CN107632508B - Component for a timepiece movement - Google Patents

Component for a timepiece movement Download PDF

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CN107632508B
CN107632508B CN201710584919.3A CN201710584919A CN107632508B CN 107632508 B CN107632508 B CN 107632508B CN 201710584919 A CN201710584919 A CN 201710584919A CN 107632508 B CN107632508 B CN 107632508B
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alloy
pivot
copper
layer
nickel
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CN107632508A (en
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A·弗辛格
C·沙邦
M·韦拉尔多
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Nivarox Far SA
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Nivarox Far SA
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Priority claimed from EP16180226.9A external-priority patent/EP3273304B1/en
Priority claimed from EP17157065.8A external-priority patent/EP3273307A1/en
Application filed by Nivarox Far SA filed Critical Nivarox Far SA
Priority to CN202110652156.8A priority Critical patent/CN113296382A/en
Publication of CN107632508A publication Critical patent/CN107632508A/en
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    • 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
    • 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
    • G04B13/021—Wheels; Pinions; Spindles; Pivots elastic fitting with a spindle, axis or shaft
    • G04B13/022—Wheels; Pinions; Spindles; Pivots elastic fitting with a spindle, axis or shaft with parts made of hard material, e.g. silicon, diamond, sapphire, quartz and the like
    • 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
    • G04B29/00—Frameworks
    • 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

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Metallurgy (AREA)
  • Manufacturing & Machinery (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Sliding-Contact Bearings (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

The invention relates to a pivoting arbour (1) for a timepiece movement, comprising at least one pivot (3) at least one end thereof, the pivot (3) being made of a first non-magnetic metal material (4) so as to limit its sensitivity to magnetic fields. At least the outer surface of the pivot (3) is covered with a layer (5) of a second material selected from the group comprising Ni and NiP, and preferably chemical NiP. The invention concerns the field of timepiece movements.

Description

Component for a timepiece movement
Technical Field
The present invention relates to a member for a timepiece movement, and in particular to a non-magnetic pivoting arbour for a mechanical timepiece movement, and more particularly to a non-magnetic balance staff, fork and escape pinion.
Background
Manufacturing a pivoting arbour for a timepiece comprises performing a rod turning operation on a hardenable steel rod to define various working surfaces (bearing surfaces, shoulders, pivots, etc.) and then subjecting the rod turned arbour to a heat treatment comprising at least one hardening operation to increase the hardness of the arbour and one or more tempering operations to increase the toughness of the arbour. The heat treatment operation is followed by an operation of rolling the pivot portion of the mandrel, which includes polishing the pivot portion to a desired size. The hardness and roughness of the pivot is further improved during the rolling operation.
The pivoting arbour, such as a balance staff, commonly used in mechanical horological movements, is made of steel grade for bar turning, usually martensitic carbon steel comprising lead and manganese sulphides to improve its machining properties. A known such steel, known as 20AP, is typically used for these applications.
This material has the advantage of being easy to machine, in particular suitable for bar turning, and has excellent mechanical properties after hardening and tempering, which is very advantageous for the manufacture of timepiece pivoting arbours. These steels exhibit high hardness, in particular after being subjected to a heat treatment, enabling very good impact resistance to be obtained. Typically, the hardness of a spindle pivot made of 20AP after heat treatment and rolling can exceed 700 HV.
Although this material provides satisfactory mechanical properties for the above-mentioned applications in the horological field, it has the disadvantage of being magnetic and thus interfering with the operation of the watch when subjected to a magnetic field, in particular when this material is used to make a balance staff cooperating with a balance spring made of ferromagnetic material. This phenomenon is well known to those skilled in the art. It is also worth noting that these martensitic steels are also susceptible to corrosion.
Attempts have been made to overcome these disadvantages by using austenitic stainless steels which have non-magnetic properties, i.e. are paramagnetic or diamagnetic or antiferromagnetic. However, these austenitic steels have a crystalline structure which makes it impossible to harden them to various hardness levels, thus failing to achieve impact resistance which meets the requirements required for the manufacture of timepiece pivot spindles. The spindle obtained then becomes marked or seriously damaged in the event of impact, which then negatively affects the timing of the movement. One method of increasing the hardness of these steels is cold working, but this hardening operation does not achieve a hardness higher than 500 HV. Therefore, the use of such steels is still limited for parts requiring the pivot to exhibit high impact resistance.
Another method which attempts to overcome these drawbacks is described in patent application EP 2757423. According to the method, the pivot spindle is made of an alloy of austenitic cobalt or nickel and has an outer surface hardened to a certain depth. However, these alloys may exhibit difficulty machining for use in manufacturing the pivot spindle. In addition, these alloys are relatively expensive due to the high cost of nickel and cobalt.
Disclosure of Invention
The aim of the present invention is to overcome the above drawbacks by proposing a pivoting spindle that is capable of achieving mechanical properties that meet the impact resistance requirements required by the horological industry, while limiting the sensitivity to magnetic fields.
It is a further object of the present invention to provide a non-magnetic pivot spindle that can be manufactured simply and economically.
To this end, the invention relates to a pivoting arbour for a timepiece movement, comprising at least one pivot at least one of its ends, made of a first non-magnetic metallic material to limit its sensitivity to magnetic fields.
According to the invention, at least the outer surface of the pivot is covered with a layer of a second material selected from the group comprising Ni and NiP.
The pivot spindle according to the invention can thus combine the advantages of low sensitivity to magnetic fields and excellent impact resistance at least in the region of the main stresses. The pivoting arbour according to the invention therefore does not present any signs or any serious damages that could affect the timing of the movement in the event of an impact.
According to other advantageous features of the invention:
-the layer of the second material has a thickness comprised between 0.5 μm and 10 μm, preferably between 1 μm and 5 μm, more preferably between 1 μm and 2 μm;
the layer of the second material has a hardness preferably higher than 400HV, more preferably higher than 500 HV;
the layer of second material is preferably a chemical NiP layer, i.e. obtained by chemical deposition.
Furthermore, the invention relates to a timepiece movement including a pivoting arbour as defined above, and in particular to a balance staff, a fork staff and/or an escape pinion including an arbour as defined above.
Finally, the invention relates to a method for manufacturing a pivot spindle as defined above, comprising the steps of:
a) forming a pivot spindle including at least one pivot at least one end thereof, the pivot being made of a first non-magnetic metal material to limit its sensitivity to magnetic fields;
b) depositing a layer of a second material selected from the group consisting of Ni and NiP on at least an outer surface of the pivot portion.
According to other advantageous features of the invention:
-depositing a layer of a second material in step b) so as to exhibit a thickness comprised between 0.5 μm and 10 μm, preferably between 1 μm and 5 μm, more preferably between 1 μm and 2 μm;
-the second material is NiP, and step b) comprises performing NiP deposition in a process of electroless nickel deposition using hypophosphite.
Drawings
Further characteristics and advantages will be clearly apparent from the following description, given by way of non-limiting example, with reference to the accompanying drawings, in which:
figure 1 is a view of a pivot spindle according to the invention;
figure 2 is a partial sectional view of a pendulum shaft pivot according to the invention;
FIG. 3 is a photograph of a pivot spindle of untreated high clearance steel (HIS) that has been subjected to an impact procedure;
fig. 4 is a photograph of a HIS pivot spindle covered with a NiP layer according to the invention, which has been subjected to the same impact procedure as the pivot spindle of fig. 3.
Detailed Description
In the present description, the term "non-magnetic" refers to paramagnetic or diamagnetic or antiferromagnetic materials having a magnetic permeability lower than or equal to 1.01.
An alloy of an element is an alloy comprising at least 50% by weight of such element.
The present invention relates to a component for a timepiece movement, and in particular to a non-magnetic pivoting arbour for a mechanical timepiece movement.
The invention will be described below with reference to the application of a non-magnetic pendulum shaft 1. Of course, other types of timepiece pivoting arbour are also envisaged, such as a timepiece wheel set arbour, typically an escape pinion or a fork. Such a member has a body with a diameter preferably smaller than 2mm and a pivot with a diameter preferably smaller than 0.2mm, with an accuracy of a few micrometers.
With reference to fig. 1, there is shown a pendulum shaft 1 according to the present invention, comprising a plurality of segments 2 of different diameters, preferably formed by bar turning or any other chip removing machining process and defining in a conventional manner a bearing surface 2a and a shoulder 2b, arranged between two ends defining two pivots 3. These pivots are each intended to pivot in a bearing, typically in an aperture of a jewel or ruby bearing.
Due to the magnetic properties induced by the objects encountered each day, it is important to limit the sensitivity of the balance staff 1 to avoid affecting the operation of the timepiece containing it.
The pivot 3 is therefore made of a first non-magnetic metallic material 4, so as to advantageously limit its sensitivity to magnetic fields.
Preferably, the first non-magnetic metallic material 4 is selected from the group comprising: austenitic steel (preferably stainless steel), austenitic cobalt alloy, austenitic nickel alloy, non-magnetic titanium alloy, non-magnetic aluminium alloy, brass (Cu-Zn) or special brass (Cu-Zn containing Al and/or Si and/or Mn), copper beryllium alloy, bronze (Cu-Sn), aluminium bronze, copper aluminium alloy (optionally including Ni and/or Fe), copper nickel alloy, nickel silver alloy (Cu-Ni-Zn), copper nickel tin alloy, copper nickel silicon alloy, copper nickel phosphorous alloy, copper titanium alloy, wherein the proportions of the various alloy elements are selected to provide the alloy with non-magnetic properties and good machinability.
For example, the austenitic steel is a high interstitial austenitic stainless steel, such as Cr-Mn-N P2000 steel from Energietechnik Essen GmbH.
An austenitic cobalt alloy may comprise at least 39% cobalt, typically an alloy known under the name "Phynox" or reference DINK13C20N16Fe15D7, typically having 39% Co, 19% Cr, 15% Ni and 6% Mo, 1.5% Mn, 18% Fe, with the remainder being additives.
The austenitic nickel alloy may comprise at least 33% nickel, typically of known reference number
Figure BDA0001353251260000052
Typically having 35% Ni, 20% Cr, 10% Mo, 33% Co, with the remainder being additives.
The titanium alloy preferably comprises at least 85% titanium.
The brass may comprise the alloys CuZn39Pb3, CuZn37Pb2 or CuZn 37.
The special brass may comprise the alloys CuZn37Mn3Al2PbSi, CuZn23Al3Co or CuZn23Al6Mn4Fe3 Pb.
The nickel silver alloy may comprise the alloys CuNi25Zn11Pb1Mn, CuNi7Zn39Pb3Mn2 or CuNi18Zn19Pb 1.
The bronze may include the alloys CuSn9 or CuSn 6.
The aluminum bronze may include the alloy CuAl9 or CuAl9Fe5Ni 5.
The copper-nickel alloy may include the alloy CuNi 30.
The copper nickel tin alloy may include the alloys CuNi15Sn8, CuNi9Sn6, or CuNi7.5sn5 (e.g., sold under the name declador).
The copper titanium alloy may include the alloy CuTi3 Fe.
The copper nickel silicon alloy may include the alloy CuNi3 Si.
The copper nickel phosphorous alloy may include the alloy CuNi 1P.
The copper beryllium alloy may include the alloys CuBe2Pb or CuBe 2.
The composition values are given in mass percent. Elements with unspecified component values are either the remainder (majority) or elements with component percentages below 1% by weight.
The non-magnetic copper alloy may also be an alloy consisting of, by mass, 14.5% to 15.5% Ni, 7.5% to 8.5% Sn, up to 0.02% Pb, and the balance Cu. Such alloys are sold by the company Material under the trademark "Matrion
Figure BDA0001353251260000051
Of course, other non-magnetic alloys are also conceivable as long as their constituent proportions satisfy both non-magnetic properties and good machinability.
The first non-magnetic metal material typically has a hardness of less than 600 HV.
According to the invention, at least the outer surface of the pivot 3 is covered with a layer 5 of a second material selected from the group comprising Ni and NiP, in order to advantageously provide mechanical properties in the outer surface that enable the required impact resistance to be achieved.
In the second material, the phosphorus content may preferably be between 0% (in this case pure Ni) and 15%. Preferably, the phosphorous content in the NiP second material may be a medium level between 6% and 9% or a high level between 9% and 12%. However, it is clearly clear that the NiP second material may have a lower phosphorous content.
Furthermore, when the second material is NiP with a medium or high phosphorous level, the layer of NiP second material may be hardened by means of a heat treatment.
The layer of the second material preferably has a hardness higher than 400HV, more preferably higher than 500 HV.
It is particularly advantageous that the layer of unhardened Ni or NiP second material preferably has a hardness higher than 500HV but lower than 600HV, i.e. preferably between 500HV and 550 HV. Surprisingly and unexpectedly, the pivot spindle according to the invention has an excellent impact resistance, although the second material layer may have a lower Hardness (HV) than the first material layer.
The layer of NiP second material may have a hardness between 900HV and 1000HV when hardened by means of heat treatment.
Advantageously, the layer of the second material may have a thickness of between 0.5 μm and 10 μm, preferably between 1 μm and 5 μm, more preferably between 1 μm and 2 μm.
Preferably, the layer of the second material is a NiP layer, and in particular a chemical NiP layer, i.e. deposited by chemical deposition.
Combinations relating to the following are particularly preferred:
copper beryllium alloy, in particular CuBe2Pb, as first non-magnetic metallic material, with a chemical NiP layer as second material layer 5;
copper nickel tin alloy, especially Decaflor or
Figure BDA0001353251260000061
As the first nonmagnetic metal material, a chemical NiP layer is used as the second material layer 5;
stainless steel, in particular high gap stainless steel, as the first non-magnetic metallic material, a chemical NiP layer as the second material layer 5.
Thus, at least the outer surface area of the pivot is hardened, i.e. the rest of the spindle can remain unchanged or hardly changed, without any significant change in the mechanical properties of the pendulum shaft 1. This selective hardening of the pivot 3 of the pendulum shaft 1 makes it possible to combine the advantages of mechanical properties such as low sensitivity to magnetic fields and very good impact resistance in the main stress areas.
To improve the resistance of the layer of the second material, the pivot spindle may comprise at least one adhesion sublayer deposited between the layer of the first material and the layer of the second material. For example, a sublayer of gold and/or a sublayer of electroplated nickel may be provided under the layer of the second material, especially if the pivot spindle is made of high gap stainless steel.
The invention also relates to a method for manufacturing a pendulum shaft as described above. The method of the invention advantageously comprises the following steps:
a) forming a pendulum shaft 1, preferably by bar turning or any other chip removing machining process, the pendulum shaft 1 comprising at each of its ends at least one pivot 3 made of a first non-magnetic metal material to limit its sensitivity to magnetic fields; and
b) at least on the outer surface of said pivot 3a layer 5 of a second material is deposited, said second material being selected from the group comprising Ni and NiP, in order to improve the mechanical properties of the pivot to obtain a suitable impact resistance at least in the region of the prevailing stress.
Preferably, the layer 5 of the second material is deposited in step b) so as to exhibit a thickness comprised between 0.5 μm and 10 μm, preferably between 1 μm and 5 μm, more preferably between 1 μm and 2 μm.
Advantageously, step b) of depositing the layer 5 of the second material may be achieved by a method selected from the group comprising PVD, CVD, ALD, electroplating and chemical deposition, preferably chemical deposition.
According to a particularly preferred embodiment, the second material is NiP and the step of depositing NiP layer 5 is carried out by a process of electroless nickel deposition using hypophosphite.
Various parameters to be considered in chemical nickel deposition using hypophosphite, such as the phosphorus level in the deposition, pH, temperature, or nickel plating bath composition, are known to those skilled in the art. For example, reference may be made to the publication by y.ben Amor et al:
Figure BDA0001353251260000071
chimique de nickel，synthèse bibliographique，Matériaux&techniques 102, 101 (2014). However, it is noted that commercial baths having moderate phosphorus levels (6-9%) or high phosphorus levels (9-12%) are preferred. However, it is clear that baths with a lower phosphorus content or pure nickel baths may also be used.
When the second material is NiP, preferably with a medium or high phosphorous content, the method according to the invention may further comprise a heat treatment step c) of the layer 5 of the second material, performed after the deposition step b). This heat treatment enables to obtain a layer 5 of the second material having a hardness preferably comprised between 900HV and 1000 HV.
The electroless nickel deposition method is particularly advantageous in that it enables a proper deposition to be obtained without the occurrence of peak effects. The dimensions of the bar turned pivot spindle can thus be expected to obtain the desired geometry after covering the layer of the second material.
The electroless nickel deposition method also has the advantage of being capable of being applied in bulk.
In order to enhance the resistance of the layer of the second material, the method according to the invention may further comprise a step d) of applying at least one adhesion sublayer on the first material, carried out before the deposition step b). For example, a sublayer of gold and/or a sublayer of electroplated nickel may be applied prior to electroless nickel deposition, particularly where the pivot spindle is made of high gap stainless steel.
The pivot spindle according to the invention may comprise pivots treated according to the invention by applying step b) only to the pivots or may be made entirely of a first non-magnetic metal material, the outer surface of which may be entirely covered with a layer of a second material by applying step b) over the entire surface of the pivot spindle.
The pivot portion 3 may be rolled or polished in a known manner before or after the deposition step b) to achieve the desired dimensions and final surface finish of the pivot portion 3.
The pivot spindle according to the invention combines the advantages of low sensitivity to magnetic fields and excellent impact resistance at least in the main stress areas. The pivot arbour according to the invention therefore does not present any markings or any serious damage that could affect the timing of the movement in the event of an impact.
The following examples illustrate the invention, but do not limit its scope accordingly.
The pivot spindle made of HIS is manufactured in a known manner. The untreated mandrel had a hardness of 600 HV.
The method according to the invention is carried out on a batch of these pivoting spindles covered with a layer of NiP equal to 1.5 μm in thickness, obtained from a commercial electroless nickel plating bath using hypophosphite.
The pivot spindles according to the invention have a hardness of 500 HV.
All pivoting arbours are subjected to the same standard impact procedure in the horological field. The untreated mandrels without NiP layers were marked as shown in fig. 3. The mandrels covered with the NiP layer according to the invention remain unchanged, as shown in fig. 4. The pivot spindle according to the invention combines the advantages of low sensitivity to magnetic fields and excellent shock resistance.

Claims (22)

1. A pivoting arbour (1) for a timepiece movement, comprising at least one pivot (3) at least one end thereof, this pivot (3) being made of a first non-magnetic metallic material (4) so as to limit its sensitivity to magnetic fields, said first non-magnetic metallic material (4) being selected from the group comprising: austenitic steel, austenitic cobalt alloy, austenitic nickel alloy, titanium alloy, aluminium alloy, copper zinc based brass, copper beryllium alloy, nickel silver alloy, bronze, aluminium bronze, copper aluminium alloy, copper nickel tin alloy, copper nickel silicon alloy, copper nickel phosphorus alloy, copper titanium alloy, characterized in that at least the outer surface of the pivot part (3) is covered with a layer (5) of a second material being NiP in order to improve the impact resistance of the pivot spindle.
2. A pivot spindle (1) according to claim 1, characterized in that the second material is chemical NiP.
3. The pivoting spindle (1) according to claim 1, characterized in that the pivoting spindle (1) is made of a first non-magnetic metal material in order to limit its sensitivity to magnetic fields; and the outer surface of the pivot spindle (1) is covered with the layer of the second material.
4. A pivot spindle (1) according to claim 3, characterized in that the second material is chemical NiP.
5. A pivot spindle (1) according to claim 1, characterized in that the first non-magnetic metal material (4) has a hardness below 600 HV.
6. The pivoting spindle (1) according to claim 1, characterised in that the layer (5) of the second material has a thickness of between 0.5 μm and 10 μm.
7. The pivot spindle (1) according to claim 6, characterized in that the layer (5) of the second material has a thickness between 1 μm and 5 μm.
8. The pivoting spindle (1) according to claim 7, characterized in that the layer (5) of the second material has a thickness between 1 μm and 2 μm.
9. A pivoting spindle (1) according to claim 1, characterised in that the layer (5) of the second material has a hardness higher than 400 HV.
10. A pivot spindle (1) according to claim 9, characterized in that the layer (5) of the second material has a hardness higher than 500 HV.
11. The pivot spindle (1) according to claim 1, characterized in that the first non-magnetic metal material (4) is austenitic stainless steel and the layer (5) of the second material is a chemical NiP layer.
12. A timepiece movement comprising a pivoting arbour (1), said pivoting arbour (1) comprising at least one pivot (3) at least one end thereof, this pivot (3) being made of a first non-magnetic metallic material (4) so as to limit its sensitivity to magnetic fields, said first non-magnetic metallic material (4) being selected from the group comprising: austenitic steel, austenitic cobalt alloy, austenitic nickel alloy, titanium alloy, aluminium alloy, copper zinc based brass, copper beryllium alloy, nickel silver alloy, bronze, aluminium bronze, copper aluminium alloy, copper nickel tin alloy, copper nickel silicon alloy, copper nickel phosphorus alloy, copper titanium alloy, characterized in that at least the outer surface of the pivot part (3) is covered with a layer (5) of a second material being NiP in order to improve the impact resistance of the pivot spindle.
13. The timepiece movement of claim 12, wherein the second material is chemical NiP.
14. Timepiece movement, characterized in that it comprises a balance staff, a fork staff and/or an escapement pinion with a pivoting arbour (1), said pivoting arbour (1) comprising at least one pivot (3) at least one of its ends, this pivot (3) being made of a first non-magnetic metallic material (4) so as to limit its sensitivity to magnetic fields, said first non-magnetic metallic material (4) being selected from the group comprising: austenitic steel, austenitic cobalt alloy, austenitic nickel alloy, titanium alloy, aluminium alloy, copper zinc based brass, copper beryllium alloy, nickel silver alloy, bronze, aluminium bronze, copper aluminium alloy, copper nickel tin alloy, copper nickel silicon alloy, copper nickel phosphorus alloy, copper titanium alloy, at least the outer surface of the pivot part (3) is covered with a layer (5) of a second material being NiP to improve the impact resistance of the pivot spindle.
15. The timepiece movement of claim 14, wherein the second material is chemical NiP.
16. A method for manufacturing a pivoting arbour (1) for a timepiece movement, comprising the steps of:
a) forming a pivot spindle (1) comprising at least one pivot (3) at least one end thereof, the pivot (3) being made of a first non-magnetic metallic material (4) to limit its sensitivity to magnetic fields, said first non-magnetic metallic material (4) being selected from the group comprising: austenitic steel, austenitic cobalt alloy, austenitic nickel alloy, titanium alloy, aluminum alloy, copper zinc-based brass, copper beryllium alloy, nickel silver alloy, bronze, aluminum bronze, copper aluminum alloy, copper nickel tin alloy, copper nickel silicon alloy, copper nickel phosphorus alloy, copper titanium alloy;
b) depositing a layer (5) of a second material on at least the outer surface of the pivot (3), the second material being NiP, to improve the impact resistance of the pivot spindle.
17. Method according to claim 16, characterized in that said layer (5) of second material is deposited with a thickness comprised between 0.5 μ ι η and 10 μ ι η.
18. Method according to claim 17, characterized in that said layer (5) of second material has a thickness comprised between 1 μm and 5 μm.
19. Method according to claim 18, characterized in that said layer (5) of second material has a thickness comprised between 1 and 2 μm.
20. Method according to claim 16, characterized in that step b) of depositing the layer (5) of the second material is carried out by a method selected from the group comprising: PVD, CVD, ALD, electroplating and chemical deposition.
21. The method according to claim 20, characterized in that step b) of depositing the NiP layer is realized by a process of electroless nickel deposition using hypophosphite.
22. Method according to claim 16, characterized in that it further comprises a heat treatment step c) carried out on the layer (5) of second material after step b).
CN201710584919.3A 2016-07-19 2017-07-18 Component for a timepiece movement Active CN107632508B (en)

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Applications Claiming Priority (6)

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EP16180226.9A EP3273304B1 (en) 2016-07-19 2016-07-19 Part for clock movement
EP16180226.9 2016-07-19
EP16190278.8 2016-09-23
EP16190278.8A EP3273306A1 (en) 2016-07-19 2016-09-23 Part for clock movement
EP17157065.8 2017-02-21
EP17157065.8A EP3273307A1 (en) 2016-07-19 2017-02-21 Part for clock movement

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EP3273306A1 (en) 2018-01-24
CN107632507B (en) 2021-01-08

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