EP3067755A1 - Barillet pour une piece d'horlogerie - Google Patents
Barillet pour une piece d'horlogerie Download PDFInfo
- Publication number
- EP3067755A1 EP3067755A1 EP16159999.8A EP16159999A EP3067755A1 EP 3067755 A1 EP3067755 A1 EP 3067755A1 EP 16159999 A EP16159999 A EP 16159999A EP 3067755 A1 EP3067755 A1 EP 3067755A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- barrel
- main spring
- titanium
- timepiece
- mating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000010936 titanium Substances 0.000 claims abstract description 40
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 40
- 230000013011 mating Effects 0.000 claims abstract description 34
- 239000000463 material Substances 0.000 claims abstract description 17
- 238000007745 plasma electrolytic oxidation reaction Methods 0.000 claims abstract description 14
- 229910052751 metal Inorganic materials 0.000 claims description 14
- 239000002184 metal Substances 0.000 claims description 12
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 229910052755 nonmetal Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 229910045601 alloy Inorganic materials 0.000 claims description 5
- 239000000956 alloy Substances 0.000 claims description 5
- 239000010703 silicon Substances 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 229920002430 Fibre-reinforced plastic Polymers 0.000 claims 1
- 239000011151 fibre-reinforced plastic Substances 0.000 claims 1
- 229910001369 Brass Inorganic materials 0.000 abstract description 10
- 239000010951 brass Substances 0.000 abstract description 10
- 238000000034 method Methods 0.000 abstract description 8
- 230000008569 process Effects 0.000 abstract description 8
- 238000002048 anodisation reaction Methods 0.000 abstract description 2
- 238000005260 corrosion Methods 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 6
- 238000007743 anodising Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 5
- 229910000883 Ti6Al4V Inorganic materials 0.000 description 3
- 239000003086 colorant Substances 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000011152 fibreglass Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 230000003252 repetitive effect Effects 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000007943 implant Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 150000002843 nonmetals Chemical class 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G04—HOROLOGY
- G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
- G04B1/00—Driving mechanisms
- G04B1/10—Driving mechanisms with mainspring
- G04B1/16—Barrels; Arbors; Barrel axles
Definitions
- the present invention relates to a timepiece and is particularly directed to a mechanical timepiece wherein the barrel is made of titanium and/or titanium alloy in order to produce a lighter weight barrel.
- the mating wall surface of the barrel is of oxidized titanium surface.
- the oxidation process is achieved through plasma electrolytic oxidation or microarc oxidation.
- the oxidised titanium surface of the barrel provides less frictions between the mating wall surface of the barrel and the main spring, thereby increasing the accuracy rate and reducing energy loss.
- the drive power is provided by a main spring by being transmitted to the barrel.
- the main spring is fitted in the barrel and freely engages the inner surface of the barrel wall. It is possible to rivet the outer end of the main spring to a friction spring.
- This friction spring together with the wall of the barrel forms a slip coupling which prevents over-winding of the main spring by allowing the outer end of the main spring to slip when it is being wound.
- timepiece barrels are typically made of brass while the main spring is made of steel.
- steel is harder than brass, it was generally accepted that this combination of mating materials favourable reduces wear and energy loss.
- gold or a layer of high quality synthetic material has been used to plate between the outermost turn of the spring and the inner wall of the brass surface of the barrel.
- timepiece barrel that has a lighter weight, has a higher strength, is corrosion-protective, is efficient in transferring energy by minimising frictions, low cost and is abundant and can be found easily.
- Titanium is abundant on the sub-surface of the earth and can easily be found. Titanium could be mixed with other metal elements, forming titanium alloy. Such alloys have very high tensile strength and toughness (even at extreme temperatures). There are light in weight, have extraordinary corrosion resistance and the ability to withstand extreme temperatures.
- the barrel is furthermore treated with plasma electrolytic oxidation or microarc oxidation to achieve a satisfying oxidized titanium on the mating surface of the timepiece barrel.
- Barrel made of titanium not only gives a light weight and thereby reduces the overall weight of the timepiece, the oxidation process through plasma electrolytic oxidation or microarc oxidation renders less energy loss as fewer frictions occur between the mating surface of the surface wall of the barrel and the mating surface of the main spring, and hence increases its accuracy rate.
- another advantage of using titanium in producing barrel is of its high strength-to-weight ratio compared to other typically used materials such as brass.
- the present invention relates to a timepiece having a barrel, wherein a main spring is located within the barrel, wherein the hardness of the material of the main spring is substantially equal or higher than the hardness of the material of the mating wall surface of the barrel, wherein the material of the mating wall surface of the barrel comprises titanium.
- the titanium barrel has a lighter weight compared to other conventional timepiece barrel, for instance barrel made of brass.
- the titanium barrel also has the hardness equal or less than the main spring, thereby "give" to avoid energy loss due to frictions between the mating surface of the timepiece barrel and the main spring.
- the material of the mating wall surface of the barrel is titanium alloy Grade 5.
- Titanium alloy Grade 5 also known as Ti6Al4V, Ti-6Al-4V or Ti 6-4.
- the chemical composition of the titanium alloy Grade 5 comprises of 6 % aluminium, 4 % vanadium, 0.25 % (maximum) iron, 0.2 % (maximum) oxygen, and the remainder being titanium. It is significantly stronger than commercially pure titanium while having the same stiffness and thermal properties (excluding thermal conductivity). Titanium alloy Grade 5 is especially known for its heat treatable properties. For these reasons, this grade is an excellent combination of strength, corrosion resistance, weld and fabricability and thereby is chosen as an alternative material for timepiece barrel according to the present invention.
- the mating wall surface of the barrel is of oxidised titanium surface.
- the oxidised titanium barrel generally gives a dark grey corrosion-protective layer to prevent the corrosion of the barrel.
- the oxidized titanium surface of the barrel according to the present invention has improved wear and corrosion resistance as well as anti-galling properties.
- the oxidised titanium barrel renders less energy loss resulting from frictions between the mating surface of the titanium barrel and mating surface of the main spring.
- the oxidized titanium surface of the mating wall surface of the barrel may be of AMS 2488C standard, which is anodic treated.
- Anodization process accelerates the formation of an oxide coating under controlled conditions to provide the desired result.
- Titanium anodizing provides the advantages of hardening and colouring the surface of titanium components without altering the surface properties of the metal. By precisely specifying the surface oxide level, an entire range of colours can be produced. The resulting anodize colours are achieved without any dyes or coatings, therefore the surface properties remain unchanged, making the part suitable for different applications including in timepiece.
- titanium anodizing process combined with passivation produces implant grade cleanliness, while the resulting colours provide for product identification. The process also improves the fatigue strength of the titanium, with minimal dimensional change.
- titanium anodizing is primarily used in the medical industry, there is an increasing interest in the consumer, especially in the luxury markets such as timepiece. Titanium colour anodizing has many advantages including large colour spectrum, produces a clean and passive surface.
- titanium type II anodizing has the advantages such as anti-galling, lubrication, increased resistance to galvanic corrosion and has a passive surface.
- the mating wall surface of the barrel is treated with plasma electrolytic oxidation or microarc oxidation thus giving the oxidised titanium barrel which has the corrosion-protective effect as well as efficient in transferring energy from main spring to the barrel by avoiding unnecessary energy loss by reducing friction rate.
- the main spring is made of metal or non-metal.
- Non-metal main spring may comprise of silicon or fibre enhanced plastic such as fibreglass. These non-metal materials are suitable to make main spring.
- non-metal main spring has advantages over metal main spring for instance the increased torque and also its efficient in storing energy. Furthermore, main spring made of silicon or fibre glass loses less than 1 % energy compared to metal main spring which could lose more than 10 % energy in a period of 24 hours.
- metal main spring such as steel or any metal that has a relatively high hardness are widely used to make main spring due to its economic value as well as its easy and simple construction.
- the metal main spring is made of alloy, preferably on Ni-Co-Cr basis.
- the alloy main spring has a higher strength compared to steel main spring and it is resistant to corrosion.
- present invention searches for alternative composition to produce a barrel that is lighter and in the meantime which is more efficient is transferring energy while minimizing frictions which is the major reason contributing for energy loss.
- barrel which is made of titanium renders the weight of the barrel significantly less than the barrel that is made of brass by approximately 10 % or up to 40 %.
- titanium barrel surface that is treated with oxidation process such as plasma electrolytic oxidation or microarc oxidation renders less friction between the mating surface of the barrel and the mating surface of the main spring, while the oxidized titanium surface of the barrel acts as a superior corrosion-protective layer.
- oxidation process such as plasma electrolytic oxidation or microarc oxidation
- the mating wall surface of the barrel is made of titanium and/or titanium alloy according to the present invention whereas the non-mating wall surface of the barrel (for instance the outer and bottom wall surface of the barrel) maybe made of other conventional metal elements, for instance of brass.
- the mating wall surface of the barrel which is in exposed to the movements of the main spring plays a critical role in reducing the frictional rates thereby losing the transmitted energy from the main spring to the barrel.
- Barrel having a combination of brass or any other metals and titanium according to the present invention provides a superior combination, whereby on one hand, less friction on the mating wall surface occurs thus less energy is lost, on another hand, an ideal weight of the timepiece can be regulated through the barrel while the cost of the barrel can be kept at an optimal level. For this reason, different timepiece weights accustomed to different purposes or users (male, female or children timepiece) can be produced accordingly.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Springs (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH3392015 | 2015-03-12 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3067755A1 true EP3067755A1 (fr) | 2016-09-14 |
EP3067755B1 EP3067755B1 (fr) | 2017-09-13 |
Family
ID=54148282
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16159999.8A Active EP3067755B1 (fr) | 2015-03-12 | 2016-03-11 | Barillet pour une piece d'horlogerie |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP3067755B1 (fr) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH539128A (fr) * | 1971-04-05 | 1973-07-15 | Metaux Precieux Sa | Procédé de fabrication d'une pièce métallique présentant une surface dure, et pièce métallique obtenue selon le procédé |
WO2005045532A2 (fr) * | 2003-11-07 | 2005-05-19 | Seiko Epson Corporation | Compteur de temps et ressort correspondant |
EP2548982A1 (fr) * | 2011-07-08 | 2013-01-23 | Titanium Engineering Sàrl | Alliage de titane affiné |
-
2016
- 2016-03-11 EP EP16159999.8A patent/EP3067755B1/fr active Active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH539128A (fr) * | 1971-04-05 | 1973-07-15 | Metaux Precieux Sa | Procédé de fabrication d'une pièce métallique présentant une surface dure, et pièce métallique obtenue selon le procédé |
WO2005045532A2 (fr) * | 2003-11-07 | 2005-05-19 | Seiko Epson Corporation | Compteur de temps et ressort correspondant |
EP2548982A1 (fr) * | 2011-07-08 | 2013-01-23 | Titanium Engineering Sàrl | Alliage de titane affiné |
Non-Patent Citations (1)
Title |
---|
KEUN-TAEK OH ET AL: "Cytocompatibility and electrochemical properties of Ti-Au alloys for biomedical applications", JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART B: APPLIED BIOMATERIALS, vol. 83B, no. 2, 1 November 2007 (2007-11-01), pages 320 - 326, XP055047686, ISSN: 1552-4973, DOI: 10.1002/jbm.b.30798 * |
Also Published As
Publication number | Publication date |
---|---|
EP3067755B1 (fr) | 2017-09-13 |
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