EP0743352B1 - Composition lubrifiante convenant à l'application sur des pièces métalliques pour le formage à chaud - Google Patents

Composition lubrifiante convenant à l'application sur des pièces métalliques pour le formage à chaud Download PDF

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Publication number
EP0743352B1
EP0743352B1 EP96107611A EP96107611A EP0743352B1 EP 0743352 B1 EP0743352 B1 EP 0743352B1 EP 96107611 A EP96107611 A EP 96107611A EP 96107611 A EP96107611 A EP 96107611A EP 0743352 B1 EP0743352 B1 EP 0743352B1
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EP
European Patent Office
Prior art keywords
lubricant composition
water
composition according
weight
sodium
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
EP96107611A
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German (de)
English (en)
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EP0743352A1 (fr
Inventor
Jacques Dr. Periard
Hans-Rudolf Staub
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.)
Imerys Graphite and Carbon Switzerland SA
Original Assignee
Imerys Graphite and Carbon Switzerland SA
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Application filed by Imerys Graphite and Carbon Switzerland SA filed Critical Imerys Graphite and Carbon Switzerland SA
Priority to SI9630075T priority Critical patent/SI0743352T1/xx
Publication of EP0743352A1 publication Critical patent/EP0743352A1/fr
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    • 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
    • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
    • C10M169/04—Mixtures of base-materials and additives
    • C10M169/044—Mixtures of base-materials and additives the additives being a mixture of non-macromolecular and macromolecular compounds
    • C—CHEMISTRY; METALLURGY
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    • C10M139/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing atoms of elements not provided for in groups C10M127/00 - C10M137/00
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    • C10M103/00—Lubricating compositions characterised by the base-material being an inorganic material
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    • C10M145/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
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    • 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 invention relates to a new lubricant composition for use on workpieces in the hot forming of metals, in particular for use in the hot rolling of blocks and profiles or in the production of hollow blocks in so-called shaping bench systems. Due to the fact that the metals to be processed have a surface temperature of approx. 800 ° C to 1300 ° C, the focus in practice has so far been on the lubrication of the tools, which are more accessible to classic lubrication at temperatures of maximum 400 ° C are. Although it is disclosed in the prior art, for example in CH-PS 660 023, that workpieces with temperatures above 600 ° C.
  • JP-A-5 516 897 discloses a high temperature lubricant for the hot forming of metals made from glass powder with a low melting point, graphite powder and alkali silicate as a binder.
  • High temperature lubricant forms a lubricant film consisting of graphite dispersed in molten glass powder.
  • the lubrication of the tools also has various difficulties afflicted. So is the application of the lubricant solely because of the geometry of the Tools often difficult or low tool temperatures around 100 ° C do not allow correct formation of a lubricant film. Because the tools are always with large amounts of cooling water are treated, are also large losses of lubricant the rule of what a waste water contamination and a appropriate treatment of the waste water entails. For good lubrication therefore relatively large amounts of lubricant required.
  • a normal glass with an average grain diameter d 50 of ⁇ 100 ⁇ m and a softening range of approx. 700 ° C to 900 ° C is suitably used as the glass powder (CAS No. 65997-17-3).
  • the glass powder is largely responsible for the excellent film properties of the lubricant. Due to its relatively high softening point, it is used in increasing quantities when the surface temperature of the workpiece exceeds the 1000 ° C limit.
  • the glass frit is mainly used when the application temperatures are in the lower range from approx. 800 ° C. Then, due to the lower softening range of approx. 500 ° C to 700 ° C compared to glass powder, the film-forming properties of the glass frit come into full effect.
  • the chemical frit of the glass frit is expediently an alkali-alkaline earth-alumo-boron silicate and is usually used in an average grain size d 50 of ⁇ 100 ⁇ m.
  • glass powder and glass frit are available in any of the specified limits Mixing ratios can be used.
  • graphite Another important component is graphite. Both synthetic graphite and natural graphite can be used.
  • the average grain size d 50 of the graphite used is expediently less than 100 ⁇ m.
  • the water-soluble alkali silicates play an essential role as binders.
  • a mixture of the preferred alkali silicates mentioned in a ratio of sodium silicate: potassium silicate: lithium silicate of 12.3%: 67.5%: 20.7% is particularly preferably used.
  • a water-soluble sodium metapolyphosphate acts as a lubricant component that suppresses foaming.
  • This is expediently understood to mean a compound having the general formula (NaPO 3 ) n where n is less than 450. These compounds are also known under the name "hexametaphosphate” or "Graham's salt”.
  • a water-insoluble sodium metapolyphosphate as a binder.
  • Particularly suitable for this purpose are the compounds of the general formula (NaPO 3 ) n known under the name "Maddrell's salt", in which n is 40 to 70.
  • a thickener expediently a polysaccharide or a polysaccharide derivative is critical to ensuring constant viscosity and Stability of the lubricant dispersion over a wide temperature range, as well as for the Prevention of sedimentation of the solids in the dispersion.
  • a thickener expediently a polysaccharide or a polysaccharide derivative is critical to ensuring constant viscosity and Stability of the lubricant dispersion over a wide temperature range, as well as for the Prevention of sedimentation of the solids in the dispersion.
  • Biopolysaccharides like xanthan gum, rhamsan gum or an alkyl cellulose like that Hydroxymethyl cellulose, application.
  • alkali salts of the Add polyacrylic acid especially sodium polyacrylates.
  • the lubricant composition expediently added a commercially available biocide.
  • borax sodium tetraborate decahydrate
  • the lubricant according to the invention is expediently used in the form of an aqueous dispersion with a solids content of preferably 20% to 50%. It is quite possible to vary the limits up and down.
  • the dispersion can be produced in commercially available dispersing devices which enable high shear forces (cf., for example, EP-PS 218 989).
  • the ready-to-use dispersion expediently has a viscosity in the range from 1000 MPas to 7000 MPas (Rheomat 15, 20 ° C., cell B, speed 5), but can be varied further by adding thickeners.
  • the application of the lubricant dispersion can be done via known systems for spraying disperse systems (see e.g. EP-A 453 801).
  • the lubricant composition disclosed above for Use on workpieces with surface temperatures from 800 ° C to 1300 ° C in the hot forming of metals, especially in the hot rolling of blocks and Profiles or used in the manufacture of hollow blocks in so-called push bench systems.
  • the dispersion is applied to the workpiece immediately before the forming. Descaling the workpiece beforehand is an advantage but not essential. After the immediate evaporation of the water, a uniform, water-insoluble lubricating film on the workpiece surface from the subsequent forming process is not affected.
  • Formulation 1 (suitable for workpieces with surface temperatures of 850 ° C - 1200 ° C).
  • Formulation 2 (suitable for workpieces with surface temperatures of 1000 ° C - 1250 ° C)
  • Formulation 3 (suitable for workpieces with surface temperatures of 1000 ° C - 1250 ° C)
  • Formulation 4 (suitable for workpieces with surface temperatures of 850 ° C - 1250 ° C)
  • Comparative formulation 1 (according to CH-PS 660 023, example 1)
  • Comparative formulation 2 (according to CH-PS 670 106, example 2)
  • Formulation Test result (class) 1 3 (from 850 ° C) 2nd 3 (from 1000 ° C) 3rd 3 (from 1000 ° C) 4th 3 (from 850 ° C) Comparison 1 1 Comparison 2 2nd

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Lubricants (AREA)
  • Extrusion Of Metal (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)

Claims (12)

  1. Composition lubrifiante pour l'application sur des pièces d'usinage lors de la formation à froid de métaux constitués par
    a1) 0-80 % en poids d'une poudre de verre
    a2) 0-50 % en poids d'un frittage de verre
    la quantité d'au moins l'un des composants a1) ou a2) dans la composition lubrifiante n'étant pas égale à 0 % en poids
    b) 10-25% en poids de graphite naturel ou synthétique
    c) 20% en poids d'un ou de plusieurs silicates alcalin de la formule générale Me2O n SiO2, dans laquelle Me le lithium, le potassium, ou le sodium et n est une valeur numérique comprise entre 1 et 4.
    d) 1-6% en poids d'un polymétaphosphate de sodium soluble dans l'eau
    e) 0-3% en poids d'un polymétaphosphate de sodium soluble dans l'eau
    f) 0,5-4% en poids d'un agent épaississant
    g) 0-1% en poids de borax
  2. Composition lubrifiante selon la revendication 1, caractérisée en ce qu'il est mis en oeuvre une poudre de verre qui présente une granulométrie moyenne d50 de < à 100 µm et un domaine de ramollissement d'environ 700°C-900°C.
  3. Composition lubrifiante selon les revendications 1 ou 2, caractérisée en ce qu'il est mis en oeuvre un frittage de verre qui présente une granulométrie moyenne d50 de < à 100 µm et un domaine de ramollissement d'environ 500°C-700°C.
  4. Composition lubrifiante selon les revendications 1-3, caractérisée en ce que les silicates alcalin hydrosolubles sont utilisés individuellement ou en mélange, de la formule générale Me2O n Si2, Me signifiant le lithium, le potassium ou le sodium et n signifiant une valeur numérique entre 1 et 4.
  5. Composition lubrifiante selon les revendications 1-4, caractérisée en ce qu'en tant que polymétaphosphate de sodium hydrosoluble on utilise un sel de Graham de la formule générale (NaPO3) avec n inférieur à 450.
  6. Composition lubrifiante selon les revendications 1-5, caractérisée en ce qu'en tant que polymétaphosphate de sodium hydrosoluble, on utilise un sel de Maddrell de la formule générale (NaPO3)n avec n 40 à 70.
  7. Composition lubrifiante selon les revendications 1-6, caractérisée en ce que qu'en tant qu'agent épaississant, on utilise un polysaccharide, un dérivé polysaccharide ou un sel alcalin d'un polyacrylate.
  8. Composition lubrifiante selon les revendications 1-7, sous forme d'une dispersion aqueuse.
  9. Composition lubrifiante selon les revendications 1-8, sous forme d'une dispersion aqueuse avec une teneur en matière solide de 20 à 50%.
  10. Composition lubrifiante selon les revendications 1-9 pour l'utilisation sur des pièces d'usinage ayant des températures de surface à partir de 800°C constituées par
    a1) 0-20% en poids d'une poudre de verre
    a2) 30-50% en poids d'un frittage de verre
    b) 20-25% en poids de graphite synthétique ou naturel
    c) 7-20% en poids d'un ou de plusieurs silicates alcalin de la formule générale Me2O n SiO2, Me étant le lithium, le potassium ou le sodium et n étant une valeur numérique entre 1 et 4.
    d) 2-6 % en poids d'un polymétaphosphate de sodium hydrosoluble
    e) 0-1% en poids d'un polymétaphosphate de sodium hydrosoluble
    f) 3-4% en poids d'un agent épaississant
    g) 0,2-0,7% en poids de borax
  11. Composition lubrifiante selon les revendications 1-9 pour l'application sur des pièces d'usinage ayant des températures de surface à partir de 1000°C constituées par:
    a1) 45-70% en poids d'une poudre de verre
    a2) 0-20% en poids d'un frittage de verre
    b) 20-25% en poids de graphite naturel ou synthétique
    c) 7-20% d'un ou de plusieurs silicates alcalin de la formule générale Me2O n SiO2, Me étant le lithium, potassium ou le sodium et n étant une valeur numérique entre 1 et 4.
    d) 1-2% en poids d'un polymétaphosphate de sodium hydrosoluble
    e) 0-1% en poids d'un polymétaphosphate de sodium
    f) 1,5-2 % en poids d'un agent épaississant
    g) 0-0,25% en poids de borax.
  12. Utilisation de la composition lubrifiante selon les revendications 1 à 11 pour la lubrification directe de pièces d'usinage ayant une température de surface d'environ 800°C jusqu'à 1000°C lors du formage à chaud de métaux.
EP96107611A 1995-05-16 1996-05-13 Composition lubrifiante convenant à l'application sur des pièces métalliques pour le formage à chaud Expired - Lifetime EP0743352B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI9630075T SI0743352T1 (en) 1995-05-16 1996-05-13 Lubricant composition suitable for application on metal workpieces during hot-forming

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH1416/95 1995-05-16
CH141695 1995-05-16
CH141695 1995-05-16

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EP0743352A1 EP0743352A1 (fr) 1996-11-20
EP0743352B1 true EP0743352B1 (fr) 1999-07-28

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AR (1) AR001910A1 (fr)
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BR (1) BR9602185A (fr)
CA (1) CA2174825A1 (fr)
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DE (1) DE59602520D1 (fr)
ES (1) ES2136916T3 (fr)
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ATE182612T1 (de) 1999-08-15
RU2153525C2 (ru) 2000-07-27
TW324739B (en) 1998-01-11
SI0743352T1 (en) 1999-10-31
HU219309B (en) 2001-03-28
CN1063479C (zh) 2001-03-21
DE59602520D1 (de) 1999-09-02
AR001910A1 (es) 1997-12-10
JPH08311479A (ja) 1996-11-26
EP0743352A1 (fr) 1996-11-20
TR199600394A2 (tr) 1996-12-21
CA2174825A1 (fr) 1996-11-17
NO962019L (no) 1996-11-18
CN1143107A (zh) 1997-02-19
MX9601821A (es) 1997-07-31
NO962019D0 (no) 1996-05-15
BR9602185A (pt) 1998-04-07
ZA963198B (en) 1996-10-25
CZ140596A3 (en) 1996-12-11
RO116817B1 (ro) 2001-06-29
SK61996A3 (en) 1997-07-09
US5691282A (en) 1997-11-25
ES2136916T3 (es) 1999-12-01
JP2930003B2 (ja) 1999-08-03
HUP9601314A2 (en) 1997-02-28
HU9601314D0 (en) 1996-07-29
KR960041327A (ko) 1996-12-19
HUP9601314A3 (en) 1998-07-28

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