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WO2005111253A1 - Courroie de poussee et son procede de fabrication - Google Patents

Courroie de poussee et son procede de fabrication Download PDF

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Publication number
WO2005111253A1
WO2005111253A1 PCT/NL2004/000357 NL2004000357W WO2005111253A1 WO 2005111253 A1 WO2005111253 A1 WO 2005111253A1 NL 2004000357 W NL2004000357 W NL 2004000357W WO 2005111253 A1 WO2005111253 A1 WO 2005111253A1
Authority
WO
WIPO (PCT)
Prior art keywords
ring
maraging steel
heat treatment
hardening
ageing
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.)
Ceased
Application number
PCT/NL2004/000357
Other languages
English (en)
Inventor
Cornelia Adriana Elizabeth Crebolder
Bert Pennings
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
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to EP04748593.3A priority Critical patent/EP1753889B1/fr
Priority to PCT/NL2004/000357 priority patent/WO2005111253A1/fr
Publication of WO2005111253A1 publication Critical patent/WO2005111253A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/40—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rings; for bearing races
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/10—Ferrous alloys, e.g. steel alloys containing cobalt
    • C22C38/105—Ferrous alloys, e.g. steel alloys containing cobalt containing Co and Ni
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium

Definitions

  • the present invention relates to a manufacturing method for push belts and to the product derived thereby, as defined by the preamble of the following claim 1.
  • the push belt is mainly used as the means for power transmission between two adjustable pulleys of the well-known continuously variable transmission applied in motor vehicles.
  • Such push belts which are generally composed of transverse metal elements that are slidably incorporated along one or more laminated set of radially nested metal rings or hoops, are generally known.
  • the rings of such belts are produced from maraging steel, which kind of steel combines a/o the characteristic of great tensile strength and good resistance against bending and/or tensile stress fatigue with a relatively favourable possibility to process the material towards the desired shape and characteristics.
  • These shape and characteristics should not vary along the circumference of the rings in the end product, i.e. should for example not show any weaker spot at a welding seam where the ends of a strip of base material are welded together to form the endless ring shape.
  • These characteristics comprise a fair hardness of the core material for realising the properties of good tensile, yield and bending strength combined with a high resistance against metal fatigue and a wear resistant outer surface layer, which is provided with a maximum thickness such that bending of the ring is not hampered by cracking and such that the core material of the ring retains sufficient strength and elasticity. Resistance against fatigue is a significant feature of the rings because of the numerous number of load and bending cycles the belt is subjected to during its service lifetime.
  • the manufacturing method for producing such belts, at least for such rings thereof, as applied by Applicant during several decades by now, is disclosed in general terms by the European patent application EP-A-1 055 738.
  • the metal rings are aged in a separate and well known precipitation hardening process by heat treatment in the presence of a controlled atmosphere predominantly composed of nitrogen (N2), during which ageing process intermetallic precipitates are formed throughout the ring material, and, subsequently, in a separate and well known gas -soft- nitriding process, a narrow surface layer is additionally hardened in this so-called case hardening process by heat treatment in the presence of a controlled atmosphere predominantly composed of ammonia (NH3) and nitrogen (N2), during which nitriding process non- metallic particles, i.e.
  • NH3 ammonia
  • N2 nitrogen
  • nitrides are formed predominantly in a superficial or i.e. thin surface layer of the ring material. It may be considered a general aim, and in the field of ring manufacture for push belts it has been a long standing desire, to combine the fore-mentioned separate preparatory hardening processes into one. Such combined ageing and nitriding is as such well known for the base material, i.e. maraging steel, of which the belt rings are made as is e.g. illustrated by the Metals Handbook, Vol. 1 , 1978 of the American Society for Metals (ASM).
  • ASM American Society for Metals
  • the material should be of a type showing the feature of relatively rapid ageing, such that within the short time required for nitriding process part for forming the hardened surface layer of desired thickness (case hardening) also a sufficient precipitation or age hardening of the core material would be realised.
  • Figure 1 figuratively represents the basic prior art ring age and case hardening processes
  • Figure 2 graphically represents the temperature T (Y-axis) and time t (X-axis) involved in the prior art processes according to figure 1
  • Figure 3 represents another prior art solution, avoiding a cooling down of the ring material in-between the age and case hardening processes.
  • Figure 4 graphically represents the temperature T (Y-axis) and time t (X-axis) involved in the prior art processes according to figure 2;
  • Figure 5 represents the solution according to the invention, in which the process parts of the known overall hardening process are combined into one, whereby the process duration and effort are significantly reduced;
  • Figure 6 graphically represents the temperature T (Y-axis) and time t (X-axis) involved in the proposed combined hardening process according to figure 5; and in which;
  • Figure 7 represents the feature of the material core hardness Hv (Y-axis) of two ring material compositions M1 and M2 versus the duration of the ageing or precipitation hardening process.
  • Figure 1 illustrates the relevant part of the known process as practised since the early years of metal push belt production.
  • first oven 1 for ageing or precipitation hardening of a ring 10 for the belt, which process predominantly determines the hardness of the ring core material
  • second oven 2 for surface layer or case hardening of the ring 10, which process predominantly determines the hardness of the ring surface layer material.
  • Ageing mainly adds to the tensile and yield strength of the ring 10, while a hardened surface layer is required as a means of protection against wear of the rings 10, due to for instance mutual friction between the rings and friction with a contacting surface of transverse elements of the belt.
  • transverse elements are incorporated mounted on and freely slidably along one or two sets of mutually nested rings 10.
  • the known rings 10 are made of Titanium (Ti) containing maraging steel, which steel is further mainly composed of Nickel (Ni), Molybdenum (Mo), Cobalt (Co) and balance Iron (Fe).
  • This type of maraging steel has the unique combination of features of high tensile and yield strength, high resistance against metal fatigue and also has other properties, such as good weldability, that make it suited for the production process used in push belt production.
  • a heat treatment in a controlled atmosphere predominantly composed of nitrogen (N2), which treatment is performed in the first oven 1.
  • a ring 10 is heat treated for case hardening, which is performed in the second oven 2, in a controlled nitrogen (N2) and -gaseous- ammonia (NH3) environment, which treatment is known as the gas soft nitriding process.
  • N2 controlled nitrogen
  • NH3 -gaseous- ammonia
  • the latter heat treatment is performed to form a surface layer of typically 25- 35 microns of extreme hardness, due to the formation of a nitrided surface layer in the ring material.
  • This surface layer thickness compares to a total ring thickness in the range between 150 and 200 microns, typically about equal to 185 microns.
  • the rings 10 are transported between the ovens 1, 2 and, as a consequence, cool down.
  • Figure 2 indicates that both the above-mentioned hardening processes are performed during a certain period of time t, whereby the processing time for the ageing process is indicated by ⁇ " and for the nitriding process by 'N'.
  • a typical value for H may be 60 minutes at a processing temperature T between about 450 to 500 °C.
  • the nitriding process may, typically, be performed for a somewhat shorter period and lasts between 45 to 60 minutes at a processing temperature T similar to that of the age hardening process.
  • the resulting hardness of the ring core material typically is around 600 Hv (Vickers hardness), while the surface hardness of the rings 10 is typically around 900 Hv.
  • Figure 3 illustrates a recent prior art improvement disclosed by EP-A-1 055 738 of the above-mentioned separate hardening processes.
  • the rings 10 are transferred from the first oven 1 to the second oven 2 through an intermediate space 3 by sequentially opening and closing intermediate doors 4 and 5 of such oven system 1-5 and by simultaneously moving the rings 10 between the subsequent (oven) spaces 1 , 3 and 2.
  • Figure 4 illustrates the singleness of the improved prior art process and shows a timesaving effect thereof in that at least a part of the cooling down and re-heating time between the ageing and nitriding processes is saved.
  • the solution is found in selected a new ring material, i.e. a maraging steel composition that is characterised by the Titanium element being largely, if not almost entirely omitted from the steel, i.e. a Titanium content that amounts to less than 0.1 mass-%, while at the same time the Cobalt content of the maraging steel is increased to over 10 mass-%, preferably to within a range of 85% to 100% of the Nickel content.
  • a new ring material i.e. a maraging steel composition that is characterised by the Titanium element being largely, if not almost entirely omitted from the steel, i.e. a Titanium content that amounts to less than 0.1 mass-%, while at the same time the Cobalt content of the maraging steel is increased to over 10 mass-%, preferably to within a range of 85% to 100% of the Nickel content.
  • the rings 10 could be aged and nitrided simultaneously in a single one oven 6 in a combined hardening process with while obtaining the required mechanical and other material properties as discussed in the above.
  • a preferred material in this respect further satisfies the requirement that the product of mass-% Cobalt and mass-% Molybdenum is equal to or lager than 50, but preferably smaller than 200.
  • the maraging steel M2 used here as an example is according to the invention provided with less than 0.1 mass-% Ti, about 18 mass-% Ni, 5 mass-% Mo, 16.5 mass-% Co and balance Fe, which compares to the conventional maraging steel M1 that is provided with about 0.45 mass-% Ti, 18 mass-% Ni, 5 mass-% Mo, 9 mass-% Co and balance Fe.
  • the strengthening effect of Cobalt in association with Molybdenum is used in an advantageous manner. It is considered that Cobalt will lower the solubility of Molybdenum in the martensite matrix of the steel, enhancing precipitation of Mo-rich intermetallic phases during ageing, and enhancing, i.e.
  • the required age hardening processing time H of the maraging steel M2 With this specific example of the composition of the maraging steel M2, a case hardened (nitrided) surface layer of the rings 10 of 28 microns was realised in the combined hardening, i.e. ageing and nitriding processes, at a total ring thickness of 185 microns. Moreover the additional advantage of an increased (i.e. with respect to the conventional maraging steel M1) ring core hardness of about 640 Hv was surprisingly realised with this maraging steel composition M2, while otherwise completely satisfying the required mechanical material properties.
  • the maraging steel composition may be fine-tuned within the ranges and requirements defined by the invention to reach the desired nitrided surface layer thickness in relation to the total ring thickness.
  • the feature enabling the combined hardening process for belt rings 10 is illustrated along the graph of figure 7.
  • the development over time t of the material hardness Hv due to ageing has been indicated for both the conventional maraging steel M1 for belt rings 10 and the new maraging steel
  • the graph shows that even at 480 °C the maximum (core) hardness level Hv of rings 10 of conventional maraging steel M1, i.e. as a result of age or precipitation hardening is reached only after a significantly long processing time t of up to 120 min. or 2 hours, whereas the newly selected maraging steel M2 reaches the same hardness level Hv must faster even at the lower processing temperature of 440 °C.
  • the maximum hardness level Hv of the newly selected maraging steel M2 is considerably higher than that of M1, which is considered an advantageous feature for the belt rings 10.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

L'invention concerne un procédé de fabrication d'un anneau sans fin (10) destiné à être utilisé dans une courroie de poussée pour des transmissions variables en continu. La matière (M1, M2) de l'anneau (10) est un acier maraging (M1, M2) et ledit anneau (10) est soumis à un traitement thermique dans une chambre chauffante (1, 6) en présence d'azote gazeux (N2) en vue de la trempe à coeur de la matière (M1, M2) formant l'anneau, par vieillissement, et à un traitement thermique dans une chambre chauffante (2, 6), en présence d'ammonium gazeux (NH2) en vue du durcissement superficiel de la matière (M1; M2) formant l'anneau, par nitruration. Lesdits traitements thermiques sont menés à bien dans un processus de durcissement combiné, simultanément et dans la même chambre chauffante (6). Le temps de traitement nécessaire (H) pour le traitement de vieillissement thermique de la composition de l'acier maraging sélectionnée pour être utilisée (M2) doit être égal à celui du traitement thermique de nitruration.
PCT/NL2004/000357 2004-05-19 2004-05-19 Courroie de poussee et son procede de fabrication Ceased WO2005111253A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP04748593.3A EP1753889B1 (fr) 2004-05-19 2004-05-19 Courroie de poussee et son procede de fabrication
PCT/NL2004/000357 WO2005111253A1 (fr) 2004-05-19 2004-05-19 Courroie de poussee et son procede de fabrication

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/NL2004/000357 WO2005111253A1 (fr) 2004-05-19 2004-05-19 Courroie de poussee et son procede de fabrication

Publications (1)

Publication Number Publication Date
WO2005111253A1 true WO2005111253A1 (fr) 2005-11-24

Family

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PCT/NL2004/000357 Ceased WO2005111253A1 (fr) 2004-05-19 2004-05-19 Courroie de poussee et son procede de fabrication

Country Status (2)

Country Link
EP (1) EP1753889B1 (fr)
WO (1) WO2005111253A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009056169A1 (fr) * 2007-10-31 2009-05-07 Robert Bosch Gmbh Anneau de courroie d'entraînement et procédé de fabrication de celui-ci
WO2009134119A1 (fr) * 2008-04-28 2009-11-05 Robert Bosch Gmbh Composant annulaire pour courroie d'entraînement, procédé de fabrication et matériau de base d'acier à trempe secondaire martensitique pour ce composant
WO2012083975A1 (fr) * 2010-12-20 2012-06-28 Robert Bosch G.M.B.H. Procédé de traitement thermique pour un procédé de fabrication d'un composant annulaire métallique de courroie d'entraînement
CN104728344A (zh) * 2013-12-24 2015-06-24 罗伯特·博世有限公司 用于无级变速器的传动带的金属环构件
WO2017041899A1 (fr) * 2015-09-08 2017-03-16 Robert Bosch Gmbh Élément annulaire métallique d'une courroie d'entraînement pour une transmission variable en continu

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5784144B2 (ja) 2010-12-20 2015-09-24 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツングＲｏｂｅｒｔ Ｂｏｓｃｈ Ｇｍｂｈ 駆動ベルト金属リング構成部材の製造プロセスのための熱処理プロセス
WO2013081451A1 (fr) 2011-11-30 2013-06-06 Robert Bosch Gmbh Procédé de traitement thermique dans un procédé de fabrication d'un composant annulaire métallique de courroie d'entraînement
NL1041102B1 (en) 2014-12-17 2016-10-11 Bosch Gmbh Robert Flexible steel ring for a drive belt for a continuously variable transmission and method for producing such.
NL1043487B1 (en) 2019-11-28 2021-08-31 Bosch Gmbh Robert Ring component of a drive belt for a continuously variable transmission

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01142021A (ja) * 1987-11-27 1989-06-02 Sumitomo Metal Ind Ltd 継目無金属ベルトの製造方法
JPH01142052A (ja) * 1987-11-27 1989-06-02 Sumitomo Metal Ind Ltd 継目無金属ベルト及びその製造方法
EP1055738A2 (fr) * 1999-05-28 2000-11-29 Honda Giken Kogyo Kabushiki Kaisha Procédé de fabrication des anneaux laminés et dispositif de traitment thermique utilisé dans ce procédé

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01142021A (ja) * 1987-11-27 1989-06-02 Sumitomo Metal Ind Ltd 継目無金属ベルトの製造方法
JPH01142052A (ja) * 1987-11-27 1989-06-02 Sumitomo Metal Ind Ltd 継目無金属ベルト及びその製造方法
EP1055738A2 (fr) * 1999-05-28 2000-11-29 Honda Giken Kogyo Kabushiki Kaisha Procédé de fabrication des anneaux laminés et dispositif de traitment thermique utilisé dans ce procédé

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
ASM INTERNATIONAL HANDBOOK COMMITEE: "MARAGING STEELS", 1990, METALS HANDBOOK, ASM INTERNATIONAL, 10TH EDITION, USA, XP002319725, 1 *
PATENT ABSTRACTS OF JAPAN vol. 013, no. 399 (C - 632) 5 September 1989 (1989-09-05) *

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009056169A1 (fr) * 2007-10-31 2009-05-07 Robert Bosch Gmbh Anneau de courroie d'entraînement et procédé de fabrication de celui-ci
CN101842502B (zh) * 2007-10-31 2012-10-03 罗伯特·博世有限公司 传动带环组件及其制造方法
WO2009134119A1 (fr) * 2008-04-28 2009-11-05 Robert Bosch Gmbh Composant annulaire pour courroie d'entraînement, procédé de fabrication et matériau de base d'acier à trempe secondaire martensitique pour ce composant
WO2012083975A1 (fr) * 2010-12-20 2012-06-28 Robert Bosch G.M.B.H. Procédé de traitement thermique pour un procédé de fabrication d'un composant annulaire métallique de courroie d'entraînement
CN103339267A (zh) * 2010-12-20 2013-10-02 罗伯特·博世有限公司 用于传动带金属环构件的生产方法的热处理方法
JP2014505790A (ja) * 2010-12-20 2014-03-06 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング 駆動ベルト金属リング構成部材の製造方法のための熱処理プロセス
CN103339267B (zh) * 2010-12-20 2016-03-09 罗伯特·博世有限公司 用于传动带金属环构件的生产方法的热处理方法
CN104728344A (zh) * 2013-12-24 2015-06-24 罗伯特·博世有限公司 用于无级变速器的传动带的金属环构件
WO2017041899A1 (fr) * 2015-09-08 2017-03-16 Robert Bosch Gmbh Élément annulaire métallique d'une courroie d'entraînement pour une transmission variable en continu
NL1041468B1 (en) * 2015-09-08 2017-03-22 Bosch Gmbh Robert Metal ring component of a drive belt for a continuously variable transmisson.
CN108350984A (zh) * 2015-09-08 2018-07-31 罗伯特·博世有限公司 用于无级变速器的传动带的金属环部件
CN108350984B (zh) * 2015-09-08 2020-09-08 罗伯特·博世有限公司 用于无级变速器的传动带的金属环部件

Also Published As

Publication number Publication date
EP1753889A1 (fr) 2007-02-21
EP1753889B1 (fr) 2017-04-12

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