EP3502288B1 - Herstellungsverfahren einer spiralfeder für uhrwerk - Google Patents
Herstellungsverfahren einer spiralfeder für uhrwerk Download PDFInfo
- Publication number
- EP3502288B1 EP3502288B1 EP17209686.9A EP17209686A EP3502288B1 EP 3502288 B1 EP3502288 B1 EP 3502288B1 EP 17209686 A EP17209686 A EP 17209686A EP 3502288 B1 EP3502288 B1 EP 3502288B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- alloy
- niobium
- titanium
- deformation
- manufacturing
- 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.)
- Active
Links
- 238000000034 method Methods 0.000 title claims description 31
- 238000004519 manufacturing process Methods 0.000 title claims description 29
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 66
- 229910045601 alloy Inorganic materials 0.000 claims description 57
- 239000000956 alloy Substances 0.000 claims description 57
- 239000010936 titanium Substances 0.000 claims description 53
- 229910052719 titanium Inorganic materials 0.000 claims description 47
- 238000010438 heat treatment Methods 0.000 claims description 45
- 239000010955 niobium Substances 0.000 claims description 43
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 41
- 239000000463 material Substances 0.000 claims description 35
- 229910052758 niobium Inorganic materials 0.000 claims description 35
- 239000010949 copper Substances 0.000 claims description 29
- 229910052802 copper Inorganic materials 0.000 claims description 25
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 21
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 19
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 19
- 239000002344 surface layer Substances 0.000 claims description 16
- 229910001257 Nb alloy Inorganic materials 0.000 claims description 15
- 229910052759 nickel Inorganic materials 0.000 claims description 14
- 239000006104 solid solution Substances 0.000 claims description 14
- 238000005096 rolling process Methods 0.000 claims description 12
- 239000010410 layer Substances 0.000 claims description 10
- 229910052760 oxygen Inorganic materials 0.000 claims description 10
- 238000010791 quenching Methods 0.000 claims description 10
- 229910052710 silicon Inorganic materials 0.000 claims description 9
- 229910052782 aluminium Inorganic materials 0.000 claims description 8
- 229910052799 carbon Inorganic materials 0.000 claims description 8
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 8
- 229910052737 gold Inorganic materials 0.000 claims description 8
- 239000010931 gold Substances 0.000 claims description 8
- 229910052739 hydrogen Inorganic materials 0.000 claims description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims description 8
- 230000000171 quenching effect Effects 0.000 claims description 8
- 239000000243 solution Substances 0.000 claims description 8
- 238000000151 deposition Methods 0.000 claims description 7
- 238000007493 shaping process Methods 0.000 claims description 7
- 238000011282 treatment Methods 0.000 claims description 7
- 229910000570 Cupronickel Inorganic materials 0.000 claims description 6
- 238000005491 wire drawing Methods 0.000 claims description 6
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 5
- QDWJUBJKEHXSMT-UHFFFAOYSA-N boranylidynenickel Chemical compound [Ni]#B QDWJUBJKEHXSMT-UHFFFAOYSA-N 0.000 claims description 5
- OFNHPGDEEMZPFG-UHFFFAOYSA-N phosphanylidynenickel Chemical compound [P].[Ni] OFNHPGDEEMZPFG-UHFFFAOYSA-N 0.000 claims description 5
- 230000000717 retained effect Effects 0.000 claims description 5
- 229910052709 silver Inorganic materials 0.000 claims description 5
- 239000004332 silver Substances 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 3
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims 2
- AIRCTMFFNKZQPN-UHFFFAOYSA-N AlO Inorganic materials [Al]=O AIRCTMFFNKZQPN-UHFFFAOYSA-N 0.000 claims 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims 1
- 229910052681 coesite Inorganic materials 0.000 claims 1
- 229910052593 corundum Inorganic materials 0.000 claims 1
- 229910052906 cristobalite Inorganic materials 0.000 claims 1
- 230000001186 cumulative effect Effects 0.000 claims 1
- 239000000377 silicon dioxide Substances 0.000 claims 1
- 235000012239 silicon dioxide Nutrition 0.000 claims 1
- 229910052682 stishovite Inorganic materials 0.000 claims 1
- 229910052905 tridymite Inorganic materials 0.000 claims 1
- 229910001845 yogo sapphire Inorganic materials 0.000 claims 1
- 239000000203 mixture Substances 0.000 description 5
- 229910018104 Ni-P Inorganic materials 0.000 description 4
- 229910001275 Niobium-titanium Inorganic materials 0.000 description 4
- 229910018536 Ni—P Inorganic materials 0.000 description 4
- RJSRQTFBFAJJIL-UHFFFAOYSA-N niobium titanium Chemical compound [Ti].[Nb] RJSRQTFBFAJJIL-UHFFFAOYSA-N 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052715 tantalum Inorganic materials 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910001040 Beta-titanium Inorganic materials 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910020012 Nb—Ti Inorganic materials 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 2
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical group [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 2
- 229910052726 zirconium Inorganic materials 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000942 Elinvar Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- RZJQYRCNDBMIAG-UHFFFAOYSA-N [Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Zn].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn] Chemical class [Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Cu].[Zn].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Ag].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn].[Sn] RZJQYRCNDBMIAG-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 229910052735 hafnium Inorganic materials 0.000 description 1
- VBJZVLUMGGDVMO-UHFFFAOYSA-N hafnium atom Chemical compound [Hf] VBJZVLUMGGDVMO-UHFFFAOYSA-N 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 230000005291 magnetic effect Effects 0.000 description 1
- 238000002595 magnetic resonance imaging Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- 230000005298 paramagnetic effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002887 superconductor Substances 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21F—WORKING OR PROCESSING OF METAL WIRE
- B21F35/00—Making springs from wire
- B21F35/04—Making flat springs, e.g. sinus springs
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
- C21D8/1266—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest between cold rolling steps
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1277—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular surface treatment
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/02—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for springs
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C27/00—Alloys based on rhenium or a refractory metal not mentioned in groups C22C14/00 or C22C16/00
- C22C27/02—Alloys based on vanadium, niobium, or tantalum
-
- 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
- G04B17/00—Mechanisms for stabilising frequency
- G04B17/04—Oscillators acting by spring tension
- G04B17/06—Oscillators with hairsprings, e.g. balance
-
- 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
- G04B17/00—Mechanisms for stabilising frequency
- G04B17/04—Oscillators acting by spring tension
- G04B17/06—Oscillators with hairsprings, e.g. balance
- G04B17/063—Balance construction
-
- 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
- G04B17/00—Mechanisms for stabilising frequency
- G04B17/04—Oscillators acting by spring tension
- G04B17/06—Oscillators with hairsprings, e.g. balance
- G04B17/066—Manufacture of the spiral spring
-
- 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
- G04B17/00—Mechanisms for stabilising frequency
- G04B17/20—Compensation of mechanisms for stabilising frequency
- G04B17/22—Compensation of mechanisms for stabilising frequency for the effect of variations of temperature
- G04B17/227—Compensation of mechanisms for stabilising frequency for the effect of variations of temperature composition and manufacture of the material used
-
- 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
- G04B43/00—Protecting clockworks by shields or other means against external influences, e.g. magnetic fields
- G04B43/007—Antimagnetic alloys
Definitions
- the invention relates to a method of manufacturing a spiral spring intended to equip a balance of a clockwork movement.
- spiral springs are also centered on the concern for thermal compensation, so as to guarantee regular chronometric performance. This requires obtaining a thermoelastic coefficient close to zero. We are also looking to produce spiral springs with limited sensitivity to magnetic fields.
- New balance springs have been developed from alloys of niobium and titanium.
- these alloys pose problems of sticking and seizing in the drawing or drawing dies (diamond or hard metal) and against the rolling rolls (hard metal or steel), which makes them almost impossible to transform into wires. purposes by standard processes used eg for steel.
- An object of the present invention is to provide a method of manufacturing a spiral spring intended to equip a balance with a clockwork movement making it possible to facilitate deformation, and more particularly to obtain easy rolling.
- the method comprises, before the deformation step, a step of depositing, on the alloy blank, a surface layer of a ductile material chosen from the group comprising copper, nickel, cupro-nickel, cupro-manganese, gold, silver, nickel-phosphorus Ni-P and nickel-boron Ni-B, to facilitate the shaping in the form of wire, the thickness of the layer of ductile material deposited being chosen so that the ratio of ductile material area / area of the NbTi alloy for a given wire section is less than 1, preferably less to 0.5, and more preferably between 0.01 and 0.4.
- Such a manufacturing process makes it possible to facilitate the shaping in wire form of the NbTi alloy blank, and more specifically to facilitate the drawing, drawing and rolling.
- the document WO 2005/045532 in the name of Seiko describes a clockwork spring for ensuring high precision and stable operation of precision mechanisms such as clocks, which may be a clockwork spring, a mainspring, or a hairspring.
- This spring is formed of a special titanium alloy and has an S-shape when it is freely deployed, in which the inflection point at which the direction of curvature of the freely deployed form changes is formed more inside than the middle of an inner end to the winding side end and an outer end to the opposite end to the inner end.
- the titanium alloy has a high tensile stress and a low average Young's modulus, making it possible to increase the mechanical energy stored in the mainspring.
- This alloy may be a titanium alloy with an element from the vanadium group, with in particular a proportion by weight of element from the vanadium group of 20 to 80%, and more particularly of 30 to 60%.
- the proportion by mass of constituents other than titanium can exceed 50%.
- no more precise composition of the alloy is disclosed for the spring described.
- the document WO2015 / 189278 in the name of Cartier describes a spiral spring in a titanium alloy containing: a titanium base, from 10 to 40 atomic% of at least one element among Nb, Ta or V, from 0 to 3 atomic% of oxygen, of 0 to 6 atomic% zirconium; and from 0 to 5 atomic% hafnium.
- This hairspring is less sensitive to temperature, and has a lower density than a conventional hairspring.
- the document WO2018 / 172164 in the name of united de Lorraine describes a metastable ⁇ titanium alloy comprising, in percentage by mass, between 24 and 45% niobium, between 0 and 20% of zirconium, between 0 and 10% of tantalum and / or between 0 and 1.5% silicon and / or less than 2% oxygen.
- This alloy has a crystallographic structure which comprises a mixture of austenitic phase and alpha phase, and the presence of omega phase precipitates, the volume fraction of which is less than 10%.
- This document also describes a clockwork spring made on the basis of such an alloy, and a method of manufacturing such a spring.
- the document EP2993531 in the name of Précision Engineering AG describes a method of shaping a mechanical spring, in particular a spiral spring, comprising the steps of preparing a spring, in particular a spiral spring, comprising at least one curved section intended for reshaping with at least one deformable section, then performing a local heating step of at least the deformable section to a first temperature, which is within a semi-hot formation temperature range of the material of the deformable section , then in imparting a movement of the deformable section to obtain a predetermined shape of curve in the deformable section, this movement being carried out, either after or during the heating step and in a semi-hot state, or well before the heating step.
- a press bulletin H. Moser & Cie and Précision Engineering of 22.11.2016 describes a hairspring for a watch regulating member made of niobium-titanium alloy, the composition of which is not disclosed.
- the document EP 1 083 243 describes a beta titanium alloy wire and a process for its manufacture.
- the document JP 04279212 discloses a process for manufacturing fine wire of titanium alloys comprising the steps of coating titanium wire with copper and repeated drawing and annealing.
- the invention relates to a method of manufacturing a spiral spring intended to equip a balance of a clockwork movement and made of a binary type alloy comprising niobium and titanium.
- the titanium content in ⁇ form in the alloy of the blank is preferably less than or equal to 2.5% by volume, or even close to or equal to 0.
- the alloy used in the present invention comprises between 40 and 49% by weight of titanium, preferably between 44 and 49% by weight of titanium, and more preferably between 46% and 48% by weight of titanium , and preferably said alloy comprises more than 46.5% by weight of titanium and said alloy comprises less than 47.5% by weight of titanium.
- the titanium content is greater than or equal to 46.5% by weight relative to the total of the composition.
- the titanium content is less than or equal to 47.5% by weight relative to the total of the composition.
- the NbTi alloy used in the present invention does not comprise other elements except for possible and inevitable traces. This prevents the formation of fragile phases.
- the oxygen content is less than or equal to 0.10% by weight of the total, or even less than or equal to 0.085% by weight of the total.
- the tantalum content is less than or equal to 0.10% by weight of the total.
- the carbon content is less than or equal to 0.04% by weight of the total, in particular less than or equal to 0.020% by weight of the total, or even less than or equal to 0.0175% by weight of the total.
- the iron content is less than or equal to 0.03% by weight of the total, in particular less than or equal to 0.025% by weight of the total, or even less than or equal to 0.020% by weight of the total.
- the nitrogen content is less than or equal to 0.02% by weight of the total, in particular less than or equal to 0.015% by weight of the total, or even less than or equal to 0.0075% by weight of the total.
- the hydrogen content is less than or equal to 0.01% by weight of the total, in particular less than or equal to 0.0035% by weight of the total, or even less than or equal to 0.0005% by weight of the total.
- the silicon content is less than or equal to 0.01% by weight of the total.
- the nickel content is less than or equal to 0.01% by weight of the total, in particular less than or equal to 0.16% by weight of the total.
- the content of ductile material, such as copper, in the alloy is less than or equal to 0.01% by weight of the total, in particular less than or equal to 0.005% by weight of the total.
- the aluminum content is less than or equal to 0.01% by weight of the total.
- the spiral spring produced according to the invention has an elastic limit greater than or equal to 600 MPa.
- this spiral spring has a modulus of elasticity less than or equal to 100 GPa, and preferably between 60 GPa and 80 GPa.
- the spiral spring produced according to the invention has a thermoelastic coefficient, also called CTE, allowing it to guarantee the maintenance of chronometric performance despite the variation in the temperatures of use of a watch incorporating such a spiral spring.
- the CTE of the alloy must be close to zero ( ⁇ 10 ppm / ° C) to obtain a thermal coefficient of the oscillator equal to ⁇ 0.6 s / d / ° C.
- E is the Young's modulus of the hairspring, and, in this formula, E, ⁇ and ⁇ are expressed in ° C -1 .
- CT is the thermal coefficient of the oscillator
- (1 / E. DE / dT) is the CTE of the balance spring alloy
- ⁇ is the expansion coefficient of the balance and ⁇ that of the balance spring.
- Such a thickness of ductile material, and in particular copper, makes it possible to easily stretch, draw and roll the Cu / NbTi composite material.
- the ductile material preferably copper, is thus deposited at a given time to facilitate the shaping of the wire by drawing and drawing, so that a thickness thereof remains preferably between 1 and 500 micrometers on the wire has a total diameter of 0.2 to 1 millimeter.
- the supply of ductile material in particular copper, can be galvanic, PVD or CVD, or else mechanical, it is then a jacket or a tube of ductile material such as copper which is fitted to a bar of niobium alloy. titanium to a large diameter, then which is thinned during the step (s) of deformation of the composite bar.
- the method of the invention can comprise, after the deformation step, a step of eliminating said surface layer of ductile material.
- the ductile material is removed once all the deformation treatment operations have been carried out, that is to say after the last rolling, before the stretching.
- the wire is freed from its layer of ductile material, such as copper, in particular by chemical attack, with a solution based on cyanides or based on acids, for example nitric acid.
- the surface layer of ductile material is retained on the spiral spring, the thermoelastic coefficient of the niobium and titanium alloy being adapted accordingly so as to compensate for the effect of the ductile material.
- the thermoelastic coefficient of the niobium titanium alloy can be easily adjusted by choosing the appropriate strain rate and heat treatments.
- the surface layer of ductile material retained makes it possible to obtain a perfectly regular final wire section.
- the ductile material can here be copper or gold, deposited by galvanic route, PVD or CVD.
- the method of the invention may further comprise a step of depositing, on the surface layer of retained ductile material, a final layer of a material chosen from the group comprising Al 2 O 3 , TiO 2 , SiO 2 and AIO , by PVD or CVD. It is also possible to provide a final layer of gold deposited by galvanic gold flash if the gold has not already been used as a ductile material for the surface layer. You can also use copper, nickel, cupro-nickel, cupro-manganese, silver, nickel-phosphorus Ni-P and nickel-boron Ni-B for the final layer, provided that the material of the final layer is different from the ductile material of the surface layer.
- This final layer has a thickness of 0.1 ⁇ m to 1 ⁇ m and makes it possible to color the hairspring or to obtain insensitivity to climatic aging (temperature and humidity).
- the ⁇ quenching step is a solution treatment, with a duration of between 5 minutes and 2 hours at a temperature between 700 ° C and 1000 ° C, under vacuum, followed by gas cooling.
- this beta quenching is a solution treatment, between 5 minutes and 1 hour at 800 ° C. under vacuum, followed by cooling under gas.
- the heat treatment is carried out for a period of between 1 hour and 80 hours, or even more, preferably between 1 hour and 15 hours at a temperature of between 350 ° C and 700 ° C. More preferably, the heat treatment is carried out for a period of between 5 hours and 10 hours at a temperature of between 350 ° C and 600 ° C. Even more preferably, the heat treatment is carried out for a period of between 3 hours and 6 hours at a temperature of between 400 ° C and 500 ° C.
- a deformation step generally designates one or more deformation treatments, which may include wire drawing and / or rolling.
- Wire drawing may require the use of one or more dies during the same deformation step or during different deformation steps if necessary.
- Wire drawing is carried out until a wire of round section is obtained.
- Rolling can be done in the same deformation step as wire drawing or in another subsequent deformation step.
- the last deformation treatment applied to the alloy is rolling, preferably with a rectangular profile compatible with the entry section of a stranding spindle.
- the total deformation rate, the number of heat treatments as well as the heat treatment parameters are chosen to obtain a spiral spring having a thermoelastic coefficient as close as possible to 0. Moreover, depending on the rate of total deformation, the number of heat treatments and the heat treatment parameters, a single-phase or two-phase NbTi alloy is obtained.
- the number of heat treatment and deformation steps is limited so that the alloy of niobium and titanium of the spiral spring obtained retains a structure in which the titanium of said alloy is essentially in the form of solid solution with niobium in ⁇ phase (centered cubic structure), the titanium content in ⁇ phase being less than or equal to 10% by volume, preferably less than or equal to 5% by volume, more preferably less than or equal to 2.5% in volume.
- the total deformation rate is between 1 and 5, preferably between 2 and 5.
- a blank is used, the dimensions of which are as close as possible to the desired final dimensions so as to limit the number of heat treatment and deformation steps and to maintain an essentially single-phase structure ⁇ of the NbTi alloy.
- the final structure of the NbTi alloy of the spiral spring may be different from the initial structure of the blank, for example the titanium content in ⁇ form may have varied, the main thing being that the final structure of the NbTi alloy of the spiral spring is essentially single-phase, the titanium of said alloy being essentially in the form of a solid solution with niobium in ⁇ phase, the titanium content in ⁇ phase being less than or equal to 10% by volume, preferably less than or equal to 5% in volume, more preferably less than or equal to 2.5% by volume.
- the titanium content in the ⁇ phase is preferably less than or equal to 5% by volume, more preferably less than or equal to 2.5% by volume, or even close to or equal to 0.
- a spiral spring is obtained made of an NbTi alloy having an essentially single-phase structure in the form of a solid ⁇ -Nb-Ti solution, the titanium content in the ⁇ form being less than or equal to 10% by volume.
- the method comprises a single deformation step with a deformation rate of between 1 and 5, preferably between 2 and 5.
- a particularly preferred method of the invention comprises, after the quenching step ⁇ , the step of depositing, on the alloy blank, the surface layer of ductile material, a deformation step including drawing by means of several dies followed by rolling, a stretching step then a final heat treatment step (called fixing).
- the method of the invention may further comprise at least one intermediate heat treatment step, so that the method comprises for example after the hardening step ⁇ , the step of depositing, on the alloy blank, the surface layer of ductile material, a first deformation step, an intermediate heat treatment step, a second deformation step, the slitting step then a last heat treatment step.
- a succession of sequences of a deformation step alternating with a heat treatment step is applied, until an alloy of niobium and titanium with a two-phase structure comprising a solid solution of niobium with titanium in ⁇ phase (centered cubic structure) and a solid solution of niobium with titanium in ⁇ phase (compact hexagonal structure), the content of titanium in ⁇ phase being greater than 10% by volume.
- heat treatments it is necessary to precipitate part of the ⁇ phase by heat treatments, according to the parameters indicated above, with a strong deformation between the heat treatments.
- heat treatments longer than those used to obtain a single-phase spring alloy are applied, for example heat treatments carried out for a period of between 15 hours and 75 hours at a temperature of between 350 ° C and 500 ° C. .
- heat treatments are applied from 75h to 400h at 350 ° C, from 25h to 400 ° C or from 18h to 480 ° C.
- a blank is used which has, after hardening ⁇ , a much larger diameter than that of the blank prepared for the first “single-phase” variant.
- a blank with a diameter of 30 mm is used, for example, after the hardening ⁇
- a blank with a diameter of 0.2 to 2.0 mm is used after the hardening ⁇ .
- each strain is carried out with a strain rate of between 1 and 5, the global accumulation of strains over the whole of said succession of sequences bringing a total strain rate of between 1 and 14.
- the strain rate corresponds to the classic formula 2ln (d0 / d), where d0 is the diameter of the last beta hardening or that of a deformation step, and d is the diameter of the hardened wire obtained in the step of next deformation.
- the method comprises in this second variant between three and five coupled sequences of deformation-heat treatment.
- the first coupled strain-heat treatment sequence comprises a first strain with at least 30% reduction in section.
- each coupled sequence of heat-treatment-strain comprises a strain between two heat treatments with at least 25% reduction in section.
- the hardened ⁇ phase alloy exhibits a strongly positive CT, and the precipitation of the ⁇ phase which has a strongly negative CT, makes it possible to bring the two-phase alloy to a CTE close to zero, which is particularly important. favorable.
- the method of the invention allows the production, and more particularly the shaping, of a balance spring for a balance in a niobium-titanium type alloy, typically containing 47% by weight of titanium (40-60%), exhibiting a Substantially single-phase microstructure of ⁇ -Nb-Ti in which the titanium is in the form of a solid solution with the niobium in the ⁇ phase or a very fine two-phase lamellar microstructure comprising a solid solution of niobium with titanium in the ⁇ phase and a solid solution of niobium with titanium in phase a.
- This alloy has high mechanical properties, by combining a very high elastic limit, greater than 600 MPa, and a very low modulus of elasticity, of the order of 60 Gpa to 80 GPa. This combination of properties is well suited for a spiral spring.
- Such an alloy is known and used for the manufacture of superconductors, such as magnetic resonance imaging devices, or particle accelerators, but is not used in watchmaking.
- a binary type alloy comprising niobium and titanium, of the type selected above for the implementation of the invention also exhibits an effect similar to that of “Elinvar”, with a thermoelastic coefficient practically zero. within the temperature range of usual use of watches, and suitable for the manufacture of self-compensating balance springs.
- such an alloy is paramagnetic.
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Claims (18)
- Verfahren zum Herstellen einer Spiralfeder zur Ausstattung einer Unruh eines Uhrwerks, umfassend:einen Schritt zum Ausarbeiten eines Rohlings aus einer Legierung aus Niob und Titan, die gebildet ist aus:- Niob: Differenz auf 100 Gew.-%,- Titan: zwischen 40 und 60 Gew.-%,- Spuren von Elementen, die aus der Gruppe ausgewählt sind, die aus O, H, C, Fe, Ta, N, Ni, Si, Cu und Al gebildet ist, wobei jedes der Elemente in einer Menge im Bereich von 0 bis 1600 Gew.-ppm vorhanden ist, wobei die Gesamtmenge, die durch alle diese Elemente gebildet ist, im Bereich von 0 bis 0,3 Gew.-% liegt,- einen Typ-β-Härtungsschritt des Rohlings mit einem bestimmten Durchmesser, derart, dass das Titan der Legierung im Wesentlichen als solide Lösung mit Niob in der β-Phase vorliegt, wobei der Gehalt an Titan in der α-Phase kleiner oder gleich 5 Vol.-% ist,- mindestens einen Schritt des Verformens der Legierung im Wechsel mit mindestens einem Schritt einer Wärmebehandlung, derart, dass die erhaltene Legierung aus Niob und Titan eine Elastizitätsgrenze größer oder gleich 600 MPa und einen Elastizitätsmodul kleiner oder gleich 100 GPa aufweist, wobei vor dem letzten Wärmebehandlungsschritt ein Federwindungsschritt zum Bilden der Spiralfeder durchgeführt wird,wobei das Verfahren vor dem Verformungsschritt einen Schritt des Ablagerns einer Oberflächenschicht auf dem Legierungsrohling aus einem duktilen Material umfasst, das aus der Gruppe ausgewählt ist, die Kupfer, Nickel, Kupfernickel, Kupfermangan, Gold, Silber, Nickelphosphor Ni-P und Nickelbor Ni-B enthält, um die Drahtformung zu erleichtern, wobei die Dicke der abgelagerten Schicht aus duktilem Material so gewählt ist, dass das Flächenverhältnis aus duktilem Material zu der Oberfläche der NbTi-Legierung für einen bestimmten Drahtquerschnitt kleiner als 1, vorzugsweise kleiner als 0,5 ist und besonders bevorzugt im Bereich von 0,01 bis 0,4 liegt.
- Herstellungsverfahren nach Anspruch 1, dadurch gekennzeichnet, dass es nach dem Verformungsschritt einen Schritt zum Entfernen der Oberflächenschicht aus duktilem Material umfasst.
- Herstellungsverfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Oberflächenschicht aus duktilem Material beibehalten wird, wobei der thermoelastische Koeffizient der Legierung aus Niob und Titan entsprechend angepasst wird.
- Herstellungsverfahren nach Anspruch 3, dadurch gekennzeichnet, dass es einen Schritt zum Ablagern auf der beibehaltenen Oberflächenschicht aus duktilem Material einer Abschlussschicht aus einem Material umfasst, das aus der Gruppe ausgewählt ist, die Kupfer, Nickel, Kupfernickel, Kupfermangan, Silber, Nickelphosphor Ni-P, Nickelbor Ni-B, Gold, die anders als für das duktile Material der Oberflächenschicht ausgewählt werden, Al2O3, TiO2, SiO2 und AlO enthält.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Verformungsschritt Drahtziehen und/oder Walzen umfasst.
- Verfahren nach Anspruch 5, dadurch gekennzeichnet, dass die letzte auf die Legierung angewendete Verformungsverarbeitung das Walzen ist.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Ausmaß der Gesamtverformung, die Anzahl von Wärmbehandlungen sowie die Parameter der Wärmebehandlungen so gewählt werden, dass man eine Spiralfeder mit einem thermoelastischen Koeffizienten möglichst nahe 0 erhält.
- Herstellungsverfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der β-Härtungsschritt eine Behandlung ist zum Einbringen in Lösung für eine Dauer von 5 Minuten bis 2 Stunden bei einer Temperatur zwischen 700 °C und 1000 °C unter Vakuum, gefolgt von einer Abkühlung unter Gas.
- Herstellungsverfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Wärmebehandlung für eine Dauer von 1 Stunde bis 80 Stunden bei einer Temperatur zwischen 350 °C und 700 °C ausgeführt wird.
- Herstellungsverfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Anzahl der Wärmbehandlungs- und Verformungsschritte begrenzt ist, so dass die Legierung aus Niob und Titan der erhaltenen Spiralfeder eine Struktur beibehält, in der das Titan der Legierung im Wesentlichen in Form einer soliden Lösung mit Niob in der β-Phase vorliegt, wobei der Gehalt an Titan in der α-Phase kleiner oder gleich 10 Vol.-% ist.
- Verfahren nach Anspruch 10, dadurch gekennzeichnet, dass es einen einzigen Verformungsschritt mit einem Verformungsausmaß im Bereich von 1 bis 5, vorzugsweise von 2 bis 5, umfasst.
- Verfahren nach einem der Ansprüche 10 bis 11, dadurch gekennzeichnet, dass es nach dem β-Härtungsschritt einen Verformungsschritt, einen Federwindungsschritt und einen Wärmebehandlungsschritt umfasst.
- Verfahren nach Anspruch 12, dadurch gekennzeichnet, dass es einen Zwischenschritt zur Wärmebehandlung umfasst.
- Herstellungsverfahren nach einem der Ansprüche 10 bis 13, dadurch gekennzeichnet, dass die Wärmebehandlung für eine Dauer von 5 Stunden bis 10 Stunden bei einer Temperatur zwischen 350 °C und 600 °C ausgeführt wird.
- Herstellungsverfahren nach Anspruch 14, dadurch gekennzeichnet, dass die Wärmebehandlung für eine Dauer von 3 Stunden bis 6 Stunden bei einer Temperatur zwischen 400 °C und 500 °C ausgeführt wird.
- Herstellungsverfahren nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass eine Folge von Sequenzen eines Verformungsschrittes im Wechsel mit einem Wärmebehandlungsschritt bis zum Erhalt einer Legierung aus Niob und Titan mit einer zweiphasigen Struktur angewendet wird, die eine solide Lösung aus Niob mit Titan in der β-Phase und eine solide Lösung aus Niob mit Titan in der α-Phase enthält, wobei der Gehalt an Titan in der α-Phase größer als 10 Vol.- % ist.
- Herstellungsverfahren nach Anspruch 16, dadurch gekennzeichnet, dass jede Verformung mit einem Verformungsausmaß im Bereich von 1 bis 5 ausgeführt wird, wobei die Gesamtsumme von Verformungen über die gesamte Folge von Sequenzen zu einer Gesamtverformungsrate im Bereich von 1 bis 14 führt.
- Herstellungsverfahren nach einem der Ansprüche 16 bis 17, dadurch gekennzeichnet, dass die Wärmebehandlung für eine Dauer von 15 Stunden bis 75 Stunden bei einer Temperatur zwischen 350 °C und 500 °C ausgeführt wird.
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EP17209686.9A EP3502288B1 (de) | 2017-12-21 | 2017-12-21 | Herstellungsverfahren einer spiralfeder für uhrwerk |
US16/211,289 US20190196406A1 (en) | 2017-12-21 | 2018-12-06 | Method for manufacturing a balance spring for a timepiece movement |
JP2018234274A JP6751749B2 (ja) | 2017-12-21 | 2018-12-14 | 時計器ムーブメント用のヒゲゼンマイを製造するための方法 |
RU2018145229A RU2696809C1 (ru) | 2017-12-21 | 2018-12-20 | Способ изготовления волоска для часового механизма |
CN201811562272.5A CN110007582B (zh) | 2017-12-21 | 2018-12-20 | 制造钟表机芯的游丝的方法 |
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EP17209686.9A EP3502288B1 (de) | 2017-12-21 | 2017-12-21 | Herstellungsverfahren einer spiralfeder für uhrwerk |
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Cited By (1)
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RU2801078C1 (ru) * | 2021-07-23 | 2023-08-01 | Ниварокс-Фар С.А. | Пружина баланса для механизма, относящегося к измерению времени |
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EP3422116B1 (de) * | 2017-06-26 | 2020-11-04 | Nivarox-FAR S.A. | Spiralfeder eines uhrwerks |
EP3796101A1 (de) * | 2019-09-20 | 2021-03-24 | Nivarox-FAR S.A. | Spiralfeder für uhrwerk |
EP3828642A1 (de) * | 2019-11-29 | 2021-06-02 | Nivarox-FAR S.A. | Spiralfeder für uhrwerk und herstellungsverfahren dafür |
EP4009114A1 (de) * | 2019-12-31 | 2022-06-08 | Nivarox-FAR S.A. | Spiralfeder für uhrwerk und ihr herstellungsverfahren |
EP3885842B1 (de) | 2020-03-26 | 2024-03-20 | Nivarox-FAR S.A. | Nichtmagnetische uhrkomponente mit verbesserter verschleissfestigkeit |
EP4060425A1 (de) | 2021-03-16 | 2022-09-21 | Nivarox-FAR S.A. | Spiralfeder für uhrwerk |
EP4060424A1 (de) | 2021-03-16 | 2022-09-21 | Nivarox-FAR S.A. | Spiralfeder für uhrwerk |
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Cited By (1)
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RU2801078C1 (ru) * | 2021-07-23 | 2023-08-01 | Ниварокс-Фар С.А. | Пружина баланса для механизма, относящегося к измерению времени |
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EP3502288A1 (de) | 2019-06-26 |
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