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WO2013030017A1 - Dispositif permettant de durcir une surface pourvue d'éléments de type nervure ou dent - Google Patents

Dispositif permettant de durcir une surface pourvue d'éléments de type nervure ou dent Download PDF

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Publication number
WO2013030017A1
WO2013030017A1 PCT/EP2012/066111 EP2012066111W WO2013030017A1 WO 2013030017 A1 WO2013030017 A1 WO 2013030017A1 EP 2012066111 W EP2012066111 W EP 2012066111W WO 2013030017 A1 WO2013030017 A1 WO 2013030017A1
Authority
WO
WIPO (PCT)
Prior art keywords
tooth
induction coil
hardening
elements
rib
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/EP2012/066111
Other languages
German (de)
English (en)
Inventor
Klaus BÖRROTH
Philipp Blum
Peter DÖPKER
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 Automotive Steering GmbH
Original Assignee
ZF Lenksysteme 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 ZF Lenksysteme GmbH filed Critical ZF Lenksysteme GmbH
Publication of WO2013030017A1 publication Critical patent/WO2013030017A1/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
    • C21D1/06—Surface hardening
    • C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation
    • C21D1/10—Surface hardening by direct application of electrical or wave energy; by particle radiation by electric induction
    • 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
    • C21D9/32—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for gear wheels, worm wheels, or the like
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/101—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/36—Coil arrangements
    • H05B6/362—Coil arrangements with flat coil conductors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Definitions

  • the invention relates to a device for hardening a provided with rib-like or tooth-like elements surface on a component for a steering system, in particular for hardening toothings of racks, with a
  • the invention relates to a rack, in particular for a steering system of a vehicle.
  • Rib-like or tooth-like elements on surfaces of components of steering systems, such as teeth on racks have to withstand high loads. In particular, to minimize the wear on such
  • Components is a surface hardening of the surface of the components required. This is preferably the induction hardening.
  • the surfaces are brought to a required hardening temperature by induction and then quenched. This creates a hard, wear-resistant steel in the areas covered.
  • induction hardening the heat is generated in the respective workpiece itself.
  • all electrically conductive substances can be heated.
  • An induction coil, or inductor builds up a magnetic alternating field when it is traversed by alternating current.
  • the workpiece to be machined forms a short-circuited coil. If through the
  • Induction coil flows an alternating current, a voltage is induced in the workpiece, which has induced eddy currents in the workpiece. This current leads to a heating of the material of the workpiece. The heat does not enter the workpiece from the surface, but the heat is generated in the layer to be hardened. When heated to hardening temperature, the structure of the iron lattice changes from cubic-body centered to cubic-face centered. The carbon atoms diffuse into the metal lattice.
  • the metal grid works back without the carbon atoms changing their position.
  • the carbon atoms are held in the metal grid.
  • the resulting distortion of the space lattice of the metal manifests itself microscopically as a hardness increase of the material.
  • the structural transformation can influence the hardness, brittleness, toughness and the respective residual stress state of the material.
  • the current penetration depth and thus the hardness depth depends on the operating frequency of the respective
  • the hardening depth decreases with increasing operating frequency due to the so-called skin effect.
  • penetration depths of about 8 mm and in the high frequency range (50 kHz - 30 MHz) of about 0.1 mm can be achieved.
  • DE 10 2008 041 952 A1 shows a rack-shaped component provided with rib-like or tooth-like elements on its surface for a steering system made of tempered steel.
  • the rack has an at least part of its length extending, hardened by induction hardening
  • the teeth have individual, each having a tooth tip and two tooth flanks teeth and a respective, located between two adjacent teeth tooth base.
  • the toothing is hardened inductively such that the hardening depth, at least in the area of the tooth head and at least over a part of the tooth flanks, runs at least approximately parallel to the outer contour of the respective tooth.
  • the rack is hardened in the feed process, with the current being passed vertically over the teeth.
  • DT 24 01 170 A1 relates to a device for curing elongated
  • Pulse generator for generating periodically recurring pulses and with an induction coil fed by this induction coil, in the region of action of the workpiece to be hardened is passed.
  • the induction coil has a length which is approximately equal to the feed distance of a workpiece portion corresponding to the duration of two pulse intervals.
  • Induction coils is a uniform hardening in particular a tooth base possible only via heat conduction. Therefore, during induction hardening, comparatively high electrical powers are required for the device and the residence time of the respective component on the device is not minimized. In addition, this results in higher workpiece or component temperatures in a region of a head of tooth-like or rib-like elements. This can lead to an unfavorable structure, such as a coarse grain in said component area.
  • the invention has for its object to provide a device for curing a provided with rib-like or tooth-like elements surface on a component for a steering system, which is able to effect uniform curing over the entire surface of a pertinent component and their use no has unfavorable consequences for a microstructure of the device. Furthermore, the invention has for its object to provide a rack, in particular for a steering system, the surface of which is hardened with the device.
  • the induction coil is shaped so that an electric current is induced by these, which is at least partially directed orthogonal to the rib or tooth-like elements, a technical measure is specified, the rib or tooth-like elements on the surface of the component to be cured ,
  • teeth of a toothing of a rack and in particular the respective tooth base of the toothing by induction uniformly over the
  • the toothing can also be through hardened by induction.
  • the device whose induction coil has at least one about parallel and orthogonal to the rib or tooth-like elements engageable part, by means of which the respective tooth base of a toothing or the ground between rib-like elements can be heated and hardened.
  • the part of the induction coil is preferably formed from at least two legs arranged approximately parallel to one another which lead to a
  • Ring shape of the induction coil are assigned and can be traversed by electric current.
  • the part of the induction coil is used in particular for
  • Heating and hardening of the respective tooth base of the rib or tooth-like Elements can take place with the aid of a ring shape of the induction coil. It is advantageous to use a pulse generator for supplying the device with electric current.
  • Pulse generator supplies the induction coil with a converted from the network frequency low-mid or high-frequency power.
  • the pulse generator allows operation of the device at various frequencies
  • a toothing on a toothed rack can be hardened in such a way that desired specific degrees of hardness and grain structure can be achieved on the toothing and the toothed rack.
  • a rack can be used in particular for a steering gear of a vehicle, consisting of a
  • Harden tempered steel using induction hardening The result is a rack with good wear resistance and lowest distortion by curing.
  • the hardening depth in this case runs approximately parallel to an outer contour of the toothing, at least in the region of the tooth root. This results in particular a uniform hardness and hardness depth of the surface of the toothing and a fine grain structure at least in the tooth tips, which can not be achieved with the known devices for curing.
  • FIG. 1 in the manner of a functional sketch of a device according to the invention for
  • FIG. 2 shows a schematic, not to scale side view of a toothed rack whose tooth-like elements, such as a toothing, are hardened with a device according to the invention
  • Fig. 3 shows a detail III of the toothing in Fig. 2 in the manner of an enlarged
  • Fig. 1 is a designated as a whole by 1 device for curing a provided with rib or tooth-like elements 2 surface 3 on a device
  • the elements 2 are as teeth 18,18 'of a toothing
  • the surface of the toothing 5 is hardened by induction hardening with the aid of an induction coil 7, which is only partially shown.
  • the induction coil 7 is shaped so that an electrical current is induced, which is directed both orthogonal and parallel to the teeth 18,18 'and their respective tooth flanks 16,17.
  • Induction coil 7 are thereby moved relative to each other.
  • the induction coil 7, a part 8 which is at least approximately orthogonal and also parallel to the rib or tooth-like elements 2 or the teeth 18,18 'of the entire toothing 5 can be brought, i. in the embodiment shown transversely and parallel to the rack longitudinal direction
  • the part 8 preferably can be brought between the individual teeth.
  • the part 8 consists of two legs 9, 10 and one orthogonal to the toothing 5
  • the legs 9,10 are arranged at approximately constant distance from each other in parallel and as part of the integrally formed induction coil 7.
  • connecting regions 12 of the rib-like or tooth-like elements 2 such as a tooth base 13 between the teeth 18, 18 'takes place through the
  • the rack 6 is of the
  • Induction coil 7 in this case preferably enclosed and guided during curing by the induction coil 7. This is done over the entire length of the toothing 5 of the rack 6 shown schematically in Fig. 2 in a preferably continuous manner.
  • the device 1 and in particular the induction coil 7 is of a
  • Pulse generator 14 is supplied with an adjustable in frequency and current electric current. It can be with the illustrated device 1 with a small amount of time teeth 5 of racks 6 of a tempering steel for steering gear of a vehicle, such as for electric or hydraulic
  • the teeth have a plurality of teeth 18,18 ', each with a tooth head 15 and two tooth flanks 16,17, wherein between two adjacent teeth 18,18' each with the known curing only at the expense of Disadvantages for tooth strength hardenable tooth base 13 is located.
  • the induction coil 7 according to the invention is a
  • the gearing 5 therefore has a fine even after curing with the device 1 according to the invention

Landscapes

  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electromagnetism (AREA)
  • Heat Treatment Of Articles (AREA)
  • Gears, Cams (AREA)

Abstract

L'invention concerne un dispositif (1) qui permet de durcir une surface (3) pourvue d'éléments (2) de type nervure ou dent, située sur une pièce (4) destinée à un système de direction, et notamment de durcir les dents (5) de tiges de crémaillère (6), comportant une bobine d'induction (7) dans la zone d'action de laquelle est placée la surface à durcir (3). L'invention concerne en outre une tige de crémaillère (6) dont les dents (5) ont été durcies au moyen de ce dispositif (1). L'objet de la présente invention est la mise au point d'un dispositif destiné à durcir une surface pourvue d'éléments de type nervure ou dent, située sur une pièce destinée à un système de direction, qui permet de réaliser un durcissement régulier sur toute la surface de la pièce, et qui permet d'éviter des conséquences négatives sur la structure de ladite pièce. A cet effet, ladite bobine d'induction (7) présente une forme telle que ladite bobine (7) provoque l'induction d'un courant électrique qui est au moins partiellement orienté de façon orthogonale aux éléments (2) de type nervure ou dent.
PCT/EP2012/066111 2011-08-31 2012-08-17 Dispositif permettant de durcir une surface pourvue d'éléments de type nervure ou dent Ceased WO2013030017A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011053139.4 2011-08-31
DE102011053139A DE102011053139A1 (de) 2011-08-31 2011-08-31 Vorrichtung zum Härten einer mit rippen- oder zahnartigen Elementen versehenen Oberfläche

Publications (1)

Publication Number Publication Date
WO2013030017A1 true WO2013030017A1 (fr) 2013-03-07

Family

ID=46651547

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2012/066111 Ceased WO2013030017A1 (fr) 2011-08-31 2012-08-17 Dispositif permettant de durcir une surface pourvue d'éléments de type nervure ou dent

Country Status (2)

Country Link
DE (1) DE102011053139A1 (fr)
WO (1) WO2013030017A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019127231A1 (de) 2019-08-09 2021-02-11 Liebherr-Components Biberach Gmbh Verfahren und Vorrichtung zum induktiven Härten

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2401170A1 (de) 1974-01-11 1975-07-24 Seelemann Baumann Gmbh Vorrichtung zum haerten von laenglichen werkstuecken
JP2003147438A (ja) * 2001-11-06 2003-05-21 Fuji Electronics Industry Co Ltd ラックギヤ焼入装置
WO2010028939A1 (fr) * 2008-09-10 2010-03-18 Zf Lenksysteme Gmbh Crémaillère et procédé de trempe inductif

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3843457C1 (fr) * 1988-12-23 1989-07-20 Aeg-Elotherm Gmbh, 5630 Remscheid, De
FR2746574B1 (fr) * 1996-03-22 1998-05-15 Renault Dispositif de chauffage par induction pour le traitement superficiel de la denture d'une piece mecanique

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2401170A1 (de) 1974-01-11 1975-07-24 Seelemann Baumann Gmbh Vorrichtung zum haerten von laenglichen werkstuecken
JP2003147438A (ja) * 2001-11-06 2003-05-21 Fuji Electronics Industry Co Ltd ラックギヤ焼入装置
WO2010028939A1 (fr) * 2008-09-10 2010-03-18 Zf Lenksysteme Gmbh Crémaillère et procédé de trempe inductif
DE102008041952A1 (de) 2008-09-10 2010-03-25 Zf Lenksysteme Gmbh Zahnstange

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 200349, Derwent World Patents Index; AN 2003-517685, XP002686924 *

Also Published As

Publication number Publication date
DE102011053139A1 (de) 2013-02-28

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