EP0586711B1 - Fil d'acier presentant une excellente aptitude au fa onnage en ressort, et production de ce fil - Google Patents

Fil d'acier presentant une excellente aptitude au fa onnage en ressort, et production de ce fil Download PDF

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Publication number
EP0586711B1
EP0586711B1 EP93906811A EP93906811A EP0586711B1 EP 0586711 B1 EP0586711 B1 EP 0586711B1 EP 93906811 A EP93906811 A EP 93906811A EP 93906811 A EP93906811 A EP 93906811A EP 0586711 B1 EP0586711 B1 EP 0586711B1
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Prior art keywords
steel wire
amino acid
acid compound
coating
wire
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EP93906811A
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German (de)
English (en)
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EP0586711A1 (fr
EP0586711A4 (en
Inventor
Teruyuki Itami Works Of Sumitomo Murai
Yoshiyuki Itami Works Of Sumitomo Miyamoto
Toshiya Itami Works Of Sumitomo Nakamura
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Sumitomo Electric Industries Ltd
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Sumitomo Electric Industries Ltd
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Priority claimed from JP06714192A external-priority patent/JP3178065B2/ja
Priority claimed from JP4111441A external-priority patent/JP3006279B2/ja
Priority claimed from JP20595692A external-priority patent/JPH0623459A/ja
Application filed by Sumitomo Electric Industries Ltd filed Critical Sumitomo Electric Industries Ltd
Publication of EP0586711A1 publication Critical patent/EP0586711A1/fr
Publication of EP0586711A4 publication Critical patent/EP0586711A4/en
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    • 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
    • B21F35/00—Making springs from wire
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
    • C10M105/56—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing nitrogen
    • C10M105/58—Amines, e.g. polyalkylene polyamines, quaternary amines
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
    • C10M105/56—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing nitrogen
    • C10M105/58—Amines, e.g. polyalkylene polyamines, quaternary amines
    • C10M105/60—Amines, e.g. polyalkylene polyamines, quaternary amines having amino groups bound to an acyclic or cycloaliphatic carbon atom
    • C10M105/62—Amines, e.g. polyalkylene polyamines, quaternary amines having amino groups bound to an acyclic or cycloaliphatic carbon atom containing hydroxy groups
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
    • C10M105/56—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing nitrogen
    • C10M105/68—Amides; Imides
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C26/00—Coating not provided for in groups C23C2/00 - C23C24/00
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
    • C10M2215/04—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/08—Amides
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/08—Amides
    • C10M2215/082—Amides containing hydroxyl groups; Alkoxylated derivatives
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/12—Partial amides of polycarboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/26—Amines
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/28—Amides; Imides
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/20—Metal working
    • C10N2040/24—Metal working without essential removal of material, e.g. forming, gorging, drawing, pressing, stamping, rolling or extruding; Punching metal
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/20—Metal working
    • C10N2040/241—Manufacturing joint-less pipes
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/20—Metal working
    • C10N2040/242—Hot working
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/20—Metal working
    • C10N2040/243—Cold working
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/20—Metal working
    • C10N2040/244—Metal working of specific metals
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/20—Metal working
    • C10N2040/244—Metal working of specific metals
    • C10N2040/245—Soft metals, e.g. aluminum
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/20—Metal working
    • C10N2040/244—Metal working of specific metals
    • C10N2040/246—Iron or steel
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/20—Metal working
    • C10N2040/244—Metal working of specific metals
    • C10N2040/247—Stainless steel

Definitions

  • the present invention relates to a steel wire which is excellent in the formability into springs and which is environmentally favorable and a method of manufacturing the same.
  • a drawn or hardened and tempered steel for spring was formed into e.g. coil springs as it is, it might seize to coiling pins of a coiling machine or stick slipping might occur between the wire and the pins. This is because of its high surface friction coefficient. The higher the strength of the steel wire or the higher the coiling speed, the more frequently such phenomena occur.
  • Such a fluororesin coating will not splash and can improve the spring formability.
  • this coating has one problem in that the resin decomposes and produces a gas containing fluorine when annealing the springs formed, which is an indispensable step to remove strains of the springs.
  • the gas thus produced may react with hydrogen contained in the atmospheric moisture, thus producing hydrogen fluoride gas (HF), which corrodes the springs and is also harmful to human beings. Further, the gas will leak out of the annealing facility and pollute the environment.
  • HF hydrogen fluoride gas
  • An object of this invention is to provide a steel wire which is free of the above problems and free from seizure and chattering during the forming, which is high in spring formability and thus can be formed into products having uniform shape and dimensions and which never produces any harmful gas during the annealing after the spring forming and to provide a method of manufacturing such a steel wire.
  • a coating of an amino acid compound is formed on the surface of a spring steel wire after drawing or hardening and tempering it, said amino acid compound containing a binder to increase the adhesion of the coating.
  • the amino acid compounds include amide-bonded compounds of amino acids and fatty acids and its metallic salts.
  • Amino acids are the molecules expressed by R-CH(NH 2 )COOH (wherein R is a hydrocarbon residue and include neutral amino acids such as glycine and alanine, acidic amino acids such as asparagic acid and glutamic acid, and basic amino acids such as lysine and hydroxylysine.
  • Fatty acids are the molecules expressed generally by R-COOH and include saturated fatty acids such as palmitic acid and stearic acid and unsaturated fatty acids such as linoleic acid.
  • amino acids and fatty acids are mere examples.
  • Amide-bonded compounds of amino acids and fatty acids are represented by the formula R1 CONH(R2)COOH (wherein R1 and R2 are hydrocarbon residues) and their metallic salts are expressed by the formula R1 CONH(R2)COOM (wherein M is a metal).
  • Such an amino acid compound should be coated to a steel wire preferably in the amount of between 3 g/m 2 and 15 g/m 2 . Further, in order to increase the adhesion to a steel wire, the coating contains binders such as an acrylic resin.
  • the steel wire according to the present invention can be manufactured by applying a solution formed by dispersing a powder of an amino acid compound in an organic solvent or water to a hardened and tempered spring steel wire and drying it naturally or forcibly.
  • the amino acid compound dispersed in the solution should have a particle size of between 0.5 and 30 ⁇ m.
  • a solution should contain binders for higher adhesion, irrespective of whether the liquid is an organic solvent or water. It may further contain antifoamers, rust preventives or antiseptics.
  • surface active agents should preferably be added to uniformly disperse the amino acid compound.
  • the solution contains a surface active agent, it is desirable to heat the steel wire until its surface temperature rises to between 100 °C and 200 °C after the solution applied to the wire has become dry.
  • the amino acid compound used will reveal a lubricity substantially as high as fluororesins.
  • the steel wire having a coating of an amino acid compound will never seize or chatter even if it is strongly rubbed against the coiling pins when it is formed into springs.
  • Such a coating should contain a binder because the binder increases the adhesion of the amino acid compound and thus makes the dried coating less likely to peel off even if a high forming pressure is applied thereto.
  • the spring formability thus improves still further.
  • the amino acid compound By uniformly dispersing the amino acid compound in an organic solvent or water, it can be applied uniformly to the steel wire and thus the coating will reveal its expected effects sufficiently.
  • the coating was formed by continuously applying a solution to the surface of the hardened and oil-tempered wire and drying it naturally before taking it up.
  • the solution used was prepared by uniformly dispersing in a low-boiling organic solvent (trichloroethane was used in this Example, containing a binder) 10 vol% of a powder of N-lauroyl-L-lysine, which is a compound of an amino acid and a fatty acid, the powder having a particle diameter of 0.5 - 30 ⁇ m.
  • the solution was applied to the wire so that the amino acid compound is present in the solution at the rate of 10 g/m 2 . After allowing the solvent to evaporate, the coated steel wire (Example 1 of the present invention) was wound into a coil.
  • Comparative Material 1 has a fluororesin coating provided on the surface of a hardened and tempered wire.
  • the coating was formed by applying a solution in the form of a fluorine solvent in which is uniformly dispersed 10 vol% of polytetrafluoroethylene (PTFE) powder having a particle diameter of 5 - 10 ⁇ m and drying it naturally.
  • PTFE polytetrafluoroethylene
  • Comparative Material 2 is a steel wire having an oil film formed on its surface by immersing it in a gear oil after hardening and tempering it and then coiling it.
  • the coil springs formed had the following dimensions:
  • the example according to the present invention showed a very small variation in free lengths comparable to that of the comparative example 1.
  • the coil springs made of the material wire according to the present invention and the coil springs made of the comparative material 1 were subjected to low-temperature annealing (heating temperature: 420 °C, heating time: 30 minutes) to remove strains and the amount of decomposition was measured for the amino acid compound coating (wire according to the present invention) and the fluororesin coating (comparative material 1). The results are shown in Fig. 1.
  • the amino acid compound coating according to the present invention decomposed by more than 80% in five minutes and decomposed 100% when ten minutes have passed.
  • the gas produced was composed of C, O, H and N, which are all harmless to human bodies.
  • the fluororesin coating of the comparative material 1 was slow to decompose. Only 50% decomposed in 15 minutes.
  • the gas produced was composed of C, H and F.
  • Fluorine (F) reacts with hydrogen in the atmosphere and produces hydrogen fluoride (HF), which is not only harmful to human bodies but can corrode the products.
  • Example 1 The same N-lauroyl-L-lysine coating as used for the specimen of the present invention in Example 1 was formed on the surface of a piano wire (SWP-A) having a diameter of 1.2 mm in the same manner as in Example 1 (Specimen 2 of the Invention). Also, we prepared Comparative Material 3 formed by applying the same polytetrafluoroethylene coating as used in Example 1 on the same piano wire as above and Comparative Material 4 formed by forming a gear oil film on the same piano wire as above.
  • SWP-A piano wire having a diameter of 1.2 mm
  • the coil springs formed had the following dimensions:
  • the coil springs formed from the material 2 of the present invention and the ones formed from Comparative Material 3 were subjected to low-temperature annealing under the same conditions as in Example 2 to remove strains. These coatings thermally decomposed in the same way as the coatings of Example 2.
  • a solution containing the same amino acid compound as used for the material of the present invention in Example 1 was applied to the same SWOSC-V wires as mentioned above in the amounts as shown in Table 4 and dried.
  • Specimen 5 showed a small variation in free lengths. But white powder splashed when coiling it and thus worsened the working environment. Further, slip on feed rolls was observed while coiling.
  • An amino acid compound coating was formed on the same SWOSC-V wire 4.0 mm in diameter as used in Example 1 by the second manufacturing method according to the present invention.
  • the solution used was water having uniformly dispersed therein 10 vol% of N-lauroyl-L-lysine powder having a particle diameter of 5 - 30 ⁇ m together with an acrylic resin binder and a surface active agent.
  • Specimen 4 was formed into 300 coil springs having the same dimensions as the springs formed in Example 1. Variation in free lengths of these springs was measured. The results of measurement are shown in Table 5. For comparison purposes, the data on Specimen 1 of the present invention and Comparative Materials 1 and 2 of Example 1 are also shown. Table 5 Item Mean value (mm) of free length Standard deviation Specimen 4 55.02 0.081 Specimen 1 55.03 0.080 Comparative material 1 55.03 0.072 Comparative material 2 55.04 0.182
  • Specimen 1 of the present invention After the measurement, this specimen was subjected to low-temperature annealing at 420 °C for 30 minutes. No harmful gas was produced as with Specimen 1 of the present invention in Example 1.
  • Specimens 1 and 3 of Examples 1 and 3 have disadvantages in that special care is needed in handling the amino acid compound power and that devices for collecting organic solvents have to be provided near the application and drying lines to collect organic solvents because it is not environmentally desirable to leave them uncollected.
  • Specimen 4 of the present invention in which aqueous solution is used, there is no need to exercise special care in handling the solution or to protect the environment.
  • aqueous solution was applied to steel wires after heating their surfaces to different temperatures and they were checked for how dried.
  • Steel wires used were the same wires as used in Examples 1 and 6, i.e. SWOSC-V wires having a diameter of 4 mm.
  • the aqueous solution used was the same one as used in Example 6, i.e. water having uniformly dispersed therein 10 vol% of N-lauroyl-L-lysine powder having a particle diameter of 5 - 30 ⁇ m together with an acrylic resin binder and a surface active agent.
  • the surface temperatures of the steel wires were kept at 50 ⁇ 5, 80 ⁇ 5, 110 ⁇ 5 °C, respectively.
  • the wire heated to 50 ⁇ 5 °C scarcely showed the effect of preheating and it had to be dried forcibly to shorten the processing time.
  • the solution dried naturally in several seconds after application and thus for in-line application the preheating was very effective.
  • the solution applied boiled and scattered on the surface of the steel wire, making uneven the amino acid compound on the wire surface in a speckled pattern.
  • the coating thus formed was unattractive to the eye. Also, due to this uneven coating, spring formability was not stable.
  • the aqueous solution was heated and applied to the wires. It was observed how the coating dried.
  • the same steel wires and aqueous solution as used in Example 7 were used.
  • the solution applied to the wires was heated to two different temperatures, i.e. 50 °C and 80 °C.
  • the solution heated to 50 °C scarcely showed the effect of preheating and it had to be dried forcibly when applied in the line.
  • the solution heated to 80 °C dried naturally in seconds and it was not necessary to dry it forcibly when applied in the line.
  • the solution could not be heated above 100 °C because it boiled at 100 °C.
  • Hardened and tempered steel wires SWOSC-V having a diameter of 4.0 mm were immersed in boiled water while moving them continuously to heat their surfaces to 80 ⁇ 5 °C. Then, the same solution as used in Example 6 was applied to the wire surfaces and dried to form a coating of lysine laurate ester containing an acrylic resin binder and a surface active agent.
  • One of the wires thus formed was wound into a coil shape as it is (wire 1 ). Another one was wound after heating it at 150 °C for one minute (wire 2). The other one was wound after heating it at 250 °C for one minute (wire 3).
  • the wires 1, 2 and 3 were subjected to an exposure test wherein they were exposed to an atmospheric environment kept at 20 °C with the humidity at 80% to check whether rust develops on the wires.
  • the wire 1 was the first to develop rust, followed by wired 3.
  • the wire 2 was the last to develop rust.
  • the wire heated to 150 °C had the highest corrosion resistance.
  • the wire 3 which was heated to 250 °C, no improvement in spring formability, which is the object of this invention, was observed, because the amount of the amino acid compound decreased due to thermal decomposition.
  • Fig. 2 shows how the amount of the amino acid compound decreases due to thermal decomposition.
  • the amino acid compound is stable at temperature of 200 °C or lower. At a temperature higher than 200 °C, its weight begins to decrease and at around 230 °C, decomposition rate increases sharply.
  • the spring steel wire has a coating of an amino acid compound.
  • This coating shows high surface lubricating properties comparable to a fluororesin coating and thus can effectively avoid seizure and chattering when forming springs.
  • an amino acid compound never produces any harmful gas that can corrode the products when they are subjected to low-temperature annealing to remove strain. According to the present invention, therefore, high-quality springs which are small in variations in shape and dimensions can be manufactured without polluting the environment.
  • the amino acid compound coating can be formed uniformly in the line.
  • the second method in which water is used as a solvent eliminates the necessity of providing any facility for collecting organic solvents and permits carefree handling of the solution. This method is especially favorable from the viewpoint of environmental protection.

Abstract

Fil d'acier pour ressorts présentant une excellente aptitude à un tel façonnage et non nocif pour l'environnement. Après étirage, trempe ou revenu, le fil subit un traitement de surface par un composé amino-acide qui améliore son aptitude à la lubrification et prévient les phénomènes de grippage et de broutage en cours de façonnage en ressort. Le composé amino-acide, bien que se décomposant thermiquement lors de l'étape de recuit de détente après façonnage du ressort, ne dégage aucun gaz nocif au cours de cette étape.

Claims (8)

  1. Fil d'acier présentant une excellente aptitude au façonnage en ressort, ayant un revêtement comprenant un composé aminoacide formé sur sa surface, dans lequel ledit revêtement est formé après traction ou durcissement et revenu du fil d'acier et ledit composé aminoacide formant ledit revêtement contient un liant pour augmenter l'adhérence dudit revêtement au fil d'acier.
  2. Fil d'acier selon la revendication 1, dans lequel ledit revêtement est prévu dans une quantité comprise entre 3 et 15 g/m3.
  3. Procédé de fabrication d'un fil d'acier présentant une excellente aptitude au façonnage en ressort, dans lequel ledit procédé comprend les étapes de durcir et revenir un fil d'acier élastique, appliquer à la surface du fil d'acier une solution comprenant un solvant aqueux ou organique et une poudre de composé aminoacide ayant un diamètre de particules de 0,5 µm à 30 µm et dispersée dans ledit solvant, et sécher celui-ci de manière naturelle ou forcée.
  4. Procédé de fabrication d'un fil d'acier selon la revendication 3, dans lequel ladite solution contient un liant pour augmenter l'adhérence du composé aminoacide au fil d'acier.
  5. Procédé de fabrication d'un fil d'acier selon la revendication 3 ou 4, dans lequel ladite solution est une solution aqueuse contenant un agent actif de surface pour améliorer l'uniformité de la dispersion du composé aminoacide dans l'eau.
  6. Procédé selon l'une quelconque des revendications 3 à 5, dans lequel, après chauffage dudit fil d'acier jusqu'à ce que sa température de surface atteigne entre 60°C et 100°C, ladite solution aqueuse est appliquée en continu à la surface du fil d'acier chauffé.
  7. Procédé selon l'une quelconque des revendications 3 à 5, dans lequel ladite solution aqueuse est appliquée en continu à la surface dudit fil d'acier après chauffage de ladite solution aqueuse à une température comprise entre 60°C et 100°C.
  8. Procédé selon l'une quelconque des revendications 3 à 7, dans lequel, après séchage dudit fil d'acier de manière naturelle ou forcée, ledit fil d'acier est chauffé jusqu'à ce que sa température de surface atteigne une température comprise entre 100°C et 200°C.
EP93906811A 1992-03-25 1993-03-22 Fil d'acier presentant une excellente aptitude au fa onnage en ressort, et production de ce fil Expired - Lifetime EP0586711B1 (fr)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
JP06714192A JP3178065B2 (ja) 1992-03-25 1992-03-25 ばね成形性に優れた鋼線
JP67141/92 1992-03-25
JP4111441A JP3006279B2 (ja) 1992-04-30 1992-04-30 ばね成形性に優れた鋼線の製造方法
JP111441/92 1992-04-30
JP20595692A JPH0623459A (ja) 1992-07-08 1992-07-08 ばね成形性に優れた鋼線の製造方法。
JP205956/92 1992-07-08
PCT/JP1993/000347 WO1993019225A1 (fr) 1992-03-25 1993-03-22 Fil d'acier presentant une excellente aptitude au façonnage en ressort, et production de ce fil

Publications (3)

Publication Number Publication Date
EP0586711A1 EP0586711A1 (fr) 1994-03-16
EP0586711A4 EP0586711A4 (en) 1994-08-17
EP0586711B1 true EP0586711B1 (fr) 1996-07-10

Family

ID=27299362

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93906811A Expired - Lifetime EP0586711B1 (fr) 1992-03-25 1993-03-22 Fil d'acier presentant une excellente aptitude au fa onnage en ressort, et production de ce fil

Country Status (3)

Country Link
EP (1) EP0586711B1 (fr)
DE (1) DE69303557T2 (fr)
WO (1) WO1993019225A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6706670B2 (en) 1996-08-30 2004-03-16 Solutia, Inc. Water soluble metal working fluids
JP6617922B2 (ja) * 2016-03-22 2019-12-11 住友電気工業株式会社 オイルテンパー線

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3372117A (en) * 1965-11-26 1968-03-05 Hooker Chemical Corp Cold forming lubricant
US3484209A (en) * 1966-12-08 1969-12-16 Burndy Corp Corrosion resistant electric contacts
GB1261358A (en) * 1967-11-22 1972-01-26 Nippon Kokan Kk Lubricant compositions for metal-forming processes and the method of coating metals therewith
JPS5474969A (en) * 1977-11-28 1979-06-15 Nippon Paint Co Ltd Metal coating lubricant
JPS58135719A (ja) * 1982-02-08 1983-08-12 Sumitomo Electric Ind Ltd ばね加工性のすぐれた鋼線
JPS58138513A (ja) * 1982-02-09 1983-08-17 Sumitomo Electric Ind Ltd ばね加工性のすぐれた鋼線の製造法
JPS62290529A (ja) * 1986-06-10 1987-12-17 日本精線株式会社 ＮｉＴｉ系合金材料
JP2683107B2 (ja) * 1989-06-22 1997-11-26 ブリヂストンメタルファ株式会社 鋼線およびその製造方法

Also Published As

Publication number Publication date
DE69303557D1 (de) 1996-08-14
DE69303557T2 (de) 1997-03-06
EP0586711A1 (fr) 1994-03-16
EP0586711A4 (en) 1994-08-17
WO1993019225A1 (fr) 1993-09-30

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