WO2010046201A1 - Pre-formed welded metal wire for hoses and method of pre-forming a metal wire - Google Patents

Pre-formed welded metal wire for hoses and method of pre-forming a metal wire Download PDF

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Publication number
WO2010046201A1
WO2010046201A1 PCT/EP2009/062544 EP2009062544W WO2010046201A1 WO 2010046201 A1 WO2010046201 A1 WO 2010046201A1 EP 2009062544 W EP2009062544 W EP 2009062544W WO 2010046201 A1 WO2010046201 A1 WO 2010046201A1
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WIPO (PCT)
Prior art keywords
metal wire
weld
wire
formation
welded
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Application number
PCT/EP2009/062544
Other languages
French (fr)
Inventor
Junwu Zhao
Donghui Hu
Original Assignee
Nv Bekaert Sa
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Publication of WO2010046201A1 publication Critical patent/WO2010046201A1/en

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Classifications

    • 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
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
    • B21C37/045—Manufacture of wire or bars with particular section or properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F1/00—Bending wire other than coiling; Straightening wire
    • B21F1/04—Undulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F15/00—Connecting wire to wire or other metallic material or objects; Connecting parts by means of wire
    • B21F15/02—Connecting wire to wire or other metallic material or objects; Connecting parts by means of wire wire with wire
    • B21F15/06—Connecting wire to wire or other metallic material or objects; Connecting parts by means of wire wire with wire with additional connecting elements or material
    • B21F15/08—Connecting wire to wire or other metallic material or objects; Connecting parts by means of wire wire with wire with additional connecting elements or material making use of soldering or welding

Definitions

  • the present invention relates to a metal wire with at least a weld, and the welded wire is pre-formed.
  • the present invention also relates to a reinforcement reinforced by at least a said metal wire.
  • the welded metal wire properties are not the same as the metal wire without weld. It leads to different strain hardening rate of metal wire.
  • a welded metal wire has a degree of ductility which is lower than the ductility of a non-welded metal wire. After cold drawing or cold rolling the elongation at break of welded metal wire is usually 60% of that of the metal wire without weld, while the breaking load of the welded metal wire is usually 70% of that of the metal wire without weld.
  • hose wires for the reinforcement of high pressure tube a number of reinforcement elements are used to withstand a total load. These elements often have a stress-strain response behavior.
  • the weld-containing elements may protrude out after the welds fracture and cause undesired results.
  • the stresses in the weld-free elements increase substantially due to less supporting elements and load increase. As a result, these weld-free elements may also fail and cause the total failure of the reinforced material.
  • Hose wire has a high requirement on elongation at break to reinforce hose. Every hose wire belt includes several metal wires, and the metal wire with weld is often failure earlier than other wire without weld in same belt. [0006] In general, we use more expensive material with high tension strength and high elongation at break to reinforce hose. The welded wire with low elongation at break cannot be adapted for hose. So the metal wires shorter than standard length are wasted. It causes high material and production cost and material wasted. Disclosure of Invention [0007] It is an object of the present invention to overcome the problem of high material and production cost and material wasted.
  • a metal wire has at least a weld.
  • the metal wire is pre-formed near or on the weld, and the elongation at break is improved.
  • the metal wire is pre-formed along the length of the wire within a distance of maximum 1 meter of the weld.
  • the metal wire can be pre-formed within a distance of 0.5, 0.3 or 0.1 meter of the weld. The pre-formation increases the ductility, e.g. the elongation, of the welded wire.
  • US 3319041 describes a plastic deformation in a direction perpendicular to the length of the strip with changing the cross-section considerably in order to facilitate butt welding.
  • the term 'pre-formed' refers to plastic deformation along the length of the wire leaving the cross-section mainly unchanged.
  • the metal wire is pre-formed before and after weld.
  • the metal wire is pre-formed before and after weld within a distance of maximum 1 meter of the weld.
  • the metal wire can be pre-formed before and after weld within a distance of 0.5, 0.3 or 0.1 meter of the weld.
  • the pre-formed section can include or exclude the weld point.
  • the welded metal wire is pre-formed into wavy.
  • the pre-formation is two-dimensional or three-dimensional. Additionally the welded metal wire can be pre-formed into kinks or springlike shapes.
  • the pre-formation rate is the rate of wave height and wave length (height/length).
  • the pre-formation rate ranges from 0.1 to 1.
  • Wave height is the height from wave crest or wave maximum to wave trough or wave minimum excluding two times the wave diameter.
  • the rate of wave height and wire diameter ranges from 40% to 600%.
  • Wave length is the length from one wave crest to the nearest wave crest.
  • the metal wire has at least a weld.
  • the pre-formation near or on each weld may be same or not.
  • Preferably the pre-formation near or on each weld is same. Different pre-formation rate can be applied on both sides of the weld.
  • the elongation at break of the welded metal wire is greatly improved after pre-formation.
  • the elongation at break of the metal wire with at least a weld is more than 80% of that of a metal wire without weld and without pre-formation.
  • the elongation at break of the metal wire with at least a weld is more than 90% of that of a metal wire without weld and without pre-formation.
  • the elongation at break of the metal wire with at least a weld is more than 100% of that of a metal wire without weld and without pre-formation.
  • the cross section of the metal wire can be circular or non-circular.
  • the metal wire can be a steel wire or an alloy steel wire.
  • the alloy steel wire should be medium or high carbon steel wire.
  • the alloy steel wire comprises a minimum carbon content of 0.40%.
  • Preferably the alloy steel wire is high carbon low alloy steel wire for its carbon content is more than 0.70%.
  • the alloy wire can also contain: manganese (content ranging from 0.10 % to 1.10 %), sulphur and phosphorus (contents being limited to 0.15 %), and/or silicon (content ranging from 0.10 % to 0.90 %). Additionally chromium, nickel, molybdenum, niobium, copper, calcium, aluminum, titanium and/or nitrogen may be added.
  • the metal wire may be provided with a corrosion resistant coating or with a coating that promotes the adhesion with rubber.
  • a corrosion resistant coating may be zinc or a zinc alloy such as zinc aluminum or zinc aluminum magnesium. Additionally a primer such as silane may be used.
  • a coating that promotes the adhesion with rubber may be brass (i.e. a zinc copper alloy with either low - 63.5 wt % Cu - or high copper - 67.5 wt %
  • a method of pre-formation is provided.
  • a crimper device is used to pre-form the straight welded metal wire.
  • the metal wire is pre-formed into wavy.
  • Wave length is defined by the design of the crimper device (see wheel 12 shown in FIGURE 1).
  • Wave height is defined by the indentation of the crimper device.
  • Special pre-formation rate is applied on metal wire to adapt to special reinforcement.
  • Preferably the welded metal wire is pre-formed after cool drawing or cold rolling.
  • the elongation at break of the welded metal wire after pre-formation is more than 80% of that of the metal wire without weld and without preformation.
  • the broken metal wire can be welded and pre-formed to get high elongation at break.
  • the metal wire with at least a weld can be adapted for reinforcement.
  • a composite product is reinforced by a group of metal wires containing at least one metal wire with weld.
  • the composite product is a hose.
  • the elongation at break of the hose reinforced by at least one that said metal wire is close to that of the hose without welded metal wire.
  • the metal wire with pre-formation does not influence the winding quality.
  • the performance of the reinforcement is improved for the improving of the elongation at break of welded metal wire.
  • FIGURE 1 shows how the crimp device is provided to pre-form the metal wire into two-dimension wavy form
  • FIGURE 2 shows how the crimp devices are provided to pre-form the metal wire into three-dimension wavy form
  • FIGURE 3 shows metal wire as one subject of the invention
  • FIGURE 4 shows the wave height and the wave length
  • FIGURE 5 shows metal wire as another subject of the invention
  • FIGURE 6 shows stress-strain curves of the metal wire without weld and without pre-formation, welded metal wire without pre-formation and welded metal wire with pre-formation
  • FIGURE 7 shows stress-strain curves of a group of metal wires without weld and without pre-formation, a group of metal wires comprising one welded metal wire without pre-formation, and a group of metal wires comprising one welded metal wire with pre-formation;
  • FIGURE 8 shows a metal wire as subject of the invention adapted to reinforce a rubber hose.
  • FIGURE 1 illustrates how the crimper device is provided to pre-form the metal wire into two-dimension wavy form.
  • the steel wire 10 containing welded point 16 is moved downstream towards a pair of toothed wheels 12.
  • the pre-formation on the welded metal wire is two-dimensional.
  • FIGURE 2 illustrates how the crimper devices are provided to pre-form the metal wire into three-dimension wavy form.
  • the steel wire 10 containing welded point 16 is moved downstream towards a first pair of toothed wheels 12.
  • the axes of rotation of toothed wheels 12 lie parallel to the y- axis, and the first crimper given is a planar crimper lying in plane xz.
  • the crimped wire 10 is further moved to a second pair of toothed wheels 14.
  • the axes of rotation of toothed wheels 14 lie parallel to the x-axis, and the second crimper given is a planar crimper lying in plane yz.
  • the preformation on the welded metal wire is three-dimensional. In order to avoid that the first given crimps collapse when the second crimp is being given, the wire 10 may take a bend between the two sets of toothed wheels 12 and 14.
  • FIGURE 3 A first preferred embodiment is shown in FIGURE 3.
  • the straight steel wire 10 with a diameter of 0.25 mm is pre-formed symmetrically before and after weld 16 into two-dimension wavy form.
  • the pre-formation section 18 includes the welded point 16.
  • FIGURE 4 shows the wave height and the wave length.
  • the wave height 42 is 0.65 mm.
  • the wave length 40 is 1.3 mm.
  • the total pre-formation distance is 1 m in the axial direction.
  • the elongation at break of the first preferred embodiment is 110.2% of that of the steel wire without weld and without pre-formation.
  • FIGURE 5 A second preferred embodiment is shown in FIGURE 5.
  • the straight steel wire 10 with a diameter of 0.25 mm is pre-formed symmetrically near weld 16 into two-dimension wavy form.
  • the wave height is 0.70 mm.
  • the wave length is 1.5 mm.
  • the total pre-formation distance is 0.8 m in the axial direction.
  • the elongation at break of the second preferred embodiment is 104.1 % of that of the steel wire without weld and without pre-formation.
  • Figure 6 shows stress-strain curves of the metal wire without weld and without pre-formation, welded metal wire without pre-formation and welded metal wire with pre-formation.
  • Curve 2 shows the stress-strain curve of a steel wire without weld and without pre-formation.
  • Curve 6 shows the stress-strain curve of the first preferred embodiment.
  • Curve 4 shows the stress-strain curve of the second preferred embodiment.
  • Curve 8 shows the stress-strain curve of the welded steel wire without pre-formation.
  • the elongation at break of the first preferred embodiment is 110.2% of that of the steel wire without weld and without pre-formation
  • the elongation at break of the second preferred embodiment is 104.1 % of that of the steel wire without weld and without pre-formation
  • the elongation at break of the welded steel wire without pre-formation is 62.5% of that of the steel wire without weld and without pre-formation. It is clear that the elongation at break of the welded metal wire is greatly improved after pre-formation.
  • a comparison test shows that different pre-formation rate can obtain different elongation at break.
  • the straight steel wire with a diameter of 0.30 mm is pre-formed symmetrically before and after weld in two- dimension by crimper device.
  • the pre-formation section includes the weld point.
  • the total pre-formation distance is 0.6 m in the axial direction. Different pre-formation rates are used.
  • FIGURE 7 shows stress-strain curves of a group of metal wires without weld and without pre-formation, a group of metal wires comprising one welded metal wire without pre-formation, and a group of metal wires comprising one welded metal wire with pre-formation.
  • Curve 30 shows the stress and strain curve of a group of steel wires without weld and without pre-formation.
  • Curve 32 shows the stress and strain curve of a group of steel wires comprising one welded steel wire with pre-formation.
  • Curve 34 shows the stress and strain curve of a group of steel wires comprising one welded steel wire without pre-formation.
  • FIGURE 8 illustrates a pre-formed welded steel wire 10 is used to reinforce hose.
  • Such said hose comprises two layers of steel wire braids, the synthetic rubber tube and synthetic rubber cover.
  • the steel wire braid comprises a number of strands. Each strand comprises 7 steel wires containing the pre-formed welded steel wire 10, and the steel wires are arranged regularly.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ropes Or Cables (AREA)

Abstract

A metal wire (10) adapted as reinforcement element for hoses has at least a weld (16). The metal wire is pre-formed (24) within a distance of maximum 1 meter of the weld in order to increase ductility and to compensate for the weld.

Description

Title of the Invention
PRE-FORMED WELDED METAL WIRE FOR HOSES AND METHOD OF PRE-FORMING A METAL WIRE
Description
Technical Field
[0001] The present invention relates to a metal wire with at least a weld, and the welded wire is pre-formed.
[0002] The present invention also relates to a reinforcement reinforced by at least a said metal wire.
Background Art
[0003] The welded metal wire properties are not the same as the metal wire without weld. It leads to different strain hardening rate of metal wire. A welded metal wire has a degree of ductility which is lower than the ductility of a non-welded metal wire. After cold drawing or cold rolling the elongation at break of welded metal wire is usually 60% of that of the metal wire without weld, while the breaking load of the welded metal wire is usually 70% of that of the metal wire without weld.
[0004] In material reinforcement, for example hose wires for the reinforcement of high pressure tube, a number of reinforcement elements are used to withstand a total load. These elements often have a stress-strain response behavior. When one or part metal wires in a group of metal wires include welded section, the total elongation at break of this group of metal wires will become lower. The weld-containing elements may protrude out after the welds fracture and cause undesired results. Furthermore, after the weld fracture, the stresses in the weld-free elements increase substantially due to less supporting elements and load increase. As a result, these weld-free elements may also fail and cause the total failure of the reinforced material.
[0005] Hose wire has a high requirement on elongation at break to reinforce hose. Every hose wire belt includes several metal wires, and the metal wire with weld is often failure earlier than other wire without weld in same belt. [0006] In general, we use more expensive material with high tension strength and high elongation at break to reinforce hose. The welded wire with low elongation at break cannot be adapted for hose. So the metal wires shorter than standard length are wasted. It causes high material and production cost and material wasted. Disclosure of Invention [0007] It is an object of the present invention to overcome the problem of high material and production cost and material wasted.
[0008] It is another object of the present invention to use welded metal wires in composite products such as hoses.
[0009] It is a further object of the present invention to provide reinforcement comprised at least one metal wire.
[0010] According to the present invention, a metal wire has at least a weld. The metal wire is pre-formed near or on the weld, and the elongation at break is improved. Preferably the metal wire is pre-formed along the length of the wire within a distance of maximum 1 meter of the weld. The metal wire can be pre-formed within a distance of 0.5, 0.3 or 0.1 meter of the weld. The pre-formation increases the ductility, e.g. the elongation, of the welded wire.
[0011] US 3319041 describes a plastic deformation in a direction perpendicular to the length of the strip with changing the cross-section considerably in order to facilitate butt welding.
[0012] According to the invention, the term 'pre-formed' refers to plastic deformation along the length of the wire leaving the cross-section mainly unchanged. [0013] Preferably the metal wire is pre-formed before and after weld. The metal wire is pre-formed before and after weld within a distance of maximum 1 meter of the weld. The metal wire can be pre-formed before and after weld within a distance of 0.5, 0.3 or 0.1 meter of the weld.
[0014] The pre-formed section can include or exclude the weld point.
[0015] According to the present invention, the welded metal wire is pre-formed into wavy. The pre-formation is two-dimensional or three-dimensional. Additionally the welded metal wire can be pre-formed into kinks or springlike shapes.
[0016] Different pre-formation rate can obtain different elongation at break. So special pre-formation rate is applied on metal wire to adapt to special reinforcement. With the increase of pre-formation rate, the elongation at break of the metal wire increases. The pre-formation rate is the rate of wave height and wave length (height/length). Preferably the pre-formation rate ranges from 0.1 to 1. Wave height is the height from wave crest or wave maximum to wave trough or wave minimum excluding two times the wave diameter. To the different diametric metal wire, different wave height is used. Preferably the rate of wave height and wire diameter (wave height/wire diameter) ranges from 40% to 600%. Wave length is the length from one wave crest to the nearest wave crest.
[0017] According to the present invention, the metal wire has at least a weld. The pre-formation near or on each weld may be same or not. Preferably the pre-formation near or on each weld is same. Different pre-formation rate can be applied on both sides of the weld.
[0018] The elongation at break of the welded metal wire is greatly improved after pre-formation. The elongation at break of the metal wire with at least a weld is more than 80% of that of a metal wire without weld and without pre-formation. Preferably the elongation at break of the metal wire with at least a weld is more than 90% of that of a metal wire without weld and without pre-formation. Most preferably the elongation at break of the metal wire with at least a weld is more than 100% of that of a metal wire without weld and without pre-formation.
[0019] By exercising a small load on the pre-formed wire, the pre-formation will stretch out and lead to a structural elongation.
[0020] The cross section of the metal wire can be circular or non-circular.
[0021] The metal wire can be a steel wire or an alloy steel wire. The alloy steel wire should be medium or high carbon steel wire. The alloy steel wire comprises a minimum carbon content of 0.40%. Preferably the alloy steel wire is high carbon low alloy steel wire for its carbon content is more than 0.70%. The alloy wire can also contain: manganese (content ranging from 0.10 % to 1.10 %), sulphur and phosphorus (contents being limited to 0.15 %), and/or silicon (content ranging from 0.10 % to 0.90 %). Additionally chromium, nickel, molybdenum, niobium, copper, calcium, aluminum, titanium and/or nitrogen may be added.
[0022] The metal wire may be provided with a corrosion resistant coating or with a coating that promotes the adhesion with rubber. [0023] A corrosion resistant coating may be zinc or a zinc alloy such as zinc aluminum or zinc aluminum magnesium. Additionally a primer such as silane may be used. [0024] A coating that promotes the adhesion with rubber may be brass (i.e. a zinc copper alloy with either low - 63.5 wt % Cu - or high copper - 67.5 wt %
Cu) or a ternary zinc - copper - nickel or zinc - copper - cobalt alloy.
[0025] According to the present invention, a method of pre-formation is provided. A crimper device is used to pre-form the straight welded metal wire. The metal wire is pre-formed into wavy. Wave length is defined by the design of the crimper device (see wheel 12 shown in FIGURE 1). Wave height is defined by the indentation of the crimper device. Special pre-formation rate is applied on metal wire to adapt to special reinforcement. [0026] Preferably the welded metal wire is pre-formed after cool drawing or cold rolling.
[0027] The elongation at break of the welded metal wire after pre-formation is more than 80% of that of the metal wire without weld and without preformation.
[0028] So the broken metal wire can be welded and pre-formed to get high elongation at break. The metal wire with at least a weld can be adapted for reinforcement.
[0029] According to the present invention, a composite product is reinforced by a group of metal wires containing at least one metal wire with weld. Preferably the composite product is a hose. The elongation at break of the hose reinforced by at least one that said metal wire is close to that of the hose without welded metal wire. And the metal wire with pre-formation does not influence the winding quality. The performance of the reinforcement is improved for the improving of the elongation at break of welded metal wire.
Brief Description of Drawings
[0030] The invention will now be described into more detail with reference to the accompanying drawings wherein [0031] FIGURE 1 shows how the crimp device is provided to pre-form the metal wire into two-dimension wavy form; [0032] FIGURE 2 shows how the crimp devices are provided to pre-form the metal wire into three-dimension wavy form;
[0033] FIGURE 3 shows metal wire as one subject of the invention; [0034] FIGURE 4 shows the wave height and the wave length; [0035] FIGURE 5 shows metal wire as another subject of the invention; [0036] FIGURE 6 shows stress-strain curves of the metal wire without weld and without pre-formation, welded metal wire without pre-formation and welded metal wire with pre-formation; [0037] FIGURE 7 shows stress-strain curves of a group of metal wires without weld and without pre-formation, a group of metal wires comprising one welded metal wire without pre-formation, and a group of metal wires comprising one welded metal wire with pre-formation;
[0038] FIGURE 8 shows a metal wire as subject of the invention adapted to reinforce a rubber hose.
Mode(s) for Carrying Out the Invention
[0039] FIGURE 1 illustrates how the crimper device is provided to pre-form the metal wire into two-dimension wavy form. The steel wire 10 containing welded point 16 is moved downstream towards a pair of toothed wheels 12. The pre-formation on the welded metal wire is two-dimensional.
[0040] FIGURE 2 illustrates how the crimper devices are provided to pre-form the metal wire into three-dimension wavy form. The steel wire 10 containing welded point 16 is moved downstream towards a first pair of toothed wheels 12. The axes of rotation of toothed wheels 12 lie parallel to the y- axis, and the first crimper given is a planar crimper lying in plane xz. The crimped wire 10 is further moved to a second pair of toothed wheels 14. The axes of rotation of toothed wheels 14 lie parallel to the x-axis, and the second crimper given is a planar crimper lying in plane yz. The preformation on the welded metal wire is three-dimensional. In order to avoid that the first given crimps collapse when the second crimp is being given, the wire 10 may take a bend between the two sets of toothed wheels 12 and 14.
[0041] A first preferred embodiment is shown in FIGURE 3. The straight steel wire 10 with a diameter of 0.25 mm is pre-formed symmetrically before and after weld 16 into two-dimension wavy form. The pre-formation section 18 includes the welded point 16. FIGURE 4 shows the wave height and the wave length. The wave height 42 is 0.65 mm. The wave length 40 is 1.3 mm. The total pre-formation distance is 1 m in the axial direction. The elongation at break of the first preferred embodiment is 110.2% of that of the steel wire without weld and without pre-formation.
[0042] A second preferred embodiment is shown in FIGURE 5. The straight steel wire 10 with a diameter of 0.25 mm is pre-formed symmetrically near weld 16 into two-dimension wavy form. There are two pre-formation sections 24 excluding the welded point 16. And the distance between the preformation sections 24 is 0.7 m. The wave height is 0.70 mm. The wave length is 1.5 mm. The total pre-formation distance is 0.8 m in the axial direction. The elongation at break of the second preferred embodiment is 104.1 % of that of the steel wire without weld and without pre-formation.
[0043] Figure 6 shows stress-strain curves of the metal wire without weld and without pre-formation, welded metal wire without pre-formation and welded metal wire with pre-formation. Curve 2 shows the stress-strain curve of a steel wire without weld and without pre-formation. Curve 6 shows the stress-strain curve of the first preferred embodiment. Curve 4 shows the stress-strain curve of the second preferred embodiment. Curve 8 shows the stress-strain curve of the welded steel wire without pre-formation. The elongation at break of the first preferred embodiment is 110.2% of that of the steel wire without weld and without pre-formation, and the elongation at break of the second preferred embodiment is 104.1 % of that of the steel wire without weld and without pre-formation, while the elongation at break of the welded steel wire without pre-formation is 62.5% of that of the steel wire without weld and without pre-formation. It is clear that the elongation at break of the welded metal wire is greatly improved after pre-formation.
[0044] A comparison test shows that different pre-formation rate can obtain different elongation at break. The straight steel wire with a diameter of 0.30 mm is pre-formed symmetrically before and after weld in two- dimension by crimper device. The pre-formation section includes the weld point. The total pre-formation distance is 0.6 m in the axial direction. Different pre-formation rates are used.
[0045] (a) pre-formation rate=0.1 (wave height=0.10 mm, wave length=1.0 mm) [0046] (b) pre-formation rate =0.3 (wave height=0.45 mm, wave length=1.5 mm)
[0047] (c) pre-formation rate=0.5(wave height=0.75 mm, wave length=1.5 mm)
[0048] (d) pre-formation rate=0.8(wave height=0.8 mm, wave length=1.0 mm)
[0049] (e) pre-formation rate=1 (wave height=1.50mm, wave length=1.50 mm)
[0050] The elongation at break and the breaking load are measured. The table hereunder summarizes the results.
[0051] TABLE
Figure imgf000009_0001
[0052] It is shown that with the increasing of the pre-formation rate, the elongation at break increases and the breaking load decreases. So it is clear that special pre-formation rate is applied on metal wire to adapt to special reinforcement.
[0053] FIGURE 7 shows stress-strain curves of a group of metal wires without weld and without pre-formation, a group of metal wires comprising one welded metal wire without pre-formation, and a group of metal wires comprising one welded metal wire with pre-formation. Curve 30 shows the stress and strain curve of a group of steel wires without weld and without pre-formation. Curve 32 shows the stress and strain curve of a group of steel wires comprising one welded steel wire with pre-formation. Curve 34 shows the stress and strain curve of a group of steel wires comprising one welded steel wire without pre-formation. It is clear that a group of welded wires comprising one welded metal wire with pre-formation has the similar performance in stress and strain with a group of metal wires without weld and without pre-formation. The welded wire with pre-formation does not influence the performance of the reinforcement. The welded wire with preformation can be used to reinforce the reinforcement. FIGURE 8 illustrates a pre-formed welded steel wire 10 is used to reinforce hose. Such said hose comprises two layers of steel wire braids, the synthetic rubber tube and synthetic rubber cover. The steel wire braid comprises a number of strands. Each strand comprises 7 steel wires containing the pre-formed welded steel wire 10, and the steel wires are arranged regularly.

Claims

Claims
Claim 1. A metal wire to be a reinforcement element, said metal wire has at least a weld, characterized in that said metal wire is pre-formed within a distance of maximum 1 meter of the weld.
Claim 2. A metal wire as claimed in claim 1 , characterized in that said metal wire is pre-formed before and after weld.
Claim 3. A metal wire as claimed in claim 1 or 2, characterized in that said pre-formed section includes the weld point.
Claim 4. A metal wire as claimed in claim 1 or 2, characterized in that said preformed section excludes the weld point.
Claim 5. A metal wire as claimed in any one of claim 1 to 4, characterized in that said metal wire is pre-formed into wavy.
Claim 6. A metal wire as claimed in claim 5, characterized in that said preformation is two-dimensional.
Claim 7. A metal wire as claimed in claim 1 to 5, characterized in that said pre-formation is three-dimensional.
Claim 8. A metal wire as claimed in any one of claim 1 to 8, characterized in that the elongation at break of that said metal wire with at least a weld is more than 80% of that of a metal wire without weld.
Claim 9. A metal wire as claimed in claim 9, characterized in that the elongation at break of that said metal wire with at least a weld is more than
100% of that of a metal wire without weld.
Claim 10. A metal wire as claimed in any one of claim 1 to 9, characterized in that said metal wire is a steel wire.
Claim 11. A metal wire as claimed in any one of claim 1 to 9, characterized in that said metal wire is an alloy steel wire.
Claim 12. A method of pre-forming a metal wire, said method is: Pre-form straight welded metal wire by crimper device.
Claim 13. A composite product reinforced by a group of metal wires, being characterized in that at least one metal wire is as claimed in claim 1 to 11.
Claim 14. A composite product as claimed in claim 13, characterized in that said composite product is a hose.
PCT/EP2009/062544 2008-10-24 2009-09-28 Pre-formed welded metal wire for hoses and method of pre-forming a metal wire WO2010046201A1 (en)

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Application Number Priority Date Filing Date Title
EP08167543 2008-10-24
EP08167543.1 2008-10-24

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103495683A (en) * 2013-09-18 2014-01-08 高亢 Deformation gear used for manufacturing deformation metal wires

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2763057A (en) * 1954-07-12 1956-09-18 Koldweld Corp Cold pressure welding of metal foil
US3319041A (en) * 1963-07-18 1967-05-09 Cf & I Steel Corp Electric butt welding of thin flat wire
WO2004002644A1 (en) * 2002-06-28 2004-01-08 Weatherford Canada Partnership Method of manufacturing continuous sucker rod
US20070157443A1 (en) * 2003-05-02 2007-07-12 Baldwin Gardner T Method of attachment for a high pressure reinforced rubber hose coupling

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2763057A (en) * 1954-07-12 1956-09-18 Koldweld Corp Cold pressure welding of metal foil
US3319041A (en) * 1963-07-18 1967-05-09 Cf & I Steel Corp Electric butt welding of thin flat wire
WO2004002644A1 (en) * 2002-06-28 2004-01-08 Weatherford Canada Partnership Method of manufacturing continuous sucker rod
US20070157443A1 (en) * 2003-05-02 2007-07-12 Baldwin Gardner T Method of attachment for a high pressure reinforced rubber hose coupling

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103495683A (en) * 2013-09-18 2014-01-08 高亢 Deformation gear used for manufacturing deformation metal wires

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