US20120064357A1 - Tyre bead wire and process for production thereof - Google Patents

Tyre bead wire and process for production thereof Download PDF

Info

Publication number
US20120064357A1
US20120064357A1 US13/319,252 US201013319252A US2012064357A1 US 20120064357 A1 US20120064357 A1 US 20120064357A1 US 201013319252 A US201013319252 A US 201013319252A US 2012064357 A1 US2012064357 A1 US 2012064357A1
Authority
US
United States
Prior art keywords
wire
diameter
wiredrawing
range
bead wire
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.)
Abandoned
Application number
US13/319,252
Other languages
English (en)
Inventor
Masatomo Kawashima
Hidetoshi Shibuya
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.)
Fuji Shoji Co Ltd
Original Assignee
Fuji Shoji Co Ltd
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 Fuji Shoji Co Ltd filed Critical Fuji Shoji Co Ltd
Assigned to FUJI SHOJI CO., LTD. reassignment FUJI SHOJI CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KAWASHIMA, MASATOMO, SHIBUYA, HIDETOSHI
Publication of US20120064357A1 publication Critical patent/US20120064357A1/en
Abandoned legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
    • B21C1/003—Drawing materials of special alloys so far as the composition of the alloy requires or permits special drawing methods or sequences
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C15/00—Tyre beads, e.g. ply turn-up or overlap
    • B60C15/04—Bead cores
    • 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
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
    • 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
    • C23C2/0224—Two or more thermal pretreatments
    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/024—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by cleaning or etching
    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/38—Wires; Tubes
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/009—Pearlite
    • 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
    • C21D9/34—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tyres; for rims
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913—Rod, strand, filament or fiber
    • Y10T428/2933—Coated or with bond, impregnation or core
    • Y10T428/2938—Coating on discrete and individual rods, strands or filaments

Definitions

  • the present invention relates to a tyre bead wire and a production process therefor used in producing bead cores made of carbon steel wires being reinforcements of automotive tyres.
  • Tyre bead wires are required to be tough and high in durability.
  • the tyre bead wires there have been used those which are 1.55 mm in diameter and equal to 1880 N/mm 2 or higher in tensile strength or those which are 0.94 mm in diameter and equal to 1840 N/mm 2 or higher in tensile strength.
  • the bead wires require a high tensile strength.
  • a high-carbon steel wire rod which is primarily 5.5 mm in diameter and has a carbon content in a range of 0.69-0.86 weight percents, and the bead wire rod is manufactured by being subjected to a wiredrawing process in which a total area-reduction rate is in a range of 92-97 percents or so.
  • the high-carbon steel wire rod is regulatively cooled after being hot-rolled if need be, and the resultant wire rod of pearlite structures having a diameter in a range of 5.5-6.5 mm is repetitively subjected to wiredrawing processes and patenting treatments to become a diameter in a range of 3.0-2.0 mm for a final wiredrawing.
  • the wire rod of this diameter after being subjected to the final wiredrawing, is then subjected to a bluing treatment and a plating treatment and is coiled, whereby there can be manufactured a steel cord that is usable as reinforcement in radial tyres, conveyor belts or the like.
  • Patent Document 1 describes a process for producing steel cords of this kind.
  • Patent Document 2 describes a process for performing a second wiredrawing process without performing an intermediate patenting treatment.
  • the temperature of the steel material is raised to sufficiently dry borax in the second wiredrawing process, so that the second wiredrawing process can be realized without suffering seizure and wire breaking.
  • the wire rod of the special wire diameter e.g., 5.0 mm or less in diameter
  • the wire rod of the special wire diameter which is small in production volume is required to be repetitively subjected to wiredrawing processes and patenting treatments, and this gives rise to problems that increase the cost for the material wire rod and thus, the production cost for bead wires and hence, for tyres.
  • the present invention has been made in order to solve the foregoing problems in the prior art, and an object thereof is to provide a tyre bead wire and a production process for the same which are capable of employing a carbon steel wire rod having a general-purpose wire diameter whose carbon content in weight percent is in a range of 0.61% or more to 0.65% or less, and of wiredrawing the rod to a predetermined final wiredrawing diameter suitable for bead wires through one process without performing a patenting treatment.
  • the feature of the invention in a tyre bead wire according to Claim 1 resides in that a carbon steel wire rod containing carbon in a range of 0.61% or more to 0.65% or less in weight percent and having a diameter in a range of 5.5 mm to 6.5 mm is wiredrawn through one wiredrawing process to a predetermined final wiredrawing diameter with a true strain in a range of 2.0 to 4.0 and is turned to pearlite structures in which ferrite and cementite are drawn in parallel with an interval therebetween made to be narrow.
  • the feature of the invention in the tyre bead wire according to Claim 2 resides in that in Claim 1 , the one wiredrawing process results in wiredrawing to a diameter in a range of 0.94 mm to 1.30 mm.
  • the feature of the invention in a tyre bead wire production process according to Claim 3 resides in that a carbon steel wire rod containing carbon in a range of 0.61% or more to 0.65% or less in weight percent and having a diameter in a range of 5.5 mm to 6.5 mm is wiredrawn through one process to a predetermined final wiredrawing diameter with a true strain in a range of 2.0 to 4.0 and that the wire rod after the wiredrawing is blued and then, is plated.
  • the feature of the invention in the tyre bead wire production process according to Claim 4 resides in that in Claim 3 , the carbon steel wire rod being 5.5 mm in diameter is wiredrawn to a final wiredrawing diameter in a range of 0.94 to 1.30 mm.
  • the feature of the invention in the tyre bead wire production process according to Claim 5 resides in that in Claim 3 , the carbon steel wire rod being 6.5 mm in diameter is wiredrawn to a final wiredrawing diameter in a range of 1.5 to 2.20 mm.
  • the carbon steel wire rod containing carbon in the range of 0.61% or more to 0.65% or less in weight percent and having the diameter in the range of 5.5 mm to 6.5 mm is wiredrawn through one wiredrawing process to the predetermined final wiredrawing diameter with the true strain in the range of 2.0 to 4.0 and is turned to the pearlite structures in which ferrite and cementite are drawn in parallel with the interval therebetween made to be narrow.
  • the carbon steel wire rod of a general-purpose diameter is employed, it can be realized to obtain a useful tyre bead wire which is superior in tensile strength, is excellent in adhesion of the bead wire to surrounding rubber, and does not bring about the breaking of wire during the wiredrawing and the breaking of wire at welded parts thereof.
  • the carbon steel wire rod containing carbon in the range of 0.61% or more to 0.65% or less in weight percent and having the diameter in the range of 5.5 mm to 6.5 mm is wiredrawn through one process to the predetermined final wiredrawing diameter with the true strain in the range of 2.0 to 4.0. Therefore, it becomes possible to wiredraw the carbon steel wire rod of the relatively low carbon content at the high area-reduction rate without a patenting treatment and to wiredraw the carbon wire rod of the general-purpose wire diameter (5.5-6.5 mm diameter) through the one process to the final wiredrawing diameter suitable for bead wire without bringing about the breaking of the wire but with a required tensile strength secured.
  • the carbon wire rod is low in carbon content to be softened, the workability in wiredrawing the carbon steel wire rod can be improved, and the productivity can be enhanced. Further, in continuously wiredrawing the wire rod, it becomes easier to perform a welding at the time of welding material wires which welding is required in a continuous production by using a material wire in use and another material wire to be used next, and the breaking of wire at the welded portion is made to be hard to occur.
  • FIG. 1 is a view illustrating the layers of ferrite and cementite having been drawn in parallel by wiredrawing.
  • FIG. 2 is a chart of an embodiment showing production processes in a tyre bead wire production process of the present invention.
  • FIG. 3 is photos of the surfaces of bead wires in the state that plated surface layers are removed from the bead wires which are manufactured as shown in FIG. 2 .
  • Bead wires for vehicle tyres are required to be tough and high in durability.
  • the strength of a bead wire can be intensified by wiredrawing and thinning in wire diameter a wire rod which has fine pearlite structures (2-phase structure of ferrite (Fe) and cementite (Fe 3 C)) and which has been subjected to a patenting treatment.
  • Tyres which employ bead cores produced by using the bead wire made of such a wire rod can contribute to requirements for high strength, high toughness and light weight. This is because, as shown in FIG.
  • the wiredrawing process causes the crystals of high strength cementite (Fe 3 C) and ferrite (Fe) to be drawn and to be oriented in parallel in the wiredrawing direction, so that the width of ferrite phases is narrowed to increase the strength. And, the thinner the wiredrawing process makes the wire diameter, the higher the strength becomes.
  • the wire diameter to which the wire rod can be fined by one wiredrawing process is restrained as a matter of course. For this reason, in order to attain a desired wire diameter, it is required to carry out, after a wiredrawing process to a predetermined wire diameter, a patenting treatment to return the wire rod again to fine pearlite structures suitable for wiredrawing, and then to carry out another wiredrawing process again.
  • a bluing treatment is carried out at a temperature in a range of 380 to 480° C.
  • a small-diameter material wire of, for example, 4.0 mm or 4.5 mm in wire diameter can be used in order to make the equipment for the patenting treatment unnecessary and in order to wiredraw a wire rod through one wiredrawing process to a desired wire diameter (2.20-0.94 in diameter) suitable for bead wire.
  • material wires of the special diameter must be obtained from steel manufacturers.
  • a wire rod being a carbon steel whose carbon content is in a range of 0.61-0.65 in weight percent and is lower than the carbon content of the prior at wire rod, and having a wire diameter in a range of 5.5-6.5 mm is wiredrawn through one process to a predetermined final wiredrawing diameter (2.20-0.94 mm diameter) suitable for bead wire without being subjected to a patenting treatment.
  • a predetermined final wiredrawing diameter 2.20-0.94 mm diameter
  • FIG. 2 shows a production process for bead wire.
  • a carbon steel (wire rod) having a wire diameter in a range of 5.5-6.5 mm and a carbon content in a range of 0.61-0.65 in weight percent is uncoiled from a coiler ( 10 ) and has an oxide film on the surface removed by a descaling device ( 11 ). Then, the carbon steel is made to pass through a coating liquid adhesion device to adhere a coating liquid on the surface of the wire rod ( 12 ) and is dried.
  • the wire rod is wiredrawn by serially arranged dry wiredrawing devices 30 through one process to a predetermined final wiredrawing diameter (2.20-0.94 mm diameter) with a true strain in a range of 2.0-4.0 (13) and is coiled by a coiler ( 14 ).
  • the final wiredrawing diameter which is to be obtained by the wiredrawing through one process is preferably in a range of 0.94-1.30 mm diameter or so, and in the case of the wire diameter being 6.5 mm, the final wiredrawing diameter which is to be obtained by the wiredrawing through one process is preferably in a range of 1.5-2.20 mm diameter or so.
  • the wire rod which has been wiredrawn to the final wiredrawing diameter is uncoiled from the coiler ( 20 ) and then, is subjected to a bluing treatment by a bluing treatment device ( 21 ). And, the wire rod is plated by a plating treatment device ( 22 ) and is coiled by a coiler ( 23 ), whereby a tyre bead wire is produced.
  • the adhesion force between a bead wire and rubber is determined in dependence on a chemical bonding force brought about by a chemical reaction between the rubber and the plated layer on the surface of the bead wire and a physical bonding force of an anchor effect to wrinkles (unevenness) on the surface of the bead wire. Therefore, although being limitative, the anchor effect, when increased, makes it possible to go up the adhesion force. Particularly, the physical bonding force by the anchor effect is effective where a tyre is subjected to a high temperature, a high moisture and repetitive strains due to a hard travelling which causes the adhesive interface between the rubber and the surface of the bead wire to deteriorate and raises the rate at which the boundary surface is exposed.
  • a hard steel wire rod of 5.5 mm in wire diameter prescribed by JIS (Japanese Industrial Standards) G3506 SWRH62A was used as a material wire rod.
  • the chemical components were C: 0.63%, Si: 0.21% and Mn: 0.52%, and the remainder thereof was Fe and inevitable impurities.
  • An oxide film on the surface of the material rod was removed by a descaling device, and then, the material rod was made to pass through a coating liquid adhesion device, whereby a coating liquid was adhered to the surface of the wire rod and was dried.
  • the wire rod was reduced in area through one wiredrawing process to a predetermined wire diameter being 1.20 mm diameter with a true strain in a range of 2.0-4.0.
  • the drawn wire rod was coiled by a coiler in the form of a coil, and the coiled wire rod was uncoiled to be subjected to a bluing by being made to pass through a bath held at a temperature of 430° C. and then, to a plating treatment, whereby a bead wire was produced.
  • a hard steel wire rod of 5.5 mm in wire diameter prescribed by JIS G3506 SWRH72A was used as a material wire rod.
  • the chemical components were C: 0.71%, Si: 0.22% and Mn: 0.49%, and the remainder thereof was Fe and inevitable impurities.
  • An oxide film on the surface of the material rod were removed by the descaling device, and then, the material rod was made to pass through the coating liquid adhesion device, whereby the coating liquid was adhered to the surface of the wire rod. Thereafter, by the dry wiredrawing devices arranged in series, the wire rod was reduced in area through one wiredrawing process to the predetermined wire diameter being 1.20 mm diameter.
  • the drawn wire rod was coiled by the coiler in the form of a coil, and the coiled wire rod was uncoiled to be subjected to the bluing by being made to pass through the bath held at the temperature of 430° C. and then, to the plating treatment, whereby a bead wire was produced.
  • a hard steel wire rod of 4.5 mm in wire diameter prescribed by JIS G3506 SWRH72A was used as a material wire rod.
  • the chemical components were C: 0.72%, Si: 0.21% and Mn: 0.51%, and the remainder thereof was Fe and inevitable impurities.
  • An oxide film on the surface of the material rod was removed by the descaling device, and then, the material rod was made to pass through the coating liquid adhesion device, whereby the coating liquid was adhered to the surface of the wire rod. Thereafter, by the dry wiredrawing devices arranged in series, the wire rod was reduced in area through one wiredrawing process to the predetermined wire diameter being 1.20 mm diameter.
  • the drawn wire rod was coiled by the coiler in the form of a coil, and the coiled wire rod was uncoiled to be subjected to the bluing by being made to pass through the bath held at the temperature of 430° C. and then, to the plating treatment, whereby a bead wire was produced.
  • the wire rod with a sufficient tensile strength (2200 N/mm 2 ) was able to be obtained, but the wire rod could not be drawn smoothly as a result that the high carbon steel of the wire diameter 5.5 mm having a large carbon content was reduced in surface to the 1.2 mm wire diameter through one process being a heavy process.
  • the breaking of the wire took place at many portions thereon during the wiredrawing.
  • the wire rod had considerable changes in structure at the portions which were heated at a high temperature during the welding, whereby the breaking of the wire also took place at many welded portions.
  • the carbon steel wire rod of the special wire diameter (4.5 mm) is required, and in order to obtain the carbon steel wire rod of the 4.5 mm wire diameter by the bead wire manufacture itself, an equipment is required that carries out a patenting treatment on a carbon steel wire rod for general purpose (5.5-6.5 mm diameter) purchased from a steel manufacturer. Where the bead wire manufacturer does not have the equipment, there is a constraint that the manufacturer has to obtain expensive material wires from a steel manufacturer.
  • the processing quantity was increased in comparison with, for example, the wiredrawing in compared example 2 that was carried out to make the wire rod from the 4.5 mm wire diameter to the 1.20 mm wire diameter.
  • the wire rod after the wiredrawing was turned to pearlite structures in which ferrite and cementite were drawn in parallel with a narrow interval therebetween and with fine and smooth structures.
  • FIG. 3 show in an enlarged scale the surfaces of the bead wires in the state that plated layers were removed from the surfaces of the bead wires each produced as shown in FIG. 2 .
  • the anchor effect of its adhesion to rubber is influenced by groove intervals of wrinkles (unevenness) which are generated with an increase in surface area resulting from a decrease in diameter brought about by the wiredrawing.
  • FIG. 3 shows the surface of the bead wire produced in the aforementioned embodiment 1
  • (B) shows the surface of the bead wire produced in the aforementioned compared example 1
  • C shows the surface of the bead wire produced in the aforementioned compared example 2.
  • Embodiment 1 had results that were better than those of compared examples 1 and 2 in both of an initial adhesion property before the aging and a waterproof adhesion property representing tyres that had traveled after the aging.
  • compared example 2 had an inferior result in the waterproof adhesion property. From this, it was backed up that those in embodiment 1 and compared example 1 had the groove intervals being excellent in anchor effect in comparison with that in compared example 2.
  • the tests for adhesive forces were carried out based on the rubber adhesion testing method prescribed in JIS G3510. Embedded rubber of a conventional composition noted below was used as bead insulation. The numerals show ratios in mass. The ratios are natural rubber 50, SBR 50, carbon black 100 (SEAST® SO, manufactured by TOKAI CARBON CO., LTD.), softening agent 25, calcium carbonate 25, talc 10, stearic acid 2, zinc oxide 5, sulfur 8, and vulcanization accelerator 1.
  • the vulcanization condition for the initial adhesion properties was for 40 minutes at 150° C., and the waterproof adhesion properties were evaluated by the aforementioned drawing adhesion tests after leaving the vulcanized samples in an atmosphere of 70° C. and 95% RH for one week. A condition in which tyres deteriorate due to heat after traveling was assumed for the waterproof adhesion properties.
  • the foregoing embodiment has been described taking the example that the hard steel wire rod of 5.5 mm in wire diameter having the chemical components of C: 0.63%, Si: 0.21%, Mn: 0.52%, and the remainder containing Fe and inevitable impurities was reduced in area through one wiredrawing process to the 1.20 mm wire diameter with the true strain in the range of 2.0 ⁇ 4.0. And, almost the same effects as the forgoing embodiment 1 can be obtained in the case that a hard steel wire rod of 6.5 mm in wire diameter having the chemical components of C: 0.63%, Si: 0.21%, Mn: 0.52%, and the remainder containing Fe and inevitable impurities is reduced in area through one wiredrawing process to 1.55 mm wire diameter.
  • the carbon steel wire rod containing carbon in the range of 0.61% or more to 0.65% or less in weight percent and having the diameter in the range of 5.5mm to 6.5 mm is wiredrawn through one wiredrawing process to the predetermined final wiredrawing diameter with the true strain in the range of 2.0 ⁇ 4.0, so that the wire rod is turned to pearlite structures in which ferrite and cementite have been drawn in parallel with a narrow interval therebetween.
  • the carbon steel wire of the diameter for general purpose is used, it is possible to obtain a useful tyre bead wire which is superior in tensile strength, is excellent in adhesion force of the bead wire to surrounding rubber, and does not bring about the breaking of wire during the wiredrawing and the breaking of wire at welded portions.
  • the carbon steel of the low carbon content at the high area-reduction rate it is possible to realize the bead wire of the pearlite structures in which ferrite (Fe) and cementite (Fe 3 C) are drawn in parallel with the narrow interval therebetween and with the structures being fine and smooth.
  • the carbon steel wire rod containing carbon in the range of 0.61 or more to 0.65 or less in weight percent and having the diameter in the range of 5.5 mm to 6.5 mm is wiredrawn through one process to the predetermined final wiredrawing diameter with the true stress in the range of 2.0-4.0, it can be realized to wiredraw the carbon steel wire rod of the relatively low carbon content at the high area-reduction rate without a patenting treatment.
  • the tyre bead wire and the production process therefor according to the present invention are suitable to obtain bead wires used in producing bead cores which are reinforcement of automotive tyres.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Ropes Or Cables (AREA)
  • Metal Extraction Processes (AREA)
  • Tires In General (AREA)
US13/319,252 2009-06-05 2010-05-26 Tyre bead wire and process for production thereof Abandoned US20120064357A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2009136252 2009-06-05
JP2009-136252 2009-06-05
PCT/JP2010/058916 WO2010140521A1 (ja) 2009-06-05 2010-05-26 タイヤ用ビードワイヤおよびその製造方法

Publications (1)

Publication Number Publication Date
US20120064357A1 true US20120064357A1 (en) 2012-03-15

Family

ID=43297657

Family Applications (1)

Application Number Title Priority Date Filing Date
US13/319,252 Abandoned US20120064357A1 (en) 2009-06-05 2010-05-26 Tyre bead wire and process for production thereof

Country Status (6)

Country Link
US (1) US20120064357A1 (ja)
JP (1) JPWO2010140521A1 (ja)
KR (1) KR20120024609A (ja)
CN (1) CN102449179A (ja)
DE (1) DE112010002252T5 (ja)
WO (1) WO2010140521A1 (ja)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120103044A1 (en) * 2009-07-27 2012-05-03 Fuji Shoji Co., Ltd. Bead wire manufacturing method and manufacturing apparatus
US9566753B2 (en) 2012-06-12 2017-02-14 Fuji Seiko Co., Ltd. and Fuji Shoji Co., Ltd. Winding apparatus
EP3620574A4 (en) * 2017-05-02 2021-02-24 The Yokohama Rubber Co., Ltd. BEAD RING AND METHOD OF MANUFACTURING THEREOF
CN114836685A (zh) * 2022-04-08 2022-08-02 江苏胜达科技有限公司 新能源轿车子午线轮胎用胎圈钢丝及其生产工艺

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103357694A (zh) * 2013-07-25 2013-10-23 张家港市胜达钢绳有限公司 一种胎圈钢丝的生产方法
CN105483556B (zh) * 2015-12-24 2017-10-10 江苏兴达钢帘线股份有限公司 一种高强度胎圈钢丝材料强化方法及胎圈钢丝的制备方法
CN114589952A (zh) * 2022-02-24 2022-06-07 江苏兴达钢帘线股份有限公司 一种胎圈钢丝及制造方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6264759B1 (en) * 1998-10-16 2001-07-24 Pohang Iron & Steel Co., Ltd. Wire rods with superior drawability and manufacturing method therefor

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3182984B2 (ja) 1993-06-22 2001-07-03 株式会社神戸製鋼所 高強度極細鋼線の製法
JP3499341B2 (ja) * 1995-05-29 2004-02-23 株式会社神戸製鋼所 ゴム補強用鋼線の製造方法
JP3305555B2 (ja) * 1995-12-13 2002-07-22 住友電気工業株式会社 炭素鋼線材
JP4393467B2 (ja) * 2006-02-28 2010-01-06 株式会社神戸製鋼所 強伸線加工用の熱間圧延線材およびその製造方法
JP2008284581A (ja) 2007-05-16 2008-11-27 Kobe Steel Ltd 線材の製造方法および伸線設備

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6264759B1 (en) * 1998-10-16 2001-07-24 Pohang Iron & Steel Co., Ltd. Wire rods with superior drawability and manufacturing method therefor

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Machine-English translation of Japanese patent No. 09-049018, Shikaiso Masato et al., February 18, 1997 *
Machine-English translation of Japanese patent No. 10-080716, Nakamura Kenichi et al., March 31, 1998 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120103044A1 (en) * 2009-07-27 2012-05-03 Fuji Shoji Co., Ltd. Bead wire manufacturing method and manufacturing apparatus
US9566753B2 (en) 2012-06-12 2017-02-14 Fuji Seiko Co., Ltd. and Fuji Shoji Co., Ltd. Winding apparatus
EP3620574A4 (en) * 2017-05-02 2021-02-24 The Yokohama Rubber Co., Ltd. BEAD RING AND METHOD OF MANUFACTURING THEREOF
CN114836685A (zh) * 2022-04-08 2022-08-02 江苏胜达科技有限公司 新能源轿车子午线轮胎用胎圈钢丝及其生产工艺

Also Published As

Publication number Publication date
JPWO2010140521A1 (ja) 2012-11-15
WO2010140521A1 (ja) 2010-12-09
KR20120024609A (ko) 2012-03-14
DE112010002252T5 (de) 2012-12-06
CN102449179A (zh) 2012-05-09

Similar Documents

Publication Publication Date Title
US20120064357A1 (en) Tyre bead wire and process for production thereof
JP4619968B2 (ja) カーカス固定用周方向ケーブルを有するタイヤと、そのケーブルの製造方法
KR102081525B1 (ko) 고강도 중공 스테빌라이져용 전봉 강관, 고강도 중공 스테빌라이져용 전봉 강관의 제조 방법, 고강도 중공 스테빌라이져, 및 고강도 중공 스테빌라이져의 제조 방법
KR20210049190A (ko) 고신장률 스틸 코드 및 상기 코드를 포함하는 공압 타이어
JP2010270391A (ja) 延性に優れた高強度鋼線用線材及び鋼線並びにその製造方法
CN103357694A (zh) 一种胎圈钢丝的生产方法
CN110832096A (zh) 高强度钢丝
US20160281297A1 (en) Drawing Method And Wire Produced By Said Drawing Method
JP3542489B2 (ja) 疲労特性の優れた高強度極細鋼線
EP3710286B1 (en) A steel cord for rubber reinforcement
RU2746613C1 (ru) Стальная проволока, для которой необходима прямолинейность, и способ ее изготовления
US9987881B2 (en) Steel wire with high drawability having a carbon level by mass of between 0.05% inclusive and 0.4% exclusive
JP3267833B2 (ja) 疲労特性の優れた高強度極細鋼線およびその製造方法
JP6149711B2 (ja) 極細鋼線用線材及びその製造方法
KR102184704B1 (ko) 직선 품질이 우수한 강선 및 이의 제조방법
US20170321293A1 (en) Carbon steel wire and method for manufacturing same
EP3783121A1 (en) Steel wire having excellent straightness quality and method for manufacturing same
KR20000042090A (ko) 타이어 비드부 보강용 인덴티드 강선
JP2000071724A (ja) 空気入りタイヤ
EP4343055A1 (en) Steel cord for reinforcing tire belt plies
JP5124113B2 (ja) 金属線材の延性回復方法
US10787721B2 (en) Drawing process and wire obtained by drawing process
JP2017141494A (ja) 強度と延性のバランスに優れた高強度極細鋼線
JP3108205B2 (ja) 大型ラジアルタイヤ
JPH09195189A (ja) ビードワイヤ

Legal Events

Date Code Title Description
AS Assignment

Owner name: FUJI SHOJI CO., LTD., JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KAWASHIMA, MASATOMO;SHIBUYA, HIDETOSHI;SIGNING DATES FROM 20111012 TO 20111014;REEL/FRAME:027200/0003

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION