EP0261376B1 - Dispositif d'accélération de grenaille magnétique - Google Patents

Dispositif d'accélération de grenaille magnétique Download PDF

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Publication number
EP0261376B1
EP0261376B1 EP87111743A EP87111743A EP0261376B1 EP 0261376 B1 EP0261376 B1 EP 0261376B1 EP 87111743 A EP87111743 A EP 87111743A EP 87111743 A EP87111743 A EP 87111743A EP 0261376 B1 EP0261376 B1 EP 0261376B1
Authority
EP
European Patent Office
Prior art keywords
coil
concentrator
accelerating
blasting
blasting abrasive
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
EP87111743A
Other languages
German (de)
English (en)
Other versions
EP0261376A2 (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 particles which can be influenced magnetically, in particular iron particles, for treating workpiece surfaces with one or more electromagnetic accelerator coils (s) arranged along the path of the blasting medium which excite or excite depending on the moving blasting medium will.
  • a device for accelerating a blasting medium consisting of particles which can be influenced magnetically, in particular iron particles, for treating workpiece surfaces with one or more electromagnetic accelerator coils (s) arranged along the path of the blasting medium which excite or excite depending on the moving blasting medium will.
  • the invention is based on the object of creating a device of the type mentioned at the outset, i.e. to create a device in which the blasting medium is accelerated with the aid of the magnetic force generated in an accelerator coil and thereby manages with a lower energy requirement compared to conventional types of acceleration with equivalent performance (throughput quantity of blasting medium 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 by 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.
  • On this Exit is the jet hose 3 recognizable in Fig. 1 placed.
  • the essentially rotationally symmetrical flow concentrator shown in FIG. 4 practically as a section perpendicular to the axis of the movement of the blasting medium has a core 11 constructed from a material which is a good electrical conductor (e.g. copper) and in which a cylindrical useful field bore 12 and a radial slot 13 are provided.
  • the excitation winding which can consist of several turns, is designated by 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, which 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 Ti, T 2 , with which a system constructed according to FIGS. 5 and 6 was tested.
  • the voltage source with the voltage UO charges the capacitor C L , which is periodically discharged via the thyristors Ti, 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 pulse-shaped current flow thus created, the desired one there Effective field 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 ends 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 media 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)

Claims (4)

1. Dispositif pour accélérer une grenaille, constituée de particules influençables magnétiquement, en particulier de particules de fer, pour traiter des surfaces de pièces à traiter, comportant une ou plusieurs bobines accélératrices électromagnétiques qui sont disposées le long du chemin de la grenaille et qui sont excitées ou désexcitées en fonction de la grenaille en mouvement, caractérisé en ce que chaque bobine accélératrice est un concentrateur de flux connu en soi.
2. Dispositif selon la revendication 1, caractérisé en ce qu'une bobine de dosage (7) est montée en amont, en avant du premier concentrateur de flux (6).
3. Dispositif selon la revendication 1 ou 2, caractérisé en ce qu'en avant de chaque bobine accélératrice, dans le sens du mouvement de la limaille, est disposée une bobine de mesure qui saisit la limaille qui arrive sous forme d'un signal électrique pour déclencher une impulsion de courant dans la bobine accélératrice qui suit dans le sens du mouvement.
4. Dispositif selon la revendication 1, caractérisé en ce que deux ou plus bobines excitatrices (14, 15) sont emboîtées concentriquement l'une dans l'autre, étant précisé qu'entre deux bobines excitatrices ainsi disposées, est chaque fois disposée une enveloppe (18) du concentrateur qui sert de noyau et qui est reliée avec le noyau intérieur (11) du concentrateur.
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 EP0261376A2 (fr) 1988-03-30
EP0261376A3 EP0261376A3 (en) 1989-01-18
EP0261376B1 true 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)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2698576B1 (fr) * 1992-11-30 1995-02-17 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.
US6561874B1 (en) * 2000-11-22 2003-05-13 Qed Technologies, Inc Apparatus and method for abrasive jet finishing of deeply concave surfaces using magnetorheological fluid
SG10201602833VA (en) * 2016-04-11 2017-11-29 Abrasive Eng Pte Ltd Magnetic 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
JP7485588B2 (ja) * 2020-11-25 2024-05-16 株式会社日本製鋼所 射出装置

Family Cites Families (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

Also Published As

Publication number Publication date
DE3763157D1 (de) 1990-07-19
EP0261376A2 (fr) 1988-03-30
EP0261376A3 (en) 1989-01-18
DE3629255C1 (de) 1987-04-02

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