EP1538492B1 - Emailliertes Zifferblatt mit Füsse und sein Herstellungsverfahren dafür - Google Patents

Emailliertes Zifferblatt mit Füsse und sein Herstellungsverfahren dafür Download PDF

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Publication number
EP1538492B1
EP1538492B1 EP03027684A EP03027684A EP1538492B1 EP 1538492 B1 EP1538492 B1 EP 1538492B1 EP 03027684 A EP03027684 A EP 03027684A EP 03027684 A EP03027684 A EP 03027684A EP 1538492 B1 EP1538492 B1 EP 1538492B1
Authority
EP
European Patent Office
Prior art keywords
substrate
feet
dial
enamelled
layer
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.)
Expired - Lifetime
Application number
EP03027684A
Other languages
English (en)
French (fr)
Other versions
EP1538492A1 (de
Inventor
Steve Bourban
Rudolf Dinger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Asulab AG
Original Assignee
Asulab AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Asulab AG filed Critical Asulab AG
Priority to EP03027684A priority Critical patent/EP1538492B1/de
Priority to CH02059/03A priority patent/CH697052A5/fr
Priority to DE60321186T priority patent/DE60321186D1/de
Publication of EP1538492A1 publication Critical patent/EP1538492A1/de
Priority to HK05111120.5A priority patent/HK1079297A1/xx
Application granted granted Critical
Publication of EP1538492B1 publication Critical patent/EP1538492B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • G04B19/00—Indicating the time by visual means
    • G04B19/06—Dials
    • G04B19/10—Ornamental shape of the graduations or the surface of the dial; Attachment of the graduations to the dial
    • 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
    • G04B19/00—Indicating the time by visual means
    • G04B19/06—Dials
    • G04B19/12—Selection of materials for dials or graduations markings
    • 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
    • G04B19/00—Indicating the time by visual means
    • G04B19/06—Dials
    • G04B19/14—Fastening the dials to the clock or watch plates
    • G—PHYSICS
    • G04—HOROLOGY
    • G04D—APPARATUS OR TOOLS SPECIALLY DESIGNED FOR MAKING OR MAINTAINING CLOCKS OR WATCHES
    • G04D3/00—Watchmakers' or watch-repairers' machines or tools for working materials
    • G04D3/0002—Watchmakers' or watch-repairers' machines or tools for working materials for mechanical working other than with a lathe
    • G04D3/0043—Watchmakers' or watch-repairers' machines or tools for working materials for mechanical working other than with a lathe for components of the time-indicating mechanisms
    • G04D3/0048—Watchmakers' or watch-repairers' machines or tools for working materials for mechanical working other than with a lathe for components of the time-indicating mechanisms for dials

Definitions

  • the present invention relates to an enamelled dial with feet, including an enamelled dial for a timepiece.
  • the invention also relates to a method for manufacturing such a dial, and to fix the feet with a precision requiring no retouch for later positioning in the housings provided in the plate.
  • a template slightly larger than the shape of the wrist is cut out.
  • dial drill holes for copper dial feet, then rivet / weld the feet. It will be observed that no opening, such as the passageways of needles or wickets, is made in the base plate, on the one hand not to weaken it, on the other hand to avoid the formation of wells during enameling.
  • a second step after bending, is deposited an enamel composition on both sides of the plate, by known methods, such as soaking, screen printing or sieving. In the latter case, the underside is previously coated with an adhesive.
  • the dial thus prepared is then passed to the oven at a temperature of between 750 ° C. and 850 ° C., depending on the composition of the enamel. The bending and the lower enamel layer make it possible to control the deformations of the dial, due to the difference between the coefficient of expansion of the copper and that of the enamel, at the end of manufacture.
  • this second step is repeated several times, namely between 2 to 5 times, until the enamel layer has a thickness of about 0.7 mm, the thickness necessary to mask the best possible unattractive appearance of the copper substrate and give the dial the desired mechanical properties.
  • a surface condition check is performed to remove unwanted inclusions and to fill the pores, and the dial is again subjected to heat treatment.
  • the third step involves tracing the dial indexes, applying a film of enamel or very fine enamel with a passage in the oven, and then pressing at a certain temperature to give the dial the optimum flatness.
  • the fourth step is to retouch on the back of the dial.
  • the "technical" enamel layer is roughly leveled, but retains a granular and porous appearance.
  • the feet which may have undergone distortions during previous handling and thermal treatments, are first removed by filing the enamel film which can cover them and then straightened so that they coincide perfectly with the housings provided in the plate. .
  • the risks of damaging an almost finished product are great. Indeed, the straightening of the feet can cause either their breakage, or cracks in the enamel layer, or even its partial detachment.
  • the present invention therefore aims to overcome the drawbacks of this prior art, by providing a method of manufacturing an enamelled dial with feet having a smaller number of steps and not requiring the repositioning of the feet at the end of manufacture, nor a grinding for the setting of the dial.
  • the subject of the invention is an enamelled dial with positioning feet in the plate of a watch movement, said dial being formed from a ceramic substrate whose outer surface is coated with one to two layers enamel and whose inner surface, on the movement side, comprises a gripping film allowing the deposition of a thicker metal layer for fixing with precision the head of the feet by gluing, This deposit can be performed, for example by galvanic growth.
  • the ceramic substrate has a light hue, the small number of enamel layers is sufficient to have, with a thickness of between 0.1 mm and 0.4 mm, a very satisfactory surface state and allows conversely have a thicker substrate.
  • the thickness of the ceramic substrate is preferably between 0.4 mm, which is a value already allowing to have satisfactory mechanical properties, and 0.9 mm.
  • the finished dial is therefore substantially the same thickness as the dials of the prior art, but with an inversion of the substrate / enamel layer thickness ratios.
  • a housing for the head said housing being designed during pressing, or subsequently produced by machining.
  • the Figure 1A represents the first step of the process consisting in coating a ceramic substrate 1 having a thickness of between 0.4 mm and 0.9 mm, preferably 0.7 mm, of one or two enamel layers having a total of thickness between 0.1 and 0.4 mm, that is to say having a substrate whose thickness is at least twice greater than that of the enamel layer. This small number of enamel layers is quite sufficient, given the clear appearance of the ceramic substrate.
  • Substrate 1 is obtained by pressing or by the well-known CIM (Ceramic Injection Molting) process, from a ceramic powder such as aluminum oxide or zirconium oxide.
  • CIM Chemical Injection Molting
  • the control of this process is currently sufficient to produce parts with a very tight tolerance requiring no further editing, especially as the very small number of enamel layers does not produce edge effects.
  • edge effects although not represented on the Figure 1A it is also possible to start from a substrate 1 having needle axis passages and possibly wickets, or to form them by machining before enameling.
  • the ceramic plate forming the substrate 1 is indeed sufficiently rigid not to be weakened by through passages.
  • the decal is also performed hourly indexes or other signs, then the frosting (not shown).
  • the second step relates to the treatment of the underside of the dial for fixing the dial foot by gluing, brazing.
  • the attachment layer 5, of the order of a few tens of nanometers, is made for example of titanium, nickel, chromium, tungsten or vanadium. Given the small thickness of the ceramic substrate 1 and the enamel layer 3, the attachment layer 5 can also act as a reflector and make the dial even brighter. As regards the deposition of the thick layer 7, whose thickness is of the order of 0.01 mm, it is made of nickel, copper or copper alloys, or gold or gold alloys, especially for high-end timepieces.
  • the third step consists in coming to fix on the thick layer 7, the head 11 of the foot 9, by gluing, welding or brazing, in the precise position that it must occupy for mounting the dial on the plate, that is to say without having to exert mechanical constraints on it to reposition it.
  • the foot 9 and its head 11 is made from a copper rod, or even gold alloy if the thick layer 7 junction is also gold.
  • a dial according to the invention obtained according to a second embodiment. It differs from the first embodiment which has just been described in that the positioning of the foot 9 is obtained even more precisely thanks to a cylindrical housing 13 provided during the manufacture of the ceramic substrate 1 or by subsequent machining.
  • the other treatments of the underside of the dial and the attachment means of the foot are also identical.

Claims (9)

  1. Emailliertes Zifferblatt mit Positionierungsfüßen, das durch ein Keramiksubstrat (1) gebildet ist, wobei die innere Oberfläche des Substrats (1) eine Verhakungsschicht (5) aufweist, auf der eine dickere Metallschicht (7) abgelagert ist, dadurch gekennzeichnet, dass die äußere Oberfläche des Substrats mit ein bis zwei Emailleschichten (3) beschichtet ist und dass der Kopf (11) der Füße (9) durch Kleben an der Metallschicht befestigt ist.
  2. Emailliertes Zifferblatt nach Anspruch 1, dadurch gekennzeichnet, dass die innere Oberfläche des Substrats (1) außerdem einen zylindrischen Aufnahmeraum (13) umfasst, der eine präzise Positionierung der Füße (9) ermöglicht.
  3. Emailliertes Zifferblatt nach Anspruch 1, dadurch gekennzeichnet, dass das Keramiksubstrat (1) eine Dicke besitzt, die wenigstens zweimal größer als die Dicke der Emailleschicht (3) ist.
  4. Emailliertes Zifferblatt nach Anspruch 1, dadurch gekennzeichnet, dass das Keramiksubstrat (1) außerdem vor der Emaillierung Zeigerwellendurchgänge und eventuell Einlässe umfasst.
  5. Emailliertes Zifferblatt nach Anspruch 1, dadurch gekennzeichnet, dass die Verhakungsschicht (5) aus Titan, Vanadium, Wolfram und Chrom gewählt ist.
  6. Emailliertes Zifferblatt nach Anspruch 1, dadurch gekennzeichnet, dass die dicke Schicht (7) aus Nickel, Kupfer oder einer Kupferlegierung, aus Chrom und aus Gold oder einer Goldlegierung gewählt ist.
  7. Verfahren zum Herstellen eines emaillierten Zifferblatts mit Füßen, dadurch gekennzeichnet, dass es die Schritte umfasst, die darin bestehen:
    - ein Keramiksubstrat (1) mit exakten Abmessungen, die für das Zifferblatt erwünscht sind, zu bilden;
    - auf die äußere Fläche des Substrats (1) eine bis zwei Emailleschichten aufzubringen;
    - auf die innere Fläche des Zifferblatts eine Verhakungsschicht (5) aufzubringen;
    - auf der Verhakungsschicht (5) eine dicke Metallablagerung (7) vorzunehmen und
    - die Füße (9) an geeigneten Stellen durch Kleben zu befestigen.
  8. Verfahren zum Herstellen eines emaillierten Zifferblatts nach Anspruch 7, dadurch gekennzeichnet, dass die innere Oberfläche des Substrats (1) außerdem einen zylindrischen Aufnahmesitz (13) aufweist, der eine präzise Positionierung der Füße (9) ermöglicht.
  9. Verfahren zum Herstellen eines emaillierten Zifferblatts nach Anspruch 7, dadurch gekennzeichnet, dass das Substrat außerdem Zeigerwellendurchgänge und eventuell Einlässe umfasst.
EP03027684A 2003-12-03 2003-12-03 Emailliertes Zifferblatt mit Füsse und sein Herstellungsverfahren dafür Expired - Lifetime EP1538492B1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP03027684A EP1538492B1 (de) 2003-12-03 2003-12-03 Emailliertes Zifferblatt mit Füsse und sein Herstellungsverfahren dafür
CH02059/03A CH697052A5 (fr) 2003-12-03 2003-12-03 Cadran émaillé avec pieds et son procédé de fabrication.
DE60321186T DE60321186D1 (de) 2003-12-03 2003-12-03 Emailliertes Zifferblatt mit Füsse und sein Herstellungsverfahren dafür
HK05111120.5A HK1079297A1 (en) 2003-12-03 2005-12-06 Enamelled watch face with feet and its fabrication method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP03027684A EP1538492B1 (de) 2003-12-03 2003-12-03 Emailliertes Zifferblatt mit Füsse und sein Herstellungsverfahren dafür

Publications (2)

Publication Number Publication Date
EP1538492A1 EP1538492A1 (de) 2005-06-08
EP1538492B1 true EP1538492B1 (de) 2008-05-21

Family

ID=34442938

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03027684A Expired - Lifetime EP1538492B1 (de) 2003-12-03 2003-12-03 Emailliertes Zifferblatt mit Füsse und sein Herstellungsverfahren dafür

Country Status (4)

Country Link
EP (1) EP1538492B1 (de)
CH (1) CH697052A5 (de)
DE (1) DE60321186D1 (de)
HK (1) HK1079297A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103576530A (zh) * 2012-07-19 2014-02-12 王辉 陶瓷表
CN107329390B (zh) * 2017-07-27 2023-06-16 广州番禺职业技术学院 一种高温珐琅表盘及其制作方法
EP3835880B1 (de) * 2019-12-10 2022-08-10 Comadur S.A. Uhrzifferblatt mit füsschen

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4881565A (de) * 1972-02-01 1973-10-31
JPS569074U (de) * 1979-06-29 1981-01-26
JPS61202184A (ja) * 1985-03-05 1986-09-06 Citizen Watch Co Ltd 時計用文字板
GB2207092A (en) * 1987-06-24 1989-01-25 Totceramica Maquinaria Machine for printing ceramic pieces

Also Published As

Publication number Publication date
DE60321186D1 (de) 2008-07-03
CH697052A5 (fr) 2008-03-31
HK1079297A1 (en) 2006-03-31
EP1538492A1 (de) 2005-06-08

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