EP1419281B1 - Procede permettant d'augmenter la charge dynamique d'un element structural dente - Google Patents

Procede permettant d'augmenter la charge dynamique d'un element structural dente Download PDF

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Publication number
EP1419281B1
EP1419281B1 EP02774512A EP02774512A EP1419281B1 EP 1419281 B1 EP1419281 B1 EP 1419281B1 EP 02774512 A EP02774512 A EP 02774512A EP 02774512 A EP02774512 A EP 02774512A EP 1419281 B1 EP1419281 B1 EP 1419281B1
Authority
EP
European Patent Office
Prior art keywords
carbon content
component
increasing
carburization
layer
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
EP02774512A
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German (de)
English (en)
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EP1419281A2 (fr
Inventor
Jörg KLEFF
Dieter Wiedmann
Alois Weiss
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.)
ZF Friedrichshafen AG
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ZF Friedrichshafen AG
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Publication date
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Publication of EP1419281A2 publication Critical patent/EP1419281A2/fr
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    • 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
    • C23C8/06—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 using gases
    • C23C8/08—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 using gases only one element being applied
    • C23C8/20—Carburising
    • C23C8/22—Carburising of ferrous surfaces

Definitions

  • the invention relates to a method for increasing the dependent on the carbon content dynamic Loading capacity of a toothed component made of case hardenable Stole.
  • JP 01052056 discloses a method for removing a carburized one Layer.
  • the carburized layer is by means of mechanical manufacturing removed.
  • Object of the present invention is therefore, a Method for increasing the depending on the carbon content standing dynamic load capacity of a toothed Case hardenable steel component available which is a subsequent solidification blasting unnecessary and a cheaper production of a component or increasing the dynamic load capacity.
  • the inventive method for increasing the depending carbon content dynamic Load capacity of a toothed component for example a gear of case hardenable steel, wherein first the course of the carbon content in the surface layer of the Component is adjusted so that the carbon content, starting from the surface towards the core of the component, initially increasing and above a certain Layer depth decreases continuously, and in the subsequent a part of the surface layer in areas of the component, especially in the area of the tooth flanks, is removed, their dynamic load capacity with increasing carbon increases on the surface of the component offers the advantage that on the surface of the component an optimized marginal carbon content present, each having a maximum value ensures the carrying capacity of the relevant component area.
  • the two courses 1, 2 of the carbon content in the Peripheral layer of a gear are from its surface too represented a core.
  • content of carbon in percent
  • edge distance from the surface of the gear in millimeters.
  • the course 1 gives a carbon content C in the Edge layer of the gear again, which by a conventional Case hardening method was produced.
  • This Course 1 shows a maximum of the carbon content C im immediate area of the surface of the gear on and the carbon content C increases with increasing edge distance steady and at least approximately linear.
  • the curve 2 of the carbon content C in the edge zone a gear is by means of the modified case hardening process set with edge carburizing and designed in such a way that the carbon content, starting from the surface of the gear, initially increases in the direction of the core and above a certain layer depth, in the present case for example, with an edge distance of about 0.15 mm, a Maximum of 0.7% carbon. Starting from this Maximum takes the carbon content in the direction of Kerns of the gear continuously.
  • edge decarburization is due to a strong lowering of the carbon content the atmosphere of the carburettor in the last Stage of the case hardening process, for example during holding at hardening temperature, adjusted or generated.
  • the gear made of case hardenable steel for example 18 CrNiMo 88, is in throughout the case hardening process a heating furnace of a gaseous carburizing agent surrounded, its carbon content during the individual Phases of the case hardening process is changed.
  • the case hardening process includes those known per se Phases, namely a heating phase, a carburizing phase, a Cooling phase and a holding phase to hardening temperature of Component, these successive phases respectively over a certain period of time at given temperatures and different carbon content of the gas atmosphere be performed.
  • the carbon content initially during the heating phase is smaller than during the subsequent carburisation phase.
  • the carbon content can, for example, during the heating phase, 0.4% be.
  • the subsequent carburizing phase is known and preferably divided into four sections or steps, the carbon content in the first three Grades from 0.4% gradually to 0.6% and finally up a value of 1.1% is raised, and where the period of time in which a carbon content of 1.1% is set is fifteen times the period in which a carbon content adjusted by 0.6%. In a last temporal, short section of the carburizing phase this is reduced again to a value of 1.0%.
  • the Temperatures of the heating phase and the carburizing phase are in the described embodiment approximately at 930 ° C.
  • Cooling phase corresponds to the carbon content of the last Section or the last period of the carburizing phase.
  • the holding phase during which the gear is at hardening temperature is held, again divided into several Sections or stages, wherein the carbon content of the Atmosphere of the gaseous carburizing agent in a first Section is set to a value of 0.4%.
  • the second section of the halt phase being a longer one Period as the first portion of the holding phase includes, and z. B. last almost twice as long as the first section can.
  • the temperature of the cooling phase and the holding phase corresponds to about 860 ° C.
  • the gear is cured directly in oil and then annealed at about 170 ° C for 90 minutes.
  • the toothed component For example, a gear, hard in the tooth flanks edited, with the removal of material of the edge zone about the Area of edge carburization corresponds.
  • a grinding process is preferably provided, which has been used in practice to improve the Surface quality of the tooth flanks is provided.
  • the area The tooth base is usually not subsequently processed. That is, the cost-intensive known from the prior art Solidification jets can be avoided and thus fall in comparison to conventional manufacturing processes no additional costs for solidification blasting at.
  • the tooth flank carrying capacity has its maximum Value at a carbon content in a range of 0.6% up to 0.9%, with the tooth flank carrying capacity, starting of a carbon content of 0.6%, with increasing Carbon content in the border zone steadily increases. That means, that before the material removal a Zahnflanketragoom at a carbon content of 0.6% in the range the surface of the tooth flank has a value below one Maximums has. Due to the removal of material, the surface layer so removed that layer areas of the surface layer the tooth flank form the surface of the gear, which have a higher carbon content than near-surface areas of the tooth root. This will be the Tooth flange bearing capacity of conventional case hardening reached again. A maximum Zahnfußtraghow is not affected by the grinding of the tooth flank.
  • modified Case hardening which is a direct hardening with edge carburizing represents, and the subsequent hard machining the tooth flank optimized marginal carbon contents, each having a maximum load capacity of the tooth flank and effect the tooth base.

Landscapes

  • 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)
  • Heat Treatment Of Articles (AREA)
  • Gears, Cams (AREA)

Claims (5)

  1. Procédé pour améliorer la limite de charge dynamique admissible, existant en fonction de la teneur en carbone, d'une pièce dentée en acier de cémentation dans lequel, tout d'abord, le profil de variation (2) de la teneur en carbone dans la couche superficielle de la pièce est établi de manière que la teneur en carbone croisse initialement de la surface vers le coeur de la pièce et décroisse continuellement à partir d'une certaine profondeur de la couche et en ce que, ensuite, une partie de la couche superficielle est enlevée dans des régions de la pièce, en particulier dans la région des flancs de dents, de telle manière que la valeur maximale de la teneur en carbone se trouve à la surface de la pièce.
  2. Procédé selon la revendication 1, caractérisé en ce que le profil de variation (2) de la teneur en carbone dans la couche superficielle de la pièce est produit par carburation.
  3. Procédé selon la revendication 2, caractérisé en ce que, pendant la carburation, la pièce est entourée d'un milieu carburant gazeux et la teneur en carbone de l'atmosphère peut être modifiée.
  4. Procédé selon la revendication 3, caractérisé en ce que, vers la fin de la carburation, par exemple pendant une phase de maintien à la température de trempe de la pièce, qui fait suite à une phase de refroidissement, la teneur en carbone de l'atmosphère est réglée sur un niveau sensiblement plus bas que pendant la carburation.
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que la partie de la couche superficielle qu'il s'agit d'enlever est enlevée sur le flanc des dents par usinage mécanique.
EP02774512A 2001-08-17 2002-08-14 Procede permettant d'augmenter la charge dynamique d'un element structural dente Expired - Lifetime EP1419281B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10140444A DE10140444A1 (de) 2001-08-17 2001-08-17 Verfahren zum Erhöhen der dynamischen Belastbarkeit eines verzahnten Bauteils
DE10140444 2001-08-17
PCT/EP2002/009087 WO2003016582A2 (fr) 2001-08-17 2002-08-14 Procede permettant d'augmenter la charge dynamique d'un element structural dente

Publications (2)

Publication Number Publication Date
EP1419281A2 EP1419281A2 (fr) 2004-05-19
EP1419281B1 true EP1419281B1 (fr) 2005-01-05

Family

ID=7695799

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Application Number Title Priority Date Filing Date
EP02774512A Expired - Lifetime EP1419281B1 (fr) 2001-08-17 2002-08-14 Procede permettant d'augmenter la charge dynamique d'un element structural dente

Country Status (5)

Country Link
US (1) US20040206421A1 (fr)
EP (1) EP1419281B1 (fr)
JP (1) JP2004538370A (fr)
DE (2) DE10140444A1 (fr)
WO (1) WO2003016582A2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016012941B4 (de) 2016-10-28 2019-06-06 Mvo Gmbh Metallverarbeitung Ostalb Verfahren zur Bearbeitung einer Zahnstange und danach bearbeitete Zahnstange

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3543440A1 (de) * 1985-12-09 1987-06-11 Horst Gerdes Verfahren zum aufkohlen beim einsatzhaerten
JPH0751740B2 (ja) * 1987-08-20 1995-06-05 三菱自動車工業株式会社 浸炭焼入部品の浸炭抜き方法
DE4227447C2 (de) * 1991-08-21 2003-08-21 Dana Corp Zahnräder für Fahrzeugachsen
DE4327440C2 (de) * 1993-08-14 1997-07-03 Schaeffler Waelzlager Kg Verfahren zur thermochemisch-thermischen Behandlung von Einsatzstählen, Vergütungsstählen und Wälzlagerstählen
JP3308377B2 (ja) * 1994-03-09 2002-07-29 大同特殊鋼株式会社 歯面強度の優れた歯車およびその製造方法

Also Published As

Publication number Publication date
WO2003016582A3 (fr) 2004-01-29
JP2004538370A (ja) 2004-12-24
EP1419281A2 (fr) 2004-05-19
WO2003016582A2 (fr) 2003-02-27
DE50201965D1 (de) 2005-02-10
DE10140444A1 (de) 2003-02-27
US20040206421A1 (en) 2004-10-21

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