EP0251192A2 - Schmiermittel für die Metallumformung - Google Patents
Schmiermittel für die Metallumformung Download PDFInfo
- Publication number
- EP0251192A2 EP0251192A2 EP87109098A EP87109098A EP0251192A2 EP 0251192 A2 EP0251192 A2 EP 0251192A2 EP 87109098 A EP87109098 A EP 87109098A EP 87109098 A EP87109098 A EP 87109098A EP 0251192 A2 EP0251192 A2 EP 0251192A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- lubricant
- weight
- lubricant according
- thermosetting resin
- resin
- 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.)
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- C10M173/00—Lubricating compositions containing more than 10% water
- C10M173/02—Lubricating compositions containing more than 10% water not containing mineral or fatty oils
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- C10M143/00—Lubricating compositions characterised by the additive being a macromolecular hydrocarbon or such hydrocarbon modified by oxidation
- C10M143/02—Polyethylene
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- C10M143/10—Lubricating compositions characterised by the additive being a macromolecular hydrocarbon or such hydrocarbon modified by oxidation containing aromatic monomer, e.g. styrene
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- 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
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- 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 [having hydrocarbon substituents containing less than thirty carbon atoms]
- C10M2215/082—Amides [having hydrocarbon substituents containing less than thirty carbon atoms] containing hydroxyl groups; Alkoxylated derivatives
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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
- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant Compositions
- C10M2215/24—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant Compositions having hydrocarbon substituents containing thirty or more carbon atoms, e.g. nitrogen derivatives of substituted succinic acid
- C10M2215/26—Amines
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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
- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant Compositions
- C10M2215/24—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant Compositions having hydrocarbon substituents containing thirty or more carbon atoms, e.g. nitrogen derivatives of substituted succinic acid
- C10M2215/28—Amides; Imides
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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
- C10M2217/00—Organic macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2217/02—Macromolecular compounds obtained from nitrogen containing monomers by reactions only involving carbon-to-carbon unsaturated bonds
- C10M2217/024—Macromolecular compounds obtained from nitrogen containing monomers by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to an amido or imido group
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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
- C10M2217/00—Organic macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2217/02—Macromolecular compounds obtained from nitrogen containing monomers by reactions only involving carbon-to-carbon unsaturated bonds
- C10M2217/026—Macromolecular compounds obtained from nitrogen containing monomers by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a nitrile group
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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
- C10M2217/00—Organic macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2217/06—Macromolecular compounds obtained by functionalisation op polymers with a nitrogen containing compound
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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
- C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
- C10M2219/04—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions containing sulfur-to-oxygen bonds, i.e. sulfones, sulfoxides
- C10M2219/044—Sulfonic acids, Derivatives thereof, e.g. neutral salts
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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
- C10M2225/00—Organic macromolecular compounds containing phosphorus as ingredients in lubricant compositions
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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
- C10M2225/00—Organic macromolecular compounds containing phosphorus as ingredients in lubricant compositions
- C10M2225/02—Macromolecular compounds from phosphorus-containg monomers, obtained by reactions involving only 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
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2225/00—Organic macromolecular compounds containing phosphorus as ingredients in lubricant compositions
- C10M2225/04—Organic macromolecular compounds containing phosphorus as ingredients in lubricant compositions obtained by phosphorisation of macromolecualr compounds not containing phosphorus in the monomers
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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
- C10M2225/00—Organic macromolecular compounds containing phosphorus as ingredients in lubricant compositions
- C10M2225/04—Organic macromolecular compounds containing phosphorus as ingredients in lubricant compositions obtained by phosphorisation of macromolecualr compounds not containing phosphorus in the monomers
- C10M2225/041—Hydrocarbon polymers
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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
- C10N2010/00—Metal present as such or in compounds
- C10N2010/04—Groups 2 or 12
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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
- C10N2050/00—Form in which the lubricant is applied to the material being lubricated
- C10N2050/01—Emulsions, colloids, or micelles
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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
- C10N2050/00—Form in which the lubricant is applied to the material being lubricated
- C10N2050/015—Dispersions of solid lubricants
- C10N2050/02—Dispersions of solid lubricants dissolved or suspended in a carrier which subsequently evaporates to leave a lubricant coating
Definitions
- the invention relates to an aqueous lubricant for the cold forming of metals and a method for facilitating the cold forming of metallic workpieces with the aid of this lubricant.
- a lubricant coating in order to reduce the frictional resistance between the metal surface of the workpiece and the forming tool.
- two methods are used for this.
- One is to use lubricants with high pressure additives or viscosity regulators when lower degrees of deformation are required.
- the other provides for a resin-based lubricant film to be applied first from the organic phase and then a lubricating oil if heavy reshaping is intended.
- Lubricant film remaining on the workpiece can be removed in a simple manner, for example with the aid of an alkaline cleaner.
- the object of the invention is to provide a lubricant for the cold forming of metals, with the aid of which even heavy forming can be carried out in a satisfactory manner, which can do without organic solvents and whose residues can be removed in a simple manner after the forming.
- the object is achieved by formulating the aqueous lubricant of the type mentioned at the outset in accordance with the invention in such a way that it contains from 10 to 35% by weight of an acrylic-based thermosetting resin with a glass transition point of from -10 to + 25 ° C 3 to 15% by weight of wax and 0.5 to 5% by weight of surfactant, the weight ratio of thermosetting resin to wax being set to 2 to 12.
- the aqueous lubricant is allowed to air dry, if necessary by additional heating.
- a lubricant which contains a thermosetting resin of the general formula - (Ra-Rb-Rc-Rd) n , where Ra, Rb, Rc, Rd represent different monomers and "n" is the degree of polymerization is 1,000 to 50,000.
- the order of the individual monomers in the resin is irrelevant.
- the value for "n" within the limits of 1,000 and 50,000 should be chosen such that a resin with a glass transition point of - 10 ° C to + 25 ° C results.
- the resin can be prepared by polymerizing a mixture of the monomers at a temperature of 50 to 60 ° C for a period of 5 to 7 hours.
- the monomers can also be polymerized in solution or dispersion.
- solvents other than water such as ethanol or isopropanol, can be used or co-used.
- Rb at least one monomer from the group of an acrylic ester, obtained by reacting acrylic acid with a primary aliphatic alcohol having 1 to 12 carbon atoms, or a methacrylic ester, obtained by reacting methacrylic acid with a primary aliphatic alcohol having 3 to 12 carbon atoms Is atoms and has a share of 20 to 70% by weight of the resin
- Rc is at least one monomer from the group consisting of acrylic acid, methacrylic acid, maleic acid, itaconic acid, 2-hydroxyethyl methacrylate phosphoric acid ester or salts thereof and has a share of 1 to 15% by weight of the resin, - in which Rd is
- Suitable waxes include paraffin wax, animal or vegetable oil, higher fatty acids, higher alcohols, esters of higher fatty acids and higher alcohols, higher fatty acid amides, higher fatty acid amines and the like.
- waxes with a melting point above 45 ° C.
- One way to increase the melting point of the wax is to add hydrogen to double bonds.
- Particularly suitable surfactants are those of the anionic or nonionic type.
- anionic surfactants are sodium alkylnaphthyl sulfonate, sodium alkylbenzenesulfonate and Turkish red oil.
- nonionic surfactants are polyoxyethylene alkyl ethers with the alkyl group of a higher alcohol, polyoxyethylene nonylphenol ether, polyethylene glycol fatty acid esters and sorbitol fatty acid esters.
- the surfactant is particularly responsible for the emulsification or dispersion of the wax in water.
- mechanical stirring can be carried out with the addition of a homogenizing agent.
- aqueous lubricant consists in an additional content of solid lubricant additive.
- solid lubricant additive examples include graphite, molydand disulfide, talc, Teflon, boron nitride, calcium carbonate, melamine, cyanuric acid adducts and the like.
- thermosetting resin based on acrylate arises from the following facts.
- the cold forming of metals generates heat that increases the temperature of the workpiece and tool.
- the heavier the forming the greater the heat development and thus the higher the temperature.
- heat accumulation also occurs.
- thermoplastic resins based on acrylate which soften when heated above the glass transition point and therefore cannot prevent contact between the workpiece and the tool, this contact and consequently corrosion is avoided with certainty with thermosetting resins based on acrylate.
- Thermosetting resins do not have this advantage par excellence. Many resins harden in such a way that they cannot follow the expansion of the workpiece associated with the deformation. As a result, the film of lubricant tears and there is the aforementioned contact between the workpiece and the tool. Many of the thermosetting resins are also no longer easy to remove after forming, e.g. with the help of an alkaline cleaner.
- thermosetting resins based on acrylate with a glass transition point from - 10 ° C to + 25 ° C, the advantages of excellent adhesion on the Metal surface, the flexibility or adaptability to the elongation and the ease of removal of the lubricant film after the forming united.
- the lubricant coating becomes too soft so that it can be removed during the forming process.
- the coating becomes too hard and the adaptability to the elongation of the workpiece is no longer sufficient.
- a lubricant that contains an acrylic-based resin with a glass transition point from 0 to + 5 ° C.
- the monomer amounts Ra - in the amounts specified in each case - are in particular for the hardness and tensile strength, that of Rb in particular for the extensibility, that of Rc in particular for the adhesion to the metal surface and the dispersibility of the resin and that of Rd in particular responsible for an additional improvement in liability.
- the lubricant coating can become too soft, if it exceeds 70% by weight it can become too hard. In both cases, a perfect separation effect for the workpiece / tool is not guaranteed with certainty.
- the proportion of the monomer Rb is below 20% by weight, the glass transition point is increased and the coating formation at room temperature can deteriorate. At a If the proportion exceeds 70% by weight, the hardness of the lubricant coating can become too low.
- the adhesion of the coating can be too low and the removability of the remaining lubricant film with an alkaline cleaner can be impaired (at less than 1% by weight).
- the viscosity of the lubricant can increase significantly, which would make it more difficult to apply, and its hygroscopicity may increase, which would be associated with reduced adhesion due to the absorption of water (at more than 15% by weight).
- the degree of crosslinking can increase so much that the flexibility of the lubricant coating is lost.
- a proportion of 5 to 15% by weight is optimal for the hydroxyalkyl methacrylate, and a proportion of 1 to 5% by weight is optimal for N-methylolacrylamide or glycidyl methacrylate.
- thermosetting resin to wax is important insofar as the adhesion of the lubricant coating decreases when it falls below 2, so that the coating tears. If l2 is exceeded the lubricating effect after.
- the preferred range is 4 to 6.
- surfactant content It is important for the surfactant content that the dispersibility decreases too much when the concentrations are too low and that the lubricity of the coating is impaired when the concentrations are too high.
- anionic or nonionic type surfactants cationic or amphoteric surfactants can also be used.
- the lubricant is applied to the cleaned workpieces by dipping, spraying, brushing, pouring or roller application at room temperature. Then it is dried. The mixture is expediently dried in air, then heated to 80 to 120 ° C. and finally hardened. The procedure improves the adhesion of the lubricant coating.
- the height of the coating weight depends essentially on the intended forming. Among other things, are regulated by the concentration of the lubricant components.
- lubricant coatings with dry weights of 0.5 to 30 g / m 2 can be applied, with which any conventional cold forming can be carried out.
- the coating has excellent adhesion and release properties.
- Frictional heat follows the shape of the workpiece without breaking the film, effectively preventing it from seizing. After the deformation, the remaining lubricant film can be removed in a simple manner using an alkaline cleaner.
- the layer weight produced was within the range from 10 to 15 g / m2.
- the tubes were then drawn on a drawing bench and evaluated for their appearance and the removability of the lubricant film remaining on the surface.
- the tubes were immersed in an alkaline solution at 90 ° C. for a period of 1 hour.
- the solution contained 3% by weight sodium hydroxide, 1.5% by weight sodium tripolyphosphate and surfactant. The degree of removability was assessed visually.
- Sheets of the same steel quality with the dimensions 50 ⁇ 100 ⁇ 0.8 mm were treated with the same lubricants under identical conditions as stated above for the pipes. They were then subjected to the Bauden test to determine the friction coefficient and the sliding number until the occurrence of contact marks.
- Example 1 Steel pipes with the quality and pretreatment as in Example 1 were provided with an oxalate coating using a commercially available oxalation solution (Ferrbond A; 35 g / l, accelerator l6; lg / l from Nihon Parkerizing Co.) (treatment temperature 90 ° C., treatment time 10 min .). After water rinsing the tubes were at 80 ° C for 3 min. treated in a lubricant solution (Bonderlube 235 from Nihon Parkerizing Co; 70 g / l) and dried. Steel sheets were treated in the same way. The tests described in Example 1 were then carried out.
- a commercially available oxalation solution Ferrbond A; 35 g / l, accelerator l6; lg / l from Nihon Parkerizing Co.
- Example 1 Steel pipes of the quality and pretreatment described in Example 1 were min. dipped in a resin diluted with toluene in a ratio of 1: 1 (Hangsterfer III QD from Hangsterfer) and then air-dried for 1 day. The layer weight produced was 10 g / m2. After further application of a lubricating oil (J-1 from Hangsterfer), the tubes were drawn and evaluated as indicated in Example 1. Correspondingly treated sheets were subjected to the Bauden test.
- Example 2 The experiment according to Example 1 was repeated with lubricant 1, but the resin no. l not the networking component Rd (HEMA).
- the layer weight ranged from 10 to 15 g / m2.
- Example 1 The test according to Example 1 was carried out with lubricant no. 3 repeated, but the resin contained No. 3 not the cross-linking component Rd (HPA).
- the lubricant coatings produced with the lubricants according to the invention have excellent lubricating properties. They are significantly better than the lubricant coatings produced using the comparison tests. Furthermore, the lubricant coatings produced according to the invention are far superior to the other lubricant coatings in terms of removability after drawing.
- Table 4 illustrates the better friction coefficient and the higher resistance to seizure phenomena obtained with the coatings according to the invention compared to known coatings.
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- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Lubricants (AREA)
- Paints Or Removers (AREA)
- Forging (AREA)
Abstract
Description
- Die Erfindung betrifft ein wässriges Schmiermittel für die Kaltumformung von Metallen sowie ein Verfahren zur Erleichterung der Kaltumformung von metallischen Werkstücken mit Hilfe dieses Schmiermittels.
- Bei der Kaltumformung ist es üblich, die Werkstücke mit einer Schmiermittelüberzug zu versehen, um dadurch den Reibungswiderstand zwischen Metalloberfläche des Werkstückes und dem Umformungswerkzeug zu verringeren. Hierfür sind im wesentlichen zwei Methoden gebräuchlich. Eine besteht darin, Schmiermittel mit Hochdruckadditiven oder Viskositätsregulatoren einzusetzen, wenn geringere Umformungsgrade gefordert sind. Die andere sieht vor, zunächst aus organischer Phase einen Schmiermittelfilm auf Harzbasis und anschließend ein Schmieröl aufzubringen, wenn schwere Umformungen beabsichtigt sind.
- In jüngerer Zeit nimmt die Verwendung von Schmiermittel für die unterschiedlichsten Zwecke ständig zu. Bei schweren Umformungsbedingungen erfüllen die vorgenannten Schmiermittelsysteme ihre Aufgabe nicht mehr zufriedenstellend. Gewisse Probleme hinsichtlich Umweltschutz und Arbeitsplatzhygiene ergeben sich aus dem häufig vorhandenen Gehalt an organischen Lösungsmitteln. Auch Aspekte der Feuergefährlichkeit spielen eine oft bedeutende Rolle.
- Von weiterer erheblicher Bedeutung bei der Anwendung von Schmiermitteln ist die Frage, ob der nach der Umformung auf dem Werkstück verbliebene Schmiermittelfilm in einfacher Weise, z.B. mit Hilfe eines alkalischen Reinigers, zu entfernen ist.
- Aufgabe der Erfindung ist es, ein Schmiermittel für die Kaltumformung von Metallen bereitzustellen, mit dessen Hilfe auch schwere Umformungen in zufriedenstellender Weise durchführbar sind, das auf organische Lösungsmittel verzichten kann und dessen Rückstände nach der Umformung in einfacher Weise entfernt werden können.
- Die Aufgabe wird gelöst, indem man das wässrige Schmiermittel der eingangs genannten Art entsprechend der Erfindung derart formuliert, daß es einen Gehalt an l0 bis 35 Gew.-% eines wärmehärtbaren Harzes auf Acrylatbasis mit einem Glasübergangspunkt von - l0 bis + 25°C, an 3 bis l5 Gew.-% Wachs und an 0,5 bis 5 Gew.-% Tensid aufweist, wobei das Gewichtsverhältnis von wärmehärtbarem Harz zu Wachs auf 2 bis l2 eingestellt ist.
- Üblicherweise läßt man das wässrige Schmiermittel an der Luft, ggf. durch zusätzliches Erhitzen auftrocknen.
- Gemäß einer bevorzugten Ausgestaltung der Erfindung setzt man ein Schmiermittel ein, daß ein wärmehärtbares Harz der allgemeinen Formel - (Ra-Rb-Rc-Rd) n enthält, wobei Ra, Rb, Rc, Rd unterschiedliche Monomere darstellen und "n" der Polymerisationsgrad mit l.000 bis 50.000 ist.
- Hierbei spielt die Reihenfolge der einzelnen Monomere im Harz keine Rolle. Der Wert für "n" innerhalb der Grenzen von l.000 und 50.000 ist derart zu wählen, daß ein Harz mit einem Glasübergangspunkt von - l0°C bis + 25°C resultiert. Die Herstellung des Harzes kann erfolgen, indem man eine Mischung der Monomeren bei einer Temperatur von 50 bis 60°C für die Dauer von 5 bis 7 Stunden polymerisiert. Die Polymerisation der Monomeren kann auch in Lösung oder Dispersion erfolgen. Je nach Methode können dabei von Wasser verschiedenen Lösungsmittel, z.B. Ethanol oder Isopropanol, verwendet oder mitverwendet werden.
- Weitere vorteilhafte Ausführungsformen der Erfindung bestehen darin, das Schmiermittel mit einem wärmehärtbaren Harz zu formulieren,
- bei dem Ra mindestens ein Monomer aus der Gruppe Vinyltoluol, Styrol, Methylmethacryl und Acrylnitril ist und einen Anteil von 20 bis 70 Gew.-% am Harz hat,
- bei dem Rb mindestens ein Monomer aus der Gruppe eines Acrylesters, erhalten durch Reaktion von Acrylsäure mit einem primären aliphatischen Alkohol mit l bis l2 C-Atomen, oder eines Methacrylesters, erhalten durch Reaktion von Methacrylsäure mit einem primären aliphatischen Alkohol mit 3 bis l2 C-Atomen ist und einen Anteil an 20 bis 70 Gew.-% am Harz hat,
- bei dem Rc mindestens ein Monomer aus der Gruppe Acrylsäure, Methacrylsäure, Maleinsäure, Itaconsäure, 2-Hydroxyethylmethacrylat-Phosphorsäureester bzw. Salzen hiervon ist und einen Anteil von l bis l5 Gew.-% am Harz hat,
- bei dem Rd mindestens ein Monomer aus der Gruppe 2-Hydroxyethylmethacrylat, Hydroxypropylmethacrylat, 2-Hydroxyethylacrylat, Hydroxypropylacrylat, N-Methylolacrylamid oder Ester hiervon, Diacetonacrylamid und Glycidylmethacrylat ist und einen Anteil von l bis 20 Gew.-% am Harz hat. - Geeignete Wachse sind beispielsweise Paraffinwachs, tierisches oder pflanzliches Öl, höhere Fettsäuren, höhere Alkohole, Ester von höheren Fettsäuren und höheren Alkoholen, höhere Fettsäureamide, höhere Fettsäureamine und dergleichen. Damit der Schmiermittelfilm fest bleibt,is es entsprechend einer weiteren vorteilhaften Ausgestaltung zweckmäßig, Wachse mit einem Schmelzpunkt oberhalt 45°C einzusetzen. Eine Möglichkeit, den Schmelzpunkt des Wachses zu erhöhen, besteht in der Wasserstoffanlagerung an Doppelbindungen.
- Als Tensid sind insbesondere solche vom anionischen oder nichtionischen Typ geeignet. Beispiele für anionische Tenside sind Natriumalkylnaphthylsulfonat, Natriumalkylbenzolsulfonat und Türkischrotöl. Beispiele für nichtionische Tenside sind Polyoxyethylenalkylether mit der Alkylgruppe eines höheren Alkohols, Polyoxyethylennonylphenolether, Polyethylenglykol-Fettsäureester und Sorbitol-Fettsäureester.
- Das Tensid ist insbesondere für die Emulgierung bzw. Dispergierung des Wachses in Wasser verantwortlich. Zur weiteren Verbesserung kann mechanisches Rühren unter zusätzlicher Zugabe eines Homogenisierungsmittels erfolgen.
- Eine weitere zweckmäßige Formulierung des wässrigen Schmiermittels besteht in einem zusätzlichen Gehalt an festem Schmiermitteladditiv. Beispiele hierfür sind Graphit, Molydändisulfid, Talk, Teflon, Bornitrid, Kalziumkarbonat, Melamin, Cyanursäureaddukte und dergleichen.
- Der Vorzug der Verwendung eines wärmehärtbaren Harzes auf Acrylatbasis ergibt sich aus folgendem Sachverhalt. Bei der Kaltumformung von Metallen entsteht Wärme, die die Temperatur von Werkstück und Werkzeug erhöht. Je schwerer die Umformung ist, desto größer ist die Wärmeentwicklung und damit die Temperaturerhöhung. Bei kontinuierlicher Umformung tritt zudem eine Wärmeakkumulation auf. Gegenüber thermoplastischen Harzen auf Acrylatbasis, die bei Erwärmung über den Glasübergangspunkt erweichen und dadurch einen Kontakt zwischen Werkstück und Werkzeug nicht verhindern können, wird mit wärmehärtbaren Harzen auf Acrylatbasis dieser Kontakt und infolgedessen ein Anfressen mit Sicherheit vermieden. Diesen Vorteil besitzen wärmehärtbare Harze nicht schlechthin. Viele Harze härten in der Weise aus, daß sie der mit der Umformung verbundenen Ausdehnung des Werkstückes nicht folgen können. Als Folge hiervon reißt der Schmiermittelfilm und es kommt zu dem bereits vorstehend erwähnten Kontakt zwischen Werkstück und Werkzeug. Viele der wärmehärtbaren Harze sind nach der Umformung auch nicht mehr einfach zu entfernen, z.B. mit Hilfe eines alkalischen Reinigers.
- Überraschenderweise sind in den wärmehärtbaren Harzen auf Acrylatbasis mit einem Glasübergangspunkt von - l0°C bis + 25°C die Vorteile der hervorragenden Haftung auf der Metalloberfläche, die Flexibilität bzw. Anpaßbarkeit an die Dehnung und die leichte Entfernbarkeit des Schmiermittelfilms nach der Umformung vereinigt. Bei einem Glasübergangspunkt unter - l0°C wird der Schmiermittelüberzug zu weich, so daß er bei der Umformung entfernt werden kann. Bei Werten oberhalb + 25°C wird der Überzug zu hart und die Anpaßbarkeit an die Dehnung des Werkstückes ist nicht mehr in ausreichendem Maße gegeben.
- Insoweit werden die günstigsten Ergebnisse erzielt, wenn man ein Schmiermittel einsetzt, das ein Harz auf Acrylatbasis mit einem Glasübergangspunkt von 0 bis +5°C enthält.
- Wie umfangreiche Untersuchungen ergeben haben, sind - in den jeweils angegebenen Mengen - der Monomeranteil Ra insbesondere für die Härte und Dehnungsfestigkeit, der von Rb insbesondere für die Dehnbarkeit, der von Rc insbesondere für die Haftung auf der Metalloberfläche und die Dispergierbarkeit des Harzes und der von Rd insbesondere für eine zusätzliche Haftungsverbesserung verantwortlich.
- Wird der Anteil des Monomers Ra von 20 Gew.-% unterschritten, kann der Schmiermittelüberzug zu weich, beim Überschreiten von 70 Gew.-% zu hart werden. In beiden Fällen ist eine einwandfreie Trennwirkung für Werkstück/Werkzeug nicht mit Sicherheit gewährleistet.
- Gelangt der Anteil des Monomers Rb unter 20 Gew.-% wird der Glasübergangspunkt erhöht und die Überzugsausbildung bei Raumtemperatur kann sich verschlechtern. Bei einem Anteil über 70 Gew.-% kann die Härte des Schmiermittelüberzugs zu gering werden.
- Die Wirkung der Anteile der Monomere Ra und Rb ist weitgehend gegenläufig, so daß es auf deren Ausgewogenheit ankommt.
- Bei einem Anteil des Monomers Rc außerhalb der vorgeschriebenen Grenzen kann die Haftung des Überzuges zu gering und die Entfernbarkeit des verbliebenen Schmiermittelfilms mit einem alkalischen Reiniger verschlechtert werden (bei unter l Gew.-%). Auf der anderen Seite kann die Viskosität des Schmiermittels stark ansteigen, wodurch dessen Applikation erschwert würde, und dessen Hygroskopizität steigen, was wegen der Wasseraufnahme mit einer verminderten Haftung verbunden wäre (bei mehr als l5 Gew.-%)-
- Sofern der Monomeranteil von Rd ünter l Gew.-% sinkt, kann die Vernetzung des Harzes unbefriedigend werden, wodurch der Widerstand bei Wärmeeinwirkung absinken könnte. Bei Werten über 20 Gew.-% kann der Grad der Vernetzung so stark ansteigen, daß die Flexibilität des Schmiermittelüberzuges verloren geht. Für das Hydroxyalkylmethacrylat ist ein Anteil von 5 bis l5 Gew.-%, für N-Methylolacrylamid oder Glycidylmethacrylat ein solcher von l bis 5 Gew.-% optimal.
- Das Gewichtsverhältnis von wärmehärtbarem Harz zu Wachs ist insofern von Bedeutung, als bei einem Unterschreiten von 2 die Haftung des Schmiermittelüberzuges nachläßt,so daß der Überzug reißt. Bei einem Überschreiten von l2 läßt die Schmierwirkung nach. Der bevorzugte Bereich liegt in den Grenzen von 4 bis 6.
- Für den Tensidgehalt ist wesentlich, daß bei zu geringen Konzentrationen das Dispergiervermögen zu stark zurückgeht, und daß bei zu hohen Konzentrationen das Schmiervermögen des Überzuges beeinträchtigt wird. Neben den bevorzugten Tensiden vom anionischen oder nichtionischen Typ können auch kationische oder amphotere Tenside verwendet werden.
- Die Applikation des Schmiermittels erfolgt auf die gereinigten Werkstücke durch Tauchen, Spritzen, Bürsten, Übergießen oder Rollenauftrag bei Raumtemperatur. Dann wird getrocknet. Zweckmäßigerweise wird an der Luft getrocknet, dann auf 80 bis l20°C erhitzt und schließlich gehärtet. Durch die Verfahrensweise wird die Haftung des Schmiermittelüberzuges verbessert. Die Höhe des Überzugsgewichtes richtet sich im wesentlichen nach der vorgesehenen Umformung. Sie kann u.a. durch die Konzentration der Schmiermittelkomponenten geregelt werden.
- Bei geringen Umformungsgraden sind 0,5 bis 5 g/m², bei starken Umformungsgraden 5 bis 30 g/m² vorteilhaft (als trockener Überzug angegeben).
- Mit Hilfe der Erfindung können Schmiermittelüberzüge mit Trockengewichten von 0,5 bis 30 g/m² aufgebracht werden, mit denen jede übliche Kaltumformung durchführbar ist. Der Überzug besitzt eine hervorragende Haftung und Trennwirkung. Bei Erwärmung des Überzuges auf l00 bis l50°C als Folge der gebildeten Umformungs- und Reibungswärme folgt er ohne Filmbruch der sich bildenden Form des Werkstückes und verhindert dadurch wirksam ein Anfressen. Nach der Verformung kann der restliche Schmiermitte lfilm in einfacher Weise mit Hilfe eines alkalischen Reinigers entfernt werden.
- Die Erfindung wird anhand der folgenden Beispiele beispielsweise und näher erläutert.
- Rohre aus Edelstahl der Qualität SUS 304, gebeizt und wassergespült, wurden mit verschiedenen Schmiermitteln bei 20°C für die Dauer von l min. im Tauchen behandelt. Die in den Schmiermitteln enthaltenen Komponenten hinsichtlich wärmehärtbares Harz und Wachs sind in den nachfolgenden Tabellen l und 2 näher beschrieben.
- Nach Trocknung an der Luft während einer Stunde erfolgte eine weitere Trocknung mit l00°C heißer Luft während 30 min. Das erzeugte Schichtgewicht lag innerhalb des Bereiches von l0 bis l5 g/m². Die Rohre wurden dann auf einer Ziehbank gezogen und bezüglich ihres Aussehens und der Entfernbarkeit des auf der Oberfläche verbliebenen Schmiermittelfilms bewertet.
-
- Zur Ermittlung der Entfernbarkeit des nach dem Ziehen verbleibenden Schmiermittelfilmes wurden die Rohre in eine alkalische Lösung von 90°C für die Dauer von l Stunde getaucht. Die Lösung enthielt 3 Gew.-% Natriumhydroxid, l,5 Gew.-% Natriumtripolyphosphat und Tensid. Der Grad der Entfernbarkeit wurde visuell bewertet.
- Die Ergebnisse sind in Tabelle 3 angegeben.
- Bleche der gleichen Stahlqualität mit den Abmessungen 50 × l00 × 0,8 mm wurden mit den gleichen Schmiermitteln unter identischen Bedingungen, wie vorstehend für die Rohre angegeben, behandelt. Sie wurden dann dem Bauden-Test zur Bestimmung des Friktionskoeffizienten und der Gleitzahl bis zum Auftreten von Anfreß-Marken unterworfen.
- Die Testergebnisse sind in Tabelle 4 niedergelegt.
- Stahlrohre mit der Qualität und Vorbehandlung wie in Beispiel l wurden mit Hilfe einer handelsüblichen Oxalatierungslösung (Ferrbond A; 35 g/l, Beschleuniger l6; l g/l der Nihon Parkerizing Co.) mit einem Oxalatüberzug versehen (Behandlungstemperatur 90°C, Behandlungsdauer l0 min.). Nach Wasserspülung wurden die Rohre bei 80°C während 3 min. in einer Schmiermittellösung (Bonderlube 235 der Nihon Parkerizing Co; 70 g/l) behandelt und getrocknet. In gleicher Weise wurden Stahlbleche behandelt. Anschließend wurden die in Beispiel l beschriebenen Tests durchgeführt.
- Die Tabellen 3 und 4 enthalten die Ergebnisse.
- Stahlrohre der in Beispiel l beschriebenen Qualität und Vorbehandlung wurden bei Raumtemperatur l min. in ein im Verhältnis l:l mit Toluol verdünntes Harz getaucht (Hangsterfer lll QD der Fa. Hangsterfer) und dann l Tag an der Luft getrocknet. Das erzeugte Schichtgewicht betrug l0 g/m². Nach weiterer Applikaton eines Schmieröls (J-l der Fa. Hangsterfer) wurden die Rohre wie in Beispiel l angegeben gezogen und bewertet. Entsprechend behandelte Bleche wurden dem Bauden-Test unterworfen.
- Die Testergebnisse sind in den Tabellen 3 und 4 niedergelegt.
- Es wurde der Versuch gemäß Beispiel l mit Schmiermittel l wiederholt, jedoch enthielt das darin gelöste Harz No. l nicht die Vernetzungskomponente Rd (HEMA). Das Schichtgewicht lag im Bereich von l0 bis l5 g/m².
- Die für Rohre und Bleche erhaltenen Testergebnisse sind wiederum in den Tabellen 3 und 4 wiedergegeben.
- Es wurde der Versuch gemäß Beispiel l mit dem Schmiermittel No. 3 wiederholt, jedoch enthielt das Harz No. 3 nicht die vernetzende Komponente Rd (HPA).
-
- Wie Tabelle 3 zeigt, besitzen die mit den erfindungsgemäßen Schmiermitteln erzeugten Schmiermittelüberzüge hervorragende Schmiereigenschaften. Sie sind deutlich besser als die mit Hilfe der Vergleichsversuche hergestellten Schmiermittelüberzüge. Weiterhin sind die nach der Erfindung erzeugten Schmiermittelüberzüge hinsichtlich der Entfernbarkeit nach dem Ziehen den anderen Schmiermittelüberzügen weit überlegen.
- Im Hinblick auf den Bauden-Test veranschaulicht Tabelle 4 den besseren Friktionskoeffizient und den höheren Widerstand gegenüber Anfreß-Erscheinungen, die mit den Überzügen gemäß Erfindung im Vergleich zu bekannten Überzügen erhalten wurden.
Claims (11)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT87109098T ATE75770T1 (de) | 1986-06-27 | 1987-06-24 | Schmiermittel fuer die metallumformung. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61151178A JPS638489A (ja) | 1986-06-27 | 1986-06-27 | 金属の冷間加工用潤滑剤 |
| JP151178/86 | 1986-06-27 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0251192A2 true EP0251192A2 (de) | 1988-01-07 |
| EP0251192A3 EP0251192A3 (en) | 1988-05-04 |
| EP0251192B1 EP0251192B1 (de) | 1992-05-06 |
Family
ID=15513003
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP87109098A Expired - Lifetime EP0251192B1 (de) | 1986-06-27 | 1987-06-24 | Schmiermittel für die Metallumformung |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0251192B1 (de) |
| JP (1) | JPS638489A (de) |
| AT (1) | ATE75770T1 (de) |
| DE (2) | DE3778764D1 (de) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0398153A1 (de) * | 1989-05-18 | 1990-11-22 | Röhm Gmbh | Wässrige Funktionsflüssigkeiten enthaltend Verdickungsmittel auf Poly(meth)acrylat-Basis |
| WO1992016603A1 (en) * | 1991-03-22 | 1992-10-01 | Henkel Corporation | Lubrication for cold forming of metals |
| EP0718396A1 (de) * | 1994-12-22 | 1996-06-26 | Metallgesellschaft Ag | Schmiermittel für die Metallumformung |
| US6899770B1 (en) | 1999-03-04 | 2005-05-31 | Henkel Corporation | Composition and process for treating metal surfaces |
| US7696136B2 (en) | 2004-03-11 | 2010-04-13 | Crompton Corporation | Lubricant compositions containing hydroxy carboxylic acid and hydroxy polycarboxylic acid esters |
| US8864916B2 (en) * | 2002-12-13 | 2014-10-21 | Henkel Ag & Co. Kgaa | Method for coating metal substrates with a radically polymerizable coating agent and coated substrates |
| CN110144255A (zh) * | 2019-04-30 | 2019-08-20 | 厦门加美石油集团有限公司 | 一种易清洗冷镦成型油及其制备方法 |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5547595A (en) * | 1995-02-07 | 1996-08-20 | Henkel Corporation | Aqueous lubricant and process for cold forming metal, particularly pointing thick-walled metal tubes |
| US6432886B1 (en) | 1999-09-08 | 2002-08-13 | Mary R. Reidmeyer | Agglomerated lubricant |
| US6291407B1 (en) | 1999-09-08 | 2001-09-18 | Lafrance Manufacturing Co. | Agglomerated die casting lubricant |
| CN101993770B (zh) * | 2010-11-18 | 2013-08-21 | 江南大学 | 一种用于高速拉丝的润滑剂及其制备方法 |
| JP2015183150A (ja) * | 2014-03-26 | 2015-10-22 | 貴和化学薬品株式会社 | 塑性加工用潤滑剤 |
| CN112588846A (zh) * | 2020-11-23 | 2021-04-02 | 江阴法尔胜泓昇不锈钢制品有限公司 | 一种冷镦用合金钢丝的生产工艺 |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5234704B2 (de) * | 1972-09-01 | 1977-09-05 | ||
| JPS5337817B2 (de) * | 1974-07-08 | 1978-10-12 | ||
| US4474669A (en) * | 1980-06-02 | 1984-10-02 | United States Steel Corporation | Can-making lubricant |
| US4403490A (en) * | 1981-06-24 | 1983-09-13 | E/M Lubricants, Inc. | Metal forming lubricant and method of use thereof |
| JPS6160792A (ja) * | 1984-08-31 | 1986-03-28 | Nippon Kokan Kk <Nkk> | 鋼板用冷間圧延油 |
| JPS6187795A (ja) * | 1984-09-19 | 1986-05-06 | Kobe Steel Ltd | 金属管の冷間加工用潤滑剤 |
-
1986
- 1986-06-27 JP JP61151178A patent/JPS638489A/ja active Granted
-
1987
- 1987-06-24 EP EP87109098A patent/EP0251192B1/de not_active Expired - Lifetime
- 1987-06-24 AT AT87109098T patent/ATE75770T1/de not_active IP Right Cessation
- 1987-06-24 DE DE8787109098T patent/DE3778764D1/de not_active Expired - Lifetime
- 1987-06-24 DE DE19873720841 patent/DE3720841A1/de not_active Withdrawn
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0398153A1 (de) * | 1989-05-18 | 1990-11-22 | Röhm Gmbh | Wässrige Funktionsflüssigkeiten enthaltend Verdickungsmittel auf Poly(meth)acrylat-Basis |
| WO1992016603A1 (en) * | 1991-03-22 | 1992-10-01 | Henkel Corporation | Lubrication for cold forming of metals |
| EP0718396A1 (de) * | 1994-12-22 | 1996-06-26 | Metallgesellschaft Ag | Schmiermittel für die Metallumformung |
| US6034041A (en) * | 1994-12-22 | 2000-03-07 | Metallgesellschaft Aktiengesellschaft | Lubricant for metal forming |
| US6899770B1 (en) | 1999-03-04 | 2005-05-31 | Henkel Corporation | Composition and process for treating metal surfaces |
| US8864916B2 (en) * | 2002-12-13 | 2014-10-21 | Henkel Ag & Co. Kgaa | Method for coating metal substrates with a radically polymerizable coating agent and coated substrates |
| US7696136B2 (en) | 2004-03-11 | 2010-04-13 | Crompton Corporation | Lubricant compositions containing hydroxy carboxylic acid and hydroxy polycarboxylic acid esters |
| CN110144255A (zh) * | 2019-04-30 | 2019-08-20 | 厦门加美石油集团有限公司 | 一种易清洗冷镦成型油及其制备方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0437878B2 (de) | 1992-06-22 |
| JPS638489A (ja) | 1988-01-14 |
| ATE75770T1 (de) | 1992-05-15 |
| DE3720841A1 (de) | 1988-01-14 |
| EP0251192A3 (en) | 1988-05-04 |
| EP0251192B1 (de) | 1992-05-06 |
| DE3778764D1 (de) | 1992-06-11 |
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