EP0658635A1 - Conductor roll - Google Patents
Conductor roll Download PDFInfo
- Publication number
- EP0658635A1 EP0658635A1 EP94117700A EP94117700A EP0658635A1 EP 0658635 A1 EP0658635 A1 EP 0658635A1 EP 94117700 A EP94117700 A EP 94117700A EP 94117700 A EP94117700 A EP 94117700A EP 0658635 A1 EP0658635 A1 EP 0658635A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tungsten
- roll
- conductor
- conductor roll
- rolls
- 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
Links
Images
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 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 microns 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.
- 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 microns 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 microns Ra, preferably 5 microns Ra or above.
- the coating thickness can vary from 50 to 150 microns 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 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 micron Ra lasted for 175 hours; the coated conductor rolls that were surface finished to about 5.5 microns 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 microns 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)
- Materials Engineering (AREA)
- Mechanical 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)
Abstract
Description
- The invention relates to 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 microns Ra.
- In 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. In a typical or conventional annealing apparatus, 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. In the annealing of copper wire, 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. Once the wear of the rolls becomes undesirable for efficient operation of the annealing process, the rolls are replaced. This results in a shut down of the annealing operation and thus loss of productivity. It has been proposed to substitute nickel in place of copper for the roll material since nickel has better wear resistance characteristics. However, nickel rolls are much more expensive than copper rolls and are still subject to wear resistance.
- It is an object of the present invention to provide a conductor roll with a tungsten or tungsten based alloy coating having a roughness of at least 3 microns Ra and which coating has excellent wear resistance characteristics when used in annealing wire, such as copper wire.
- 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 present invention will become more apparent from the following description thereof when considered together with the accompanying drawings which are set forth as being exemplary of embodiments of the present invention and are not intended in any way to be limitative thereof.
- 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 microns 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 microns Ra, preferably 5 microns Ra or above. The coating thickness can vary from 50 to 150 microns thick. To produce the necessary roughness in the surface coating, 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. Alternately, 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. An undercoat of nickel with five percent by weight aluminum has been observed to have the natural roughness that would be suitable for this invention. 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. In the practice of this invention, 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.
- Upon testing of the coating of this invention, it was believed that a smooth surface could provide a better surface to reduce friction wear on the conductive roll since the wire could slide over the roll with less friction. However, it was found that to increase the friction wear of the coated roll, it was necessary to roughen the surface to 2 microns Ra or greater.
- 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.
- Referring to Figure 1, a schematic diagram is shown of an
annealing process 2 for copper wire 4 in which the copper wire 4 is fed overconventional rolls 6 tonegative conductor rolls 8,positive roll 10 andnegative roll 9. The negative conductor rolls 8-9 and thepositive 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. As the conductor wire 4 is fed fromconductor roll 8 toconductor roll 10, a current flows through the copper wire and due to IR losses, the copper wire is heated. The copper wire 4 is then fed fromconductor roll 10 toconductor roll 9 in which it is fed into asuitable tank 15 where aninert gas nitrogen 12 is contained over a mixture of water andoil 14. The heated wire 4 is then cooled by the water andoil mixture 14 and is fed overroll 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 theconductor roll 16 created friction in whichsemi-circular grooves 18 were created in the conductor roll. After thegrooves 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 aconductor roll 20 having acoating 22 and two parallel aligned, spaced apartcopper wires 24 being fed over thecoating 22. As shown in Figure 4 which is an enlarged view of a segment of the arc segment of Figure 3 taken through lines 4-4, thecopper wire 24 contacts thepeaks 26 of thecoating 22 so that only minimum contact is made between thecoating 22 and thecopper wires 24. Since thecoating 22, which is a tungsten or tungsten based alloy coating, has good wear resistance characteristics, the coatedconductor 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. During an annealing process, 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 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 micron Ra lasted for 175 hours; the coated conductor rolls that were surface finished to about 5.5 microns Ra lasted for 325 hours; and the conductor rolls that were surface finished to 10 microns Ra lasted for about 900 hours. As evidenced from these data, 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 microns Ra.
- It will be understood that various changes in the details, materials and arrangement of parts which have been described herein may be made by those skilled in the art within the principle and scope of the invention as expressed in the claims. For example, an undercoat, such as nickel aluminum, may be applied prior to the tungsten or tungsten alloy top coat to provide corrosion protection for the substrate. In addition, a sealant, such as an epoxy, can be applied to the top coat to also provide corrosion protection for the substrate. Thus any material can be used as the substrate as long as it is sufficiently conductive to pass a desired current through the copper wire.
Claims (10)
- A conductive roll for use in annealing wire comprising a conductive substrate coated with a tungsten or tungsten based alloy layer and wherein the surface of the coated layer has a roughness of at least 2 microns Ra.
- The conductor roll of claim 1 wherein the surface of the coated layer has a roughness of at least 5 microns Ra.
- The conductor roll of claim 1 wherein the substrate is made of a conductive material selected from the group consisting of copper, bronze, nickel and steel.
- The conductor roll of claim 1 wherein the thickness of the tungsten or tungsten based alloy layer is from 50 to 150 microns thick.
- The conductor roll of claim 1 wherein an undercoat is disposed between the substrate and the tungsten or tungsten based alloy layer.
- The conductor roll of claim 5 wherein the undercoat is selected from the group consisting of nickel-aluminum and nickel.
- The conductor roll of claim 1 wherein a sealant is disposed over the tungsten or tungsten based alloy layer.
- The conductor roll of claim 7 wherein the sealant is epoxy.
- The conductor roll of claim 5 wherein the substrate is bronze, the undercoat is nickel-aluminum and the surface roughness of the tungsten or tungsten based alloy layer is at least 5 microns Ra.
- The conductor roll of claim 8 wherein the substrate is copper the sealant is epoxy and the surface roughness of the tungsten or tungsten based alloy layer is at least 5 microns Ra.
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 true EP0658635A1 (en) | 1995-06-21 |
EP0658635B1 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 (en) |
JP (1) | JP3065219B2 (en) |
CA (1) | CA2135510C (en) |
DE (1) | DE69417367T2 (en) |
ES (1) | ES2129098T3 (en) |
SG (1) | SG49600A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITUA20162154A1 (en) * | 2016-03-31 | 2017-10-01 | Sampsistemi S R L | RESISTANCE FILLING OVEN FOR THE ANNEALING OF AT LEAST ONE WIRE, ROPE, ROPE, VERGELLA OR METAL PLATE OR METALLIC ALLOY |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58116956A (en) * | 1981-12-29 | 1983-07-12 | Kawasaki Steel Corp | Roll for production of high silicon thin steel strip |
JPS58207390A (en) * | 1982-02-10 | 1983-12-02 | Mitsubishi Steel Mfg Co Ltd | Electrically conductive roll for electroplating |
EP0266509A1 (en) * | 1986-09-05 | 1988-05-11 | Kawasaki Steel Corporation | Apparatus for continuously annealing metal strip and hearth roll therefor |
JPH0234209A (en) * | 1988-07-21 | 1990-02-05 | Showa Alum Corp | Roll for cold rolling |
JPH04120297A (en) * | 1990-09-11 | 1992-04-21 | Satosen Co Ltd | Method for surface treatment of roll |
-
1994
- 1994-11-09 SG SG1996000642A patent/SG49600A1/en unknown
- 1994-11-09 ES ES94117700T patent/ES2129098T3/en not_active Expired - Lifetime
- 1994-11-09 CA CA 2135510 patent/CA2135510C/en not_active Expired - Fee Related
- 1994-11-09 JP JP6299105A patent/JP3065219B2/en not_active Expired - Fee Related
- 1994-11-09 EP EP19940117700 patent/EP0658635B1/en not_active Expired - Lifetime
- 1994-11-09 DE DE1994617367 patent/DE69417367T2/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58116956A (en) * | 1981-12-29 | 1983-07-12 | Kawasaki Steel Corp | Roll for production of high silicon thin steel strip |
JPS58207390A (en) * | 1982-02-10 | 1983-12-02 | Mitsubishi Steel Mfg Co Ltd | Electrically conductive roll for electroplating |
EP0266509A1 (en) * | 1986-09-05 | 1988-05-11 | Kawasaki Steel Corporation | Apparatus for continuously annealing metal strip and hearth roll therefor |
JPH0234209A (en) * | 1988-07-21 | 1990-02-05 | Showa Alum Corp | Roll for cold rolling |
JPH04120297A (en) * | 1990-09-11 | 1992-04-21 | Satosen Co Ltd | Method for surface treatment of roll |
Non-Patent Citations (4)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 14, no. 186 (M - 0962) 16 April 1990 (1990-04-16) * |
PATENT ABSTRACTS OF JAPAN vol. 16, no. 375 (C - 0973) 12 August 1992 (1992-08-12) * |
PATENT ABSTRACTS OF JAPAN vol. 7, no. 223 (M - 247) 4 October 1983 (1983-10-04) * |
PATENT ABSTRACTS OF JAPAN vol. 8, no. 52 (C - 213) 9 March 1984 (1984-03-09) * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITUA20162154A1 (en) * | 2016-03-31 | 2017-10-01 | Sampsistemi S R L | RESISTANCE FILLING OVEN FOR THE ANNEALING OF AT LEAST ONE WIRE, ROPE, ROPE, VERGELLA OR METAL PLATE OR METALLIC ALLOY |
WO2017168385A1 (en) * | 2016-03-31 | 2017-10-05 | Sampsistemi S.R.L. | Resistance annealing furnace to anneal at least one metal or metal alloy wire, strand, string, wire rod or strip |
Also Published As
Publication number | Publication date |
---|---|
JP3065219B2 (en) | 2000-07-17 |
JPH07197133A (en) | 1995-08-01 |
SG49600A1 (en) | 1998-06-15 |
CA2135510A1 (en) | 1995-05-11 |
EP0658635B1 (en) | 1999-03-24 |
DE69417367D1 (en) | 1999-04-29 |
ES2129098T3 (en) | 1999-06-01 |
CA2135510C (en) | 1999-09-21 |
DE69417367T2 (en) | 1999-08-26 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CA2302202C (en) | Electrode wire for use in electric discharge machining and process for preparing same | |
EP0522438A1 (en) | Wear resistant titanium nitride coating and methods of application | |
CN102756188B (en) | For welding wire and the manufacture method thereof of spark machined | |
CA2267621A1 (en) | Method of manufacturing porous electrode wire for electric discharge machining and structure of the electrode wire | |
KR102130346B1 (en) | Coating method of spray surface | |
EP0587709B1 (en) | Protection of metal surfaces against corrosion | |
Parkansky et al. | Development and application of pulsed-air-arc deposition | |
Patrick et al. | Understanding the process mechanisms is key to reliable resistance spot welding aluminum auto body components | |
CN112899605A (en) | Preparation method and application of tungsten carbide coating | |
Simão et al. | Hard chromium plating of EDT mill work rolls | |
CA2135510C (en) | Conductor roll | |
EP0549298A2 (en) | Flame sprayed composite coating | |
LT3340B (en) | Electrode for electrical discharge cutting of articles | |
CA1285782C (en) | Cylindrical freezing drum for slice ice making machines and a method of producing the drum | |
EP1283757B1 (en) | Electric discharge machining wire | |
Caiazzo et al. | Multilayer coatings based on CrN/Cr for molds of plastics | |
US4950563A (en) | Phosphoric acid fuel cells with improved corrosion resistance | |
Watanabe et al. | Fatigue cracks in HVOF thermally sprayed WC-Co coatings | |
DE4026607A1 (en) | METHOD FOR INCREASING THE LIFETIME OF A TOOL FOR SHELLING STRIPS AND WIRE MADE OF ALUMINUM | |
EP0321863B1 (en) | Mechanical plasting process | |
JP2739409B2 (en) | Manufacturing method of corrosion and wear resistant multilayer metal coating | |
Rudolphi et al. | On the use of ceramic PVD coatings to replace metallic coatings in electrical contacts | |
GB2076432A (en) | Cu-Ni coatings on ferrous substrates | |
US4750187A (en) | Graphitic electrode with protective coating | |
JPS5913252Y2 (en) | Electrode support member for electroplating |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): CH DE ES FR GB IT LI |
|
17P | Request for examination filed |
Effective date: 19950728 |
|
17Q | First examination report despatched |
Effective date: 19960425 |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
ITF | It: translation for a ep patent filed |
Owner name: BARZANO' E ZANARDO ROMA S.P.A. |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): CH DE ES FR GB IT LI |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: EP |
|
REF | Corresponds to: |
Ref document number: 69417367 Country of ref document: DE Date of ref document: 19990429 |
|
ET | Fr: translation filed | ||
REG | Reference to a national code |
Ref country code: CH Ref legal event code: NV Representative=s name: KIRKER & CIE SA |
|
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FG2A Ref document number: 2129098 Country of ref document: ES Kind code of ref document: T3 |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed | ||
REG | Reference to a national code |
Ref country code: GB Ref legal event code: IF02 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: CH Payment date: 20081125 Year of fee payment: 15 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: ES Payment date: 20081126 Year of fee payment: 15 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: IT Payment date: 20081127 Year of fee payment: 15 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20081117 Year of fee payment: 15 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20081223 Year of fee payment: 15 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20081128 Year of fee payment: 15 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20091109 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST Effective date: 20100730 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20091130 Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20091130 Ref country code: CH Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20091130 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20100601 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20091109 |
|
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FD2A Effective date: 20110325 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20091109 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: ES Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20110314 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: ES Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20091110 |