EP0273359B1 - Elément de boîte de montre - Google Patents

Elément de boîte de montre Download PDF

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Publication number
EP0273359B1
EP0273359B1 EP87119033A EP87119033A EP0273359B1 EP 0273359 B1 EP0273359 B1 EP 0273359B1 EP 87119033 A EP87119033 A EP 87119033A EP 87119033 A EP87119033 A EP 87119033A EP 0273359 B1 EP0273359 B1 EP 0273359B1
Authority
EP
European Patent Office
Prior art keywords
watchcase
workpiece
base part
worked
cemented carbide
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
EP87119033A
Other languages
German (de)
English (en)
Other versions
EP0273359A2 (fr
EP0273359A3 (en
Inventor
Nobutaka Chiba
Hiroshi Namiki Precision Jewel Co. Ltd. Matsumura
Kenichi Namiki Precision Jewel Co. Ltd. Sakai
Masao Itami Works Maruyama
Atsushi Itami Works Seki
Yoshihiro Itami Works Minato
Yoshiki Itami Works Maeda
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.)
Namiki Precision Jewel Co Ltd
Sumitomo Electric Industries Ltd
Original Assignee
Namiki Precision Jewel Co Ltd
Sumitomo Electric Industries Ltd
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 Namiki Precision Jewel Co Ltd, Sumitomo Electric Industries Ltd filed Critical Namiki Precision Jewel Co Ltd
Publication of EP0273359A2 publication Critical patent/EP0273359A2/fr
Publication of EP0273359A3 publication Critical patent/EP0273359A3/en
Application granted granted Critical
Publication of EP0273359B1 publication Critical patent/EP0273359B1/fr
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
    • G04B37/00—Cases
    • G04B37/22—Materials or processes of manufacturing pocket watch or wrist watch cases
    • 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
    • G04B37/00—Cases
    • G04B37/08—Hermetic sealing of openings, joints, passages or slits

Definitions

  • the present invention relates to a workpiece for a watchcase as defined in the preample of claim 1.
  • a hard alloy is generally employed for a case or a wrist watch, which is easily scratched.
  • cemented carbide is employed as a material for the watchcase of a high-grade wrist watch.
  • an extremely hard material such as cemented carbide causes a problem in working, in employment for a watchcase.
  • an inner portion of the watchcase i.e., an inner shell portion which is adapted to store precisely designed watch parts.
  • an inner shell portion which is adapted to store precisely designed watch parts.
  • a tapped hole is formed in the watchcase by electric discharge machining, and thereafter a thread bush of a workable material is embedded in the tapped hole, to be subjected to brazing.
  • the workpiece for the watchcase is prepared by cemented carbide, therefore, workability in electric discharge machining of the tapped hole is particularly inferior, to require a long time for such working.
  • GB-A- 2 094 034 discloses a workpiece for a watchcase comprising a cemented carbide base part and a worked part to be machined, i.e. made of a material being superior in machinability to that of said base part, joined with said base part.
  • an outer case band is joined to its inner counterpart or a supporting ring by brazing.
  • GB-A- 2 000 812 refers to coated articles with a gold coloured outer surface, for example watch cases, where the coating is a material selected from TaC or a nitride of Ti, Ta, Zr or V.
  • CH-B- 656 146 discloses sintered alloys for decorative articles, for example watches, with improved outer appearance and wear resistance.
  • the object of the present invention is to provide a workpiece for a watchcase, which is excellent in machinability and manufactured at a low cost.
  • the workpiece for a watchcase according to the invention is characterized in that the worked part and the base part are joined by sintering from diffused junction, said base part being prepared from WC-Co cemented carbide or TaC-Ni cemented carbide, and said worked part being prepared from Mo, W or Ta for a WC-Co cemented carbide base part and Mo or a W-Ni alloy for a TaC-Ni cemented carbide base part and in that said diffused junction is achieved by sequentially performing HIP after said sintering from diffusion junction.
  • the worked part of the inventive workpiece for a watchcase can be easily machined in high accuracy, to require no electric discharge machining for a long time as in the conventional case.
  • diffused junction is employed in order to join the worked part of the inventive workpiece for a watchcase to the base part. Therefore, the worked part can be joined to the base part simultaneously with sintering of the base part to require no brazing step of the conventional case, for example. Thus, steps for manufacturing the workpiece can be extremely simplified.
  • the material of excellent machinability is joined by diffused junction to the worked part of the inventive workpiece for a watchcase, which can be easily machined in high accuracy.
  • the workpiece according to the present invention can be worked in a short time with no electric discharge machining, which has been generally required in the prior art.
  • the worked part can be joined to the base part in sintering or HIP forming of the base part.
  • no conventional brazing step is required and the manufacturing steps can be extremely simplified, whereby the workpiece according to the present invention can be manufactured at a low cost.
  • a sintered worked part 2 was embedded in a hole 1a of an unsintered base part 1, which was then sintered and subjected to HIP forming to provide a workpiece for a watchcase.
  • Table 1 shows combinations of materials for such base parts and worked parts.
  • the worked part 2 of each workpiece for a watchcase thus obtained was subjected to tapped hole working as shown in Fig. 2, and workability thereof was evaluated as an index. Evaluation was made on working steps and working ability thereof. The working steps were formed by a tapped hole working (drilling) step and a screw cutting step, and the average value in working ability of the two steps was expressed as an index.
  • a worked part 4 was joined by diffused junction to a base part 3 forming an inner shell portion of a watchcase.
  • Fig. 4 is a sectional view taken along the line IV - IV of Fig. 3.
  • Table 2 shows combinations of materials for such base parts and worked parts. Diffused junction of each Example was performed by bringing a sintered worked part into close contact with an unsintered base part, sintering the base part in this state and then performing HIP forming.
  • each workpiece according to the embodiment of the present invention can be worked in a short time as compared with the case of working the workpiece formed by only a base part by electric discharge machining.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Powder Metallurgy (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)

Claims (3)

  1. Pièce façonnée pour un boîtier de montre, comportant une partie de base en carbure cémenté (1,3), et une partie façonnée (2,4) à usiner, c'est-à-dire composée d'un matériau d'usinabilité supérieure à celui de ladite partie de base (1,3), relié à ladite partie de base (1,3), caractérisée en ce que la partie usinée (2,4) et la partie de base (1,3) sont reliées par frittage de la jonction diffusée, ladite partie de base (1,3) étant préparée à partir d'un carbure de WC-Co cémenté ou d'un carbure de TaC-Ni cémenté, et ladite partie façonnée (2,4) étant préparée à partir de Mo, W ou Ta, pour une partie de base (1,3) en carbure de WC-Co cémenté, et d'un alliage à base de W-Ni pour une partie de base (1,3) en carbure de TaC-Ni cémenté, et en ce que ladite jonction diffusée est obtenue en effectuant séquentiellement une HIP, après ledit frittage de ladite fonction à diffusion.
  2. Pièce façonnée pour un boîtier de montre selon la revendication 1, dans laquelle ladite partie façonnée (2,4) est une partie soumise à un usinage d'un trou taraudé.
  3. Pièce façonnée pour un boîtier de montre selon la revendication 1, dans laquelle ladite partie façonnée (2,4) est une partie d'enveloppe intérieure dudit boîtier de montre.
EP87119033A 1986-12-29 1987-12-22 Elément de boîte de montre Expired - Lifetime EP0273359B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP314191/86 1986-12-29
JP61314191A JPS63168585A (ja) 1986-12-29 1986-12-29 時計枠用加工素材およびその製造方法

Publications (3)

Publication Number Publication Date
EP0273359A2 EP0273359A2 (fr) 1988-07-06
EP0273359A3 EP0273359A3 (en) 1989-05-10
EP0273359B1 true EP0273359B1 (fr) 1993-09-08

Family

ID=18050356

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87119033A Expired - Lifetime EP0273359B1 (fr) 1986-12-29 1987-12-22 Elément de boîte de montre

Country Status (4)

Country Link
EP (1) EP0273359B1 (fr)
JP (1) JPS63168585A (fr)
KR (1) KR940001046B1 (fr)
DE (1) DE3787360T2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003027777A1 (fr) * 2001-09-21 2003-04-03 Citizen Watch Co., Ltd. Boîtier de montre et procédé de fabrication

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50126468A (fr) * 1974-03-26 1975-10-04
JPS53149149A (en) * 1977-06-01 1978-12-26 Hitachi Ltd Diffusion welding method
US4252862A (en) * 1977-06-10 1981-02-24 Nobuo Nishida Externally ornamental golden colored part
JPS5588991A (en) * 1978-12-27 1980-07-05 Seiko Epson Corp Production of external decorative parts for portable watch
GB2094034B (en) * 1981-02-20 1985-01-30 Citizen Watch Co Ltd Structure of watch case
JPS58128281A (ja) * 1982-01-27 1983-07-30 Hitachi Ltd 超硬合金と鋼との拡散接合方法
US4702769A (en) * 1982-05-21 1987-10-27 Toshiba Tungaloy Co., Ltd. Sintered alloy for decoration
JPS6240357A (ja) * 1985-08-14 1987-02-21 Seiko Instr & Electronics Ltd 溶射ケ−スの製造方法

Also Published As

Publication number Publication date
KR940001046B1 (ko) 1994-02-08
DE3787360D1 (de) 1993-10-14
EP0273359A2 (fr) 1988-07-06
DE3787360T2 (de) 1994-01-13
JPS63168585A (ja) 1988-07-12
KR880008097A (ko) 1988-08-30
EP0273359A3 (en) 1989-05-10
JPH0575277B2 (fr) 1993-10-20

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