Method for manufacturing an exhaust anchor

Abstract

The present invention relates to a method for manufacturing an anchor for an escapement system.

Description

Technical field of the invention

[0001] The invention relates to the field of watchmaking. More specifically, it concerns a method for manufacturing a watch component, in particular an escapement anchor for a watch part. Technological background

[0002] In the watchmaking industry, some applications require the use of complex components that necessitate numerous machining operations.

[0003] This is the case, for example, with anchors, which require numerous machining operations using several machines during laser cutting. Such a method may necessitate reworking parts after their manufacture, which is costly and time-consuming.

[0004] Escapement anchors can also be manufactured via stamping, but in the case of small series production such a method is very expensive and therefore not very attractive.

[0005] One aim of the present invention is therefore to propose a simpler manufacturing process, allowing to limit the rework of manufactured parts, while limiting itself to a single machine for machining the anchors. Summary of the invention

[0006] To this end, the present invention relates to a method for manufacturing an anchor for an escapement system.

[0007] According to the invention, the process comprises the following steps: a) Take a metal or metal alloy strip and drill pilot holes in the strip to guide it; b) Mill the strip to form lugs; c) Bevel the body of the anchor, one end of which has the lugs and the other end has two arms, the bevel being made in a portion of the strip's thickness so that the anchor body remains attached to the strip; d) Mill the outer casing of the anchor body, the milling being made in the same portion of the strip's thickness as in the previous step; e) Mill a rough notch in each of the arms, the notches being intended to receive a pallet, and in the same step, mill a rough fork; f) Finish the notches and the fork using a broaching tool;g) perform a laser cutting of the anchor obtained in the thickness of the remaining strip to detach the anchor from the strip. ;

[0008] In accordance with other advantageous variants of the invention: in step f), broaching is carried out only in an axial direction; in step f), at least two lateral passes are made to obtain a specified width; in step e), a shank hole and a dart hole are also drilled; in step e), milling is carried out over the entire thickness of the strip; the process includes a step h) in which pallets and a shank are mounted on the anchor; the broaching tool is made of a hard metal.

[0009] The invention also relates to an anchor for an escapement system obtained by means of the process according to the invention. Brief description of the drawings

[0010] Other features and advantages of the invention will become apparent upon reading the detailed description that follows, with reference to the attached drawings, where: there figure 1 represents an anchor obtained via the process according to the invention; the figures 2 to 6a illustrate the different stages of the manufacturing process according to the invention. Detailed description of the invention

[0011] The invention relates to the manufacture of an anchor for an escapement system.

[0012] The anchor 1 generally includes a rod 2 formed from a metallic material which may be, for example, carbon steel (e.g. 20AP, 15P, Ck75 or Ck101), titanium, aluminum, a cobalt-based alloy of austenitic structure, a brass alloy (e.g. CuZn42), or a copper alloy (e.g. CuBe2 or nickel silver (CuNi1820)).

[0013] The baguette 2 has arms 20 and 21 designed to support the pallets in order to cooperate with at least one escape wheel (not shown) of an escapement system. Between these two arms 20 and 21, an anchor rod is mounted in a hole 22 to pivotally mount the anchor 1. Finally, at the end opposite the arms 20 and 21, the baguette 2 has a fork 5 with two horns 50 and 51.

[0014] In the example illustrated in the figure 1 One can observe a classic anchor for a watch part. Of course, other types of anchors, such as a side anchor, can be manufactured using the process described below.

[0015] The manufacturing process for an anchor 1 according to the invention will now be described in relation to the figures 2 to 6a .

[0016] The first step a) of the process, illustrated in the figure 2, consists of using a metallic or metallic alloy strip 10, of thickness e, in which pilot holes 11 are cut to guide and move the strip 10 along a conveyor (not shown in the figures).

[0017] The next step b), illustrated in the figure 3 , consists of making a milling 12 in the strip 10, the milling 12 being made to a depth less than the thickness e of the strip, and at least half the thickness e of the strip, to form horns 50, 51 of the anchor.

[0018] The third step c) of the process, illustrated in Figures 4 and 4a , consists of performing an angling to form the body of the anchor, one end of which has the horns 50, 51 and the other end has two arms 20, 21. The angling is carried out over a depth equivalent to half the thickness e of the band so that the body of the anchor is always attached to the band at the end of the step.

[0019] The fourth step d) of the process consists of milling the outer shell of the anchor body, the milling also being carried out to a depth less than the thickness of the band, and at least to two-thirds of the thickness e of the band, to keep the anchor body attached to the band.

[0020] The fifth step e), illustrated in Figures 5 and 5a This step involves milling a rough notch 3, 4 into each of the arms 20, 21, and in the same step milling a rough fork 5. During this step, the milling of the notches 3, 4 and the fork 5 is carried out across the entire thickness e of the strip 10. In step e), a stem hole 22 and a dart hole 23 are also drilled.

[0021] The sixth step (f), illustrated in the figure 6This involves reworking notches 3 and 4 and the fork 5 using a broaching tool. Broaching is performed only in an axial direction, and at least two lateral passes are made to achieve a predetermined width for notches 3 and 4. This step allows for the desired angles to be obtained at the bottom of the notches, as milling alone cannot achieve the desired angles due to the excessively large cutter radius.

[0022] Finally, step seven (g) involves laser-cutting the resulting anchor through the remaining strip thickness to detach the anchor from the strip. Alternatively, a stamp can be used to detach the anchor from the strip.

[0023] The process may also include a step h) in which pallets and a rod are mounted on the anchor.

[0024] The invention also relates to an anchor obtained according to the process according to the invention.

Claims

1. Method for manufacturing an anchor (1) for an escapement system, characterized in thatIt comprises the following steps: a) obtaining a metal or metal alloy strip (10) of a thickness (e), and forming pilot holes (11) in the strip (10) to guide the strip; b) milling (12) into the strip (10), over at least half the thickness (e) of the strip (10), to form lugs (50, 51); c) angling to form the body of the anchor (2) having one end comprising the lugs (50, 51) and a second end comprising two arms (20, 21), the angling being carried out over at least half the thickness (e) of the strip, so that the body of the anchor is always integral with the strip; d) milling the outer casing of the body of the anchor (2), the milling being carried out over two-thirds of the thickness (e) of the strip;e) to perform, by milling, over the entire thickness (e) of the strip, a rough notch (3, 4) in each of the arms (20, 21), the notches (3, 4) being intended to each receive a pallet, and to perform, during the same step, a rough fork (5) by milling; f) to perform a finishing of the notches (3, 4) and the fork (5) by means of a broaching tool; g) to perform a laser cutting of the anchor obtained in the thickness of the remaining strip to detach the anchor from the strip.

2. Method for manufacturing an anchor according to claim 1, characterized in that During step f), the pinning is carried out only in one axial direction.

3. Method for manufacturing an anchor (1) according to claim 1 or 2, characterized in that In step f), at least two lateral passes are performed to obtain a specified width.

4. Method for manufacturing an anchor (1) according to any one of the preceding claims, characterized in thatin step e), a stem hole (22) and a dart hole (23) are also drilled.

5. Method for manufacturing an anchor (1) according to any one of the preceding claims, characterized in that In step e), milling is carried out across the entire thickness of the strip.

6. Method for manufacturing an anchor (1) according to any one of the preceding claims, characterized in that It includes a step h) during which pallets and a rod are assembled.

7. Method for manufacturing an anchor (1) according to any one of the preceding claims, characterized in that The broaching tool is made of a hard metal.

8. Anchor (1) obtained by the process according to any one of claims 1 to 7.

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