EP0261376A2 - Dispositif d'accélération de grenaille magnétique - Google Patents

Dispositif d'accélération de grenaille magnétique Download PDF

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Publication number
EP0261376A2
EP0261376A2 EP87111743A EP87111743A EP0261376A2 EP 0261376 A2 EP0261376 A2 EP 0261376A2 EP 87111743 A EP87111743 A EP 87111743A EP 87111743 A EP87111743 A EP 87111743A EP 0261376 A2 EP0261376 A2 EP 0261376A2
Authority
EP
European Patent Office
Prior art keywords
coil
accelerator
blasting
concentrator
core
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
EP87111743A
Other languages
German (de)
English (en)
Other versions
EP0261376B1 (fr
EP0261376A3 (en
Inventor
Gerd Prof. Dr.-Ing. Stange
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.)
ALFRED GUTMANN GESELLSCHAFT FUER MASCHINENBAU MBH
Original Assignee
Alfred Gutmann Gesellschaft fur Maschinenbau Mbh
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 Alfred Gutmann Gesellschaft fur Maschinenbau Mbh filed Critical Alfred Gutmann Gesellschaft fur Maschinenbau Mbh
Publication of EP0261376A2 publication Critical patent/EP0261376A2/fr
Publication of EP0261376A3 publication Critical patent/EP0261376A3/de
Application granted granted Critical
Publication of EP0261376B1 publication Critical patent/EP0261376B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41B—WEAPONS FOR PROJECTING MISSILES WITHOUT USE OF EXPLOSIVE OR COMBUSTIBLE PROPELLANT CHARGE; WEAPONS NOT OTHERWISE PROVIDED FOR
    • F41B6/00—Electromagnetic launchers ; Plasma-actuated launchers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C5/00—Devices or accessories for generating abrasive blasts
    • B24C5/08—Devices for generating abrasive blasts non-mechanically, e.g. of metallic abrasives by means of a magnetic field or by detonating cords

Definitions

  • the invention relates to a device for accelerating a blasting medium consisting of magnetically influenceable, in particular iron particles, for treating workpiece surfaces with one or more electromagnetic accelerator coils arranged along the path of the blasting medium, which are excited or de-energized depending on the moving blasting medium .
  • the invention is based on the object of creating a device of the type mentioned at the outset, that is to say to create a device in which the abrasive is accelerated with the aid of the magnetic force generated in an accelerator coil and, in doing so, with a lower energy requirement compared to conventional ones Acceleration types with equivalent performance (throughput of abrasive per unit time).
  • Flow concentrators of this type have hitherto been used in completely different fields, in particular in basic research. These flux concentrators have a core made of electrically highly conductive material, e.g. made of copper, in which there is a usable field bore and a radial slot. If a winding which is located on the outside of the core is now flowed through by a pulsed current, then a current is induced in the opposite direction into the electrically well-conducting core according to the transformer principle and flows as a pulse current only on the surface of the core. At the location of the radial slot, the current flow is forced inwards around the useful field bore.
  • electrically highly conductive material e.g. made of copper
  • abrasive device which is basically constructed in the same way as conventional abrasive devices. It consists of an electromagnetic acceleration unit 1, the heart of which is a flux concentrator. A movable blasting hose 3 is arranged in the blasting agent cabin 2, by means of which an operator can direct the accelerated blasting agent onto a workpiece 4. The blasting agent return and feed is designated 5.
  • the acceleration unit shown in Fig. 2 consists of a flux concentrator 6 as an accelerator coil.
  • the blasting agent 9 is fed via a feed device 8.
  • a metering coil 7 serves as a “pre-bundler” through which the abrasive is distributed in the desired amount to the flux concentrator 6.
  • the blasting agent outlet is designated by 10.
  • the blasting hose 3 which can be seen in FIG. 1 is placed on this outlet.
  • the essentially rotationally symmetrical flow concentrator shown in FIG. 4 practically as a section perpendicular to the axis of the movement of the abrasive has a core 11 constructed from a material which is a good electrical conductor (e.g. copper) and in which there is a cylindrical useful field bore 12 and a radial slot 13.
  • the excitation winding which can consist of several turns, is designated 14.
  • FIG. 5 and 6 another advantageous embodiment is shown.
  • two excitation windings 14 and 15 are nested concentrically with corresponding concentrator cores.
  • the inner part corresponds to that according to FIG. 4 and is designated with corresponding reference numerals.
  • a concentrator shell 18 is placed on this inner part acts as an additional core for the outer field winding 15. The two arrangements add up in their effect.
  • the concentrator shell 18 is connected to the inner core 11 at 19.
  • Fig. 7 shows the circuit diagram of a pulse generator working with thyristors T1, T2, with which a system constructed according to FIGS. 5 and 6 has been tested.
  • the voltage source with the voltage UO loads the capacitor C L , which is periodically discharged via the thyristors T 1, T 2 acting in parallel as controllable switches into the load inductance L L of the flux concentrator (inductance of the excitation coils) and, due to the resulting pulsed current flow, the desired useful field there with induction B.
  • FIG. 8 shows a curve of the induction B over the axis of the flux concentrator obtained with a concentrator construction according to FIGS. 5 and 6 and a pulse generator according to FIG. 7.
  • the dimensions given in millimeters correspond to an embodiment that has been tried and tested in practice.
  • two excitation windings with ten windings each with a current of 10,000 A were operated.
  • the turns of the excitation windings were directly water-cooled.
  • the power loss is approx. 5 kW.
  • the accelerator unit shown in Fig. 2 works so that the metering coil 7 is briefly de-energized (see also the upper timing diagram in Fig. 3), so that the induction B of this metering coil also disappears. The abrasive is released and starts to move. If the magnetic flux concentrator 6 acting as an accelerator is excited at the same time (see also the lower time diagram in FIG. 3), a strong acceleration of the blasting agent will start under the influence of the much higher induction B of the flux concentrator. This is only effective during the pulse duration in the accelerator coil. This pulse duration must be set so that the pulse is ended when the blasting agent emerges from the flow concentrator.
  • a measuring coil can be used, which is arranged between the coils 6 and 7 in the embodiment according to FIG. 2.
  • This measuring coil detects incoming blasting agent as an electrical signal in order to ignite a current pulse in the accelerator coil following in the direction of movement (designated 6 in FIG. 2). This enables particularly economical and precise control.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Plasma & Fusion (AREA)
  • General Engineering & Computer Science (AREA)
  • Particle Accelerators (AREA)
EP87111743A 1986-08-28 1987-08-13 Dispositif d'accélération de grenaille magnétique Expired - Lifetime EP0261376B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3629255 1986-08-28
DE3629255A DE3629255C1 (de) 1986-08-28 1986-08-28 Vorrichtung zum Beschleunigen von magnetisch beeinflussbarem Strahlmittel

Publications (3)

Publication Number Publication Date
EP0261376A2 true EP0261376A2 (fr) 1988-03-30
EP0261376A3 EP0261376A3 (en) 1989-01-18
EP0261376B1 EP0261376B1 (fr) 1990-06-13

Family

ID=6308362

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87111743A Expired - Lifetime EP0261376B1 (fr) 1986-08-28 1987-08-13 Dispositif d'accélération de grenaille magnétique

Country Status (2)

Country Link
EP (1) EP0261376B1 (fr)
DE (2) DE3629255C1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2698576A1 (fr) * 1992-11-30 1994-06-03 Framatome Sa Procédé et dispositif de réparation d'une zone défectueuse de la paroi d'une pièce métallique et en particulier d'une pièce tubulaire.
EP1216794A1 (fr) * 2000-11-22 2002-06-26 QED Technologies, Inc. Système et methode pour la finission des surfaces concaves à l'aide des particules abrasives, accelerées par electromagnetisme
WO2017180058A1 (fr) * 2016-04-11 2017-10-19 Abrasive Engineering Pte Ltd Vanne de commande pour grenaillage
TWI790473B (zh) * 2020-08-28 2023-01-21 態金材料科技股份有限公司 以金屬玻璃粒子束切割之方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US754637A (en) * 1902-06-25 1904-03-15 Kristian Birkeland Electromagnetic gun.
CH240861A (de) * 1944-06-17 1946-01-31 Bbc Brown Boveri & Cie Einrichtung zur Erzeugung eines Eisenschrotstrahles hoher Geschwindigkeit.
GB1084496A (en) * 1965-06-15 1967-09-20 British Steel Castings Res Ass Improved method of and equipment for shot-blasting and the like
DE3324710C1 (de) * 1983-07-08 1984-05-30 Jost Dipl.-Ing. 2150 Buxtehude Wadephul Vorrichtung zum Beschleunigen von Strahlmittel

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US754637A (en) * 1902-06-25 1904-03-15 Kristian Birkeland Electromagnetic gun.
CH240861A (de) * 1944-06-17 1946-01-31 Bbc Brown Boveri & Cie Einrichtung zur Erzeugung eines Eisenschrotstrahles hoher Geschwindigkeit.
GB1084496A (en) * 1965-06-15 1967-09-20 British Steel Castings Res Ass Improved method of and equipment for shot-blasting and the like
DE3324710C1 (de) * 1983-07-08 1984-05-30 Jost Dipl.-Ing. 2150 Buxtehude Wadephul Vorrichtung zum Beschleunigen von Strahlmittel

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IEEE TRANSACTIONS ON MAGNETICS, Band MAG-20, Nr. 5, Teil 2, September 1984, Seiten 1810-1812, IEEE, New York, US; G. STANGE: "A small size 7 tesla flux-concentrator of modular construction fed by a small thyristor pulse generator" *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2698576A1 (fr) * 1992-11-30 1994-06-03 Framatome Sa Procédé et dispositif de réparation d'une zone défectueuse de la paroi d'une pièce métallique et en particulier d'une pièce tubulaire.
EP0600768A1 (fr) * 1992-11-30 1994-06-08 Framatome Procédé et dispositif de réparation d'une zone défectueuse de la paroi d'une pièce métallique et en particulier d'une pièce tubulaire
US5443201A (en) * 1992-11-30 1995-08-22 Framatome Method and device for repairing a defective zone of the wall of a metal part and in particular of a tubular part
EP1216794A1 (fr) * 2000-11-22 2002-06-26 QED Technologies, Inc. Système et methode pour la finission des surfaces concaves à l'aide des particules abrasives, accelerées par electromagnetisme
WO2017180058A1 (fr) * 2016-04-11 2017-10-19 Abrasive Engineering Pte Ltd Vanne de commande pour grenaillage
US10882159B2 (en) 2016-04-11 2021-01-05 Abrasive Engineering Pte Ltd Control valve for shot peening
TWI790473B (zh) * 2020-08-28 2023-01-21 態金材料科技股份有限公司 以金屬玻璃粒子束切割之方法

Also Published As

Publication number Publication date
DE3629255C1 (de) 1987-04-02
EP0261376B1 (fr) 1990-06-13
DE3763157D1 (de) 1990-07-19
EP0261376A3 (en) 1989-01-18

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