EP1745158B1 - Procede pour traiter une surface - Google Patents

Procede pour traiter une surface Download PDF

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Publication number
EP1745158B1
EP1745158B1 EP05716985A EP05716985A EP1745158B1 EP 1745158 B1 EP1745158 B1 EP 1745158B1 EP 05716985 A EP05716985 A EP 05716985A EP 05716985 A EP05716985 A EP 05716985A EP 1745158 B1 EP1745158 B1 EP 1745158B1
Authority
EP
European Patent Office
Prior art keywords
nitriding
cold
component
nitrocarburization
metallic surface
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 - Fee Related
Application number
EP05716985A
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German (de)
English (en)
Other versions
EP1745158A1 (fr
Inventor
Rolf Zeller
Nils Lippmann
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.)
Robert Bosch GmbH
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Robert Bosch GmbH
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Filing date
Publication date
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Publication of EP1745158A1 publication Critical patent/EP1745158A1/fr
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Publication of EP1745158B1 publication Critical patent/EP1745158B1/fr
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/04—Treatment of selected surface areas, e.g. using masks

Definitions

  • the invention relates to a method for the treatment of a metallic surface and its use according to the preamble of the independent claims.
  • Nitriding produces hard surface layers which increase the hardness, wear resistance and fatigue strength of the metallic surface.
  • a first possibility for nitriding metallic ear surfaces is to subject the corresponding surface to a so-called gas nitriding.
  • a workpiece is heated in a nitriding in a first step to a temperature of about 400 ° C. This heating is preferably carried out under an ammonia atmosphere. Thereafter, in a second step, the workpiece is heated to a nitriding temperature which is approximately between 500 ° C and 600 ° C.
  • the actual nitriding of the workpiece takes place in an atmosphere of ammonia and an oxidizing agent, an atmosphere of ammonia and a carbon carrier or in a pure ammonia atmosphere.
  • nitriding metallic surfaces is the so-called plasma nitriding.
  • the workpiece is exposed to a gas mixture at an elevated temperature, the nitration being assisted by the action of a plasma.
  • a plasma nitriding is for example the DE 100 56 842 A1 refer to.
  • nitrided component surfaces can only be processed to a limited extent after a nitriding treatment.
  • nitriding often involves partial heat treatment.
  • areas which are to be mechanically processed at a later time and thus should not be nitrided are covered locally. This is done, for example, in gas nitriding by the previous application of corresponding pastes, whereby an interaction of the nitrogen-containing atmosphere is prevented with the covered surface areas.
  • plasma nitriding a masking of the surface areas which are not to be nitrided is undertaken, which avoids the occurrence of a smoldering seam on the masked component surface and thus prevents the generation of reactive nitrogen.
  • both methods for covering non-nitriding surface areas are limited to small surface areas and, in particular in plasma nitriding, only areas with low geometric complexity can be effectively masked.
  • a coating method for applying a metallic coating.
  • a certain geometry of the metallic coating can be produced by pretreating certain areas by sandblasting in order to prevent a coating here.
  • Object of the present invention is to provide a method for the treatment of metallic surfaces, wherein during the implementation of a nitration or Nitrocarburiervons nitriding or nitrocarburizing predetermined surface areas is prevented.
  • the inventive method with the characterizing features of claim 1 has the advantage that in a simple and cost-effective manner certain areas to nitriding surface can be effectively removed from the action of a nitriding or Nitrocarburier opposition so that they are accessible to subsequent mechanical processing. For this purpose, those areas of the metallic surface which are not to be nitrided or nitrocarburized are subjected to cold working before carrying out the nitriding or nitrocarburizing process.
  • the surface areas pretreated in this way can then be subjected to both gas and plasma nitriding without further covering. This allows the partial treatment of component surfaces with high geometric complexity. Another advantage is that a cold deformation can be easily automated and thus carried out inexpensively. In addition, contamination of the components or furnace systems is prevented by paste residues.
  • the cold forming is shot blasting, embossing or rolling over, since these cold forming processes are effective and yet can be easily performed.
  • FIG. 1 shows a flow chart of the method according to the invention
  • FIG. 2 a plot of the hardness of a Vickers surface cold-worked before the nitriding process over the distance of the measuring point from the component surface
  • FIG. 3 For comparison, a plot of the hardness of a Vickers non-cold-worked surface before nitriding versus the distance of the measuring point from the component surface according to FIG DE 100 56 842 A1
  • FIG. 4 a microsection of a according to the inventive method before the nitriding cold-formed component surface after the nitriding process.
  • FIG. 1 a flow chart of the method according to the invention is shown according to a first embodiment.
  • the component 10 in a first step, is partially subjected to a cold deformation 12, wherein as a cold forming shot peening, embossing or rolling over can be performed. Thereafter, the component 10a on the surface of the cold-formed regions 14. The cold forming process alters the crystalline structure of the steel to prevent nitrogen from diffusing.
  • the nitriding 16 of the component surface takes place.
  • the resulting component 10b which is shown in the form of a longitudinal section along the line AA of the component 10a, has a nitrogen-containing diffusion layer 18, wherein the previously cold-formed regions 14 are resistant to an action of the nitriding process and no nitrogen-containing diffusion layer of any kind exhibit.
  • a hardness distribution of the cold-worked portions 14 after the nitriding process is in FIG. 2 shown. It can be seen that the measured hardness according to Vickers practically does not change independently of the distance of the measuring point to the component surface. This is an indication that no nitrogen-containing diffusion layer has formed during the nitriding process in the region of the cold-formed regions 14.
  • FIG. 3 the measured hardness of a component surface has been subjected to a nitriding process according to the prior art without prior cold deformation. It can be seen that the Vickers hardness increases sharply, in particular in an edge region of 0.1 mm at the component surface, and thus it can be concluded that a nitrogen-containing diffusion layer exists.
  • FIG. 4 Furthermore, a micrograph of the component surface in the region of the cold-formed surface regions 14 after nitriding is shown in thousands of magnification, wherein it can be seen that the component surface consists of a uniform material layer and no nitrogen-containing surface layer exists.
  • the nitriding of the component surface can, for example, be carried out by gas nitriding, the component being exposed at elevated temperatures to an atmosphere containing nitrogen or a nitrogen-containing compound such as ammonia, and additionally oxygen-containing May contain compounds such as oxygen or water.
  • the gas nitriding can be carried out, for example, as the DE 100 56 842 A1 can be seen.
  • the nitriding of the component surface takes place by means of a plasma nitriding process.
  • the nitriding process takes place at a reduced pressure of 250 Pa in a gas atmosphere containing 30 to 40% by volume of nitrogen, 15 to 25% by volume of hydrogen, 15 to 25% by volume of argon and 25 to 35% by volume of methane.
  • As the process temperature a temperature of 350 to 450 ° C is selected, the nitriding time is about 24 hours.
  • the set electrical voltage is between 400 and 600 volts, wherein preferably a pulsed AC voltage is used, which has a pulse / pause ratio of 1: 1 to 1: 3.
  • the nitriding process or the cold deformation can optionally precede a heat treatment of the workpiece surface to be nitrided, which is referred to as so-called tempering.
  • the workpieces to be nitrided are subjected to a cleaning treatment, for example by treatment with alkaline-aqueous cleaning agents or alcohol-based cleaning agents.
  • a cleaning treatment for example by treatment with alkaline-aqueous cleaning agents or alcohol-based cleaning agents.
  • the plasma nitriding can continue to fine cleaning of the workpiece surface by sputtering in a hydrogen or hydrogen-argon plasma before the actual plasma nitration.
  • the nitriding process can be followed by aftertreatment of the nitrided or partially nitrided components.
  • This post-treatment can take place in the form of a mechanical post-processing, for example by microstructuring the workpiece.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)

Abstract

L'invention concerne un procédé pour traiter une surface métallique (10), en particulier un fil de fer destiné à la production de ressorts de pression en spirale, la surface métallique (10) étant soumise à un procédé de nitration ou de trempe par nitruration et cémentation. Lesdites parties (14) de la surface métallique, qui ne sont pas soumises au traitement, sont soumises avant celui-ci à une étape de formage à froid.

Claims (9)

  1. Procédé de traitement d'une surface métallique d'un composant (10), dans lequel, dans une première étape, certaines parties du composant (10) subissent une déformation à froid pour obtenir un composant (10a) présentant des parties (14) dont la surface est déformée à froid, et dans une deuxième étape, le composant (10a) déformé à froid subit une opération de nitruration ou de nitrocarburation.
  2. Procédé selon la revendication 1, caractérisé en ce que la déformation à froid est une projection de billes, un gaufrage ou un laminage.
  3. Procédé selon les revendications 1 ou 2, caractérisé en ce que le traitement de nitruration ou de nitrocarburation est effectué à une température de 360 à 480°C.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que le traitement de nitruration ou de nitrocarburation est effectué pendant une durée de 5 à 24 heures.
  5. Procédé selon l'une des revendications précédentes, caractérisé en ce que la surface métallique (10, 14) subit une nitruration au plasma ou une nitrocarburation au plasma.
  6. Procédé selon la revendication 5, caractérisé en ce que la nitruration au plasma est basée sur une haute tension pulsée.
  7. Procédé selon l'une des revendications précédentes, caractérisé en ce que la surface métallique (10, 14) subit un revenu avant la nitruration ou la nitrocarburation.
  8. Procédé selon l'une des revendications précédentes, caractérisé en ce que la surface métallique (10, 14) est microstructurée après la nitruration ou la nitrocarburation.
  9. Utilisation d'un procédé selon l'une des revendications 1 à 8 pour fabriquer des ressorts spiralés de compression pour dispositifs d'injection.
EP05716985A 2004-04-29 2005-03-10 Procede pour traiter une surface Expired - Fee Related EP1745158B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200410021043 DE102004021043A1 (de) 2004-04-29 2004-04-29 Verfahren zur Oberflächenbehandlung
PCT/EP2005/051077 WO2005106063A1 (fr) 2004-04-29 2005-03-10 Procede pour traiter une surface

Publications (2)

Publication Number Publication Date
EP1745158A1 EP1745158A1 (fr) 2007-01-24
EP1745158B1 true EP1745158B1 (fr) 2010-12-15

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EP05716985A Expired - Fee Related EP1745158B1 (fr) 2004-04-29 2005-03-10 Procede pour traiter une surface

Country Status (3)

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EP (1) EP1745158B1 (fr)
DE (2) DE102004021043A1 (fr)
WO (1) WO2005106063A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109652757A (zh) * 2018-12-28 2019-04-19 宁波合力模具科技股份有限公司 一种高真空挤压压铸模的表面复合处理方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105177256B (zh) * 2015-08-31 2017-05-24 哈尔滨工业大学 一种Cr4Mo4V钢轴承强力喷丸和升温注渗复合表面强化方法
DE102019134498B4 (de) * 2019-12-16 2022-02-17 Scherdel Innotec Forschungs- Und Entwicklungs-Gmbh Verfahren zum Herstellen einer hochbelasteten Feder und hochbelastete Feder

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2038486A5 (en) * 1969-03-17 1971-01-08 Comp Generale Electricite Metallic coating having specific geometry
SU800235A1 (ru) * 1979-01-05 1981-01-30 Научно-Исследовательский Институтпорошковой Металлургии Белорусскогоордена Трудового Красного Знамениполитехнического Института "Способ обработки стальных изделий
JPH02301552A (ja) * 1989-05-17 1990-12-13 Aisin Takaoka Ltd 着色チタン材の製造方法
US5316594A (en) * 1990-01-18 1994-05-31 Fike Corporation Process for surface hardening of refractory metal workpieces
DE10056842B4 (de) * 2000-11-16 2005-06-23 Robert Bosch Gmbh Verfahren zur Oberflächenbehandlung von Druckspiralfedern
JP3780381B2 (ja) * 2001-12-25 2006-05-31 株式会社東郷製作所 高強度コイルばねおよびその製造方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109652757A (zh) * 2018-12-28 2019-04-19 宁波合力模具科技股份有限公司 一种高真空挤压压铸模的表面复合处理方法

Also Published As

Publication number Publication date
WO2005106063A1 (fr) 2005-11-10
DE502005010685D1 (de) 2011-01-27
EP1745158A1 (fr) 2007-01-24
DE102004021043A1 (de) 2005-11-24

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