812C2 (fr)
FI (1) FI101313B (fr)
WO (1) WO1994004708A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004034939B4 (de) * 2004-07-20 2015-11-26 Maschinenfabrik Niehoff Gmbh & Co. Kg Verfahren und Anordnung sowie Computerprogramm mit Programmcode-Mitteln und Computerprogramm-Produkt zur Ermittlung einer Steuergröße für einen Leistungseintrag auf einen Draht bei einer konduktiven Wärmebehandlung des Drahtes
US20060049160A1 (en) * 2004-09-08 2006-03-09 Gunnar Holm Method and arrangement for annealing of strips
FR2876493B1 (fr) † 2004-10-12 2007-01-12 F S P One Soc Par Actions Simp Cable toronne en aluminium cuivre, et procede pour sa fabrication.
CN1300347C (zh) * 2004-12-09 2007-02-14 清华大学深圳研究生院 铜线的高能连续电脉冲在线退火方法及装置
JP5274782B2 (ja) * 2007-03-27 2013-08-28 株式会社ミツトヨ 表面性状測定装置、表面性状測定方法及び表面性状測定プログラム
DE102008004015B4 (de) * 2008-01-11 2018-01-11 Continental Automotive Gmbh Verfahren zur Erkennung von Übergangswiderständen in Leitungen einer Sonde
US8816259B2 (en) * 2012-04-06 2014-08-26 Siemens Aktiengesellschaft Pack heat treatment for material enhancement
ITBO20130601A1 (it) * 2013-11-04 2015-05-05 Samp Spa Con Unico Socio Forno di ricottura a resistenza per la ricottura di un filo, trefolo, corda, vergella o piattina di metallo
ITBO20130602A1 (it) * 2013-11-04 2015-05-05 Samp Spa Con Unico Socio Forno di ricottura a resistenza per la ricottura di un filo, trefolo, corda, vergella o piattina di metallo

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1266335B (de) * 1964-08-19 1968-04-18 Siemens Ag Einrichtung zur Regelung der Gluehtemperatur bei einer Drahtanlage
DE1265183C2 (de) * 1966-06-22 1975-01-23 Siemens AG, 1000 Berlin und 8000 München Verfahren und anordnung zur regelung der heizleistung einer draht- oder bandgluehanlage
US3842239A (en) * 1972-12-08 1974-10-15 Interstate Drop Forge Co Power control circuit for resistance heating moving conductors
JPH01290718A (ja) * 1988-05-16 1989-11-22 Babcock Hitachi Kk 熱処理温度の制御方法
DE4010309C1 (en) * 1990-03-30 1991-05-23 Maschinenfabrik Niehoff Gmbh & Co Kg, 8540 Schwabach, De Maintenance of annealing temp. even after stoppage - involves measuring speed of wire and tacho:generator output voltage to produce control signal for thyristor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9404708A1 *

Also Published As

Publication number Publication date
JPH08503258A (ja) 1996-04-09
EP0656071B1 (fr) 1997-06-11
FI101313B1 (fi) 1998-05-29
ATE154398T1 (de) 1997-06-15
WO1994004708A1 (fr) 1994-03-03
FI950762A0 (fi) 1995-02-20
US5700335A (en) 1997-12-23
DE4227812C2 (de) 2001-01-04
FI101313B (fi) 1998-05-29
DE4227812A1 (de) 1994-02-24
FI950762A (fi) 1995-02-20

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