EP1154026A1 - Verfahren zur Herstellung von Zinn-Wolfram-Verbundschrott mit geringer Dicke - Google Patents

Verfahren zur Herstellung von Zinn-Wolfram-Verbundschrott mit geringer Dicke Download PDF

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Publication number
EP1154026A1
EP1154026A1 EP01401106A EP01401106A EP1154026A1 EP 1154026 A1 EP1154026 A1 EP 1154026A1 EP 01401106 A EP01401106 A EP 01401106A EP 01401106 A EP01401106 A EP 01401106A EP 1154026 A1 EP1154026 A1 EP 1154026A1
Authority
EP
European Patent Office
Prior art keywords
tin
tungsten
wire
mixture
spinning
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
EP01401106A
Other languages
English (en)
French (fr)
Other versions
EP1154026B1 (de
Inventor
Alain Le Floc'h
Jean-Michael Tauzia
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.)
Safran Ceramics SA
Original Assignee
Societe Nationale des Poudres et Explosifs
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 Societe Nationale des Poudres et Explosifs filed Critical Societe Nationale des Poudres et Explosifs
Publication of EP1154026A1 publication Critical patent/EP1154026A1/de
Application granted granted Critical
Publication of EP1154026B1 publication Critical patent/EP1154026B1/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
    • C22C1/00—Making non-ferrous alloys
    • C22C1/04—Making non-ferrous alloys by powder metallurgy
    • C22C1/045—Alloys based on refractory metals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B12/00—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material
    • F42B12/72—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the material
    • F42B12/74—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the material of the core or solid body
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B7/00—Shotgun ammunition
    • F42B7/02—Cartridges, i.e. cases with propellant charge and missile
    • F42B7/04—Cartridges, i.e. cases with propellant charge and missile of pellet type
    • F42B7/046—Pellets or shot therefor
    • 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
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • B22F2998/10—Processes characterised by the sequence of their steps

Definitions

  • the present invention is essentially located in hunting and fishing and more specifically for a new manufacturing process low-tin-tungsten composite elements thickness, especially the manufacture of shot spherical for hunting cartridges or for lead shot peach.
  • U.S. Patent 5,877,437 describes spherical tin-tungsten composite shot for hunting cartridges, in the form of a malleable tin matrix containing, so evenly distributed, like tungsten powder charge.
  • the shot can be obtained by dispersing the tungsten powder in molten tin, then formation of drops through calibrated openings at the top of a tower. We provoke then the drop of these drops in air or water, this which allows, by cooling, the shot spherical.
  • the shot can be obtained by molding the dispersion of the powder tungsten in molten tin, but such a process is very expensive to obtain shot and is more suitable for obtaining projectiles or larger objects bulky.
  • one compacts at high pressing in a mold a mixture of tin powders and tungsten at a temperature below the point of tin fusion.
  • US Patent 5,399,187 further describes obtaining composite balls which can be consisting of a tin matrix loaded with powdered tungsten.
  • balls can be obtained by mixing powders metal, followed by compacting in bars or billets which are then extruded into wires. The balls are then obtained by forging wires using punches.
  • the present invention relates to such a method.
  • the wire obtained can be cut into sections which are then stamped to the desired shape, using machines well known to those skilled in the art for exercising such a function.
  • the mixture of tin powder and tungsten powder is directly extruded, to solid state, in a wire whose thickness is included between 1 mm and 6 mm, preferably between 2 mm and 4 mm, limits included, especially when the section of the wire is circular, which is also preferred.
  • the section of the wire can however be arbitrary, especially elliptical, square, triangular, rectangular, polygonal.
  • solid state it should be understood that the mixture of tin and tungsten powders is extruded to a temperature below the melting point of tin.
  • the mixture is extruded at a temperature between 170 ° C and 225 ° C, better yet between 190 ° C and 220 ° C, limits included.
  • the particle size of the powders preferably being in the range 1 ⁇ m -200 ⁇ m , better still in the range 10 ⁇ m -50 ⁇ m .
  • the tin / tungsten weight ratio is preferably between 0.5 and 2.0, better still between 0.7 and 1.5. We thus obtain composite elements, especially shot, having a density approximately between 9 and 12.5.
  • the extrusion of the powder mixture can then be driving either continuously by feeding regularly an extruder adapted to this type which is preferred, so discontinuous.
  • the size of the nozzle or nozzles corresponds to the desired section for the wire.
  • the mixture of tin powders and tungsten is subjected to a partial vacuum before being extruded.
  • a reduced pressure is imposed in the extrusion container containing the mixture, preferably less than 100 mm Hg, using pumping suitable and well known to those skilled in the art.
  • the spinning speed measured at the nozzle, or nozzles, outlet the die, must be ⁇ 80 mm / s.
  • the spinning speed is between 1 mm / s and 80 mm / s, better still between 5 mm / s and 60 mm / s.
  • the spinning speed corresponds a limitation of the energy supply during spinning.
  • the spinning power developed by the press piston is less than 150 W, by example between 10 W and 100 W, better still between 10 W and 70 W, by extrusion nozzle.
  • the spinning pressure is between 100 MPa and 300 MPa.
  • the speed of the press piston is generally less than 0.6 mm / s, preferably between 0.05 mm / s and 0.5 mm / s.
  • the sector does not have a convergent (flat sector) and its range (thickness corresponding to the length of the nozzle hole) is preferably between 5 mm and 15 mm.
  • the wire is cut obtained in sections, more particularly in cylinders preferably having a length equal to the diameter of the wire, or close to it, then these elements are then stamped, preferably at temperature ambient, to obtain the desired shape.
  • this stamping allows to obtain spheres, or pseudo-spheres which are then rectified to the state of spheres, whose diameter is very close to or identical to that of the wire.
  • Such spherical elements are particularly suitable for making hunting cartridges or Lead sinker sinkers for fixed, deep-sea fishing fly or whip, especially split pellets.
  • Such ovoid elements are particularly suitable for use as ballasting olives for trolling or casting, especially split olives.
  • the thickness of the elements obtained is generally identical or very close to that of the wire.
  • composite elements having a thickness can vary from approximately 1 mm to approximately 6 mm.
  • the present invention also relates to the aforementioned process for obtaining the wire, namely a process for obtaining a tin-tungsten composite wire from a mixture of tin and tungsten powders characterized in that the powder mixture is directly extruded, in the solid state, into a wire of which the thickness is between 1 mm and 6 mm and in that the spinning speed is less than or equal to 80 mm / s.
  • Low-tin-tungsten composite elements aforementioned thickness can be used for other purposes that the production of hunting cartridges or pellets fishing, in particular and for example to carry out balancing weights or shielding objects ionizing radiation.
  • Such screens and weights can also be obtained from the wire itself, without it being previously cut.
  • Examples 1 to 6 production of spherical tin-tungsten composite shot according to the invention, of various densities and particle sizes
  • the tungsten powder and the tin powder used have a median diameter of approximately 30 ⁇ m .
  • Tin and tungsten powders are mixed in the proportions mentioned later for each example using an appropriate type mixer Forberg, at room temperature (around 20 ° C), for about 10 min, so as to obtain a mixture homogeneous.
  • the homogeneous mixture of the 2 powders is then poured in the container of an extrusion press.
  • the container cylindrical in shape, has a piston internal diameter equal to the internal diameter of the container, to the nearest tolerance, so that ability to push the mixture towards the die.
  • the piston displacement stroke (useful length container) is 70 mm.
  • the container is provided on the one hand with a device (heating jacket) for heating of the powder mixture it contains, and on the other hand a vacuum connection associated with a frit allowing establish reduced pressure in the filled container of the powder mixture before extrusion.
  • a device heating jacket
  • a vacuum connection associated with a frit
  • the extrusion press also has a cylindrical flat die (without convergent) having a reach (thickness) of 10 mm and fitted with a single hole cylindrical centrally located with a diameter 2.6 mm or 3.2 mm is specified for each example.
  • the drilling of the die is initially blocked by an aluminum seal so that you can make a partial vacuum in the container.
  • the container is then heated and evacuated partial up to reduced pressure less than 80 mm Hg.
  • Example 1 9.43
  • Example 2 9.69
  • Example 3 9.84 Examples 4 to 6 not measured.
  • Densities measured are close to the density theoretical. Densification is ⁇ 95%.
  • Example 1 80 °
  • Example 2 60 °
  • Example 3 60 ° Examples 4 to 6 not measured.
  • Example 1 13.52 (long) and 13.03 (cross)
  • Example 2 15.07 (long) and 14.27 (cross)
  • Example 3 14.87 (long) and 15.23 (cross) Examples 4 to 6 not measured.
  • wires obtained for these 6 examples then have been cut into cylinders whose length is equal to wire diameter using a well known machine of the skilled person to exercise this operation.
  • the cylinders were then stamped, at the room temperature (around 20 ° C), in spheres with a diameter approximately identical to that of cylinders and wire, also using a machine well known to those skilled in the art to exercise this operation, particularly in the field of rolling bearings marbles.
  • the spinning power is 181 W.
  • the expected spinning speed is 156 mm / s, but we found that the wire comes out in pieces, which is undesirable.
  • the expected spinning speed is 1560 mm / s, but only molten particles appear.
EP01401106A 2000-05-10 2001-04-27 Verfahren zur Herstellung von Zinn-Wolfram-Verbundschrott mit geringer Dicke Expired - Lifetime EP1154026B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0005930 2000-05-10
FR0005930A FR2808711B1 (fr) 2000-05-10 2000-05-10 Procede de fabrication d'elements composites etain-tungstene de faible epaisseur

Publications (2)

Publication Number Publication Date
EP1154026A1 true EP1154026A1 (de) 2001-11-14
EP1154026B1 EP1154026B1 (de) 2006-04-26

Family

ID=8850053

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01401106A Expired - Lifetime EP1154026B1 (de) 2000-05-10 2001-04-27 Verfahren zur Herstellung von Zinn-Wolfram-Verbundschrott mit geringer Dicke

Country Status (9)

Country Link
US (1) US6569381B2 (de)
EP (1) EP1154026B1 (de)
AT (1) ATE324469T1 (de)
CA (1) CA2347047C (de)
DE (1) DE60119021T2 (de)
DK (1) DK1154026T3 (de)
ES (1) ES2262615T3 (de)
FR (1) FR2808711B1 (de)
PT (1) PT1154026E (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7837809B2 (en) 2004-08-10 2010-11-23 Real Federacion Espanola De Caza Materials for the production of ecological ammunition and other applications

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6671997B2 (en) * 2002-06-11 2004-01-06 Peter B. Lindgren Heavy monofilament fishing line
US6981996B2 (en) * 2003-03-14 2006-01-03 Osram Sylvania Inc. Tungsten-tin composite material for green ammunition
US7803314B1 (en) * 2003-12-18 2010-09-28 Daniel George Tercho Non-toxic shot formulation and method of making
US20050188890A1 (en) * 2004-02-26 2005-09-01 Alltrista Zinc Products, L.P. Composition and method for making frangible bullet
DE102005045046A1 (de) * 2005-09-21 2007-03-22 Basf Ag Wolfram-Schrot
US20100276829A1 (en) * 2006-02-13 2010-11-04 Guohua Yang High Aspect Ratio Microstructures and Method for Fabricating High Aspect Ratio Microstructures From Powder Composites
WO2008034891A2 (en) * 2006-09-21 2008-03-27 Probiodrug Ag Novel genes related to glutaminyl cyclase
US8889709B2 (en) * 2006-09-21 2014-11-18 Probiodrug Ag Use of isoQC inhibitors in the treatment and prevention of inflammatory diseases or conditions
US20090042057A1 (en) * 2007-08-10 2009-02-12 Springfield Munitions Company, Llc Metal composite article and method of manufacturing
US8365672B2 (en) * 2009-03-25 2013-02-05 Aleaciones De Metales Sinterizados, S.A. Frangible bullet and its manufacturing method

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5950064A (en) * 1997-01-17 1999-09-07 Olin Corporation Lead-free shot formed by liquid phase bonding

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5877437A (en) 1992-04-29 1999-03-02 Oltrogge; Victor C. High density projectile
US5913256A (en) * 1993-07-06 1999-06-15 Lockheed Martin Energy Systems, Inc. Non-lead environmentally safe projectiles and explosive container
US5399187A (en) 1993-09-23 1995-03-21 Olin Corporation Lead-free bullett
CA2194487C (en) * 1994-07-06 2000-06-06 Richard A. Lowden Non-lead, environmentally safe projectiles and method of making same
US6248150B1 (en) * 1999-07-20 2001-06-19 Darryl Dean Amick Method for manufacturing tungsten-based materials and articles by mechanical alloying

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5950064A (en) * 1997-01-17 1999-09-07 Olin Corporation Lead-free shot formed by liquid phase bonding

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7837809B2 (en) 2004-08-10 2010-11-23 Real Federacion Espanola De Caza Materials for the production of ecological ammunition and other applications

Also Published As

Publication number Publication date
EP1154026B1 (de) 2006-04-26
CA2347047C (fr) 2007-09-18
CA2347047A1 (fr) 2001-11-10
ES2262615T3 (es) 2006-12-01
US6569381B2 (en) 2003-05-27
FR2808711A1 (fr) 2001-11-16
DK1154026T3 (da) 2006-08-28
ATE324469T1 (de) 2006-05-15
US20010053331A1 (en) 2001-12-20
DE60119021D1 (de) 2006-06-01
FR2808711B1 (fr) 2002-08-09
PT1154026E (pt) 2006-08-31
DE60119021T2 (de) 2006-11-02

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