EP1101827B1 - Process for ultrasonic shotpeening large annular surfaces of thinwalled workpieces - Google Patents
Process for ultrasonic shotpeening large annular surfaces of thinwalled workpieces Download PDFInfo
- Publication number
- EP1101827B1 EP1101827B1 EP00403183A EP00403183A EP1101827B1 EP 1101827 B1 EP1101827 B1 EP 1101827B1 EP 00403183 A EP00403183 A EP 00403183A EP 00403183 A EP00403183 A EP 00403183A EP 1101827 B1 EP1101827 B1 EP 1101827B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- opening
- shot blasting
- enclosure
- microbeads
- shot
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C5/00—Devices or accessories for generating abrasive blasts
- B24C5/005—Vibratory devices, e.g. for generating abrasive blasts by ultrasonic vibrations
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- 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
- B24C1/10—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for compacting surfaces, e.g. shot-peening
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
- C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
- C21D7/06—Modifying the physical properties of iron or steel by deformation by cold working of the surface by shot-peening or the like
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/04—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering with simultaneous application of supersonic waves, magnetic or electric fields
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/47—Burnishing
- Y10T29/479—Burnishing by shot peening or blasting
Definitions
- the invention relates to a method of ultrasonic shot blasting using a mist of microbeads inside an enclosure and more particularly to a shot blasting of large annular surfaces on parts thin.
- microbeads are commonly rolling bearing balls. They are usually ceramic or steel with a diameter of 0.2mm to 4mm. The shot peening is carried out inside a closed cabin using powered nozzles simultaneously with compressed gas and microbeads, the compressed gas ensuring the propulsion of microbeads.
- the patent FR.2,689,431 discloses a method of blasting said improperly “by ultrasound “consisting of maintaining a” fog "of microbeads inside a pregnant, the interview being carried out using a vibrator acting at frequencies of the order of 20 KH, the enclosure being open, the part being applied against the opening of the enclosure, shot blasting being ensured by the impacts of the microbeads on the part, the enclosure and the room being animated by a relative movement aiming at passing the enclosure on the entire surface of the piece to be blasted.
- the patent also shows how shot blast circular parts such as trees.
- fog is used by analogy with fogs formed of tiny droplets of water. Indeed, in the process of ultrasonic shot blasting, the microbeads are animated with random speeds in modulus and direction, which makes them ricochet between them, against the walls of the enclosure and against the surface of the room in contact with the mist of microbeads.
- This patent gives examples of massive pieces able to resume without distort the stresses resulting from shot blasting.
- this process does not allow to blast thin circular pieces, because they start to deform very early during shot blasting even. Even if the surface is uniformly blasted, these deformations are only partially absorbed at the end of shot blasting because the stress is achieved by the plastic and non-linear deformation of the material.
- the process requires that shot blasting be stopped accurately when the piece has made a turn if you want to get a uniform shot blasting. Indeed, a late stop shot blasting produce a localized excess of shot blasting on a lap premature will produce a localized lack of shot blasting that will be difficult to complete without causing excessive blasting just next door.
- a first problem to solve is to blast without deforming the thin parts and the dimensions of which are greater than those of the shot blasting chamber.
- a second problem to be solved is to guarantee uniform shot blasting over the entire surface to be blasted.
- the invention proposes a method of ultrasonic blasting of annular surfaces of large dimensions on thin pieces, said method of passing the surface to be shot-blasted in front of the opening of a blasting chamber, said enclosure containing a "mist" of microbeads maintained by a vibrator inside the enclosure, said microbeads impinging the portion of the surface to be blasted presented in front of the opening, said impacts causing shot blasting, said enclosure and said part being driven by a relative rotational movement to make the whole of the surface to be blasted in front of the opening of the enclosure during shot blasting.
- shotblasting is done in N passes in front of the opening of the enclosure, each point of the shot-blasting surface passing N times before the opening of the enclosure, each passage providing a fraction substantially equal to 1 / N of total shot blasting to be done.
- N 5 revolutions. This result will obviously be better with a higher number of revolutions, for example 20 or 100. A large number N is needed for shot blasting very thin.
- An advantage of the method is to allow to allow a large shot blasting and pushed to optimal on thin parts without deforming them, since during all shot peening, the stresses imposed on the part remain uniform.
- Part 1 is a training cone on a turbine engine for aircraft.
- Part 1 consists of a thin wall and has a shape circle of revolution around a geometric axis 2.
- Part 1 has a barrel 3 truncated cone whose end of larger diameter is extended radially by a flange 4, said flange 4 itself having a bearing surface 5 to be blasted, said bearing surface 5 being annular, flat and radial.
- An enclosure 10 is used inside which is maintained a fog of microbeads 11, said enclosure being delimited laterally by a wall 12, said enclosure having an opening 13 whose edges are referenced 14.
- a vibrator 20 constituted by a sonotrode 21 resonated by one its ends by a vibration generator 22 which is usually quartz, the other end of the sonotrode 21 having a vibrating surface 23 and substantially plane, said vibrating surface 23 being placed at the bottom of the enclosure 10 and being opposite of the opening 13.
- the vibration generator 22 puts in longitudinal resonance the sonotrode 21.
- the vibrating surface 23 thus excited transmits energy to the microbeads which bounce on the surface to be blasted 5 opposite the opening 13 and on the walls of the chamber 12, said microbeads then gradually losing energy, said microbeads also arriving on the vibrating surface 23 which gives them a new energy.
- the microbeads move inside the enclosure at speeds random in size and direction, these microbeads thus forming a real "fog" of microbeads inside the enclosure 10.
- An advantage of the method is that the shot peening is carried out without contact between the piece 1 and the enclosure 10, which avoids any degradation of the surface of the room.
- the microbeads are retained inside the enclosure 10 because the game E is less than the diameter of said microbeads.
- This arrangement also has the advantage of avoiding the use of wear pads on the enclosure 10
- T To x ⁇ x D / L in which To is the duration of exposure to shot blasting of each element of the surface to be shot blasted 5, D is the average diameter of said surface 5 and L is the width of the enclosure 10 taken tangentially to the displacement of said surface 5 in front of the opening 13, that is to say perpendicular to the plane of the single figure.
- the edges 14 of the enclosure 10 will be given a shape complementary to said surface, in order to maintain the game E.
Description
L'invention se rapporte à un procédé de grenaillage dit "par ultrasons" mettant en oeuvre un brouillard de microbilles à l'intérieur d'une enceinte et plus particulièrement à un procédé de grenaillage de surfaces annulaires de grandes dimensions sur des pièces minces.The invention relates to a method of ultrasonic shot blasting using a mist of microbeads inside an enclosure and more particularly to a shot blasting of large annular surfaces on parts thin.
Il est connu de grenailler la surface de pièces métalliques par projection de microbilles. En impactant la surface de la pièce avec un angle d'incidence faible par rapport à la perpendiculaire à cette surface et avec une énergie cinétique suffisante, les microbilles provoquent une mise en compression permanente de la surface sur une faible épaisseur. Cette mise en compression s'oppose à l'apparition et à la progression des fissures à la surface de la pièce et permet ainsi d'en améliorer la résistance à la fatigue. Les microbilles sont couramment des billes de palliers à roulement. Elles sont habituellement en céramique ou en acier avec un diamètre de 0,2mm à 4mm. Le grenaillage est effectué à l'intérieur d'une cabine fermée à l'aide de buses alimentées simultanément en gaz comprimé et en microbilles, le gaz comprimé assurant la propulsion des microbilles.It is known to blast the surface of metal parts by spraying microbeads. By impacting the surface of the workpiece with a low angle of incidence relative to the perpendicular to this surface and with sufficient kinetic energy, microbeads cause a permanent compression of the surface on a weak thickness. This compression is opposed to the appearance and progression of cracks on the surface of the part and thus improves the fatigue resistance. Microbeads are commonly rolling bearing balls. They are usually ceramic or steel with a diameter of 0.2mm to 4mm. The shot peening is carried out inside a closed cabin using powered nozzles simultaneously with compressed gas and microbeads, the compressed gas ensuring the propulsion of microbeads.
On produit en aéronautique des pièces minces et de grandes dimensions dont le grenaillage pose quelques difficultés :
- Les grandes pièces exigent de grandes cabines,
- Le grenaillage est souvent léger pour ne pas déformer les pièces minces. Celles-ci en effet ne peuvent pas reprendre sans se déformer les sollicitations provoquées par les contraintes de compression résultant d'un grenaillage important, cette compression s'étendant alors en profondeur sous la surface grenaillée.
- L'exposition de la pièce au grenaillage passe par un optimum qui donne à cette pièce la meilleure résistance. Un tel grenaillage est cependant difficile à assurer car les buses de grenaillage sont délicates à régler et ne sont pas stables. Ainsi, un grenaillage insuffisant ne donne pas la résistance prévue, mais il est encore possible d'atteindre l'optimum en effectuant un grenaillage complémentaire. Au contraire, un grenaillage excessif provoque une dégradation superficielle irrécupérable de la pièce avec un abaissement de sa résistance.
- Large rooms require large cabins,
- Shot peening is often light so as not to deform the thin parts. These can indeed not resume without deforming the stresses caused by the compressive stresses resulting from heavy shot blasting, this compression then extending deep below the blasted surface.
- The exposure of the piece to shot blasting passes through an optimum that gives this piece the best resistance. Such shot peening is however difficult to ensure because the shot blast nozzles are difficult to adjust and are not stable. Thus, insufficient shot blasting does not give the expected resistance, but it is still possible to achieve the optimum by performing a complementary shot blasting. On the contrary, excessive blasting causes irreparable superficial degradation of the part with a lowering of its resistance.
On connaít par le brevet FR.2.689.431 un procédé de grenaillage dit improprement "par ultrasons" consistant à entretenir un "brouillard" de microbilles à l'intérieur d'une enceinte, l'entretien étant réalisé à l'aide d'un vibrateur agissant à des fréquences de l'ordre de 20 KH, l'enceinte étant ouverte, la pièce étant appliquée contre l'ouverture de l'enceinte, le grenaillage étant assuré par les impacts des microbilles sur la pièce, l'enceinte et la pièce étant animés d'un mouvement relatif visant à faire passer l'enceinte sur toute la surface de la pièce à grenailler. Le brevet montre aussi comment grenailler des pièces circulaires telles des arbres.The patent FR.2,689,431 discloses a method of blasting said improperly "by ultrasound "consisting of maintaining a" fog "of microbeads inside a pregnant, the interview being carried out using a vibrator acting at frequencies of the order of 20 KH, the enclosure being open, the part being applied against the opening of the enclosure, shot blasting being ensured by the impacts of the microbeads on the part, the enclosure and the room being animated by a relative movement aiming at passing the enclosure on the entire surface of the piece to be blasted. The patent also shows how shot blast circular parts such as trees.
Le terme "brouillard" est utilisé par analogie avec les brouillards formés de minuscules gouttelettes d'eau. En effet, dans le procédé de grenaillage par ultrasons, les microbilles sont animées de vitesses aléatoires en module et en direction, ce qui les fait ricocher entre elles, contre les parois de l'enceinte et contre la surface de la pièce au contact du brouillard de microbilles.The term "fog" is used by analogy with fogs formed of tiny droplets of water. Indeed, in the process of ultrasonic shot blasting, the microbeads are animated with random speeds in modulus and direction, which makes them ricochet between them, against the walls of the enclosure and against the surface of the room in contact with the mist of microbeads.
Ce brevet donne des exemples de pièces massives capables de reprendre sans se déformer les sollicitations résultant du grenaillage. Ce procédé ne permet pas cependant de grenailler des pièces circulaires minces, car celles-ci commencent à se déformer très tôt pendant le grenaillage même. Même si la surface est uniformément grenaillée, ces déformations ne sont que partiellement résorbées à la fin du grenaillage car la mise en contrainte s'effectue par la déformation plastique et non linéaire de la matière. De plus, le procédé exige que le grenaillage soit arrêté avec précision lorsque la pièce a fait un tour si on veut obtenir un grenaillage homogène. En effet, un arrêt tardif du grenaillage produira un excès localisé de grenaillage sur une zone de recouvrement alors qu'un arrêt prématuré produira un manque localisé de grenaillage qu'il sera difficile de compléter sans provoquer un grenaillage excessif juste à coté.This patent gives examples of massive pieces able to resume without distort the stresses resulting from shot blasting. However, this process does not allow to blast thin circular pieces, because they start to deform very early during shot blasting even. Even if the surface is uniformly blasted, these deformations are only partially absorbed at the end of shot blasting because the stress is achieved by the plastic and non-linear deformation of the material. Moreover, the process requires that shot blasting be stopped accurately when the piece has made a turn if you want to get a uniform shot blasting. Indeed, a late stop shot blasting produce a localized excess of shot blasting on a lap premature will produce a localized lack of shot blasting that will be difficult to complete without causing excessive blasting just next door.
Un premier problème à résoudre est de grenailler sans les déformer les pièces minces et circulaires dont les dimensions sont supérieures à celles de l'enceinte de grenaillage.A first problem to solve is to blast without deforming the thin parts and the dimensions of which are greater than those of the shot blasting chamber.
Un second problème à résoudre est de garantir un grenaillage homogène sur toute la surface à grenailler. A second problem to be solved is to guarantee uniform shot blasting over the entire surface to be blasted.
L'invention propose un procédé de grenaillage par ultrasons de surfaces annulaires de grande dimensions sur des pièces minces, ledit procédé consistant à faire passer la surface à grenailler devant l'ouverture d'une enceinte de grenaillage, ladite enceinte renfermant un "brouillard" de microbilles entretenu par un vibrateur à l'intérieur de l'enceinte, lesdites microbilles venant impacter la portion de la surface à grenailler présentée devant l'ouverture, lesdits impacts provoquant le grenaillage, ladite enceinte et ladite pièce étant animées d'un mouvement relatif de rotation pour faire passer toute la surface à grenailler devant l'ouverture de l'enceinte pendant le grenaillage.The invention proposes a method of ultrasonic blasting of annular surfaces of large dimensions on thin pieces, said method of passing the surface to be shot-blasted in front of the opening of a blasting chamber, said enclosure containing a "mist" of microbeads maintained by a vibrator inside the enclosure, said microbeads impinging the portion of the surface to be blasted presented in front of the opening, said impacts causing shot blasting, said enclosure and said part being driven by a relative rotational movement to make the whole of the surface to be blasted in front of the opening of the enclosure during shot blasting.
Un tel procédé est remarquable en ce que la surface à grenailler effectue pendant le grenaillage au moins N = cinq révolutions devant l'ouverture de l'enceinte, et en ce que la surface à grenailler est positionnée devant l'ouverture avec un jeu inférieur au diamètre des microbilles utilisées.Such a process is remarkable in that the surface to be shot blasted during the shot blasting at least N = five revolutions before the opening of the enclosure, and in that the surface to be blasted is positioned in front of the opening with a play less than the diameter of the microbeads used.
En d'autres termes, le grenaillage est effectué en N passages devant l'ouverture de l'enceinte, chaque point de la surface à grenailler passant N fois devant l'ouverture de l'enceinte, chaque passage apportant une fraction sensiblement égale à 1/N du grenaillage total à effectuer.In other words, shotblasting is done in N passes in front of the opening of the enclosure, each point of the shot-blasting surface passing N times before the opening of the enclosure, each passage providing a fraction substantially equal to 1 / N of total shot blasting to be done.
Un tel procédé a pour effet d'améliorer l'homogénéité du grenaillage sur toute la surface à grenailler pendant l'exécution même du grenaillage. Il a été constaté que cette homogénéité réduit les déformations de la pièce pendant le grenaillage ainsi que les déformations résiduelles de la pièce lorsque le grenaillage est achevé. Ce résultat pourrait s'expliquer par le fait que les sollicitations imposées à la pièce pendant le grenaillage restent sensiblement uniformes sur toute la surface grenaillée. Ainsi est résolu le premier problème.Such a process has the effect of improving the homogeneity of shot blasting on the entire surface to shot blast during the execution of shot blasting. It has been found that this homogeneity reduces deformations of the workpiece during shot blasting as well as Residual deformations of the part when the shot blasting is completed. This result could be explained by the fact that the solicitations imposed on the piece during the shot blasting remain substantially uniform over the entire blasted surface. So is solved the first problem.
De plus, il n'est plus nécessaire d'arrêter le grenaillage avec précision lorsque la pièce aura fait N passages devant l'enceinte de grenaillage, car l'excès ou le manque de grenaillage résultant de cette imprécision sera au plus égale à 1/N du grenaillage total, ce qui résout le second problème.In addition, it is no longer necessary to stop shot blasting accurately when the piece will have made N passes in front of the blasting enclosure, because the excess or the lack of shot blasting resulting from this inaccuracy will be at most equal to 1 / N total shot blasting, which solves the second problem.
L'inventeur considère que le résultat obtenu est acceptable à partir de N = 5 révolutions. Ce résultat sera évidemment meilleur avec un nombre de révolutions plus important, par exemple 20 ou 100. Un nombre N important s'impose pour grenailler des pièces très minces. The inventor considers that the result obtained is acceptable from N = 5 revolutions. This result will obviously be better with a higher number of revolutions, for example 20 or 100. A large number N is needed for shot blasting very thin.
Un avantage du procédé est de permettre de permettre un grenaillage important et poussé jusqu'à l'optimal sur des pièces minces sans les déformer, puisque pendant tout le grenaillage, les sollicitations imposées à la pièce restent uniformes.An advantage of the method is to allow to allow a large shot blasting and pushed to optimal on thin parts without deforming them, since during all shot peening, the stresses imposed on the part remain uniform.
Le procédé objet de la présente demande de brevet d'invention ne saurait être confondu avec le procédé divulgué dans le brevet cité et ne nous paraít non plus être suggéré par ce brevet. Bien que le brevet ne dise pas explicitement que le grenaillage est effectué en un seul passage, il le sous-entend. En effet.The process which is the subject of the present patent application can not be confused with the method disclosed in the cited patent and also does not appear to be suggested by this patent. Although the patent does not explicitly state that shot peening is carried out in a single passage, he implies it. Indeed.
En page 7 ligne 20 est donnée la formule Vi = Ai / To, Vi étant la vitesse de déplacement
de l'enceinte sur la pièce, Ai étant la largeur de la surface vibrante qui se confond
sensiblement avec la largeur de l'enceinte au vu de la figure 1 et To étant la durée de
l'exposition de la surface au grenaillage, cette durée étant donnée par une formule en
page 7 ligne 7. Si le grenaillage était effectué en N passages, il aurait fallu écrire Vi = N
x Ai / To afin que chaque partie de la surface grenaillée soit bien exposée pendant la
durée To. Donc, N = 1 est la seule façon d'interpréter ce brevet.On page 7
Par ailleurs, il est dit notamment en page 7 lignes 24 à 34 qu'une vitesse supérieure conduit à un grenaillage insuffisant alors qu'une vitesse inférieure conduit à un "écrouissage excessif". Le paramètre vitesse Vi est ici important car il faut grenailler exactement toute la périphérie de la pièce en un seul tour ou en un très petit nombre de tours, afin de respecter la durée To pendant laquelle chaque partie de surface doit être exposée au grenaillage. Avec la présente invention au contraire, ce paramètre vitesse est sans importance, à condition évidemment qu'il reste faible en comparaison de la vitesse des microbilles venant impacter la pièce.Furthermore, it says in particular on page 7 lines 24 to 34 that a higher speed leads to insufficient blasting while a lower speed leads to "excessive hardening". The Vi speed setting is important here because you have to blast exactly the entire periphery of the piece in a single turn or in a very small number of in order to respect the duration To during which each surface part must be exposed to shot blasting. With the present invention on the contrary, this parameter speed is irrelevant, provided of course that it remains low in comparison with the speed of microbeads impacting the room.
L'invention sera mieux comprise et les avantages qu'elle procure apparaítront plus clairement au vu d'un exemple détaillé de réalisation et de la figure unique annexée illustrant le grenaillage de la surface d'appui de la bride d'un cône d'entraínement de turbomoteur pour aéronef.The invention will be better understood and the benefits it provides will become more apparent clearly in view of a detailed example of implementation and the single figure annexed illustrating the blasting of the bearing surface of the flange of a drive cone of turbine engine for aircraft.
On se reportera à la figure unique. La pièce 1 est un cône d'entraínement sur un
turbomoteur pour aéronef. La pièce 1 est constituée par une paroi mince et a une forme
circulaire de révolution autour d'un axe géométrique 2. La pièce 1 comporte un fût 3
tronconique dont l'extrémité de plus grand diamètre est prolongée radialement par une
bride 4, ladite bride 4 comportant elle-même une surface d'appui 5 à grenailler, ladite
surface d'appui 5 étant annulaire, plane et radiale.We will refer to the single figure. Part 1 is a training cone on a
turbine engine for aircraft. Part 1 consists of a thin wall and has a shape
circle of revolution around a
On utilise une enceinte 10 à l'intérieur de laquelle est entretenu un brouillard de
microbilles 11, ladite enceinte étant délimitée latéralement par une paroi 12, ladite
enceinte comportant une ouverture 13 dont les bords sont référencés 14. On utilise
également un vibrateur 20 constitué par une sonotrode 21 mise en résonance par l'une
de ses extrémités par un générateur 22 de vibrations qui est habituellement à quartz,
l'autre extrémité de la sonotrode 21 comportant une surface 23 vibrante et sensiblement
plane, ladite surface vibrante 23 étant placée au fond de l'enceinte 10 et étant en regard
de l'ouverture 13. Le générateur de vibrations 22 met en résonance longitudinale la
sonotrode 21. La surface vibrante 23 ainsi excitée transmet de l'énergie aux microbilles
qui rebondissent sur la surface à grenailler 5 en regard de l'ouverture 13 et sur les parois
de l'enceinte 12, lesdites microbilles perdant alors progressivement de l'énergie, lesdites
microbilles arrivant également sur la surface vibrante 23 qui leur redonne une nouvelle
énergie. Ainsi, les microbilles se meuvent à l'intérieur de l'enceinte à des vitesses
aléatoires en grandeur et en direction, ces microbilles formant ainsi un véritable
"brouillard" de microbilles à l'intérieur de l'enceinte 10.An
Pour grenailler le surface 5 :
- on met une dose de microbilles dans l'enceinte,
- on positionne la pièce 1 de façon à amener la surface à grenailler 5 devant
l'ouverture 13 avec un jeu E par rapport aux
bords 14 de l'ouverture 13, ledit jeu E étant inférieur au diamètre des microbilles, - on met la pièce 1 en rotation selon
son axe géométrique 2, - on active le générateur de
vibrations 23 pendant une durée préétablie T, ladite vitesse de rotation étant calculée simplement pour que la pièce fasse au moins N = 5 tours pendant la durée T, - on arrête le générateur de
vibration 23 au bout du temps T et on retire la pièce 1.
- we put a dose of microbeads in the chamber,
- the part 1 is positioned so as to cause the surface to be blasted 5 in front of the
opening 13 with a clearance E with respect to theedges 14 of theopening 13, said clearance E being smaller than the diameter of the microbeads, - the workpiece 1 is rotated along its
geometric axis 2, - the
vibration generator 23 is activated for a predetermined duration T, said rotation speed being calculated simply so that the part makes at least N = 5 revolutions during the duration T, - the
vibration generator 23 is stopped at the end of the time T and the part 1 is removed.
Un avantage du procédé est que le grenaillage est effectué sans contact entre la pièce 1
et l'enceinte 10, ce qui permet d'éviter toute dégradation de la surface de la pièce. An advantage of the method is that the shot peening is carried out without contact between the piece 1
and the
Malgré cela, les microbilles sont retenues à l'intérieur de l'enceinte 10 car le jeu E est
inférieur au diamètre desdites microbilles.Despite this, the microbeads are retained inside the
Cette disposition a aussi l'avantage d'éviter l'utilisation de patins d'usure sur l'enceinte 10This arrangement also has the advantage of avoiding the use of wear pads on the
La durée totale T pendant laquelle la pièce est exposée au grenaillage est donnée par la
formule :
Si la surface 5 à grenailler n'est pas plane, on donnera aux bords 14 de l'enceinte 10
une forme complémentaire à ladite surface, afin de maintenir le jeu E.If the
Claims (1)
- Process for the ultrasonic beadblasting of large-size annular surfaces on thin components, the said process consisting of passing the surface to be beadblasted (5) in front of the opening (13) of an ultrasonic beadblasting chamber (10), the said opening (13) having edges (14), the said chamber (10) enclosing a "mist" of ballotini (11) maintained by a vibrator (20) inside the chamber (10), the said ballotini impacting the portion of the surface to be beadblasted (5) presented in front of the opening (13), the said impacts bringing about beadblasting, the said chamber (10) and the said component (1) being given a relative rotational movement so that all the surface to be beadblasted is passed in front of the opening (13) during beadblasting,
characterized in that the surface to be beadblasted (5) is positioned in front of the opening (13) with a clearance E, the said clearance E being less than the diameter of the ballotini used, and in that the said surface performs at least N = five revolutions in front of the opening (13) during beadblasting.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9914481A FR2801322B1 (en) | 1999-11-18 | 1999-11-18 | METHOD FOR ULTRASONIC BLASTING OF LARGE DIMENSIONAL ANNULAR SURFACES ON THIN PARTS |
| FR9914481 | 1999-11-18 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1101827A1 EP1101827A1 (en) | 2001-05-23 |
| EP1101827B1 true EP1101827B1 (en) | 2005-01-26 |
Family
ID=9552239
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP00403183A Expired - Lifetime EP1101827B1 (en) | 1999-11-18 | 2000-11-16 | Process for ultrasonic shotpeening large annular surfaces of thinwalled workpieces |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US6289705B1 (en) |
| EP (1) | EP1101827B1 (en) |
| JP (1) | JP4267199B2 (en) |
| CA (1) | CA2325897C (en) |
| DE (1) | DE60017681T2 (en) |
| ES (1) | ES2233310T3 (en) |
| FR (1) | FR2801322B1 (en) |
| RU (1) | RU2210602C2 (en) |
| UA (1) | UA66403C2 (en) |
| WO (1) | WO2001036692A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6932876B1 (en) | 1998-09-03 | 2005-08-23 | U.I.T., L.L.C. | Ultrasonic impact machining of body surfaces to correct defects and strengthen work surfaces |
| US20060016858A1 (en) * | 1998-09-03 | 2006-01-26 | U.I.T., Llc | Method of improving quality and reliability of welded rail joint properties by ultrasonic impact treatment |
| US6338765B1 (en) | 1998-09-03 | 2002-01-15 | Uit, L.L.C. | Ultrasonic impact methods for treatment of welded structures |
| US6458225B1 (en) * | 1998-09-03 | 2002-10-01 | Uit, L.L.C. Company | Ultrasonic machining and reconfiguration of braking surfaces |
| US20050145306A1 (en) * | 1998-09-03 | 2005-07-07 | Uit, L.L.C. Company | Welded joints with new properties and provision of such properties by ultrasonic impact treatment |
| FR2814099B1 (en) * | 2000-09-21 | 2002-12-20 | Snecma Moteurs | CROSS-SECTIONAL SENSING BY ULTRASSONS OF BLADES ON A ROTOR |
| US7028378B2 (en) * | 2000-10-12 | 2006-04-18 | Sonats-Societe Des Nouvelles Applications Des Techniques De Surfaces | Method of shot blasting and a machine for implementing such a method |
| FR2816537B1 (en) | 2000-11-16 | 2003-01-17 | Snecma Moteurs | METHOD AND INSTALLATION FOR ULTRASONIC SCRATCHING OF ANNULAR AUB ATTACHES ALVEOLES ON A ROTOR |
| FR2816636B1 (en) | 2000-11-16 | 2003-07-18 | Snecma Moteurs | SHOT BLASTING OF COOLED DAWN TOP |
| 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 |
| JP2005192194A (en) * | 2003-12-05 | 2005-07-14 | Yazaki Corp | Communication apparatus and communication system |
| US7399371B2 (en) * | 2004-04-16 | 2008-07-15 | Nippon Steel Corporation | Treatment method for improving fatigue life and long-life metal material treated by using same treatment |
| US7301123B2 (en) | 2004-04-29 | 2007-11-27 | U.I.T., L.L.C. | Method for modifying or producing materials and joints with specific properties by generating and applying adaptive impulses a normalizing energy thereof and pauses therebetween |
| DE102004029546A1 (en) * | 2004-06-19 | 2006-01-05 | Mtu Aero Engines Gmbh | Method and apparatus for surface blasting gas turbine blades in the area of their blade roots |
| US20060021410A1 (en) | 2004-07-30 | 2006-02-02 | Sonats-Societe Des Nouvelles Applications Des Techniques De Surfaces | Shot, devices, and installations for ultrasonic peening, and parts treated thereby |
| DE102004037954A1 (en) * | 2004-08-05 | 2006-03-16 | Mtu Aero Engines Gmbh | Device for surface blasting of components |
| DE102004059592B4 (en) * | 2004-12-10 | 2014-09-04 | MTU Aero Engines AG | Method for surface blasting of cavities, in particular of cavities on gas turbines |
| JP4985644B2 (en) * | 2005-05-12 | 2012-07-25 | ゼネラル・エレクトリック・カンパニイ | Ultrasonic peening treatment of assembled parts |
| US7276824B2 (en) * | 2005-08-19 | 2007-10-02 | U.I.T., L.L.C. | Oscillating system and tool for ultrasonic impact treatment |
| US20070068605A1 (en) * | 2005-09-23 | 2007-03-29 | U.I.T., Llc | Method of metal performance improvement and protection against degradation and suppression thereof by ultrasonic impact |
| DE102005054866A1 (en) † | 2005-11-17 | 2007-05-31 | Mtu Aero Engines Gmbh | Method for producing metallic components, in particular for turbomachinery, with small edge radii |
| US20070244595A1 (en) * | 2006-04-18 | 2007-10-18 | U.I.T., Llc | Method and means for ultrasonic impact machining of surfaces of machine components |
| DE102006036519A1 (en) * | 2006-08-04 | 2008-02-07 | Mtu Aero Engines Gmbh | Cover element for a sonotrode and blasting chamber arrangement for surface blasting of components |
| US7665338B2 (en) * | 2006-10-20 | 2010-02-23 | Sonats-Societe Des Nouvelles Applications Des Techniques De Surfaces | Shot peening methods and units |
| FR2907360B1 (en) * | 2006-10-20 | 2009-05-22 | Sonats Soc Des Nouvelles Appli | METHODS AND INSTALLATIONS OF SCRATCHES. |
| DE102007009470A1 (en) * | 2007-02-27 | 2008-08-28 | Daimler Ag | Shot-peening mask for gas turbine gear wheel tooth defines limits of area for differential treatment |
| US20090095043A1 (en) * | 2007-10-11 | 2009-04-16 | Bunting Billie W | Conformable tooling for localized shot peening |
| FR2930184B1 (en) * | 2008-04-18 | 2010-12-31 | Snecma | PROCESS FOR ULTRASONIC CRUSHING OF TURBOMACHINE PARTS. |
| JP5912916B2 (en) * | 2012-06-27 | 2016-04-27 | 日立Ｇｅニュークリア・エナジー株式会社 | Shot peening method |
| WO2019097275A1 (en) * | 2017-11-15 | 2019-05-23 | Arcelormittal | Treatment method for a cutting piece, and associated equipment |
| CN113084714A (en) * | 2021-04-21 | 2021-07-09 | 中国科学院宁波材料技术与工程研究所 | Cavitation shot blasting device |
| CN114941066B (en) * | 2022-05-27 | 2023-06-02 | 南京航空航天大学 | Liquid nitrogen cooled ultrasonic shot peening device and method |
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| SU1435627A1 (en) * | 1987-04-06 | 1988-11-07 | Кузнецкий металлургический комбинат им.В.И.Ленина | Method of strengthening steel articles |
| DE4041103A1 (en) * | 1990-12-21 | 1992-07-02 | Mtu Muenchen Gmbh | METHOD FOR TREATMENT OF COMPONENTS |
| FR2689431B1 (en) * | 1992-04-06 | 1995-10-20 | Teknoson | METHOD AND DEVICE, IN PARTICULAR FOR ULTRASONIC HARDENING OF METAL PARTS. |
| FR2715884B1 (en) * | 1994-02-04 | 1996-04-12 | Gec Alsthom Electromec | Method and device for the surface treatment and the prestressing of the interior wall of a cavity. |
| FR2743742B1 (en) * | 1996-01-24 | 1998-04-03 | Seb Sa | PROCESS FOR TREATING A METAL SURFACE AND MANUFACTURING A CULINARY ARTICLE |
| RU2130085C1 (en) * | 1997-05-29 | 1999-05-10 | Казаков Владимир Михайлович | Process of surface hardening of parts |
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1999
- 1999-11-18 FR FR9914481A patent/FR2801322B1/en not_active Expired - Fee Related
-
2000
- 2000-11-16 UA UA2001085828A patent/UA66403C2/en unknown
- 2000-11-16 DE DE60017681T patent/DE60017681T2/en not_active Expired - Lifetime
- 2000-11-16 ES ES00403183T patent/ES2233310T3/en not_active Expired - Lifetime
- 2000-11-16 RU RU2001123241/02A patent/RU2210602C2/en active
- 2000-11-16 CA CA002325897A patent/CA2325897C/en not_active Expired - Lifetime
- 2000-11-16 WO PCT/FR2000/003182 patent/WO2001036692A1/en unknown
- 2000-11-16 EP EP00403183A patent/EP1101827B1/en not_active Expired - Lifetime
- 2000-11-17 US US09/714,223 patent/US6289705B1/en not_active Expired - Lifetime
- 2000-11-17 JP JP2000351647A patent/JP4267199B2/en not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| Metals Handbook, Vol. 5, Surface cleaning, Finishing and Coating, 9ième édition, 1982, pages 138-140 * |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2801322A1 (en) | 2001-05-25 |
| CA2325897A1 (en) | 2001-05-18 |
| US6289705B1 (en) | 2001-09-18 |
| WO2001036692A1 (en) | 2001-05-25 |
| JP2001170866A (en) | 2001-06-26 |
| DE60017681T2 (en) | 2005-12-22 |
| JP4267199B2 (en) | 2009-05-27 |
| RU2210602C2 (en) | 2003-08-20 |
| CA2325897C (en) | 2007-09-18 |
| DE60017681D1 (en) | 2005-03-03 |
| EP1101827A1 (en) | 2001-05-23 |
| FR2801322B1 (en) | 2002-02-08 |
| ES2233310T3 (en) | 2005-06-16 |
| UA66403C2 (en) | 2004-05-17 |
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