CN203420163U

CN203420163U - Metal cord thread and rubber tire

Info

Publication number: CN203420163U
Application number: CN201320465533.8U
Authority: CN
Inventors: 王贺; R·德斯皮格拉雷; 朱宏桢
Original assignee: Bekaert NV SA
Current assignee: Bekaert NV SA
Priority date: 2013-08-01
Filing date: 2013-08-01
Publication date: 2014-02-05
Anticipated expiration: 2023-08-01
Also published as: EA039720B1; EA201690308A1

Abstract

The utility model discloses a metal cord thread. The metal cord thread is formed by entwisting a plurality of stranded ropes according to the cord thread entwisting distance. Each stranded rope is formed by entwisting a plurality of metal wires according to the stranded rope entwisting distance. The breaking elongation rate of the metal cord thread is not smaller than 5%. The stranded ropes are provided with stranded rope entwisting angles. The metal cord thread is provided with a cord thread entwisting angle. When the sum of the stranded rope entwisting angles and the cord thread entwisting angle is 20 degrees-29 degrees, the structural elongation rate of the obtained metal cord thread is not smaller than 2.0%. When the sum of the stranded rope entwisting angles and the cord thread entwisting angle is 30 degrees-38 degrees, the structural elongation rate of the obtained metal cord thread is not smaller than 2.5%. When the sum of the stranded rope entwisting angles and the cord thread entwisting angle is 39 degrees-48 degrees, the structural elongation rate of the obtained metal cord thread is not smaller than 3.0%. Preferably, the structural elongation rate of the obtained metal cord thread is not larger than 4.0%. The metal cord thread has the high breaking elongation rate, the high structural elongation rate and the high rubber permeability. The utility model further relates to a rubber tire comprising the metal cord thread.

Description

Metal cords and rubber tyre

Technical field

The utility model relates to a kind of metal cords, also relates to the rubber tyre that comprises this metal cords.

Background technology

As everyone knows, use steel cord to strengthen rubber, especially tire product, apply very extensive." the high steel cord that extends ", it is generally used for and strengthens tire zero band and protective layer as one of steel cord family member.So-called " the high steel cord that extends ", generally refers to that the fracture elongation of steel cord is not less than 5%.Fracture elongation (δ) is one of index of describing material plasticity performance.Fracture elongation is the total deformation Δ L of gauge length section after sample tension failure and the percentage of the ratio of former gauge length L: δ=Δ L/L * 100%.The structural elongation that the fracture elongation of steel cord comprises steel cord itself, for example, for " the high steel cord that extends ", when first sample stretches, what measure at first acquisition is the structural elongation of this steel cord structure itself, after this structural elongation acquires a certain degree, just enters the deformation stage of material itself, final sample tension failure, records the fracture elongation that overall result is this steel cord.

In rubber tyre preparation process, while especially preparing the rubber tyre that comprises the nullity belt being strengthened by height extension steel cord, require the structural elongation of this height extension steel cord also larger, otherwise can cause tire in Vulcanization Process of Rubber, to occur delamination.At present, high steel cord structure 3 * 7 * 0.20mm that extends of widely used tradition, often as the enhancing element of rubber tyre nullity belt.This structure has larger strand spiral angle and cord spiral angle (20.37 °/20.84 °), thereby reaches higher structural elongation and fracture elongation (2.25%/7.17%).But this traditional structure not can solve the strike-through problem of rubber, often cause steel cord well by rubber, not covered, finally cause the serious corrosion of steel cord itself, affected greatly the service life of rubber tyre.Therefore, finding a kind of steel cord that high fracture elongation and high structural elongation meet full strike-through characteristic simultaneously that simultaneously possesses, is to need at present the problem that solves.

On the other hand, for example, when facing some special rubber tyre preparation technology, preparations of super wide tire.As everyone knows, the nullity belt of super wide tire, has and only has the winding of individual layer steel cord as strengthening element, now as the height extension steel cord that strengthens element, must possess king-sized structure extension and could well avoid delamination.As mentioned above, the structural elongation (2.25%) of traditional height extension steel cord structure 3 * 7 * 0.20mm can not meet the preparation requirement of super wide tire, if by continuing to do large strand spiral angle and cord spiral angle to obtaining higher structural elongation, steel cord very easily ruptures so, even if do not rupture by sheer good luck, the mechanical performance of steel cord itself, for example tired, rupture pull force is also greatly affected, and have a greatly reduced quality service life.Therefore, how keeping under the prerequisite of less strand spiral angle and cord spiral angle, make satisfy the demands, there is the more steel cord of macrostructure percentage elongation, for example, the steel cord that structural elongation is greater than 3.0%, is also to need at present the problem that solves.

Utility model content

One of the utility model object is to provide the metal cords of a kind of high fracture elongation and high structural elongation and full strike-through.

Another object of the utility model is to provide a kind of rubber tyre of the metal cords that comprises high fracture elongation and high structural elongation and full strike-through.

According to one of the purpose of this utility model, the technical solution of the utility model is: a kind of metal cords is formed by cord lay pitch twisting by a plurality of strands, each strand is formed by strand lay pitch twisting by a plurality of wires, the fracture elongation of described metal cords is not less than 5%, described strand has strand spiral angle, described metal cords has cord spiral angle, wherein, when described strand spiral angle and described cord spiral angle add and be 20 °～29 °, the structural elongation of the metal cords of gained is not less than 2.0%; When described strand spiral angle and described cord spiral angle add and be 30 °～38 °, the structural elongation of the metal cords of gained is not less than 2.5%; When described strand spiral angle and described cord spiral angle add and be 39 °～48 °, the structural elongation of the metal cords of gained is not less than 3.0%.

Preferably, the structural elongation of this metal cords is not more than 4.0%.

The account form of strand spiral angle and cord spiral angle is as follows:

Strand spiral angle is α,

Wherein " d " is filament diameter, and " Ls " is the strand lay pitch, and " n " is the quantity that comprises monofilament in each strand;

Cord spiral angle is β,

Wherein " d " is filament diameter, and " Lc " is the cord lay pitch, and " m " is the quantity that comprises strand in cord, and " n " is the quantity that comprises monofilament in each strand.

At present, traditional height extends metal cords and can make by following a series of effective methods: the lay pitch that reduces common metal cord, or increase diameter wiry, or increase the quantity of wire strand, in one word, according to above-mentioned spiral angle formula, increase the spiral angle of metal cords, thereby obtain the high metal cords that extends.But the spiral angle of metal cords neither unrestrictedly increase, there is certain limitation.The spiral angle of metal cords increases to the fracture that to a certain degree will cause metal cords; Even if metal cords does not rupture, the continuous increase of metal spiral angle at any time, the mechanical performance of metal cords itself, such as fatigue, rupture pull force etc. also can sharply decline, and has a strong impact on the service life of metal cords.

Different from traditional metal cords production technology, the utility model provides the another kind of high method of extending metal cords that obtains.Metal cords structure of the present utility model is more open, space in metal cords between wire and between strand is larger, fracture elongation and structural elongation higher (not changing under the prerequisite of spiral angle size), while is due to the increase in space, the strike-through performance of metal cords is greatly improved, and meets complete strike-through performance.

According to the utility model, the quantity of strand is preferably 2～7, and in per share strand, quantity wiry is preferably 2～9.

In addition, in described strand, wire cloth is set to individual layer or two-layer structure.The single layer structure that strand can be comprised of wire, namely n * 1 structure; Also can be that wire composition sandwich construction is twisted strand, such as, strand structure is two-layer, (m)+n structure namely, the core thigh layer being formed by (m) one metal wire and the perisphere around core thigh layer being formed by n one metal wire, in core thigh layer, wire can be arranged in parallel and not twist (namely the lay pitch is greater than 300mm), for example: strand structure is (2)+2.So-called " lay pitch ", refers to that wire or strand are round the central shaft of strand or steel cord the advanced axial distance that rotates a circle.

Because steel cord of the present utility model is applied to rubber tyre, the steel wire diameter in steel cord can be the value known to arbitrary those skilled in the art.Preferably, steel wire diameter is 0.10mm～0.60mm, 0.14mm for example, 0.26mm, 0.38mm.

According to the utility model, wire is steel wire, comprises the carbon that is not less than 0.65%, also comprises the materials such as a small amount of manganese, silicon, sulphur, phosphorus.For example, comprise 0.70% carbon, 0.50% manganese, 0.202% silicon, 0.013% sulphur, 0.085% phosphorus, is quality percentage composition.Specifically, for high-carbon steel wire, carbon content is greatly about 0.80%, for example, carbon content 0.78-1.02%, manganese content 0.30%-1.10%, silicone content 0.15%-1.30%, sulfur content is no more than 0.15%, and phosphorus content is no more than 0.02%, is quality percentage composition.In addition, may also comprise some microalloy elements of extra interpolation, the chromium of 0.20%-0.40% for example, 0.20% copper, 0.30% vanadium, is quality percentage composition.

According to the utility model, wire can have coating.Coating is preferably zinc coating or brass coating.Thickness range known to applicable those skilled in the art of thickness of coating, for example, brass coating, thickness is 0.2M μ.

According to one of preferred version of the present utility model, a kind of metal cords, strand number is 3, in per share strand, wire number is 4, and wire diameter is 0.24mm, and strand spiral angle is 13.62 °, cord spiral angle is 14.72 °, two spiral angles add and are 28.34 °, and now the structural elongation of metal cords is 2.42%, and the fracture elongation of metal cords is 6.19%.

According to one of preferred version of the present utility model, a kind of metal cords, strand number is 3, in per share strand, wire number is 4, and wire diameter is 0.26mm, and strand spiral angle is 14.71 °, cord spiral angle is 15.89 °, two spiral angles add and are 30.6 °, and now the structural elongation of metal cords is 2.99%, and the fracture elongation of metal cords is 7.14%.

According to one of preferred version of the present utility model, a kind of metal cords, strand number is 3, in per share strand, wire number is 4, and wire diameter is 0.26mm, and strand spiral angle is 16.11 °, cord spiral angle is 15.89 °, two spiral angles add and are 32 °, and now the structural elongation of metal cords is 3.28%, and the fracture elongation of metal cords is 7.92%.

This steel cord has king-sized structural elongation, often can be applied to for example nullity belt of super wide tire, has and only have individual layer steel cord to be wound around as strengthening element.Review traditional handicraft, if need to meet king-sized structural elongation, for example the structural elongation of steel cord need to be greater than 3.0%, one of effective way that can realize this scheme is to do the spiral angle of large steel cord, but spiral angle can not unconfinedly do greatly, if large especially, steel cord very easily ruptures, even if do not rupture, the mechanical performance of itself, for example fatigue behaviour and rupture pull force also sharply decline.

According to one of preferred version of the present utility model, a kind of metal cords, strand number is 4, in per share strand, wire number is 4, and wire diameter is 0.22mm, and strand spiral angle is 12.52 °, cord spiral angle is 16.43 °, two spiral angles add and are 28.95 °, and now the structural elongation of metal cords is 2.97%, and the fracture elongation of metal cords is 6.69%.

According to another object of the present utility model, technical solutions of the utility model are: a kind of rubber tyre, comprise carcass, band bundled layer, nullity belt and crown, it is characterized in that, described nullity belt comprise metal cords and and the rubber that covers described metal cords, metal cords is formed by cord lay pitch twisting by a plurality of strands, each strand is formed by strand lay pitch twisting by a plurality of wires, the fracture elongation of metal cords is not less than 5%, described strand has strand spiral angle, described metal cords has cord spiral angle, wherein, when described strand spiral angle and described cord spiral angle add and are 20 °～29 °, the structural elongation of the metal cords of gained is not less than 2.0%, when described strand spiral angle and described cord spiral angle add and be 30 °～38 °, the structural elongation of the metal cords of gained is not less than 2.5%, when described strand spiral angle and described cord spiral angle add and be 39 °～48 °, the structural elongation of the metal cords of gained is not less than 3.0%.Preferably, the structural elongation of metal cords is not more than 4.0%.

According to another object of the present utility model, another technical scheme of the present utility model is: a kind of rubber tyre, comprise carcass, band bundled layer and crown, described band bundled layer comprises transition zone, working lining and protective layer, it is characterized in that, described protective layer comprise metal cords and and the rubber of covering metal cord, wherein metal cords is formed by cord lay pitch twisting by a plurality of strands, each strand is formed by strand lay pitch twisting by a plurality of wires, the fracture elongation of metal cords is not less than 5%, described strand has strand spiral angle, described metal cords has cord spiral angle, wherein, when described strand spiral angle and described cord spiral angle add and are 20 °～29 °, the structural elongation of the metal cords of gained is not less than 2.0%, when described strand spiral angle and described cord spiral angle add and be 30 °～38 °, the structural elongation of the metal cords of gained is not less than 2.5%, when described strand spiral angle and described cord spiral angle add and be 39 °～48 °, the structural elongation of the metal cords of gained is not less than 3.0%.Preferably, the structural elongation of metal cords is not more than 4.0%.

As previously mentioned, " lay pitch " refers to that wire or strand are round the central shaft of strand or metal cords the advanced axial distance that rotates a circle.

Accompanying drawing explanation

Accompanying drawing 1 is structural elongation and the fracture elongation test schematic diagram of steel cord in the utility model.

Accompanying drawing 2 is the sectional view of a kind of steel cord 3 * 4 of the present utility model.

Accompanying drawing 3 is the many front views of steel cord 3 * 4 side by side of the present utility model.

Accompanying drawing 4a is traditional steel cord shaping schematic view.

Accompanying drawing 4b is steel cord shaping schematic view of the present utility model.

Accompanying drawing 5 is the sectional view of a kind of steel cord 4 * 4 of the present utility model.

Accompanying drawing 6a is the strike-through sectional view of a kind of steel cord 3 * 4 of the present utility model.

Accompanying drawing 6b is the strike-through sectional view of this traditional a kind of steel cord 3 * 4.

The specific embodiment

In the utility model, the structural elongation of steel cord and the method for testing of fracture elongation are as shown in Figure 1.In Fig. 1, curve 110 is stress strain curves of steel cord, and as shown in Figure 1, then the 110 malformation stages of first experiencing steel cord entered the strain stage; The 120th, and elastic modelling quantity line (get the strain stage any two points c of stress strain curve 110, d, connecting this straight line of 2 is elastic modelling quantity line 120); 120 reverse extending line and the intersection point of abscissa, be denoted as δ ₁; The 130th, and the malformation tropic (get the malformation stage any two points a of stress strain curve 110, b, connecting this straight line of 2 is the malformation tropic 130); 130 reverse extending line and the intersection point of abscissa, be denoted as δ ₀.| δ ₁| with | δ ₀| the structural elongation that adds and be this steel cord; Make the breakaway poing of steel cord---the vertical line of e point (terminal of stress strain curve 110) and abscissa, intersection point is denoted as δ ₂, | δ ₂| be the fracture elongation of this steel cord.

Fig. 2 is the sectional view of embodiment mono-3 * 4 steel cords of the present utility model, and Fig. 3 is its front view (many cord side by side front view).Shown in Fig. 2, steel cord 200 structures are 3 * 4, and steel cord is formed by 3 strand 205 twistings, and per share strand 205 is formed by 4 steel wire 210 twistings.Steel wire 210 diameters are 0.24mm.Strand spiral angle is 13.62 °, and cord spiral angle is 14.72 °, and two spiral angles add and 28.34 °.

Conventional steel cord 200 ' manufacture craft: first 4 steel wires 210 are twisted into strand 205, then by 3 strands of strands 205 according to the method as shown in Fig. 4 a settle at one go be twisted into conventional steel cord 200 ', now the lay pitch is 8mm, every meter twisting 125 circle.And embodiment mono-of the present utility model, by strand 205 according to method as shown in Figure 4 b, twisting completes in two steps.Concrete grammar is as follows: the first step is twisted together 3 strands of strands 205, and now the lay pitch is 5.33mm, every meter of twisting 187.5 circles; The steel cord that second step forms to first step twisting by take-up is reciprocal twisted, makes the lay pitch of steel cord become large, and now the lay pitch is 8mm, in the other direction every meter of twisting 62.5 circles, i.e. every meter of actual twisting 125 circles.Finally obtain steel cord 200 of the present utility model, the strand spiral angle of gained steel cord 200 is 13.62 °, and cord spiral angle is 14.72 °, and two spiral angles add and are 28.34 ° (as shown in Figure 2).

Fig. 5 is the sectional view of embodiment 24 * 4 steel cords of the present utility model.Shown in Fig. 5, steel cord 500 structures are 4 * 4, and steel cord is formed by 4 strand 510 twistings, and per share strand 510 is formed by 4 steel wire 205 twistings.Steel wire 505 diameters are 0.26mm.Strand spiral angle is 14.71 °, and cord spiral angle is 15.89 °, and two spiral angles add and are 30.6 °.

By the utility model embodiment mono-and two and existing product compare test, data are as table 1.

Table 1.

Table 1 has clearly shown compared to existing product, in strand spiral angle and cord spiral angle identical in the situation that, steel cord structure percentage elongation of the present utility model and fracture elongation are all greatly improved, and in tire manufacturing process, just can avoid occurring delamination during the vulcanization of rubber like this; The strike-through performance of steel cord is greatly improved simultaneously, and (strike-through pressure drop is lower, and strike-through performance is better; Strike-through pressure drop 0% is complete strike-through; The concrete method of measuring rubber osmosis is referring to the open text CN102666972A of Chinese patent application), as shown in Fig. 6 a and 6b, steel cord structure of the present utility model 3 * 4(is as Fig. 2 steel cord 200) with traditional same structure steel cord 200 ' compare, steel cord 200 of the present utility model obviously reaches the effect of complete strike-through, and traditional steel cord 200 ' strand inner rubber can not be infiltrated substantially, strand inside very easily produces steel wire corrosion.And steel cord structure of the present utility model is more open, rubber not only can well infiltrate between strand and strand, more can well infiltrate strand inside, thereby well avoid the corrosion of steel wire, strengthen the service life of steel cord, be more suitable for enhancing tire, especially strengthen the nullity belt in tire.

In addition, another existing product also has identical steel cord structure 3 * 4 * 0.24 with the present embodiment one (steel cord 200), but this existing product is close with this example structure percentage elongation, and its measuring mechanical property data are as shown in table 2.

Table 2

Even if table 2 has clearly shown to reach close structural elongation, existing product has larger strand spiral angle and larger cord spiral angle, so rupture pull force obviously declines compared to steel cord of the present utility model; And steel cord of the present utility model not only has less strand spiral angle and cord spiral angle, there is less cord line density simultaneously, thereby there is lighter cord weight, economical and practical; The not only environmental protection of rubber tyre being strengthened by this steel cord, and there is less resistance to rolling.

As the 3rd specific embodiment of the present utility model, 5 * 2 steel cords, wherein to count n be 5 to strand, and in per share strand, to count m be 2 to steel wire, and steel wire diameter is 0.26mm, and strand spiral angle is 10.52 °, 19.16 ° of cord spiral angles, two spiral angles add and are 29.68 °; Steel cords break percentage elongation is 6.27%, and steel cord structure percentage elongation is 2.78%.

The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model, all within spirit of the present utility model and principle, any modification of making, be equal to replacement, improvement etc., within all should being included in scope of the present utility model.

Claims

1. a metal cords, described metal cords is formed by cord lay pitch twisting by a plurality of strands, each strand is formed by strand lay pitch twisting by a plurality of wires, the fracture elongation of described metal cords is not less than 5%, described strand has strand spiral angle, and described metal cords has cord spiral angle, it is characterized in that, when described strand spiral angle and described cord spiral angle add and be 20 °～29 °, the structural elongation of the metal cords of gained is not less than 2.0%; When described strand spiral angle and described cord spiral angle add and be 30 °～38 °, the structural elongation of the metal cords of gained is not less than 2.5%; When described strand spiral angle and described cord spiral angle add and be 39 °～48 °, the structural elongation of the metal cords of gained is not less than 3.0%.

2. metal cords according to claim 1, is characterized in that, the structural elongation of described metal cords is not more than 4.0%.

3. metal cords according to claim 2, is characterized in that, described strand quantity is 2～7, and in per share strand, quantity wiry is 2～9.

4. according to the metal cords described in any one in claim 1-3, it is characterized in that, described wire diameter is 0.10mm～0.60mm.

5. according to the metal cords described in any one in claim 1-3, it is characterized in that, in described strand, wire cloth is set to individual layer or two-layer structure.

6. a rubber tyre, comprises carcass, band bundled layer, nullity belt and crown, it is characterized in that, described nullity belt comprise metal cords as described in any one in claim 1-5 and and cover as described in the rubber of metal cords.

7. a rubber tyre; comprise carcass, band bundled layer and crown; described band bundled layer comprises transition zone, working lining and protective layer, it is characterized in that, described protective layer comprise metal cords as described in any one in claim 1-5 and and cover as described in the rubber of metal cords.