US3600921A - Device for the explosive forming of workpieces - Google Patents

Device for the explosive forming of workpieces Download PDF

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Publication number
US3600921A
US3600921A US825895A US3600921DA US3600921A US 3600921 A US3600921 A US 3600921A US 825895 A US825895 A US 825895A US 3600921D A US3600921D A US 3600921DA US 3600921 A US3600921 A US 3600921A
Authority
US
United States
Prior art keywords
anvil
bottom plate
water
liquid
explosive
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
US825895A
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English (en)
Inventor
Ludwig Schwarz
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.)
Gebrueder Boehler and Co AG
Original Assignee
Gebrueder Boehler and Co AG
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 Gebrueder Boehler and Co AG filed Critical Gebrueder Boehler and Co AG
Application granted granted Critical
Publication of US3600921A publication Critical patent/US3600921A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/06—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure by shock waves
    • B21D26/08—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure by shock waves generated by explosives, e.g. chemical explosives

Definitions

  • a device for explosive forming of workpieces through a fluid comprising a vessel containing liquid (water), a bottom plate, and an anvil spaced from the bottom plate by biasing means (springs)
  • the workpiece is positioned on top of the anvil.
  • Guide means are provided which are operable with the anvil so that when the explosive-forming force strikes the anvil it moves linearly downwardly, and the liquid between the anvil and the bottom plate progressively damps the downward movement as it laterally escapes.
  • the guide means may be a series of pistons and cylinders, and preferably the explosive forming is done completely under water and a wall of bubbles is produced adjacent the anvil It is possible that the level of water is only equal to the level of the upwardly biased position of the anvil, in which case the explosive forming takes place in air, but the damping is still accomplished by water.
  • the present invention teaches a way to damp the shock waves occurring in the case of explosive forming without the aid of substances subject to wear and tear.
  • Water is used as a damping medium, whereby use is made of the physical phenomenon of the so-called progressive damping.
  • the latter phenomenon rests on the inertia of a layer of water, compressed between two parallel surfaces, with a possibility for lateral escape of the compressed medium.
  • progressive resistance In this case it turned out that the resistance against a further relative approach of two parallel plates will become greater, the greater their approach is which has already taken place, i.e. progressive resistance.
  • this phenomenon expresses itself in the fact that, for example, a resiliently supported anvil, between which anvil and a bottom plate there is a water cushion with a possibility for lateral escape, will first be quickly pressed downwards through the explosive pressure.
  • the resistance against further downward movement increases progressively, whereby the portion of spent kinetic energy grows progressively so that the anvil will either not strike against the bottom plate at all, or strike with only a small force.
  • the damping effect will be greater, the greater the surface area of the pressure-producing surfaces.
  • the damping effect will decrease the more the opposing surfaces of the anvil and bottom plate deviate from parallelism, therefore, it is required that they be substantially parallel.
  • the sidewalls of the water vessel should have a small angle of inclination with relation to the bottom plate.
  • the accompanying drawing shows an exemplary embodiment of the invention as used, for example, for the expansion of a metallic hollow cylinder.
  • the hollow cylinder 1 that is to be expanded rests on the anvil 2, which is supported in such a way that it can move only in the direction perpendicular to the bottom plate 4.
  • the linear guidance of the anvil is essential, since ifit tilts and goes out of parallel with the bottom plate the damping effect will be strongly reduced.
  • Reference numeral 3 designates the cylindrical bores in the bottom plate 4
  • reference numeral 5 designates the pistons attached at the lower side of the anvil, which slide in the cylinders 3 in order to guarantee a linear guidance of the anvil.
  • the anvil rests on the springs 6 which, however, do not necessarily have to encompass the pistons, as happens to be the case in the preferred embodiment. In order to hold the anvil at a distance from the base plate prior to the spring in the middle, or through a series of springs along the periphery.
  • a lateral, closed limiting surface on the surface of the bottom plate facing the anvil, assuring at the same time the ability to lower the anvil and provide for the lateral escape of the water.
  • the axis of symmetry of the limiting surface would preferably coincide with the axis of symmetry of the casing of the anvil.
  • the anvil is circular, it will thus submerge into a water-filled hollow cylinder connected with the bottom plate, the inside diameter of which is larger than the diameter of the anvil.
  • the laterally escaping water is forced into a change of direction upwards along the wall of the limiting surface, which leads to an intensification of the damping effect.
  • polygonal shapes can be used.
  • a device for the explosive forming of workpieces through a fluid medium comprising a vessel containing liquid and having a bottom plate; an anvil spaced from said bottom plate by biasing means and adapted to hold a workpiece, said space being completely filled with liquid; and guide means operable with said anvil so that when the explosive-forming force strikes said anvil it moves linearly downwardly, which movement is substantially solely progressively damped by said liquid laterally escaping from between said anvil and said bottom plate.
  • a device as claimed in claim I wherein the explosion occurs completely under water; means are provided to form a wall of bubbles in said water adjacent said anvil; and the lateral walls of said vessel form an obtuse angle with said bottom plate.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Press Drives And Press Lines (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
US825895A 1968-05-17 1969-05-19 Device for the explosive forming of workpieces Expired - Lifetime US3600921A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT474168A AT299664B (de) 1968-05-17 1968-05-17 Vorrichtung zur Explosionverformung metallischer Werkstoffe

Publications (1)

Publication Number Publication Date
US3600921A true US3600921A (en) 1971-08-24

Family

ID=3567775

Family Applications (1)

Application Number Title Priority Date Filing Date
US825895A Expired - Lifetime US3600921A (en) 1968-05-17 1969-05-19 Device for the explosive forming of workpieces

Country Status (7)

Country Link
US (1) US3600921A (de)
AT (1) AT299664B (de)
BE (1) BE733087A (de)
CH (1) CH504911A (de)
DE (1) DE1924064A1 (de)
FR (1) FR2008749A1 (de)
GB (1) GB1202508A (de)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6176970B1 (en) * 1999-03-23 2001-01-23 Dynawave Corporation Device and method of using explosive forces in a contained liquid environment
US6613105B1 (en) 1998-09-03 2003-09-02 Micron Technology, Inc. System for filling openings in semiconductor products
US20040134254A1 (en) * 2001-05-10 2004-07-15 Anders Dahlberg Method employing high kinetic energy for working of material
US20050167059A1 (en) * 1999-03-23 2005-08-04 Staton Vernon E. Device and method of using explosive forces in a contained environment
US20090013744A1 (en) * 2005-06-03 2009-01-15 Cosma Engineering Eueope Ag Device and Method for Explosion Forming
US20100011827A1 (en) * 2006-12-20 2010-01-21 Philipp Stoeger Workpiece and method for explosion forming
US20100064752A1 (en) * 2006-12-01 2010-03-18 Alexander Zak Closure device for explosion forming
US20100175448A1 (en) * 2006-08-11 2010-07-15 Andreas Stranz Method and device for explosion forming
US20100207287A1 (en) * 2006-08-11 2010-08-19 Alexander Zak Method and device for explosion forming
US20110180735A1 (en) * 2007-08-02 2011-07-28 Andreas Stranz Device for supplying a fluid for explosion forming
US8713982B2 (en) 2008-01-31 2014-05-06 Magna International Inc. Device for explosive forming
US8875553B2 (en) 2007-02-14 2014-11-04 Cosma Engineering Europe Ag Method and mould arrangement for explosion forming
US9393606B2 (en) 2007-05-22 2016-07-19 Cosma Engineering Europe Ag Ignition device for explosive forming
US9737922B2 (en) 2007-02-14 2017-08-22 Magna International Inc. Explosion forming system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3181327A (en) * 1961-04-10 1965-05-04 Aerojet General Co Explosive edge-forming
US3214950A (en) * 1963-01-11 1965-11-02 Mak Maschinenbau Kiel Gmbh Apparatus for the deformation of metal sheets and preshaped bodies under shock effect in water
US3343389A (en) * 1965-02-01 1967-09-26 Lockheed Aircraft Corp High energy rate forming apparatus and method
US3464249A (en) * 1965-11-30 1969-09-02 Beteiligungs & Patentverw Gmbh Method of and apparatus for explosive treatment of metals

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3181327A (en) * 1961-04-10 1965-05-04 Aerojet General Co Explosive edge-forming
US3214950A (en) * 1963-01-11 1965-11-02 Mak Maschinenbau Kiel Gmbh Apparatus for the deformation of metal sheets and preshaped bodies under shock effect in water
US3343389A (en) * 1965-02-01 1967-09-26 Lockheed Aircraft Corp High energy rate forming apparatus and method
US3464249A (en) * 1965-11-30 1969-09-02 Beteiligungs & Patentverw Gmbh Method of and apparatus for explosive treatment of metals

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6613105B1 (en) 1998-09-03 2003-09-02 Micron Technology, Inc. System for filling openings in semiconductor products
US6642140B1 (en) 1998-09-03 2003-11-04 Micron Technology, Inc. System for filling openings in semiconductor products
US20030211658A1 (en) * 1998-09-03 2003-11-13 Moore Scott E. System for filling openings in semiconductor products
US20050048751A1 (en) * 1998-09-03 2005-03-03 Moore Scott E. System and method for filling openings in semiconductor products
US7060608B2 (en) 1998-09-03 2006-06-13 Micron Technology, Inc. System and method for filling openings in semiconductor products
US7070659B2 (en) 1998-09-03 2006-07-04 Micron Technology, Inc. System for filling openings in semiconductor products
US20060148240A1 (en) * 1998-09-03 2006-07-06 Moore Scott E System and method for filling openings in semiconductor products
US7510625B2 (en) 1999-03-23 2009-03-31 Dynawave Corporation Device and method of using explosive forces in a contained environment
US6176970B1 (en) * 1999-03-23 2001-01-23 Dynawave Corporation Device and method of using explosive forces in a contained liquid environment
US6837971B1 (en) 1999-03-23 2005-01-04 Dynawave Corporation Device and method of using explosive forces in a contained liquid environment
US20050167059A1 (en) * 1999-03-23 2005-08-04 Staton Vernon E. Device and method of using explosive forces in a contained environment
US20040134254A1 (en) * 2001-05-10 2004-07-15 Anders Dahlberg Method employing high kinetic energy for working of material
US7104190B2 (en) * 2001-05-10 2006-09-12 Morphic Technologies Aktiebolag (Publ) Method employing high kinetic energy for working of material
US20090013744A1 (en) * 2005-06-03 2009-01-15 Cosma Engineering Eueope Ag Device and Method for Explosion Forming
US8047036B2 (en) 2005-06-03 2011-11-01 Magna International Inc. Device and method for explosion forming
US8650921B2 (en) 2006-08-11 2014-02-18 Cosma Engineering Europe Ag Method and device for explosion forming
US20100175448A1 (en) * 2006-08-11 2010-07-15 Andreas Stranz Method and device for explosion forming
US20100207287A1 (en) * 2006-08-11 2010-08-19 Alexander Zak Method and device for explosion forming
US8252210B2 (en) 2006-08-11 2012-08-28 Cosma Engineering Europe Ag Method and device for explosion forming
US8250892B2 (en) 2006-12-01 2012-08-28 Cosma Engineering Europe Ag Closure device for explosion forming
US20100064752A1 (en) * 2006-12-01 2010-03-18 Alexander Zak Closure device for explosion forming
US8322175B2 (en) 2006-12-20 2012-12-04 Cosma Engineering Europe Ag Workpiece and method for explosion forming
US20100011827A1 (en) * 2006-12-20 2010-01-21 Philipp Stoeger Workpiece and method for explosion forming
US8875553B2 (en) 2007-02-14 2014-11-04 Cosma Engineering Europe Ag Method and mould arrangement for explosion forming
US9737922B2 (en) 2007-02-14 2017-08-22 Magna International Inc. Explosion forming system
US9393606B2 (en) 2007-05-22 2016-07-19 Cosma Engineering Europe Ag Ignition device for explosive forming
US20110180735A1 (en) * 2007-08-02 2011-07-28 Andreas Stranz Device for supplying a fluid for explosion forming
US8939743B2 (en) 2007-08-02 2015-01-27 Cosma Engineering Europe Ag Device for supplying a fluid for explosion forming
US8713982B2 (en) 2008-01-31 2014-05-06 Magna International Inc. Device for explosive forming

Also Published As

Publication number Publication date
GB1202508A (en) 1970-08-19
DE1924064A1 (de) 1969-12-11
AT299664B (de) 1972-06-26
CH504911A (de) 1971-03-31
FR2008749A1 (de) 1970-01-23
BE733087A (de) 1969-10-16

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