EP0659523B1 - Apparatus for sandblasting surfaces, which are not directly accessible - Google Patents
Apparatus for sandblasting surfaces, which are not directly accessible Download PDFInfo
- Publication number
- EP0659523B1 EP0659523B1 EP94402963A EP94402963A EP0659523B1 EP 0659523 B1 EP0659523 B1 EP 0659523B1 EP 94402963 A EP94402963 A EP 94402963A EP 94402963 A EP94402963 A EP 94402963A EP 0659523 B1 EP0659523 B1 EP 0659523B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- shot
- blasting
- duct
- sleeve
- propulsion means
- 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
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C7/00—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts
- B24C7/0046—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a gaseous carrier
-
- 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
- B24C3/04—Abrasive blasting machines or devices; Plants characterised by the arrangement of the component assemblies with respect to each other stationary
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C3/00—Abrasive blasting machines or devices; Plants
- B24C3/18—Abrasive blasting machines or devices; Plants essentially provided with means for moving workpieces into different working positions
- B24C3/20—Abrasive blasting machines or devices; Plants essentially provided with means for moving workpieces into different working positions the work being supported by turntables
- B24C3/22—Apparatus using nozzles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C3/00—Abrasive blasting machines or devices; Plants
- B24C3/32—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks
- B24C3/325—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks for internal surfaces, e.g. of tubes
Definitions
- the invention relates to treatment mechanical by blasting surfaces with difficulty accessible, for example internal cavities of a container or relatively shaped interior object complex.
- the invention applies more particularly to the final treatment of surfaces of the interior of a turbojet rotor.
- Shot blasting consists of projecting very high speed metal balls with a diameter of in the range of 0.2 to 0.6 mm. Such hammering allows to obtain the expected surface treatment.
- the rotor of a turbojet engine has inside a large number of radial grooves, called stiffeners which form a large number of annular internal cavities that it is also necessary to blast.
- stiffeners which form a large number of annular internal cavities that it is also necessary to blast.
- the difficulty of setting work of this operation forced the builders to turbomachines to design such rotors in several parts, so that you can have access to the surfaces internal to be treated by shot blasting. It follows a lack of structural homogeneity of the rotor.
- the main object of the invention is to allow the construction of a turbomachine rotor by one piece while allowing the shot blasting of all internal surfaces to be treated by this process.
- the shot blasting technique consists of project metal balls at very high speed by means of one or more compressed air sources at high pressure.
- the balls are thus transported in pipes leading to a terminal nozzle of projection.
- the slightest change of direction along the flow path high pressure propelled balls in the pipeline constitutes a significant pressure drop and power.
- the performance of the installation of shot peening is therefore dependent on this type of pitfall.
- the internal cavities of a turbomachine rotor do not are not accessible via a straight pipe. In indeed, they are not visible. They don't are accessible only through the central rotor channel on which each of these cavities opens. In others terms, the internal cavities of a turbomachine rotor are practically not accessible to shot blasting of sufficient power.
- the shot blasting line (s) should therefore avoid making changes brutal management. It is the same for the nozzle of projection that we may have to predict with a deflection surface, called projection anvil, depending on the position and orientation of the surfaces to treat.
- the fixing of the shot blasting pipe at the outlet of means of propulsion is obtained on the sleeve by a lockable bayonet mount and unlockable, to allow rapid disassembly of this pipeline.
- the nozzle is temporarily fixed by screwing, to can be changed at will depending on the orientation surfaces to be shot blasted.
- the device can advantageously be supplemented by a pressure screw to slow down or block rotation of the turbine.
- the first two and the third compressed air line are kept substantially parallel until the means propulsion by means of at least one rigid column.
- the device according to the invention comprises a foot fixed on a displacement axis integral with a shot blasting machine on the horizontal turntable which the workpiece is fixed so that the shot blasting pipe is located horizontally introduced into an internal toric space of the rotor shot blasting machine.
- Figure 1 shows a rotor 10 of turbojet engine mounted on the horizontal turntable 2 a shot blasting machine 1.
- This rotor 10 is therefore driven by a rotational movement around a vertical axis 3 of the shot blasting machine in order to subject all internal surfaces of rotor 10 the treatment of shot blasting.
- radial ribs 12 being positioned horizontally inside the rotor 10. They constitute stiffeners necessary for holding rotor mechanics 10. They define cavities interior 11 whose walls are therefore shot blasting. It can be seen that these cavities 11 are inaccessible directly and that any element in front working inside these must form a elbow to be able to access it.
- the shot blasting device is equipped with a foot 4 supporting a horizontal bracket 5.
- This leg 4 is fixed on an axis of displacement 4A of the shot blasting machine 1. It allows to install the blasting system coaxially to the vertical axis 3 of the shot blasting machine 1.
- the system according to the invention has been symbolized by a vertical column 6, fixed to the gallows 5 and inside which are introduced supply lines for the shot blasting.
- a first supply line in shot 7 is shown, as well as one of compressed air supply lines 8.
- the operational part of the shot blasting according to the invention is symbolized by the lower end of column 6 supporting a blasting line 9 directed inwards of a cavity 11. It is understood that a rotation of the plate horizontal 2 carrying the rotor 10 relative to this shot blasting line 9 around the vertical axis 3 makes it possible to project inside a cavity 11 the shot blasting on 360 ° and thus treat such 11 complete annular cavity, one movement additional rotation of the pipeline from shot peening 9 around its horizontal axis being deputy, as detailed below.
- FIG. 2 is a half-section of the rotor 10 of FIG. 1, different shot projection nozzles are used.
- a first nozzle 20 is used to project the shot in the corners 13 distant from the axis 3.
- This first nozzle 20 has an anvil 20A equipped an inclined surface to deflect the shot of shot, in cooperation with an inclined pipe 20B of this same nozzle 20.
- a second anvil 21 has been shown mounted on the shot blasting line 9 for treating corners close to the axis 3 of the cavity 11.
- a anvil 21A different from the first 20A, is used. Indeed, it has a convex surface allowing to push the shot towards the corners 14 by means of at least one inclined pipe 20B in direction of these corners 14 close to the axis 3.
- We specifies that the performance of such an anvil is lower than the previous one, given the fact of the sharp change in direction of the flow of shot, consuming a lot of energy.
- a third projection nozzle 22 has been shown with two side pipes 22B for projecting shot perpendicular to the side surfaces 15 of this cavity 11. It also uses an anvil 22A cooperating with the two lateral pipes 22B.
- the lower cavity 11 is shown with a 9A shot blasting pipe terminated by a nozzle-shaped part 9B allowing projection without deviation of the flow of shot. It allows the treatment of the extreme surface 16 of the cavity 11.
- the projection nozzles 20, 21, 22 are temporarily mounted by screwing around the shot blasting pipe 9. This fixing can be protected by a sleeve 23.
- the means of shot propulsion consist of a device which propels it in one direction oriented coaxially to that of the interior of the shot blasting line 9.
- the shot is brought by a supply line 7 shown vertical and coaxial with the vertical axis 3 of the plate 2 of the shot blasting machine 1 of figure 1. It must then be projected horizontally from Figure 3. It therefore undergoes a change of direction which is located in a bend 24 inside a body 25.
- One of the two supply lines in compressed air 8, intended for propelling the shot, is shown on the right of the figure. It is brought parallel to the pipeline feed with shot 7, but ends with a 8A elbow opening at the elbow 24 of the body 25, in the extension of the internal pipe 26 placed at the outlet of the elbow 24.
- the compressed air projects the shot descending from the supply line 7 by elbow 24, in the direction of the pipe shot blasting 9, and this at high speed.
- the energy communicated by the gas under high pressure is entirely with shot, once it crossed the change of direction constituted mainly through the elbow 24 of the body 25. This energy is therefore fully communicated to the shot entering the shot-blasting line 9 terminated by the projection nozzle.
- the shot blasting line 9 is fixed on the body 25 by means of a sleeve 27.
- This fixing is preferably carried out by a bayonet system diagrammed by two nipples 28 fixed in this sleeve 27 and protruding in a groove 29 of line 9.
- the fixing the shot blasting pipe 9 requires the introduction of two grooves 29 each around a nipple 28 and the rotation of the pipe of shot peening 9 around its vertical axis until set in abutment of the assembly in a final position of fixation.
- the shot blasting line 9 is assembled and disassembled quickly and easily. This allows a quick change of shot blasting lines 9 for using shot blasting pipes of different lengths. Indeed, as illustrated in FIG. 2, the cavities 11 are relatively wide radially and require several radial positions of the projection nozzles, therefore several shot blasting pipes.
- the sleeve 27 is rotatably mounted on the support 25 by means of roller bearings 30.
- this pipe shot peening 9 is thus rotatably mounted.
- all projection nozzles can eject the shot in all directions around of the horizontal axis 33 of the pipeline of shot blasting 9.
- the rotational drive of the entire sleeve 27-shot blasting line 9-nozzle projection can be done by means of a third additional compressed pipe 31.
- the end output 31A of the latter is then positioned opposite the fins 32 of a turbine secured to the sleeve 27.
- Figure 5 makes it easier to explain these means for rotating the pipe of shot peening 9. Indeed, we find in this figure 5 the fins 32 of the turbine and the end 31A of the third compressed air line 31. We have also shown, for information only, the two first compressed air lines 8 bringing the shot propelling power.
- the output end 31A of the third compressed air line 31 is offset from to the axis of symmetry of the system and at the same time by relative to the axis of rotation 33 of the turbine.
- this is also the axis of rotation of the shot blasting line 9 and sleeve 27 of the figure 3.
- turbine rotation is opposite to the mounting direction of the shot-blasting pipe 9 in the sleeve 27. This avoids unexpected dismantling of the shot blasting lines 9 and ensuring their stay in this position.
- a screw pressure 34 can be used to act by screwing on the speed of rotation of the turbine. Indeed, this can be caused to rub against a surface radial 35 of the turbine. It is thus possible to block the rotation of the sleeve 27, in order to proceed with the assembly or disassembly of a pipeline shot blasting. It is also possible to use this adjusting screw 34 to vary the speed of turbine rotation.
- Installation required for the application of such a system preferably requires the use an additional air supply to blow the shot which accumulates inside the cavities treat. It is reported that it is also possible to vacuum it to proceed with this evacuation.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Cleaning In General (AREA)
- Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
Description
L'invention concerne le traitement mécanique par grenaillage de surfaces difficilement accessibles, par exemple des cavités internes d'un conteneur ou d'un objet à forme intérieure relativement complexe. L'invention s'applique plus particulièrement au traitement final de surfaces de l'intérieur d'un rotor de turboréacteur.The invention relates to treatment mechanical by blasting surfaces with difficulty accessible, for example internal cavities of a container or relatively shaped interior object complex. The invention applies more particularly to the final treatment of surfaces of the interior of a turbojet rotor.
Dans le cadre de fabrication des turboréacteurs pour aéronefs, il s'avère nécessaire de procéder à un grenaillage de précontrainte sur les surfaces intérieures du rotor. Un tel traitement de surfaces permet de renforcer les capacités mécaniques et de protection des surfaces en question.In the context of manufacturing turbojet engines for aircraft, it is necessary to perform a shot peening on the inner surfaces of the rotor. Such treatment of surfaces helps strengthen mechanical capabilities and protection of the surfaces in question.
Le grenaillage consiste à projeter à très grande vitesse des billes de métal d'un diamètre de l'ordre de 0,2 à 0,6 mm. Un tel martelage permet d'obtenir le traitement des surfaces attendu.Shot blasting consists of projecting very high speed metal balls with a diameter of in the range of 0.2 to 0.6 mm. Such hammering allows to obtain the expected surface treatment.
Le rotor d'un turboréacteur possède à l'intérieur un grand nombre de rainures radiales, appelées raidisseurs qui forment un grand nombre de cavités internes annulaires qu'il est également nécessaire de grenailler. La difficulté de mise en oeuvre de cette opération a obligé les constructeurs de turbomachines à concevoir de tels rotors en plusieurs parties, de manière à pouvoir avoir accès aux surfaces internes à traiter par grenaillage. Il s'ensuit un manque d'homogénéité structural du rotor. The rotor of a turbojet engine has inside a large number of radial grooves, called stiffeners which form a large number of annular internal cavities that it is also necessary to blast. The difficulty of setting work of this operation forced the builders to turbomachines to design such rotors in several parts, so that you can have access to the surfaces internal to be treated by shot blasting. It follows a lack of structural homogeneity of the rotor.
Le but principal de l'invention est de permettre la construction d'un rotor de turbomachine en une seule pièce tout en permettant le grenaillage de toutes les surfaces internes devant être traitées par ce procédé.The main object of the invention is to allow the construction of a turbomachine rotor by one piece while allowing the shot blasting of all internal surfaces to be treated by this process.
La technique de grenaillage consiste à projeter à très grande vitesse des billes métalliques au moyen d'une ou de plusieurs sources d'air comprimé à haute pression. Les billes sont ainsi véhiculées dans des canalisations aboutissant à une buse terminale de projection. Il est facile de comprendre que le moindre changement de direction sur le parcours du flux des billes propulsées à haute pression dans la canalisation constitue une importante perte de charge et de puissance. Le rendement de l'installation de grenaillage est donc tributaire de ce type d'embûches. Or, les cavités internes d'un rotor de turbomachine ne sont pas accessibles par une canalisation droite. En effet, elles ne sont d'ailleurs pas visibles. Elles ne sont accessibles que par le canal central du rotor sur lequel chacune de ces cavités débouche. En d'autres termes, les cavités internes d'un rotor de turbomachine ne sont pratiquement pas accessibles à un grenaillage de puissance suffisante.The shot blasting technique consists of project metal balls at very high speed by means of one or more compressed air sources at high pressure. The balls are thus transported in pipes leading to a terminal nozzle of projection. It is easy to understand that the slightest change of direction along the flow path high pressure propelled balls in the pipeline constitutes a significant pressure drop and power. The performance of the installation of shot peening is therefore dependent on this type of pitfall. However, the internal cavities of a turbomachine rotor do not are not accessible via a straight pipe. In indeed, they are not visible. They don't are accessible only through the central rotor channel on which each of these cavities opens. In others terms, the internal cavities of a turbomachine rotor are practically not accessible to shot blasting of sufficient power.
D'autre part, une installation de grenaillage à surpression comprend entre autres :
- un réservoir ou des moyens d'alimentation en grenaille ;
- des moyens de propulsion sous pression de cette grenaille, par exemple de l'air comprimé ;
- une ou plusieurs canalisations de grenaillage pour amener la grenaille sous pression vers une buse de projection ; et
- la buse de projection en question placée à l'extrémité de celle-ci.
- a tank or means for supplying shot;
- means for propelling this shot under pressure, for example compressed air;
- one or more shot blasting pipes for bringing the shot under pressure to a spray nozzle; and
- the projection nozzle in question placed at the end thereof.
La ou les canalisations de grenaillage doivent donc éviter de comporter des changements brutaux de direction. Il en est de même pour la buse de projection qu'on peut être amené à prévoir avec une surface de déviation, appelée enclume de projection, suivant la position et l'orientation des surfaces à traiter.The shot blasting line (s) should therefore avoid making changes brutal management. It is the same for the nozzle of projection that we may have to predict with a deflection surface, called projection anvil, depending on the position and orientation of the surfaces to treat.
L'objet principal de l'invention est un dispositif de grenaillage par projection de grenaille sous pression de surfaces non accessibles par une canalisation droite et nécessitant un changement brutal de direction pour le flux de grenaille, le dispositif comportant :
- une canalisation d'alimentation en grenaille ;
- des moyens de propulsion sous haute pression d'air comprimé de la grenaille connectés à la sortie de la canalisation d'alimentation ;
- au moins une canalisation de grenaillage pour amener la grenaille sous pression près des surfaces à grenailler et connectées au moyen de propulsion ; et
- une buse de projection placée à l'extrémité de la canalisation de grenaillage.
- a supply line for pellets;
- means for propelling compressed air under high pressure of the shot connected to the outlet of the supply pipe;
- at least one shot-blasting pipe for bringing the shot under pressure near the surfaces to be shot-blasted and connected by means of propulsion; and
- a projection nozzle placed at the end of the shot blasting pipe.
Selon invention, dans un tel dispositif
- la canalisation de grenaillage est rectiligne ;
- les moyens de propulsion comprennent deux canalisations d'air comprimé à haute pression débouchant de part et d'autre d'un coude qui reçoit à son entrée la canalisation d'alimentation, le changement brutal de direction du flux de grenaille étant assuré par ce coude avant la connexion avec les Canalisations d'air comprimé, de sorte que l'énergie de propulsion n'est communiquée à la grenaille qu'à l'entrée de la canalisation rectiligne de grenaillage débouchant sur la buse de projection, la fixation de la canalisation de grenaillage à la sortie des moyens de propulsion est obtenue par un manchon monté tournant dans un support des moyens de propulsion, des moyens d'entraínement en rotation étant utilisés pour faire tourner le manchon autour d'un axe de rotation coaxial avec celui de la canalisation de grenaillage, ces moyens d'entraínement en rotation du manchon comprenant une turbine à ailettes d'axe vertical de rotation et fixée sur le manchon et une troisième canalisation d'air comprimé à haute pression débouchant tangentiellement par rapport à l'axe de rotation de la turbine, en regard des ailettes de celle-ci pour faire tourner la canalisation de grenaillage et la buse de projection dans le sens de rotation opposé au sens de fixation du manchon.
- the shot blasting pipe is straight;
- the propulsion means comprise two pipes of compressed air at high pressure emerging on either side of an elbow which receives at its inlet the supply line, the abrupt change of direction of the flow of shot being ensured by this elbow before connection with the compressed air lines, so that the propelling energy is communicated to the shot only at the entrance to the straight shot-blasting pipe leading to the projection nozzle, the fixing of the pipe shot peening at the outlet of the propulsion means is obtained by a sleeve mounted rotating in a support of the propulsion means, rotational drive means being used to rotate the sleeve around an axis of rotation coaxial with that of the shot blasting pipe, these means for driving the sleeve in rotation comprising a turbine with fins with a vertical axis of rotation and fixed to the sleeve and a third ca nalisation of compressed air at high pressure opening tangentially with respect to the axis of rotation of the turbine, opposite the fins thereof to rotate the blasting pipe and the spray nozzle in the direction of rotation opposite to the direction sleeve fixing.
Dans le but de faciliter le montage du dispositif, la fixation de la canalisation de grenaillage à la sortie des moyens de propulsion est obtenue sur le manchon par un dispositif de fixation à baïonnette verrouillable et déverrouillable, pour permettre le démontage rapide de cette canalisation.In order to facilitate the mounting of the device, the fixing of the shot blasting pipe at the outlet of means of propulsion is obtained on the sleeve by a lockable bayonet mount and unlockable, to allow rapid disassembly of this pipeline.
La buse est fixée de façon temporaire par vissage, pour pouvoir être changée à volonté en fonction de l'orientation des surfaces à grenailler.The nozzle is temporarily fixed by screwing, to can be changed at will depending on the orientation surfaces to be shot blasted.
Le dispositif peut se compléter avantageusement d'une vis de pression pour ralentir ou bloquer la rotation de la turbine. De préférence, les deux premières et la troisième canalisations en air comprimé sont maintenues sensiblement parallèles jusqu'au moyen de propulsion au moyen d'au moins une colonne rigide.The device can advantageously be supplemented by a pressure screw to slow down or block rotation of the turbine. Preferably, the first two and the third compressed air line are kept substantially parallel until the means propulsion by means of at least one rigid column.
Dans le cadre de l'application d'un tel dispositif au grenaillage des cavités internes d'une pièce imposante et volumineuse telle qu'un rotor de turboréacteur, le dispositif selon l'invention comprend un pied fixé sur un axe de déplacement solidaire d'une grenailleuse sur le plateau rotatif horizontal de laquelle la pièce à grenailler est fixée pour que la canalisation de grenaillage se trouve horizontalement introduite dans un espace interne torique du rotor de turbomachine à grenailler.In the context of the application of such device for blasting the internal cavities of a large and bulky piece such as a rotor turbojet engine, the device according to the invention comprises a foot fixed on a displacement axis integral with a shot blasting machine on the horizontal turntable which the workpiece is fixed so that the shot blasting pipe is located horizontally introduced into an internal toric space of the rotor shot blasting machine.
L'invention et ses différentes caractéristiques techniques seront mieux comprises à la lecture de la description suivante, annexée de quelques figures représentant respectivement :
- figure 1, en coupe frontale, le dispositif selon l'invention installé sur une grenailleuse pour le grenaillage d'un rotor de turboréacteur ;
- figure 2, en coupe, l'utilisation de plusieurs buses différentes avec le dispositif selon l'invention dont l'application est représentée à la figure 1 ;
- figure 3, en coupe, les moyens de propulsion du dispositif selon l'invention ;
- figure 4, en coupe partielle latérale, un détail des moyens de propulsion du dispositif selon l'invention ; et
- figure 5, en vue de dessus, les moyens d'entraínement en rotation dans le dispositif selon l'invention.
- Figure 1, in front section, the device according to the invention installed on a shot blasting machine for the blasting of a turbojet rotor;
- Figure 2, in section, the use of several different nozzles with the device according to the invention whose application is shown in Figure 1;
- Figure 3, in section, the propulsion means of the device according to the invention;
- Figure 4, in partial side section, a detail of the propulsion means of the device according to the invention; and
- Figure 5, in top view, the rotary drive means in the device according to the invention.
La figure 1 montre un rotor 10 de
turboréacteur monté sur le plateau rotatif horizontal 2
d'une grenailleuse 1. Ce rotor 10 est donc animé d'un
mouvement de rotation autour d'un axe vertical 3 de la
grenailleuse dans le but de faire subir à toutes les
surfaces internes du rotor 10 le traitement de
grenaillage. En effet, on distingue, sur cette figure
1, des nervures radiales 12 se trouvant positionnées
horizontalement à l'intérieur du rotor 10. Elles
constituent des raidisseurs nécessaires pour la tenue
mécanique du rotor 10. Elles délimitent des cavités
intérieures 11 dont les parois sont donc à grenailler.
On constate que ces cavités 11 sont inaccessibles
directement et que n'importe quel élément devant
travailler à l'intérieur de celles-ci doit former un
coude pour pouvoir y avoir accès.Figure 1 shows a
A cet effet, le dispositif de grenaillage
est équipé d'un pied 4 soutenant une
potence horizontale 5. Ce pied 4 est fixé sur un axe de
déplacement 4A de la grenailleuse 1. Il permet
d'installer le système de grenaillage coaxialement à
l'axe vertical 3 de la grenailleuse 1.To this end, the shot blasting device
is equipped with a
Le système selon l'invention a été
symbolisé par une colonne verticale 6, fixée à la
potence 5 et à l'intérieur de laquelle sont introduites
des canalisations d'alimentation du dispositif de
grenaillage. Une première canalisation d'alimentation
en grenaille 7 est représentée, ainsi qu'une des
canalisations d'alimentation en air comprimé 8.The system according to the invention has been
symbolized by a
La partie opérationnelle du dispositif de
grenaillage selon l'invention est symbolisée par
l'extrémité inférieure de la colonne 6 supportant une
canalisation de grenaillage 9 dirigée vers l'intérieur
d'une cavité 11. On comprend qu'une rotation du plateau
horizontal 2 portant le rotor 10 par rapport à cette
canalisation de grenaillage 9 autour de l'axe vertical
3 permet de projeter à l'intérieur d'une cavité 11 le
grenaillage sur 360° et de traiter ainsi une telle
cavité 11 annulaire complète, un mouvement
supplémentaire de rotation de la canalisation de
grenaillage 9 autour de son axe horizontal étant
adjoint, comme cela est précisé plus loin.The operational part of the
shot blasting according to the invention is symbolized by
the lower end of
En référence à la figure 2, qui est une
demi-coupe du rotor 10 de la figure 1, différentes
buses de projection de grenaille sont utilisées. En
effet, compte tenu du fait que chaque cavité 11 a une
forme interne particulière et constituée de nombreuses
surfaces, il s'avère indispensable d'utiliser des buses
de projection différentes. Dans la cavité supérieure
11, une première buse 20 est utilisée pour projeter de
la grenaille dans les coins 13 éloignés de l'axe 3.
Cette première buse 20 possède une enclume 20A équipée
d'une surface inclinée pour dévier le jet de grenaille,
en coopération avec une canalisation 20B inclinée de
cette même buse 20.Referring to Figure 2, which is a
half-section of the
De même, dans la deuxième cavité 11, une
deuxième enclume 21 a été représentée montée sur la
canalisation de grenaillage 9 pour traiter les coins
rapprochés de l'axe 3 de la cavité 11. Pour cela, une
enclume 21A, différente de la première 20A, est
utilisée. En effet, elle possède une surface convexe
permettant de refouler la grenaille vers les coins 14
au moyen d'au moins une canalisation inclinée 20B en
direction de ces coins 14 rapprochés de l'axe 3. On
précise que le rendement d'une telle enclume est
inférieur à celui de la précédente, compte tenu du fait
du changement brutal accentué de direction du flux de
grenaille, consommant d'ailleurs une grande énergie. Similarly, in the
Dans la troisième cavité 11, une troisième
buse de projection 22 a été représentée avec deux
canalisations latérales 22B pour projeter de la
grenaille perpendiculairement aux surfaces latérales 15
de cette cavité 11. Elle utilise d'ailleurs une enclume
22A coopérant avec les deux canalisations latérales
22B.In the
La position extrême de cette troisième buse
de projection 22, symbolisée au moyen de traits mixtes,
schématise l'utilisation de canalisations de
grenaillage 9 de longueurs différentes pour permettre
la projection de grenaille sur toute la surface interne
latérale 15 des cavités 11.The extreme position of this
La cavité inférieure 11 est représentée
avec une canalisation de grenaillage 9A terminée par
une partie en forme de buse 9B permettant la projection
sans déviation du flux de grenaille. Elle permet le
traitement de la surface extrême 16 de la cavité 11.The
Les buses de projection 20, 21, 22 sont
montées de manière temporaire par vissage autour de la
canalisation de grenaillage 9. Cette fixation peut être
protégée par un manchon 23.The projection nozzles 20, 21, 22 are
temporarily mounted by screwing around the
En référence à la figure 3, les moyens de
propulsion de la grenaille sont constitués d'un
dispositif qui propulse celle-ci dans une direction
orientée coaxialement à celle de l'intérieur de la
canalisation de grenaillage 9.Referring to Figure 3, the means of
shot propulsion consist of a
device which propels it in one direction
oriented coaxially to that of the interior of the
En effet, la grenaille est amenée par une
canalisation d'alimentation 7 représentée verticale et
coaxiale à l'axe vertical 3 du plateau 2 de la
grenailleuse 1 de la figure 1. Elle doit être ensuite
projetée horizontalement par rapport à la figure 3.
Elle subit en conséquence un changement de direction
qui est situé dans un coude 24 à l'intérieur d'un corps
25. Indeed, the shot is brought by a
Une des deux canalisations d'alimentation
en air comprimé 8, destinée à la propulsion de la
grenaille, est représentée sur la droite de la figure.
Elle est amenée de façon parallèle à la canalisation
d'alimentation en grenaille 7, mais se termine par un
coude 8A débouchant au niveau du coude 24 du corps 25,
dans le prolongement de la canalisation interne 26
placée à la sortie du coude 24.One of the two supply lines
in
De ce fait, l'air comprimé projette la
grenaille descendant de la canalisation d'alimentation
7 par le coude 24, dans la direction de la canalisation
de grenaillage 9, et ceci à grande vitesse. De cette
façon, l'énergie communiquée par le gaz sous haute
pression l'est entièrement à la grenaille, une fois que
celle-ci a franchi le changement de direction constitué
principalement par le coude 24 du corps 25. Cette
énergie est donc communiquée totalement à la grenaille
pénétrant dans la canalisation de grenaillage 9
terminée par la buse de projection.As a result, the compressed air projects the
shot descending from the
L'arrivée de l'air comprimé de propulsion à
la sortie du coude 24 est également explicitée grâce à
la figure 4 montrant en coupe transversale ces organes.
Deux canalisations 8 d'alimentation en air comprimé
haute pression ont été représentées. Leur cheminement
est parallèle à la colonne 6 de la figure 3. Ils se
rejoignent à l'intérieur du support 25 au niveau de la
sortie du coude 24. La grenaille est donc prise à la
fois par en-dessous et de chaque côté par l'énergie de
propulsion de l'air comprimé à haute pression. Elle est
ainsi envoyée dans la canalisation interne 26 du
manchon 27, puis dans la canalisation de grenaillage 9.The arrival of propelled compressed air at
the exit from the
La canalisation de grenaillage 9 est fixée
sur le corps 25 par l'intermédiaire d'un manchon 27.
Cette fixation est effectuée de préférence par un
système à baïonnette schématisé par deux tétons 28
fixés dans ce manchon 27 et dépassant dans une rainure
29 de la canalisation 9. En d'autres termes, la
fixation de la canalisation de grenaillage 9 nécessite
l'introduction de deux rainures 29 chacune autour d'un
téton 28 et la rotation de la canalisation de
grenaillage 9 autour de son axe vertical jusqu'à mise
en butée de l'ensemble dans une position finale de
fixation.The
Ainsi, la canalisation de grenaillage 9 est
montée et démontée de manière rapide et aisée. Ceci
permet de procéder à un changement rapide de
canalisations de grenaillage 9 pour utiliser des
canalisations de grenaillage de longueurs différentes.
En effet, comme l'illustre la figure 2, les cavités 11
sont relativement larges radialement et nécessitent
plusieurs positions radiales des buses de projection,
donc plusieurs canalisations de grenaillage.Thus, the
Comme le montre la figure 3, le manchon 27
est monté tournant sur le support 25 au moyen de
paliers à roulements 30. De ce fait, cette canalisation
de grenaillage 9 est ainsi montée tournante. En
conséquence, toutes les buses de projection peuvent
éjecter la grenaille dans toutes les directions autour
de l'axe horizontal 33 de la canalisation de
grenaillage 9.As shown in Figure 3, the
L'entraínement en rotation de l'ensemble du
manchon 27-canalisation de grenaillage 9-buse de
projection peut se faire au moyen d'une troisième
canalisation supplémentaire comprimée 31. L'extrémité
de sortie 31A de cette dernière est alors positionnée
en regard des ailettes 32 d'une turbine solidaire du
manchon 27.The rotational drive of the entire
sleeve 27-shot blasting line 9-nozzle
projection can be done by means of a third
additional compressed
La figure 5 permet mieux d'expliciter ces
moyens de mise en rotation de la canalisation de
grenaillage 9. En effet, on retrouve sur cette figure 5
les ailettes 32 de la turbine et l'extrémité 31A de la
troisième canalisation d'air comprimé 31. On a
également représenté, à titre indicatif, les deux
premières canalisations d'air comprimé 8 amenant la
puissance de propulsion à la grenaille.Figure 5 makes it easier to explain these
means for rotating the pipe of
shot peening 9. Indeed, we find in this figure 5
the
L'extrémité de sortie 31A de la troisième
canalisation d'air comprimé 31 est décalée par rapport
à l'axe de symétrie du système et en même temps par
rapport à l'axe de rotation 33 de la turbine. On note
que celui-ci est également l'axe de rotation de la
canalisation de grenaillage 9 et du manchon 27 de la
figure 3. Il faut également préciser que le sens de
rotation de la turbine est opposé au sens de montage de
la canalisation de grenaillage 9 dans le manchon 27.
Ceci permet d'éviter un démontage inopiné des
canalisations de grenaillage 9 et d'assurer leur
maintien dans cette position.The
Sur la figure 5 a également été représentée
la colonne 6 servant au maintien des canalisations
d'alimentation 8, 31.In Figure 5 has also been shown
En revenant à la figure 3, une vis de
pression 34 peut être utilisée pour agir par vissage
sur la vitesse de rotation de la turbine. En effet,
celle-ci peut être amenée à frotter contre une surface
radiale 35 de la turbine. Il est ainsi possible de
bloquer la rotation du manchon 27, dans le but de
procéder au montage ou au démontage d'une canalisation
de grenaillage. Il est également possible d'utiliser
cette vis de réglage 34 pour faire varier la vitesse de
rotation de la turbine.Returning to Figure 3, a
L'installation nécessaire à l'application d'un tel système nécessite de préférence l'utilisation d'une arrivée d'air supplémentaire pour souffler la grenaille qui s'accumule à l'intérieur des cavités à traiter. On signale qu'il est d'ailleurs possible d'aspirer celle-ci pour procéder à cette évacuation.Installation required for the application of such a system preferably requires the use an additional air supply to blow the shot which accumulates inside the cavities treat. It is reported that it is also possible to vacuum it to proceed with this evacuation.
Le traitement par grenaillage de toutes les surfaces intérieures d'un rotor de turboréacteur fabriqué d'une seule pièce est ainsi possible grâce à l'utilisation d'une grenailleuse à plateau rotatif horizontal et du dispositif selon l'invention. En outre, un grand nombre de changement de canalisations de grenaillage 9 de longueurs différentes et l'utilisation de buses de projection différentes sont nécessaires pour l'usinage d'un seul rotor. Toutefois, le temps gagné pour effectuer ce travail, la qualité de traitement de surfaces obtenue et la structure mécanique homogène du rotor fabriqué en une seule pièce, constituent des avantages considérables par rapport aux méthodes précédentes de fabrication de tels rotors de turboréacteurs.The shot blasting treatment of all inner surfaces of a turbojet rotor made in one piece is thus possible thanks to the use of a rotary table blaster horizontal and of the device according to the invention. In in addition, a large number of pipe changes shot peening 9 of different lengths and the use of different projection nozzles are necessary for machining a single rotor. However, the time saved to perform this work, the quality of surface treatment obtained and the structure homogeneous mechanical rotor made in one piece, constitute considerable advantages by compared to previous methods of making such turbojet rotors.
Claims (6)
- An apparatus for pressure shotblasting surfaces which are not directly accessible and require the shot flow to undergo an abrupt change of direction, comprising:a shot feed duct (7);high pressure compressed air propulsion means (8) secured to the exit of the shot feed duct (7);a shotblasting duct (9) to carry pressurised shot to surfaces (13, 14, 15, 16) to be shotblasted, said duct being secured to the propulsion means, anda blasting nozzle (20 ,21, 22) disposed at the end of the blasting duct (9);
characterised in thatthe blasting duct (9) is straight;the propulsion means comprise first and second high pressure compressed air lines (8) opening into either side of a bend (24) at the exit thereof, the bend receiving at its entry the shot feed duct (7), the abrupt change of shot flow direction occurring in the bend (24) before the connection to the high pressure air feed lines (8) so that the propulsive energy is imparted to the shot only at the entry of the straight blasting duct (9) which opens directly into the blasting nozzle (20, 21, 22), andthe blasting duct (9) is secured to the exit of the propulsion means by a sleeve (27) rotatably mounted in a support (25) of the propulsion means, rotation-producing means 31, 32) being used to rotate the sleeve (27) around a rotational axis (33) coaxial to the rotational axis of the blasting duct (9), the rotation-producing means comprising a turbine which has blades (32), has the axis (33) as its axis of rotation and is secured to the sleeve (27), and a third high pressure compressed air line (31) opening tangentially to the turbine rotational axis opposite the turbine blades (32) to rotate the blasting duct (9) and the blasting nozzle (20, 21,22) in a direction opposite to the direction of securing of the sleeve. - An apparatus according to claim 1, characterised in that the blasting duct (9) is connected to the exit of the propulsion means on the sleeve (27) by way of a bayonet connection (28, 29) which can be locked and unlocked to facilitate rapid release of the blasting duct (9).
- An apparatus according to claim 1, characterised in that the blasting nozzle (20, 21, 22) is screwed to the blasting duct (9) releasably to facilitate rapid as-required changing.
- An apparatus according to claim 1, characterised in that a pressure screw (34) is used to slow down or stop the turbine..
- An apparatus according to claim 1, characterised in that the shot feed duct (7) and the first, second and third high pressure compressed air lines (8, 31) are maintained substantially parallel to one another as far as the propulsion means by means of a rigid column (6).
- An apparatus according to claim 5, characterised in that it comprises a foot (4) secured to a shaft (4A) for moving a shotblasting device (1) having a horizontal rotating plate (2) carrying a turbojet engine rotor (10) to be shotblasted to ensure that the blasting duct (9) is disposed horizontally and can be introduced into an internal toroidal cavity (11) of the rotor (10).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9315390 | 1993-12-22 | ||
FR9315390A FR2713974B1 (en) | 1993-12-22 | 1993-12-22 | Shot peening device for surfaces not accessible by a straight pipe. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0659523A1 EP0659523A1 (en) | 1995-06-28 |
EP0659523B1 true EP0659523B1 (en) | 1999-02-17 |
Family
ID=9454179
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94402963A Expired - Lifetime EP0659523B1 (en) | 1993-12-22 | 1994-12-21 | Apparatus for sandblasting surfaces, which are not directly accessible |
Country Status (9)
Country | Link |
---|---|
US (1) | US5499519A (en) |
EP (1) | EP0659523B1 (en) |
JP (1) | JP2732517B2 (en) |
CA (1) | CA2138612A1 (en) |
DE (1) | DE69416578T2 (en) |
ES (1) | ES2127903T3 (en) |
FR (1) | FR2713974B1 (en) |
GR (1) | GR3029908T3 (en) |
IL (1) | IL112078A (en) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2129289B1 (en) * | 1995-07-12 | 2000-02-16 | Agullo Ing | DEVICE FOR WASHING AND / OR DEBURRING WITH PRECISION OF MACHINED PARTS HOLES. |
EP0935958B1 (en) * | 1998-02-17 | 2004-03-31 | SWISS CAPS Rechte und Lizenzen AG | Forming roll and method for machining forming rolls |
FR2816537B1 (en) * | 2000-11-16 | 2003-01-17 | Snecma Moteurs | METHOD AND INSTALLATION FOR ULTRASONIC SCRATCHING OF ANNULAR AUB ATTACHES ALVEOLES ON A ROTOR |
FR2816536B1 (en) * | 2000-11-16 | 2003-01-17 | Snecma Moteurs | METHOD AND DEVICE FOR ULTRASONIC SCRATCHING OF "AXIAL" ATTACHMENT ALVEOLS OF AUBES ON A ROTOR |
FR2816538B1 (en) * | 2000-11-16 | 2003-01-17 | Snecma Moteurs | PROCESS FOR INCREASING THE LIFETIME OF AUB ATTACHES ON A ROTOR |
DE10143736C1 (en) * | 2001-09-06 | 2002-08-22 | Siemens Ag | Method for producing a high-pressure fuel accumulator |
EP1555329A1 (en) * | 2004-01-15 | 2005-07-20 | Siemens Aktiengesellschaft | Workpiece with internal compressive stresses, method and apparatus for producing internal compressive stresses |
DE202005018108U1 (en) | 2005-11-19 | 2006-01-12 | Hammelmann Maschinenfabrik Gmbh | nozzle head |
EP1941967A1 (en) * | 2007-01-08 | 2008-07-09 | ALSTOM Technology Ltd | Method and device for pin removal in a confined space |
US8186419B2 (en) | 2008-07-08 | 2012-05-29 | GM Global Technology Operations LLC | Method and system for internal cleaning of complex castings |
US10062460B2 (en) * | 2014-11-26 | 2018-08-28 | Framatome Inc. | Control rod device mechanism inner diameter annulus ultra high pressure cavitation peening |
DE102019201656A1 (en) | 2019-02-08 | 2020-08-13 | MTU Aero Engines AG | METHOD OF SMOOTHING A SURFACE OF A COMPONENT |
CN111775064B (en) * | 2020-06-23 | 2022-03-22 | 欧盟 | Pneumatic type numerical control shot blasting machine |
CN111823146B (en) * | 2020-07-16 | 2023-02-07 | 芜湖乐维汽车装备设计有限公司 | Shot blasting frame for metal safety frame of automobile |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3419894A (en) * | 1966-04-01 | 1968-12-31 | Metal Improvement Company | Peening nozzle |
US3402583A (en) * | 1966-06-22 | 1968-09-24 | Metal Improvement Company | Universally adjustable peening structure |
US3545996A (en) * | 1969-02-25 | 1970-12-08 | Zero Manufacturing Co | Method and apparatus for producing a decorative effect on stainless steel and other surface |
SU642058A1 (en) * | 1976-02-18 | 1979-01-15 | Petrosov Vladimir V | Line for manufacturing bodies of revolution |
US4084357A (en) * | 1977-04-22 | 1978-04-18 | Peterson Machine Tool, Inc. | Valve cleaning machine |
GB2159069A (en) * | 1984-05-17 | 1985-11-27 | John Link | Blasting nozzle |
JPS62176768A (en) * | 1986-01-29 | 1987-08-03 | Takachiho Kagaku Kogyo Kk | Inner surface cleaning apparatus for cylinder |
JPH0529816Y2 (en) * | 1987-12-17 | 1993-07-29 | ||
JPH01129063U (en) * | 1988-02-29 | 1989-09-04 | ||
US5018320A (en) * | 1989-02-09 | 1991-05-28 | Michael Anguelo | Stripper assembly for combustion chambers of turbine or jet engines |
DE3939888C1 (en) * | 1989-11-30 | 1991-01-10 | Mannesmann Ag, 4000 Duesseldorf, De | |
US5204826A (en) * | 1991-02-01 | 1993-04-20 | General Electric Company | Quality assurance of surface treatments by analysis of substrate surface line traces |
DE9207924U1 (en) * | 1992-06-12 | 1992-09-03 | Pocanschi, Adrian, Dr.-Ing., 7000 Stuttgart | Sealing connection |
US5367762A (en) * | 1992-12-23 | 1994-11-29 | Advanced Micro Devices, Inc. | Decapping machine for packaged integrated circuits |
-
1993
- 1993-12-22 FR FR9315390A patent/FR2713974B1/en not_active Expired - Fee Related
-
1994
- 1994-12-20 IL IL11207894A patent/IL112078A/en not_active IP Right Cessation
- 1994-12-20 CA CA002138612A patent/CA2138612A1/en not_active Abandoned
- 1994-12-21 US US08/360,290 patent/US5499519A/en not_active Expired - Fee Related
- 1994-12-21 EP EP94402963A patent/EP0659523B1/en not_active Expired - Lifetime
- 1994-12-21 DE DE69416578T patent/DE69416578T2/en not_active Expired - Fee Related
- 1994-12-21 ES ES94402963T patent/ES2127903T3/en not_active Expired - Lifetime
- 1994-12-22 JP JP6336473A patent/JP2732517B2/en not_active Expired - Fee Related
-
1999
- 1999-04-07 GR GR990400999T patent/GR3029908T3/en unknown
Also Published As
Publication number | Publication date |
---|---|
CA2138612A1 (en) | 1995-06-23 |
JPH07251376A (en) | 1995-10-03 |
DE69416578D1 (en) | 1999-03-25 |
FR2713974B1 (en) | 1996-01-19 |
IL112078A (en) | 1997-08-14 |
GR3029908T3 (en) | 1999-07-30 |
JP2732517B2 (en) | 1998-03-30 |
DE69416578T2 (en) | 2000-01-05 |
EP0659523A1 (en) | 1995-06-28 |
FR2713974A1 (en) | 1995-06-23 |
US5499519A (en) | 1996-03-19 |
IL112078A0 (en) | 1995-03-15 |
ES2127903T3 (en) | 1999-05-01 |
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