EP1101827A1 - 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
- EP1101827A1 EP1101827A1 EP00403183A EP00403183A EP1101827A1 EP 1101827 A1 EP1101827 A1 EP 1101827A1 EP 00403183 A EP00403183 A EP 00403183A EP 00403183 A EP00403183 A EP 00403183A EP 1101827 A1 EP1101827 A1 EP 1101827A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- shot
- blasting
- enclosure
- opening
- microbeads
- 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.)
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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 shot blasting process called "ultrasonic" using a fog of microbeads inside an enclosure and more particularly at a shot blasting process of large annular surfaces on workpieces thin.
- microbeads are commonly rolling bearing balls. They are usually ceramic or steel with a diameter of 0.2mm to 4mm. The shot blasting is carried out inside a closed cabin using powered nozzles simultaneously compressed gas and microbeads, the compressed gas ensuring the propulsion of microbeads.
- fog is used by analogy with tiny fogs water droplets.
- the microbeads are driven by random speeds in module and direction, which makes them ricochet between them, against the walls of the enclosure and against the surface of the part in contact with the microbead fog.
- This patent gives examples of massive parts capable of recovering without deform the stresses resulting from shot peening.
- this process does not allow to blast thin circular pieces, because they start to deform very early during shot blasting itself. Even if the surface is uniformly blasted, these deformations are only partially absorbed at the end of shot blasting because the stress is effected by the plastic and non-linear deformation of the material.
- the process requires that shot peening be stopped precisely when the part has made a turn if you want to get a homogeneous shot blasting. Indeed, a late stopping of shot blasting will produce a localized excess of shot blasting on an overlap area while a stop premature will produce a localized lack of shot peening that will be difficult to complete without causing excessive blasting right next to it.
- a first problem to solve is to blast the thin pieces without deforming them and circular whose dimensions are greater than those of the blasting chamber.
- a second problem to be solved is to guarantee homogeneous shot blasting over the entire surface to be shot blasted.
- the invention provides a method of ultrasonic blasting of large annular surfaces on thin parts, said method consisting in passing the surface to be blasted in front of the opening of a blasting chamber, said chamber containing a "mist" of microbeads maintained by a vibrator inside the enclosure, said microbeads impacting the portion of the surface to be blasted presented in front of the opening, said impacts causing blasting, said enclosure and said part being animated by a relative movement of rotation to pass the entire surface to be shot blasted in front of the enclosure opening during shot blasting.
- the blasting is carried out in N passages in front of the opening of the enclosure, each point of the surface to be blasted passing N times in front of the opening of the enclosure, each passage bringing a fraction substantially equal to 1 / N of the total shot blasting to be carried out.
- the effect of such a process is to improve the homogeneity of the peening over the entire surface to be peened during the actual execution of the peening. It has been found that this homogeneity reduces the deformations of the part during shot peening as well as the residual deformations of the part when shot peening is completed. This result could be explained by the fact that the stresses imposed on the part during blasting remain substantially uniform over the entire blasted surface. Thus the first problem is solved.
- N 5 revolutions. This result will obviously be better with a higher number of revolutions, by example 20 or 100. A large number N is necessary for blasting very thin.
- An advantage of the process is that it allows a large shot peening pushed to the optimum on thin parts without deforming them, since during all shot peening, the stresses imposed on the part remain uniform.
- N 1 is the only way to interpret this patent. Furthermore, it is said in particular on page 7 lines 24 to 34 that a higher speed leads to insufficient shot peening while a lower speed leads to "excessive work hardening".
- the speed parameter Vi is here important because it is necessary to blast exactly the entire periphery of the part in a single turn or in a very small number of turns, in order to respect the duration To during which each part of the surface must be exposed to shot blasting. On the contrary, with the present invention, this speed parameter is of no importance, provided of course that it remains low in comparison with the speed of the microbeads impacting the part.
- the part 1 is a training cone on a aircraft turbine engine.
- the part 1 is constituted by a thin wall and has a shape circular of revolution around a geometric axis 2.
- the part 1 comprises a barrel 3 frustoconical whose end of larger diameter is extended radially by a flange 4, said flange 4 itself comprising a bearing surface 5 for blasting, said bearing surface 5 being annular, planar and radial.
- An enclosure 10 is used inside of which a mist 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 brought into resonance by one from its ends by a vibration generator 22 which is usually quartz, the other end of the horn 21 having a vibrating surface 23 and substantially flat, said vibrating surface 23 being placed at the bottom of the enclosure 10 and being opposite of the opening 13.
- the vibration generator 22 brings the longitudinal resonance of the sonotrode 21.
- the vibrating surface 23 thus excited transmits energy to the microbeads which rebound on the surface to be shot 5 opposite the opening 13 and on the walls of enclosure 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 "mist" of microbeads inside the enclosure 10.
- An advantage of the process is that the shot peening is carried out without contact between the part 1 and the enclosure 10, which makes it possible to avoid any degradation of the surface of the part. Despite this, the microbeads are retained inside the enclosure 10 because the clearance 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 the exposure to shot-blasting of each element of the surface to be shot 5, D is the average diameter of said surface 5 and L is the width of the enclosure 10 taken tangentially to the movement of said surface 5 in front 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 clearance E.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
- Sliding-Contact Bearings (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
Abstract
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 shot blasting process called "ultrasonic" using a fog of microbeads inside an enclosure and more particularly at a shot blasting process of large annular surfaces on workpieces 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 peel the surface of metal parts by projecting microbeads. By impacting the surface of the part with a small angle of incidence relative to the perpendicular to this surface and with sufficient kinetic energy, the microbeads cause permanent compression of the surface over a low thickness. This compression is opposed to the appearance and progression of cracks on the surface of the part and thus improves its resistance to fatigue. Microbeads are commonly rolling bearing balls. They are usually ceramic or steel with a diameter of 0.2mm to 4mm. The shot blasting is carried out inside a closed cabin using powered nozzles simultaneously 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 blasting is often light so as not to deform thin parts. These in fact cannot resume without deforming the stresses caused by the compression stresses resulting from a significant blasting, this compression then extending in depth under the blasted surface.
- The exposure of the part to shot peening goes through an optimum which gives this part the best resistance. Such shot peening is however difficult to ensure because the peening nozzles are difficult to adjust and are not stable. Thus, an insufficient shot blasting does not give the expected resistance, but it is still possible to reach the optimum by carrying out a complementary shot blasting. On the contrary, an excessive shot-blasting causes an irrecoverable surface 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.We know from patent FR.2.689.431 a shot blasting process said improperly "by ultrasonic "consisting in maintaining a" mist "of microbeads inside a enclosure, maintenance being carried out using a vibrator acting at frequencies of around 20 KH, the enclosure being open, the part being applied against the opening of the enclosure, shot peening being provided by the impacts of the microbeads on the part, the enclosure and the room being animated by a relative movement aimed at passing the enclosure over the entire surface of the workpiece. The patent also shows how to blast circular pieces like 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 tiny fogs water droplets. In fact, in the ultrasonic shot peening process, the microbeads are driven by random speeds in module and direction, which makes them ricochet between them, against the walls of the enclosure and against the surface of the part in contact with the microbead fog.
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 parts capable of recovering without deform the stresses resulting from shot peening. However, this process does not allow to blast thin circular pieces, because they start to deform very early during shot blasting itself. Even if the surface is uniformly blasted, these deformations are only partially absorbed at the end of shot blasting because the stress is effected by the plastic and non-linear deformation of the material. Moreover, the process requires that shot peening be stopped precisely when the part has made a turn if you want to get a homogeneous shot blasting. Indeed, a late stopping of shot blasting will produce a localized excess of shot blasting on an overlap area while a stop premature will produce a localized lack of shot peening that will be difficult to complete without causing excessive blasting right next to it.
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 the thin pieces without deforming them and circular whose dimensions are greater than those of the 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 homogeneous shot blasting over the entire surface to be shot 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.
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.The invention provides a method of ultrasonic blasting of large annular surfaces on thin parts, said method consisting in passing the surface to be blasted in front of the opening of a blasting chamber, said chamber containing a "mist" of microbeads maintained by a vibrator inside the enclosure, said microbeads impacting the portion of the surface to be blasted presented in front of the opening, said impacts causing blasting, said enclosure and said part being animated by a relative movement of rotation to pass the entire surface to be shot blasted in front of the enclosure opening during shot blasting.
Such a method is remarkable in that the surface to be blasted performs during blasting at least N = five revolutions before the opening of the enclosure.
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.
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.In other words, the blasting is carried out in N passages in front of the opening of the enclosure, each point of the surface to be blasted passing N times in front of the opening of the enclosure, each passage bringing a fraction substantially equal to 1 / N of the total shot blasting to be carried out.
The effect of such a process is to improve the homogeneity of the peening over the entire surface to be peened during the actual execution of the peening. It has been found that this homogeneity reduces the deformations of the part during shot peening as well as the residual deformations of the part when shot peening is completed. This result could be explained by the fact that the stresses imposed on the part during blasting remain substantially uniform over the entire blasted surface. Thus the first problem is solved.
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 blasting with precision when the part will have made N passes in front of the blasting chamber, because the excess or lack of shot blasting resulting from this imprecision will be at most equal to 1 / N of the 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, by example 20 or 100. A large number N is necessary for 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 process is that it allows a large shot peening pushed to the optimum 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.
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.
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.The process which is the subject of this patent application cannot be confused with the process disclosed in the cited patent and does not seem to us to be suggested by this patent either. Although the patent does not explicitly say that shot peening is done in a single pass, it does mean so. Indeed.
On page 7
Furthermore, it is said in particular on page 7 lines 24 to 34 that a higher speed leads to insufficient shot peening while a lower speed leads to "excessive work hardening". The speed parameter Vi is here important because it is necessary to blast exactly the entire periphery of the part in a single turn or in a very small number of turns, in order to respect the duration To during which each part of the surface must be exposed to shot blasting. On the contrary, with the present invention, this speed parameter is of no importance, provided of course that it remains low in comparison with the speed of the microbeads impacting the part.
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 advantages it provides will appear more clearly in view of a detailed example of embodiment and the single figure appended illustrating the shot peening of the support surface of the flange of a drive cone of aircraft turbine engine.
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. The part 1 is a training cone on a
aircraft turbine engine. The part 1 is constituted by a thin wall and has a shape
circular 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 enclosure,
- the part 1 is positioned so as to bring the surface to be shot-blasted 5 in front of the
opening 13 with a clearance E relative to theedges 14 of theopening 13, said clearance E being less than the diameter of the microbeads, - the part 1 is rotated along its
geometric axis 2, - the
vibration generator 23 is activated for a preset time T, said speed of rotation being calculated simply so that the part makes at least N = 5 turns during the time T, - the
vibration generator 23 is stopped at the end of 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.
Malgré cela, les microbilles sont retenues à l'intérieur de l'enceinte 10 car le jeu E est
inférieur au diamètre desdites microbilles.
Cette disposition a aussi l'avantage d'éviter l'utilisation de patins d'usure sur l'enceinte 10An advantage of the process is that the shot peening is carried out without contact between the part 1 and the
Despite this, the microbeads are retained inside the
This 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 (2)
caractérisé en ce que la surface à grenailler (5) effectue au moins N = cinq révolutions devant l'ouverture (13) pendant le grenaillage.Method for ultrasonically blasting large annular surfaces on thin workpieces, said method comprising passing the surface to be blasted (5) in front of the opening (13) of an enclosure (10) for ultrasonic blasting, said enclosure (10) containing a "mist" of microbeads (11) maintained by a vibrator (20) inside the enclosure (10), said microbeads coming to impact the portion of the surface to be shot blasted (5) presented in front of the opening (13), said impacts causing shot-blasting, said enclosure (10) and said part (1) being driven in a relative movement of rotation so as to pass the entire surface to be shot-blasted in front of the opening (13) during shot-blasting,
characterized in that the surface to be blasted (5) performs at least N = five revolutions in front of the opening (13) during the blasting.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9914481 | 1999-11-18 | ||
| FR9914481A FR2801322B1 (en) | 1999-11-18 | 1999-11-18 | METHOD FOR ULTRASONIC BLASTING OF LARGE DIMENSIONAL ANNULAR SURFACES ON THIN PARTS |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1101827A1 true EP1101827A1 (en) | 2001-05-23 |
| EP1101827B1 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) |
Cited By (1)
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|---|---|---|---|---|
| FR2816538A1 (en) * | 2000-11-16 | 2002-05-17 | Snecma Moteurs | METHOD FOR INCREASING THE LIFETIME OF DAWN FASTENERS ON A ROTOR |
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| 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 |
| US6458225B1 (en) * | 1998-09-03 | 2002-10-01 | Uit, L.L.C. Company | Ultrasonic machining and reconfiguration of braking surfaces |
| US6338765B1 (en) | 1998-09-03 | 2002-01-15 | Uit, L.L.C. | Ultrasonic impact methods for treatment of welded structures |
| 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 |
| 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 |
| 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 |
| FR2816636B1 (en) | 2000-11-16 | 2003-07-18 | Snecma Moteurs | SHOT BLASTING OF COOLED DAWN TOP |
| FR2816537B1 (en) | 2000-11-16 | 2003-01-17 | Snecma Moteurs | METHOD AND INSTALLATION FOR ULTRASONIC SCRATCHING OF ANNULAR AUB ATTACHES ALVEOLES ON A ROTOR |
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| 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 |
| ES2428692T3 (en) * | 2005-05-12 | 2013-11-08 | General Electric Company | Ultrasonic blasting treatment of assembled components |
| 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 |
| FR2907360B1 (en) * | 2006-10-20 | 2009-05-22 | Sonats Soc Des Nouvelles Appli | METHODS AND INSTALLATIONS OF SCRATCHES. |
| US7665338B2 (en) * | 2006-10-20 | 2010-02-23 | Sonats-Societe Des Nouvelles Applications Des Techniques De Surfaces | Shot peening methods and units |
| 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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| FR2743742B1 (en) * | 1996-01-24 | 1998-04-03 | Seb Sa | PROCESS FOR TREATING A METAL SURFACE AND MANUFACTURING A CULINARY ARTICLE |
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- 1999-11-18 FR FR9914481A patent/FR2801322B1/en not_active Expired - Fee Related
-
2000
- 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 RU RU2001123241/02A patent/RU2210602C2/en active
- 2000-11-16 DE DE60017681T patent/DE60017681T2/en not_active Expired - Lifetime
- 2000-11-16 UA UA2001085828A patent/UA66403C2/en unknown
- 2000-11-16 EP EP00403183A patent/EP1101827B1/en not_active Expired - Lifetime
- 2000-11-16 ES ES00403183T patent/ES2233310T3/en not_active Expired - Lifetime
- 2000-11-17 JP JP2000351647A patent/JP4267199B2/en not_active Expired - Lifetime
- 2000-11-17 US US09/714,223 patent/US6289705B1/en not_active Expired - Lifetime
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2816538A1 (en) * | 2000-11-16 | 2002-05-17 | Snecma Moteurs | METHOD FOR INCREASING THE LIFETIME OF DAWN FASTENERS ON A ROTOR |
| EP1207013A1 (en) * | 2000-11-16 | 2002-05-22 | Snecma Moteurs | Method for increasing the service life of rotor blade locking means |
| US6536109B2 (en) | 2000-11-16 | 2003-03-25 | Snecma Moteurs | Method for extending the life of attachments that attach blades to a rotor |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2001036692A1 (en) | 2001-05-25 |
| JP4267199B2 (en) | 2009-05-27 |
| DE60017681D1 (en) | 2005-03-03 |
| RU2210602C2 (en) | 2003-08-20 |
| DE60017681T2 (en) | 2005-12-22 |
| FR2801322B1 (en) | 2002-02-08 |
| FR2801322A1 (en) | 2001-05-25 |
| CA2325897C (en) | 2007-09-18 |
| ES2233310T3 (en) | 2005-06-16 |
| CA2325897A1 (en) | 2001-05-18 |
| UA66403C2 (en) | 2004-05-17 |
| US6289705B1 (en) | 2001-09-18 |
| JP2001170866A (en) | 2001-06-26 |
| EP1101827B1 (en) | 2005-01-26 |
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