EP0658635B1 - Conductor roll - Google Patents

Conductor roll Download PDF

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Publication number
EP0658635B1
EP0658635B1 EP19940117700 EP94117700A EP0658635B1 EP 0658635 B1 EP0658635 B1 EP 0658635B1 EP 19940117700 EP19940117700 EP 19940117700 EP 94117700 A EP94117700 A EP 94117700A EP 0658635 B1 EP0658635 B1 EP 0658635B1
Authority
EP
European Patent Office
Prior art keywords
tungsten
roll
conductor
rolls
coating
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.)
Expired - Lifetime
Application number
EP19940117700
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0658635A1 (en
Inventor
Christian Leconte
Gerhard Grasset
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.)
Praxair ST Technology Inc
Praxair Technology Inc
Original Assignee
Praxair ST Technology Inc
Praxair Technology Inc
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 Praxair ST Technology Inc, Praxair Technology Inc filed Critical Praxair ST Technology Inc
Publication of EP0658635A1 publication Critical patent/EP0658635A1/en
Application granted granted Critical
Publication of EP0658635B1 publication Critical patent/EP0658635B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
    • 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
    • C21D9/562—Details
    • C21D9/563—Rolls; Drums; Roll arrangements
    • 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 invention relates to an annealing apparatus employing a conductor roll for use in annealing wire, such as copper wire, comprising a substrate having good electrical conductivity and a top coating of tungsten or a tungsten based alloy with a surface roughness of said coating of at least 2 ⁇ m Ra.
  • the annealing of copper wire copper rolls or hoops are used to heat the wire by the Joule effect. Copper is the preferred material for the conductor roll because it has good conductivity.
  • the copper wire is fed in contact over two spaced apart conductive rolls connected to a power source. One roll is positive while the other roll is negative. Heat is generated in the copper wire when the rolls are connected to a power source since the copper wire completes the circuit between the conductive rolls.
  • the wire is continuously fed over the conductor rolls as a desired speed whereupon the wire is heated and then it is cooled in a conventional manner. The copper wire contacts the conductor rolls and the friction therebetween causes wear in the surface of the conductor rolls.
  • EP-A-0266509 there has been disclosed an apparatus for continuously annealing metal strips, and a hearth roll employed therein. It was taught to provide the hearth roll with a predetermined roughness before the hearth roll is coated with a wear-resistant surface coating defined by a spray coated ceramic or chrome plating. The thickness of the coating is selected so that the coated hearth roll has a surface roughness Ra of between 4.5 ⁇ m and 20 ⁇ m.
  • JP-A-4120297 discloses a conductor roll to be used for electroplating lines for cold rolled steel plates.
  • the surface of the roll is coated with a hard Cr plating or Ni-W alloy plating containing about 20 to 24 wt. % tungsten.
  • Another object of the present invention is to provide a cost effective and good wear resistance coating for conductor rolls for use in annealing wire, such as copper wire.
  • the invention relates to a conductive roll for use in annealing wire comprising a conductive substrate coated with a tungsten or tungsten based alloy and wherein the surface of said coating has a surface roughness of at least 2 ⁇ m Ra.
  • the substrate of the conductive roll has to have good electrical conductivity and withstand the heat of an annealing process. Although the preferred material for the substrate would be copper, it could also be made of bronze, nickel and steel.
  • the coating for the conductive roll is tungsten or a tungsten based alloy. It is not enough to have a tungsten or a tungsten based alloy coating, but the coating must have a surface roughness of at least 2 ⁇ m Ra, preferably 5 ⁇ m Ra or above.
  • the coating thickness can vary from 50 to 150 ⁇ m thick.
  • the coating could be grit blasted using a material such as ceramic beads, metallic beads or the like; laser engraved using conventional laser devices; electro-erosion of the coating surface; machining of the surface to get the required roughness; or any other conventional techniques.
  • the substrate could be treated, such as by grit blasting, to produce the necessary roughness prior to or after depositing the coating on its surface.
  • an undercoat could be deposited, such as nickel or nickel based alloy, which could have the desired roughness or made to have the desired surface roughness so that the topcoat of tungsten or a tungsten based alloy will conform to the surface contour of the undercoat.
  • a nickel-aluminum undercoating is a good corrosion resistant layer for many substrates and thus would provide a good duplex coating with the tungsten or tungsten alloy top coating.
  • any good corrosion resistant undercoat could be used such as nickel, nickel-containing coatings and the like.
  • the top coat could also be sealed with a suitable sealer, such as an epoxy sealant. This could also protect the substrate by providing a barrier to prevent penetration of any detrimental elements in the environment of the annealing process.
  • Figure 1 is a schematic diagram of an annealing process for copper wire.
  • Figure 2 is a perspective view of an arc segment of a conductive roll shown in Figure 1.
  • Figure 3 is a perspective view of an arc segment of a conductive roll with the coating of this invention and showing copper wires being fed over such coating.
  • Figure 4 is a cross section of the conductor roll of Figure 3 taken through line 4-4.
  • FIG. 1 a schematic diagram is shown of an annealing process 2 for copper wire 4 in which the copper wire 4 is fed over conventional rolls 6 to negative conductor rolls 8, positive roll 10 and negative roll 9.
  • the negative conductor rolls 8-9 and the positive conductor roll 10 are connected across a voltage supply (not shown), such as 30 volts, and then the copper wire 4 is fed over these conductor rolls 8-9 and 10 to form a circuit that can develop a high current such as 125 amperes.
  • the resistive heating of the copper wire 4 can increase the temperature of the wire, as for example up to 200°C or higher.
  • the copper wire 4 is then fed from conductor roll 10 to conductor roll 9 in which it is fed into a suitable tank 15 where an inert gas nitrogen 12 is contained over a mixture of water and oil 14.
  • the heated wire 4 is then cooled by the water and oil mixture 14 and is fed over roll 7 where it is then suitably wound for storage and/or shipment to a desired locality.
  • the speed at which the copper wire 4 is fed over the rolls 8-9-10 is generally about 15 meters per second. For different annealing processes, this speed can vary either lower or higher.
  • Figure 2 shows an arc segment of a conductor roll 16 after it had been used in an annealing process for two parallel spaced apart copper wires.
  • the contact of the copper wire with the conductor roll 16 created friction in which semi-circular grooves 18 were created in the conductor roll. After the grooves 18 are formed to a certain depth and width, the conductor roll has to be removed and replaced by a new conductor roll.
  • Figures 3 and 4 show an arc segment of a conductor roll 20 having a coating 22 and two parallel aligned, spaced apart copper wires 24 being fed over the coating 22.
  • the copper wire 24 contacts the peaks 26 of the coating 22 so that only minimum contact is made between the coating 22 and the copper wires 24. Since the coating 22, which is a tungsten or tungsten based alloy coating, has good wear resistance characteristics, the coated conductor roll 20 will provide a greater service life than an uncoated conductor roll.
  • a copper wire 0.5 mm thick was annealed in an apparatus as shown in Figure 1.
  • uncoated conductor rolls were used and in another annealing process, the conductor rolls were coated with tungsten and had a surface roughness of different values.
  • the conductor rolls that were coated were first grit blasted with 20 mesh size aluminum oxide particles at a pressure of about 159 kPa (23 psi).
  • the tungsten coating was then deposited to a thickness of 100 mm.
  • the annealing process used a 30-volt power source that produced a current of 125 amperes.
  • the temperature of the wire between the negative conductor roll and positive conductor roll was about 200°C and the temperature of the water-oil mixture was about 40°C
  • the copper wire was fed over the conductor rolls at a speed of about 15 meters per second. In the annealing process that used the uncoated conductor rolls, the rolls had to be replaced after 60 hours of use.
  • the coated conductor rolls that were surface finished to 0.05 ⁇ m Ra lasted for 175 hours; the coated conductor rolls that were surface finished to about 5.5 ⁇ m Ra lasted for 325 hours; and the conductor rolls that were surface finished to 10 microns Ra lasted for about 900 hours.
  • the conductor rolls that have been coated with tungsten and surface finished to several microns Ra in accordance with this invention will provide longer service in annealing copper wire than uncoated conductor rolls or conductor rolls that are coated but have a surface finish of less than 2 ⁇ m Ra.
  • an undercoat such as nickel aluminum
  • a sealant such as an epoxy
  • any material can be used as the substrate as long as it is sufficiently conductive to pass a desired current through the copper wire.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Non-Insulated Conductors (AREA)
EP19940117700 1993-11-10 1994-11-09 Conductor roll Expired - Lifetime EP0658635B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US15052093A 1993-11-10 1993-11-10
US150520 1993-11-10

Publications (2)

Publication Number Publication Date
EP0658635A1 EP0658635A1 (en) 1995-06-21
EP0658635B1 true EP0658635B1 (en) 1999-03-24

Family

ID=22534930

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19940117700 Expired - Lifetime EP0658635B1 (en) 1993-11-10 1994-11-09 Conductor roll

Country Status (6)

Country Link
EP (1) EP0658635B1 (ja)
JP (1) JP3065219B2 (ja)
CA (1) CA2135510C (ja)
DE (1) DE69417367T2 (ja)
ES (1) ES2129098T3 (ja)
SG (1) SG49600A1 (ja)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITUA20162154A1 (it) * 2016-03-31 2017-10-01 Sampsistemi S R L Forno di ricottura a resistenza per la ricottura di almeno un filo, trefolo, corda, vergella o piattina di metallo o lega metallica

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58116956A (ja) * 1981-12-29 1983-07-12 Kawasaki Steel Corp 高珪素薄鋼帯製造用ロ−ル
JPS58207390A (ja) * 1982-02-10 1983-12-02 Mitsubishi Steel Mfg Co Ltd 電気メツキ用通電ロ−ル
ES2019913B3 (es) * 1986-09-05 1991-07-16 Kawasaki Steel Co Aparato para recocido continuo de banda metalica y los rodillos de la camara del mismo.
JPH0234209A (ja) * 1988-07-21 1990-02-05 Showa Alum Corp 冷間圧延用ロール
JPH07122157B2 (ja) * 1990-09-11 1995-12-25 株式会社サトーセン ロールの表面処理方法

Also Published As

Publication number Publication date
CA2135510C (en) 1999-09-21
DE69417367T2 (de) 1999-08-26
SG49600A1 (en) 1998-06-15
CA2135510A1 (en) 1995-05-11
ES2129098T3 (es) 1999-06-01
JPH07197133A (ja) 1995-08-01
EP0658635A1 (en) 1995-06-21
DE69417367D1 (de) 1999-04-29
JP3065219B2 (ja) 2000-07-17

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