EP0286948B1 - Werkstück für ein Armband - Google Patents

Werkstück für ein Armband Download PDF

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Publication number
EP0286948B1
EP0286948B1 EP88105412A EP88105412A EP0286948B1 EP 0286948 B1 EP0286948 B1 EP 0286948B1 EP 88105412 A EP88105412 A EP 88105412A EP 88105412 A EP88105412 A EP 88105412A EP 0286948 B1 EP0286948 B1 EP 0286948B1
Authority
EP
European Patent Office
Prior art keywords
link
worked
accordance
cemented carbide
watch band
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
EP88105412A
Other languages
English (en)
French (fr)
Other versions
EP0286948A2 (de
EP0286948A3 (en
Inventor
Nobutaka Chiba
Youichi Namiki Precision Jewel Co. Ltd. Kikuchi
Hiroshi Namiki Precision Jewel Co. Ltd. Matsumara
Masao Itami Works Maruyama
Atsushi Itami Works Seki
Yoshihiro Itami Works Minato
Toshimitsu Itami Works Sakata
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 EP0286948A2 publication Critical patent/EP0286948A2/de
Publication of EP0286948A3 publication Critical patent/EP0286948A3/en
Application granted granted Critical
Publication of EP0286948B1 publication Critical patent/EP0286948B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
    • B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
    • C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
    • C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
    • C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
    • C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
    • C22C29/08—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds based on tungsten carbide

Definitions

  • the present invention relates to a watch band link employed for forming a watch band for a wrist watch.
  • a band for a wrist watch which is easily scratched, is preferably formed by a hard alloy.
  • cemented carbide is employed as a material for the band of a high-grade wrist watch.
  • parts of cemented carbide for a watch band may be formed to be previously provided with such holes.
  • sufficient dimensional accuracy cannot be attained if the parts are previously formed to have holes of desired diameters.
  • the EP-A-0 169 292 discloses wearparts or cutting tools.
  • the part comprises a composite structure body having a core consisting of high speed steel or tool steel and a cover consisting of a material being difficult to ground.
  • the US-A-3 837 163 discloses a mar-proof watch-band of materials having a hardness greater than Hv 1,000.
  • the watch-band consists of materials like hard nitrides, oxides and carbides in combination with metallic binders.
  • the object of the present invention is to provide a watch-band link of excellent machinability for a watch band, which can be manufactured at a low cost, by employing unscratchable cemented carbide.
  • the workpiece for a watch band link according to the present invention comprises a worked part to be machined and a base part joined through a diffusion junction with the worked part, which is prepared by a material which is superior in machinability to the base part.
  • the worked part of the watch band link according to the invention can be easily machined in high accuracy, to require no electric discharge machining for a long time as in the conventional case.
  • a diffused junction is employed in order to join the worked part to the base part. Therfore, the worked part can be joined to the base part simultaneously with sintering of the base part.
  • steps for manufacturing the watch band link are not complicated.
  • the watch band link according to the invention is given in claim 1.
  • the worked part of the watch band link of the invention consists of 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 IVa, Va and VIa 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.
  • a diffused junction is preferably performed by sintering or HIP (hot isostatic pressing).
  • Sintering and HIP may be combined with each other.
  • HIP may be performed after sintering, or sintering and HIP 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 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 workpiece for watch band link according to the invention, which can be easily machined to obtain watch band links of high dimensional accuracy.
  • the worked part can be worked by general machining with no electric discharge machining, which has been generally required in the prior art, whereby the working time can be extremely reduced.
  • the worked part can be joined to the base part in sintering or HIP forming of the base part.
  • the manufacturing steps are not complicated.
  • Figs. 1 and 2 are a front sectional view and a side elevational view showing a workpiece for a watch band link according to an embodiment of the present invention.
  • a workpiece 1 for a watch band link comprises a base part 2 of cemented carbide and worked parts 3 embedded in holes formed in the base part 2. This workpiece 1 is obtained by embedding sintered worked parts 3 in the holes of the base part 2 being in an unsintered state, sintering the base part 2 and thereafter performing HIP forming.
  • non-through type holes may be formed from both of longitudinal end portions of the workpiece 1 toward its center to be filled with the worked parts 3, which are then provided with holes respectively to receive pins in both of longitudinal end portions.
  • the holes to be filled with the worked parts 3 are not restricted to be circular in section as shown in the drawings, but the same may be provided in an arbitrary sectional configuration such as a square one.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Composite Materials (AREA)
  • Manufacturing & Machinery (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Powder Metallurgy (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Claims (9)

  1. Ein Uhrbandglied umfassend ein Grundteil aus Sinterkarbid mit Grundlöchern oder Durchgangslöchern, die mit Buchsen zur Aufnahme von Verbindungsbolzen, die die Uhrbandglieder miteinander verbinden, versehen sind, dadurch gekennzeichnet, daß
    die Buchsen aus bearbeiteten Teilen (3) geformt werden, die aus einem Metall aus den Gruppen IVa, Va und VIa des Periodensystems oder einer Legierung aus zwei oder mehreren dieser Metalle bestehen und mit dem Grundteil (2) durch eine Diffusionsverbindung verbunden werden, wobei die Buchse durch das Bearbeiten des bearbeiteten Teils (3) geformt wird, welcher eine höhere maschinelle Bearbeitbarkeit aufweist als der Grundteil (2).
  2. Ein Glied nach Anspruch 1, wobei das Sinterkarbid WC-Co Sinterkarbid ist.
  3. Ein Glied nach Anspruch 1, wobei das Sinterkarbid TaC-Ni Sinterkarbid ist.
  4. Ein Glied nach Anspruch 2, wobei der bearbeitete Teil (3) aus Mo, W oder Ta hergestellt wird.
  5. Ein Glied nach Anspruch 3, wobei der bearbeitete Teil (3) aus Mo oder einer W-Ni Legierung hergestellt wird.
  6. Ein Glied nach Anspruch 1, wobei die Diffusionsverbindung eine Sinterdiffusionsverbindung ist.
  7. Ein Glied nach Anspruch 1, wobei die Diffusionsverbindung eine isostatische Heißpreßdiffusionsverbindung ist.
  8. Ein Glied nach Anspruch 1, wobei die Diffusionsverbindung durch aufeinanderfolgendes Sintern und isostatisches Heißpressen erreicht wird.
  9. Ein Glied nach Anspruch 1, wobei die Diffusionsverbindung durch gleichzeitiges Sintern und isostatisches Heißpressen erreicht wird.
EP88105412A 1987-04-08 1988-04-05 Werkstück für ein Armband Expired - Lifetime EP0286948B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP86315/87 1987-04-08
JP62086315A JPS63252681A (ja) 1987-04-08 1987-04-08 時計バンド用加工素材

Publications (3)

Publication Number Publication Date
EP0286948A2 EP0286948A2 (de) 1988-10-19
EP0286948A3 EP0286948A3 (en) 1989-12-06
EP0286948B1 true EP0286948B1 (de) 1992-08-12

Family

ID=13883399

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88105412A Expired - Lifetime EP0286948B1 (de) 1987-04-08 1988-04-05 Werkstück für ein Armband

Country Status (4)

Country Link
EP (1) EP0286948B1 (de)
JP (1) JPS63252681A (de)
KR (1) KR920001630B1 (de)
DE (1) DE3873585T2 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE9001409D0 (sv) * 1990-04-20 1990-04-20 Sandvik Ab Metod foer framstaellning av haardmetallkropp foer bergborrverktyg och slitdelar
GB9720059D0 (en) * 1997-09-19 1997-11-19 Isis Innovation Method of bonding

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5330352B2 (de) * 1971-12-14 1978-08-26
JPS56128688A (en) * 1980-03-11 1981-10-08 Kobe Steel Ltd Diffused junction method of materials of different kinds of metal
SE440753B (sv) * 1983-05-13 1985-08-19 Santrade Ltd Verktyg for skerande bearbetning bestaende av kerna och holje
JPS6071247A (ja) * 1983-09-28 1985-04-23 セイコーエプソン株式会社 時計用外装部品
JPS627802A (ja) * 1985-07-03 1987-01-14 Kubota Ltd 複合リング及びその製造方法

Also Published As

Publication number Publication date
EP0286948A2 (de) 1988-10-19
KR880012788A (ko) 1988-11-29
DE3873585T2 (de) 1992-12-10
EP0286948A3 (en) 1989-12-06
DE3873585D1 (de) 1992-09-17
KR920001630B1 (ko) 1992-02-21
JPH039832B2 (de) 1991-02-12
JPS63252681A (ja) 1988-10-19

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