US3336784A - Method of drawing wire rope - Google Patents

Method of drawing wire rope Download PDF

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Publication number
US3336784A
US3336784A US411533A US41153364A US3336784A US 3336784 A US3336784 A US 3336784A US 411533 A US411533 A US 411533A US 41153364 A US41153364 A US 41153364A US 3336784 A US3336784 A US 3336784A
Authority
US
United States
Prior art keywords
strand
rope
wire
wire rope
stage
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
US411533A
Other languages
English (en)
Inventor
Campbell Robert Edward
Longbottom Kenneth William
Edward A Shipley
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.)
Bridon Ropes Ltd
Original Assignee
Bridon Ropes 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 GB1303764A external-priority patent/GB1012310A/en
Application filed by Bridon Ropes Ltd filed Critical Bridon Ropes Ltd
Priority claimed from DK43165A external-priority patent/DK127075B/da
Application granted granted Critical
Publication of US3336784A publication Critical patent/US3336784A/en
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
    • D07B5/00—Making ropes or cables from special materials or of particular form
    • D07B5/12—Making ropes or cables from special materials or of particular form of low twist or low tension by processes comprising setting or straightening treatments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C9/00—Cooling, heating or lubricating drawing material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F7/00—Twisting wire; Twisting wire together
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/525—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length for wire, for rods

Definitions

  • wire strand is meant three or more wires helically twisted together or about a centre wire.
  • wire rope By wire rope is meant two or more wire strands helically twisted together or around a centre core.
  • the invention consists in a method of treating a wire strand or Wire rope in which the strand or rope is drawn through a reducing means while applying uniform backtension thereto and subjecting the strand or rope on emerging from the reducing means and while still under tension to a heat treatment stage.
  • the heat treatment stage comprises a heating stage followed by a cooling stage.
  • the reducing stage deforms the cross-section of the strand or rope previously consisting of round wires in point contact with each other to a cross section comprising wires of intertting geometrical shapes in line surface contact with each other.
  • the degree of cooling achieved by the cooling unit should be such that the strand arrives at the capstan pulling the strand through the reducing means at such a temperature that the strand does not take a permanent set due to coiling around the capstan.
  • the relaxation from an initial load of of the breaking load may be less than 2% in one thousand hours while improvements are also shown in the stress relaxation properties at elevated temperatures.
  • the improvement in properties of the steel wire strand is of particular use in connection with the use of the strand for the pre-stressing of concrete.
  • the optimum drafting limits may be wire,'e.g. 4% to 80% reduction in cross sectional area in conjunction with back tension in the reduction stage in the range of 2% to 615% of the breaking load of the strand.
  • FIGURES la and lb joined at the dotdash line is a side elevation of an apparatus for carrying out the process of the invention.
  • a strand which may be say a 7 wire strand (6 Wires helically twisted round a centre wire) or a 19 wire strand (for example two successive layers of 9 wires each helically'twisted around a centre wire) is taken off from a pay ott reel 1 and is fed over compensating rollers 2 around a capstan Wheel 3a of a drag capstan 3.
  • the drag capstan pivots on a pivot 3b and the downward pressure is measured on a load cell 4 to give an indication of the back tension being applied.
  • the strand from the capstan wheel 3a passes through a post former 5 (which acts to straighten the strand) into a reduction die mounted in a die-holder 6 and then through an induction heater 7.
  • Coil 7 is fed by a high frequency generator, a typical unit being rated at 125 kva. using a frequency of 8 kc./sec. The length of the heating coil Varies with the speed of processing.
  • the strand passes a pyrometer 8 and then through a Water cooler 9 before going round the drawing-off capstan 10'.
  • a method of treating a wire strand or wire rope comprising the steps of drawing the strand or rope through a reducing means while applying a uniform back tension thereto and subjecting the strand or rope on emerging from the reducing means and while still under said back tension to a heat treatment stage.
  • a method as claimed in claim 1 in which the strand or rope comprising helically wound wires is drawn through the reducing means at a specified linear speed while applying back tension thereto to produce an initial rise in the temperature of the strand and subsequently further raising the temperature of the strand by a heat treatment stage of the order of 200 C.-400 C. while the strand is still under tension.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Ropes Or Cables (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
US411533A 1964-03-26 1964-11-16 Method of drawing wire rope Expired - Lifetime US3336784A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB1303764A GB1012310A (en) 1964-03-26 1964-03-26 Improvements in or relating to wire strand or rope
DK43165A DK127075B (da) 1964-03-26 1965-01-27 Fremgangsmåde til behandling af en ståldugt eller et ståltov.
DK111870AA DK138024B (da) 1964-03-26 1970-03-06 Fremgangsmåde til behandling af en ståldugt eller et ståltov.

Publications (1)

Publication Number Publication Date
US3336784A true US3336784A (en) 1967-08-22

Family

ID=27220670

Family Applications (1)

Application Number Title Priority Date Filing Date
US411533A Expired - Lifetime US3336784A (en) 1964-03-26 1964-11-16 Method of drawing wire rope

Country Status (8)

Country Link
US (1) US3336784A (fr)
BE (1) BE657137A (fr)
CH (1) CH443974A (fr)
DE (1) DE1510059B1 (fr)
DK (1) DK138024B (fr)
FI (1) FI40445B (fr)
LU (1) LU47240A1 (fr)
NL (2) NL6413030A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4036046A (en) * 1975-05-07 1977-07-19 Gkn Somerset Wire Limited Wire drawing

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1096866A (en) * 1913-04-16 1914-05-19 Gen Electric Process of drawing wire and apparatus for same.
US2057582A (en) * 1933-07-28 1936-10-13 Kennecott Wire And Cable Compa Continuous wire drawing and annealing
US3083817A (en) * 1953-11-18 1963-04-02 British Ropes Ltd Wire ropes
US3257792A (en) * 1961-02-10 1966-06-28 Bethlehem Steel Corp Wire sawing strand and method of making

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1330694A (fr) * 1962-08-14 1963-06-21 United States Steel Corp Procédé et appareil pour fabriquer des éléments métalliques toronnés

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1096866A (en) * 1913-04-16 1914-05-19 Gen Electric Process of drawing wire and apparatus for same.
US2057582A (en) * 1933-07-28 1936-10-13 Kennecott Wire And Cable Compa Continuous wire drawing and annealing
US3083817A (en) * 1953-11-18 1963-04-02 British Ropes Ltd Wire ropes
US3257792A (en) * 1961-02-10 1966-06-28 Bethlehem Steel Corp Wire sawing strand and method of making

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4036046A (en) * 1975-05-07 1977-07-19 Gkn Somerset Wire Limited Wire drawing

Also Published As

Publication number Publication date
CH443974A (de) 1967-09-15
FI40445B (fr) 1968-09-30
DK138024C (fr) 1978-11-13
NL134160C (fr)
DK138024B (da) 1978-06-26
NL6413030A (fr) 1965-09-27
DE1510059B1 (de) 1970-10-22
LU47240A1 (fr) 1964-12-29
BE657137A (fr) 1965-04-01

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