WO2009113641A1 - 環状同芯撚りビードコード、その製造方法、及び車両用タイヤ - Google Patents
環状同芯撚りビードコード、その製造方法、及び車両用タイヤ Download PDFInfo
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- WO2009113641A1 WO2009113641A1 PCT/JP2009/054811 JP2009054811W WO2009113641A1 WO 2009113641 A1 WO2009113641 A1 WO 2009113641A1 JP 2009054811 W JP2009054811 W JP 2009054811W WO 2009113641 A1 WO2009113641 A1 WO 2009113641A1
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- WIPO (PCT)
- Prior art keywords
- bead cord
- annular
- annular concentric
- concentric stranded
- diameter
- Prior art date
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- 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
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/0007—Reinforcements made of metallic elements, e.g. cords, yarns, filaments or fibres made from metal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/48—Bead-rings or bead-cores; Treatment thereof prior to building the tyre
-
- 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
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B1/00—Constructional features of ropes or cables
- D07B1/06—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
- D07B1/0606—Reinforcing cords for rubber or plastic articles
- D07B1/062—Reinforcing cords for rubber or plastic articles the reinforcing cords being characterised by the strand configuration
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B7/00—Details of, or auxiliary devices incorporated in, rope- or cable-making machines; Auxiliary apparatus associated with such machines
- D07B7/16—Auxiliary apparatus
- D07B7/162—Vices or clamps for bending or holding the rope or cable during splicing
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B7/00—Details of, or auxiliary devices incorporated in, rope- or cable-making machines; Auxiliary apparatus associated with such machines
- D07B7/16—Auxiliary apparatus
- D07B7/165—Auxiliary apparatus for making slings
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2001—Wires or filaments
- D07B2201/201—Wires or filaments characterised by a coating
- D07B2201/2011—Wires or filaments characterised by a coating comprising metals
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2015—Strands
- D07B2201/2021—Strands characterised by their longitudinal shape
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2015—Strands
- D07B2201/2023—Strands with core
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2015—Strands
- D07B2201/2038—Strands characterised by the number of wires or filaments
- D07B2201/2039—Strands characterised by the number of wires or filaments three to eight wires or filaments respectively forming a single layer
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2047—Cores
- D07B2201/2051—Cores characterised by a value or range of the dimension given
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2047—Cores
- D07B2201/2052—Cores characterised by their structure
- D07B2201/2059—Cores characterised by their structure comprising wires
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2047—Cores
- D07B2201/2052—Cores characterised by their structure
- D07B2201/2065—Cores characterised by their structure comprising a coating
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2047—Cores
- D07B2201/2066—Cores characterised by the materials used
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2205/00—Rope or cable materials
- D07B2205/30—Inorganic materials
- D07B2205/3021—Metals
- D07B2205/3025—Steel
- D07B2205/3046—Steel characterised by the carbon content
- D07B2205/305—Steel characterised by the carbon content having a low carbon content, e.g. below 0,5 percent respectively NT wires
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2205/00—Rope or cable materials
- D07B2205/30—Inorganic materials
- D07B2205/3021—Metals
- D07B2205/3025—Steel
- D07B2205/3046—Steel characterised by the carbon content
- D07B2205/3053—Steel characterised by the carbon content having a medium carbon content, e.g. greater than 0,5 percent and lower than 0.8 percent respectively HT wires
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2205/00—Rope or cable materials
- D07B2205/30—Inorganic materials
- D07B2205/3021—Metals
- D07B2205/3085—Alloys, i.e. non ferrous
- D07B2205/3089—Brass, i.e. copper (Cu) and zinc (Zn) alloys
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- 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
- Y10T152/00—Resilient tires and wheels
- Y10T152/10—Tires, resilient
- Y10T152/10495—Pneumatic tire or inner tube
- Y10T152/10819—Characterized by the structure of the bead portion of the tire
Definitions
- the present invention relates to an annular concentric stranded bead cord embedded in a bead portion of a pneumatic tire, a manufacturing method thereof, and a vehicle tire.
- a bead cord embedded in a bead portion of a pneumatic tire generally has a sheath layer in which a side wire made of a steel wire thinner than the core is wound around an annular core wire of a mild steel wire, but ensures strength.
- a hardened steel wire with the same diameter is twisted into a plurality of layers (for example, see Patent Document 1), and a sheath made of a steel wire around the annular core wire is made of synthetic resin.
- a wire is wound in a spiral shape is known (for example, see Patent Document 2).
- the bead cord of Patent Document 1 has a structure in which a hard steel wire having the same diameter is twisted into a plurality of layers without using an annular core wire, so that the shape is unstable and it is difficult to automate the manufacture. Moreover, only the weight reduction by replacing an annular core wire with a thin hard steel wire could be expected. Moreover, although the annular core is welded with both ends abutted, the hardened steel wire is likely to have a hard and brittle quenched structure. It also requires a work.
- annular concentric stranded bead cord having a sheath layer made of a metal side wire is not subjected to prior three-dimensional typing that assumes the diameter of the core (annular core) and the winding pitch, such as a non-annular wire rope. It was. The reason is that the following adverse effects (1) to (3) can be expected to occur by performing three-dimensional typing in advance. (1) If the preliminarily imparted molding shape does not completely match the actual winding pitch, a gradual shift occurs during winding, creating a gap between the annular core and the side line, resulting in twisting disturbance.
- the side wire diameter utilization rate is set to 95% or more to improve the side wire strength utilization rate.
- the annular concentric stranded bead cord was not subjected to prior shaping, and was slightly damaged by being wound around the annular core. Therefore, the diameter shaping ratio of the side wire was less than 10%. It was. Therefore, the strength utilization rate as a cord is low, and it is necessary to expect an excessive safety factor when used as a reinforcing material for a tire. Since the diameters of the annular core and the side line are increased, the weight reduction is prevented.
- an object of the present invention is to provide an annular concentric stranded bead cord, a manufacturing method thereof, and a vehicle tire that can achieve weight reduction while ensuring strength.
- annular concentric stranded bead cord of the present invention that can solve the above-mentioned problems is an annular concentric stranded bead cord in which a side line is spirally wound around an annular core to form one or more sheath layers.
- the diameter-type attachment ratio of the side line is 20% or more and 105% or less.
- the diameter type attachment ratio of the side line wound around the annular core is 20% or more and 105% or less, the strength utilization ratio of the side line can be improved. As a result, it is not necessary to expect an excessive safety factor when used as a tire reinforcing material, and even if the diameters of the annular core and the side wires are reduced, the strength can be ensured and the weight can be reduced. Even if the diameter mold attachment ratio exceeds 100%, the rubber penetrates into the gap between the annular core and the side line. Therefore, if the diameter mold attachment ratio is 105% or less, the strength utilization ratio of the annular core and the side line is greatly reduced. Absent.
- the ratio of the diameter mold is defined as D being the diameter of the annular concentric stranded bead cord (annular core + cross-sectional diameter (wire diameter) of the sheath layer) and H being the wave height (including self-diameter) of the side line.
- D the diameter of the annular concentric stranded bead cord
- H the wave height (including self-diameter) of the side line.
- annular concentric twist bead cord of this invention which can solve the said subject is the cyclic
- the annular concentric stranded bead cord is annealed and subjected to a die-molding treatment so that the diameter shaping rate of the side wire is 20% or more and 105% or less.
- the strength utilization factor of the side line can be improved. As a result, it is not necessary to expect an excessive safety factor when used as a tire reinforcing material, and even if the diameters of the annular core and the side wires are reduced, the strength can be ensured and the weight can be reduced. Even if the diameter mold attachment ratio exceeds 100%, the rubber penetrates into the gap between the annular core and the side line.
- the diameter mold attachment ratio is 105% or less, the strength utilization ratio of the annular core and the side line is greatly reduced. Absent.
- the winding pitch when winding the side wire can be set to a desired value, and the winding tension can be stabilized, so that the operation of winding the side line can be performed smoothly. Can be manufactured easily.
- a diameter molding rate of the side wire is less than 20%.
- the winding pitch at the time of winding a side wire around an annular core can be made into a desired value, and winding tension can be stabilized. Therefore, the operation of forming the sheath layer can be performed smoothly, and manufacturing is easy.
- annealing exceeding a heating amount (temperature ⁇ time) necessary for vulcanization when the tire is molded by being embedded in rubber of a vehicle tire is performed.
- a heating amount (temperature ⁇ time) necessary for vulcanization when the tire is molded by being embedded in rubber of a vehicle tire is performed.
- the molding process is performed under a reduced pressure inert gas atmosphere in an environment of 180 ° C. or higher and 320 ° C. or lower for 5 minutes or longer. It is preferable to perform annealing for 120 minutes or less. Considering the melting point of zinc contained in brass, the annealing temperature of the mold forming process is suitably 320 ° C. or less. In addition, since the heating amount necessary for vulcanization when molding a tire is 170 ° C. ⁇ 15 minutes even under high temperature conditions, strength improvement by age hardening can be expected at an annealing temperature of 180 ° C. or higher.
- the volume to be heated is smaller than the vulcanization time when the tire is molded, even if the annealing time of the bead cord is 5 minutes, it can be annealed sufficiently uniformly.
- the molding treatment is performed in an atmosphere of 180 ° C. or more and 380 ° C. or less in a reduced-pressure inert gas atmosphere for 5 minutes. It is preferable to perform annealing for not less than 120 minutes.
- the annealing temperature of the molding process exceeds 350 ° C., the strength of the side line itself tends to decrease, but since the molding rate of the side line increases as the temperature rises, the strength utilization factor that these two characteristics affect does not decrease
- the critical annealing temperature is about 380 ° C. Similarly to the above, even if the annealing time of the bead cord is 5 minutes, it can be annealed sufficiently uniformly.
- the annular concentric stranded bead cord of the present invention or the annular concentric stranded bead cord manufactured by the method of manufacturing the annular concentric stranded bead cord of the present invention is embedded. It is characterized by.
- annular concentric stranded bead cord which is lightened while ensuring strength is used, an eco-tire that is easy to manufacture and lightened can be realized.
- an annular concentric stranded bead cord a manufacturing method thereof, and a vehicle tire that can achieve weight reduction while ensuring strength.
- (A) is a general view of a bead cord
- (b) is a perspective view showing a portion of a bead cord.
- (a) is a side view of a test jig
- (b) is sectional drawing of a test jig.
- SYMBOLS 1 Vehicle tire, 2 ... Bead cord (annular concentric twist bead cord), 11 ... Circular core, 12 ... Side line, 13 ... Sheath layer, D ... Diameter of bead cord, H ... Wave height of side line after molding
- FIG. 1 is a sectional view of a tire for a vehicle
- FIG. 2A is an overall view of an annular bead cord
- FIG. 2B is a perspective view showing a portion of the annular bead cord
- FIG. 3 is a sectional view of the annular bead cord.
- FIG. 4 is a side view of the side line.
- a vehicle tire 1 is a pneumatic tire for passenger cars, and bead portions 3 on both sides through which bead cords (annular concentric stranded bead cords) 2 pass and tire radial directions from the bead portions 3.
- a sidewall portion 4 extending outward and a tread portion 5 connecting between upper ends thereof are provided.
- a carcass 6 is bridged between the bead portions 3, and a belt layer 7 is wound in the circumferential direction outside the carcass 6 and inside the tread portion 5.
- the bead cord 2 passed through the bead portion 3 of the vehicle tire 1 has a plurality of (six in this example) side lines around the annular core 11. 12 is provided, and the side line 12 is passed through the ring from the outside of the ring of the annular core 11 and again through the ring from the outside of the ring, whereby the side line 12 is passed through the ring core 11. Is spirally wound at a predetermined winding pitch.
- the sheath layer 13 of one layer is illustrated.
- the annular core 11 is formed by bending a single wire into an annular shape and joining both end faces thereof by butt welding. In this case, it can be simply joined without causing an increase in the diameter of the joining portion of the wires of the annular core 11.
- the annular core 11 is made of an alloy steel wire, and its material is 0.08 to 0.27 mass% carbon (C), 0.30 to 2.00 mass% silicon (Si), 0.50. Containing 2.00% by mass manganese (Mn) and 0.20-2.00% by mass chromium (Cr), and aluminum (Al), niobium (Nb), titanium (Ti) and vanadium (V) Is an alloy steel composed of at least one kind in the range of 0.001 to 0.100% by mass, the balance being iron (Fe) and inevitably mixed impurities. If it is such a composition, the ductile fall suppression effect in the welding part of both ends at the time of forming an alloy steel wire annularly and making it the cyclic
- the annular core 11 may be formed of a medium carbon steel wire containing 0.28 to 0.56 mass% of carbon (C). Even if a wire made of such a material is used, the weldability of the joint is improved, so that the strength required for the annular core 11 can be ensured.
- the surface of the annular core 11 may be subjected to a copper alloy (for example, brass) or zinc plating treatment.
- the side wire 12 is made of, for example, a high carbon steel wire containing 0.7% by mass or more of carbon (C). Note that the surface of the side wire 12 may be subjected to a copper alloy (for example, brass) or zinc plating treatment.
- the diameter (wire diameter) of the wire constituting the annular core 11 is preferably equal to or larger than the diameter (wire diameter) of the wire of the side wire 12.
- the diameter of the wire of the annular core 11 is 1.5 mm.
- the diameter of the wire is 1.4 mm.
- FIG. 3 is a conceptual diagram showing an apparatus for producing an annular concentric stranded bead cord for pendulum movement of an annular core
- FIG. 4 is a conceptual diagram showing a state of pendulum movement of the apparatus of FIG.
- the manufacturing apparatus shown in FIGS. 3 and 4 includes a driving unit 30 that rotates the annular core 1 in the circumferential direction, and a supply unit 41 of the side line 12 that supplies the side line 12 wound around the reel 33 to the winding portion of the annular core 11.
- the driving unit 30 has two pinch rollers 32a and 32b that are installed on an arcuate holding arm 31 and connected to a drive motor to rotate the annular core 11 in the circumferential direction.
- the holding arm 31 is provided with a clamp unit 40 on the supply side of the side wire 12.
- the clamp unit 40 is composed of two rollers 40a and 40b, prevents lateral vibration of the annular core 11, maintains stable circumferential rotation, positions the winding points of the side wires 12, and has high winding properties. Have gained.
- the annular core 11 is rotated vertically in a circumferential direction while suppressing lateral vibration.
- the holding arm 31 is swingably installed on the stand 44 so that the pendulum is moved by the swing mechanism 50 including the rotating disk 42 and the crankshaft 43 with the clamp unit 40 as a fulcrum.
- the annular core 11 held by the holding arm 31 is one end of the period of the pendulum movement
- the reel 33 is located outside the ring of the annular core 11
- the other end of the period of the pendulum movement of the annular core 11 is the annular core. Swing so that it is in the 11th wheel.
- a pair of front and rear cassette stands 52 are horizontally installed at a distance that does not hinder the pendulum movement of the annular core 11 held by the holding arm 31.
- a reel delivery mechanism is provided which faces the annular core 11 across the surface.
- the supply unit 41 includes a reel 33 around which the side wire 12 is wound, and a cassette 53 having a cylindrical outer peripheral wall having a diameter slightly larger than the outer diameter of the reel 33 and corresponding to at least the inner width of the reel.
- the reel 33 is rotatably accommodated in the cassette 53 so as to cover the entire winding surface of the side wire 12, and is formed into a so-called cartridge.
- the starting end of the side wire 12 is installed on the holding arm 31 with an unvulcanized rubber sheet made of the same material as the rubber of the vehicle tire 1. Temporarily fasten to the annular core 11. Then, the reel 33 of the supply unit 41 is reciprocated across a core surface which is a plane including the annular core 11 at a predetermined position, and the pendulum motion is performed using the annular core 11 as a fulcrum with the clamp unit 40 serving as a winding point of the side line 12.
- the distance from the reel 33 to the winding point of the side wire 12 is kept substantially constant, and the side wire 12 drawn from the reel 33 does not loosen during winding, and the side wire 12 spirals to the annular core 11 with a constant tension. It is wound into a shape.
- the starting end temporarily fixed to the annular core 11 is removed, and the starting end and the end are connected and fixed by a metal sleeve.
- the bead cord 2 having the sheath layer 13 in which the side wires 12 are spirally wound around the annular core 11 is obtained.
- the start end and the end may be connected and fixed by, for example, a sleeve made of brass or a lightweight material (plastic, fluororesin, etc.).
- the side wire 12 wound around the reel 33 has a diameter die attachment ratio of less than 20%. That is, the diameter shaping ratio of the side line 12 when the side line 12 is wound around the annular core 11 in a spiral shape is less than 20%. Thereby, the winding pitch at the time of winding the side wire 12 around the annular core 11 can be set to a desired value, and the winding tension can be stabilized. Therefore, the operation of forming the sheath layer can be performed smoothly, and manufacturing is easy.
- the bead cord 2 formed in this way is annealed and the side wire 12 is molded.
- the molding process is performed so that the diameter molding rate of the side wires 12 is 20% or more and 105% or less.
- the diameter mold attachment ratio does not exceed 100%, the strength utilization ratio is improved as the diameter mold attachment ratio is increased. Therefore, it is preferable that the diameter mold attachment rate is 100% or less. However, even if the diameter molding rate exceeds 100%, the rubber penetrates into the gap between the annular core 11 and the side wires 12, so that the strength utilization rate can be kept good if it is 105% or less without being greatly reduced.
- ⁇ Annealing for the molding process is performed in a reduced pressure environment.
- the bead cord 2 formed as described above is heated using a vacuum (reduced pressure) heating furnace capable of supplying an inert gas such as helium or argon to the internal heating space and discharging it from the heating space.
- a vacuum (reduced pressure) heating furnace capable of supplying an inert gas such as helium or argon to the internal heating space and discharging it from the heating space.
- an inert gas is supplied into the heating space of the heating furnace, and after the bead cord 2 is put into the heating furnace, the inert gas is forced from the heating space. Discharge to vacuum or vacuum.
- the bead cord 2 is heated, and the side wires 12 are subjected to a low temperature annealing treatment. Thereby, the surface oxidation of the side wire 12 that adversely affects the adhesion to rubber can be prevented, and the side wire 12 can be molded in a shape wound around the annular
- the annealing amount (temperature ⁇ time) of the molding process exceeds the heating amount (temperature ⁇ time) necessary for vulcanization when the tire is molded by being embedded in the rubber of the vehicle tire 1. Thereby, it becomes easy to obtain the effect of promoting the age hardening of the side wire 12 and improving the strength of the side wire 12.
- the heating amount required for vulcanization when molding a tire is 170 ° C. ⁇ 15 minutes even under high temperature conditions, an improvement in strength by age hardening can be expected at an annealing temperature of 180 ° C. or higher.
- the amount of annealing in the molding process is a heating time of 180 to 320 ° C. and a heating time of 5 to 120 minutes. .
- the melting point (419.6 ° C.) of zinc contained in the brass it is preferable to consider the melting point (419.6 ° C.) of zinc contained in the brass, and the annealing temperature of the molding process is suitably 320 ° C. or less.
- the annealing amount of the mold forming treatment is 5 minutes or more at a heating temperature of 180 ° C. or more and 380 ° C. or less.
- the heating time is 120 minutes or less.
- the heating time of the bead cord 2 alone is sufficiently small compared with the time of vulcanization when the tire is molded. Therefore, the annealing time of the molding process is 5 minutes or more regardless of the presence or absence of brass plating. Can be annealed sufficiently uniformly.
- the bead cord 2 of this embodiment can improve the strength utilization factor of the side wire 12 because the diameter-type attachment ratio of the side wire 12 wound around the annular core 11 is 20% or more and 105% or less. .
- the strength can be ensured even if the diameters of the annular core 11 and the side wires 12 are reduced, thereby reducing the weight. be able to.
- the shaping process is performed after the sheath layer 13 is formed, the winding pitch when the side wire 12 is wound around the annular core 11 can be set to a desired value, and the winding tension can be stabilized.
- the winding operation can be performed smoothly and is easy to manufacture.
- a rubber sheet to which a vulcanization accelerator is added is attached to the bead cord 2 to obtain a bead cord with rubber.
- a bead cord with rubber is incorporated into the bead portion 3 of the vehicle tire 1 and is put into a tire molding machine as an unvulcanized rubber composite having a tire shape. Thereafter, the molding die is pressurized and vulcanized to complete the tire.
- the side wire 12 is plated, the sulfur component contained in the rubber sheet reacts with and adheres to the plating of the side wire 12.
- the bead cord 2 and the rubber sheet may be bonded to each other by a metal rubber adhesive suitable for bonding metal and rubber without adding a vulcanization accelerator to the rubber sheet.
- a metal rubber adhesive suitable for bonding metal and rubber without adding a vulcanization accelerator to the rubber sheet. This is effective in the case where the rubber sheet is not applied, and the rubber sheet can be securely fixed to the side wire 12.
- Chemlock registered trademark, manufactured by Road Far East Incorporated
- the vehicle tire 1 manufactured in this way uses the above-described bead cord 2 that is lightened while ensuring strength, it is easy to manufacture, can be reduced in weight, and is an eco-friendly eco-tire. can do.
- Annular core steel wire with a wire diameter of 1.5 mm (medium carbon steel: containing 0.52% by mass of carbon (C))
- Side wire Steel wire with a wire diameter of 1.4 mm (high carbon steel: containing 0.82% by mass of carbon (C)) Twisted structure ... 1 ring core + 1 side wire x 6 ring core pitch circle ( ⁇ mm) ... 436.6 mm Number of windings of side wire: 13 times / round (winding pitch: 105 mm)
- the average value is taken as the wave height of the side line.
- the remaining five side lines are measured in the same manner, and the average value of the wave heights of the six side lines is set as the wave height H of the side lines in the bead cord (see FIG. 5).
- Bead cord strength utilization rate (%)
- Weight reduction rate of bead cord (each example Strength utilization factor ⁇ strength utilization factor ⁇ of comparative example 1) / strength utilization factor ⁇ ⁇ 100 of comparative example 1 ”.
- Comparative Example 3 in which the annealing temperature was higher than 400 ° C., the diameter-type attachment ratio of the side line was more than 100%, and the strength utilization factor of the bead cord was less than 80%. In these comparative examples 2 and 3, the weight reduction rate remains at 2% or less.
- the annealing temperature is set to 180 ° C. or higher so that the annealing amount is equal to or higher than the heating amount (170 ° C. ⁇ 15 minutes) required for vulcanization when the tire is molded, and plating is present.
- the side wire diameter mold rate was 20% or more and 105% or less
- the bead cord strength utilization rate was 80% or more.
- the weight reduction rate of the bead cord was improved to 4% or more.
- Example 5 the improvement of the strength utilization rate and the weight reduction rate calculated from it was seen, so that the annealing amount (temperature x time) of the mold forming process increased.
- the annealing temperature was 360 ° C. with plating, and even though the surface condition of the side line did not lead to elution, a phenomenon that the soft part slightly depressed due to the atmosphere flow in the furnace was observed. As a result, there was no problem in the adhesion.
- a bead cord was produced without brass plating, applied with Chemlock (registered trademark), wound with a raw rubber sheet, and pressure vulcanized in the same manner as described above. Evaluation was made of the diameter type attachment ratio of the side wire, the strength utilization rate and weight reduction rate of the bead cord, and the line surface state of the side wire.
- the structure of the bead cord is the same as that in Examples 1 to 12 and Comparative Examples 1 to 3.
- the pressure vulcanization conditions were heating at 150 ° C. for 30 minutes at a pressure of 4 kg / cm 2 .
- the evaluation items in Table 2 are the same as in Table 1 in terms of the diameter mold rate, the weight reduction rate, and the surface state, but were evaluated after cutting and deleting the pressure vulcanized rubber as much as possible. is there.
- the strength utilization rate (%) of the bead cord was almost the same as in Table 1, but was evaluated in the state of a cord with rubber.
- molding rate of the side line was over 105%, and the strength utilization factor of the bead cord was less than 80%.
- the weight reduction rate remains at 2% or less.
- the annealing temperature is 180 ° C. or more and 420 ° C. or less so that the annealing amount is not less than the heating amount (170 ° C. ⁇ 15 minutes) necessary for vulcanization when the tire is molded.
- the diameter-type ratio of the side line was 20% or more and 105% or less
- the strength utilization ratio of the bead cord was 80% or more.
- the weight reduction rate of the bead cord was improved to 4% or more.
- the improvement of the strength utilization rate and the weight reduction rate was seen, so that the annealing amount (temperature x time) of the mold forming process increased.
- Example 19 in which the annealing temperature of the molding process exceeded 400 ° C., the strength utilization compared to Example 18 in which the diameter molding ratio of the side line was 104% and the diameter molding ratio of the side line was 100%. Although the rate and the weight reduction rate were slightly reduced, both are within a good evaluation range.
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Abstract
Description
(1)事前に付与した型付け形状が実際の巻き付けピッチと完全に一致しなければ、巻きつけ途中で徐々にずれが生じて環状コアと側線との間に隙間ができ、撚り乱れが生じる。
(2)環状でないコード(ワイヤーロープなど)における撚り合わせは、1本のコアに対して複数本の側線を同時に撚るが、環状同芯撚りビードコードの場合は、コアが環状であることの他、1本(1周)の環状コアに対して1本の側線を必要な本数分だけ周回させて巻き付けていくため、事前の型付けがあると巻き付けにくくなる。
(3)上記(1)の内容で例え型付けが実際の巻き付けピッチと完全に一致したとしても、環状コアに向けて側線を繰り出すリールからスムースに供給されず、巻き付け張力の変動が生じて成形性に悪影響を及ぼす。
なお、直径型付率は、環状同芯撚りビードコードの直径(環状コア+シース層の断面直径(線径))をDとし、型付けされた側線の波高さ(自己径含む)をHとすると、「直径型付率(%)=H/D×100」で表される。
図1は、車両用タイヤの断面図、図2(a)は環状ビードコードの全体図、図2(b)は環状ビードコードの部分を示す斜視図、図3は環状ビードコードの断面図、図4は側線の側面図である。
また、ビード部3間にカーカス6が架け渡されるとともに、このカーカス6の外側かつトレッド部5の内方にはベルト層7が周方向に巻装されている。
図3は環状コアを振り子運動させる環状同芯撚りビードコードの製造装置を示す概念図、図4は図3の装置の振り子運動の状態を示す概念図である。
そして、サプライ部41のリール33を、所定位置で環状コア11を含む平面であるコア面を横断往復させ、環状コア11を、側線12の巻き付け点となるクランプユニット40を支点にして、振り子運動させる。
そして、連続して所定回数巻き付けたら、環状コア11に仮止めしていた始端を外し、始端と終端とを金属製スリーブによって連結固定する。
なお、始端と終端とは、例えば、真鍮製または軽量素材製(プラスチック、フッ素樹脂等)のスリーブによって連結固定しても良い。
ビードコードの構造を下記に示す。
環状コア…線径1.5mmの鋼線(中炭素鋼:0.52質量%の炭素(C)を含有)
側線…線径1.4mmの鋼線(高炭素鋼:0.82質量%の炭素(C)を含有)
撚り構造…環状コア×1本+側線×6本
環状コアピッチ円(φmm)…436.6mm
側線の巻き付け回数…13回/周(巻き付けピッチ105mm)
(1)側線の直径型付率(%)
環状同芯撚りビードコードから15cmの長さのサンプルを切り出して作成する。その際、環状のビードコードから何の処理もせずに切断すると側線が解撚してばらけ易いため、予め切断箇所の近傍をバインド線等で結束した後、切断する。切断したサンプルの湾曲(ビードコードの環状の湾曲)を直線状になるように若干矯正した後、真直部にコード径測定用専用マイクロメータにて直径D(図5参照)を測定する。
直径Dを測定したサンプルを用いて、結束したバインド線を取り除き、側線6本を無負荷の状態で環状コアから取り外す。6本の側線について、必要により3ピッチ分の波の高さを測定できる長さに切り出し、万能投影器により、1本の側線において試料数n=3(すなわち3ピッチの各波の高さ)で測定し、その平均値をその側線の波高さとする。残りの5本の側線についても同様に測定し、6本の側線の波高さの平均値をそのビードコードにおける側線の波高さH(図5参照)とする。
このようにして求められた直径Dと波高さHを用いて、「直径型付率(%)=H/D×100」の式により直径型付率を算出する。
環状コアの素線及び側線の素線について、予め引張り試験機を用いて、試料数n=3で引張り試験を行い、素線での平均切断荷重を算出する。算出式は、「素線での切断荷重W0(kN)=環状コアの素線の平均切断荷重+側線の平均切断荷重×6」である。
環状のビードコードについて、予め図6に示す専用の治具60を用いて引張り試験機で試料数n=2で引張り試験を行い、ビードコードでの平均切断荷重W1(kN)を算出する。
ここで、図6に示す環状ビードコード用の治具60を使用した引張り試験方法について説明する。環状ビードコード用の治具60は、ビードコード2を一対の溝付き半円盤形状の保持部材61に保持させ、各保持部材61に対してそれぞれボルト64を介して接続した牽引部材62を、それぞれチャック63により把持して離反する方向(図6の上下方向)に引っ張るものである。例えば、下側のチャック63の位置を固定し、上側のチャック63を上方へ引っ張る。チャック63の引張り荷重を測定することで、ビードコード2の切断荷重を測定することができる。
上記のように求めた切断荷重W0,W1から、式「強度利用率η(%)=W1/W0×100」により強度利用率η(%)を算出する。
焼鈍処理しない比較例1の強度利用率ηを基準にして、各例の強度利用率ηの上昇分だけ線径の細径化が図れるため、式「軽量化率(%)=(各例の強度利用率η-比較例1の強度利用率η)/比較例1の強度利用率η×100」により算出する。
焼鈍温度の違いによる側線の表面状態の変化を観察する。特に、真鍮めっき有りの場合(比較例1,2、実施例1~6)に、ゴムとの接着性に支障を生じさせないために表面の凹凸がどの程度生じるかを観察する。
ビードコードの構造は、上記実施例1~12、比較例1~3と同様である。
なお、加圧加硫の条件は、4kg/cm2の圧力で150℃×30分の加熱とした。
ビードコードの強度利用率(%)は、表1とほぼ同様であるが、ゴム付きコードの状態で評価した。
Claims (7)
- 環状コアの周りに側線を螺旋状に巻き付けて1層または複数層のシース層とした環状同芯撚りビードコードであって、
前記側線の直径型付率が20%以上105%以下であることを特徴とする環状同芯撚りビードコード。 - 環状コアの周りに側線を螺旋状に巻き付けて1層または複数層のシース層を形成する環状同芯撚りビードコードの製造方法であって、
前記シース層を形成した後、前記環状同芯撚りビードコードを焼鈍して前記側線の直径型付率が20%以上105%以下となるように型付け処理することを特徴とする環状同芯撚りビードコードの製造方法。 - 請求項2に記載の環状同芯撚りビードコードの製造方法であって、
前記側線を前記環状コアの周りに螺旋状に巻き付けるときの前記側線の直径型付率が20%未満であることを特徴とする環状同芯撚りビードコードの製造方法。 - 請求項2または3に記載の環状同芯撚りビードコードの製造方法であって、
前記型付け処理は、車両用タイヤのゴムに埋め込まれてタイヤ成型される時の加硫に必要な加熱量(温度×時間)を超える焼鈍を行なうことを特徴とする環状同芯撚りビードコードの製造方法。 - 請求項3または4に記載の環状同芯撚りビードコードの製造方法であって、
前記環状コア及び前記側線の少なくとも一方に真鍮めっき処理が施されており、
前記型付け処理は、減圧された不活性ガス雰囲気であって180℃以上320℃以下の環境下で5分以上120分以下の焼鈍を行なうことを特徴とする環状同芯撚りビードコードの製造方法。 - 請求項3または4に記載の環状同芯撚りビードコードの製造方法であって、
前記環状コア及び前記側線に銅合金または亜鉛のめっき処理が施されておらず、
前記型付け処理は、減圧された不活性ガス雰囲気であって180℃以上380℃以下の環境下で5分以上120分以下の焼鈍を行なうことを特徴とする環状同芯撚りビードコードの製造方法。 - 請求項1に記載の環状同芯撚りビードコード、または請求項2から6の何れか一項に記載の環状同芯撚りビードコードの製造方法により製造した環状同芯撚りビードコードが埋め込まれていることを特徴とする車両用タイヤ。
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EP09720181A EP2179870A1 (en) | 2008-03-14 | 2009-03-12 | Annular, concentrically twisted bead cord, process for producing the same, and vehicle tire |
US12/670,795 US20100200143A1 (en) | 2008-03-14 | 2009-03-12 | Annular concentric stranded bead cord, method for manufacturing the same, and vehicle tire |
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EP2436807A1 (en) * | 2010-09-30 | 2012-04-04 | NV Bekaert SA | Multi-filament with drawn steel core and annealed copper layer |
FR2982884B1 (fr) * | 2011-11-23 | 2014-06-06 | Michelin Soc Tech | Cable metallique a deux couches, gomme in situ par un elastomere thermoplastique insature |
US8622106B1 (en) | 2012-08-27 | 2014-01-07 | The Goodyear Tire & Rubber Company | Bead structure for a pneumatic tire |
DE102012108173A1 (de) * | 2012-09-04 | 2014-03-06 | Continental Reifen Deutschland Gmbh | Fahrzeugluftreifen, vorzugsweise Nutzfahrzeugluftreifen |
FR3013737B1 (fr) * | 2013-11-22 | 2016-01-01 | Michelin & Cie | Fil d'acier a haute trefilabilite comprenant un taux de carbone en masse compris entre 0,05 % inclus et 0,4 % exclu |
TR201900178T4 (tr) * | 2014-05-08 | 2019-02-21 | Bekaert Sa Nv | Azaltılmış Artık Torsiyonlara Sahip Çelik Halat |
JP2016014207A (ja) * | 2014-07-03 | 2016-01-28 | 住友電気工業株式会社 | ケーブルビードおよびその製造方法 |
WO2016017508A1 (ja) * | 2014-07-30 | 2016-02-04 | 株式会社ブリヂストン | タイヤ |
KR101692503B1 (ko) * | 2014-11-04 | 2017-01-03 | 홍덕산업 주식회사 | 단일 용접에 의한 케이블비드 및 그 제조방법 |
CN107406689A (zh) * | 2014-12-31 | 2017-11-28 | 株式会社普利司通 | 用于将钢合金粘附到橡胶的氨基烷氧基改性倍半硅氧烷粘合剂 |
JP5870226B1 (ja) * | 2015-06-26 | 2016-02-24 | トクセン工業株式会社 | 操作用ロープ |
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US11529697B2 (en) * | 2017-09-29 | 2022-12-20 | Lincoln Global, Inc. | Additive manufacturing using aluminum-containing wire |
US11426824B2 (en) | 2017-09-29 | 2022-08-30 | Lincoln Global, Inc. | Aluminum-containing welding electrode |
CN111908322A (zh) * | 2020-08-21 | 2020-11-10 | 广西桂冠电力股份有限公司大化水力发电总厂 | 灯泡贯流式水轮发电机主轴吊装带及吊装方法 |
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- 2009-03-12 CN CN200980100048A patent/CN101784403A/zh active Pending
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US20100200143A1 (en) | 2010-08-12 |
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