EP0743352B1 - Lubricant composition suitable for application on metal workpieces during hot-forming - Google Patents

Lubricant composition suitable for application on metal workpieces during hot-forming 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
Authority
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
Other languages
German (de)
French (fr)
Other versions
EP0743352A1 (en
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
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
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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/en
Publication of EP0743352A1 publication Critical patent/EP0743352A1/en
Application granted granted Critical
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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
    • 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
    • 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
    • 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
    • C10M103/00—Lubricating compositions characterised by the base-material being an inorganic material
    • 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
    • C10M103/00—Lubricating compositions characterised by the base-material being an inorganic material
    • C10M103/02—Carbon; Graphite
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    • C10M103/00—Lubricating compositions characterised by the base-material being an inorganic material
    • C10M103/06—Metal compounds
    • C—CHEMISTRY; METALLURGY
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    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M125/00—Lubricating compositions characterised by the additive being an inorganic material
    • C10M125/24—Compounds containing phosphorus, arsenic or antimony
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    • C10M125/00—Lubricating compositions characterised by the additive being an inorganic material
    • C10M125/26—Compounds containing silicon or boron, e.g. silica, sand
    • C—CHEMISTRY; METALLURGY
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    • C10M145/00—Lubricating compositions characterised by the additive being a macromolecular compound containing oxygen
    • C10M145/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M145/10—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate
    • C10M145/12—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate monocarboxylic
    • C10M145/14—Acrylate; Methacrylate
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    • C10M145/40—Polysaccharides, e.g. cellulose
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    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/003—Inorganic compounds or elements as ingredients in lubricant compositions used as base material
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    • C10M2201/02—Water
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    • C10M2201/0413—Carbon; Graphite; Carbon black used as base material
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    • C10M2201/042—Carbon; Graphite; Carbon black halogenated, i.e. graphite fluoride
    • C10M2201/0423—Carbon; Graphite; Carbon black halogenated, i.e. graphite fluoride used as base material
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    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/04—Elements
    • C10M2201/043—Sulfur; Selenenium; Tellurium
    • C10M2201/0433—Sulfur; Selenenium; Tellurium used as base material
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    • C10M2201/061—Carbides; Hydrides; Nitrides
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    • C10M2201/0663—Molybdenum sulfide used as base material
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    • 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

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Description

Die Erfindung betrifft eine neue Schmiermittelzusammensetzung für die Anwendung auf Werkstücken bei der Heissumformung von Metallen, insbesondere für die Anwendung beim Warmwalzen von Blöcken und Profilen oder bei der Herstellung von Hohlblöcken in sogenannten Stossbankanlagen.
Aufgrund der Tatsache, dass die zu verarbeitenden Metalle eine Oberflächentemperatur von ca. 800 °C bis 1300 °C aufweisen, hat man sich in der Praxis bisher auf die Schmierung der Werkzeuge konzentriert, die mit Temperaturen von maximal 400 °C der klassischen Schmierung besser zugänglich sind.
Obwohl im Stand der Technik z.B. in der CH-PS 660 023 offenbart wird, dass mit der dort genannten Schmiermitteldispersion auch Werkstücke mit Temperaturen über 600 °C behandelt werden können, zeigt der Praxisvergleich keine Ausbildung eines wirksamen haftenden Schmiermittelfilms bei Temperaturen im Bereich von 800 °C bis 1300 °C. Die fehlende Haftung wird im wesentlichen verursacht durch die sofortige Pyrolyse der organischen Bestandteile, die eine Haftung des Films verunmöglicht. Die Pyrolyse der organischen Bestandteile mit der damit verbundenen Rauchentwicklung ist zudem für das Arbeitsumfeld eine sehr unangenehme Begleiterscheinung. Eine Ausbildung eines Schmiermitttelfilms war im Praxistest auch bei den in Pulverform applizierten Schmiermittel/Beizmittel-Zusammensetzungen der CH-PS 670 106 nicht festzustellen. Alleine die gleichmässige Applikation eines Pulvergemisches bildet in diesem Fall ein beträchtliches Erschwernis.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. can also be treated with the lubricant dispersion mentioned there, the practical comparison shows no formation of an effective adhesive lubricant film at temperatures in the range of 800 ° C to 1300 ° C. The lack of adhesion is essentially caused by the immediate pyrolysis of the organic components, which makes it impossible for the film to adhere. The pyrolysis of the organic components with the associated smoke development is also a very unpleasant side effect for the work environment. The formation of a lubricant film was not found in the practical test, even with the lubricant / mordant compositions of CH-PS 670 106 applied in powder form. In this case, the uniform application of a powder mixture alone makes it considerably more difficult.

JP-A-5 516 897 offenbart einen Hochtemperaturschmierstoff für die Heissumformung von Metallen hergestellt aus Glaspulver mit niedrigem Schmezpunkt, Graphitpulver und Alkalisilikat als Binder. Der auf heissen, Werkstückoberflächen aufgetragene Hochtemperaturschmierstoff bildet einen Schmiermittelfilm bestehend aus in geschmolzenem Glaspulver dispergierten Graphit.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. The one applied to hot workpiece surfaces High temperature lubricant forms a lubricant film consisting of graphite dispersed in molten glass powder.

Aber auch die Schmierung der Werkzeuge ist je nach Werkzeugtyp mit verschiedenen Schwierigkeiten behaftet. So ist die Applikation des Schmiermittels alleine wegen der Geometrie des Werkzeuges vielfach erschwert oder tiefe Werkzeugtemperaturen um 100 °C erlauben keine richtige Ausbildung eines Schmiermittelfilms. Dadurch, dass die Werkzeuge dauernd mit grossen Mengen Kühlwasser behandelt werden, sind zudem grosse Verluste an Schmiermittel die Regel, was eine Kontamination des Abwassers und eine entsprechende Nachbehandlung des Abwassers mit sich bringt. Für eine gute Schmierung sind daher relativ grosse Mengen an Schmiermittel erforderlich.Depending on the type of tool, 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.

Es bestand folglich die Aufgabe, eine Schmiermittelzusammensetzung zu entwickeln, die die genannten Nachteile nicht aufweist und folglich geeignet ist Werkstücke mit Oberflächentemperaturen von 800 °C bis 1300 °C mit einem gleichmässigen, gut haftenden und wasserunlöslichen Schmiermittelfilm zu versehen. It was therefore the task to develop a lubricant composition that the does not have the disadvantages mentioned and is therefore suitable for workpieces with surface temperatures from 800 ° C to 1300 ° C with an even, adherent and to provide water-insoluble lubricant film.

Die Aufgabe konnte gelöst werden mit den neuen Schmiermittelzusammensetzungen gemäß Patentanspruch 1, welche besteht aus:

  • a1) 0-80 Gew.-% eines Glaspulvers
  • a2) 0-50 Gew.-% einer Glasfritte
    • wobei der Anteil von zumindest einem der Bestandteile a1) oder a2) in der Schmiermittelzusammensetzung nicht 0 Gew.-% ist.
  • b) 10-25 Gew.-% natürlicher oder synthetischer Graphit
  • c) 5-20 Gew.-% eines oder mehrerer Alkalisilikate der allgemeinen Formel Me2O n SiO2, worin Me Lithium, Kalium oder Natrium und n einen Zahlenwert zwischen 1 und 4 bedeutet.
    •
  • d) 1-6 Gew.-% eines wasserlöslichen Natriumpolymetaphosphates
  • e) 0-3 Gew.-% eines wasserunlöslichen Natriumpolymetaphosphates
  • f) 0,5-4 Gew.-% eines Verdickungsmittels
  • g) 0-1 Gew.-% Borax
    •  The problem was solved with the new lubricant compositions according to claim 1, which consists of:
  • a 1 ) 0-80% by weight of a glass powder
  • a 2 ) 0-50% by weight of a glass frit
    • wherein the proportion of at least one of the components a 1 ) or a 2 ) in the lubricant composition is not 0% by weight.
  • b) 10-25% by weight of natural or synthetic graphite
  • c) 5-20% by weight of one or more alkali silicates of the general formula Me 2 O n SiO 2 , in which Me is lithium, potassium or sodium and n is a numerical value between 1 and 4.
  • d) 1-6% by weight of a water-soluble sodium polymetaphosphate
  • e) 0-3% by weight of a water-insoluble sodium polymetaphosphate
  • f) 0.5-4% by weight of a thickener
  • g) 0-1% by weight borax

    • Für die Anwendung bei Werkstücken mit Oberflächentemperaturen ab 800°C wird bevorzugt eine Schmiermittelzusammensetzung verwendet, welche besteht aus:

  • a1) 0-20 Gew.-% eines Glaspulvers
  • a2) 30-50 Gew.-% einer Glasfritte
  • b) 20-25 Gew.-% natürlicher oder synthetischer Graphit
  • c) 7-20 Gew.-% eines oder mehrerer Alkalisilikate der allgemeinen Formel Me2O n SiO2, worin Me Lithium, Kalium oder Natrium und n einen Zahlenwert zwischen 1 und 4 bedeutet.
  • d) 2-6 Gew.-% eines wasserlöslichen Natriumpolymetaphosphates
  • e) 0-1 Gew.-% eines wasserunlöslichen Natriumpolymetaphosphates
  • f) 3-4 Gew.-% eines Verdickungsmittels
  • g) 0,2-0,7 Gew.-% Borax
    •  For use with workpieces with surface temperatures above 800 ° C, a lubricant composition is preferably used, which consists of:
  • a 1 ) 0-20% by weight of a glass powder
  • a 2 ) 30-50% by weight of a glass frit
  • b) 20-25% by weight of natural or synthetic graphite
  • c) 7-20% by weight of one or more alkali silicates of the general formula Me 2 O n SiO 2 , in which Me is lithium, potassium or sodium and n is a numerical value between 1 and 4.
  • d) 2-6% by weight of a water-soluble sodium polymetaphosphate
  • e) 0-1% by weight of a water-insoluble sodium polymetaphosphate
  • f) 3-4% by weight of a thickener
  • g) 0.2-0.7% by weight borax

    • Für die Anwendung bei Werkstücken mit Oberflächentemperaturen ab 1000°C wird bevorzugt eine Schmiermittelzusammensetzung verwendet, welche besteht aus:

  • a1) 45-70 Gew.-% eines Glaspulvers
  • a2) 0-20 Gew.-% einer Glasfritte
  • b) 20-25 Gew.-% natürlicher oder synthetischer Graphit
  • c) 7-20 Gew.-% eines oder mehrerer Alkalisilikate der allgemeinen Formel Me2O n SiO2, worin Me Lithium, Kalium oder Natrium und n einen Zahlenwert zwischen 1 und 4 bedeutet,
  • d) 1 - 2 Gew.% eines wasserlöslichen Natriumpolymetaphosphates
  • e) 0 - 1 Gew.% eines wasserunlöslichen Natriumpolymetaphosphates
  • f) 1,5 - 2 Gew.% eines Verdickungsmittels
  • g) 0 - 0,25 Gew.% Borax
    • For use with workpieces with surface temperatures above 1000 ° C, a lubricant composition is preferably used, which consists of:
  • a 1 ) 45-70% by weight of a glass powder
  • a 2 ) 0-20% by weight of a glass frit
  • b) 20-25% by weight of natural or synthetic graphite
  • c) 7-20% by weight of one or more alkali silicates of the general formula Me 2 O n SiO 2 , in which Me is lithium, potassium or sodium and n is a numerical value between 1 and 4,
  • d) 1-2% by weight of a water-soluble sodium polymetaphosphate
  • e) 0-1% by weight of a water-insoluble sodium polymetaphosphate
  • f) 1.5-2% by weight of a thickener
  • g) 0-0.25% by weight borax

    • Als Glaspulver wird zweckmässig ein Normalglas mit einem durchschnittlichen Korndurchmesser d50 von <100µm und einem Erweichungsbereich von ca. 700 °C bis 900 °C verwendet (CAS Nr. 65997-17-3). Das Glaspulver ist massgeblich verantwortlich für die ausgezeichneten Filmeigenschaften des Schmiermittels. Durch seinen relativ hohen Erweichungspunkt gelangt es in zunehmender Menge dann zum Einsatz wenn die Oberflächentemperaturen des Werkstücks die 1000°C Grenze übersteigt.A normal glass with an average grain diameter d 50 of <100 µm 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.

    Im Gegensatz dazu findet die Glasfritte vorallem dann Anwendung, wenn die Anwendungstemperaturen im unteren Bereich ab ca. 800 °C liegen.
    Dann kommen, aufgrund des im Vergleich zum Glaspulver tieferen Erweichungsbereichs von ca. 500 °C bis 700 °C, die filmbildenden Eigenschaften der Glasfritte voll zum tragen. Die Glasfritte ist zweckmässig von seiner chemischen Zusammensetzung her ein Alkali-Erdalkali-Alumo-Bor-Silikat und wird üblicherweise in einer durchschnittlichen Korngrösse d50 von <100µm angewendet.    In contrast, 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 μm.

    Glaspulver und Glasfritte sind je nach Anwendung in den angegebenen Grenzen in beliebigen Mischverhältnissen einsetzbar.Depending on the application, glass powder and glass frit are available in any of the specified limits Mixing ratios can be used.

    Ein weiterer wesentlicher Bestandteil bildet der Graphit. Es ist sowohl ein synthetischer Graphit als auch ein Naturgraphit anwendbar.
    Zweckmässig ist die durchschnittliche Korngrösse d50 des verwendeten Graphits kleiner 100 µm. Von Vorteil wird ein Graphit mit hoher Kristallinität d. h. mit einer Kristallitlänge Lc von grösser 100 nm eingesetzt.    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 μm. A graphite with high crystallinity, ie with a crystallite length Lc of greater than 100 nm, is advantageously used.

    Eine wesentliche Funktion als Binder nehmen die wasserlöslichen Alkalisilikate ein. Es werden wasserlösliche Alkalisilikate, einzeln oder im Gemisch, der allgemeinen Formel Me2O n SiO2 verwendet, worin Me Lithium, Kalium oder Natrium und n einen Zahlenwert zwischen 1 und 4 bedeutet. Bevorzugt kommt ein Natriummetasilikat der genannten allgemeinen Formel mit n = 1 - 1,5 oder ein Natriumsilikat mit n = 3,3 - 3,5 (Wasserglas) oder eine eutektische Mischung des genannten Natriumsilikate mit einem Kaliumsilikat der allgemeinen Formel K2O n SiO2 worin n 2,4 - 3 bedeutet und/oder einem Lithiumsilikat der allgemeinen Formel Li2O n SiO2, worin n 2,4 - 3 bedeutet, zur Anwendung.
    Besonders bevorzugt wird eine Mischung der genannten bevorzugten Alkalisilikate im Verhältnis Natriumsilikat:Kaliumsilikat:Lithiumsilikat von 12,3% : 67,5% : 20,7% verwendet.    The water-soluble alkali silicates play an essential role as binders. There are water-soluble alkali silicates, individually or in a mixture, of the general formula Me 2 O n SiO 2 used, in which Me is lithium, potassium or sodium and n is a numerical value between 1 and 4. Preferably comes a sodium metasilicate of the general formula mentioned with n = 1-1.5 or a sodium silicate with n = 3.3-3.5 (water glass) or a eutectic mixture of the said sodium silicate with a potassium silicate of the general formula K 2 O n SiO 2 in which n is 2.4-3 and / or a lithium silicate of the general formula Li 2 O n SiO 2 , in which n is 2.4-3, for use.
    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.

    Als Schmiermittelbestandteil der die Schaumbildung unterdrückt, fungiert ein wasserlösliches Natriummetapolyphosphat. Zweckmässig wird darunter eine Verbindung mit der allgemeinen Formel (NaPO3)n worin n kleiner 450 ist, verstanden. Diese Verbindungen sind auch unter der Bezeichnung "Hexametaphosphat" oder "Grahamsches Salz" bekannt.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".

    Es ist desweiteren möglich ein wasserunlösliches Natriummetapolyphosphat als Binder zuzusetzen. Besonders geeignet sind dazu die unter dem Namen "Maddrellsches Salz" bekannten Verbindungen der allgemeinen Formel (NaPO3)n, worin n 40 bis 70 bedeutet.It is also possible to add 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.

    Der Zusatz eines Verdickungsmittels zweckmässig eines Polysaccharids oder eines Polysaccharidderivates ist entscheidend für die Gewährleistung einer konstanten Viskosität und Stabilität der Schmiermitteldispersion über einen weiten Temperaturbereich, sowie für die Verhinderung der Sedimentation der Feststoffanteile in der Dispersion. Zweckmässig finden Biopolysaccharide wie Xanthan-Gummi, Rhamsan-Gummi oder eine Alkylcellulose wie die Hydroxymethylcellulose, Anwendung.The addition of 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. Find appropriate Biopolysaccharides like xanthan gum, rhamsan gum or an alkyl cellulose like that Hydroxymethyl cellulose, application.

    Mit einem entsprechenden Resultat lassen sich als Verdickungsmittel Alkalisalze der Polyacrylsäure, insbesondere Natriumpolyacrylate zusetzen.With a corresponding result, alkali salts of the Add polyacrylic acid, especially sodium polyacrylates.

    Zur Verhinderung eines bakteriellen Angriffs wird der Schmiermittelzusammensetzung zweckmässig ein handelsübliches Biocid in zugegeben.To prevent bacterial attack, the lubricant composition expediently added a commercially available biocide.

    Schliesslich ist es möglich als Haftvermittler Borax (Natriumtetraborat-Decahydrat) zuzusetzen.
    Das erfindungsgemässe Schmiermittel wird zweckmässig in Form einer wässrigen Dispersion mit einem Feststoffanteil von vorzugsweise 20% bis 50% angewendet. Es ist durchaus möglich, die Grenzen nach oben und unten zu variieren. Die Herstellung der Dispersion kann in handelsüblichen Dispergiergeräten, die hohe Scherkräfte ermöglichen, erfolgen (vgl. z.B. EP-PS 218 989).
    Die anwendungsbereite Dispersion weist zweckmässig eine Viskosität im Bereich von 1000 MPas bis 7000 MPas (Rheomat 15, 20 °C, Zelle B, Geschwindigkeit 5) auf, kann aber über den Zusatz von Verdickungsmittel weiter variiert werden.     Finally, it is possible to add borax (sodium tetraborate decahydrate) as an adhesion promoter.
    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.

    Die Applikation der Schmiermitteldispersion kann über bekannte Systeme zum Versprühen von dispersen Systemen erfolgen (vgl. z.B. EP-A 453 801).The application of the lubricant dispersion can be done via known systems for spraying disperse systems (see e.g. EP-A 453 801).

    Erfindungsgemäss wird die vorstehend offenbarte Schmiermittelzusammensetzung für die Anwendung auf Werkstücken, die Oberflächentemperaturen von 800 °C bis 1300 °C aufweisen, bei der Heissumformung von Metallen, insbesondere beim Warmwalzen von Blöcken und Profilen oder bei der Herstellung von Hohlblöcken in sog. Stossbankanlagen verwendet. Die Auftragung der Dispersion auf das Werkstück erfolgt dabei unmittelbar vor der Umformung. Eine vorgängige Entzunderung des Werkstückes ist von Vorteil aber nicht zwingend. Nach dem sofortigen Verdampfen des Wassers bildet sich innert weniger Sekunden ein gleichmässiger, wasserunlöslicher Schmierfilm auf der Werkstückoberfläche aus, der durch den nachfolgenden Umformungsvorgang nicht beeinträchtigt wird. According to the invention, 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.

    Beispiele:Examples:

    Die nachstehenden Viskositätsangaben wurden in einem Rheomat 15, 20 °C, Zelle B, Geschwindigkeit 5) gemessen.The following viscosity data were in a Rheomat 15, 20 ° C, cell B, Speed 5) measured.

    Formulation 1 (geeignet für Werkstücke mit Oberflächentemperaturen von 850 °C - 1200 °C). Formulation 1 (suitable for workpieces with surface temperatures of 850 ° C - 1200 ° C).

  • 49,17 Gew.% Glasfritte (Bindefritte K2244 mit d70 < 100µm, Schauer Co,A-Wien)49.17% by weight glass frit (binding frit K2244 with d 70 <100µm, Schauer Co, A-Vienna)
  • 25,00 Gew.% Graphit (synthetischer Graphit T 75 mit d50 24µm, LONZA G&T,CH-Sins)25.00% by weight graphite (synthetic graphite T 75 with d 50 24µm, LONZA G & T, CH-Sins)
  • 15,67 Gew.% Wasserglas (wasserlösl.Natriumsilikat Na2O n SiO2 mit n=3,3 - 3,5)15.67% by weight of water glass (water-soluble sodium silicate Na 2 O n SiO 2 with n = 3.3 - 3.5)
  • 6,00 Gew.% wasserlösl. Natriumpolyphosphat (Alcopon, Benckiser-Knapsack, D-Ladenburg)6.00% by weight water-soluble. Sodium polyphosphate (Alcopon, Benckiser-Knapsack, D-Ladenburg)
  • 3,33 Gew.% Hydroxymethylcellulose (Dow Chemical)3.33% by weight hydroxymethyl cellulose (Dow Chemical)
  • 0,67 Gew.% Borax0.67% by weight borax
  • 0,16 Gew.% Biozid0.16% by weight biocide
  • Dispersion: % Gehalt in Wasser 20%Dispersion:% water content 20%
  • Viskosität: 1000-2000 MPasViscosity: 1000-2000 MPas

    • Formulation 2 (geeignet für Werkstücke mit Oberflächentemperaturen von 1000 °C - 1250 °C) Formulation 2 (suitable for workpieces with surface temperatures of 1000 ° C - 1250 ° C)

  • 64,85 Gew.% Glaspulver (Glasmehl 300 mit d70 kleiner 63 µm der Mineralienwerke Kuppenheim)64.85% by weight of glass powder (glass powder 300 with d 70 smaller than 63 µm from Mineralienwerke Kuppenheim)
  • 24,94 Gew.% Graphit (synthetischer Graphit T 75 mit d50 24µm, LONZA G&T, CH-Sins)24.94% by weight graphite (synthetic graphite T 75 with d 50 24µm, LONZA G&T, CH-Sins)
  • 6,98 Gew.% wasserlösl. Natriumsilikat (Na2O n SiO2 mit n=1 - 1,15)6.98% by weight water-soluble. Sodium silicate (Na 2 O n SiO 2 with n = 1 - 1.15)
  • 1,67 Gew.% wasserlösl. Natriumpolyphosphat (Alcopon, Benckiser-Knapsack, D-Ladenburg1.67% by weight water-soluble. Sodium polyphosphate (Alcopon, Benckiser-Knapsack, D-Ladenburg
  • 1,33 Gew.% Hydroxymethylcellulose (Dow Chemical)1.33% by weight hydroxymethyl cellulose (Dow Chemical)
  • 0,22 Gew.% Xanthan-Gummi0.22% by weight of xanthan gum
  • 0,01 Gew.% Biozid0.01% by weight of biocide
  • Dispersion: % Gehalt in Wasser 40%Dispersion:% water content 40%
  • Viskosität: 1000 - 3000 MPasViscosity: 1000 - 3000 MPas

    • Formulation 3 (geeignet für Werkstücke mit Oberflächentemperaturen von 1000 °C - 1250 °C) Formulation 3 (suitable for workpieces with surface temperatures of 1000 ° C - 1250 ° C)

  • 47,78 Gew.% Glaspulver (Glasmehl 300 mit d70 kleiner 63 µm der Mineralienwerke Kuppenheim)47.78% by weight of glass powder (glass powder 300 with d 70 smaller than 63 µm from Mineralienwerke Kuppenheim)
  • 16,53 Gew.% Glasfritte (Bindefritte K2244 mit d70 < 100µm, Schauer Co., A-Wien)16.53% by weight glass frit (binding frit K2244 with d 70 <100µm, Schauer Co., A-Vienna)
  • 24,84 Gew.% Graphit (synthetischer Graphit T 75 mit d50 24 µm, LONZA G&T, CH-Sins)24.84% by weight graphite (synthetic graphite T 75 with d 50 24 µm, LONZA G&T, CH-Sins)
  • 6,74 Gew.% wasserlösl. Alkalisilikatmischung (Natriumsilikat:Kaliumsilikat:Lithiumsilikat6.74% by weight water-soluble. Alkali silicate mixture (sodium silicate: potassium silicate: lithium silicate
  • 12,3 : 67,5 : 20,7, Me2O n SiO2 mit n=2,7)12.3: 67.5: 20.7, Me 2 O n SiO 2 with n = 2.7)
  • 1,32 Gew.% wasserlösl. Natriumpolyphosphat (Alcopon, Benckiser-Knapsack, D-Ladenburg)1.32% by weight water-soluble. Sodium polyphosphate (Alcopon, Benckiser-Knapsack, D-Ladenburg)
  • 0,92 Gew.% waserunlösl. Natriumpolyphosphat (Dentphos M, Benckiser-Knapsack, D-Ladenburg)0.92% by weight water insoluble. Sodium polyphosphate (Dentphos M, Benckiser Knapsack, D-Ladenburg)
  • 0,25 Gew.% Borax0.25% by weight borax
  • 0,45 Gew.% Xanthan-Gummi0.45% by weight xanthan gum
  • 1,10 Gew.% Hydroxymethylcellulose (Dow Chemical)1.10% by weight hydroxymethyl cellulose (Dow Chemical)
  • 0,07 Gew.% Biozid0.07% by weight biocide
  • Dispersion: % Gehalt in Wasser 40%Dispersion:% water content 40%
  • Viskosität: 2000 - 5000 MPasViscosity: 2000 - 5000 MPas

    • Formulation 4 (geeignet für Werkstücke mit Oberflächentemperaturen von 850 °C - 1250 °C) Formulation 4 (suitable for workpieces with surface temperatures of 850 ° C - 1250 ° C)

  • 49,53 Gew.% Glasfritte (Bindefritte K2244 mit d70 < 100 µm, Schauer Co., A-Wien)49.53% by weight glass frit (binding frit K2244 with d 70 <100 µm, Schauer Co., A-Vienna)
  • 24,76 Gew.% Graphit (synthetischer Graphit T 75 mit d50 24µm, LONZA G&T, CH-Sins)24.76% by weight graphite (synthetic graphite T 75 with d 50 24µm, LONZA G&T, CH-Sins)
  • 6,74 Gew.% wasserlösl. Alkalisilikatmischung (Natriumsilikat:Kaliumsilikat:Lithiumsilikat6.74% by weight water-soluble. Alkali silicate mixture (sodium silicate: potassium silicate: lithium silicate
  • 12,3 : 67,5 : 20,7, Me2O n SiO2 mit n=2,7)12.3: 67.5: 20.7, Me 2 O n SiO 2 with n = 2.7)
  • 2,64 Gew.% wasserlösl. Natriumpolyphosphat (Alcopon, Benckiser-Knapsack, D-Ladenburg2.64% by weight water-soluble. Sodium polyphosphate (Alcopon, Benckiser-Knapsack, D-Ladenburg
  • 1,32 Gew.% waserunlösl. Natriumpolyphosphat (Dentphos M, Benckiser-Knapsack, D-Ladenburg)1.32% by weight water insoluble. Sodium polyphosphate (Dentphos M, Benckiser Knapsack, D-Ladenburg)
  • 0,66 Gew.% Borax0.66% by weight borax
  • 3,30 Gew.% Hydroxymethylcellulose (Dow Chemical)3.30% by weight hydroxymethyl cellulose (Dow Chemical)
  • 0,71 Gew.% Natriumpolyacrylat (Carbopol, Goodrich Chemical)0.71% by weight sodium polyacrylate (Carbopol, Goodrich Chemical)
  • 0,14 Gew.% Biozid0.14% by weight biocide
  • Dispersion: % Gehalt in Wasser 20%Dispersion:% water content 20%
  • Viskosität: 2000 - 5000 MPasViscosity: 2000 - 5000 MPas

    • Vergleichsformulation 1: (gemäss CH-PS 660 023, Beispiel 1)Comparative formulation 1: (according to CH-PS 660 023, example 1)

  • 54 Gew.% kristalliner Graphit54% by weight of crystalline graphite
  • 11 Gew.% Maddrellsches Salz11% by weight of Maddrell's salt
  • 5 Gew.% Borax5% by weight borax
  • 10 Gew.% Natriumsilikat (Wasserglas SiO2/Na2O = 3,3)10% by weight sodium silicate (water glass SiO 2 / Na 2 O = 3.3)
  • 18 Gew.% Polyethylen18% by weight of polyethylene
  • 2 Gew.% Alkylcellulose2% by weight alkyl cellulose
  • wässrige Dispersion mit Feststoffgehalt von 30 Gew.%aqueous dispersion with a solids content of 30% by weight
  • Viskosität 1900 MPasViscosity 1900 MPas

    • Vergleichsformulation 2: (gemäss CH-PS 670 106, Beispiel 2)Comparative formulation 2: (according to CH-PS 670 106, example 2)

  • 70 Gew.% Natriumtripolyphosphat (Na5P3O10)70% by weight sodium tripolyphosphate (Na 5 P 3 O 10 )
  • 4 Gew.% Graphit4% by weight graphite
  • 26 Gew.% Na2B2O4 8 H2O26% by weight Na 2 B 2 O 4 8 H 2 O

    • Pulvermischung:Powder mixture: Vergleichstest:Comparative test: Testbedingungen:Test conditions:

    Auf die 800 °C bis 1050 °C heisse Oberfläche eines vertikal, mit 1,5 m/s bewegten Stahlblocks mit den Masssen 29 cm x 6cm x 3cm werden über eine, im Abstand von 43 cm befindliche Düse (Druck 50 bar) die Formulationen 1 bis 4, sowie die Vergleichsformulation 1 aufgesprüht. Die Vergleichsformulation 2 wird trocken gesprüht gemäss CH-PS 670 106. Der gebildete Schmiermittelfilm wird nach den folgenden Klassierungen bewertet.On the 800 ° C to 1050 ° C hot surface of a steel block moved vertically at 1.5 m / s with the dimensions 29 cm x 6cm x 3cm are over a, at a distance of 43 cm Nozzle (pressure 50 bar) formulations 1 to 4, as well as comparative formulation 1 sprayed on. The comparison formulation 2 is sprayed dry according to CH-PS 670 106. The Lubricant film formed is rated according to the following classifications.

    Klasse 1class 1

    Keine Bildung eines Schmiermittelfilms. No formation of a lubricant film.

    Klasse 22nd grade

    Bildung eines brüchigen Schmiermittelfilms mit nur kurzzeitiger (wenige Sekunden) Haftung.Formation of a brittle film of lubricant with only brief (a few seconds) adhesion.

    Klasse 3Class 3

    Sofortige Bildung eines gleichmässigen, glasurähnlichen, gut haftenden Schmiermittelfilms mit hoher mechanischer Beständigkeit und hoher Wasserbeständigkeit.Immediate formation of a uniform, glaze-like, well adhering lubricant film with high mechanical resistance and high water resistance.

    Testergebnisse:Test results:

    FormulationFormulation Testergebnis (Klasse)Test result (class) 11 3 (ab 850 °C)3 (from 850 ° C) 22nd 3 (ab 1000 °C)3 (from 1000 ° C) 33rd 3 (ab 1000 °C)3 (from 1000 ° C) 44th 3 (ab 850 °C)3 (from 850 ° C) Vergleich 1Comparison 1 11 Vergleich 2Comparison 2 22nd

    Claims (12)

    1. Lubricant composition for use on work pieces during hot forming of metals consisting of
      a1) 0-80 wt.% of a glass powder
      a2) 0-50 wt.% of a glass frit
      wherein the proportion of at least one of the constituents a1) or a2) in the lubricant composition is not 0 wt.% %
      b) 10-25 wt.% of natural or synthetic graphite
      c) 5-20 wt.% of one or more alkali metal silicates of the general formula Me2O n SiO2, in which Me means lithium, potassium or sodium and n means a numerical value between 1 and 4
      d) 1-6 wt.% of a water-soluble sodium polymetaphosphate
      e) 0-3 wt.% of a water-insoluble sodium polymetaphosphate
      f) 0.5-4 wt.% of a thickener
      g) 0-1 wt.% of borax.
    2. Lubricant composition according to patent claim 1, characterised in that a glass powder is used which has an average grain diameter d50 of <100 µm and a softening range of approx. 700°C-900°C.
    3. Lubricant composition according to patent claims 1 or 2, characterised in that a glass frit is used which has an average grain diameter d50 of <100 µm and a softening range of approx. 500°C-700°C.
    4. Lubricant composition according to patent claims 1-3, characterised in that water-soluble alkali metal silicates of the general formula Me2O n SiO2 in which Me means lithium, potassium or sodium and n means a numerical value of between 1 and 4 are used individually or as a mixture.
    5. Lubricant composition according to patent claims 1-4, characterised in that the water-soluble sodium polymetaphosphate used is a Graham's salt of the general formula (NaPO3)n where n is less than 450.
    6. Lubricant composition according to patent claims 1-5, characterised in that the water-insoluble sodium polymetaphosphate used is a Maddrell's salt of the general formula (NaPO3)n where n is 40 to 70.
    7. Lubricant composition according to patent claims 1-6, characterised in that the thickener used is a polysaccharide, a polysaccharide derivative or an alkali metal salt of a polyacrylate.
    8. Lubricant composition according to patent claims 1-7 in the form of an aqueous dispersion.
    9. Lubricant composition according to patent claims 1-8 in the form of an aqueous dispersion having a solids content of 20% to 50%.
    10. Lubricant composition according to patent claims 1-9 for use on work pieces having surface temperatures of from 800°C consisting of:
      a1) 0-20 wt.% of a glass powder
      a2) 30-50 wt.% of a glass frit
      b) 20-25 wt.% of natural or synthetic graphite
      c) 7-20 wt.% of one or more alkali metal silicates of the general formula Me2O n SiO2, in which Me means lithium, potassium or sodium and n means a numerical value between 1 and 4
      d) 2-6 wt.% of a water-soluble sodium polymetaphosphate
      e) 0-1 wt.% of a water-insoluble sodium polymetaphosphate
      f) 3-4 wt.% of a thickener
      g) 0.2-0.7 wt.% of borax.
    11. Lubricant composition according to patent claims 1-9 for use on work pieces having surface temperatures of from 1000°C consisting of:
      a1) 45-70 wt.% of a glass powder
      a2) 0-20 wt.% of a glass frit
      b) 20-25 wt.% of natural or synthetic graphite
      c) 7-20 wt.% of one or more alkali metal silicates of the general formula Me2O n SiO2, in which Me means lithium, potassium or sodium and n means a numerical value between 1 and 4
      d) 1-2 wt.% of a water-soluble sodium polymetaphosphate
      e) 0-1 wt.% of a water-insoluble sodium polymetaphosphate
      f) 1.5-2 wt.% of a thickener
      g) 0-0.25 wt.% of borax.
    12. Use of the lubricant composition according to patent claims 1 to 11 for direct lubrication of work pieces having a surface temperature of approx. 800°C to 1300°C during hot forming of metals.
    EP96107611A 1995-05-16 1996-05-13 Lubricant composition suitable for application on metal workpieces during hot-forming Expired - Lifetime EP0743352B1 (en)

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    CH1416/95 1995-05-16
    CH141695 1995-05-16
    CH141695 1995-05-16

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    RU2153525C2 (en) 2000-07-27
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    SK61996A3 (en) 1997-07-09
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    NO962019L (en) 1996-11-18
    HUP9601314A3 (en) 1998-07-28
    ZA963198B (en) 1996-10-25
    CN1063479C (en) 2001-03-21
    HU219309B (en) 2001-03-28
    NO962019D0 (en) 1996-05-15
    CN1143107A (en) 1997-02-19
    ATE182612T1 (en) 1999-08-15

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