CH720017A2 - Method of manufacturing at least one barrel spring and said barrel spring - Google Patents

Abstract

The present invention relates to a method of manufacturing at least one barrel spring (4) comprising the following steps: a) providing at least one semi-finished barrel ring-spring assembly (18) in which a barrel spring semi-finished barrel (4') is wound into turns in the center of a conditioning ring (16) so as to present two accessible parallel main faces (14a, 14b), formed respectively by the edges of the wound turns; b) temporarily fix the barrel ring-spring assembly (18) provided in step a) on a support (20) so as to expose one of the main faces (14a, 14b) of the barrel spring ( 4') semi-finished; c) polishing the main face (14a, 14b) of the semi-finished barrel spring (4') exposed according to step b); d) separate the barrel ring-spring assembly (18) obtained in step c) from the support (20); e) to g) reproduce steps b) to d) with the other main face (14a, 14b) of the semi-finished barrel spring (4'); h) remove the barrel spring (4) obtained in step g) from its conditioning ring (16); i) lubricate the barrel spring (4) obtained in step h); j) replace the barrel spring (4) lubricated according to step i) in its conditioning ring (16) to recondition it into a finished barrel ring-spring assembly (18), steps h) to j) being optional .

Description

Technical area

The present invention relates to a method of manufacturing at least one barrel spring.

[0002] The present invention also relates to said barrel spring, a method of manufacturing a watch barrel and said watch barrel comprising such a barrel spring.

State of the art

[0003] A barrel spring is the driving spring of a timepiece making it possible to store energy when it is tensioned, and to release it when it is released. Most of the time it is a blade or a metal ribbon wound in a spiral formed by a certain number of turns. The mainspring is housed in the barrel drum. It is fixed to the barrel drum by its outer turn and to the barrel shaft at the level by its inner turn.

[0004] Once the ribbon is wound into turns, the lower and upper edges of the turns form the two main faces of the barrel spring, parallel to each other, one of the main faces coming into contact with the bottom of the drum barrel, the other of the main faces coming into contact with the cover which closes the barrel.

[0005] Different methods of manufacturing such a barrel spring have been developed to improve the properties of the barrel and its spring.

[0006] For example various documents, such as patents DE 1020110014784, US 3346938, FR 1138087, propose to produce the barrel spring in the form of a ribbon, to polish the edges of the ribbon, then to wind it tape in the form of a coiled barrel spring. When polishing the edges of the ribbon, defects, such as microcracks or other structural defects, which appear in particular locally on the edges of the ribbon and which can constitute breaking points in the wound spring under tension, are removed. Polishing the edges of the ribbon therefore makes it possible to reduce the risk of cracking, to improve fatigue resistance, to reduce the friction forces between the edges of the turns and the drum and/or the cover, to increase the reserve of walking, etc.

However, polishing the edges of the ribbon as described in these documents is complex to implement.

[0008] Other solutions for improving the properties of a watch barrel have also been proposed. For example, patent JP6876559 describes a method for manufacturing a barrel in which the bottom of the drum and/or the interior face of the cover are polished to have low roughness to reduce friction with the edges of the barrel spring. Patent EP322608 describes a barrel in which the surfaces in contact comprise a coating of amorphous carbon in order to reduce friction between them.

[0009] However, as part of the process of continuous improvement in the field of watchmaking, it is necessary to propose other solutions to continue to improve the properties of the watch barrel and its barrel spring, essential elements for the operation of mechanical watches, using a manufacturing process that is simple to implement.

Disclosure of the invention

[0010] For this purpose, the invention relates to a method of manufacturing at least one barrel spring comprising the following steps: a) providing at least one semi-finished barrel ring-spring assembly in which a spring of semi-finished barrel is wound into turns in the center of a conditioning ring so as to present two accessible parallel main faces, formed respectively by the edges of the wound turns; b) temporarily fix the barrel ring-spring assembly provided in step a) on a support so as to expose one of the main faces of the semi-finished barrel spring; c) polishing the main face of the semi-finished barrel spring exposed according to step b); d) separate the barrel ring-spring assembly obtained in step c) from the support; e) temporarily fix the barrel ring-spring assembly obtained in step d) on the support so as to expose the other main face of the semi-finished barrel spring; f) polishing the main face of the semi-finished barrel spring exposed according to step e); g) separate the barrel ring-spring assembly obtained in step f) from the support; h) remove the barrel spring obtained in step g) from its conditioning ring; i) lubricate the barrel spring obtained in step h); j) replace the barrel spring lubricated according to step i) in its conditioning ring to recondition it into a finished barrel ring-spring assembly, steps h) to j) being optional.

[0011] In an unexpected and surprising manner, the method of manufacturing a barrel spring according to the present invention makes it possible in particular to obtain, after at least one of steps c) and f), a finished barrel spring for which the edges of the turns have a roughness Ra less than or equal to 0.2 µm, and preferably less than or equal to 0.1 µm, preferably less than or equal to 50 nm, preferably less than or equal to 25 nm, preferably less than or equal at 10 nm, preferably less than or equal to 5 nm, and preferably less than or equal to 2 nm.

[0012] This very low roughness Ra of the edges of the turns of the barrel spring makes it possible to obtain a barrel spring having in particular improved tribological properties, according to a manufacturing process that is easy to implement. Furthermore, the roughness obtained makes it possible to reduce the onset of fracture due to higher roughness values (rupture which begins in very small cavities and/or crevices found in rougher surface states). One of the benefits lies in the increase in fatigue resistance and the lifespan of the component. Another benefit is that of the potential increase in the power reserve since the energy dissipation due to friction between the edges of the spring and the other components is greatly reduced.

[0013] Advantageously, the barrel ring-spring assembly is temporarily fixed to the support according to at least one of steps b) and e) by gluing.

[0014] Preferably, at least one of steps c) and f) of polishing the main faces of the barrel spring is carried out by means of at least one polishing disk, said at least one disk preferably being made of felt .

[0015] Advantageously, the barrel ring-spring assembly is temporarily fixed on the support according to at least one of steps b) and e) by means of glue, step d) and g ) respective separation of the barrel ring-spring assembly from the support being carried out by dissolution of said glue.

[0016] In a preferred embodiment, in step a), several semi-finished barrel ring-spring assemblies are provided, at least in one of steps b) and e), said several assemblies barrel spring ring are fixed on the same support, at least in one of steps c) and f), the exposed main faces of the barrel springs of all barrel spring ring assemblies fixed on the support are polished before to separate the barrel ring-spring assemblies from the support according to at least one of steps d) and g).

[0017] This embodiment makes it possible to process a large number of ring-spring assemblies at the same time.

[0018] The present invention also relates to a method of manufacturing a watch barrel comprising the manufacture of a barrel spring according to the method as defined above.

The present invention also relates to a barrel spring obtained by the method of manufacturing a barrel spring as defined above.

The present invention also relates to a watch barrel comprising such a barrel spring.

Brief description of the drawings

[0021] Other characteristics and advantages of the present invention will appear on reading the following detailed description of an embodiment of the invention, given by way of non-limiting example, and made with reference to the drawings appended in which: – Figure 1 is an exploded view representing a barrel; – Figure 2 represents an isometric view of a barrel spring; – Figure 3 is an isometric view of a barrel ring-spring assembly; and – Figure 4 is a schematic representation of the steps of a method according to the invention.

Modes of carrying out the invention

[0022] The present invention relates in particular to a method of manufacturing at least one barrel spring intended to be used in a watch barrel.

With reference to Figure 1, there is shown such a watch barrel 1 comprising a barrel drum 2, a barrel spring 4 manufactured according to the method of the invention, a barrel shaft 6 and a barrel cover 8 , with axis of rotation A.

[0024] With the exception of the treatment of the barrel spring specific to the invention, the construction of each of these elements, their functions and their assembly to form a watch barrel 1 are well known to those skilled in the art and do not require no detailed description here.

The barrel spring 4, finished within the meaning of the invention, is obtained from a semi-finished barrel spring 4' as will be detailed below. With the exception of processing the semi-finished barrel spring 4' to obtain the finished barrel spring 4 specific to the invention, the finished barrel spring 4 is similar to the semi-finished barrel spring 4'. Figure 2 therefore represents both the finished barrel spring 4 and the semi-finished barrel spring 4'.

[0026] With reference to Figure 2, the finished barrel spring 4 or the semi-finished barrel spring 4' is obtained from a blade or a metal strip, the blade having an external face 10a and an internal face 10b extending generally along the axis A, of height h comprised for example between 0.4 mm and 4 mm. The faces 10a, 10b of the blade are connected to each other by two edges, an upper edge 12a and a lower edge 12b in the configuration shown in the drawings, substantially parallel, extending perpendicular to the axis A , and corresponding to the thickness e of the blade, for example between 0.05 mm and 0.3 mm. The blade, seen in section along axis A, may have a section of polygonal shape, for example rectangular, or elliptical. The blade may have, unrolled, a length of, for example, between 200 m and 2000 m.

The blade may for example be made of stainless steel or a Cobalt/Nickel alloy or any other suitable material.

[0028] During the manufacture of the semi-finished barrel spring 4', the blade is wound according to a standard process around the axis A in a spiral formed by a certain number of turns. Thus, the wound barrel spring 4 or 4' has, in the configuration shown in the drawings, an upper main face 14a in the plane P of which is located all of the upper edges 12a of the wound turns and a lower main face 14b in the plane P' of which there are all the lower edges 12b of said turns, the main upper 14a and lower 14b faces being parallel. The upper, respectively lower edges of the wound turns correspond to the upper edge 12a, respectively lower 12b of the unrolled blade, as defined above. The upper main face 14a of the barrel spring 4 or 4' is intended to be as close as possible to the inside of the barrel cover 8, to which it is parallel, and the lower main face 14b of the barrel spring 4 or 4' is intended to be as close as possible to the bottom of the barrel drum 2, to which it is parallel.

[0029] With a view to its use in the implementation of step a) of the method of the invention, the semi-finished barrel spring 4' is packaged, in a known manner, wound into turns in a ring conditioning 16 to form a semi-finished barrel ring-spring assembly 18, shown in Figure 3.

[0030] With a view to its use for the manufacture of a barrel, the finished barrel spring 4 is also packaged, in a known manner, wound into turns in a conditioning ring 16 to form a ring-spring assembly. barrel 18 finished.

[0031] With the exception of the treatment of the semi-finished barrel spring 4' to obtain the finished barrel spring 4 specific to the invention, the ring-barrel spring assembly 18 comprising the finished barrel spring 4 is similar to the semi-finished barrel ring-spring assembly 18 including the semi-finished barrel spring 4'. Figure 3 therefore represents both the finished barrel ring-spring assembly and the semi-finished barrel ring-spring assembly.

[0032] The barrel spring 4 or 4' is positioned wound in the center of the conditioning ring 16 so that its main faces 14a and 14b, formed respectively by the upper edges 12a and lower 12b of the wound turns as defined below above, are presented in an accessible manner, in the center of the conditioning ring 16.

[0033] Traditionally, the barrel spring 4 or 4' has a height h greater than the height of its conditioning ring 16 and is positioned in said conditioning ring 16 preferably centered at mid-height, its main faces 14a and 14b protruding from the corresponding side of the ring. The conditioning ring 16 is for example made of aluminum.

According to the known standard manufacturing process, traditionally used until now, the barrel spring, once packaged in a barrel ring-spring assembly as described above, is ready for use. Typically, the mainspring has been lubricated before being placed in the center of its conditioning ring. In particular, its main faces intended to be in contact with the drum and the barrel cover are lubricated.

[0035] In the method of manufacturing at least one barrel spring according to the present invention, and with reference to Figure 4, step a) consists of providing at least one semi-finished barrel ring-spring assembly 18 , that is to say a barrel ring-spring assembly 18 comprising a semi-finished barrel spring 4' as described above, in which said semi-finished barrel spring 4' has edges, for example raw rolling or ground before winding, but preferably without prior lubrication.

[0036] Thus, the semi-finished barrel ring-spring assembly 18 supplied in step a) was previously prepared according to a known standard manufacturing process, but preferably without lubrication. As described above, the semi-finished barrel spring 4' is wound in turns in the center of its conditioning ring 16 so as to present its two main faces 14a and 14b accessible, according to the configuration shown in the drawings, said faces main edges 14a and 14b being formed by all of the upper edges 12a, respectively the lower edges 12b of the wound turns. The barrel spring 4' used in step a), unlike the known manufacturing process, is semi-finished because it will benefit from other modifications according to the subsequent stages of the process of the invention to result in a barrel spring 4 finished, as described below.

Then, according to step b) of the method of the invention, said at least one semi-finished barrel ring-spring assembly 18 provided in step a) is temporarily fixed on a support 20, such as than a plate, so as to expose one of the main faces of the semi-finished barrel spring 4', here the upper main face 14a, for the implementation of the following step c).

[0038] Advantageously, the barrel ring-spring assembly 18 is temporarily fixed on the support 20 by gluing, for example by means of a temporary glue, of the resin type, which can be easily removed by for example by washing, preferably in a bath, with chemicals common in industry. Advantageously, the main face of the semi-finished barrel spring 4' opposite the exposed main face, here the lower main face 14b, is positioned in contact with the support 20, parallel to the latter. Advantageously, the face of the ring 16 and the main face of the spring 4' (here the lower face 14b) are glued to the support 20 opposite the face of the ring 16 and the main face of the barrel spring 4' which are exposed.

Then, according to step c), the main face of the semi-finished barrel spring 4' exposed according to step b), here the upper main face 14a, is polished, in particular in order to eliminate the sharp edges and obtain rounding.

[0040] Advantageously, step c) is carried out by means of at least one polishing disk 22 positioned above the main face of the semi-finished barrel spring 4' exposed according to step b ), here the upper main face 14a. Different discs with different grains can be used. The grains are advantageously the standard watchmaking grains.

Preferably, the polishing disk 22 is a felt disk. Standard watchmaking pens are advantageously used.

Preferably, the polishing disk 22 is arranged to polish the upper edge 12a of all the turns at the same time. It is also possible to provide polishing means which move relative to the main exposed face in order to polish the edges of the turns in zones.

[0043] Step c) of polishing the exposed main face of the semi-finished barrel spring 4', here the upper main face 14a, is carried out so that the upper edges 12a of the turns of the finished barrel spring 4 have a roughness Ra less than or equal to 0.2 µm, and preferably less than or equal to 0.1 µm, preferably less than or equal to 50 nm, preferably less than or equal to 25 nm, preferably less than or equal to 10 nm, preferably less or equal to 5 nm, and preferably less than or equal to 2 nm. The roughness Ra is defined according to the ISO 4287 standard.

Then, according to step d), the barrel ring-spring assembly 18 obtained in step c) is separated from the support 20.

[0045] Advantageously, when the barrel ring-spring assembly 18 has been temporarily fixed on the support 20 according to step b) by means of an adhesive, in particular a temporary adhesive, the separation of the The barrel ring-spring assembly 18 of the support 20 is produced by dissolving said glue. For example, suitable chemicals (such as solvents) can be used to dissolve the glue. These products can be sprayed or used preferably in the form of baths.

Then, in a step d'), the barrel ring-spring assembly 18 obtained in step d) is turned over so that the exposed main face of the barrel spring is now the lower main face 14b. Then we implement steps e) to g) which reproduce steps b) to d) but with the other main face of the semi-finished barrel spring 4' which is now exposed, here the lower main face 14b.

More particularly, according to step e), at least one barrel ring-spring assembly 18 obtained in step d) and returned according to step d') is temporarily fixed on the support 20 so as to to expose the other main face of the semi-finished barrel spring 4', here the lower main face 14b, for the implementation of the following step f).

[0048] In a manner similar to step b), the barrel ring-spring assembly 18 is fixed according to step e) provisionally on the support 20, preferably by gluing, for example by means of a dissolvable resin. Advantageously, the main face of the semi-finished barrel spring 4' opposite the exposed main face, here the lower main face 14a, is positioned in contact with the support 20, parallel to the latter. Advantageously, the face of the ring 16 and the main face of the spring 4' already polished according to step c) are glued to the support 20 (here the upper face 14a) opposite the face of the ring 16 and the main face of the barrel spring 4 'which are exposed.

Then, according to step f), the main face of the semi-finished barrel spring 4' exposed according to step e), here the upper main face 14b, is polished.

[0050] In a manner similar to step c), step f) is carried out by means of at least one polishing disk 22, preferably made of felt, positioned above the main face of the spring. semi-finished barrel 4' exposed according to step e), here the lower main face 14b.

[0051] In a manner similar to step c), step f) of polishing the exposed main face of the semi-finished barrel spring 4', here the lower main face 14b, is carried out so that the lower edges 12b of the turns of the finished barrel spring 4 have a roughness Ra less than or equal to 0.2 µm, and preferably less than or equal to 0.1 µm, preferably less than or equal to 50 nm, preferably less than or equal to 25 nm, preferably less than or equal to 10 nm, preferably less than or equal to 5 nm, and preferably less than or equal to 2 nm.

Then, according to step g), the barrel ring-spring assembly 18 obtained in step f) is separated from the support 20.

[0053] In a manner similar to step d), when the barrel ring-spring assembly 18 has been temporarily fixed on the support 20 according to step e) by means of an adhesive, in particular an adhesive temporarily, the separation of the barrel ring-spring assembly 18 from the support 20 according to step g) is carried out by dissolving said glue using the appropriate chemicals.

[0054] A finished barrel ring-spring assembly 18 is thus obtained in which the finished barrel spring 4 is such that the upper edges 12a and lower 12b of the turns have a roughness Ra less than or equal to 0.2 µm, and preferably less or equal to 0.1 µm, preferably less than or equal to 50 nm, preferably less than or equal to 25 nm, preferably less than or equal to 10 nm, preferably less than or equal to 5 nm, and preferably less than or equal to 2 nm .

[0055] With the exception of the upper edges 12a and lower 12b of the turns which have been polished, the finished barrel spring 4 is similar to the semi-finished barrel spring 4'.

[0056] In a preferred embodiment, the method of the invention is implemented to polish several barrel ring-spring assemblies 18 at the same time, during at least one of steps c) and f).

[0057] For this purpose, in step a), several semi-finished barrel ring-spring assemblies 18 are provided as described above. Then, at least in one of steps b) and e), and preferably, for each of steps b) and e), said several semi-finished barrel ring-spring assemblies 18 are fixed on the same support 20 in order to to expose one of the main faces 14a, 14b of the semi-finished barrel springs 4', then at least in one of steps c) and f), and preferably for each of steps c) and f), the exposed main faces 14a and/or 14b of the semi-finished barrel springs 4' of all the barrel ring-spring assemblies 18 fixed on the support 20 are polished during the same operation. Then the barrel ring-spring assemblies 18 are separated from the support 20 according to at least one of steps d) and g), and preferably for each of steps d) and g). Between steps d) and e), the ring-barrel spring assemblies 18 are turned over to expose the other main face of the semi-finished barrel springs 4'.

[0058] Several barrel ring-spring assemblies 18 can be provided positioned on the same support 20, but also several supports 20 comprising several barrel ring-spring assemblies 18. The configuration of the polishing machine is adapted accordingly. For example, each support 20 can be arranged on a turnstile above which one or more polishing means are positioned, such as polishing discs 22. The polishing means can be arranged to polish the upper edge 12a or the lower edge 12b of all the turns of all or part of the barrel ring-spring assemblies 18 at the same time, the barrel ring-spring assemblies 18 being on the same support 20 or on different supports 20. It is also possible to provide polishing means which move relative to the main faces of the exposed barrel springs in order to polish the edges of the turns of the ring-barrel spring assemblies 18 distributed by zones on the same support.

[0059] Optionally, but preferably, the barrel spring 4 is lubricated in order to be completely finished, ready for use.

To this end, according to step h) of the method of the invention, the barrel spring 4 obtained in step g) is removed by the watchmaker from its conditioning ring 16.

Then, according to step i), the barrel spring 4 obtained in step h) is lubricated by any lubricating agent known to those skilled in the art.

[0062] Then, according to step j), the barrel spring 4 lubricated according to step i) is replaced by the watchmaker in its conditioning ring 16 to recondition it into a finished barrel ring-spring assembly 18.

The finished barrel ring-spring assembly 18 obtained after step g), and preferably after step j), is ready for use and can be used in a similar manner to the ring-spring assemblies of barrel known for the manufacture of a watch barrel 1.

[0064] More particularly, the method of manufacturing such a watch barrel comprises the manufacture of a barrel spring according to the method described above, said method of manufacturing the watch barrel 1 comprising the following steps: k) position the finished barrel ring-spring assembly 18 obtained in step g) or j) on the barrel drum 2; l) insert the finished barrel spring 4 into the barrel drum 2 by removing it from its conditioning ring 16; m) release the conditioning ring 16 from the barrel drum 2; n) complete the assembly of the barrel 1, in particular by mounting the barrel shaft 6 and installing the barrel cover 8 to close the barrel 1.

[0065] We thus obtain a barrel 1 in which the barrel spring 4 is such that the edges of the turns wound to form said spring have a roughness Ra less than or equal to 0.2 µm, and preferably less than or equal to 0.1 µm, of preferably less than or equal to 50 nm, preferably less than or equal to 25 nm, preferably less than or equal to 10 nm, preferably less than or equal to 5 nm, and preferably less than or equal to 2 nm.

[0066] The method of manufacturing at least one barrel spring according to the invention is simple to implement, and makes it possible to obtain a barrel spring whose edges are capable of being in contact with the barrel drum or the barrel cover have a very low roughness Ra. This very low roughness Ra makes it possible to obtain barrel springs which notably present a reduction in the risk of cracking, an improvement in fatigue resistance, a reduction in the friction forces between the edges of the turns and the drum and/or the barrel cover, and a potential increase in power reserve, improved compared to barrel springs manufactured by a standard process.

Claims (10)

1. Method for manufacturing at least one barrel spring (4) comprising the following steps: a) provide yourself with at least one semi-finished barrel ring-spring assembly (18) in which a semi-finished barrel spring (4') is wound in turns in the center of a conditioning ring (16) of so as to present two accessible parallel main faces (14a, 14b), formed respectively by the edges (12a, 12b) of the wound turns; b) temporarily fix the barrel ring-spring assembly (18) provided in step a) on a support (20) so as to expose one of the main faces (14a, 14b) of the barrel spring ( 4') semi-finished; c) polish the main face (14a, 14b) of the semi-finished barrel spring (4') exposed according to step b); d) separate the barrel ring-spring assembly (18) obtained in step c) from the support (20); e) temporarily fix the barrel ring-spring assembly (18) obtained in step d) on the support (20) so as to expose the other main face (14a, 14b) of the barrel spring (4 ') Half finished ; f) polishing the main face (14a, 14b) of the semi-finished barrel spring (4') exposed according to step e); g) separate the barrel ring-spring assembly (18) obtained in step f) from the support (20); h) remove the barrel spring (4) obtained in step g) from its conditioning ring (16); i) lubricate the barrel spring (4) obtained in step h); j) replace the barrel spring (4) lubricated according to step i) in its conditioning ring (16) to recondition it into a finished barrel ring-spring assembly (18), steps h) to j) being optional . 2. Method of manufacturing at least one barrel spring (4) according to claim 1, in which the barrel ring-spring assembly (18) is temporarily fixed on the support (20) according to at least the one of steps b) and e) by gluing. 3. Method for manufacturing at least one barrel spring (4) according to one of claims 1 and 2, in which at least one of steps c) and f) of polishing the main faces (14a, 14b) of the semi-finished barrel spring (4') is produced by means of at least one polishing disk (22). 4. Method of manufacturing at least one barrel spring (4) according to claim 3, wherein the polishing disk (22) is a felt disk. 5. Method for manufacturing at least one barrel spring (4) according to one of claims 1 to 4, in which at least one of steps c) and f) of polishing the main faces (14a, 14b) of the semi-finished barrel spring (4') is produced so that the edges (12a, 12b) of the turns of the finished barrel spring (4) have a roughness Ra less than or equal to 0.2 µm, and preferably less than or equal at 0.1 µm, preferably less than or equal to 50 nm, preferably less than or equal to 25 nm, preferably less than or equal to 10 nm, preferably less than or equal to 5 nm, and preferably less than or equal to 2 nm. 6. Method of manufacturing at least one barrel spring (4) according to one of claims 1 to 5, in which the ring-barrel spring assembly (18) is temporarily fixed on the support (20) according to minus one of steps b) and e) by means of an adhesive, the respective step d) and g) of separating the barrel ring-spring assembly (18) from the support (20) being carried out by dissolution of said glue. 7. Method for manufacturing at least one barrel spring (4) according to one of claims 1 to 6, wherein, in step a), several barrel ring-spring assemblies (18) are provided. semi-finished, at least in one of steps b) and e), said several barrel ring-spring assemblies (18) are fixed on the same support (20), at least in one of steps c) and f), the exposed major faces (14a, 14b) of the semi-finished barrel springs (4') of all barrel ring-spring assemblies (18) attached to the support (20) are polished before separating the ring assemblies -barrel spring (18) of the support (20) according to at least one of steps d) and g). 8. Method for manufacturing a watch barrel (1) comprising the manufacture of a barrel spring (4) according to a method defined by one of claims 1 to 7, comprising the following steps: k) position the finished barrel ring-spring assembly (18) obtained in step g) or j) on the barrel drum (2); l) insert the finished barrel spring (4) into the barrel drum (2) by removing it from its conditioning ring (16); m) release the conditioning ring (16) from the barrel drum (2); n) complete the assembly of the watch barrel (1). 9. Barrel spring (4) obtained according to a method defined by one of claims 1 to 7, characterized in that the edges (12a, 12b) of the wound turns have a roughness Ra less than or equal to 0.2 µm, and preferably less than or equal to 0.1 µm, preferably less than or equal to 50 nm, preferably less than or equal to 25 nm, preferably less than or equal to 10 nm, preferably less than or equal to 5 nm, and preferably less than or equal to 2nm. 10. Watch barrel (1) comprising a finished barrel spring (4) according to claim 9.