EP2369020B1 - Verfahren zur Behandlung eines Metallelements für ein Automobil - Google Patents

Verfahren zur Behandlung eines Metallelements für ein Automobil Download PDF

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Publication number
EP2369020B1
EP2369020B1 EP10156581.0A EP10156581A EP2369020B1 EP 2369020 B1 EP2369020 B1 EP 2369020B1 EP 10156581 A EP10156581 A EP 10156581A EP 2369020 B1 EP2369020 B1 EP 2369020B1
Authority
EP
European Patent Office
Prior art keywords
metal element
treating
ultrasonic
hardening
process step
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.)
Not-in-force
Application number
EP10156581.0A
Other languages
English (en)
French (fr)
Other versions
EP2369020A1 (de
Inventor
Leonid Levinski
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.)
THERMISSION AG
Original Assignee
Thermission 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 Thermission AG filed Critical Thermission AG
Priority to EP10156581.0A priority Critical patent/EP2369020B1/de
Publication of EP2369020A1 publication Critical patent/EP2369020A1/de
Application granted granted Critical
Publication of EP2369020B1 publication Critical patent/EP2369020B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62—Quenching devices
    • C21D1/673—Quenching devices for die quenching

Definitions

  • the invention refers to a method for treating a metal element for an automobile.
  • a metal element can be a component of the automobile body or automobile frame made out of a metal sheet as well as a massive metal element of the automobile, such as a bolt, a spring or another massive component not made out of a metal sheet.
  • the metal element has to have a high strength and good anti-corrosive qualities.
  • the metal element is heated in an oven to a temperature of 550°C to 1200°C, and is subsequently quickly cooled down to a temperature below 220°C in an oil bath or by cooled air.
  • the metal element is heated to a temperature of 800°C to 1000°C and is formed into its end shape by pressing and cooled in a press subsequent to the heating.
  • the hardened metal element has a very high strength and allows to produce relatively light metal elements for the automobile. Subsequent to the hardening, the hardened high strength metal element is made anti-corrosive by means of a surface treatment or a surface coating step.
  • the heated metal element On the way from the hardening oven to the oil bath or to the press, the heated metal element is, because the high temperature difference with the environment, subject to scaling so that the scale has to be removed from the metal element before the metal element is passed to the surface treatment or surface coating step.
  • a classic method for scale removing is pickling in a cleaning liquid with a strong acid, for example with sulphuric acid. With this scale removing method, even the smallest structures, such as slits, hollow spaces, undercuts etc. are removed from scale. But using a strong acid has the disadvantage that the treated high strength metal element becomes brittle.
  • An alternative method for scale removing is shot blasting which does not effect the inner structure of the metal element but is not suitable to remove scale from small structures, slits, undercuts etc. In addition, the shot blasting stream can mechanically deform a sheet-made metal element.
  • US 2006/02019334 A1 discloses a cleaning of a press-hardened component blank by dry-cleaning prior to the coating step.
  • US 2006/0131185 A1 discloses a treatment of gears hardened by heat treating techniques in an ultrasound bath for cleaning and dehydration.
  • the metal element is first hardened.
  • the hardening step can be accomplished by heating the metal element in an oven to a temperature of about 550°C to 1200°C. After heating, the metal element is quickly cooled down to a temperature below 200°C in an oil bath or by cooled air. On the way from the heating oven to the oil bath or to a press for providing a press-hardening step, the metal element is subject to scaling.
  • the scale removing step is provided by an ultrasonic process, whereby the ultrasonic liquid is a water solution with an organic carboxylic with the concentration of 0,1 to 10 vol.%.
  • the metal element is coated in a coating process with an anticorrosion coating.
  • This coating process can be realized, for example, by a so-called thermo diffusion process with zinc powder.
  • the organic carboxylic acid concentration is between 1,0 and 6,0 vol.%, and preferably between 2,0 and 6,0 vol.%.
  • the organic carboxylic acid is a citric acid.
  • the ultrasonic liquid has a pH value between 3,0 and 5,0.
  • the ultrasonic frequency during the ultrasonic cleaning sequence is between 18 kHz and 60 kHz, whereby the ultrasonic frequency can be a varied during the complete ultrasonic scale removing sequence.
  • the ultrasonic activity is provided in intervals with numerous interruptions of less than 30% during the ultrasonic process step.
  • the scale removing sequence can take between one and eight minutes.
  • the temperature of the ultrasonic liquid is between 30 and 70°C. In this temperature range, the ultrasonic liquid is very effective.
  • the metal element is moved with respect to the ultrasonic liquid during the ultrasonic cleaning sequence.
  • the metal element is rotated in the ultrasonic liquid during the ultrasonic treatment.
  • the metal element is rotated by a rotor in the ultrasonic liquid during the ultrasonic treatment.
  • the rotor holds the metal element in a rotor cradle or with rotor fingers attached to the metal element.
  • the metal element is a complex structural automobile element.
  • a metal element to be treated can be any metal automobile component which has to have high strength and good anticorrosive qualities. Especially automobile components made out of thin metal sheets but also massive parts as springs and bolts are predestinated to be treated accordingly.
  • the following example refers to a sheet-like metal element which is formed to a component of the automobile body or automobile frame.
  • the metal sheet element is transferred to a hardening oven wherein the metal sheet element is heated to a temperature of 700°C to 1000°C in an oven, and subsequently is formed into its end shape by pressing under high pressure in a press-hardening press. As soon as the heated metal sheet element is removed from the oven, the metal sheet element is subject to scaling on the way to the press so that the metal sheet element is covered with a layer of scale after leaving the press-hardening oven. After the press-hardening step in the press, the press is opened, and the metal sheet element is removed from the press.
  • the scale layer Before the metal sheet element is transferred to a coating step for coating the high strength metal sheet element with an anticorrosion coating, the scale layer has to be removed from the metal sheet element.
  • the scale removing step is carried out in a scale removing device, wherein the high strength metal sheet element is fixed to a rotor which rotates the metal sheet element in an ultrasonic liquid.
  • the ultrasonic liquid is a water solution with an organic carboxylic acid with a concentration of about 4,0 vol%.
  • the acid is a citric acid.
  • the ultrasonic liquid has a temperature of about 50°C and a pH value of 4.
  • an ultrasonic element induces ultrasonic waves into the ultrasonic liquid.
  • the frequency of the ultrasonic waves varies between 20 kHz and 40 kHz, and is provided in intervals of for example 50 seconds separated by interruptions of 10 seconds.
  • the metal sheet element is rotated by the rotor in the ultrasonic liquid. The ultrasonic treatment of one metal sheet element takes about 5 minutes in total.
  • the metal sheet element is removed from the ultrasonic scale removing device, and is transferred to a coating process step whereby the metal sheet element is provided with an anticorrosion treatment by a so-called thermo diffusion process with zinc powder.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Chemical Treatment Of Metals (AREA)

Claims (17)

  1. Verfahren zum Behandeln eines Metallelements für ein Automobil mit den Schritten:
    Härten des Metallelements,
    Entzundern des gehärteten Metallelements in einer Ultraschall-Flüssigkeit mit einem Ultraschallverfahren, wobei die Ultraschall-Flüssigkeit eine wässrige Lösung mit einer organischen Carbonsäure in einer Konzentration von 0,1 bis 10 Vol.-% ist, und
    Beschichten des Metallelements mit einer Korrosionsschutzschicht in einem Beschichtungsverfahren.
  2. Verfahren zum Behandeln eines Metallelements nach Anspruch 1, wobei der Härtungsschritt durch Presshärten durchgeführt wird.
  3. Verfahren zum Behandeln eines Metallelements nach einem der vorhergehenden Ansprüche, wobei die Konzentration der organischen Carbonsäure zwischen 1,0 und 8,0 Vol.-% beträgt.
  4. Verfahren zum Behandeln eines Metallelements nach einem der vorhergehenden Ansprüche, wobei die Konzentration der organischen Carbonsäure zwischen 2,0 und 6,0 Vol.-% beträgt.
  5. Verfahren zum Behandeln eines Metallelements nach einem der vorhergehenden Ansprüche, wobei die organische Carbonsäure eine Zitronensäure ist.
  6. Verfahren zum Behandeln eines Metallelements nach einem der vorhergehenden Ansprüche, wobei die Ultraschall-Flüssigkeit einen pH-Wert zwischen 3,0 und 5,0 hat.
  7. Verfahren zum Behandeln eines Metallelements nach einem der vorhergehenden Ansprüche, wobei die Ultraschallfrequenz während des Ultraschallverfahrensschritts zwischen 18 kHz und 60 kHz beträgt.
  8. Verfahren zum Behandeln eines Metallelements nach einem der vorhergehenden Ansprüche, wobei die Ultraschallfrequenz während des gesamten Ultraschallverfahrensschritts verändert wird.
  9. Verfahren zum Behandeln eines Metallelements nach einem der vorhergehenden Ansprüche, wobei die Ultraschallaktivität in Intervallen mit zahlreichen Unterbrechungen von weniger als 30% während des Ultraschallverfahrensschritts bereitgestellt wird.
  10. Verfahren zum Behandeln eines Metallelements nach einem der vorhergehenden Ansprüche, wobei die Reinigungssequenz 1 bis 8 Minuten dauert.
  11. Verfahren zum Behandeln eines Metallelements nach einem der vorhergehenden Ansprüche, wobei die Temperatur der Ultraschallflüssigkeit zwischen +30 und +70°C beträgt.
  12. Verfahren zum Behandeln eines Metallelements nach einem der vorhergehenden Ansprüche, wobei das Metallelement während des Ultraschallverfahrensschritts in Bezug auf die Ultraschallflüssigkeit bewegt wird.
  13. Verfahren zum Behandeln eines Metallelements nach einem der vorhergehenden Ansprüche, wobei das Metallelement während des Ultraschallverfahrens in der Ultraschallflüssigkeit gedreht wird.
  14. Verfahren zum Behandeln eines Metallelements nach einem der vorhergehenden Ansprüche, wobei das Metallelement während des Ultraschallverfahrens durch einen Rotor in der Ultraschallflüssigkeit gedreht wird.
  15. Verfahren zum Behandeln eines Metallelements nach einem der vorhergehenden Ansprüche, wobei das Metallelement ein komplexes Automobilstrukturelement ist, welches durch Presshärten gehärtet wird.
  16. Verfahren zum Behandeln eines Metallelements nach einem der vorhergehenden Ansprüche, wobei das Metallelement ein massives Element ist, welches durch Erwärmen und anschließendes Abkühlen in einem Ölbad gehärtet wird.
  17. Verfahren zum Behandeln eines Metallelements nach einem der vorhergehenden Ansprüche, wobei die Beschichtung durch ein Thermodiffusionsverfahren mit Zinkpulver verwirklicht wird.
EP10156581.0A 2010-03-16 2010-03-16 Verfahren zur Behandlung eines Metallelements für ein Automobil Not-in-force EP2369020B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP10156581.0A EP2369020B1 (de) 2010-03-16 2010-03-16 Verfahren zur Behandlung eines Metallelements für ein Automobil

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP10156581.0A EP2369020B1 (de) 2010-03-16 2010-03-16 Verfahren zur Behandlung eines Metallelements für ein Automobil

Publications (2)

Publication Number Publication Date
EP2369020A1 EP2369020A1 (de) 2011-09-28
EP2369020B1 true EP2369020B1 (de) 2016-10-05

Family

ID=42332490

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10156581.0A Not-in-force EP2369020B1 (de) 2010-03-16 2010-03-16 Verfahren zur Behandlung eines Metallelements für ein Automobil

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EP (1) EP2369020B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3045567B1 (de) * 2015-01-16 2022-08-31 Eural Gnutti S.p.A. Verfahren für die herstellung und das beizen von aluminiumbarren
CH713079A1 (de) 2016-10-26 2018-04-30 Thermission Ag Verfahren für die Aufbringung einer Schichtstruktur durch Thermodiffusion auf eine metallische oder intermetallische Oberfläche.

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4401479A (en) * 1981-03-12 1983-08-30 Quick Nathaniel R Apparatus and method for processing wire stand cable for use in prestressed concrete structures
US6277799B1 (en) * 1999-06-25 2001-08-21 International Business Machines Corporation Aqueous cleaning of paste residue
DE19957276A1 (de) * 1999-11-29 2001-10-11 Abb Research Ltd Additionsvernetzende Siliconkautschukmischungen
US7998289B2 (en) * 2002-09-13 2011-08-16 Daimler Ag Press-hardened part and method for the production thereof
DE10333165A1 (de) * 2003-07-22 2005-02-24 Daimlerchrysler Ag Pressgehärtetes Bauteil und Verfahren zur Herstellung eines pressgehärteten Bauteils
US7439654B2 (en) * 2004-02-24 2008-10-21 Air Products And Chemicals, Inc. Transmission of ultrasonic energy into pressurized fluids
US7138066B2 (en) * 2004-12-16 2006-11-21 Gm Global Technology Operations, Inc. Gear surface treatment procedure
JP5269330B2 (ja) * 2007-03-12 2013-08-21 株式会社Ａｄｅｋａ 金型用洗浄剤組成物及び金型の洗浄方法

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