Method for producing friction by indenting

Patent metadata

Field	Value
Publication number	US-11256216-B2
Application number	US-201916552141-A
Country	US
Kind code	B2
Filing date	Aug 27, 2019
Priority date	Sep 3, 2018
Publication date	Feb 22, 2022
Grant date	Feb 22, 2022

Abstract

A method for producing a tube (1) for a friction system comprising the tube (1) and an arbor (2), in particular a tube provided to rub around a pinion arbor, the method comprising a first stage of plastic deformation of the tube, in particular a first stage of plastic deformation of the tube that is controlled in deformation, followed by a second stage of hardening of the tube, in particular hardening by heat treatment.

First claim

The invention claimed is:

1. A method for producing a tube for a friction system comprising the tube and an arbor, the method comprising:
performing plastic deformation of the tube,
followed by performing hardening the tube, and
providing a tube obtained by the implementation of the method and an assembly comprising an arbor and the tube, wherein a diameter of the arbor is less than or equal to 2 mm.

2. The method according to claim 1 , wherein
said performing plastic deformation of the tube includes the deformation being performed on a portion of the tube wherein at least one of the following:
the portion of the tube is in an annealed condition,
the portion of the tube has an elastic limit of less than 1000 MPa,
the portion of the tube has a hardness of less than 400 HV.

3. The method according to claim 1 , wherein the tube is a tube of a cannon pinion or a clutch element or a torque limiter element.

4. The method according to claim 1 , wherein the deformation is performed by pinching the tube.

5. The method according to claim 1 , wherein the deformation is performed on a tube made of 20AP alloy or Finemac alloy having a hardness of less than or equal to 400 Hv.

6. The method according to claim 1 , wherein the deformation is controlled by at least one of the following:
optical measurement of the deformation,
a template arranged in the tube during the deformation,
passing through gauges.

7. The method according to claim 1 , wherein the deformation is performed on a portion of the tube having an elongation at break greater than or equal to 2%.

8. A method for producing a tube for a friction system comprising the tube and an arbor, the method comprising:
performing plastic deformation of the tube,
followed by performing hardening the tube, and
providing a set of at least 500 tubes obtained by the implementation of the method, wherein a standard deviation of diameters of circles centered on axes of the tubes and inscribed within straight sections of the tubes at a level of peaks of bulges is less than 0.2 micrometers.

9. The method as claimed in claim 1 , wherein a friction torque between the arbor and the tube is greater than or equal to 1.8 mNm.

10. The method as claimed in claim 1 , further including providing a watch movement comprising the assembly.

11. The method as claimed in claim 10 , further including providing a timepiece comprising the movement.

12. The method as claimed in claim 1 , wherein the tube is adapted to rub around a pinion arbor.

13. The method as claimed in claim 1 , wherein the plastic deformation is controlled in deformation.

14. The method as claimed in claim 1 , wherein the hardening is performed by heat treatment.

15. The method as claimed in claim 2 , wherein the tube is adapted to rub around a pinion arbor.

16. The method as claimed in claim 2 , wherein the portion of the tube has a hardness is of less than 350 HV.

17. The method according to claim 2 , wherein the tube is a tube of a cannon pinion or a clutch element or a torque limiter element.

18. A method for producing a tube for a friction system comprising the tube and an arbor, the method comprising:
performing plastic deformation of the tube, followed by performing hardening the tube,
wherein the deformation is performed on a tube made of 20AP alloy or Finemac alloy having a hardness of less than or equal to 400 Hv.

19. A method for producing a tube for a friction system comprising the tube and an arbor, the method comprising:
performing plastic deformation of the tube,
followed by performing hardening the tube, and
providing a tube obtained by the implementation of the method and an assembly comprising an arbor and the tube, wherein a friction torque between the arbor and the tube is greater than or equal to 1.8 mNm.

Assignees

• Rolex Sa

Inventors

• Javet Jérôme
• Prenez Christian

Classifications

• G04B19/02

  Back-gearing arrangements between gear train and hands {(transmissions in general G04B13/00)} · CPC title

• G04B13/021

  elastic fitting with a spindle, axis or shaft · CPC title

• G04B13/02 Primary

  Wheels; Pinions; Spindles; Pivots (bearings G04B31/00 {; chain wheels, spindles for chain wheels, also chains and driving weights G04B1/08}) · CPC title

• G04B13/022

  with parts made of hard material, e.g. silicon, diamond, sapphire, quartz and the like · CPC title

• G04B11/003 Primary

  with friction member, e.g. with spring action · CPC title