EP2801659A1 - Metallcord mit runden und nichtrundem Filamenten - Google Patents

Metallcord mit runden und nichtrundem Filamenten Download PDF

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Publication number
EP2801659A1
EP2801659A1 EP13166603.4A EP13166603A EP2801659A1 EP 2801659 A1 EP2801659 A1 EP 2801659A1 EP 13166603 A EP13166603 A EP 13166603A EP 2801659 A1 EP2801659 A1 EP 2801659A1
Authority
EP
European Patent Office
Prior art keywords
cord
metal
steel
filaments
section
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP13166603.4A
Other languages
English (en)
French (fr)
Inventor
Roel DESPIEGELAERE
Jef Wilmots
Rik Mullebrouck
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bekaert NV SA
Original Assignee
Bekaert NV SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bekaert NV SA filed Critical Bekaert NV SA
Priority to EP13166603.4A priority Critical patent/EP2801659A1/de
Publication of EP2801659A1 publication Critical patent/EP2801659A1/de
Withdrawn legal-status Critical Current

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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
    • 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
    • D07B2201/2002—Wires or filaments characterised by their cross-sectional shape
    • 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
    • D07B2201/2002—Wires or filaments characterised by their cross-sectional shape
    • D07B2201/2003—Wires or filaments characterised by their cross-sectional shape flat
    • 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
    • D07B2201/2002—Wires or filaments characterised by their cross-sectional shape
    • D07B2201/2005—Wires or filaments characterised by their cross-sectional shape oval
    • 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
    • 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
    • D07B2201/2024—Strands twisted
    • D07B2201/2027—Compact winding
    • D07B2201/2028—Compact winding having the same lay direction and lay pitch
    • 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
    • D07B2201/2036—Strands characterised by the use of different wires or filaments
    • 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
    • D07B2205/3035—Pearlite
    • 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
    • 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
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2401/00—Aspects related to the problem to be solved or advantage
    • D07B2401/20—Aspects related to the problem to be solved or advantage related to ropes or cables
    • D07B2401/208—Enabling filler penetration
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2501/00—Application field
    • D07B2501/20—Application field related to ropes or cables
    • D07B2501/2007—Elevators
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2501/00—Application field
    • D07B2501/20—Application field related to ropes or cables
    • D07B2501/2046—Tire cords
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2501/00—Application field
    • D07B2501/20—Application field related to ropes or cables
    • D07B2501/2076—Power transmissions

Definitions

  • the invention relates to a metal cord for reinforcing elastomer product.
  • the invention also relates to an elastomer product reinforced by the metal cord.
  • a steel cord for reinforcing the rubber tire is always required to have a good rubber penetration.
  • a good rubber penetration can help to prevent the moisture from penetrating into the steel cord and can help to reduce the friction between the steel filaments. Hence the corrosion of the steel cord is prevented and the abrasion of the filaments is reduced. The result is that the lifetime of the rubber tire is improved.
  • one or more of the individual steel filaments may be subjected to a plastic deformation, either before or after the cord making, in order to create gaps between the filaments and to allow rubber to penetrate.
  • This plastic deformation may be a helical preforming, a polygonal preforming or a crimping between a pair of toothed wheels. This plastic deformation requires an additional step in the whole manufacturing process.
  • JP5035889U discloses a steel cord with a structure of n ⁇ 1, wherein at least one of the steel filament in the steel cord is the oval or flat steel filament, and the oval or flat steel filament has a smaller twisting pitch than the remainder steel filaments of the steel cord, the oval or flat filament has a twisting pitch is 0.3-0.7 times the twisting pitch of the steel cord.
  • the rubber penetration of the steel cord is good, however, the cost of the steel cord is high, and the strength of the steel cord and the fatigue resistance of the steel cord are low and unacceptable.
  • the primary object of the invention is to provide a metal cord, e.g. a steel cord with high rubber penetration, high fatigue resistance and high strength.
  • Another object of the invention is to provide an elastomer product with longer lifetime.
  • a metal cord for reinforcing elastomer product comprises n metal filaments twisted together in a cord twisting direction, all the metal filaments have the same cord twisting pitch, and at least one metal filament has a non-round cross-section.
  • the invention metal cord comprises two kind of metal filaments, one is the metal filament with non-round cross-section and another is the metal filament with round cross-section.
  • the inventor is surprized to find that, by combining the metal filament with non-round cross-section and the metal filament with round cross-section together, the rubber penetration of the steel cord is improved, while the strength of the steel cord and the fatigue resistance of the steel cord are still very high.
  • the metal cord of JP5035889U comprises round metal filament and non-round metal filament, and the non-round metal filament has a smaller twisting pitch than the cord twisting pitch, thereby more cavities among the steel filaments are created, as a result, the rubber penetration of the metal cord is improved.
  • the metal cord of JP5035889U has high rubber penetration, the strength and fatigue resistance of the metal cord are quite poor.
  • the present invention makes all the metal filaments have the same twisting pitch. In theory, the rubber penetration of the metal cord will turn bad if making the twisting pitch of the non-round metal filament being the same as the cord twisting pitch.
  • the invention metal cord saves one step of manufacturing process - making the twisting pitch of non-round metal filament being smaller than the twisting pitch of round metal filament, so the invention metal cord saves a lot of cost.
  • At least the metal filament having a non-round cross-section does not show twist or rotation along its own axes along the metal cord. This creates more interspaces between the metal filament with non-round cross-section and the metal filament with round cross-section. The rubber penetration is much better, and the strength and the fatigue resistance are higher.
  • the remainder metal filaments do not show twist or rotation along its own axes along the metal cord or have a twist or rotation along its own axes along the metal cord.
  • each individual metal filament has a twist or rotation along its own axes along the metal cord, the twist or rotation is in the same direction as the cord twisting direction.
  • the number of the metal filament with non-round cross-section is more than one.
  • n metal filaments are twisted together in a cord twisting direction, all the metal filaments have a same cord twisting pitch, this means that the metal cord is made by twisting n metal filaments in one single step (this structure is so-called n ⁇ 1).
  • n ranges from 2 to 9. More preferably, n ranges from 3 to 6.
  • all the metal filaments have the same cord twisting pitch.
  • the cord twisting pitch ranges from 4mm to 20mm.
  • not more than 50% of the filaments have a non-round cross-section.
  • the remainder metal filaments of the metal cord i.e. those with a round cross-section, are alternated with at least one metal filament with a non-round cross-section.
  • non-round cross-section may be flat, oval or rectangular cross-section.
  • the flat, oval or rectangular cross-section has a width W and a thickness T, wherein 1.05 ⁇ W/ ⁇ T3. More preferably, 1.1 ⁇ W/T ⁇ 3; most preferably, 1.2 ⁇ W/T ⁇ 3.
  • a use of the metal cord is as rubber reinforcement.
  • the metal cord comprising n metal filaments twisted together in a cord twisting direction, wherein all the metal filaments have the same cord twisting pitch and at least one metal filament has a non-round cross-section, is for reinforcing rubber product.
  • the rubber product may be a rubber tire or a rubber belt.
  • the metal cord of the present invention is particularly adapted to reinforce the breaker or belt ply or layer of a tire.
  • Figure 1 shows the cross-sectional view of a prior-art steel cord with a structure of 4x1.
  • Figure 2(a) to 2(b) shows the cross-sectional view of an invention steel cord with a structure of 4 ⁇ 1.
  • Figure 3(a) to 3(b) shows the cross-sectional view of another invention steel cord with a structure of 4 ⁇ 1.
  • Figure 4(a) to 4(c) shows the cross-sectional view of a flat, oval or rectangular steel filament.
  • Figure 5(a) to 5(c) shows the cross-sectional view of other invention steel cord.
  • the metal cord of the present invention is a steel cord which comprises a number of steel filaments.
  • the steel filament is made from a wire rod.
  • the wire rod is firstly cleaned by mechanical descaling and / or by chemical pickling in a H 2 SO 4 or HCl solution in order to remove the oxides present on the surface.
  • the wire rod is then rinsed in water and is dried.
  • the dried wire rod is then subjected to a first series of dry drawing operations in order to reduce the diameter until a first intermediate diameter.
  • Patenting means first austenitizing until a temperature of about 1000°C followed by a transformation phase from austenite to pearlite at a temperature of about 600°C - 650°C. After further cooling, the steel wire is then ready for further mechanical deformation.
  • the steel wire is further dry drawn from the first intermediate diameter d1 until a second intermediate diameter d2 in a second number of diameter reduction steps.
  • the second diameter d2 typically ranges from 1.0 mm to 2.5 mm.
  • the steel wire is subjected to a second patenting treatment, i.e. austenitizing again at a temperature of about 1000°C and thereafter quenching at a temperature of 600°C to 650°C to allow for transformation to pearlite.
  • a second patenting treatment i.e. austenitizing again at a temperature of about 1000°C and thereafter quenching at a temperature of 600°C to 650°C to allow for transformation to pearlite.
  • the steel wire is usually provided with a brass coating: copper is plated on the steel wire and zinc is plated on the copper. A thermo-diffusion treatment is applied to form the brass coating.
  • the brass-coated steel wire is then subjected to a final series of cross-section reductions by means of wet drawing machines.
  • the final product is a steel filament with a carbon content above 0.60 percent by weight, with a tensile strength typically above 2000 MPa and adapted for the reinforcement of elastomeric products.
  • Steel filaments adapted for the reinforcement of tyres typically have filaments with a final diameter ranging from 0.05 mm to 0.60 mm, e.g. from 0.10 mm to 0.40 mm.
  • filament diameters are 0.10 mm, 0.12 mm, 0.15 mm, 0.175 mm, 0.18 mm, 0.20 mm, 0.22 mm, 0.245 mm, 0.28 mm, 0.30 mm, 0.32 mm, 0.35 mm, 0.38 mm, 0.40 mm.
  • the steel filaments may have big diameters like 4mm to 13mm for other applications such as belt for elevator.
  • the composition of steel filament has a minimum carbon content of 0.65% (even higher than 0.80%), a manganese content ranging from 0.40% to 0.70%, a silicon content ranging from 0.15% to 0.30%, a maximum sulphur content of 0.03%, a maximum phosphorus content of 0.30%, all percentages being percentages by weight. There are only traces of copper, nickel and / or chromium.
  • steel filaments are rolled by a pair of rollers to change the cross-section from round to non-round, i.e. flat, oval or rectangular.
  • non-round steel filaments are obtained.
  • the flat wires have a pair of flat surfaces and a pair of round edges.
  • Figure 1 illustrates a prior art steel cord with a structure of 4 ⁇ 1.
  • the steel cord 100 has four steel filaments 105 twisted together, all the steel filaments 105 have the same twisting pitch being 14mm.
  • FIG 2a to 2b illustrates an invention steel cord with a structure of 4 ⁇ 1.
  • the steel cord 200 has three steel filaments 105 and one steel filament 210 twisted together.
  • the steel filament 105 has a round cross-section and the steel filament 210 has a flat cross-section.
  • the steel filaments 105 and the steel filament 210 have a same cord twisting pitch being 14mm.
  • the steel cord 200 is made by a method called 'cabling', by means of a tubular twisting machine.
  • Figure 2a and Figure 2b are the cross-sectional view of the steel cord 200
  • Figure 2b is the cross-sectional view after twisting the steel cord 200 in Figure 2a with 90°. So each individual steel filament 105 or 210 does not show twist or rotation along its own axes along the steel cord 200.
  • Figure 3a to 3b illustrates an invention steel cord with a structure of 4 ⁇ 1.
  • the steel cord 300 has two steel filaments 105 and two steel filaments 210 twisted together.
  • the steel filament 105 has a round cross-section and the steel filament 210 has a flat cross-section.
  • the steel filaments 105 and the steel filament 210 have the same cord twisting pitch being 14mm.
  • the steel cord 300 is made by a method called 'bunching', e.g. by means of a double-twisting machine.
  • Figure 3a and Figure 3b are the cross-sectional view of the steel cord 300
  • Figure 3b is the cross-sectional view after twisting the steel cord 300 in Figure 2a with a degree of 90.
  • the individual steel filament 105 or 210 has a twist or rotation along its own axes along the steel cord, the twist or rotation is in the same direction as the cord twisting direction.
  • the invention steel cords 200 and 300 provide an improved rubber penetration without losing the strength and the fatigue resistance too much.
  • the rubber penetration of the steel cord is greatly improved, the rubber tire reinforced by the invention steel cord has a longer lifetime.
  • the strength and the fatigue resistance of the invention steel cord are much higher while the rubber penetration is almost the same. Thereby, the rubber tire reinforced by the invention steel cord has a longer lifetime.
  • the invention steel cord saves such an additional twisting step, thereby saves the cost.
  • a rubber penetration test shows the advantage of the invention steel cord 200 and 300 compared with the prior art steel cord 100.
  • the rubber penetration test is so-called air drop method, the lower the air%, the better the rubber penetration.
  • Table 1 shows the test result.
  • Figure 4a to 4c illustrate some steel filaments with non-round cross-section.
  • Figure 5a to 5c illustrate some embodiments of the invention.
  • Figure 5a illustrates a steel cord 510 with a structure of 3x1, wherein one of three steel filaments is flat steel filament, the one flat steel filament does not show twist or rotation along its own axes along the steel cord, and the other two round steel filaments have a twist or rotation along its own axes along the steel cord.
  • Figure 5b illustrates a steel cord 520 with a structure of 5 ⁇ 1, wherein one of five steel filaments is flat steel filament.
  • Figure 5c illustrates a steel cord 530 with a structure of 6 ⁇ 1, wherein three of six steel filaments are flat steel filaments, and the three round filaments are alternated with the three flat steel filaments.
  • the steel cord has high rubber penetration, high strength and high fatigue resistance
  • the steel cord can be used for reinforcing elastomer product, i.e. rubber tire or rubber belt.

Landscapes

  • Ropes Or Cables (AREA)
  • Tires In General (AREA)
EP13166603.4A 2013-05-06 2013-05-06 Metallcord mit runden und nichtrundem Filamenten Withdrawn EP2801659A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP13166603.4A EP2801659A1 (de) 2013-05-06 2013-05-06 Metallcord mit runden und nichtrundem Filamenten

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13166603.4A EP2801659A1 (de) 2013-05-06 2013-05-06 Metallcord mit runden und nichtrundem Filamenten

Publications (1)

Publication Number Publication Date
EP2801659A1 true EP2801659A1 (de) 2014-11-12

Family

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Family Applications (1)

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EP13166603.4A Withdrawn EP2801659A1 (de) 2013-05-06 2013-05-06 Metallcord mit runden und nichtrundem Filamenten

Country Status (1)

Country Link
EP (1) EP2801659A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022245033A1 (ko) * 2021-05-20 2022-11-24 홍덕산업(주) 타이어 벨트 플라이 보강용 스틸코드

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2028393A (en) * 1978-08-22 1980-03-05 Sodetal Metal cord and process for its manufacture
US4709544A (en) * 1985-04-29 1987-12-01 Compagnie Generale Des Etablissements Michelin Reinforcement assembly having a layer comprising a shaped thread: articles comprising such assemblies
JPS63295781A (ja) * 1987-05-21 1988-12-02 東洋ゴム工業株式会社 ラジアルタイヤ
JPH02127581A (ja) * 1988-11-05 1990-05-16 Kanai Hiroyuki スチールコードの製造方法およびその装置
JPH0530192U (ja) * 1991-09-30 1993-04-20 金井 宏之 ゴム製品補強用スチールコード
JPH0535889U (ja) 1991-10-14 1993-05-14 金井 宏之 ゴム製品補強用スチールコード
JPH05124402A (ja) * 1991-11-05 1993-05-21 Yokohama Rubber Co Ltd:The 空気入りラジアルタイヤ
JPH0545089U (ja) * 1991-11-05 1993-06-18 東京製綱株式会社 スチールコード
JPH1025675A (ja) * 1996-07-10 1998-01-27 Bridgestone Corp 空気入りタイヤ
DE19709884A1 (de) * 1997-03-11 1998-09-17 Continental Ag Verstärkungscord für eine Gürtellage oder eine Karkassenlage eines Fahrzeugluftreifens

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2028393A (en) * 1978-08-22 1980-03-05 Sodetal Metal cord and process for its manufacture
US4709544A (en) * 1985-04-29 1987-12-01 Compagnie Generale Des Etablissements Michelin Reinforcement assembly having a layer comprising a shaped thread: articles comprising such assemblies
JPS63295781A (ja) * 1987-05-21 1988-12-02 東洋ゴム工業株式会社 ラジアルタイヤ
JPH02127581A (ja) * 1988-11-05 1990-05-16 Kanai Hiroyuki スチールコードの製造方法およびその装置
JPH0530192U (ja) * 1991-09-30 1993-04-20 金井 宏之 ゴム製品補強用スチールコード
JPH0535889U (ja) 1991-10-14 1993-05-14 金井 宏之 ゴム製品補強用スチールコード
JPH05124402A (ja) * 1991-11-05 1993-05-21 Yokohama Rubber Co Ltd:The 空気入りラジアルタイヤ
JPH0545089U (ja) * 1991-11-05 1993-06-18 東京製綱株式会社 スチールコード
JPH1025675A (ja) * 1996-07-10 1998-01-27 Bridgestone Corp 空気入りタイヤ
DE19709884A1 (de) * 1997-03-11 1998-09-17 Continental Ag Verstärkungscord für eine Gürtellage oder eine Karkassenlage eines Fahrzeugluftreifens

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022245033A1 (ko) * 2021-05-20 2022-11-24 홍덕산업(주) 타이어 벨트 플라이 보강용 스틸코드
KR20220157003A (ko) * 2021-05-20 2022-11-29 홍덕산업(주) 타이어 벨트 플라이 보강용 스틸코드

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