Component fabrication method including a modified burnishing step

Patent metadata

Field	Value
Publication number	US-10564606-B2
Application number	US-201615162763-A
Country	US
Kind code	B2
Filing date	May 24, 2016
Priority date	Jun 16, 2015
Publication date	Feb 18, 2020
Grant date	Feb 18, 2020

Abstract

The invention relates to a fabrication method for a part intended to be welded comprising a burnishing step for forming a perpendicular wall with respect to the surface undergoing burnishing intended to improve the flatness of the face to be welded.

First claim

What is claimed is:

1. A method for fabrication of a timepiece component comprising:
selecting a metal bar;
forming at least one diameter portion including a substantially vertical surface and a substantially horizontal surface based on a profile turning of the metal bar;
forming a first metal part based on a burnishing of the metal bar, the burnished metal bar having increased hardness and improved surface state than the metal bar, wherein a burnisher is moved along the substantially vertical surface of the at least one diameter portion until the burnisher is in contact with the substantially horizontal surface of the at least one diameter portion, and the substantially horizontal surface of the at least one diameter portion is polished when the burnisher is moved away from the substantially vertical surface of the at least one diameter portion;
mounting a surface of the first metal part on a surface of a second part; and
welding, by laser electromagnetic radiation, the surface of the metal first part mounted on the surface of the second part, the first metal part being secured to the second part.

2. The method according to claim 1 , wherein the second part includes silicon or ceramic.

3. The method according to claim 2 , wherein the second part further includes at least a partial coating of metal, silicon oxide, silicon nitride, silicon carbide or an allotrope of carbon.

4. The method according to claim 1 , wherein the first metal part is made from a metal includes ail iron alloy, a copper alloy, nickel or an alloy thereof, titanium or an alloy thereof, gold or an alloy thereof, silver or an alloy thereof platinum or an alloy thereof ruthenium or an alloy thereof, rhodium or an alloy thereof, or palladium or art alloy thereof.

5. The method according to claim 1 , wherein a side face of the burnisher is configured to polish the substantially horizontal surface of the at least one diameter portion.

6. The method according to claim 1 , wherein the at least one diameter portion is configured to receive a balance spring, a balance Wheel, and a table-roller of the timepiece component.

7. The method according to claim 1 , wherein the at least one diameter portion further includes a cylindrical shaft and a shoulder, a lower portion of the cylindrical shaft being edged with the shoulder.

8. The method according to claim 1 , wherein a side face of the burnisher is configured to polish the substantially horizontal surface of the at least one diameter portion.

9. The method according to claim 1 , wherein the first metal part is a balance staff.

10. The method according to claim 1 , wherein the second part is a collet.

Assignees

• Nivarox Sa

Inventors

• Cusin Pierre
• Cretenet Davy
• Stranczl Marc
• Garret Raphael

Classifications

• G04B17/32

  Component parts or constructional details, e.g. collet, stud {, virole or piton} · 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

• G04B17/066

  Manufacture of the spiral spring (locking of the spiral spring by the regulating lever G04B18/026; spiral spring with temperature compensation G04B17/227; fixation of the spiral spring on the collet G04B17/32; mainspring G04B1/14) · 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

• B23K2103/18

  Dissimilar materials · CPC title