EP0466720B1 - Stahlkabel mit verbessertem ermüdungswert - Google Patents

Stahlkabel mit verbessertem ermüdungswert Download PDF

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Publication number
EP0466720B1
EP0466720B1 EP90904817A EP90904817A EP0466720B1 EP 0466720 B1 EP0466720 B1 EP 0466720B1 EP 90904817 A EP90904817 A EP 90904817A EP 90904817 A EP90904817 A EP 90904817A EP 0466720 B1 EP0466720 B1 EP 0466720B1
Authority
EP
European Patent Office
Prior art keywords
filaments
strand
diameter
strands
cord
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.)
Expired - Lifetime
Application number
EP90904817A
Other languages
English (en)
French (fr)
Other versions
EP0466720A1 (de
Inventor
Freddy Baillievier
Huysentruyt Bernard
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 AT90904817T priority Critical patent/ATE97707T1/de
Publication of EP0466720A1 publication Critical patent/EP0466720A1/de
Application granted granted Critical
Publication of EP0466720B1 publication Critical patent/EP0466720B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • D07B2201/2006—Wires or filaments characterised by a value or range of the dimension given
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2015—Strands
    • D07B2201/2023—Strands with core
    • 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
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2047—Cores
    • D07B2201/2051—Cores characterised by a value or range of the dimension given
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2047—Cores
    • D07B2201/2052—Cores characterised by their structure
    • D07B2201/2059—Cores characterised by their structure comprising wires
    • D07B2201/206—Cores characterised by their structure comprising wires arranged parallel to the axis
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2047—Cores
    • D07B2201/2066—Cores characterised by the materials used
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2207/00—Rope or cable making machines
    • D07B2207/20—Type of machine
    • D07B2207/207—Sequential double twisting devices
    • D07B2207/208—Sequential double twisting devices characterised by at least partially unwinding the twist of the upstream double twisting step
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B3/00—General-purpose machines or apparatus for producing twisted ropes or cables from component strands of the same or different material
    • D07B3/08—General-purpose machines or apparatus for producing twisted ropes or cables from component strands of the same or different material in which the take-up reel rotates about the axis of the rope or cable or in which a guide member rotates about the axis of the rope or cable to guide the rope or cable on the take-up reel in fixed position and the supply reels are fixed in position
    • D07B3/10—General-purpose machines or apparatus for producing twisted ropes or cables from component strands of the same or different material in which the take-up reel rotates about the axis of the rope or cable or in which a guide member rotates about the axis of the rope or cable to guide the rope or cable on the take-up reel in fixed position and the supply reels are fixed in position with provision for imparting more than one complete twist to the ropes or cables for each revolution of the take-up reel or of the guide member
    • D07B3/106—General-purpose machines or apparatus for producing twisted ropes or cables from component strands of the same or different material in which the take-up reel rotates about the axis of the rope or cable or in which a guide member rotates about the axis of the rope or cable to guide the rope or cable on the take-up reel in fixed position and the supply reels are fixed in position with provision for imparting more than one complete twist to the ropes or cables for each revolution of the take-up reel or of the guide member characterised by comprising two bows, both guiding the same bundle to impart a twist

Definitions

  • the invention relates to a steel cord for the reinforcement of elastomers, comprising two strands of at least two filaments each so as to form an m + n -structure, where m is the number of filaments of the first strand and n the number of filaments of the second strand, m and n being greater than or equal to two.
  • the steel cord according to the invention is particularly suitable for use as a reinforcement of rubber articles such as tires, and more particularly for use as a reinforcement of breaker layers in a tire.
  • Steel cords for use as a reinforcement of breaker layers in a tire conveniently comprise steel filaments having a diameter between 0.05 mm and 0.60mm, preferably between 0.15 and 0.45 mm.
  • a conventional steel composition for such steel cords is a carbon content above 0.65 %, preferably above 0.80 %, e.g. 0.83 % or 0.85 %, a manganese content between 0.40 and 0.70 %, a silicon content between 0.15 and 0.30 %, and maximum sulphur and phosphorus contents of 0.03 %.
  • the invention is not limited to such a steel composition.
  • Other elements such as chromium, nickel or boron may also be added.
  • the steel cord usually has a rubber adherable layer such as a copper, zinc, or brass alloy.
  • n x 1 -constructions occupy a special place.
  • These are constructions with n filaments twisted together with the same twist pitch and in the same twist sense, n is an integer number between 3 and 5.
  • the problem with these constructions is that they have a central void where rubber cannot penetrate during vulcanisation and where moisture may easily enter and cause corrosion.
  • a solution to this problem has been given by the open n x 1 -constructions.
  • These are constructions where one or more filaments are kept apart from each other by giving them a specified preformation during the twisting process. However, this preformation must exceed a certain limit in order to avoid closing the steel cord when this is put under tension during the vulcanisation process. The problem is then that too high a preformation may cause an irregular cord aspect and instability.
  • a steel cord for the reinforcement of elastomers which comprises two strands of at least two filaments each. These strands are twisted around each other and form helicoids of a same pitch.
  • the filaments of the first strand have a pitch differing from the pitch of said helicoids and have a value of more than 300 mm.
  • the filaments of the second strand have the same pitch as the helicoids and are twisted in the same sense as the helicoids. All the filaments of both strands have a diameter between 0.08 and 0.45 mm.
  • the diameter of the filaments of one of the strands is at least 0.02 mm greater than the diameter of the filaments of the other of the strands.
  • the diameter of the filaments of the second strand is at least 0.02 mm greater than the diameter of the filaments of the first strand, and preferably up to 0.12 mm greater than the diameter of the filaments of the first strand.
  • m + n -construction is provided, where m is the number of filaments of the first strand and n the number of filaments of the second strand.
  • the filaments conveniently have a circular cross-section, but this is not necessary.
  • "diameter” means the diameter of a circular cross-section with the same surface as the cross-section of the filaments.
  • the filaments within one strand conveniently have the same diameter, but small differences in the range of 0.01 mm - 0.02 mm may occur.
  • the fatigue limit of the cord according to the invention is much higher than the fatigue limit of a conventional m + n -construction with the same cross-sectional surface. This is surprising because the diameter of the filaments of one strand has been decreased with respect to the conventional m + n -construction and the diameter of the filaments of the other strand has been increased with respect to the conventional m + n -construction in order to obtain about the same cross-sectional surface and hence reinforcing effect. It is hereby understood that, as is generally known in the art, decreasing the diameter of filaments increases the fatigue limit and increasing the diameter of filaments decreases the fatigue limit.
  • the number of steel filaments in the first strand is equal to the number of steel filaments in the second strand and most preferably this number is equal to two.
  • the filaments of one strand have a normal tensile strength and the filaments of the other strand have a high tensile strength. If the filaments of the first strand have the smaller diameter and have a high tensile strength and the filaments of the second strand have the greater diameter and have a normal tensile strength then the loss in reinforcing strength of the first strand with regard to the second strength due to the smaller diameters may be compensated so that both strands equally contribute to the tensile strength of the whole cord. However, this is not necessary : the filaments of the first strand having the smaller diameter may also have a normal tensile strength while the filaments of the second strand having the greater diameter have a high tensile strength.
  • the overall diameter of the cord may be decreased without loss of tensile strength with regard to m + n-cords with all filaments having a normal tensile strength.
  • FIGURE 1 represents a cord 1 according to the present invention.
  • the cord consists of a first strand having two filaments 11 and a second strand also having two filaments 12.
  • the cross-section of the filaments 11 of the first strand is shaded.
  • the filaments 11 have a diameter of 0.24 mm and the filaments 12 have a diameter of 0.28 mm.
  • the two strands are twisted around each other with a twist pitch p of 15 mm.
  • the twist pitch p conveniently lies between 30 and 100 times the average diameter of the filaments and preferably between 40 and 80 times the average diameter of the filaments.
  • the filaments 12 of the second strand are twisted in the same sense with the same twist pitch p while the filaments 11 of the first strand remain substantially parallel to each other, i.e. they have an infinite twist pitch.
  • FIGURE 2 represents a double-twisting apparatus 2 for manufacturing a cord acccrding to the present invention.
  • the filaments 11 of the first strand are drawn from bobbins 21 and pass through the holes 231 of a guiding plate 23 and come together at a first guiding pulley 24 of the double-twister 2 where they are provisionally twisted together. They pass further over a flyer 25 and over a reversing pulley 26.
  • Two bobbins 27 are stationarily mounted inside the rotor of the double-twister 2.
  • the filaments 12 of the second strand are drawn from these bobbins 27 and pass through the holes 281 of a guiding plate 28 and come together with the provisionally twisted filaments 11 at the cabling die 29.
  • the filaments 11 and 12 pass over reversing pulley 210, flyer 211 and guiding pulley 212 to the winding unit 213. Between the cabling die 29 and the guiding pulley 212 the filaments 11 are untwisted so as to form a first strand consisting of substantially parallel filaments 11, while the filaments 12 are twisted with the same pitch and in the same direction as the two strands.
  • NT normal tensile, i.e. a tensile strength below the value of formula (I);
  • HT high tensile, i.e. a tensile strength above the value of formula (I)) :
  • a second test reveals an additional advantage of the cord according to the invention, namely a better behaviour under compression.
  • the same cords as mentioned under Test 1 have been compared with each other.
  • the buckling stress, the deformation at the buckling stress, and the Young's modulus in compression have been measured for these cords.
  • the buckling stress is a measure for the maximum compression force taken up by the steel cord when embedded in rubber. The greater the buckling stress the greater this maximum compression force.
  • the deformation is the deformation of the cord in rubber when subjected to this maximum compression.
  • a high Young's modulus in compression means a cord which does not allow high deformations under compression whereas a low Young's modulus in compression allows high deformations under compression. Further details about these features and their method of measurement may be found in the paper by Bourgois L., Survey of Mechanical Properties of Steel Cord and Related Test Methods, Tire Reinforcement and Tire Performance, ASTM STP 694, R.A. Fleming and D.I. Livingston, Eds., American Society for Testing and Materials, 1979, pp. 19-46. Table 2 mentions the results :
  • a third test has evaluated the influence of the diameter difference between the two strands on the cord properties. Following cords have been evaluated :

Landscapes

  • Ropes Or Cables (AREA)
  • Tires In General (AREA)
  • Reinforced Plastic Materials (AREA)

Claims (8)

  1. Stahlseil (1) zum Verstärken von Elastomeren, wobei dieses Stahlseil (1) zwei Litzen mit jeweils wenigstens zwei Drähten (11, 12) umfaßt, wobei die Litzen umeinandergedrallt sind und Schraubengebilde gleicher Steigung bilden, wobei die Drähte (11) der ersten Litze eine Steigung haben, die sich von der Steigung dieser Schraubengebilde unterscheidet und einen Wert von mehr als 300 mm hat, wobei die Drähte (12) der zweiten Litze die gleiche Steigung wie die Schraubengebilde haben und im gleichen Sinne wie diese Schraubengebilde gedrallt sind, und wobei alle Drähte beider Litzen einen Durchmesser zwischen 0,08 und 0,45 mm haben, dadurch gekennzeichnet, daß der Durchmesser der Drähte einer dieser Litzen wenigstens 0,02 mm größer als der Durchmesser der Drähte der jeweils anderen dieser Litzen ist.
  2. Stahlseil (1) nach Anspruch 1, dadurch gekennzeichnet, daß der Durchmesser der Drähte (12) der zweiten Litze wenigstens 0,02 mm größer als der Durchmesser der Drähte (11) der ersten Litze ist.
  3. Stahlseil nach einem der Ansprüche 1 bis 2, dadurch gekennzeichnet, daß der Durchmesser der Drähte (12) der zweiten Litze bis zu 0,12 mm größer als der Durchmesser der Drähte (11) der ersten Litze ist.
  4. Stahlseil nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Anzahl der Drähte (11) in der ersten Litze gleich der Anzahl der Drähte (12) in der zweiten Litze ist.
  5. Stahlseil nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß jede der Litzen aus zwei Drähten besteht.
  6. Stahlseil nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Drähte einer der Litzen eine hohe Zugfestigkeit haben, während die Drähte der anderen Litze eine normale Zugfestigkeit haben.
  7. Gummiprodukt, umfassend Stahlseile gemäß einem der Ansprüche 1 bis 6.
  8. Gummireifen, umfassend Stahlseile nach einem der Ansprüche 1 bis 6.
EP90904817A 1989-04-03 1990-03-22 Stahlkabel mit verbessertem ermüdungswert Expired - Lifetime EP0466720B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90904817T ATE97707T1 (de) 1989-04-03 1990-03-22 Stahlkabel mit verbessertem ermuedungswert.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP89200838 1989-04-03
EP89200838 1989-04-03

Publications (2)

Publication Number Publication Date
EP0466720A1 EP0466720A1 (de) 1992-01-22
EP0466720B1 true EP0466720B1 (de) 1993-11-24

Family

ID=8202353

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90904817A Expired - Lifetime EP0466720B1 (de) 1989-04-03 1990-03-22 Stahlkabel mit verbessertem ermüdungswert

Country Status (12)

Country Link
EP (1) EP0466720B1 (de)
JP (1) JPH04506235A (de)
KR (1) KR920701564A (de)
AU (1) AU630940B2 (de)
BR (1) BR9007261A (de)
CA (1) CA2050922A1 (de)
DE (1) DE69004795T2 (de)
ES (1) ES2049026T3 (de)
MX (1) MX173016B (de)
TR (1) TR25281A (de)
WO (1) WO1990012145A1 (de)
ZA (1) ZA901611B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10487448B2 (en) 2014-05-08 2019-11-26 Nv Bekaert Sa Steel cord with reduced residual torsions

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69708611T2 (de) * 1996-03-11 2002-05-08 Bekaert Sa Nv Aus zwei gruppen von filamenten (m+n) bestehendes stahlseil
BR0306571B1 (pt) * 2002-10-11 2012-12-25 cabo de cordÕes, tecido compàsito e pneumÁtico para veÍculo industrial.

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2477584A1 (fr) * 1980-03-06 1981-09-11 Sodetal Develop Fil Metallique Cables metalliques ameliores pour le renforcement des articles en caoutchouc, procede et dispositifs de fabrication
NL191315C (nl) * 1981-05-08 1995-05-16 Bekaert Sa Nv Kabel voor het versterken van elastomeer materiaal en werkwijze voor het vervaardigen van een dergelijke kabel.
US4506500A (en) * 1982-04-10 1985-03-26 Tokusen Kogyo Kabushiki Kaisha Steel cord for reinforcing a rubber structure
LU84435A1 (fr) * 1982-10-22 1984-05-10 Bekaert Sa Nv Cable compose pour remplacement d'elastomeres
LU84844A1 (de) * 1983-06-03 1983-11-17 Trefilarbed Sa Drahtseilkonstruktion fuer elastomere erzeugnisse
JPS62125085A (ja) * 1985-11-20 1987-06-06 東京製綱株式会社 タイヤコ−ド

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10487448B2 (en) 2014-05-08 2019-11-26 Nv Bekaert Sa Steel cord with reduced residual torsions

Also Published As

Publication number Publication date
ZA901611B (en) 1990-12-28
KR920701564A (ko) 1992-08-12
AU630940B2 (en) 1992-11-12
CA2050922A1 (en) 1990-10-04
AU5278890A (en) 1990-11-05
BR9007261A (pt) 1992-03-17
MX173016B (es) 1994-01-28
WO1990012145A1 (en) 1990-10-18
JPH04506235A (ja) 1992-10-29
DE69004795T2 (de) 1994-03-24
ES2049026T3 (es) 1994-04-01
EP0466720A1 (de) 1992-01-22
TR25281A (tr) 1993-01-01
DE69004795D1 (de) 1994-01-05

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