EP0606186A1 - Process for removing part of a coating with liquid jets - Google Patents

Process for removing part of a coating with liquid jets Download PDF

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Publication number
EP0606186A1
EP0606186A1 EP94400031A EP94400031A EP0606186A1 EP 0606186 A1 EP0606186 A1 EP 0606186A1 EP 94400031 A EP94400031 A EP 94400031A EP 94400031 A EP94400031 A EP 94400031A EP 0606186 A1 EP0606186 A1 EP 0606186A1
Authority
EP
European Patent Office
Prior art keywords
coating
jet
contour
main
removing part
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
EP94400031A
Other languages
German (de)
French (fr)
Other versions
EP0606186B1 (en
Inventor
Pierre Marc Serge Lechervy
Paul Louis Silva
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 Aircraft Engines SAS
Lexvall SA
Original Assignee
Societe Nationale dEtude et de Construction de Moteurs dAviation SNECMA
SNECMA SAS
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 dEtude et de Construction de Moteurs dAviation SNECMA, SNECMA SAS filed Critical Societe Nationale dEtude et de Construction de Moteurs dAviation SNECMA
Publication of EP0606186A1 publication Critical patent/EP0606186A1/en
Application granted granted Critical
Publication of EP0606186B1 publication Critical patent/EP0606186B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
    • B24C1/08—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for polishing surfaces, e.g. smoothing a surface by making use of liquid-borne abrasives
    • B24C1/086—Descaling; Removing coating films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/02—Cleaning by the force of jets or sprays
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
    • B24C1/04—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for treating only selected parts of a surface, e.g. for carving stone or glass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C3/00—Abrasive blasting machines or devices; Plants
    • B24C3/02—Abrasive blasting machines or devices; Plants characterised by the arrangement of the component assemblies with respect to each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C5/00—Devices or accessories for generating abrasive blasts
    • B24C5/02—Blast guns, e.g. for generating high velocity abrasive fluid jets for cutting materials
    • B24C5/04—Nozzles therefor

Definitions

  • the invention relates to a method for removing a portion of a coating by means of liquid jets. Its field of application is more precisely the sheets initially covered with a coating intended to oppose a welding or a brazing by diffusion of this sheet with another which is attached to it when a sufficient pressure crushes them one on the 'other.
  • Certain structures are manufactured by exploiting the so-called superplasticity properties of certain alloys.
  • Two sheets of these alloys are superimposed and placed between two dies, at least one of which has cavities of determined shape.
  • the dies are pressed towards each other and a suitable device makes it possible to inject gas under pressure between the sheets, the material of which flows in the cavities until it follows their outline while being welded by diffusion to the other. sheet metal in front of other parts of the dies. It is however necessary to cover one of the sheets with a deposit of yttrium oxide or of another product having the property of opposing diffusion welding in places where this welding is not desired and in particular in front of the cavities.
  • a process of this kind is illustrated by American patent n ° 4,220,276.
  • the deposit is in practice projected in plasma over the entire surface after a mask has been placed at the places where the deposit must be removed, then the mask is torn off from the surface with the part of the deposit covering it.
  • depositing the mask and preparing it, in particular by cutting it out at the desired locations takes time and there is a risk of deterioration of the support during cutting.
  • the invention relates to a process intended to produce an identical product, the essential element of which is the use of a jet of pressurized liquid to tear off the coating at the places it strikes, without interposing a mask.
  • jets of pressurized liquid for material removal purposes. They are normally jets carrying abrasive particles, for example garnet, which cut sheets, sheets or the like.
  • abrasive particles for example garnet
  • the application is a little different since here we want to spare the sheet itself, which generally requires not to use abrasive in the liquid, but we still find a classic problem of these machining that the contour of the material removed is serrated and lacks sharpness.
  • the consequence is that the shape of the parts of the sheets flowing in the cavities which generally have to constitute stiffening ribs is not sufficiently regular, which can have a negative influence on the mechanical strength of the structure. obtained.
  • the technical effect of the invention consists of perfectly clear, precise and regular contours of the portion from which the coating is removed.
  • the means used for this purpose consists of at least one main pass conducted with a wide jet of liquid where the coating is removed over almost the entire portion and at least one finishing pass conducted with a fine jet where the coating is removed over the contour portion; the fine jet can be inclined laterally with respect to the contour and directed towards the portion, since the inventors have found that this arrangement gives better results.
  • the main and finishing passes can be successive or advantageously, they can be simultaneous thanks to the use of a head with multiple jets.
  • the sheet 1 of FIGS. 1 and 2 is made of superplastic titanium alloy and is covered with a coating 2 of yttrium oxide on its upper surface, but a portion 3 which may be formed of interlaced bands should be released. partitioning parts intended to be deformed. There is therefore (FIG. 2) a wide jet nozzle 4 intended for removing the coating on the major part of the strips of the portion 3 and two fine jet nozzles 5 and 6 intended for removing the coating around the edges of the strips of the portion 3.
  • the fine jet nozzles 5 and 6 pass after the wide jet nozzle 4, in the course of a completely separate pass or by closely following this nozzle 4.
  • the nozzles 4, 5 and 6 can then all be arranged on a connecting frame 7 which unites them.
  • This frame can be formed of deformable elements to adapt the arrangement of the nozzles to all eventualities.
  • the fine jet nozzles 5 and 6 can be inclined at a small angle, approximately 10 to 20 °, in a lateral direction relative to the direction of the strip considered so that the fine jets are directed towards the strip in question, which chamfers the edges of the deposit 2, corrects them better and makes it possible to obtain a greater sharpness of the edges in avoiding chipping.
  • the liquid may be pure water or loaded with an abrasive which is incapable of damaging the sheet material 1. It is possible to use several wide jet nozzles 4 if the portion 3 is formed of strips whose width l required. It is also possible to use a single fine jet nozzle which is then responsible for rectifying the entire contour of the portion 3.

Abstract

Method for removing a part of a coating (2) of a metal sheet (1). Concurrent use is made of a wide-jet nozzle (4) which removes most of the material and at least one narrow-jet nozzle (5 or 6) which tidies up the outline of the material removed. Application to the removal of plasma-deposited deposits and particularly deposits which oppose the diffusion welding or brazing of a metal sheet to another one. <IMAGE>

Description

L'invention concerne un procédé pour ôter une portion d'un revêtement par des jets de liquide. Son domaine d'application est plus précisément les tôles initialement recouvertes d'un revêtement destiné à s'opposer à un soudage ou un brasage par diffusion de cette tôle avec une autre qui lui est accolée quand une pression suffisante les écrase l'une sur l'autre.The invention relates to a method for removing a portion of a coating by means of liquid jets. Its field of application is more precisely the sheets initially covered with a coating intended to oppose a welding or a brazing by diffusion of this sheet with another which is attached to it when a sufficient pressure crushes them one on the 'other.

Certaines structures sont fabriquées en exploitant les propriétés dites de superplasticité de certains alliages. Deux tôles de ces alliages sont superposées et placées entre deux matrices dont l'une au moins comporte des cavités de forme déterminée. Les matrices sont pressées l'une vers l'autre et un dispositif adapté permet d'insuffler du gaz sous pression entre les tôles, dont la matière flue dans les cavités jusqu'à épouser leur contour tout en se soudant par diffusion à l'autre tôle devant d'autres parties des matrices. Il est toutefois nécessaire de recouvrir une des tôles d'un dépôt d'oxyde d'yttrium ou d'un autre produit ayant la propriété de s'opposer au soudage par diffusion aux endroits où ce soudage n'est pas souhaité et notamment devant les cavités. Un procédé de ce genre est illustré par le brevet américain n° 4 220 276. Toutefois, le dépôt est en pratique projeté en plasma sur la totalité de la surface après qu'un masque a été placé aux endroits où le dépôt doit être retiré, puis le masque est arraché de la surface avec la partie du dépôt qui le recouvre. Mais le dépôt du masque et sa préparation, notamment en le découpant aux endroits voulus, prennent du temps et il y a des risques de détérioration du support lors de la découpe.Certain structures are manufactured by exploiting the so-called superplasticity properties of certain alloys. Two sheets of these alloys are superimposed and placed between two dies, at least one of which has cavities of determined shape. The dies are pressed towards each other and a suitable device makes it possible to inject gas under pressure between the sheets, the material of which flows in the cavities until it follows their outline while being welded by diffusion to the other. sheet metal in front of other parts of the dies. It is however necessary to cover one of the sheets with a deposit of yttrium oxide or of another product having the property of opposing diffusion welding in places where this welding is not desired and in particular in front of the cavities. A process of this kind is illustrated by American patent n ° 4,220,276. However, the deposit is in practice projected in plasma over the entire surface after a mask has been placed at the places where the deposit must be removed, then the mask is torn off from the surface with the part of the deposit covering it. However, depositing the mask and preparing it, in particular by cutting it out at the desired locations, takes time and there is a risk of deterioration of the support during cutting.

L'invention est relative à un procédé destiné à parvenir à un produit identique et dont l'élément essentiel est l'utilisation d'un jet de liquide sous pression pour arracher le revêtement aux endroits qu'il frappe, sans interposer de masque.The invention relates to a process intended to produce an identical product, the essential element of which is the use of a jet of pressurized liquid to tear off the coating at the places it strikes, without interposing a mask.

L'utilisation de jets de liquide sous pression à des fins d'enlèvement de matière est maintenant bien connue. Il s'agit normalement de jets porteurs de particules abrasives, de grenat par exemple, qui découpent des tôles, des feuilles ou des produits analogues. L'application est un peu différente puisqu'on veut ici épargner la tôle elle-même, ce qui impose généralement de ne pas employer d'abrasif dans le liquide, mais on retrouve tout de même un problème classique de ces usinages que le contour de la matière enlevée est dentelé et manque de netteté. Dans l'application actuelle, la conséquence est que la forme des parties des tôles fluant dans les cavités qui doivent généralement constituer des nervures de raidissement n'est pas suffisamment régulière, ce qui peut avoir une influence négative sur la tenue mécanique de la structure finalement obtenue.The use of jets of pressurized liquid for material removal purposes is now well known. They are normally jets carrying abrasive particles, for example garnet, which cut sheets, sheets or the like. The application is a little different since here we want to spare the sheet itself, which generally requires not to use abrasive in the liquid, but we still find a classic problem of these machining that the contour of the material removed is serrated and lacks sharpness. In the current application, the consequence is that the shape of the parts of the sheets flowing in the cavities which generally have to constitute stiffening ribs is not sufficiently regular, which can have a negative influence on the mechanical strength of the structure. obtained.

L'effet technique de l'invention consiste en des contours parfaitement nets, précis et réguliers de la portion dont le revêtement est enlevé. Le moyen utilisé à cette fin consiste en au moins une passe principale menée avec un jet large de liquide où le revêtement est ôté sur presque toute la portion et au moins une passe de finition menée avec un jet fin où le revêtement est ôté sur le contour de la portion ; le jet fin peut être incliné latéralement par rapport au contour et dirigé vers la portion, car les inventeurs on constaté que cette disposition donnait de meilleurs résultats.The technical effect of the invention consists of perfectly clear, precise and regular contours of the portion from which the coating is removed. The means used for this purpose consists of at least one main pass conducted with a wide jet of liquid where the coating is removed over almost the entire portion and at least one finishing pass conducted with a fine jet where the coating is removed over the contour portion; the fine jet can be inclined laterally with respect to the contour and directed towards the portion, since the inventors have found that this arrangement gives better results.

Les passes principale et de finition peuvent être successives ou avantageusement, elles peuvent être simultanées grâce à l'utilisation d'une tête à jets multiples.The main and finishing passes can be successive or advantageously, they can be simultaneous thanks to the use of a head with multiple jets.

On va maintenant décrire l'invention à l'aide des figures 1 et 2 annexées à titre illustratif et non limitatif :

  • la figure 1 illustre une tôle partiellement recouverte d'un dépôt,
  • et la figure 2 illustre le procédé.
The invention will now be described with the aid of FIGS. 1 and 2 annexed by way of illustration and not limitation:
  • FIG. 1 illustrates a sheet partially covered with a deposit,
  • and Figure 2 illustrates the process.

La tôle 1 des figures 1 et 2 est en alliage superplastique de titane et est recouverte d'un revêtement 2 d'oxyde d'yttrium sur sa surface supérieure, mais il convient d'en dégager une portion 3 qui peut être formée de bandes entrecroisées cloisonnant des parties destinées à être déformées. On dispose donc (figure 2) une buse à jet large 4 destinée à ôter le revêtement sur la plus grande partie des bandes de la portion 3 et deux buses à jet fin 5 et 6 destinées à ôter le revêtement au contour des bandes de la portion 3. Les buses à jet fin 5 et 6 passent après la buse à jet large 4, au cours d'une passe entièrement séparées ou en suivant de peu cette buse 4. Les buses 4, 5 et 6 peuvent être alors toutes trois disposées sur un cadre de liaison 7 qui les unit. Ce cadre peut être formé d'éléments déformables pour adapter la disposition des buses à toutes les éventualités. En particulier, les buses à jet fin 5 et 6 peuvent être inclinées d'un petit angle, 10 à 20° environ, en direction latérale par rapport à la direction de la bande considérée de sorte que les jets fins soient dirigés vers la bande en question, ce qui chanfreine les bords du dépôt 2, les rectifie mieux et permet d'obtenir une plus grande netteté des bords en évitant de les écailler.The sheet 1 of FIGS. 1 and 2 is made of superplastic titanium alloy and is covered with a coating 2 of yttrium oxide on its upper surface, but a portion 3 which may be formed of interlaced bands should be released. partitioning parts intended to be deformed. There is therefore (FIG. 2) a wide jet nozzle 4 intended for removing the coating on the major part of the strips of the portion 3 and two fine jet nozzles 5 and 6 intended for removing the coating around the edges of the strips of the portion 3. The fine jet nozzles 5 and 6 pass after the wide jet nozzle 4, in the course of a completely separate pass or by closely following this nozzle 4. The nozzles 4, 5 and 6 can then all be arranged on a connecting frame 7 which unites them. This frame can be formed of deformable elements to adapt the arrangement of the nozzles to all eventualities. In particular, the fine jet nozzles 5 and 6 can be inclined at a small angle, approximately 10 to 20 °, in a lateral direction relative to the direction of the strip considered so that the fine jets are directed towards the strip in question, which chamfers the edges of the deposit 2, corrects them better and makes it possible to obtain a greater sharpness of the edges in avoiding chipping.

Le liquide peut être de l'eau pure ou chargée d'un abrasif inapte à endommager le matériau de la tôle 1. Il est possible d'utiliser plusieurs buses à jet large 4 si la portion 3 est formée de bandes dont la largeur l'exige. On peut aussi employer une seule buse à jet fin qui est alors chargée de la rectification de l'ensemble du contour de la portion 3.The liquid may be pure water or loaded with an abrasive which is incapable of damaging the sheet material 1. It is possible to use several wide jet nozzles 4 if the portion 3 is formed of strips whose width l required. It is also possible to use a single fine jet nozzle which is then responsible for rectifying the entire contour of the portion 3.

Claims (4)

Procédé pour ôter une portion (3) d'un revêtement (2) destiné à s'opposer à un soudage par diffusion et qui recouvre une surface d'une tôle (1), caractérisé en ce qu'il comprend au moins une passe principale menée avec un jet large (4) de liquide où le revêtement est ôté sur presque toute la portion (3) et au moins une passe de finition menée avec un jet fin (5, 6) où le revêtement est ôté sur le contour de la portion.Method for removing a portion (3) of a coating (2) intended to oppose diffusion welding and which covers a surface of a sheet (1), characterized in that it comprises at least one main pass conducted with a wide jet (4) of liquid where the coating is removed over almost the entire portion (3) and at least one finishing pass conducted with a fine jet (5, 6) where the coating is removed around the contour of the portion. Procédé selon la revendication 1, caractérisé en ce que le jet fin est incliné latéralement par rapport au contour et dirigé vers la portion.Method according to claim 1, characterized in that the fine jet is inclined laterally with respect to the contour and directed towards the portion. Procédé selon l'une des revendications 1 ou 2, caractérisé en ce que les passes principale et de finition sont successives.Method according to one of claims 1 or 2, characterized in that the main and finishing passes are successive. Procédé selon l'une des revendications 1 ou 2, caractérisé en ce que les passes principale et de finition sont simultanées et réalisées au moyen d'une tête à jets multiples.Method according to one of claims 1 or 2, characterized in that the main and finishing passes are simultaneous and carried out by means of a head with multiple jets.
EP94400031A 1993-01-06 1994-01-06 Process for removing part of a coating with liquid jets Expired - Lifetime EP0606186B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9300042 1993-01-06
FR9300042A FR2700132B1 (en) 1993-01-06 1993-01-06 Method for removing a portion of a coating by jets of liquid.

Publications (2)

Publication Number Publication Date
EP0606186A1 true EP0606186A1 (en) 1994-07-13
EP0606186B1 EP0606186B1 (en) 1996-10-09

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EP94400031A Expired - Lifetime EP0606186B1 (en) 1993-01-06 1994-01-06 Process for removing part of a coating with liquid jets

Country Status (7)

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US (1) US5413270A (en)
EP (1) EP0606186B1 (en)
JP (1) JPH06238599A (en)
CA (1) CA2112657C (en)
DE (1) DE69400641T2 (en)
ES (1) ES2092862T3 (en)
FR (1) FR2700132B1 (en)

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WO2002090052A1 (en) * 2001-05-03 2002-11-14 The Morgan Crucible Company Plc Abrasive blast machining

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GB0002704D0 (en) * 2000-02-08 2000-03-29 Circle Technical Services Limi Gas cutting shroud
GB2375064B (en) * 2001-05-03 2003-06-04 Morgan Crucible Co Abrasive blast machining
EP1944110B1 (en) * 2007-01-15 2012-11-07 Fraisa Holding AG Method of processing and machining tools for the machining of workpieces by chip removal
KR200460309Y1 (en) 2010-08-06 2012-05-21 대우조선해양 주식회사 Clamp structure of blasting nozzle for robot
US8821213B2 (en) * 2010-10-07 2014-09-02 Omax Corporation Piercing and/or cutting devices for abrasive waterjet systems and associated systems and methods
DE102011051737B4 (en) * 2011-07-11 2015-09-17 Hammelmann Maschinenfabrik Gmbh Method and device for the partial removal of a coating
CN102935619A (en) * 2011-08-15 2013-02-20 鸿富锦精密工业（深圳）有限公司 Sand blasting device
US9586306B2 (en) 2012-08-13 2017-03-07 Omax Corporation Method and apparatus for monitoring particle laden pneumatic abrasive flow in an abrasive fluid jet cutting system
US8904912B2 (en) 2012-08-16 2014-12-09 Omax Corporation Control valves for waterjet systems and related devices, systems, and methods
CN105437085A (en) * 2015-12-22 2016-03-30 江南大学 Cutting experiment device of abrasive water jet image
US11577366B2 (en) 2016-12-12 2023-02-14 Omax Corporation Recirculation of wet abrasive material in abrasive waterjet systems and related technology
US11554461B1 (en) 2018-02-13 2023-01-17 Omax Corporation Articulating apparatus of a waterjet system and related technology
US11224987B1 (en) 2018-03-09 2022-01-18 Omax Corporation Abrasive-collecting container of a waterjet system and related technology
CN110421328B (en) * 2019-07-30 2020-07-07 中国工程物理研究院机械制造工艺研究所 Ultra-precision processing method of cerium lanthanum alloy
CN111267006B (en) * 2020-02-28 2020-11-20 中冶京诚工程技术有限公司 Metal plate and strip descaling equipment and method and sand thrower used by same
EP4127479A1 (en) 2020-03-30 2023-02-08 Hypertherm, Inc. Cylinder for a liquid jet pump with multi-functional interfacing longitudinal ends
FR3140293A1 (en) * 2022-09-29 2024-04-05 Safran Aircraft Engines MACHINING DEVICE

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Also Published As

Publication number Publication date
FR2700132B1 (en) 1995-02-03
CA2112657A1 (en) 1994-07-07
FR2700132A1 (en) 1994-07-08
EP0606186B1 (en) 1996-10-09
US5413270A (en) 1995-05-09
JPH06238599A (en) 1994-08-30
DE69400641D1 (en) 1996-11-14
DE69400641T2 (en) 1997-02-27
CA2112657C (en) 2004-04-06
ES2092862T3 (en) 1996-12-01

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