EP0273359A2 - Elément de boîte de montre - Google Patents

Elément de boîte de montre Download PDF

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Publication number
EP0273359A2
EP0273359A2 EP87119033A EP87119033A EP0273359A2 EP 0273359 A2 EP0273359 A2 EP 0273359A2 EP 87119033 A EP87119033 A EP 87119033A EP 87119033 A EP87119033 A EP 87119033A EP 0273359 A2 EP0273359 A2 EP 0273359A2
Authority
EP
European Patent Office
Prior art keywords
watchcase
workpiece
accordance
worked
diffused junction
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
Application number
EP87119033A
Other languages
German (de)
English (en)
Other versions
EP0273359B1 (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 employed for a watchcase of a wrist watch.
  • a hard alloy is generally employed for a case of 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.
  • An 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 present invention comprises a worked part to be machined and a base part joined through diffused junction with the worked part, which is prepared by a material being superior in machinability to that for the base part.
  • 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 worked part is prepared by a material which is superior in machinability to that for the base part.
  • the worked part is preferably prepared by a metal selected from groups IV, V and VI of the periodic table or an alloy of two or more such metals.
  • the material for the worked part is preferably prepared by Mo, W or Ta, most preferably by Mo in view of junction strength.
  • the cemented carbide is TaC-Ni cemented carbide
  • the worked part is preferably prepared by Mo or a W-Ni alloy, most preferably by the W-Ni alloy in view of junction strength.
  • Diffused junction in the present invention is preferably performed by sintering diffused junction or HIP (hot isostatic pressing) diffused junction in view of manufacturing steps.
  • sintering diffused junction and HIP diffused junction may be combined with each other.
  • HIP diffused junction may be performed after sintering diffused junction, or sintering diffused junction and HIP diffused junction may be simultaneously performed.
  • a sintered worked part may be brought into close contact with an unsintered base part, which in turn is sintered in this state, to thereafter perform HIP forming.
  • an unsintered worked part may be brought into close contact with an unsintered base part so that both of the base part and the worked part are sintered in this state, to thereafter perform HIP forming.
  • a sintered worked part may be brought into close contact with a sintered base part to be re-sintered, to thereafter to perform HIP forming.
  • carbide of the material for the worked part is formed in the junction interface in diffused junction, to improve junction strength.
  • a 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)
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 true EP0273359A2 (fr) 1988-07-06
EP0273359A3 EP0273359A3 (en) 1989-05-10
EP0273359B1 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
DE60221874T2 (de) 2001-09-21 2008-01-17 Citizen Holdings Co., Ltd., Nishitokyo Externes teil einer uhr und verfahren zu herstellung des teils

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2000812A (en) * 1977-06-10 1979-01-17 Nishida N Externally ornamental golden colour part
GB2094034A (en) * 1981-02-20 1982-09-08 Citizen Watch Co Ltd Structure of watch case
CH656146A5 (de) * 1982-05-21 1986-06-13 Toshiba Tungaloy Co Ltd Gesinterte legierung fuer dekorationszwecke.
JPS6240357A (ja) * 1985-08-14 1987-02-21 Seiko Instr & Electronics Ltd 溶射ケ−スの製造方法

Family Cites Families (4)

* 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
JPS5588991A (en) * 1978-12-27 1980-07-05 Seiko Epson Corp Production of external decorative parts for portable watch
JPS58128281A (ja) * 1982-01-27 1983-07-30 Hitachi Ltd 超硬合金と鋼との拡散接合方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2000812A (en) * 1977-06-10 1979-01-17 Nishida N Externally ornamental golden colour part
GB2094034A (en) * 1981-02-20 1982-09-08 Citizen Watch Co Ltd Structure of watch case
CH656146A5 (de) * 1982-05-21 1986-06-13 Toshiba Tungaloy Co Ltd Gesinterte legierung fuer dekorationszwecke.
JPS6240357A (ja) * 1985-08-14 1987-02-21 Seiko Instr & Electronics Ltd 溶射ケ−スの製造方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 11, no. 229 (C-436)[2676], 25th July 1987; & JP-A-62 040 357 (SEIKO INSTR & ELECTRONICS LTD) 21-02-1987 *

Also Published As

Publication number Publication date
EP0273359B1 (fr) 1993-09-08
JPH0575277B2 (fr) 1993-10-20
DE3787360T2 (de) 1994-01-13
KR940001046B1 (ko) 1994-02-08
KR880008097A (ko) 1988-08-30
EP0273359A3 (en) 1989-05-10
JPS63168585A (ja) 1988-07-12
DE3787360D1 (de) 1993-10-14

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