EP0239559A2 - Procédé et installation de traitement électrolytique en continu de bandes métalliques avec réglage de l'écart entre la bande et au moins une électrode - Google Patents

Procédé et installation de traitement électrolytique en continu de bandes métalliques avec réglage de l'écart entre la bande et au moins une électrode Download PDF

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Publication number
EP0239559A2
EP0239559A2 EP87890030A EP87890030A EP0239559A2 EP 0239559 A2 EP0239559 A2 EP 0239559A2 EP 87890030 A EP87890030 A EP 87890030A EP 87890030 A EP87890030 A EP 87890030A EP 0239559 A2 EP0239559 A2 EP 0239559A2
Authority
EP
European Patent Office
Prior art keywords
signal
electrodes
electrode
distance
time
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
EP87890030A
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German (de)
English (en)
Other versions
EP0239559A3 (en
EP0239559B1 (fr
Inventor
Erich Mahr
Wilhelm Hofkirchner
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.)
Andritz AG
Original Assignee
Andritz AG
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Filing date
Publication date
Application filed by Andritz AG filed Critical Andritz AG
Publication of EP0239559A2 publication Critical patent/EP0239559A2/fr
Publication of EP0239559A3 publication Critical patent/EP0239559A3/de
Application granted granted Critical
Publication of EP0239559B1 publication Critical patent/EP0239559B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D13/00—Electrophoretic coating characterised by the process
    • C25D13/12—Electrophoretic coating characterised by the process characterised by the article coated
    • C25D13/16—Wires; Strips; Foils
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D7/00—Electroplating characterised by the article coated
    • C25D7/06—Wires; Strips; Foils
    • C25D7/0614—Strips or foils
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D21/00—Processes for servicing or operating cells for electrolytic coating
    • C25D21/12—Process control or regulation

Definitions

  • the invention relates to a method and a device for the continuous electrolytic treatment and / or coating of a moving metallic strip while changing the distance between the strip and at least one electrode as a function of deviations (warpage) of the strip perpendicular to the direction of movement of the strip.
  • the aim is generally to keep the distance between the electrode and the strip as short as possible in order to keep the voltage drop in the electrolyte small and to save power. If the distance is set too small, short circuits and damage to the electrode can occur if the strip is warped.
  • a device for changing the distance of the electrode from the band has become known from US Pat. No. 4,378,284.
  • the electrode is attached to an electrode holder consisting of elastic hoses, the hoses being filled with a liquid medium, for example oil, and changing the Distance occurs due to changes in pressure of the liquid medium.
  • the distance is set according to the working conditions, which influence the efficiency of the electrolysis process. For example, holes or slots can be provided in the end regions of the band, which are detected by optical or electrical devices and thus bring about an inevitable change in the distance.
  • JP-OS-58-113399 also describes a method for automatically adjusting the distance between the electrode and the band.
  • the setting is made as a function of the consumption height H of the anode, the number of ampere hours Axh, a constant K, and a setting value N of the anode size.
  • the object of the invention is to provide a method and a device for automatically adjusting the optimum distance between the electrode and the band in dependence on warpage of the band and on the band speed.
  • the device for carrying out the method is characterized according to the invention by sensor devices which generate at least one continuous or discrete first signal as a function of the deviation of the strip before the deviation arrives at the electrode, measuring devices which have a second signal as a function of the speed of the strip generate signal processing devices, consisting of signal broadening devices, which time widen the first signal while maintaining this maximum value depending on the length of the electrode and depending on the second signal from the occurrence of a maximum value in the first signal, and delay devices connected to the signal processing devices, which broadened the delay the first signal as a function of the distance between the sensor devices and the start of the electrode and as a function of the second signal, the delay time being increased by the actuating time of ampl Is reduced equipment, which are connected to the delay devices in order to change the distance between the band and the electrode depending on the widened and delayed first signal.
  • Fig. 1 denotes a metallic band which is moved between pairs of electrodes E1, E2 and E3, E4 in the horizontal direction, the space between the electrodes being filled with an electrolyte which, depending on the type of electrolytic treatment and / or coating, is composed is.
  • the belt 1 passes through two belt drive rollers 2, the shaft of one of the belt drive rollers being coupled to a speed measuring device 3, for example a tachometer generator.
  • the signal S v of the speed measuring device can optionally be processed via a transducer 4, that is to say, for example, converted into a direct voltage signal which is proportional to the speed of the belt drive roller 2 and thus to the speed V of the belt 1.
  • a sensor device 5 is arranged at the belt 1 in order to detect the deviations (faults) of the belt 1 from the normally flat shape and to produce a steady or discrete signal S a depending on the deviation generate, which may be processed via a transmitter 6.
  • the signals S v and S a are fed to a signal processing circuit 7, which is designed either for analog or for digital signal processing.
  • the signals S v and S a are used by the transducers 4 and 6, while in the case of digital processing the signals S v and S a are used directly or via appropriate analog / digital converters (not shown).
  • the signal processing circuit 7 can preferably be designed as a freely programmable control and computing system or as a microprocessor system.
  • Adjustment devices 8, 9 for the electrodes E 1 and E 3 are connected to the output of the signal processing devices 7.
  • the electrodes E2 and E4 are either adjusted synchronously via a mechanical coupling, or via a second sensor device, a second, similar signal processing circle, and two adjusters connected to it (not shown).
  • This ensures that the electrode E 1 remains adjusted to the dwell time of the warping of the strip when passing through the electrode E 1 in accordance with the maximum value of the warp.
  • the time-extended signal S a ⁇ is then fed to two delay circuits 11 and 12, to which the signal S v is also fed.
  • Dement-speaking there is a delay in the signal S a ⁇ in the delay circuit 12 Duration t v 2 - t s , where l2 is the distance from the sensor device 5 to the beginning of the electrode E3.
  • the output signals of the delay circuits 11, 12 are fed to the adjusting devices 8, 9 as a setpoint. This ensures that when the fault arrives at the corresponding electrode E 1, E 3, the same was adjusted at the right time, ie not too early and not too late, to a value corresponding to the maximum value of the fault.
  • the adjustment devices 8, 9 can be electromechanical, pneumatic or hydraulic, with or without feedback of the actual value of the adjustment.
  • the sensor device 5 consists of two supports 13, 14 made of insulating material, which have, for example, at least three U-shaped recesses, in each of which a metal tube 15, 16, 17, for example made of aluminum, is mounted, the recesses being staggered have different depths.
  • the metal tubes 15, 16, 17 are pressed in the supports 13, 14 by means of springs 18 against the bottom of the recesses.
  • a flexible line for example by soldering, is connected to each metal tube 15, 16, 17 and connected to the connection of a relay coil 19, 20, 21, the other connection of which is connected to an AC voltage source U ⁇ of, for example, 42V.
  • the switching contacts 22, 23, 24 of the relay coils 19, 20, 21 are connected together via corresponding resistors and connected to a DC voltage source U + . Between the connection point of the switching contacts and ground there is a resistor r, from which a discrete signal S a can be derived, as will be explained below.
  • a warp of the band 1 for example touches the metal tube 15, a current flows from the AC voltage source U ⁇ via the relay coil 19, the contact between the metal tube 15 and band 1, and via the grounded band 1 back to the likewise grounded second pole of the AC voltage source U ⁇ , so that the contact 24 is closed and a corresponding signal S a is emitted.
  • the strip will also touch the metal tubes 16, 17, so that correspondingly increased signals S a are emitted by closing the contacts 23, 24.
  • the sensor devices 5 can also be ohmic, inductive or capacitive. Light barriers or ultrasonic transmitter and receiver devices can also be used as sensors.
  • Fig. 3 shows an arrangement of three adjustable pairs of electrodes E1 to E6, which form a unit.
  • the middle electrodes E3, E4 are connected to the positive pole of a direct voltage source and the outer electrodes E1, E2 and E5, E6 are connected to the negative pole thereof, the middle electrodes preferably having twice the length of the outer electrodes.
  • the middle electrodes E3, E4 preferably expand from the center outward by an inclination of 1 to 3 °.
  • the adjoining outer electrodes E1, E2 and E5, E gene are inclined inwards by an angle of 1 to 3 °, as can be seen from FIG. 3.
  • the purpose of this inclination is to compensate for the voltage drop of the current flowing along the band 1, which flows from the middle electrodes E3, E4 via the band 1 to the outer electrodes E1, E2 and E3, E4 by the voltage drop in the electrolyte through the local Changing the distance between the electrodes and the strip changes, so that the total resistance from the electrolyte and strip resistance remains constant. This measure makes the current density more uniform. Additional units of the same type can be attached to this unit of three pairs of electrodes.
  • the signal processing device 7 is preferably designed as a microprocessor system to which, in addition to the signal S v, the signal S a 1 of a sensor device 5 arranged below the belt 1 and the signal S a 2 of a sensor device 5 ⁇ arranged above the belt 1 are fed, the sensor devices 5, 5 ⁇ , for example according to the sensor device shown in Fig. 2 are formed.
  • the signal S a 1 is used for downward warping of the band 1 for adjusting the electrodes E1, E3 and E5, while the signal S a 2 is used for upward warping of the band 1 for adjusting the electrodes E2, E4 and E6 .
  • a single sensor device of the other types mentioned above would also suffice, which detects both upward and downward warping of the strip 1, it being then determined in the signal processing device 7 whether the signal S a , which in the event of a deviation from Zero, ie with a flat band 1, is zero, deviates from zero to plus or minus, and accordingly either the upper electrodes E2, E4 and E6 or the lower electrodes E1, E3 and E5 are adjusted.
  • FIGS. 1 and 3 show the case in which the distance between the band and the electrodes is changed by adjusting the electrodes. It goes without saying that the band can also be adjusted relative to fixed electrodes by adjusting the band guide rollers which are provided at a distance between the electrodes. Likewise, a combined adjustment of the electrodes and the tape guide rollers would be possible.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Automation & Control Theory (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
EP87890030A 1986-03-24 1987-02-17 Procédé et installation de traitement électrolytique en continu de bandes métalliques avec réglage de l'écart entre la bande et au moins une électrode Expired - Lifetime EP0239559B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT776/86 1986-03-24
AT0077686A AT384037B (de) 1986-03-24 1986-03-24 Verfahren und einrichtung zur kontinuierlichen elektrolytischen behandlung und/oder beschichtung eines bewegten metallischen bandes unter veraenderung des abstandes zwischen dem band und zumindest einer elektrode

Publications (3)

Publication Number Publication Date
EP0239559A2 true EP0239559A2 (fr) 1987-09-30
EP0239559A3 EP0239559A3 (en) 1988-02-10
EP0239559B1 EP0239559B1 (fr) 1991-04-10

Family

ID=3499457

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87890030A Expired - Lifetime EP0239559B1 (fr) 1986-03-24 1987-02-17 Procédé et installation de traitement électrolytique en continu de bandes métalliques avec réglage de l'écart entre la bande et au moins une électrode

Country Status (7)

Country Link
US (2) US4735700A (fr)
EP (1) EP0239559B1 (fr)
KR (1) KR930000471B1 (fr)
AT (1) AT384037B (fr)
DE (1) DE3769186D1 (fr)
ES (1) ES2022463B3 (fr)
GR (1) GR3001759T3 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5199157A (en) * 1992-01-21 1993-04-06 Adaptive Technology, Inc. Continuous manufacture of formed, plated component parts having selected alternate configurations
US6096183A (en) * 1997-12-05 2000-08-01 Ak Steel Corporation Method of reducing defects caused by conductor roll surface anomalies using high volume bottom sprays
EP1083593A1 (fr) * 1999-09-10 2001-03-14 Interuniversitair Micro-Elektronica Centrum Vzw Attaque chimique du nitrure de silicium par un gaz halogène anhydre

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4240881A (en) * 1979-02-02 1980-12-23 Republic Steel Corporation Electroplating current control
JPS5915996B2 (ja) * 1980-12-03 1984-04-12 新日本製鐵株式会社 連続金属板処理設備における電解処理装置
JPS58113399A (ja) * 1981-12-28 1983-07-06 Kawasaki Steel Corp 鋼板の連続電気メツキ槽における極間自動調整方法
JPS58140820A (ja) * 1982-02-16 1983-08-20 Nippon Steel Corp メツキ電流自動切換制御装置

Also Published As

Publication number Publication date
EP0239559A3 (en) 1988-02-10
DE3769186D1 (de) 1991-05-16
KR870009056A (ko) 1987-10-23
AT384037B (de) 1987-09-25
GR3001759T3 (en) 1992-11-23
US4789440A (en) 1988-12-06
KR930000471B1 (ko) 1993-01-21
ATA77686A (de) 1987-02-15
ES2022463B3 (es) 1991-12-01
US4735700A (en) 1988-04-05
EP0239559B1 (fr) 1991-04-10

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