WO2007145502A1 - Procédé de fabrication de fins anneaux en métal - Google Patents

Procédé de fabrication de fins anneaux en métal Download PDF

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Publication number
WO2007145502A1
WO2007145502A1 PCT/NL2006/000286 NL2006000286W WO2007145502A1 WO 2007145502 A1 WO2007145502 A1 WO 2007145502A1 NL 2006000286 W NL2006000286 W NL 2006000286W WO 2007145502 A1 WO2007145502 A1 WO 2007145502A1
Authority
WO
WIPO (PCT)
Prior art keywords
rings
manufacturing
steel sheet
plate section
pushbelt
Prior art date
Application number
PCT/NL2006/000286
Other languages
English (en)
Inventor
Bert Pennings
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 JP2009515321A priority Critical patent/JP2009539619A/ja
Priority to PCT/NL2006/000286 priority patent/WO2007145502A1/fr
Publication of WO2007145502A1 publication Critical patent/WO2007145502A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G5/00—V-belts, i.e. belts of tapered cross-section
    • F16G5/16—V-belts, i.e. belts of tapered cross-section consisting of several parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass

Definitions

  • the present invention relates to a manufacturing method for making thin metal rings for use in a laminated set of endless rings of a pushbelt as defined by the preamble of the following claim 1.
  • the pushbelt as such is generally known in the art and is described in detail in, for example, EP-A 1 403 551.
  • the belt is mainly used as a means for power transmission between two adjustable pulleys in the well-known continuously variable transmission that is applied in motor vehicles.
  • the known pushbelt is composed of a multitude of relatively thin transverse metal elements that are provided on one or two of such laminated set(s) of rings, slideably along the circumference thereof.
  • These rings are usually produced from a precipitation hardening steel composition, such as a Maraging steel, that combines a/o the properties of great tensile strength and resistance against tensile and bending stress fatigue with a relatively favourable possibility to process it from raw base material towards the desired shape and properties of the rings.
  • the thus formed rings are subjected to several further process steps, as is exemplified in, for instance, the European patent application EP-A 1 055 738 to realise the particular product characteristics that are desired for their application in the pushbelt.
  • EP-A 1 055 738 European patent application EP-A 1 055 738 to realise the particular product characteristics that are desired for their application in the pushbelt.
  • the pushbelt a number of such rings are mutually nested in radial direction, i.e. concentrically stacked, with a defined radial play being provided between adjacent rings to form each set of rings of the pushbelt.
  • the tube is formed such that its peripheral direction and thus also that of the rings to be separated there from corresponds with the length direction of the elongated steel sheet, i.e. the rolling direction in the preceding process step.
  • This particular orientation of the tube relative to the elongated steel sheet, from which it is formed, has from the start of commercial pushbelt manufacture in the nineteen eighties up to present day been considered an inevitable essential aspect of the production process.
  • the rings can be provided with a different circumference length simply by increasing the diameter of the tube, i.e. the length of the plate section separated from the elongated steel sheet, for producing pushbelts of different length.
  • the plate section cut from the elongated steel sheet in the width direction thereof to form the tube i.e. apparently without adversely affecting the fatigue strength thereof.
  • this novel feature of the manufacturing method may as such not seem very remarkable or advantageous, it does provide a significant improvement of both the overall production process and the rings produced thereby, as will be understood from the following.
  • the axial tube size and thus the number of ring sections that can be separated there from is determined by the width of the elongated steel sheet, whereby in theory a wider steel sheet provides for a more efficient and economical production process with less plate cutting, tube bending, welding and handling actions being required.
  • the width of the sheet is limited to a certain dimension.
  • a small ingot of base material will normally provide more favourable material characteristics, e.g. in terms of optimal homogeneity and purity as defined by the number and size of non-metallic inclusions contained therein. That is to say, that the larger the ingot is, the more difficult and/or cost-intensive it is to control such homogeneity and purity, whereby it is to be noted that the dimensions of the steel sheet, including its width, are related to and limited by the size of the said ingot.
  • the width of the elongated steel sheet is determined by the circumference length of the ring sections to be separated there from, which typically amounts to around 250 to 350 mm or favourably only half the sheet width that can maximally be applied in the conventional manufacturing method.
  • Figure 1 is a schematic illustration of the pushbelt the present invention relates to and of the transmission in which such belt is applied;
  • Figure 2 is an illustration of the manner in which a laminated tensile means and a transverse element are mutually oriented within the pushbelt;
  • Figure 3 figuratively represents the presently relevant process steps in the known method for manufacturing thin metal rings used in a laminated set of endless rings for a pushbelt;
  • Figure 4 is a photograph of a cold rolled Maraging steel microstructure
  • Figure 5 is a diagram showing the measured fatigue strength of various test pieces made from the material for the pushbelt ring component; and Figure 6 figuratively represents the method for manufacturing thin metal rings for a pushbelt according to the invention.
  • FIG 1 shows schematically a continuously variable transmission (CVT) with a drive belt 1 wrapped around two pulleys 4 and 5, which belt 1 is made up of two sets 2 of endless, mutually concentrically nested, thin metal rings 16 and an essentially continuous array of transverse elements 3 that are mounted along the circumference of the sets 2 of rings 16 and which may freely slide there along.
  • This type of drive belt 1 is commonly referred to as pushbelt 1. Both the pushbelt 1 and the continuously variable transmission as a whole are well known per se.
  • Figure 2 depicts, in a longitudinal cross-section of the belt 1 , a front view of a transverse element 3 and a cross section of the sets 2 of rings 16.
  • the transverse element 3 laterally shows side faces 6 by which it engages the conical sheaves of the transmission pulleys 4, 5.
  • the rings 16 are made of a high quality steel, e.g. a nitrided and precipitation hardened Maraging steel, and typically have a thickness of about 0.18 mm, a width of about 10 mm and a circumference length of around 500 to 750 mm.
  • a slab 10 is cast, forged and possibly cut to size departing from an ingot of a desired steel alloy.
  • This slab 10 is subsequently, in a second process step II, rolled to form an elongated steel sheet 11 having a minimal thickness in relation to its width W and length L dimensions.
  • the steel sheet 11 is often coiled up lengthwise into a spiral shape (not shown).
  • a plate section 12 is separated from the -uncoiled- steel sheet 11 , which plate section 12 is subsequently bent in the length direction L of the elongated steel sheet 11 into a cylindrical shape and the adjoining plate ends 13 are welded together in a fourth process step IV to form a tube 14.
  • the tube axis thus being oriented along the width W of the steel sheet 11.
  • the tube 14 is annealed.
  • the tube 14 is separated into a number of annular hoops or rings 16, which are subsequently - process step seven VII- rolled and elongated to a required circumference length and/or radial thickness, whereby the axial width of the rings 16 is influenced only slightly.
  • the rings 16 are considerably more flexible, in particular in the peripheral direction.
  • the rolled rings 16 are subjected to a further annealing process step VIII to remove the internal stresses introduced during rolling and in a ninth process step IX the rings 16 are calibrated, i.e. longitudinally stretched to a, usually individually determined, predefined circumference length, which in this example is realised by mounting the rings around two rotating rollers that are forced radially apart.
  • the rings 16 undergo a heat treatment.
  • the heat treatment includes at least two phases: in the first phase the rings 16 are precipitation hardened, i.e.
  • the rings 16 are nitrided (indicated by the letter “N"), to provide additional hardness as well as a compressive stress to the outer surface layer of the rings 16.
  • the ring set 2 is formed by radially stacking, i.e. nesting, a number of purposely selected rings 16, as is further indicated in figure 3.
  • a representative dimension of each processed ring 16, e.g. its circumference length is measured in an eleventh process step Xl, wherein the rings 16 are classified and stocked by such length.
  • the set 2 of rings 16 is assembled by mutually nesting a required number of suitably dimensioned rings 16 from such stock of classified rings 16.
  • Titanium-nitride (TiN) inclusions are present in the elongated steel sheet in the form of so-called strings that are composed of a series of inclusions in very close, virtually continuous succession, as shown in figure 4.
  • these strings have a length of around 100 to 300 micrometer and a width of around 10 to 30 micrometer and are oriented in alignment with the length direction L of the sheet 11 , because they are formed when a larger TiN-inclusion disintegrates into a number of smaller pieces that are smeared out in the said rolling direction in the above second process step Il under the influence of the rolling forces.
  • each (outlined) circle represents a test result obtained when the tensile stress is applied in the rolling direction in the second process step II
  • each (filled-up) square represents the test result obtained with the tensile stress is applied in a direction transversely to the said rolling direction. It may be clear from figure 5 that between the said two test directions no noticeable difference in fatigue strength could be demonstrated.
  • the efficiency of the known ring manufacturing method can be improved without detriment to the ultimate fatigue strength of the pushbelt 1 , by bending the plate section 12 in the width direction W of the elongated steel sheet 11 to form the tube 14 in the above third process step III, which novel setup of the process is illustrated in the figure 5.
  • the tube axis thus being along the length L of the steel sheet 11.
  • the axial size of the tube 14 can exceed the width of the elongated steel sheet 11 , i.e. of the plate section 12, such that favourably less plate cutting actions (process step III), tube bending and welding actions (process step IV) need to be performed in relation to the number of rings 16 produced.
  • the rings are rolled in the seventh process step VII in a second direction, which is oriented transversely to the first rolling direction in the second process step II. It may be expected that hereby the strings of inclusions formed in the first rolling direction by the shear forces in the former rolling process step Il are to some extend broken up in the said second direction transversely thereto by the shear forces exerted in this seventh process step VII.
  • the present novel ring manufacturing method could thereby reduce the stress raising effect of the -string of- inclusions, thus improving the resistance against fatigue fracture of the rings 16. In this way, the present invention unlocks a previously unknown and even unattainable potential of improving the fatigue strength of the pushbelt end-product.
  • the above measure of varying the thickness of the elongated steel sheet 11 in relation to, preferably in direct proportion to the circumference length required for the rings 16 can also be applied with advantage in the above conventional manufacturing method.
  • the plate section 12 can be cut from the elongated steel sheet 11 with a fixed length, i.e. irrespective of the circumference length of the rings 16 to be produced there from.
  • the diameter of the tube 14 that is bend and welded from such plate has a fixed value, which feature brings considerable advantages, in particular in terms of allowing a simplified, i.e. less intricate product handling and/or manipulation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Metal Rolling (AREA)
  • Forging (AREA)

Abstract

L'invention concerne un procédé pour fabriquer de fins anneaux (16) en métal, par exemple pour une courroie de poussée (1) qui comprend au moins un de ces anneaux (16) et un grand nombre d'éléments métalliques transversaux (3). Le procédé comprend les étapes de traitement (III, IV, VI) qui consistent à découper une partie de tôle (12) dans une longueur (L) d'une tôle d'acier allongée (11), à cintrer la partie de tôle (12) de manière à lui donner une forme cylindrique et à souder les extrémités (13) jointives de la partie de tôle (12) cintrée afin de former un tube (14). Dans l'étape (III) de traitement susmentionnée de cintrage de la partie de tôle (12) en une forme cylindrique, la partie de tôle (12) est cintrée dans une direction essentiellement perpendiculaire à ladite longueur (L) de la tôle d'acier allongée (11), c'est-à-dire suivant sa largeur (W).
PCT/NL2006/000286 2006-06-12 2006-06-12 Procédé de fabrication de fins anneaux en métal WO2007145502A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2009515321A JP2009539619A (ja) 2006-06-12 2006-06-12 薄型金属リングを作成するための製造方法
PCT/NL2006/000286 WO2007145502A1 (fr) 2006-06-12 2006-06-12 Procédé de fabrication de fins anneaux en métal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/NL2006/000286 WO2007145502A1 (fr) 2006-06-12 2006-06-12 Procédé de fabrication de fins anneaux en métal

Publications (1)

Publication Number Publication Date
WO2007145502A1 true WO2007145502A1 (fr) 2007-12-21

Family

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PCT/NL2006/000286 WO2007145502A1 (fr) 2006-06-12 2006-06-12 Procédé de fabrication de fins anneaux en métal

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JP (1) JP2009539619A (fr)
WO (1) WO2007145502A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009166108A (ja) * 2008-01-18 2009-07-30 Toyota Motor Corp リング部材の製造方法
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
WO2009132689A1 (fr) * 2008-04-28 2009-11-05 Robert Bosch Gmbh Procédé de fabrication d’un composant d'anneau de courroie d'entraînement
US7632180B2 (en) * 2007-02-28 2009-12-15 Cnh America Llc Method of making a rotor for a threshing system of an agricultural combine
WO2010002240A1 (fr) * 2008-06-30 2010-01-07 Robert Bosch Gmbh Procédé de traitement thermique pour composant de bague métallique pour courroie d'entraînement

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61201949A (ja) * 1985-02-28 1986-09-06 Hitachi Metals Ltd マルエ−ジング鋼製エンドレススチ−ル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
EP1243812A1 (fr) 2001-03-19 2002-09-25 Van Doorne's Transmissie B.V. Courroie à éléments poussants et matériau pour celle-ci
JP2003236610A (ja) * 2002-02-19 2003-08-26 Hitachi Metals Ltd 金属無端リング材の製造方法及び金属無端リング材
JP2004011683A (ja) * 2002-06-04 2004-01-15 Nisshin Steel Co Ltd ステンレス鋼製無段変速機用ベルト及びその製造方法
EP1403551A1 (fr) 2002-09-30 2004-03-31 Van Doorne's Transmissie B.V. Courroie de transmission et transmission continûment variable l'utilisant
JP2006124757A (ja) * 2004-10-27 2006-05-18 Toyota Motor Corp 無端金属ベルトの製造方法
WO2006054885A1 (fr) * 2004-11-17 2006-05-26 Robert Bosch Gmbh Courroie de poussee et son procede de fabrication

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61201949A (ja) * 1985-02-28 1986-09-06 Hitachi Metals Ltd マルエ−ジング鋼製エンドレススチ−ル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
EP1243812A1 (fr) 2001-03-19 2002-09-25 Van Doorne's Transmissie B.V. Courroie à éléments poussants et matériau pour celle-ci
JP2003236610A (ja) * 2002-02-19 2003-08-26 Hitachi Metals Ltd 金属無端リング材の製造方法及び金属無端リング材
JP2004011683A (ja) * 2002-06-04 2004-01-15 Nisshin Steel Co Ltd ステンレス鋼製無段変速機用ベルト及びその製造方法
EP1403551A1 (fr) 2002-09-30 2004-03-31 Van Doorne's Transmissie B.V. Courroie de transmission et transmission continûment variable l'utilisant
JP2006124757A (ja) * 2004-10-27 2006-05-18 Toyota Motor Corp 無端金属ベルトの製造方法
WO2006054885A1 (fr) * 2004-11-17 2006-05-26 Robert Bosch Gmbh Courroie de poussee et son procede de fabrication

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
"ASM Handbook, "Fatigue and Fracture Properties of Structural Steels"", vol. 19, 1996, article ""Fracture Toughness" and "Fatigue Crack Growth""
G.FOWLER.: ""The Influence of Non-metallic inclusions on the Treshold", MATERIALS SCIENCE AND ENGINEERING JOURNAL., vol. 39, 1979, pages 121 - 126
Y.FURUYA ET AL.: ""Inclusion - Controlled Fatigue Properties of 1800 MPA-Class Spring Steels"", METALLURGICAL AND MATERIALS TRANSACTIONS JOURNAL., vol. 35A, December 2004 (2004-12-01), pages 3737 - 3744

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7632180B2 (en) * 2007-02-28 2009-12-15 Cnh America Llc Method of making a rotor for a threshing system of an agricultural combine
JP2009166108A (ja) * 2008-01-18 2009-07-30 Toyota Motor Corp リング部材の製造方法
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
WO2009132689A1 (fr) * 2008-04-28 2009-11-05 Robert Bosch Gmbh Procédé de fabrication d’un composant d'anneau de courroie d'entraînement
CN102015148A (zh) * 2008-04-28 2011-04-13 罗伯特·博世有限公司 传动带环部件的制造方法
WO2010002240A1 (fr) * 2008-06-30 2010-01-07 Robert Bosch Gmbh Procédé de traitement thermique pour composant de bague métallique pour courroie d'entraînement

Also Published As

Publication number Publication date
JP2009539619A (ja) 2009-11-19

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