FR2814972A1 - METHOD OF BREWING A SURFACE PREVIOUSLY MACHINED BY ELECTRO-EROSION - Google Patents
METHOD OF BREWING A SURFACE PREVIOUSLY MACHINED BY ELECTRO-EROSION Download PDFInfo
- Publication number
- FR2814972A1 FR2814972A1 FR0012705A FR0012705A FR2814972A1 FR 2814972 A1 FR2814972 A1 FR 2814972A1 FR 0012705 A FR0012705 A FR 0012705A FR 0012705 A FR0012705 A FR 0012705A FR 2814972 A1 FR2814972 A1 FR 2814972A1
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- Prior art keywords
- decontamination
- brazing
- brazing method
- electro
- erosion
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/20—Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Laser Beam Processing (AREA)
Abstract
Description
<Desc/Clms Page number 1> <Desc / Clms Page number 1>
PROCÉDÉ DE BRASAGE D'UNE SURFACE PRÉALABLEMENT USINÉE
PAR ÉLECTRO-ÉROSION DESCRIPTION
Le sujet de cette invention est le brasage de surfaces préalablement usinées par l'électro- érosion, après décontamination de ces surfaces. METHOD OF BRAZING A PRE-MACHINED SURFACE
BY ELECTRO-EROSION DESCRIPTION
The subject of this invention is the brazing of surfaces previously machined by EDM, after decontamination of these surfaces.
L'électro-érosion est un procédé largement pratiqué pour réaliser des usinages de précision sur diverses pièces. Un exemple est l'usinage de plaquettes d'aube afin de réaliser à leur base une surface qui doit ensuite être appliquée sur une surface complémentaire d'un moyeu ou d'un anneau de carter afin d'y réaliser un brasage qui soude la plaquette à ce support pour réaliser un corps aubagé compact, qui peut être plus facile à réaliser et plus résistant que les agencements classiques où les aubes sont des pièces séparées pourvues de pieds qu'on engage dans des rainures de la pièce de support. EDM is a widely used process for performing precision machining on various parts. An example is the machining of blade inserts in order to produce a surface at their base which must then be applied to a complementary surface of a hub or a housing ring in order to achieve soldering which welds the insert to this support to produce a compact bladed body, which can be easier to produce and more resistant than conventional arrangements where the blades are separate parts provided with feet which are engaged in grooves of the support part.
Le brasage ne peut toutefois pas bien être réalisé directement sur la surface soumise à une électro-érosion, puisque ce procédé y laisse subsister une couche d'oxyde mince, dont la cohésion avec le reste de la matière de la plaquette est faible et qui est fissurée : même si le brasage est possible, des amorces de rupture en fatigue menant à la rupture ou à la séparation de l'aube apparaissent facilement pendant le service. Brazing cannot, however, be carried out directly on the surface subjected to electro-erosion, since this process leaves a thin oxide layer remaining there, whose cohesion with the rest of the material of the wafer is weak and which is cracked: even if brazing is possible, fatigue fractures leading to breakage or separation of the blade easily appear during service.
C'est pourquoi il est d'usage de soumettre la surface électro-érodée à une décontamination avant This is why it is customary to subject the electro-eroded surface to decontamination before
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de réaliser la brasure. Trois procédés ont été employés jusqu'à présent : le décapage manuel, le fraisage et le bain acide ; mais ces procédés présentent tous certains inconvénients, qui peuvent parfois les rendre inapplicables. Le décapage manuel est très lent et s'accompagne d'irrégularité dans le travail, qui produit des ondulations sur la surface traiter, donc une moins bonne jonction des surfaces à unir ; le fraisage n'est possible que sur des surfaces planes et facilement accessibles et que sur certains matériaux ; quant au bain acide, il attaque non seulement la surface à décaper mais les surfaces avoisinantes de la pièce. to make the solder. Three processes have been used so far: manual pickling, milling and the acid bath; but these methods all have certain drawbacks, which can sometimes make them inapplicable. The manual pickling is very slow and is accompanied by irregularity in the work, which produces undulations on the surface to be treated, therefore a less good junction of the surfaces to be united; milling is only possible on flat and easily accessible surfaces and on certain materials; as for the acid bath, it attacks not only the surface to be stripped but the surrounding surfaces of the room.
Un nouveau procédé de brasage a donc été conçu et forme le sujet de cette invention : pour résumer, on propose d'utiliser un faisceau de laser pour éliminer la couche d'oxyde qui couvre défavorablement la surface des pièces ayant été soumises à l'électro-érosion. Le brasage succède à cette opération de décontamination, ou s'exerce sur des pièces ainsi préparées. A new brazing process has therefore been designed and forms the subject of this invention: to sum up, it is proposed to use a laser beam to remove the oxide layer which unfavorably covers the surface of the parts having been subjected to electro -erosion. Brazing follows this decontamination operation, or is carried out on parts thus prepared.
L'usinage au laser est déjà connu, mais cette application de décontamination apparaît comme nouvelle et s'accompagne d'ailleurs d'un fonctionnement particulier du laser. Laser machining is already known, but this decontamination application appears to be new and is also accompanied by a particular functioning of the laser.
Ainsi, on procède plutôt par des impulsions du faisceau, qui soumettent la couche à éliminer à des chocs thermiques qui ont pour effet de l'écailler, grâce à sa faible cohésion. Un exemple concret est donné ci-après. Thus, one proceeds rather by pulses of the beam, which subject the layer to be eliminated to thermal shocks which have the effect of flaking, thanks to its weak cohesion. A concrete example is given below.
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On conseille de balayer la surface à décontaminer en passes successives, éventuellement à une vitesse assez grande, une impulsion lumineuse d'une durée de 3 millisecondes pouvant être appliquée à une fréquence de 20 impulsions par seconde, ce qui signifie que le faisceau est actif pendant 6% du temps ; l'impulsion peut avoir une énergie de 0,5 joule pour une vitesse de balayage de 1000 millimètres par minute, et les passes sont espacées, de 1 millimètre de distance, la tache du faisceau laser sur la surface à décontaminer ayant 2 mm de diamètre. Ce procédé a été réalisé avec un laser YAG de type Nd de 400 watts de puissance maximale et de 1064 nanomètres de longueur d'onde. La pièce à décontaminer était en un alliage à base de nickel et comprenait une couche d'oxyde de 5 à 30 microns d'épaisseur. Après la décontamination, des observations de micrographie montrèrent que l'épaisseur des altérations d'oxyde avait été ramenée entre 0 et moins de 5 micromètres. We recommend scanning the surface to be decontaminated in successive passes, possibly at a fairly high speed, a light pulse lasting 3 milliseconds which can be applied at a frequency of 20 pulses per second, which means that the beam is active for 6% of the time; the pulse can have an energy of 0.5 joule for a scanning speed of 1000 millimeters per minute, and the passes are spaced, 1 millimeter apart, the spot of the laser beam on the surface to be decontaminated having 2 mm in diameter . This process was carried out with a YAG laser of the Nd type with 400 watts of maximum power and 1064 nanometers in wavelength. The part to be decontaminated was made of a nickel-based alloy and included an oxide layer of 5 to 30 microns thick. After decontamination, micrographic observations showed that the thickness of the oxide alterations had been reduced to between 0 and less than 5 micrometers.
Il est à noter que le rayonnement du laser peut altérer la matière de base, notamment en créant encore une couche d'oxyde, mais que cette couche, à l'inverse de celle qu'on obtient par l'électro-érosion, n'est pas fissurée et ne compromet donc pas l'assemblage des pièces consécutif au brasage. Aucune corrosion intergranulaire n'est non plus produite par cette décontamination, contrairement à certains procédés d'attaque chimique. It should be noted that the radiation from the laser can alter the base material, in particular by still creating an oxide layer, but that this layer, unlike that obtained by EDM, does not is not cracked and therefore does not compromise the assembly of parts following brazing. No intergranular corrosion is produced by this decontamination either, unlike certain chemical attack processes.
Le balayage de la surface par le faisceau peut facilement être fait en programmant une machine à commande numérique. Des surfaces non planes de formes Scanning the surface by the beam can easily be done by programming a numerically controlled machine. Non-planar surfaces of shapes
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complexes peuvent ainsi être décontaminées, contrairement aux procédés classiques. Outre les alliages de nickel, des alliages de RBD peuvent avantageusement se voir appliquer l'invention. La distance entre les passes du faisceau sera usuellement de 0,5 à 1 mm. complexes can thus be decontaminated, unlike conventional methods. In addition to nickel alloys, RBD alloys can advantageously be applied to the invention. The distance between the beam passes will usually be 0.5 to 1 mm.
Claims (9)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0012705A FR2814972B1 (en) | 2000-10-05 | 2000-10-05 | METHOD OF BREWING A SURFACE PREVIOUSLY MACHINED BY ELECTRO-EROSION |
JP2002532003A JP2004510584A (en) | 2000-10-05 | 2001-10-04 | Brazing of surfaces pre-machined by electrical discharge machining |
PCT/FR2001/003053 WO2002028587A1 (en) | 2000-10-05 | 2001-10-04 | Method for bonding a surface pre-machined by electrical discharge machining |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0012705A FR2814972B1 (en) | 2000-10-05 | 2000-10-05 | METHOD OF BREWING A SURFACE PREVIOUSLY MACHINED BY ELECTRO-EROSION |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2814972A1 true FR2814972A1 (en) | 2002-04-12 |
FR2814972B1 FR2814972B1 (en) | 2003-02-21 |
Family
ID=8855015
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR0012705A Expired - Lifetime FR2814972B1 (en) | 2000-10-05 | 2000-10-05 | METHOD OF BREWING A SURFACE PREVIOUSLY MACHINED BY ELECTRO-EROSION |
Country Status (3)
Country | Link |
---|---|
JP (1) | JP2004510584A (en) |
FR (1) | FR2814972B1 (en) |
WO (1) | WO2002028587A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9061375B2 (en) * | 2009-12-23 | 2015-06-23 | General Electric Company | Methods for treating superalloy articles, and related repair processes |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5193738A (en) * | 1992-09-18 | 1993-03-16 | Microfab Technologies, Inc. | Methods and apparatus for soldering without using flux |
US5513791A (en) * | 1994-03-28 | 1996-05-07 | General Electric Company | Strippable mask patterning of stop-off for diffusion bond processing |
DE19503983A1 (en) * | 1995-02-07 | 1996-08-08 | Koenen Gmbh | Laser-perforated metal mask prodn. esp. for SMD technology |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2836993B2 (en) * | 1991-05-27 | 1998-12-14 | 松下電工株式会社 | Metal plate joining method |
JPH07204837A (en) * | 1994-01-19 | 1995-08-08 | Ishikawajima Harima Heavy Ind Co Ltd | Joining method for nickel based oxide dispersion strengthening alloy member |
JPH08229819A (en) * | 1994-12-22 | 1996-09-10 | Mitsubishi Heavy Ind Ltd | Brazing method by two-stage blasting process |
JP3152607B2 (en) * | 1996-02-14 | 2001-04-03 | 株式会社日立製作所 | Micro sample collection apparatus and method |
JP3385925B2 (en) * | 1997-08-05 | 2003-03-10 | 株式会社日立製作所 | Electronic circuit manufacturing method |
JP2000150771A (en) * | 1998-08-31 | 2000-05-30 | Ricoh Microelectronics Co Ltd | Electronic part, electrode surface treatment thereof and its device |
-
2000
- 2000-10-05 FR FR0012705A patent/FR2814972B1/en not_active Expired - Lifetime
-
2001
- 2001-10-04 WO PCT/FR2001/003053 patent/WO2002028587A1/en unknown
- 2001-10-04 JP JP2002532003A patent/JP2004510584A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5193738A (en) * | 1992-09-18 | 1993-03-16 | Microfab Technologies, Inc. | Methods and apparatus for soldering without using flux |
US5513791A (en) * | 1994-03-28 | 1996-05-07 | General Electric Company | Strippable mask patterning of stop-off for diffusion bond processing |
DE19503983A1 (en) * | 1995-02-07 | 1996-08-08 | Koenen Gmbh | Laser-perforated metal mask prodn. esp. for SMD technology |
Also Published As
Publication number | Publication date |
---|---|
WO2002028587A1 (en) | 2002-04-11 |
JP2004510584A (en) | 2004-04-08 |
FR2814972B1 (en) | 2003-02-21 |
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