CH596294A5 - High temp. lubricants for hot forming of metals - Google Patents

High temp. lubricants for hot forming of metals

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Publication number
CH596294A5
CH596294A5 CH624274A CH624274A CH596294A5 CH 596294 A5 CH596294 A5 CH 596294A5 CH 624274 A CH624274 A CH 624274A CH 624274 A CH624274 A CH 624274A CH 596294 A5 CH596294 A5 CH 596294A5
Authority
CH
Switzerland
Prior art keywords
weight
graphite
metals
lubricants
hot forming
Prior art date
Application number
CH624274A
Other languages
English (en)
Inventor
Kurt Feneberger
Rolf Gely
Original Assignee
Lonza Ag
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
Application filed by Lonza Ag filed Critical Lonza Ag
Priority to CH624274A priority Critical patent/CH596294A5/de
Priority to GB4457174A priority patent/GB1438215A/en
Priority to IT53622/74A priority patent/IT1021859B/it
Priority to DE2450716A priority patent/DE2450716C3/de
Priority to US05/523,499 priority patent/US4052323A/en
Priority to SU742074765A priority patent/SU625621A3/ru
Priority to JP49131534A priority patent/JPS5937317B2/ja
Priority to FR7441870A priority patent/FR2270319B1/fr
Priority to CS753115A priority patent/CS196268B2/cs
Priority to CA226,398A priority patent/CA1054134A/en
Priority to SE7505263A priority patent/SE412919B/xx
Priority to DD185861A priority patent/DD120465A5/xx
Priority to RO7582160A priority patent/RO70139A/ro
Priority to ES437493A priority patent/ES437493A1/es
Priority to PL1975180250A priority patent/PL101948B1/pl
Priority to SU752175649A priority patent/SU632305A3/ru
Publication of CH596294A5 publication Critical patent/CH596294A5/de

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    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M7/00Solid or semi-solid compositions essentially based on lubricating components other than mineral lubricating oils or fatty oils and their use as lubricants; Use as lubricants of single solid or semi-solid substances
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    • C10M2201/00Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/02Water
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    • C10M2201/00Inorganic compounds or elements as ingredients in lubricant compositions
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    • C10M2201/041Carbon; Graphite; Carbon black
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    • C10M2201/0413Carbon; Graphite; Carbon black used as base material
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    • C10M2201/041Carbon; Graphite; Carbon black
    • C10M2201/042Carbon; Graphite; Carbon black halogenated, i.e. graphite fluoride
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    • C10M2201/041Carbon; Graphite; Carbon black
    • C10M2201/042Carbon; Graphite; Carbon black halogenated, i.e. graphite fluoride
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  • Lubricants (AREA)

Description


  
 



   Die Erfindung betrifft ein Hochtemperaturschmiermittel für die Warmverformung von Metallen.



   Es ist bekannt, Gemische aus Graphit und Öl anzuwenden.



  Bei der Anwendung solcher Produkte erfolgt eine Zersetzung der Öle, was sich nicht nur nachteilig auf die Materialeigenschaften von Werkzeug und Werkstücken auswirkt, sondern durch die Zersetzungsprodukte der Öle auch zu unzumutbaren Belästigungen der Umwelt führt.



   Es wurde beispielsweise vorgeschlagen, eine genau definierte Mischung von Alkalisulfat, Borax, Kaliumchlorid, Na   triumtriacetat    und Graphit, gegebenenfalls zusammen mit weiteren Zusätzen, in Form einer wässrigen Dispersion als Hochtemperaturschmiermittel für die spanlose Metallumformung anzuwenden (DAS 2 046 727). Damit soll erreicht werden, dass für den Einsatz in der Warmverformung von Metallen eine flüssige Schmelze, die notwendig sein soll, vorhanden ist.



   Es ist auch bekannt, einen Hochtemperaturschmierstoff aus einem Schmelzprodukt von Phosphaten und Boraten der Alkalimetalle und gegebenenfalls des Zinks und/oder Aluminiums und einem Zusatz von weiteren Komponenten zur Warmverformung von Metallen herzustellen (DAS 2   154232).   



   Schliesslich wurde ein festes Schmiermittel, bestehend hauptsächlich aus Graphit oder Wolframdisulfid und Natriumfluorid, vorgeschlagen. Das Schmiermittel soll zweckmässig in Pastenform angewandt werden (DAS 2 028 804).



   Auch Salzschmelzen konnten aber, insbesondere bei der Herstellung   nahtloser    Rohre auf sogenannten Pilgerstrassen oder Kontistrassen, nicht immer voll befriedigen.



   Bei den Hochtemperaturverformungsverfahren entstehen sehr hohe Temperaturen, wodurch die Viskosität solcher Schmelzen so weit sinkt, dass die Tragfähigkeit des Schmierfilms keine ausreichende Schmierung mehr gewährleistet.



   Ziel der Erfindung ist es, die genannten Nachteile zu vermeiden.



   Erfindungsgemäss wird dies mit einem Hochtemperaturschmiermittel erreicht, enthaltend: a) 10 bis 90 Gew. % Graphit, b) 2 bis 45 Gew. % Homo- oder Copolymerisat von olefinisch ungesättigten Monomeren, c)   0,5bis      8 Gew. % Dispergiermittel.   



   Das Hochtemperaturschmiermittel wird so hergestellt, dass man Graphit in eine wässrige Suspension eines Homo- oder Copolymerisats von olefinisch ungesättigten Monomeren und eines Dispergiermittels einbringt, so dass das Mittel 10 bis 90 Gew. % Graphit, 2 bis 45 Gew. % Homo- oder   Copolymers    sat von olefinisch ungesättigten Monomeren und 0,5 bis 8 Gew. % Dispergiermittel enthält.



   Die erfindungsgemässen Mittel werden in Form von wässrigen Suspensionen mit Feststoffgehalten von 5 bis 80 Gew. % als Hochtemperaturschmiermittel für die Warmverformung von Metallen verwendet.



   Die Homo- oder Copolymerisate von olefinisch ungesättigten Monomeren werden zweckmässig nach dem Emulsions Polymerisationsverfahren hergestellt. Beispielsweise können die Polymerisate oder Mischpolymerisate des Vinylacetats, Vinylpropionats, Vinyllaurats, Äthylens, Butadiens, der Acrylsäure, der Acrylsäure mit Copolymeren, des Styrols, des Maleinsäureesters usw. angewendet werden.



   Um einen optimalen Schmiereffekt zu erzielen, muss ein trockener Schmierfilm vorliegen. Die wässrige, das Schmiermittel enthaltende Suspension wird zweckmässig auf an sich bekannte Weise, wie Aufsprühen oder Aufstreichen, auf das heisse Werkzeug aufgebracht; dabei verdampft das Wasser und durch Schmelzen bildet das Polymerisat oder Mischpolymerisat einen zähviskosen Film. Die Filmdicke beträgt zweckmässig 0,05 bis 1,0 mm, vorzugsweise 0,1 bis 0,2 mm. In die sem Film orientieren sich die Graphitteilchen, aufgrund ihrer Struktur, plättchenförmig gleichmässig über die ganze Oberfläche. Zu Beginn des Bearbeitungsprozesses schwimmt das Werkstück gewissermassen auf dem Polymerfilm. Schliesslich brennt das Homo- oder Copolymerisat sauber ab, ohne Rückstände zu hinterlassen. Der Abbrand erzeugt ein Gaspolster, das die Trennung zwischen den Reibflächen unterstützt.



   Gleichzeitig ergibt der Graphit eine tragfähige Trenn- und Schmierschicht, die bei lokaler Überlastung und dadurch verursachtem Abreissen des hydrodynamisch wirkenden Schmelzfilms und besonders bei Spitzentemperaturen während des Prozesses wirksam wird.



   Durch den Abbrand der erfindungsgemässen Zusatzstoffe ist anzunehmen, dass eine Art Schutzatmosphäre zwischen Werkzeug und Werkstück entsteht, die den Abbrand von Graphit bei höheren Temperaturen verzögert.



   Der im erfindungsgemässen Hochtemperaturschmiermittel angewandte Graphit weist zweckmässig   eine Korngrösse    bis   höchstens 300 Lcm und eine Reinheit von wenigstens 96 %,    vorzugsweise eine Korngrösse bis   100,um    und eine Reinheit von   99,5 %,    auf.



   Der zur Anwendung gelangende Stabilisator (Dispergiermittel) ist ein Polysaccharid, eine   Alkylcellulose,    beispielsweise Methylcellulose, oder ein Alginat. Es kann auch vorteilhaft ein Netzmittel in geringen Mengen zur Suspension zugegeben werden.



   Das erfindungsgemässe Hochtemperaturschmiermittel kann grundsätzlich zur spanlosen Metallumformung angewendet werden, beispielsweise in Gesenkschmieden. Eine bevorzugte Anwendungsform ist die Schmierung des Dornes bei der Herstellung von nahtlosen Rohren, beispielsweise auf sogenannten Pilger-, Konti- oder MPM-Strassen.



   Beispiel
Einer wässrigen Suspension mit einem Anteil eines Vinylacetat-Mischpolymerisats von 31,1% und   3,3 %    eines Polysaccharids wird Graphit und Wasser zugemischt, so dass eine Suspension mit einem Gehalt von 20 % Graphit,    9,5%    Vinylacetat-Mischpolymerisat,
1 % Polysaccharid und 69,5% Wasser entsteht. Diese erfindungsgemässe Mischung wird auf den Dorn in einer MPM-Strasse, die zur Herstellung   nahtloser    Rohre dient, aufgesprüht.



   Die Zusammensetzung des Schmiermittels erlaubt es, den Schmierfilm während des Rücktransportes auf die Oberfläche des Dornes aufzusprühen. Auf der heissen Dornoberfläche bildet sich augenblicklich ein trockener wasserabstossender Film. Unmittelbar nach dem Auftragen des Films kann der Dorn im Wasserbad oder durch Aufdüsen von Wasser gekühlt werden, ohne dass der Schmierfilm abgetragen wird. Der Schmierfilm wird auch durch die intensive Wasserkühlung der Walzen, der der Dorn zu Beginn des Walzprozesses ausgesetzt ist, nicht beschädigt.



   Aus der Anwendung des Schmierfilms ergeben sich gegen über herkömmlichen Schmiermitteln Vorteile, wie in Wasser suspendierte physiologisch unbedenkliche Formulation, sauberer Abbrand (kein umweltfeindlicher Ölqualm). Das Schmiermittel hinterlässt eine blanke Dornoberfläche, ohne Rückstände. Die Leistung, die notwendig ist, um Rohre durch Walzwerke zu ziehen, wird erheblich verringert, die Walzgerüste arbeiten gleichmässiger und der Dornverschleiss wird stark verringert. Das Rohr umschliesst den Dorn gleichmässig, woraus eine bessere Rohrqualität resultiert, und es ist schliesslich auch möglich, mit einer gegebenen Anlage dünnere Rohrwandstärken zu erreichen. 

Claims (1)

  1. PATENTANSPRÜCHE
    I. Hochtemperaturschmiermittel für die Warmverformung von Metallen, enthaltend a) 10 bis 90 Gew. % Graphit, b) 2 bis 45 Gew. % Homo- oder Copolymerisat von olefinisch ungesättigten Monomeren, c) 0,5 bis 8 Gew. % Dispergiermittel.
    II. Verfahren zur Herstellung eines Hochtemperaturschmiermittels gemäss Patentanspruch I, dadurch gekennzeichnet, dass man Graphit in eine wässrige Suspension eines Homooder Copolymerisats von olefinisch ungesättigten Monomeren und eines Dispergiermittels einbringt, so dass das Mittel 10 bis 90 Gew. % Graphit, 2 bis 45 Gew. % Homo- oder Copolymerisat von olefinisch ungesättigten Monomeren und 0,5 bis 8 Gew. % Dispergiermittel enthält.
    III. Verwendung der Mittel gemäss Patentanspruch I in Form von wässrigen Suspensionen mit Feststoffgehalten von 5 bis 80 Gew. % als Hochtemperaturschmiermittel für die Warmverformung von Metallen.
CH624274A 1974-05-08 1974-05-08 High temp. lubricants for hot forming of metals CH596294A5 (en)

Priority Applications (16)

Application Number Priority Date Filing Date Title
CH624274A CH596294A5 (en) 1974-05-08 1974-05-08 High temp. lubricants for hot forming of metals
GB4457174A GB1438215A (en) 1974-05-08 1974-10-15 High temperature lubricant
IT53622/74A IT1021859B (it) 1974-05-08 1974-10-18 Lubrificante ad alta temperatura per il modellamento a caldo di metalli
DE2450716A DE2450716C3 (de) 1974-05-08 1974-10-25 Hochtemperaturschmiermittel für die Warmverformung von Metallen
US05/523,499 US4052323A (en) 1974-05-08 1974-11-13 High-temperature lubricant for the hot-working of metals
SU742074765A SU625621A3 (ru) 1974-05-08 1974-11-13 Смазка дл гор чей обработки металлов
JP49131534A JPS5937317B2 (ja) 1974-05-08 1974-11-13 高温用滑剤
FR7441870A FR2270319B1 (de) 1974-05-08 1974-12-18
CS753115A CS196268B2 (en) 1974-05-08 1975-05-05 Lubricant for metals hot shaping
CA226,398A CA1054134A (en) 1974-05-08 1975-05-06 High-temperature lubricant for the hot-working of metals
SE7505263A SE412919B (sv) 1974-05-08 1975-05-06 Hogtemperatursmorjmedel och anvendning av detta for varmbearbetning av metaller
DD185861A DD120465A5 (de) 1974-05-08 1975-05-06
RO7582160A RO70139A (ro) 1974-05-08 1975-05-07 Compozitie lubrifianta pentru temperaturi inalte utilizabila pentru fasonarea metalelor la cald
ES437493A ES437493A1 (es) 1974-05-08 1975-05-07 Procedimiento para producir una pelicula entre una pieza de trabajo y la herramienta de conformacion en caliente de me- tales.
PL1975180250A PL101948B1 (pl) 1974-05-08 1975-05-08 A lubricant for hot-forming of metals
SU752175649A SU632305A3 (ru) 1974-05-08 1975-09-30 Концентрат смазки дл гор чей обработки металлов

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH624274A CH596294A5 (en) 1974-05-08 1974-05-08 High temp. lubricants for hot forming of metals

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CH596294A5 true CH596294A5 (en) 1978-03-15

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PL (1) PL101948B1 (de)
SU (1) SU625621A3 (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4665936A (en) * 1984-01-04 1987-05-19 Lonza Ltd. Process for the control of turbidity currents
US4735734A (en) * 1985-10-02 1988-04-05 Lonza Ltd. Process for preparing suspensions of solid lubricants
US5016456A (en) * 1988-03-30 1991-05-21 Lonza Ltd. Process for making hollow billets into tubes
US5042209A (en) * 1988-01-19 1991-08-27 Lonza Ltd. Process for charging a carrier gas stream with a free-flowing material and process for operating the device
US5099667A (en) * 1989-06-16 1992-03-31 Lonza Ltd. System for suspending and applying solid lubricants to tools or work pieces
US5205488A (en) * 1990-03-26 1993-04-27 Lonza Ltd. Process and device for spraying a liquid intermittently, especially a lubricant suspension to be sprayed under high pressure
US5271854A (en) * 1986-09-23 1993-12-21 Lonza Ltd. High temperature lubricant containing carboxylated styrene-butadiene latex
DE102005043542A1 (de) * 2005-09-13 2007-03-15 Graphit Kropfmühl AG Stabile wässrige Graphitdispersion mit hohem Feststoffgehalt
US8307688B2 (en) 2006-05-26 2012-11-13 Sumitomo Metal Industries, Ltd. Process for producing seamless stainless steel pipe

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4665936A (en) * 1984-01-04 1987-05-19 Lonza Ltd. Process for the control of turbidity currents
US4735734A (en) * 1985-10-02 1988-04-05 Lonza Ltd. Process for preparing suspensions of solid lubricants
EP0218989A3 (en) * 1985-10-02 1989-04-26 Lonza Ag Method for suspending solid lubricants
US5271854A (en) * 1986-09-23 1993-12-21 Lonza Ltd. High temperature lubricant containing carboxylated styrene-butadiene latex
US5042209A (en) * 1988-01-19 1991-08-27 Lonza Ltd. Process for charging a carrier gas stream with a free-flowing material and process for operating the device
US5016456A (en) * 1988-03-30 1991-05-21 Lonza Ltd. Process for making hollow billets into tubes
US5099667A (en) * 1989-06-16 1992-03-31 Lonza Ltd. System for suspending and applying solid lubricants to tools or work pieces
US5205488A (en) * 1990-03-26 1993-04-27 Lonza Ltd. Process and device for spraying a liquid intermittently, especially a lubricant suspension to be sprayed under high pressure
DE102005043542A1 (de) * 2005-09-13 2007-03-15 Graphit Kropfmühl AG Stabile wässrige Graphitdispersion mit hohem Feststoffgehalt
US8307688B2 (en) 2006-05-26 2012-11-13 Sumitomo Metal Industries, Ltd. Process for producing seamless stainless steel pipe

Also Published As

Publication number Publication date
PL101948B1 (pl) 1979-02-28
SU625621A3 (ru) 1978-09-25

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