EP0452541A2 - Procédé de fabrication d'objets creux en tantale - Google Patents

Procédé de fabrication d'objets creux en tantale Download PDF

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Publication number
EP0452541A2
EP0452541A2 EP90120379A EP90120379A EP0452541A2 EP 0452541 A2 EP0452541 A2 EP 0452541A2 EP 90120379 A EP90120379 A EP 90120379A EP 90120379 A EP90120379 A EP 90120379A EP 0452541 A2 EP0452541 A2 EP 0452541A2
Authority
EP
European Patent Office
Prior art keywords
tantalum
starting material
forming
hollow bodies
stamp
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.)
Ceased
Application number
EP90120379A
Other languages
German (de)
English (en)
Other versions
EP0452541A3 (en
Inventor
Michael Dr. Hörmann
David Francis Dr. Lupton
Otto Bach
Andreas Gräber
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 EP0452541A2 publication Critical patent/EP0452541A2/fr
Publication of EP0452541A3 publication Critical patent/EP0452541A3/de
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B21D22/205—Hydro-mechanical deep-drawing

Definitions

  • the invention relates to a process for the production of hollow bodies from tantalum by cold forming using a stamp.
  • a method of the type characterized above is e.g. from the magazine "Umformtechnik 15 (1981) 3, page 31 ff., It describes the cold forming, in particular the cold extrusion of tantalum.
  • the forming was carried out in four individual stages on a standing crank press. Sufficient results to prevent the tendency to weld von Tantal with the active parts of the press could only be achieved by combining several measures, including the use of materials other than chrome cold work steel for the active parts, their additional surface treatment, a surface treatment of the starting forms and their lubrication with a lubricant mixture.
  • DE-PS 38 04 567 discloses a process for optimizing the production of hollow bodies in the form of cups from highly ductile tantalum.
  • a lubricant film is applied to a tantalum sheet, which consists of an oxide layer of the metal, in which low molecular weight polytetrafluoroethylene is embedded, and then the tantalum sheet is cold-formed by means of a hard metal stamp in a single step to the hollow body by backward extrusion.
  • the object of the present invention is to provide a method in which tantalum with great ductility and a fine-grained structure is to be formed in one step into rotationally symmetrical hollow bodies by cold forming using a stamp.
  • the finished parts should have reproducible geometric properties and complex contours.
  • the microstructure in the finished part should remain in almost the same, fine-grained state as in the highly ductile semi-finished product.
  • This object is achieved in that a highly ductile tantalum sheet with a fine grain structure is used as the starting material, and in that a liquid under pressure is used to generate a counterpressure to the stamp.
  • the parts formed according to the invention have a homogeneous structure with quasi-isotropy, which manifests itself in uniform strength properties, in particular in an almost constant distribution of hardness in the circumferential direction.
  • Such uniform strength properties are of particular importance, for. B. for the high-speed forming of the rotationally symmetrical hollow body, as occurs, for example, in projectiles.
  • tantalum as the starting material, which has a grain size finer than No. 6 according to ASTM E 112, because cold forming can be carried out more easily.
  • an oxide layer as a lubricant layer for. B. anodic. This layer is very firmly bonded to the tantalum and causes such lubrication that the stamp does not weld to the tantalum sheet.
  • An oxide layer with a thickness of 200 nm can advantageously be applied, so that the frictional forces are kept almost constant during the pressing.
  • the figures show a deep-drawing tool for hydromechanical deep-drawing, which consists of a stamp 2 as a positive tool and a water box 3 with side walls 4.
  • the tantalum disk itself shows in the metal has a grain size of 6 according to ASTM E 112, and is further characterized by a tensile strength Rm of 245 N / mm, a yield strength R p 0.2 of 150 N / mm2, an elongation at break A125 of 70%, and a hardness of 78 Marked HV5. Furthermore, the metal has a greatly reduced texture and a fine grain size, and the structure of the starting material is in a homogeneous and recrystallized state. The tantalum disk is anodized on both sides to achieve good lubrication before use and therefore has an oxide layer 8 with a thickness of z. B. 200 nm.
  • a circularly symmetrical hollow body is produced from this blank 6 as a finished part 9 by hydromechanical deep drawing in one go.
  • the circular blank 6 is pressed directly against the immersing punch 2 (positive tool) with the aid of a pressure-controlled fluid cushion 1, as is indicated by the pressure arrows 10.
  • a maximum hydraulic pressure of P 250 bar is applied.
  • the liquid for the fluid cushion 1 is supplied via the inlet 13.
  • the finished, pressure-controlled, rotationally symmetrical hollow body 9 has an opening diameter 11 of 50 mm and an end height 12 of 30 mm. According to the invention, it has a recrystallized microstructure with fine grain, as was almost present in the starting material. This almost unchanged homogeneous and isotropic structure has been confirmed by micrographs.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
EP19900120379 1990-04-14 1990-10-24 Method of manufacturing hollow objects from tantalum Ceased EP0452541A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4012163 1990-04-14
DE19904012163 DE4012163A1 (de) 1990-04-14 1990-04-14 Verfahren zur herstellung von hohlkoerpern aus tantal

Publications (2)

Publication Number Publication Date
EP0452541A2 true EP0452541A2 (fr) 1991-10-23
EP0452541A3 EP0452541A3 (en) 1992-01-02

Family

ID=6404474

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900120379 Ceased EP0452541A3 (en) 1990-04-14 1990-10-24 Method of manufacturing hollow objects from tantalum

Country Status (2)

Country Link
EP (1) EP0452541A3 (fr)
DE (1) DE4012163A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997003772A1 (fr) * 1995-07-14 1997-02-06 The Whitaker Corporation Procede de formage pour matieres relativement dures
EP1447153A1 (fr) * 2003-02-12 2004-08-18 ThyssenKrupp Stahl AG Machine outil pour le formage des tôles à haute pression exterieure
CN102125952A (zh) * 2011-01-22 2011-07-20 安徽工业大学 锥壁斜凸缘类薄壁钣金件充液拉深成形方法
CN111408659A (zh) * 2020-04-01 2020-07-14 大连理工大学 中部不连续薄壁金属构件的叠层板成形方法
CN114273497A (zh) * 2022-01-28 2022-04-05 宁波江丰热等静压技术有限公司 一种钽包套的制备方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103551443B (zh) * 2013-10-30 2016-02-03 上海理工大学 充液拉深模具及其充液拉深方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1279615B (de) * 1961-07-07 1968-10-10 Siemens Elektrogeraete Gmbh Vorrichtung zum hydraulischen Tiefziehen
GB1142311A (en) * 1965-02-17 1969-02-05 Rheinmetall Gmbh Improvements in or relating to smoke cartridges and to methods and apparatus for producing containers for said cartridges
FR2429990B1 (fr) * 1978-06-27 1985-11-15 Saint Louis Inst Charge explosive plate
DE2855170A1 (de) * 1978-12-20 1980-06-26 Schmalbach Lubeca Verfahren zum hydrophilieren von metalloberflaechen und/oder metalloxidoberflaechen
DE3619791A1 (de) * 1986-06-18 1988-01-14 Rheinmetall Gmbh Wirkkoerper zum bekaempfen, insbesondere aktiv, gepanzerter ziele
FR2617189B1 (fr) * 1987-06-24 1989-10-20 Cegedur Toles en alliage d'aluminium contenant du magnesium aptes a la fabrication par emboutissage-etirage de corps de boites et procede d'obtention desdites toles

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997003772A1 (fr) * 1995-07-14 1997-02-06 The Whitaker Corporation Procede de formage pour matieres relativement dures
US5606888A (en) * 1995-07-14 1997-03-04 The Whitaker Corp. Method of forming relatively hard materials
CN1071604C (zh) * 1995-07-14 2001-09-26 惠特克公司 较硬材料的成形方法
EP1447153A1 (fr) * 2003-02-12 2004-08-18 ThyssenKrupp Stahl AG Machine outil pour le formage des tôles à haute pression exterieure
CN102125952A (zh) * 2011-01-22 2011-07-20 安徽工业大学 锥壁斜凸缘类薄壁钣金件充液拉深成形方法
CN102125952B (zh) * 2011-01-22 2013-06-26 安徽工业大学 锥壁斜凸缘类薄壁钣金件充液拉深成形方法
CN111408659A (zh) * 2020-04-01 2020-07-14 大连理工大学 中部不连续薄壁金属构件的叠层板成形方法
CN111408659B (zh) * 2020-04-01 2021-07-06 大连理工大学 中部不连续薄壁金属构件的叠层板成形方法
CN114273497A (zh) * 2022-01-28 2022-04-05 宁波江丰热等静压技术有限公司 一种钽包套的制备方法
CN114273497B (zh) * 2022-01-28 2023-07-25 宁波江丰热等静压技术有限公司 一种钽包套的制备方法

Also Published As

Publication number Publication date
EP0452541A3 (en) 1992-01-02
DE4012163A1 (de) 1991-10-17

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