WO1996029464A1 - Corps filamentaire en acier a resistance elevee, destine a renforcer un produit en caoutchouc - Google Patents

Corps filamentaire en acier a resistance elevee, destine a renforcer un produit en caoutchouc Download PDF

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Publication number
WO1996029464A1
WO1996029464A1 PCT/JP1996/000634 JP9600634W WO9629464A1 WO 1996029464 A1 WO1996029464 A1 WO 1996029464A1 JP 9600634 W JP9600634 W JP 9600634W WO 9629464 A1 WO9629464 A1 WO 9629464A1
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WO
WIPO (PCT)
Prior art keywords
steel
steel wire
cord
strength
wire
Prior art date
Application number
PCT/JP1996/000634
Other languages
English (en)
Japanese (ja)
Inventor
Masaki Katayama
Kazuo Matsumaru
Yoshiyuki Oguro
Original Assignee
Tokyo Rope Manufacturing 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
Priority claimed from JP7084568A external-priority patent/JP2906025B2/ja
Priority claimed from JP8070870A external-priority patent/JP2906035B2/ja
Application filed by Tokyo Rope Manufacturing Co., Ltd. filed Critical Tokyo Rope Manufacturing Co., Ltd.
Publication of WO1996029464A1 publication Critical patent/WO1996029464A1/fr
Priority to US08/751,872 priority Critical patent/US5956935A/en

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Classifications

    • 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
    • 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
    • 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
    • B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
    • B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
    • B60C9/2003—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel characterised by the materials of the belt cords
    • B60C9/2006—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel characterised by the materials of the belt cords consisting of steel cord plies only
    • 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
    • D07B2201/2022—Strands coreless

Definitions

  • the present invention is c background technology suitable high strength strong catching rubber products, to high performance and low cost steel striatal represented by tires or conveyer belts of the automobile
  • This “steel striated body” is a steel wire or steel filament (hereinafter referred to as “steel filament”) with a diameter of 0.1 to 0.4 O mm, whose surface is polished to improve adhesion to rubber. Wire) and steel cords of various structures in which multiple steel wires are twisted and twisted.
  • a steel filament when both a steel wire and a steel cord are included, it is referred to as a steel filament.
  • steel wire is generally manufactured from a carbon steel wire rod containing 0.70 to 0.75 wt% of carbon, and as shown in Fig. 1, it has a tensile strength in relation to the wire diameter (mm).
  • the resilience Y (N / mm 2 ) was Y ⁇ —1960 d + 3290.
  • Li tensile strength in diameter Suchiruwa I turbocharger is 0. 2 5 mm is 3 0 9 0 NZmm 2 or more, 2 8 9 0 N mm 2 or more high strength is appropriate in diameter is 0. 3 5 mm .
  • such a high-strength steel wire has been generally made by using a high-carbon steel wire containing 0.80 wt% or more of carbon as a raw material steel wire and drawing it.
  • a high-carbon steel wire containing 0.80 wt% or more of carbon As a raw material steel wire and drawing it.
  • a steel wire with the above strength must be drawn at a total area reduction of approximately 96.0 to 97.0%. It was made.
  • the reason for using a high-carbon steel material in this way is that if a carbon steel wire material with a carbon content of 0.70 to 0.75 wt% is used, the strength of the raw material steel wire itself is low, so the final heat treatment must be performed.
  • the strength of the wire after application is naturally lower than that of the steel with high carbon content. Therefore, in order to obtain a steel wire with the same strength as a steel wire manufactured from a high carbon steel wire rod, it is necessary to take a particularly high area reduction (working degree) in the drawing process.
  • the carbon content is 0.80 wt. /.
  • using a high-carbon steel wire rod with a carbon content of 0.8 wt% or more requires a reduction in raw material costs. The rise is inevitable.
  • the higher the carbon content the more likely to be biased in the steelmaking process.
  • the heat treatment becomes difficult. There is a problem that the adverse effect of non-metallic inclusions appears significantly in the twisting and re-wire process.
  • the “toughness” of the steel wire mentioned above is very important. The reason for this is that if the deterioration of toughness exceeds a certain limit, the above-mentioned processing defects may occur, and the fatigue resistance may also rapidly decrease.
  • the problem of steel wire toughness is related to the demand for cost reduction. In other words, as a cost reduction measure, the number of steel wires that make up the steel cord was reduced, and a simple IX3 structure, for example, was used. It is effective to adopt a simple structure. However, if the number of steel wires is reduced, it is necessary to increase the strength of the steel wire and increase the diameter of the steel wire in order to maintain the required strength of the steel cord. However, as the steel wire diameter increases, the wire diameter effect greatly reduces fatigue resistance to bending. To solve this problem, it is essential that the steel wire has good toughness.
  • the first object of the present invention is to use a low-cost carbon steel wire rod, yet have high strength, rich in toughness and fatigue resistance, and to appropriately reduce the S and improve the fatigue resistance of rubber products.
  • the purpose is to provide a steel filament for reinforcing rubber products that can be achieved.
  • the second object of the present invention in addition to the first object, is that it can efficiently realize strength equal to or higher than that of a conventional high-strength steel cord while having a simple structure, and at the center. Rubber enough to penetrate (good corrosion resistance)
  • Another object of the present invention is to provide a new steel cord for rubber reinforcement capable of exhibiting excellent fatigue resistance even when the diameter of the steel wire is increased.
  • a third object of the present invention is to provide a radial tire that has a long life and can be reduced in weight.
  • the steel cord of the present invention is also suitable as a reinforcing material for various rubber products such as a conveyor belt and a high-pressure hose. Disclosure of the invention
  • the present invention uses a carbon steel wire rod containing 0.70 to 0.75 wt% of carbon, heat-treats and plating it, and then performs wire drawing.
  • the steel wire has a diameter of 0.10 to 0.4 Omm.
  • the steel wire has a tensile strength satisfying the following equation. Y ⁇ -l960 d + 358 0 [Y: tensile strength (NZmm 2 ), d: diameter (mm)]
  • the torque reduction rate is 7% or less in the twist-torque curve in the twist-torque test in which reverse twisting is performed after twisting in one direction.
  • the steel cord has an l x n structure, an n + m structure represented by 2 + 2, and an lxn structure as a core. All those having a structure in which the wire is arranged and twisted together are included.
  • the present invention uses a carbon steel wire rod containing 0.70 to 0.75 wt% of carbon, heat-treats and plating it, and then performs wire drawing. It is a steel cord that uses three high-strength steel wires for reinforcing rubber products, and has the following features.
  • Each steel wire has a diameter of 0.20 to 0.35 mm.
  • Each steel wire has a tensile strength that satisfies the following equation. Y ⁇ -l960 d + 358 0 [Y: tensile strength (NZmm 2 ), d: diameter (mm)]
  • Each steel wire has a characteristic that the torque reduction rate is 7% or less in the twist-torque curve in the twist-torque test in which twisting in the reverse direction is performed after twisting in one direction.
  • the cord twist re-pitch is in the range of 400 to 65 (1) with respect to the steel wire diameter d (mm).
  • the high-strength steel wire is preferably made by wet drawing under the following conditions.
  • the present invention provides an automotive radial tire using any one of the steel cords for reinforcing a belt portion.
  • Figure 1 is a diagram showing the relationship between the diameter and the tensile strength of steel wires made using steel wires with different carbon contents.
  • FIG. 2 is a side view showing the outline of the torsional torque test method for toughness evaluation according to the present invention.
  • Fig. 3-A is a one-way twist torque curve diagram.
  • FIG. 3-B is a one-way, one-way reverse twist torque curve diagram applied in the present invention.
  • FIG. 4 is a flowchart showing a manufacturing process of a high-strength steel wire according to the present invention.
  • FIG. 5-A is a plan view schematically showing a wet drawing step in the present invention.
  • FIG. 5B is a sectional view schematically showing a wet drawing step in the present invention.
  • FIG. 6 is a sectional view of a drawing die used in the present invention.
  • FIG. 7 is a sectional view of the finish drawing die used in the present invention.
  • FIG. 8 is an enlarged side view showing a part of one steel cord suitable for the present invention.
  • FIG. 9 is a schematic enlarged cross-sectional view of one twist re-pitch of FIG.
  • FIG. 10-A through FIG. 10-F are schematic sectional views showing enlarged examples of other steel cords to which the steel wire of the present invention is applied.
  • Figure 1 1 is a detailed of the c invention is a cross-sectional view of a radial tire for an automobile to which the present invention is applied described
  • FIGS. 8 and 9 show examples of suitable steel cords according to the present invention.
  • the steel cord in this example uses three steel wires having the same wire diameter.
  • the steel wire diameter d is generally suitably selected from the range of 0.10 to 0.40 mm, preferably 0.25 to 0.35 mm.
  • the two steel wires W a and W a are bundled almost in parallel, and one steel wire W b is spirally wound around the bundle so as to be wound in a spiral shape. It has a 2 + 1 structure.
  • the two steel wires Wa and Wa are always close to each other, but the present invention is not limited to this, and portions that are separated from each other may exist in the longitudinal direction.
  • Fig. 9 schematically shows the cross-sectional shape at each position where one pitch of the steel cord is divided into five.
  • the two steel wires W a and W a are bundled and are almost parallel, there is little reduction in strength due to twisting for twisting to the steel cord.
  • the twist pitch P can be made long enough to keep the cord structurally intact and the steel wire has a good strength utilization rate, the steel cord should have a higher strength. Can be.
  • the three steel wires W a, W a, and W b set the ratio (BZA) of the collective strength A before cord twisting and the cord strength B after cord twisting to zero (BZA). 9 3 5 or more.
  • the twisting efficiency is such that the twisting reduction is reduced. If the value is less than 0.935, the tensile strength of the steel wire satisfies the conditions described below. However, twisted cords are not preferred because of insufficient strength.
  • the twist pitch P of the cord that is, the winding pitch of the steel wire Wb, is preferably in the range of 40 to 65 times the steel wire diameter d.
  • the wire twist pitch P is less than 40 d with respect to the steel wire diameter d, the pitch is too short and the twist twist efficiency (B / AX 100%) is low, and the rubber permeability is low. Not desirable because of the tendency. On the other hand, if the twist pitch P is longer than 65 d, it is inappropriate because the cord is apt to disperse.
  • FIG. 10-A to Fig. 10-F show other steel cores to which the present invention is applied.
  • An example of the password is shown.
  • Figure 10-A consists of an IX2 structure in which two steel wires Wa and Wb are twisted together.
  • Figure 1 0- B is three steel wires Wa, W b, W c simultaneously is of 1 chi 3 structure twisted c
  • Figure .1 0- C is four steel wires Wa, W b
  • Fig. 10—D shows a 1 x 5 structure in which five steel wires Wa, Wb, Wc, Wd, and We are simultaneously twisted and twisted. ing.
  • FIG. 10—E shows 1 X 5 loose in which five steel wires Wa, Wb, Wc, and Wd were overmolded before twisting and then the steel wires were simultaneously twisted and loosened. It has an open structure.
  • Figure 10-F uses four steel wires W a, W a, W b, and W b as a pair, and bundles a pair of steel wires W a, Wa almost in parallel, and It has a 2 + 2 structure in which the other pair of steel wires Wb, Wb are wrapped so as to be wound.
  • the present invention is a steel cord having a 1 ⁇ n structure or an n + m structure including 2 + 3 and 3 + 3 (not shown) as described above, and is further represented by an IX 3 + 6 structure.
  • This includes a multi-layer structure in which a plurality of steel wires are arranged around the outer periphery of the 1Xn structure and twisted and twisted. Since these steel cords also use steel wires that clear the torque reduction rate in a special toughness limit determination method as described below, they can exhibit high strength and excellent fatigue resistance.
  • the steel wires Wa, Wb, Wc, Wd, and We (hereinafter referred to as W) constituting the above steel cord are made of carbon steel wire containing 0.70 to 0.75 wt% carbon. After drawing to the specified intermediate diameter, heat treatment and Those made by plating and wire drawing, and has a high strength of twisted before tensile Li strength Y is Y ⁇ - 1 960 d + 3 5 8 0 (N / mm 2). When the tensile strength Y before twisting is less than Y-1 960 d + 3580 (N / mm 2 ), there is little difference from the conventional one, and the tire is lighter due to higher strength! : No effect can be achieved.
  • the lower limit of the carbon content of the carbon steel wire rod was set to 0.70 wt%. If the carbon content was lower than this, the tensile strength Y ⁇ —196 0 d + 3 5 8 0 ( N / mm 2) because can not be obtained.
  • the upper limit is set to 0.75 wt% because there is a problem such as higher cost if the carbon content exceeds this.
  • the upper limit of the strength level is usually 1,960 d + 3,920 (N / band 2 ) because of the carbon content.
  • component compositions are as follows: C: 0.70 to 0.75% by weight, Si: 0.12 to 0.35%, Mn: 0.3 to 0.9%, balance Fe and inevitable impurities
  • Cr or Ni may be added to the basic component composition in a predetermined amount as an alloying element.
  • the steel wire W of the present invention has good toughness before and after twisting. Specifically, in a torsion test in which a reverse twist is applied after a one-way twist, a decrease in the torque value before the fracture occurs when a continuous curve of one twist and one torque is taken is 7%. It means that:
  • the method of determining the quality of the toughness in the present invention is as follows: the steel wire W is gripped by the fixed-side gripper 6 and the movable-side gripper 7 facing a predetermined distance L, and A light weight is applied in the axial direction of the steel wire as shown by the arrow by suspending the weight on the steel wire. Then, in this state, the movable gripper 7 is rotated by the motor 9 at a constant speed in a fixed direction (for example, clockwise direction) a predetermined number of times, and then the movable gripper 7 is once rotated. Then, the steel wire is twisted in the opposite direction (for example, counterclockwise direction) to obtain a twist-one torque curve until the steel wire breaks.
  • a fixed direction for example, clockwise direction
  • the present inventor twisted one direction and one reverse direction for many steel wires of different diameters and materials as shown in Fig. 3-B, and took a twist-torque curve. saw.
  • a steel wire with a torque reduction rate of 7% or less has sufficiently high strength, good toughness, and a decrease in strength even when twisted and corded. It was found that the fatigue resistance was small and good.
  • the torque reduction rate ⁇ ⁇ is the elastic limit of the torsion in the first one-way torsion in the torsion-torque curve of FIG. 3-B, that is, the upper right in the figure is the torque value at the upper limit of the straight line portion.
  • T the minimum torque value of the reduced part due to twisting in the opposite direction
  • the above-mentioned problem occurs in the steel wire in which the torque reduction rate is 8% or more, and the other steel wires have sufficient toughness and are optimal as a reinforcing material even in the case of a steel cord.
  • the steel wire has both high strength and toughness, and even if twisted to the cord, the strength decreases little (high twisting efficiency), the strength is sufficiently exhibited, and the resistance is high. It is also possible to obtain much better fatigue properties than conventional steel-to-steel cords.
  • Fig. 4 shows the process.
  • the carbon wire containing 0.70 to 0.75 wt% of carbon has a diameter of about 4.0 to 5.5 mm. Is used.
  • the raw wire is pickled, coated, and continuously dry-drawn (using powdered lubricant) to fade to a diameter of, for example, 1.2 to 2.3 mm.
  • the process then proceeds to a heat treatment and plating process (in the case of the vertical plating method), or a heat treatment in a single-step diffusion process (in the case of a two-layer coating of the body and zinc).
  • the heat treatment is performed, for example, by using a gas-fired heating furnace or the like.
  • the intermediate-diameter steel wire is heated to about 900 to 960 mm for a predetermined time to be austenitized.
  • the intermediate-diameter steel wire is fed into a patenting furnace cooled with heated fluidized sand or molten lead, where it is quenched to about 500 to 560X and transformed into pearlite.
  • the strength of the line is preferably set to about 110 to 1200 N / mm 2 .
  • the intermediate-diameter steel wire is subjected to electrolytic pickling in a plating pretreatment bath to remove an oxide film on the surface of the steel wire. Then, it is passed through an electroplating tank, and a two-layer plating is performed in which the copper plating and the zinc plating are applied sequentially in a predetermined amount of force or a predetermined amount.
  • the plated steel wire is expanded using heated fluidized sand. It is passed through a furnace or heated by directly energizing a steel wire to diffuse copper and zinc, which are plating components, to each other to make them straight. After that, it is cooled to become the final raw steel wire.
  • heating is performed at about 600 ° for a predetermined time, but if the number of brasses is large, the subsequent wire drawing workability will deteriorate, and ⁇ brass will be increased as much as possible without reducing the strength of the steel wire. It is preferable to set such conditions as heating time and temperature.
  • the final raw steel wire produced in this way is attached to a continuous wet drawing machine using a liquid lubricant to a target diameter in the range of 0.1 to 0.4 O mm. .
  • the present invention employs the following conditions.
  • FIGS. 5A and 5B schematically show the wet drawing process.
  • Numeral 10 denotes a lubricating liquid tank, which contains a lubricating liquid 11 in which a normal steel cord lubricant is dissolved in water at a concentration of 10 to 30%.
  • lubrication A payoff reel 13 is provided upstream of the liquid tank 10, and a steel wire winding reel 14 as a final product is provided downstream of the lubricating liquid tank 10. Equipped via.
  • a pair of capstans 12, 12 ′ are rotatably suspended in a parallel manner so as to be immersed in the lubricating liquid 11, respectively. It is driven by a variable speed motor (not shown).
  • a plurality of drawing dies D are arranged between the pair of capstans 12 and 12 ', and the steel wires hung in the grooves of the capstans 12 and 12' pass sequentially through the drawing dies. It is designed to be pulled out.
  • a circulating pump 15 and a cooler 16 are provided outside the lubricating liquid tank 10 to form a circulating system in which the lubricating liquid is forcibly extracted from the tank, cooled, and returned to the tank.
  • the temperature of the lubricating fluid 11 is controlled to 40 or less, preferably 30 to 35 during operation.
  • the wire speed in wet drawing is 500 m / min or more, but the temperature of the re-steel wire can be reduced to 150 ° or less by the lubricating fluid temperature control and the effect of reskin pass drawing on the top. .
  • Fig. 6 shows a drawing die (including a double die for finish drawing described later) used in the wet drawing process.
  • 1 is a dice containing nibs 2.
  • the angle 2 ⁇ of the approach portion 20 is 8 to 10 °, and the length ⁇ of the bearing portion 21 is 0.3.
  • the reason for increasing the degree of work hardening is that it contains carbon!
  • the total working ratio must be very high, which would exceed the working limit. Therefore, the wire drawing limit is raised by using a low abutment angle die of 8 to 10 °, and the work hardening degree for each pass is increased to keep the overall workability relatively low.
  • the angle is reduced by 8 °, the pull-out resistance of the steel wire is too high, which is not appropriate.
  • the bearing length ⁇ of the die is conventionally the drawing hole diameter d! Is generally 0.5 d, whereas the present invention sets it to 0.3 d !.
  • the reason for this is that if the bearing length is about 0.5 di as in the past, heat generation becomes significant due to the increase in pullout resistance. Therefore, the present invention reduces the length of the bearing, thereby reducing the contact length with the steel wire and reducing the pull-out resistance.
  • Fig. 7 shows a double die D 'for finish drawing, and a normal die 5a and a skin pass die 5b are arranged in series in close proximity to the casings 4 and 4, respectively. Is divided into two.
  • the nibs 2a and 2b of the normal die 5a and the skin pass die 5b Each is made of sintered diamond, and has the above-mentioned broaching angle and bearing length.
  • At least two sintered nibs 2a and 2b of a double die D 'and a drawing die upstream of the nibs 2a and 2b are used. The reason is as follows. '
  • a die using a conventional sintered carbide gold nip made of tungsten carbide has a rough drawing hole surface, so the drawing resistance is high and the surface of the steel wire is also roughened by transfer. This has an adverse effect on fatigue resistance.
  • the sintered diamond nib has a very smooth surface roughness compared to the sintered nib, so that the drawing force can be reduced. In addition, the surface of the drawn steel wire becomes smooth, which is effective in improving fatigue resistance.
  • the sintered diamond is particularly hard, there is almost no abrasion due to continuous drawing, and it is possible to prevent an increase in the die diameter due to abrasion and a change in the area reduction rate due to the abrasion.
  • a sintered alloy nib may be used for another drawing die.
  • a skin pass with a surface reduction rate of 1.2 to 3.9% is performed using a double die as a finish drawing die. The reason for this is that the wire heat generated by drawing can be reduced, and the wire temperature immediately after drawing can be reduced by about 25 to 40 ° C as compared with the case of a single die. This is because the residual stress on the wire surface can be suppressed to the negative side.
  • the reason why the drawing reduction rate by the skin pass dies 5b was set in the range of 1.2 to 3.9% is that when it is 1.1% or less, the amount of processing is too small to reduce the residual stress, and 4. This is because the effect of relaxing the residual stress is small even if it is too large as 0% or more.
  • the lubricating fluid temperature is kept low so that the temperature of the steel wire immediately after passing through the final die becomes 150 ° C or less. This, together with the use of a skin pass, can prevent the steel wire from becoming brittle due to aging.
  • a method of keeping the lubricating fluid temperature low is to install a circulation pump 15 and a cooler 16 outside the tank of the wet wire drawing machine 10 to forcibly remove the circulating fluid from the tank.
  • the circulation system may be cooled and returned to the tank, and the lubricating fluid temperature may be controlled to, for example, 35 or less during operation.
  • continuous wet-drawing is performed by setting the number of times of drawing so that the total area reduction rate is about 96.5 to 98.2% by the above-described die group.
  • the reason is that if the total area reduction is less than 96.5%, the tensile strength of the steel wire is insufficient, and if it is more than 98.2%, the workability is too large and the toughness of the steel wire is too low. This is because it deteriorates.
  • the number of times of drawing is generally selected from 20 to 25 times. It is preferable that the area reduction rate by the drawing die every time becomes lower in the later stage, and that the double die is used as a finish to release the residual tensile stress of the surface portion of the steel wire. However, by setting the skin bath area reduction rate by the skin pass dies 5b at the finish area reduction rate as described above, it is possible to obtain an appropriate action of reducing the residual stress.
  • the production cost While using a carbon steel wire rod with a carbon content of 0.70 to 0.75 wt%, which does not cause a large size of the rod, a wire having high strength and excellent toughness can be obtained.
  • the degree of work hardening in one pass can be increased and the total degree of work can be increased, so that a steel wire having the above characteristics can be stably manufactured without variation.
  • it was t may for connexion to use this steel wire Li, also code for less Suchiruwaiya number of I Una three illustrated in Figures 8 and 9, less strength reduction due to twist Li alignment is, fatigue resistance Is also very good.
  • FIG. 10 shows a tire in which a steel cord according to the present invention is applied to a reinforcing layer, and sheet-like belt reinforcing layers B1 and B2 are embedded in a belt portion below the tread.
  • the belt reinforcement layers Bl and B2 are integrated with the rubber matrix by arranging steel cords in a rubber sheet of the required thickness. At least one of the belt reinforcing layers Bl and B2 uses the steel cord of the present invention.
  • the raw material wire is pickled, pre-treated for coating, and then dry-drawn.
  • An intermediate diameter steel wire with a diameter of 1.65 mm was used.
  • This intermediate-diameter steel wire was first heated to about 95 O in a direct-fired gas heating furnace, then quenched in a fluidized-bed patenting furnace of about 520520, and immediately cooled with water after the perlite transformation was completed.
  • Tensile Li strength of the steel wire at this time was 1 1 6 O NZmm 2.
  • the medium diameter steel wire was heated to about 500X in a fluidized bed diffusion furnace to perform plating diffusion treatment, and then gradually cooled to obtain an intermediate raw material wire.
  • the lubricating fluid used at this time was a normal wet lubricating fluid with a concentration of about 10%, which was circulated to keep the fluid temperature low through a cooler, and that the temperature of the shell immediately after passing through the upward die was kept at 150 or less did.
  • samples 1 to 6 are manufactured under the conditions of the wet drawing described above, samples 1 to 3 are within the scope of the present invention, samples 4 to 6 are comparative examples, samples 7 is a high-strength C: 0.82 wt% wire manufactured by the conventional method.
  • Table 1 shows the drawing conditions and the properties of the steel wire obtained by the drawing.
  • the “torsion test” means that the gripping distance L between the fixed-side gripper 6 and the movable-side gripper 7 shown in Fig. 2 is 300 d. (d is the diameter of the steel wire), and while slightly applying tension in the axial direction of the steel wire extending from the gripper 6 on the fixed side, grasping the movable side
  • the screw was turned back in the reverse direction at the above-mentioned screwing speed until breaking, and each was determined by taking a twist-torque curve.
  • ⁇ ⁇ ⁇ indicates a torque reduction rate ⁇ 0 of 0 to 7% (good)
  • X indicates a torque reduction rate ⁇ ⁇ . Indicates 8% or more (defective).
  • Sample 8 is a steel cord that uses the sample 1 steel wire.
  • Sample 9 is a steel cord using the steel wire of Sample 2.
  • Sample 10 is steel cord using sample 3 steel wire
  • sample 11 is sample steel 5 using steel wire
  • sample 12 is sample 6 using steel wire
  • sample 13 is sample steel wire.
  • Sample 76 uses the steel wire.
  • Table 2 shows the results of examining the re-wiring property (whether there is any trouble such as disconnection), strength, and fatigue resistance during cord production.
  • “Fatigue resistance” means that one straight steel cord is put into unvulcanized rubber and vulcanized to form a dynamite test specimen, which is arranged in a zigzag pattern and is rotatable. After applying a load of 1% of the breaking load to the roll, the roll is moved back and forth to give a sharp bend to the cord and the cord breaks. This is the result of measuring the number of repetitions up to.
  • the numerical values in the table are 100 for sample 13 (conventional product).
  • samples 8 to 10 of the present invention have strengths equal to or higher than those of the conventional steel cord of Samburu 13 (C: using 0.82 wt% steel wire). It has toughness and is not inferior to conventional products in fatigue resistance.
  • the samples 11 and 12 which are the comparative examples show a large decrease in strength due to the twisted wire and poor fatigue resistance.
  • Samples 14 to 16 used the same lubricating fluid as in sample 1 under wet drawing conditions, a die approach angle of 10 °, and four diamond dies from the top.
  • the skin pass coverage was 2.5% for sample 14, 3.5% for sample 15 and 3.0% for sample 16.
  • Sample 19 is a comparative product manufactured under the same conditions as samples 14 to 16 except that the skin pass reduction rate is 4.5%.
  • Sample 20 is a comparative product manufactured under the same conditions as samples 14 to 16 except that skin pass was not performed.
  • a high-strength steel wire manufactured by a conventional method using a steel wire containing 0.82 wt% of carbon is shown as Sample 21.
  • Table 3 shows the wet drawing conditions and steel wire characteristics of the above samples 14 to 21.
  • samples 14 to 18 have good tensile strength and toughness.
  • the comparative samples, Sample 19 and Sample 20 have good strength, but have substantially poor toughness, low warpage and poor fatigue limit.
  • samples 22 and 23 have the same strength and toughness as steel cord made of C: 0.82 wt% carbon steel wire of sample 26, and have high fatigue resistance. Is not inferior to Sample 26, and has good tensile strength and toughness.
  • the steel wire of the present invention having a diameter of 0.20 mm was manufactured by a wet wire drawing machine. This is designated as Sample 27.
  • the lubricant used was a normal wet lubricant with a concentration of about 10%. Otherwise, the wire was drawn under the same conditions as in Semble 3.
  • Sample 28 a high-strength steel wire was manufactured by the conventional method using C: 0.82 wt% carbon steel wire. This is designated as Sample 28. Table 5 shows the properties and drawing conditions of these samples 27 and 28.
  • a steel wire of the present invention having a diameter of 0.35 mm was manufactured under the wet drawing conditions of Sample 3 using the same intermediate diameter steel wire as Sample 18. This is designated as Sample 29.
  • Sample 29 a steel wire with a diameter of 0.35 mm was manufactured by changing the conditions of the bearing length and the skin pass reduction. This is sample 30.
  • sample 31 A steel wire was produced by drawing under the same conditions as in Sample 29 except that no skin pass was performed. This is designated as sample 31.
  • Samburu 32, C 0.
  • Table 6 shows the drawing conditions and steel wire characteristics of these samples 29-32.
  • Sample 27 steel wire was used for core strand (1 x 3).
  • Sample 29 steel wire was used for side strand (+6) and bunched with a complete set of bunches.
  • a 1 ⁇ 3 + 6 steel record for a tire of the present invention was produced. This is designated as Sample 33.
  • Sample 27 steel wire is used for core strand (1X3), and comparative samples 30 and 31 steel wire are used for side strand (+6), respectively, and buncher set is twisted.
  • a steel cord for tires with a 1 X 3 + 6 structure was manufactured by twisting with a re-wire machine. These are called Samples 34 and 35, respectively.
  • Sample 36 is a high-strength steel cord manufactured by the conventional method using carbon steel wire of C: 0.82 wt%. Table 7 shows the characteristics of these steel cords.
  • the sample 33 of the present invention has a C: 0.82 wt% of the sample 36 despite the fact that a carbon steel wire of 0.72 wt% class is used. It can be seen that the carbon steel wire has strength and toughness equal to or higher than the conventional product, and the steel code has excellent fatigue resistance.
  • the steel wires of the samples 1 to 3, samples 14 to 18 and samples 27 and 29 of the present invention have a carbon content of 0.70 to 0.75 wt%.
  • high-strength steel wire it has the same or higher strength than high-strength steel wire with a carbon content of 0.82 wt%, and has good toughness and excellent fatigue resistance It is clear that this is a typical rubber reinforcing steel wire.
  • the steel cords of the present invention of Samples 8 to 10, 22 to 23, and 33 use the steel wire having the above characteristics, and thus have a high reinforcing effect on rubber products and are inexpensive. There is a bird.
  • the chemical composition is wt%, C: 0.75, Si: 0.21, Mn: 0.52, 5.5 mm in diameter consisting of the balance Fe and unavoidable impurities.
  • a wire was used.
  • the raw material wire was subjected to pretreatments such as pickling and coating, followed by continuous dry drawing to obtain an intermediate-diameter steel wire having a diameter of 1.68 mm.
  • pretreatments such as pickling and coating, followed by continuous dry drawing to obtain an intermediate-diameter steel wire having a diameter of 1.68 mm.
  • the final material was continuously wet-drawn to produce a steel wire with a diameter of 0.28 mm.
  • a steel wire was manufactured by changing the drawing conditions at this time (however, the temperature of the steel wire immediately after passing through the final die was controlled to 150 as measured by a heat flux thermometer).
  • a steel cord having a 2 + 1 structure was manufactured using a buncher type twisting machine, and samples 37 to 41 (product of the present invention) and samples 42 to 44, respectively. (Comparative product).
  • a steel cord was made by using the same raw material wire to produce a conventional strength steel wire by the conventional method, and this was used as sample 46.
  • Table 8 shows these manufacturing conditions, steel wire characteristics and code characteristics.
  • sample 49 a high-strength steel wire and a cord (comparative product) were prepared by the conventional method using the same wire (C: 0.83 wt%) as the sample 45 of Example 4. This is referred to as sample 49.
  • Table 9 shows these conditions and the characteristics of steel wires and cords.
  • Sample 53 As a raw material, the same wire (C 0.72 wt%) as the samples 47 and 48 in Example 5 was used, and a steel wire having a diameter of 0.32 and the present invention of 2 + 1 were obtained. Steel cord was produced. These are called samples 51 and 52. Also, using the same raw material wire as Sample 47, conventional strength steel wires and cords (conventional products) were manufactured by the conventional method. This is designated as Sample 53.
  • Table 10 shows these manufacturing conditions, steel wire characteristics and code characteristics.
  • the "torsion test” is defined as the distance L between the gripper 6 on the fixed side and the gripper 7 on the movable side in Fig. 2 is set to 300 d (d is the steel wire diameter mm).
  • the straight steel wire W (the steel wire after twisting is not twisted and stretched by hand, etc. without any processing such as by hand) is gripped on the fixed side.
  • a 400 gr grind Lightly apply tension, and in this state, rotate the gripper 7 on the movable side by the motor 9 at a speed of 30 rpm to determine a twist-torque curve until it breaks in one direction. After twisting 10 turns at a time, the rotation is stopped, and the steel wire is twisted back in the opposite direction at the above twisting speed until the steel wire breaks, and determined by taking a twist-torque curve. is there.
  • Rubber permeability means that a single linear cord is put into unvulcanized rubber under the tension of lOO gr and vulcanized to form a sample, and then the cord in the rubber is taken out. The cord was disassembled in the longitudinal direction, and the degree of penetration of the rubber into the cord was visually observed, and it was determined that 100% had completely penetrated the cord.
  • the “fatigue resistance index” is as described in Examples 1 to 3.
  • I-die 2... steel wire, 3 ⁇ steel cord, 4... wet wire drawing conditions
  • the samples of the present invention sambles 37 to 41, samples 47 to 4.8, and sambles 51 to 52, exhibited breaking loads, twisting efficiencies, rubber permeability, Both of the fatigue resistance characteristics are comparable or better than those of samples 45 and 49, which use raw material wires containing 0.80 wt% or more carbon as a raw material (the fatigue resistance is It has the characteristics of "very good.” In addition, it is superior in all characteristics as compared with the conventional sam- bles 46, 50 and 53.
  • Samples 42 to 44 which are comparative products, have poor toughness in the one-way to reverse direction twisting test, have a low ratio of strength after twisting and before twisting, and have a low rubber ratio. Despite satisfactory permeability, fatigue resistance is poor. In the torsion-torque curve in the torsion test, the steel wire before burning the cord and the steel wire after twisting have almost the same curve. Even after twisting, it was defective and twisting did not restore toughness.
  • the steel cord according to the present invention has a good rubber permeability because of the 2 + 1 structure.
  • steel wire has high strength and good toughness, and its twisting efficiency is not inferior to conventional strength materials.
  • the fatigue resistance is particularly excellent, an excellent effect that the reinforcing effect on rubber is high can be obtained.
  • the steel filament of the present invention is used as a reinforcing means for a radial tire for an automobile.
  • it can be used as a reinforcing means for various rubber products such as conveyor belts and high-pressure hoses.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
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Abstract

L'invention concerne un corps filamentaire en acier destiné à être utilisé comme élément de renforcement de divers types de produits en caoutchouc tels que les pneus à carcasse radiale pour automobiles, ledit corps filamenteux en acier étant constitué de fils d'acier et de câblés métalliques constitués d'une pluralité desdits fils. On produit le fil d'acier en utilisant un fil d'acier au carbone contenant 0,70 à 0,75 % en poids de carbone, présentant un diamètre compris entre 0,10 mm et 0,40 mm et des propriétés exprimées de la manière suivante: Y≥-1960d+3580 [Y: résistance à la traction (N/mm2); d: diamètre du fil d'acier (mm)]. Par ailleurs, le taux de réduction du couple du fil d'acier est d'au plus 7 % dans une courbe couple/torsion obtenue dans un essai de couple-torsion dans lequel le fil d'acier est soumis à une torsion dans un sens puis dans le sens inverse. De plus, le câblé d'acier préféré selon l'invention est un câblé produit par torsion de fils de sorte que deux fils d'acier soient d'abord liés entre eux sensiblement parallèlement et qu'un autre fil d'acier soit ensuite enroulé autour des deux fils ainsi liés. Outre les caractéristiques susmentionnées, telles que le diamètre, la résistance à la traction et la ténacité, le rapport B/A entre la résistance B du câblé d'acier après la torsion conjointe des fils et un total A des résistances des fils d'acier avant leur torsion pour former le câblé d'acier est d'au moins 0,935.
PCT/JP1996/000634 1995-03-17 1996-03-14 Corps filamentaire en acier a resistance elevee, destine a renforcer un produit en caoutchouc WO1996029464A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US08/751,872 US5956935A (en) 1995-03-17 1996-11-18 High tensile steel filament member for rubber product reinforcement

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP7/84568 1995-03-17
JP7084568A JP2906025B2 (ja) 1995-03-17 1995-03-17 ゴム製品補強用高強度スチールワイヤおよびスチールコード並びに高強度スチールの製造方法
JP8/70870 1996-03-04
JP8070870A JP2906035B2 (ja) 1996-03-04 1996-03-04 ゴム補強用高強度スチールコード及びラジアルタイヤ

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US08/751,872 Continuation US5956935A (en) 1995-03-17 1996-11-18 High tensile steel filament member for rubber product reinforcement

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WO1996029464A1 true WO1996029464A1 (fr) 1996-09-26

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1731661A1 (fr) * 2004-03-31 2006-12-13 Tokusen Kogyo Company Limited Filament pour caoutchouc de renfort d"une excellente resistance a la corrosion, et composite du filament et caoutchouc

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02256503A (ja) * 1988-12-28 1990-10-17 Bridgestone Corp ビードワイヤ・ゴム複合体
JPH0327188A (ja) * 1989-06-22 1991-02-05 Bridgestone Bekaruto Steel Koode Kk 鋼線およびその製造方法
JPH0328005A (ja) * 1989-06-27 1991-02-06 Bridgestone Corp ラジアルタイヤ

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02256503A (ja) * 1988-12-28 1990-10-17 Bridgestone Corp ビードワイヤ・ゴム複合体
JPH0327188A (ja) * 1989-06-22 1991-02-05 Bridgestone Bekaruto Steel Koode Kk 鋼線およびその製造方法
JPH0328005A (ja) * 1989-06-27 1991-02-06 Bridgestone Corp ラジアルタイヤ

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1731661A1 (fr) * 2004-03-31 2006-12-13 Tokusen Kogyo Company Limited Filament pour caoutchouc de renfort d"une excellente resistance a la corrosion, et composite du filament et caoutchouc
EP1731661A4 (fr) * 2004-03-31 2008-03-05 Tokusen Kogyo Company Ltd Filament pour caoutchouc de renfort d"une excellente resistance a la corrosion, et composite du filament et caoutchouc

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