EP3339968A1 - Bauteil für uhrwerk - Google Patents

Bauteil für uhrwerk Download PDF

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Publication number
EP3339968A1
EP3339968A1 EP16205455.5A EP16205455A EP3339968A1 EP 3339968 A1 EP3339968 A1 EP 3339968A1 EP 16205455 A EP16205455 A EP 16205455A EP 3339968 A1 EP3339968 A1 EP 3339968A1
Authority
EP
European Patent Office
Prior art keywords
magnetic
pivot
oxide layer
alloy
light metal
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.)
Pending
Application number
EP16205455.5A
Other languages
English (en)
French (fr)
Inventor
Alexandre Fussinger
Philippe Barfuss
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.)
Nivarox Far SA
Nivarox SA
Original Assignee
Nivarox Far SA
Nivarox SA
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 Nivarox Far SA, Nivarox SA filed Critical Nivarox Far SA
Priority to EP16205455.5A priority Critical patent/EP3339968A1/de
Priority to US15/834,635 priority patent/US10635050B2/en
Priority to JP2017237460A priority patent/JP6644759B2/ja
Priority to RU2017144413A priority patent/RU2766515C2/ru
Priority to CN201711372696.0A priority patent/CN108205249A/zh
Publication of EP3339968A1 publication Critical patent/EP3339968A1/de
Priority to HK18115293.2A priority patent/HK1256197A1/zh
Pending legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B1/00—Driving mechanisms
    • G04B1/10—Driving mechanisms with mainspring
    • G04B1/16—Barrels; Arbors; Barrel axles
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B13/00—Gearwork
    • G04B13/02—Wheels; Pinions; Spindles; Pivots
    • G04B13/026—
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B15/00—Escapements
    • G04B15/14—Component parts or constructional details, e.g. construction of the lever or the escape wheel
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B17/00—Mechanisms for stabilising frequency
    • G04B17/32—Component parts or constructional details, e.g. collet, stud, virole or piton
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B31/00—Bearings; Point suspensions or counter-point suspensions; Pivot bearings; Single parts therefor
    • G04B31/004—Bearings; Point suspensions or counter-point suspensions; Pivot bearings; Single parts therefor characterised by the material used
    • G04B31/012—Metallic bearings
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B43/00—Protecting clockworks by shields or other means against external influences, e.g. magnetic fields
    • G04B43/007—Antimagnetic alloys

Definitions

  • the invention relates to a piece for a watch movement and in particular to a non-magnetic pivoting axis for a mechanical clockwork movement and more particularly to a balance shaft, an anchor rod and a nonmagnetic escape pinion.
  • the manufacture of a clock pivot axis consists, from a bar of hardened steel, to perform machining operations to define different active surfaces (scope, shoulder, pivots etc.) and then to subject the axis Vietnameselleté to heat treatment operations comprising at least one quench to improve the hardness of the axis and one or more income to improve toughness.
  • the heat treatment operations are followed by a rolling operation of the pivots of the axes, an operation consisting in polishing the pivots to bring them to the required dimensions. During the rolling operation the hardness as well as the roughness of the pivots are further improved.
  • the pivot axes for example the balance shafts, conventionally used in mechanical watch movements are made in grades of free cutting steels which are generally carbon martensitic steels including lead and manganese sulphides to improve their performance. machinability.
  • a steel of this type designated 20AP is typically used for these applications.
  • This type of material has the advantage of being easily machinable, in particular to be able to bar-turning and has, after treatments of quenching and tempering, high mechanical properties very interesting for the realization of horological pivot axes.
  • These steels have in particular after heat treatment a high hardness, to obtain a very good resistance to shocks.
  • the hardness of the pivots of an axis made of steel AP may reach a hardness exceeding 700 HV after heat treatment and rolling.
  • this type of material has the disadvantage of being magnetic and of being able to disrupt the running of a watch after being subjected to a magnetic field, and in particular when this material is used for producing a balance shaft cooperating with a balance spring of ferromagnetic material. This phenomenon is well known to those skilled in the art. It should also be noted that these martensitic steels are also susceptible to corrosion.
  • austenitic stainless steels which have the particularity of being non-magnetic, that is to say of the paramagnetic or diamagnetic or antiferromagnetic type.
  • these austenitic steels have a crystallographic structure that does not allow them to be hardened and to reach hardnesses and therefore impact strengths that are compatible with the requirements required for the realization of clockwise pivot axes.
  • the axes obtained then have marks or severe damage in case of shocks which will then have a negative influence on the chronometry of the movement.
  • One way to increase the hardness of these steels is work hardening, however this hardening operation does not allow to obtain hardnesses greater than 500 HV. Therefore, in the context of parts having pivots having a high impact resistance, the use of this type of steel remains limited.
  • the object of the present invention is to overcome the drawbacks mentioned above by proposing a pivot axis which makes it possible at the same time to limit the sensitivity to magnetic fields and to obtain an improved hardness compatible with the requirements of resistance to wear and shock. in the watchmaking field.
  • the invention also aims to provide a non-magnetic pivot axis that can be manufactured simply and economically.
  • the invention relates to a pivot axis for a watch movement comprising at least one pivot made of a nonmagnetic metallic material at at least one of its ends in order to limit its sensitivity to magnetic fields.
  • said non-magnetic metallic material is a non-magnetic light metal or a non-magnetic alloy of said light metal, and at least the outer surface of said pivot is covered with an anode oxide layer of said material.
  • the anodic oxide layer being obtained by growth during anodization has excellent adhesion and a much higher hardness than the nonmagnetic metallic material.
  • the pivot axis according to the invention makes it possible to combine the advantages of a low sensitivity to magnetic fields and of an improved hardness compatible with the requirements of resistance to wear and shocks in the watchmaking field.
  • the invention relates to a clockwork comprising a pivot axis as defined above, and in particular a balance shaft, an anchor rod and / or an exhaust pinion comprising an axis. as defined above.
  • non-magnetic material means a paramagnetic or diamagnetic or antiferromagnetic material whose magnetic permeability is less than or equal to 1.01.
  • An alloy of an element is an alloy containing at least 50% by weight of said element.
  • the invention relates to a piece for a watch movement and in particular to a non-magnetic pivoting axis for a mechanical clockwork movement.
  • a balance shaft 1 which comprises a plurality of sections 2 of different diameters, preferably formed by machining or any other machining by chip removal technique, and classically defining bearing surfaces 2a and shoulders 2b arranged between two end portions defining two pivots 3. These pivots are intended to each rotate in a bearing, typically in a hole of a stone or ruby.
  • the pivot 3 is made of a nonmagnetic metallic material 4 in order to advantageously limit its sensitivity to magnetic fields.
  • said nonmagnetic metallic material 4 is a non-magnetic light metal or a non-magnetic alloy of said light metal.
  • said non-magnetic metal material 4 used in the invention is chosen from the group comprising aluminum, titanium, magnesium and their non-magnetic alloys.
  • said nonmagnetic metal material 4 is chosen from the group comprising a 6000 series aluminum alloy (Al Mg Si), a 7000 series aluminum alloy with copper (Al Zn Cu). , a Grade 5 titanium alloy (comprising from 5.5 to 6.75% Al and 3.5 to 4.5% V), an alloy of Mg-Zr, the proportions of the various elements of the alloys being chosen to give them non-magnetic properties as well as 'good machinability. These alloys have the particular property of being able to be turned and be suitable for anodizing.
  • a particularly preferred alloy is the EN AW 6082 aluminum alloy, the EN AW 7075 aluminum alloy, and the EN AW 7068 aluminum alloy.
  • composition values are given as a percentage by mass.
  • the elements without indication of composition value are either the remainder (majority) or elements for which the percentage in the composition is less than 1% by weight.
  • non-magnetic alloys based on light metal are possible since the proportion of their constituents gives them non-magnetic properties and good machinability.
  • the nonmagnetic metal material based on light metal used in the invention generally has a hardness of less than 250 HV or 100 HV. In addition to the advantage of being non-magnetic, this material has a low inertia due to its low weight.
  • At least the outer surface of said pivot 3 is covered with an anodic oxide layer of said material 5, obtained by growth by anodization.
  • This growth-grown oxide layer has excellent adhesion to the pivot base material to prevent further delamination during use.
  • Said growth-grown oxide layer also has improved hardness compatible with wear and shock resistance requirements in the watchmaking field.
  • the formed anodic layer 5 has a hardness of advantageously greater than 300 HV, preferably greater than 400 HV, and more preferably greater than 500 HV.
  • the anodic layer 5 formed may have a thickness of between 2 ⁇ m and 50 ⁇ m, preferably between 10 ⁇ m and 30 ⁇ m.
  • the anodic oxide layer 5 is formed by anodization according to step b) to have a thickness of between 2 microns and 50 microns, preferably between 10 microns and 30 microns.
  • the anodizing treatment of step b) is a conventional anodizing process or a micro-arc oxidation process.
  • Conventional anodizing is achieved by imposing a continuous current on the system.
  • the conventional anodization can be of different types and can be carried out for example in oxalic or sulfuric medium.
  • An oxalic medium is preferred.
  • the various parameters of conventional anodization to be taken into account such as the composition of the electrolytic bath, and in particular the choice and the concentration of the acid, the operating conditions such as the temperature of the electrolyte, the pH, the intensity of the Anodizing current, to obtain an anode oxide layer of thickness and hardness suitable for the invention, are known to those skilled in the art.
  • anodizing treatments for titanium are carried out in accordance with AMS 2488 with alkaline anodization.
  • the thickness of the anodic layer is approximately 3 ⁇ m.
  • Microscale oxidation is a surface electrolytic process based on the principle of conventional anodizing while differentiating itself from it by both the power supply and the nature of the electrolyte. It shows on the surface of the material micro-plasma discharges during treatment. Electrolytic plasma oxidation processes are generally carried out in weakly concentrated alkaline baths with current densities generally less than 1 A / cm 2 and voltages greater than 200 V. Those skilled in the art can choose the relative parameters in particular to the power supply source, namely the current mode (current density, frequency and waveform), charge density and current density, and electrolytes, in particular those based on water (composition and concentration) for obtain an anode layer of oxide of thickness and hardness suitable for the invention.
  • the power supply source namely the current mode (current density, frequency and waveform), charge density and current density, and electrolytes, in particular those based on water (composition and concentration) for obtain an anode layer of oxide of thickness and hardness suitable for the invention.
  • the method according to the invention may comprise a preliminary surface treatment step necessary to clean the axes before subjecting them to anodization.
  • the pivot axis according to the invention may comprise pivots treated according to the invention by applying step b) only pivots or be made entirely of a non-magnetic metallic material based on light metal, its outer surface can be covered completely an anode oxide layer of said material by applying step b) on all of the surfaces of the pivot axis.
  • the method according to the invention may further comprise, after step b), a finishing step c).
  • the finishing treatment may be a rolling or polishing operation in order to achieve the desired final surface state for the pivots 3.
  • the finishing treatment may be an operation of raking to remove the porous surface layer.
  • the 6082 aluminum balance shaft is covered with an anodic aluminum oxide layer of thickness 5.8 ⁇ m.
  • the hardness at heart is measured at 119 HV0.01.
  • the hardness in the anodic oxide layer is measured at 695 HV0.01.
  • a lightweight metal (aluminum) balance shaft is obtained which combines the advantages of low sensitivity to magnetic fields, hardness and high toughness in the main stress zones while having good resistance to corrosion and fatigue. .

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Metallurgy (AREA)
  • Manufacturing & Machinery (AREA)
  • Heat Treatment Of Articles (AREA)
  • Sliding-Contact Bearings (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
EP16205455.5A 2016-12-20 2016-12-20 Bauteil für uhrwerk Pending EP3339968A1 (de)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP16205455.5A EP3339968A1 (de) 2016-12-20 2016-12-20 Bauteil für uhrwerk
US15/834,635 US10635050B2 (en) 2016-12-20 2017-12-07 Component for a timepiece movement
JP2017237460A JP6644759B2 (ja) 2016-12-20 2017-12-12 計時器用ムーブメントのための部品
RU2017144413A RU2766515C2 (ru) 2016-12-20 2017-12-19 Компонент для часового механизма
CN201711372696.0A CN108205249A (zh) 2016-12-20 2017-12-19 用于钟表机芯的部件
HK18115293.2A HK1256197A1 (zh) 2016-12-20 2018-11-29 用於鐘錶機芯的部件

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16205455.5A EP3339968A1 (de) 2016-12-20 2016-12-20 Bauteil für uhrwerk

Publications (1)

Publication Number Publication Date
EP3339968A1 true EP3339968A1 (de) 2018-06-27

Family

ID=57570845

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16205455.5A Pending EP3339968A1 (de) 2016-12-20 2016-12-20 Bauteil für uhrwerk

Country Status (6)

Country Link
US (1) US10635050B2 (de)
EP (1) EP3339968A1 (de)
JP (1) JP6644759B2 (de)
CN (1) CN108205249A (de)
HK (1) HK1256197A1 (de)
RU (1) RU2766515C2 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200192300A1 (en) * 2018-12-18 2020-06-18 Rolex Sa Strengthened timepiece component

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH338767A (de) * 1957-04-30 1959-05-31 Brac Ag Und Jean Bugnon Ankerhemmung für Uhrwerke
FR1249229A (fr) * 1957-04-30 1960-12-30 Straumann Inst Ag Pièces de montre comportant des surfaces soumises à frottement
FR1439940A (fr) * 1965-03-12 1966-05-27 Tissot Horlogerie échappement à ancre pour mouvement d'horlogerie
DE102009046647A1 (de) * 2009-11-12 2011-05-19 Schmidt, Lothar, Dipl.-Ing. Uhr
EP2757423A1 (de) 2013-01-17 2014-07-23 Omega SA Bauteil für Uhrwerk
CH707504A2 (fr) * 2013-01-17 2014-07-31 Omega Sa Axe de pivotement en métal pour mouvement horloger et procédé de fabrication d'un tel axe.
CH707505A2 (fr) * 2013-01-17 2014-07-31 Omega Sa Axe de pivotement en métal pour mouvement horloger et procédé de fabrication d'un tel axe.
CH707986A2 (fr) * 2013-04-24 2014-10-31 Lvmh Swiss Mft Sa Pièce pour l'horlogerie.

Family Cites Families (8)

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Publication number Priority date Publication date Assignee Title
JPS53108461A (en) * 1977-03-03 1978-09-21 Sankyo Seiki Seisakusho Kk Bearing device
JP4003382B2 (ja) * 2000-07-14 2007-11-07 セイコーエプソン株式会社 発電機および電子制御式機械時計
JP2010261906A (ja) * 2009-05-11 2010-11-18 Seiko Instruments Inc 時計用歯車及び時計
CH707503A2 (fr) * 2013-01-17 2014-07-31 Omega Sa Axe de pivotement pour mouvement horloger.
EP2887150A1 (de) * 2013-12-20 2015-06-24 ETA SA Manufacture Horlogère Suisse Optimiertes Federgehäuse einer Uhr
EP3273307A1 (de) * 2016-07-19 2018-01-24 Nivarox-FAR S.A. Bauteil für uhrwerk
EP3273305B1 (de) * 2016-07-19 2023-07-19 Nivarox-FAR S.A. Bauteil für uhrwerk
EP3273303A1 (de) * 2016-07-19 2018-01-24 Nivarox-FAR S.A. Bauteil für uhrwerk

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH338767A (de) * 1957-04-30 1959-05-31 Brac Ag Und Jean Bugnon Ankerhemmung für Uhrwerke
FR1249229A (fr) * 1957-04-30 1960-12-30 Straumann Inst Ag Pièces de montre comportant des surfaces soumises à frottement
FR1439940A (fr) * 1965-03-12 1966-05-27 Tissot Horlogerie échappement à ancre pour mouvement d'horlogerie
DE102009046647A1 (de) * 2009-11-12 2011-05-19 Schmidt, Lothar, Dipl.-Ing. Uhr
EP2757423A1 (de) 2013-01-17 2014-07-23 Omega SA Bauteil für Uhrwerk
CH707504A2 (fr) * 2013-01-17 2014-07-31 Omega Sa Axe de pivotement en métal pour mouvement horloger et procédé de fabrication d'un tel axe.
CH707505A2 (fr) * 2013-01-17 2014-07-31 Omega Sa Axe de pivotement en métal pour mouvement horloger et procédé de fabrication d'un tel axe.
CH707986A2 (fr) * 2013-04-24 2014-10-31 Lvmh Swiss Mft Sa Pièce pour l'horlogerie.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ANONYMOUS: "Eloxal-Verfahren - Wikipedia", 6 October 2016 (2016-10-06), XP055381527, Retrieved from the Internet <URL:https://de.wikipedia.org/w/index.php?title=Eloxal-Verfahren&oldid=158514634> [retrieved on 20170614] *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200192300A1 (en) * 2018-12-18 2020-06-18 Rolex Sa Strengthened timepiece component
US12061445B2 (en) * 2018-12-18 2024-08-13 Rolex Sa Strengthened timepiece component

Also Published As

Publication number Publication date
JP6644759B2 (ja) 2020-02-12
RU2766515C2 (ru) 2022-03-15
US10635050B2 (en) 2020-04-28
JP2018100960A (ja) 2018-06-28
RU2017144413A3 (de) 2021-07-05
HK1256197A1 (zh) 2019-09-13
RU2017144413A (ru) 2019-06-19
US20180173165A1 (en) 2018-06-21
CN108205249A (zh) 2018-06-26

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