Assembly of a part that has no plastic domain

Patent metadata

Field	Value
Publication number	US-9128463-B2
Application number	US-201113995052-A
Country	US
Kind code	B2
Filing date	Nov 22, 2011
Priority date	Dec 22, 2010
Publication date	Sep 8, 2015
Grant date	Sep 8, 2015

Abstract

An assembly of an axially extending member, made of a first material, in an aperture of a part, made of a second material having no plastic domain. The part includes pierced holes forming an elastic deformation mechanism distributed around the aperture thereof. Further, the member includes an elastically and plastically deformed, radially flared portion that radially grips a wall of the part surrounding the aperture by stressing the elastic deformation mechanism, so as to secure the assembly in a manner that is not destructive for the part. The assembly can be used in the field of timepieces.

First claim

The invention claimed is:

1. A method of assembling an axially extending member made of a first material in a part made of a second material having no plastic domain, comprising:
a) forming the part with an aperture and pierced holes distributed around the aperture intended to form elastic deformation means;
b) inserting a radially flared portion of said member into the aperture without any stress;
c) elastically and plastically deforming the flared portion of said member in the aperture by moving two tools towards each other axially, respectively on top and bottom parts of said flared portion, so as to exert a radial stress against the wall of the part surrounding the aperture, by stressing said elastic deformation means of the part, in order to secure the assembly in a manner that is not destructive for said part.

2. The method according to claim 1 , wherein a shape of an external wall of the flared portion of said member substantially matches the aperture of the part, so as to exert a substantially uniform radial stress on the wall of the part surrounding the aperture.

3. The method according to claim 1 , wherein the aperture of the part is circular.

4. The method according to claim 1 , wherein the aperture of the part is asymmetrical to prevent any relative movement between elements of said assembly.

5. The assembly method according to claim 1 , wherein, in b), the difference between the section of the circular aperture and the external section of the flared portion of said member in the aperture is approximately 10 μm.

6. The assembly method according to claim 1 , wherein, in c), the deformation exerts a clamping force which generates a displacement comprised between 8 and 20 μm.

7. The assembly method according to claim 1 , wherein, in b) and c), the flared portion of the member in the aperture is held in the aperture via one of the two tools.

8. The assembly method according to claim 1 , wherein the second material is silicon-based.

9. The assembly method according to claim 1 , wherein the first material is formed from a metal or metal alloy base.

10. The assembly method according to claim 1 , wherein the part is a timepiece wheel set.

11. The assembly method according to claim 1 , wherein the part is timepiece pallets.

12. The assembly method according to claim 1 , wherein the part is a timepiece balance spring.

13. The assembly method according to claim 1 , wherein the part is a resonator.

14. The assembly method according to claim 1 , wherein the part is a MEMS.

Assignees

• Conus Thierry
• Verardo Marco
• Saglini Igor
• Kohler Frederic
• Eta Sa Mft Horlogere Suisse

Inventors

• Conus Thierry
• Verardo Marco
• Saglini Igor
• Kohler Frederic

Classifications

• G04B13/022 Primary

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

• G04B15/14

  Component parts or constructional details, e.g. construction of the lever or the escape wheel {(assembly and manufacture of the spring G04B1/145; assembly and manufacture of components, e.g. pinions, spindles G04B13/02; lubrication of clockwork bearings G04B31/008; oils for clockwork bearings in general G04B31/08)} · CPC title

• G04B17/325

  for fastening the hairspring in a fixed position, e.g. using a block · CPC title

• G04B13/026

  Physics · mapped topic

• G04B17/345

  Details of the spiral roll · CPC title