EP1574593B1 - Déformation à froid de molybdène par extrusion indirecte - Google Patents

Déformation à froid de molybdène par extrusion indirecte Download PDF

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Publication number
EP1574593B1
EP1574593B1 EP04021093A EP04021093A EP1574593B1 EP 1574593 B1 EP1574593 B1 EP 1574593B1 EP 04021093 A EP04021093 A EP 04021093A EP 04021093 A EP04021093 A EP 04021093A EP 1574593 B1 EP1574593 B1 EP 1574593B1
Authority
EP
European Patent Office
Prior art keywords
molybdenum
cold
carried out
workpiece
inert gas
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
EP04021093A
Other languages
German (de)
English (en)
Other versions
EP1574593A1 (fr
Inventor
Bernd Spaniol
Wolfgang Günther
Josef Trageser
Jörg Schielke
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.)
WC Heraus GmbH and Co KG
Original Assignee
WC Heraus GmbH and Co KG
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 WC Heraus GmbH and Co KG filed Critical WC Heraus GmbH and Co KG
Publication of EP1574593A1 publication Critical patent/EP1574593A1/fr
Application granted granted Critical
Publication of EP1574593B1 publication Critical patent/EP1574593B1/fr
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
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
    • C22F1/18—High-melting or refractory metals or alloys based thereon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/002—Extruding materials of special alloys so far as the composition of the alloy requires or permits special extruding methods of sequences
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/02—Making uncoated products
    • B21C23/18—Making uncoated products by impact extrusion
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/02—Manufacture of electrodes or electrode systems
    • H01J9/022—Manufacture of electrodes or electrode systems of cold cathodes

Definitions

  • the present invention relates to the cold working of molybdenum by reverse extrusion.
  • Molybdenum is used in lighting because of its thermal, electrical and chemical properties. It is a brittle material at room temperature, and precursors and semi-finished products are usually hot-formed. Molybdenum molded parts such as tubes or caps for the lighting technology can be made by deep drawing 1 of sheets and strips at room temperature.
  • Deep drawing refers to the tensile pressure forming of sheets into a hollow body or the formation of a hollow body with a smaller circumference from a hollow body of larger circumference. The sheet thickness is not deliberately changed.
  • the cut sheet is placed in the receptacle. A hold-down presses the sheet on the drawing die and prevents wrinkling during deep drawing. The dropping punch pushes the sheet into the drawing die and thus shapes it to the desired workpiece.
  • the draw ratio is the ratio of the diameter of the cut sheet to the diameter of the workpiece. Between the deep drawing steps, an intermediate annealing can take place.
  • the compact starting material is either pressed with a punch through a die ( forward ) similar to the extruding or the punch is pressed into the starting material and the material flows backwards along the punch.
  • the differences from extrusion are in the processing temperature and in that by extruding no semi-finished product strands, but individual parts are produced, which are also complex shapes to produce.
  • Advantages of the method are low tool costs, high tool life and a high operating speed with cycle numbers of about 30-150 pieces / min.
  • the surface quality is good and suitable for further surface treatments.
  • the main field of application is aluminum alloys.
  • Fig. 1 shows the longitudinal section of a molybdenum coping produced by the process according to the invention in the scale 50: 1.
  • Such caps can be used as emitter electrodes in CCFL lamps.
  • the material used is converted to 100% waste-free.
  • the microscopic longitudinal section through a cap produced by this method in Fig. 1 shows that crack-free rotationally symmetrical molded parts can be produced in this way.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Thermal Sciences (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Forging (AREA)
  • Extrusion Of Metal (AREA)
  • Inorganic Compounds Of Heavy Metals (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Discharge Lamp (AREA)

Claims (6)

  1. Procédé de déformation à froid du molybdène par extrusion indirecte, caractérisé en ce qu'une recristallisation complète est effectuée avant la déformation à froid.
  2. Procédé selon la revendication 1, caractérisé en ce que la recristallisation est effectuée sous gaz protecteur et/ou vide.
  3. Procédé selon l'une des revendications précédentes, caractérisé en ce que la recristallisation est effectuée à des températures supérieures à 1300°C.
  4. Procédé selon au moins l'une des revendications précédentes, caractérisé en ce que
    A) une pièce en molybdène est complètement recristallisée sous vide et/ou sous gaz protecteur à des températures supérieures à 1400°C,
    B) la pièce est refroidie sous vide et/ou gaz protecteur,
    C) des tronçons de la pièce ainsi recristallisée sont extrudés en éléments préfabriqués à température ambiante.
  5. Procédé selon la revendication 4, dans lequel les éléments préfabriqués sont pressés de façon symétrique en rotation.
  6. Procédé selon la revendication 4 ou 5, dans lequel les éléments préfabriqués sont des traversées de courant à travers des flacons de verre ou de céramique ou des électrodes d'émetteurs dans des lampes CCFL ou des lampes à cathode froide.
EP04021093A 2003-10-02 2004-09-04 Déformation à froid de molybdène par extrusion indirecte Expired - Lifetime EP1574593B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10346464 2003-10-02
DE10346464A DE10346464B4 (de) 2003-10-02 2003-10-02 Verfahren zur Kaltumformung von Molybdän durch Rückwärts-Fließpressen und Verwendung von rückwärts-fließgepressten Molybdän-Formteilen

Publications (2)

Publication Number Publication Date
EP1574593A1 EP1574593A1 (fr) 2005-09-14
EP1574593B1 true EP1574593B1 (fr) 2008-10-29

Family

ID=34399318

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04021093A Expired - Lifetime EP1574593B1 (fr) 2003-10-02 2004-09-04 Déformation à froid de molybdène par extrusion indirecte

Country Status (7)

Country Link
EP (1) EP1574593B1 (fr)
JP (1) JP4348266B2 (fr)
KR (1) KR100771731B1 (fr)
CN (1) CN100335671C (fr)
AT (1) ATE412786T1 (fr)
DE (2) DE10346464B4 (fr)
TW (1) TWI283609B (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113732219B (zh) * 2021-08-12 2023-10-13 宁波复能稀土新材料股份有限公司 一种稀土铽靶材真空热挤压成型装置

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3553996A (en) * 1967-11-13 1971-01-12 Battelle Development Corp Extrusion of brittle materials
US4462234A (en) * 1980-06-19 1984-07-31 Battelle Development Corporation Rapid extrusion of hot-short-sensitive alloys
JPS5731408A (en) * 1980-06-19 1982-02-19 Battelle Development Corp Double extruding die and its extruding method
JPS6075545A (ja) * 1983-09-29 1985-04-27 Toshiba Corp ダイス及びその製造方法
JPS6082648A (ja) * 1983-10-08 1985-05-10 Agency Of Ind Science & Technol 高強度・難加工材の成形法
AT392432B (de) * 1989-05-03 1991-03-25 Plansee Metallwerk Verfahren zur herstellung von warmkriechfesten halbfabrikaten oder formteilen aus hochschmelzenden metallen
US5158709A (en) * 1990-02-01 1992-10-27 Patent Treuhand Gesellschaft Fur Elektrische Gluhlampen Mbh Electric lamp containing molybdenum material doped wtih aluminum and potassium, molybdenum material for such a lamp, and method of its manufacture
EP0694084B1 (fr) * 1993-04-15 2001-09-19 Luxfer Group Limited Procede de fabrication de corps creux
JP3079378B1 (ja) * 1999-02-10 2000-08-21 東京タングステン株式会社 Ｍｏスパッターリングターゲット材及びその製造方法

Also Published As

Publication number Publication date
DE10346464B4 (de) 2006-04-27
KR100771731B1 (ko) 2007-10-30
EP1574593A1 (fr) 2005-09-14
CN100335671C (zh) 2007-09-05
TWI283609B (en) 2007-07-11
CN1611629A (zh) 2005-05-04
DE10346464A1 (de) 2005-05-04
DE502004008340D1 (de) 2008-12-11
JP4348266B2 (ja) 2009-10-21
KR20050033001A (ko) 2005-04-08
ATE412786T1 (de) 2008-11-15
TW200526336A (en) 2005-08-16
JP2005111562A (ja) 2005-04-28

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