EP2598288A1 - Device for dressing a grinding wheel, and use thereof in a centerless grinder for nuclear fuel pellets - Google Patents

Device for dressing a grinding wheel, and use thereof in a centerless grinder for nuclear fuel pellets

Info

Publication number
EP2598288A1
EP2598288A1 EP11735449.8A EP11735449A EP2598288A1 EP 2598288 A1 EP2598288 A1 EP 2598288A1 EP 11735449 A EP11735449 A EP 11735449A EP 2598288 A1 EP2598288 A1 EP 2598288A1
Authority
EP
European Patent Office
Prior art keywords
grinding wheel
grinding
corundum
stick
brightening
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP11735449.8A
Other languages
German (de)
French (fr)
Other versions
EP2598288B1 (en
Inventor
José BENED
Hervé MEDINA
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Orano Cycle SA
Original Assignee
Areva NC SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Areva NC SA filed Critical Areva NC SA
Publication of EP2598288A1 publication Critical patent/EP2598288A1/en
Application granted granted Critical
Publication of EP2598288B1 publication Critical patent/EP2598288B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B53/00—Devices or means for dressing or conditioning abrasive surfaces
    • B24B53/04—Devices or means for dressing or conditioning abrasive surfaces of cylindrical or conical surfaces on abrasive tools or wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B53/00—Devices or means for dressing or conditioning abrasive surfaces
    • B24B53/12—Dressing tools; Holders therefor

Definitions

  • the invention relates to a device for brightening grinding wheel or grinding wheel, based on diamond grains.
  • Centerless grinding is a known grinding process known for the grinding of cylindrical workpieces, particularly for nuclear fuel pellets.
  • a centerless grinding machine usually comprises two grinding wheels, one of which is a grinding wheel, which is used to rotate the pellets on themselves by moving them on a guide rail, called the enfilade rule in the case of nuclear fuel pellets, and the other is a working wheel and has the function of machining, that is to say rectify the diameter of the pellets.
  • a grinding wheel usually comprises at its periphery, as grinding elements, diamond-based bands attached by a metal binder or a resin. In the case of grinding wheels for nuclear fuel pellets, there are three types of strips: one for roughing, another for semi-finishing and the last for finishing pellets.
  • the efficiency of machining the grinding wheel depends on the condition of the diamonds and its fouling. To give teeth to the grinding wheel, it is necessary to perform a sharpening using corundum sticks.
  • the brightening is done by hand.
  • an operator inserts a corundum stick with a tool through the access door at the rear of a frame in which the grinder is arranged.
  • the operator then tries to position at best the corundum stick, that is to say, the closest to the perpendicular to the grinding wheel.
  • a small effort dependent on and brought by the manual pressure of the operator is thus applied by the corundum stick on the grinding wheel. While applying this effort, the operator tries to move at best the corundum stick over the entire width of the wheel.
  • the operator could consume up to about ten sticks of corundum. This operation may also involve a significant risk for the operator as well as risks damage to the grinding wheel by breaking a corundum stick in the frame.
  • the grinding tool of the grinding wheel has been developed to avoid these risks and to improve brightening.
  • the general object of the invention is the improvement of the brightening quality of the working wheel, and therefore of the ground parts, more particularly nuclear fuel pellets.
  • a particular aim is to reduce the risks incurred by an operator in charge of the brightening manually according to the state of the art and the risks of damage incurred by the grinding wheel.
  • the subject of the invention is a device for brightening a grinding wheel which, according to the invention, essentially comprises a sheath for holding laterally and guiding a corundum stick, a jack for applying, along its longitudinal axis. a constant thrust force of the corundum stick against the working wheel, means of solidarization of the cylinder rod at the end of a corundum stick, and linear guide means of the sleeve for translating the corundum stick parallel to the axis of the grinding wheel by holding it pushed against it with the same constant effort.
  • the brightening device according to the invention minimizes the risks and makes brightening more efficient, more precise and more reliable.
  • the brightening device according to the invention increases the life of a grinding wheel and improves the quality of the parts ground by it such as nuclear fuel pellets.
  • the sheath comprises an upwardly open groove of cross section with respect to its U-shaped longitudinal axis.
  • rollers corundum stick mounted in the sleeve substantially at the same longitudinal side, two of the rollers being opposite one another and each mounted on a branch of the U of the groove and the third being mounted on the top of the U of the groove, the space between the rollers and the bottom of the U of the groove being of dimensions corresponding to the nominal transverse dimensions of the corundum stick.
  • the rollers thus facilitate the guiding of the corundum stick, reduce friction and provide an anti-vibration function of the corundum stick in the sheath.
  • the cylinder is preferably a double-acting cylinder to further allow the distance of the corundum stick from the grinding wheel.
  • the jack is preferably still a pneumatic cylinder regulated by a pressure regulator.
  • the pressure of a pneumatic cylinder regulated ensures an effective brightening without much pressure on the grinding wheel.
  • the linear guide means are preferably constituted by dry running rails.
  • the device according to the invention may comprise two end stops of the linear guide means for limiting the displacement of the corundum stick to the width of the working wheel.
  • the device advantageously comprises a carriage in two parts pivotable relative to each other, the lower part of the carriage being permanently guided by the linear guide means, the upper part of the pivoting carriage between a rest position in which the sleeve is substantially parallel to the axis of the grinding wheel and a brightening position in which the sleeve is substantially perpendicular to the axis of the grinding wheel.
  • a lever for manually locking the pivoting of the upper part of the carriage can be provided.
  • the invention also relates to a brightening assembly for use in brightening a work wheel, comprising a corundum stick and a workpiece, one end of the workpiece being molded on the corundum stick, the workpiece including to the other its ends a mortise groove adapted to house the cylinder rod of the device described above, forming a tenon constituting a dovetail assembly between the post and the mortise.
  • a brightening assembly for use in brightening a work wheel, comprising a corundum stick and a workpiece, one end of the workpiece being molded on the corundum stick, the workpiece including to the other its ends a mortise groove adapted to house the cylinder rod of the device described above, forming a tenon constituting a dovetail assembly between the post and the mortise.
  • the piece may include a gripping pin to allow manual insertion of the corundum stick into the sleeve when new and its manual removal once worn.
  • the invention also relates to a centerless grinding machine comprising a grinding wheel for advancing the workpieces and a grinding wheel arranged next to the grinding wheel for grinding said workpieces and a work grinding device. described above and arranged near the grinding wheel facing it opposite the grinding wheel.
  • the centerless grinding machine is ideally suited for grinding nuclear fuel pellets.
  • FIG. 1 a top view of a brightening device according to the invention in a configuration installed near a work grinding wheel to brighten with a corundum stick secured
  • FIG. 2 is a view in longitudinal section of the device according to FIG. 1;
  • FIGS. 2A and 2B are detailed views of FIG. 2,
  • FIG. 3 shows a set of brightening with a corundum stick according to the invention.
  • FIG. 4 is a perspective view of a brightening device according to the invention implanted in a grinding machine without nuclear fuel pellets center in a glove box.
  • the brightening device 1 is shown in configuration installed near a grinding wheel 2 to be brightened.
  • the device 1 is fixed by screws 21 to the frame 20 supporting the grinding wheel.
  • the brightening device 1 comprises, first of all, a sheath 10 for holding laterally and guiding along its longitudinal axis X a stick of corundum 3. As shown, the sheath 10 comprises an upwardly open groove of cross-section with respect to its U-shaped longitudinal axis.
  • rollers 100, 101, 102 for guiding the corundum stick 3 are mounted in the sleeve 10 at substantially the same longitudinal edge, at its end which is closest to the working wheel to be sharpened.
  • a roller 100 is mounted on the top of the U of the groove of the sleeve and the other two 101, 102 are facing each other and each mounted on a branch of the U of the groove.
  • the space thus defined between the rollers 100, 101, 102 and the bottom 10 A of the U of the groove is of dimensions corresponding to the nominal transverse dimensions of the corundum stick 3 (FIG. 2B).
  • the device 1 also comprises a double-acting pneumatic cylinder 11 for applying a constant thrust force of the corundum stick 3 held and guided in the sleeve 10 against the working grindwheel 2.
  • Solidarisâtion of the rod 110 of cylinder corundum stick 3 is achieved by a tenon / mortise system. More exactly, an intermediate solidarity piece 4 is provided between the corundum stick 3 and the jack rod 11. As shown more clearly in FIG. 3, an end 40 of the piece 4 being molded on the stick of corundum 3. This piece 4 comprises at the other of its ends a groove 41 forming mortise adapted to accommodate the rod 110 cylinder forming tenon constituting a dovetail assembly between the tenon and the mortise.
  • the intermediate part 4 further comprises a gripping pin 42 which allows the manual introduction of a new corundum stick 3 in the sleeve 10 and its removal once worn.
  • the sheath 10 and the double-acting jack 11 are mounted on the upper part 120 of a carriage 12.
  • This carriage 12 is in two parts 120, 121 pivoting relative to each other.
  • the lower portion 121 of the carriage is slidably mounted permanently on linear guide rails 13 which are parallel to the Y axis of the grinding wheel 2.
  • the linear guide serves to move the sleeve 10 over the entire width of the grinding wheel. work 2 without variation of the distance between the sleeve 10 in the brightening position and the grinding wheel 2.
  • the guidance provided by the rails is preferably dry, when the brightening is performed in a constraining environment, such as a box gloves of a grinding machine without center of nuclear fuel pellets: this avoids the presence of a moderator in the glove box (a risk of criticality) and the pollution of the pellets.
  • the upper portion 120 of the carriage 12 is pivotable between a rest position in which the sheath 10 is substantially parallel to the Y axis of the grinding wheel 2 and a brightening position as shown in FIGS. 1, 2, 3 in FIG. which the sleeve 10 is substantially perpendicular to the axis of the grinding wheel 2.
  • the sleeve 10 can rotate by an angle of 90 °.
  • This locking lever 14 comprises a screw 140 fixed on the upper part 120 of the carriage 12 and an indexable handle 141 which ensures maintaining in position in each of the two positions (rest and brightening) of the tool part 10, 11.
  • the tool part 10, 11 pivots by loosening the locking lever 14 and therefore the screw 140 and then sliding it in an opening 1200 made on the upper part 120 of the carriage 12.
  • the opening 1200 has an angular length of 90 °, which makes it possible to ensure the rotation from 0 ° (rest position) to 90 ° (brightening position) at the tool part 10, 11.
  • the sleeve 10 is guided linearly perpendicular to the grinding wheel. and over its entire width: the corundum stick 3 is actually translated parallel to the grinding wheel and is maintained pushed against it with the constant force of the cylinder during a brightening operation.
  • FIG. 3 shows a brightening assembly which is constituted in advance of its assembly in the tool part 10, 11 and prior to the actual brightening operation: this assembly comprises a corundum stick 3 and the piece 4 in which the stick 3 is fitted with tightening at the end 40.
  • This piece 4 can be molded on the corundum stick 3.
  • This piece 4 comprises at its other end a groove 41 for solidarity with the rod 110 cylinder 11 according to the tenon / mortise assembly mentioned above.
  • a gripping pin 42 is provided to allow the manual insertion of a new corundum stick in the groove of the sleeve 10 and its removal once worn.
  • the pin 42 may for example be glued into the piece 4.
  • FIG 4 is shown in perspective a brightening device 1 according to the invention as it is arranged in a grinding machine 5 without nuclear fuel pellets center itself arranged in a glove box. More precisely, the centerless grinding machine 5 comprises a grinding wheel 6 for advancing the pellets by rotation on themselves and a grinding wheel 2 arranged opposite the grinding wheel for grinding nuclear fuel pellets.
  • the brightening device 1 according to the invention is arranged close to the working grinding wheel 2 opposite the grinding wheel opposite the drive wheel 6.
  • the grinding wheel 2 is here confined by a cowling 22.
  • the glove box comprises an access hatch (not shown) usually intended for access to the grinding wheel.
  • the brightening device 1 is arranged in front of the access window to the grinding wheel: an operator, with his hands in the gloves of the glove box, can thus have access through the hatch to the lever 14 for manual locking, to the part tool 10, 11 of the device or any other element thereof.
  • the device according to the invention which has just been described may furthermore use other materials than corundum to brighten the grinding wheels. It may be any hardness material equivalent to corundum and capable of brightening a grinding wheel based on diamond grains, such as an abrasive based on aluminum oxide, silicon carbide or quartz. ..

Abstract

The invention relates to a dressing device (1) for a grinding wheel (2), including a sleeve (10) for laterally holding and guiding, along the horizontal axis (X) thereof, a corundum rod (3), a ram (11) for applying a constant pressing force to the corundum rod (3) held and guided in the sleeve (10) against the grinding wheel (2), means (4, 40, 41) for rigidly connecting the ramrod (110) to the end of the corundum rod, and linear guide means (13) for the sleeve for translating the corundum rod parallel to the axis (y) of the grinding wheel while keeping said rod pressed against the latter with a constant force. The invention can be used in a centerless grinder (5) in which the grinding wheel (2) has the function of grinding nuclear fuel pellets.

Description

DISPOSITIF D'AVIVAGE DE MEULE DE TRAVAIL ET SON UTILISATION DANS UNE RECTIFIEUSE SANS CENTRE DE PASTILLES DE COMBUSTIBLE NUCLEAIRE  WORKING WHEEL ADVANTAGE DEVICE AND USE THEREOF IN A RECTIFIER WITHOUT A NUCLEAR FUEL PELLET CENTER
DESCRIPTION DESCRIPTION
DOMAINE TECHNIQUE TECHNICAL AREA
L'invention concerne un dispositif d'avivage de meule de rectification ou meule de travail, à base de grains de diamant. The invention relates to a device for brightening grinding wheel or grinding wheel, based on diamond grains.
Elle vise plus particulièrement à améliorer l'efficacité et la fiabilité de l'avivage.  It is particularly aimed at improving the efficiency and reliability of brightening.
Elle trouve une utilisation particulièrement intéressante dans une rectifieuse sans centre dans laquelle la meule de travail a pour fonction de rectifier le diamètre des pastilles de combustible nucléaire.  It finds a particularly interesting use in a centerless grinding machine in which the grinding wheel has the function of grinding the diameter of the nuclear fuel pellets.
ART ANTÉRIEUR PRIOR ART
La rectification sans centre est un procédé de meulage avantageux connu pour la rectification de pièces cylindriques, en particulier pour les pastilles de combustible nucléaire. Centerless grinding is a known grinding process known for the grinding of cylindrical workpieces, particularly for nuclear fuel pellets.
Une rectifieuse sans centre comprend usuellement deux meules dont l'une est une meule d ' entraînement , qui sert à la mise en rotation des pastilles sur elles mêmes en les faisant avancer sur un rail de guidage, appelé règle d'enfilade dans le cas des pastilles de combustible nucléaire, et l'autre est une meule de travail et a pour fonction d'usiner, c'est-à-dire rectifier le diamètre des pastilles. Une meule de travail comprend usuellement à sa périphérie, en tant qu'éléments de meulage, des bandeaux à base de diamants fixés par un liant métallique ou une résine. Dans le cas des meules de travail pour les pastilles de combustible nucléaire, il existe trois types de bandeaux: l'un pour l'ébauche, un autre pour la semi-finition et le dernier pour la finition des pastilles. A centerless grinding machine usually comprises two grinding wheels, one of which is a grinding wheel, which is used to rotate the pellets on themselves by moving them on a guide rail, called the enfilade rule in the case of nuclear fuel pellets, and the other is a working wheel and has the function of machining, that is to say rectify the diameter of the pellets. A grinding wheel usually comprises at its periphery, as grinding elements, diamond-based bands attached by a metal binder or a resin. In the case of grinding wheels for nuclear fuel pellets, there are three types of strips: one for roughing, another for semi-finishing and the last for finishing pellets.
L'efficacité de l'usinage de la meule de travail dépend de l'état des diamants et de son encrassement. Pour redonner du mordant à la meule de travail, il est nécessaire de réaliser un avivage à l'aide de bâtons de corindon.  The efficiency of machining the grinding wheel depends on the condition of the diamonds and its fouling. To give teeth to the grinding wheel, it is necessary to perform a sharpening using corundum sticks.
Usuellement, pour les meules de travail dans les rectifieuses sans centre des pastilles de combustible nucléaire, 1 ' avivage est fait à la main. Ainsi, un opérateur insère un bâton de corindon avec un outil par la trappe d'accès à l'arrière d'un bâti dans lequel la rectifieuse est agencée. L'opérateur tente alors de positionner au mieux le bâton de corindon, c'est-à-dire le plus proche de la perpendiculaire à la meule de travail. Un léger effort tributaire de et apporté par la pression manuelle de l'opérateur est ainsi appliqué par le bâton de corindon sur la meule de travail. Tout en appliquant cet effort, l'opérateur tente de déplacer au mieux le bâton de corindon sur toute la largeur de la meule. Pour réaliser une opération d'avivage jugée satisfaisante, l'opérateur pouvait consommer jusqu'à environ dix bâtons de corindon. Cette opération peut comporter en outre un risque important pour l'opérateur ainsi que des risques d ' endommagement de la meule de travail par rupture d'un bâton de corindon dans le bâti. L'outil d'avivage de la meule de travail a été développé pour éviter ces risques et améliorer 1 ' avivage . Usually, for grinding wheels in the centerless grinders of the nuclear fuel pellets, the brightening is done by hand. Thus, an operator inserts a corundum stick with a tool through the access door at the rear of a frame in which the grinder is arranged. The operator then tries to position at best the corundum stick, that is to say, the closest to the perpendicular to the grinding wheel. A small effort dependent on and brought by the manual pressure of the operator is thus applied by the corundum stick on the grinding wheel. While applying this effort, the operator tries to move at best the corundum stick over the entire width of the wheel. To perform a brightening operation deemed satisfactory, the operator could consume up to about ten sticks of corundum. This operation may also involve a significant risk for the operator as well as risks damage to the grinding wheel by breaking a corundum stick in the frame. The grinding tool of the grinding wheel has been developed to avoid these risks and to improve brightening.
Par ailleurs, il serait souhaitable d'améliorer encore la qualité d'avivage d'une meule de travail .  Furthermore, it would be desirable to further improve the brightening quality of a working wheel.
Ainsi, le but général de l'invention est l'amélioration de la qualité d'avivage de la meule de travail, et donc des pièces rectifiées, plus particulièrement des pastilles de combustibles nucléaire .  Thus, the general object of the invention is the improvement of the brightening quality of the working wheel, and therefore of the ground parts, more particularly nuclear fuel pellets.
Un but particulier est de réduire les risques encourus par un opérateur en charge de 1 'avivage manuellement selon l'état de l'art et les risques d ' endommagement encourus par la meule de travail .  A particular aim is to reduce the risks incurred by an operator in charge of the brightening manually according to the state of the art and the risks of damage incurred by the grinding wheel.
EXPOSÉ DE L ' INVENTION STATEMENT OF THE INVENTION
Pour ce faire, l'invention a pour objet un dispositif d'avivage d'une meule de travail qui, selon l'invention, comprend essentiellement un fourreau pour maintenir latéralement et guider selon son axe longitudinal un bâton de corindon, un vérin pour appliquer un effort constant de poussée du bâton de corindon contre la meule de travail, des moyens de solidarisâtion de la tige de vérin à l'extrémité d'un bâton de corindon, et des moyens de guidage linéaire du fourreau pour faire translater le bâton de corindon parallèlement à l'axe de la meule de travail en le maintenant poussé contre celle-ci avec le même effort constant . Ainsi, le dispositif d'avivage selon l'invention minimise les risques et rend 1 ' avivage plus efficace, plus précis et plus fiable. Le dispositif d'avivage selon l'invention augmente la durée de vie d'une meule de travail et améliore la qualité des pièces rectifiées par celle-ci telles que des pastilles de combustible nucléaire. To do this, the subject of the invention is a device for brightening a grinding wheel which, according to the invention, essentially comprises a sheath for holding laterally and guiding a corundum stick, a jack for applying, along its longitudinal axis. a constant thrust force of the corundum stick against the working wheel, means of solidarization of the cylinder rod at the end of a corundum stick, and linear guide means of the sleeve for translating the corundum stick parallel to the axis of the grinding wheel by holding it pushed against it with the same constant effort. Thus, the brightening device according to the invention minimizes the risks and makes brightening more efficient, more precise and more reliable. The brightening device according to the invention increases the life of a grinding wheel and improves the quality of the parts ground by it such as nuclear fuel pellets.
Selon un mode de réalisation, le fourreau comprend une rainure ouverte vers le haut et de section transversale à son axe longitudinal en forme de U.  According to one embodiment, the sheath comprises an upwardly open groove of cross section with respect to its U-shaped longitudinal axis.
Avantageusement, il est prévu trois galets de guidage du bâton de corindon montés dans le fourreau sensiblement à une même côte longitudinale, deux des galets étant en regard l'un de l'autre et montés chacun sur une branche du U de la rainure et le troisième étant monté sur le haut du U de la rainure, l'espace entre les galets et le fond du U de la rainure étant de dimensions correspondant aux dimensions transversales nominales du bâton de corindon. Les galets facilitent ainsi le guidage du bâton de corindon, réduisent les frottements et assurent une fonction anti-vibration du bâton de corindon dans le fourreau.  Advantageously, there are three guide rollers corundum stick mounted in the sleeve substantially at the same longitudinal side, two of the rollers being opposite one another and each mounted on a branch of the U of the groove and the third being mounted on the top of the U of the groove, the space between the rollers and the bottom of the U of the groove being of dimensions corresponding to the nominal transverse dimensions of the corundum stick. The rollers thus facilitate the guiding of the corundum stick, reduce friction and provide an anti-vibration function of the corundum stick in the sheath.
Le vérin est de préférence un vérin double- effet pour permettre en outre la mise à distance du bâton de corindon de la meule de travail.  The cylinder is preferably a double-acting cylinder to further allow the distance of the corundum stick from the grinding wheel.
Le vérin est de préférence encore un vérin pneumatique régulé par un détendeur de pression. La pression d'un vérin pneumatique régulée permet de garantir un avivage efficace sans trop de pression sur la meule à aviver. Les moyens de guidage linéaire sont constitués de préférence par des rails à fonctionnement à sec. Ainsi, dans un environnement de boite à gants, un guidage linéaire de type à sec permet d'éviter la présence d'un modérateur dans la boîte à gants, c'est- à-dire d'éviter d'avoir un risque de criticité supplémentaire et d'éviter la pollution par ledit modérateur des pièces à rectifier, telles que les pastilles de combustible nucléaire. The jack is preferably still a pneumatic cylinder regulated by a pressure regulator. The pressure of a pneumatic cylinder regulated ensures an effective brightening without much pressure on the grinding wheel. The linear guide means are preferably constituted by dry running rails. Thus, in a glove box environment, dry-type linear guiding makes it possible to avoid the presence of a moderator in the glove box, that is to say to avoid having a risk of criticality. additional and avoid pollution by said moderator of the parts to be rectified, such as nuclear fuel pellets.
Le dispositif selon l'invention peut comprendre deux butées de fin de course des moyens de guidage linéaire pour limiter le déplacement du bâton de corindon à la largeur de la meule de travail.  The device according to the invention may comprise two end stops of the linear guide means for limiting the displacement of the corundum stick to the width of the working wheel.
Le dispositif comprend avantageusement un chariot en deux parties pivotantes l'une par rapport à l'autre, la partie inférieure du chariot étant guidée en permanence par les moyens de guidage linéaire, la partie supérieure du chariot pivotant entre une position de repos dans laquelle le fourreau est sensiblement parallèle à l'axe de la meule de travail et une position d'avivage dans laquelle le fourreau est sensiblement perpendiculaire à l'axe de la meule de travail .  The device advantageously comprises a carriage in two parts pivotable relative to each other, the lower part of the carriage being permanently guided by the linear guide means, the upper part of the pivoting carriage between a rest position in which the sleeve is substantially parallel to the axis of the grinding wheel and a brightening position in which the sleeve is substantially perpendicular to the axis of the grinding wheel.
Un levier de verrouillage manuel du pivotement de la partie supérieure du chariot peut être prévu .  A lever for manually locking the pivoting of the upper part of the carriage can be provided.
L'invention concerne également un ensemble d'avivage, destiné à être utilisé pour l 'avivage d'une meule de travail, comprenant un bâton de corindon et une pièce, une extrémité de la pièce étant moulée sur la bâton de corindon, la pièce comprenant à l'autre de ses extrémités une gorge formant mortaise adaptée pour loger la tige de vérin du dispositif précédemment décrit, formant tenon en constituant un assemblage à queue d'aronde entre le tenon et la mortaise. Ainsi, avec une telle solidarisâtion entre le bâton de corindon et le vérin, on peut avoir une mise à distance du bâton de corindon de la meule de travail par le vérin double-effet. The invention also relates to a brightening assembly for use in brightening a work wheel, comprising a corundum stick and a workpiece, one end of the workpiece being molded on the corundum stick, the workpiece including to the other its ends a mortise groove adapted to house the cylinder rod of the device described above, forming a tenon constituting a dovetail assembly between the post and the mortise. Thus, with such solidarization between the corundum stick and the jack, one can have a distance of the corundum stick of the grinding wheel by the double-acting cylinder.
La pièce peut comprendre un pion de préhension pour permettre l'introduction manuelle du bâton de corindon dans le fourreau lorsqu'il est neuf et son enlèvement manuel une fois usé.  The piece may include a gripping pin to allow manual insertion of the corundum stick into the sleeve when new and its manual removal once worn.
L'invention concerne également une rectifieuse sans centre de pièces comprenant une meule d'entraînement pour faire avancer les pièces et une meule de travail agencée en regard de la meule d'entraînement pour rectifier lesdites pièces et un dispositif d'avivage de meule de travail décrit précédemment et agencé à proximité de la meule de travail en regard de celle-ci à l'opposé de la meule d ' entraînement .  The invention also relates to a centerless grinding machine comprising a grinding wheel for advancing the workpieces and a grinding wheel arranged next to the grinding wheel for grinding said workpieces and a work grinding device. described above and arranged near the grinding wheel facing it opposite the grinding wheel.
La rectifieuse sans centre est parfaitement adaptée à la rectification de pastilles de combustible nucléaire . BRÈVE DESCRIPTION DES DESSINS  The centerless grinding machine is ideally suited for grinding nuclear fuel pellets. BRIEF DESCRIPTION OF THE DRAWINGS
D'autres avantages et caractéristiques ressortiront mieux à la lecture de la description détaillée faite ci-dessous en référence aux figures suivantes parmi lesquelles : - la figure 1 une vue de dessus d'un dispositif d'avivage selon l'invention dans une configuration installée à proximité d'une meule de travail à aviver avec un bâton de corindon solidarisé, Other advantages and characteristics will become more apparent on reading the detailed description given below with reference to the following figures among which: - Figure 1 a top view of a brightening device according to the invention in a configuration installed near a work grinding wheel to brighten with a corundum stick secured,
- la figure 2 est une vue en coupe longitudinale du dispositif selon la figure 1,  FIG. 2 is a view in longitudinal section of the device according to FIG. 1;
- les figures 2A et 2B sont des vues de détail de la figure 2,  FIGS. 2A and 2B are detailed views of FIG. 2,
- la figure 3 montre un ensemble d'avivage avec un bâton de corindon conforme à l'invention.  - Figure 3 shows a set of brightening with a corundum stick according to the invention.
- la figure 4 est une vue en perspective d'un dispositif d'avivage selon l'invention implantée dans une rectifieuse sans centre de pastilles de combustible nucléaire dans une boite à gants. EXPOSÉ DÉTAILLÉ DE MODES DE RÉALISATION PARTICULIERS  - Figure 4 is a perspective view of a brightening device according to the invention implanted in a grinding machine without nuclear fuel pellets center in a glove box. DETAILED PRESENTATION OF PARTICULAR EMBODIMENTS
Les termes « inférieur », « supérieur », « en dessous » et « au dessus » sont à considérer dans la configuration installée du dispositif d'avivage 1 et d'un bâton de corindon, c'est-à-dire avec ce dernier sensiblement à l'horizontale. The terms "lower", "upper", "below" and "above" are to be considered in the installed configuration of the brightener 1 and a corundum stick, that is to say with the latter substantially horizontally.
Le dispositif d'avivage 1 selon l'invention est représenté en configuration installée à proximité d'une meule de travail 2 à aviver.  The brightening device 1 according to the invention is shown in configuration installed near a grinding wheel 2 to be brightened.
Tel que représenté, le dispositif 1 est fixé par des vis 21 au bâti 20 supportant la meule de travail .  As shown, the device 1 is fixed by screws 21 to the frame 20 supporting the grinding wheel.
Le dispositif d'avivage 1 comprend tout d'abord un fourreau 10 pour maintenir latéralement et guider selon son axe longitudinal X un bâton de corindon 3. Comme représenté, le fourreau 10 comprend une rainure ouverte vers le haut et de section transversale à son axe longitudinal en forme de U. The brightening device 1 comprises, first of all, a sheath 10 for holding laterally and guiding along its longitudinal axis X a stick of corundum 3. As shown, the sheath 10 comprises an upwardly open groove of cross-section with respect to its U-shaped longitudinal axis.
Comme visible sur la figure 2B, trois galets 100, 101, 102 de guidage du bâton de corindon 3 sont montés dans le fourreau 10 sensiblement à une même côte longitudinale, à son extrémité la plus proche de la meule de travail à aviver 2. Plus exactement, un galet 100 est monté sur le haut du U de la rainure du fourreau et les deux autres 101, 102 sont en regard l'un de l'autre et montés chacun sur une branche du U de la rainure. L'espace ainsi défini entre les galets 100, 101, 102 et le fond 10 A du U de la rainure est de dimensions correspondant aux dimensions transversales nominales du bâton de corindon 3 (figure 2B) .  As can be seen in FIG. 2B, three rollers 100, 101, 102 for guiding the corundum stick 3 are mounted in the sleeve 10 at substantially the same longitudinal edge, at its end which is closest to the working wheel to be sharpened. exactly, a roller 100 is mounted on the top of the U of the groove of the sleeve and the other two 101, 102 are facing each other and each mounted on a branch of the U of the groove. The space thus defined between the rollers 100, 101, 102 and the bottom 10 A of the U of the groove is of dimensions corresponding to the nominal transverse dimensions of the corundum stick 3 (FIG. 2B).
Le dispositif 1 comprend également un vérin pneumatique à double effet 11 pour appliquer un effort constant de poussée du bâton de corindon 3 maintenu et guidé dans le fourreau 10 contre la meule de travail 2.  The device 1 also comprises a double-acting pneumatic cylinder 11 for applying a constant thrust force of the corundum stick 3 held and guided in the sleeve 10 against the working grindwheel 2.
La solidarisâtion de la tige 110 de vérin au bâton de corindon 3 est réalisée par un système tenon/mortaise. Plus exactement, il est prévu une pièce intermédiaire de solidarisâtion 4 entre le bâton de corindon 3 et la tige de vérin 11. Tel qu'illustré de manière plus visible en figure 3, une extrémité 40 de la pièce 4 étant moulée sur la bâton de corindon 3. Cette pièce 4 comprend à l'autre de ses extrémités une gorge 41 formant mortaise adaptée pour loger la tige de vérin 110 formant tenon en constituant un assemblage à queue d'aronde entre le tenon et la mortaise. La pièce 4 intermédiaire comprend en outre un pion de préhension 42 qui permet l'introduction manuelle d'un bâton de corindon 3 neuf dans le fourreau 10 et son enlèvement une fois usé. Solidarisâtion of the rod 110 of cylinder corundum stick 3 is achieved by a tenon / mortise system. More exactly, an intermediate solidarity piece 4 is provided between the corundum stick 3 and the jack rod 11. As shown more clearly in FIG. 3, an end 40 of the piece 4 being molded on the stick of corundum 3. This piece 4 comprises at the other of its ends a groove 41 forming mortise adapted to accommodate the rod 110 cylinder forming tenon constituting a dovetail assembly between the tenon and the mortise. The intermediate part 4 further comprises a gripping pin 42 which allows the manual introduction of a new corundum stick 3 in the sleeve 10 and its removal once worn.
Le fourreau 10 et le vérin à double effet 11 sont montés sur la partie supérieure 120 d'un chariot 12.  The sheath 10 and the double-acting jack 11 are mounted on the upper part 120 of a carriage 12.
Ce chariot 12 est en deux parties 120, 121 pivotantes l'une par rapport à l'autre. La partie inférieure 121 du chariot est montée coulissante en permanence sur des rails 13 de guidage linéaire qui sont parallèles à l'axe Y de la meule de travail 2. Le guidage linéaire sert à déplacer le fourreau 10 sur toute la largeur de la meule de travail 2 sans variation de la distance entre le fourreau 10 en position d'avivage et la meule 2. Le guidage réalisé par les rails est de préférence à sec, lorsque l'avivage est réalisé dans un environnement contraignant, telle qu'une boite à gants d'une rectifieuse sans centre de pastilles de combustible nucléaire: on évite ainsi la présence d'un modérateur dans la boîte à gants (un risque de criticité) et la pollution des pastilles.  This carriage 12 is in two parts 120, 121 pivoting relative to each other. The lower portion 121 of the carriage is slidably mounted permanently on linear guide rails 13 which are parallel to the Y axis of the grinding wheel 2. The linear guide serves to move the sleeve 10 over the entire width of the grinding wheel. work 2 without variation of the distance between the sleeve 10 in the brightening position and the grinding wheel 2. The guidance provided by the rails is preferably dry, when the brightening is performed in a constraining environment, such as a box gloves of a grinding machine without center of nuclear fuel pellets: this avoids the presence of a moderator in the glove box (a risk of criticality) and the pollution of the pellets.
La partie supérieure 120 du chariot 12 est pivotante entre une position de repos dans laquelle le fourreau 10 est sensiblement parallèle à l'axe Y de la meule de travail 2 et une position d'avivage telle que montrée en figures 1, 2, 3 dans laquelle le fourreau 10 est sensiblement perpendiculaire à l'axe de la meule de travail 2. Ainsi, dans le mode de réalisation illustré, le fourreau 10 peut pivoter d'un angle de 90°.  The upper portion 120 of the carriage 12 is pivotable between a rest position in which the sheath 10 is substantially parallel to the Y axis of the grinding wheel 2 and a brightening position as shown in FIGS. 1, 2, 3 in FIG. which the sleeve 10 is substantially perpendicular to the axis of the grinding wheel 2. Thus, in the illustrated embodiment, the sleeve 10 can rotate by an angle of 90 °.
En d'autres termes, avec le dispositif d'avivage, on peut faire prendre deux positions à la partie outil, à proprement parler, du dispositif d'avivage constituée par le fourreau 10 et le vérin double effet 11 : In other words, with the brightening device, two positions can be taken to the tool part, strictly speaking, of the brightening device constituted by the sheath 10 and the double-acting cylinder 11:
- la position de repos, dans laquelle l'axe du fourreau X et l'axe de la meule Y de travail 2 sont parallèles : cette position est utilisée lors du changement de bâtons de corindon usés,  the rest position, in which the axis of the sheath X and the axis of the grinding wheel Y are parallel: this position is used when changing spent corundum sticks,
- la position d'avivage, dans laquelle l'axe du fourreau X et l'axe Y de la meule de travail 2 sont perpendiculaires.  - The brightening position, in which the axis of the sheath X and the Y axis of the grinding wheel 2 are perpendicular.
Le pivotement entre les deux parties 120, 121 du chariot 12 est verrouillé par le serrage d'un levier de verrouillage 14. Ce levier de verrouillage 14 comporte une vis 140 fixée sur la partie supérieure 120 du chariot 12 et une poignée indexable 141 qui assure le maintien en position dans chacune des deux positions (repos et avivage) de la partie outil 10, 11. La partie outil 10, 11 pivote par desserrage du levier de verrouillage 14 et donc de la vis 140 puis par coulissement de celle-ci dans une ouverture 1200 réalisée sur la partie supérieure 120 du chariot 12. L'ouverture 1200 a une longueur angulaire de 90°, ce qui permet d'assurer la rotation de 0° (position de repos) à 90° (position d'avivage) à la partie outil 10, 11.  Pivoting between the two parts 120, 121 of the carriage 12 is locked by the tightening of a locking lever 14. This locking lever 14 comprises a screw 140 fixed on the upper part 120 of the carriage 12 and an indexable handle 141 which ensures maintaining in position in each of the two positions (rest and brightening) of the tool part 10, 11. The tool part 10, 11 pivots by loosening the locking lever 14 and therefore the screw 140 and then sliding it in an opening 1200 made on the upper part 120 of the carriage 12. The opening 1200 has an angular length of 90 °, which makes it possible to ensure the rotation from 0 ° (rest position) to 90 ° (brightening position) at the tool part 10, 11.
Ainsi, avec les rails de guidage 13 agencés parallèlement à l'axe Y de la meule de travail 2 et la partie outil 10, 11 pivotée dans sa position d'avivage, le fourreau 10 est guidé linéairement à la perpendiculaire de la meule de travail et sur toute sa largeur : le bâton de corindon 3 est de fait translaté parallèlement à la meule de travail et est maintenu poussé contre celle-ci avec l'effort constant du vérin lors d'une opération d'avivage. Thus, with the guide rails 13 arranged parallel to the Y axis of the grinding wheel 2 and the tool part 10, 11 pivoted in its brightening position, the sleeve 10 is guided linearly perpendicular to the grinding wheel. and over its entire width: the corundum stick 3 is actually translated parallel to the grinding wheel and is maintained pushed against it with the constant force of the cylinder during a brightening operation.
Des vis non décrites sont fixées de chaque coté du chariot inférieur 121 et ont pour fonction de régler le déplacement de la partie outil 10, 11 du dispositif 1 par rapport à la meule de travail 2, ce qui garantit qu'un bâton de corindon 3 ne dépasse pas le bord de la meule de travail 2 à aviver.  Undescribed screws are fixed on each side of the lower carriage 121 and their function is to adjust the movement of the tool part 10, 11 of the device 1 with respect to the working grinding wheel 2, which guarantees that a corundum stick 3 do not exceed the edge of the grinding wheel 2 to be brightened.
En figure 3, on a représenté un ensemble d'avivage qui est constitué au préalable de son montage dans la partie outil 10, 11 et au préalable de l'opération d'avivage proprement dite: cet ensemble comprend un bâton de corindon 3 et la pièce 4 dans laquelle le bâton 3 est ajusté avec serrage à l'extrémité 40. Cette pièce 4 peut être moulée sur le bâton de corindon 3. Cette pièce 4 comprend à son autre extrémité une gorge 41 permettant la solidarisâtion avec la tige 110 de vérin 11 selon l'assemblage tenon/mortaise mentionné ci-dessus. Enfin, un pion de préhension 42 est prévu pour permettre l'insertion manuelle d'un bâton de corindon neuf dans la rainure du fourreau 10 et son enlèvement une fois usé. Le pion 42 peut par exemple être emmanché collé dans la pièce 4.  FIG. 3 shows a brightening assembly which is constituted in advance of its assembly in the tool part 10, 11 and prior to the actual brightening operation: this assembly comprises a corundum stick 3 and the piece 4 in which the stick 3 is fitted with tightening at the end 40. This piece 4 can be molded on the corundum stick 3. This piece 4 comprises at its other end a groove 41 for solidarity with the rod 110 cylinder 11 according to the tenon / mortise assembly mentioned above. Finally, a gripping pin 42 is provided to allow the manual insertion of a new corundum stick in the groove of the sleeve 10 and its removal once worn. The pin 42 may for example be glued into the piece 4.
En figure 4, est représenté en perspective un dispositif d'avivage 1 selon l'invention tel qu'il est agencé dans une rectifieuse 5 sans centre de pastilles de combustible nucléaire elle-même agencée dans une boite à gants. Plus exactement, la rectifieuse sans centre 5 comprend une meule d'entraînement 6 pour faire avancer les pastilles par rotation sur elles- mêmes et une meule de travail 2 agencée en regard de la meule d'entraînement pour rectifier les pastilles de combustible nucléaire. Le dispositif d'avivage 1 selon l'invention est agencé à proximité de la meule de travail 2 en regard de celle-ci à l'opposé de la meule d'entraînement 6. In Figure 4, is shown in perspective a brightening device 1 according to the invention as it is arranged in a grinding machine 5 without nuclear fuel pellets center itself arranged in a glove box. More precisely, the centerless grinding machine 5 comprises a grinding wheel 6 for advancing the pellets by rotation on themselves and a grinding wheel 2 arranged opposite the grinding wheel for grinding nuclear fuel pellets. The brightening device 1 according to the invention is arranged close to the working grinding wheel 2 opposite the grinding wheel opposite the drive wheel 6.
La meule de travail 2 est ici confinée par un capotage 22. La boite à gants comprend une trappe d'accès (non représentée) destinée usuellement à l'accès à la meule de travail. Le dispositif d'avivage 1 est agencé devant la fenêtre d'accès à la meule : un opérateur, avec les mains dans les gants de la boîte à gants, peut ainsi avoir accès par la trappe au levier 14 de verrouillage manuel, à la partie outil 10, 11 du dispositif ou à tout autre élément de ce dernier.  The grinding wheel 2 is here confined by a cowling 22. The glove box comprises an access hatch (not shown) usually intended for access to the grinding wheel. The brightening device 1 is arranged in front of the access window to the grinding wheel: an operator, with his hands in the gloves of the glove box, can thus have access through the hatch to the lever 14 for manual locking, to the part tool 10, 11 of the device or any other element thereof.
Bien que décrite en référence à l'application dans une rectifieuse sans centre pour la rectification de pastilles de combustible nucléaire, on peut envisager l'utilisation du dispositif d'avivage pour toutes applications qui nécessitent un avivage fiable et efficace de meules de travail.  Although described with reference to the application in a centerless grinding machine for the grinding of nuclear fuel pellets, the use of the brightening device can be envisaged for all applications that require reliable and efficient brightening of grinding wheels.
Le dispositif selon l'invention qui vient d'être décrit peut en outre utiliser d'autres matériaux que le corindon pour aviver les meules de travail. Il peut s'agir de tout matériau de dureté équivalente au corindon et susceptible d'aviver une meule à base de grains de diamant, tel qu'un abrasif à base d'oxyde d'aluminium, de carbure de silicium ou de quartz....  The device according to the invention which has just been described may furthermore use other materials than corundum to brighten the grinding wheels. It may be any hardness material equivalent to corundum and capable of brightening a grinding wheel based on diamond grains, such as an abrasive based on aluminum oxide, silicon carbide or quartz. ..

Claims

REVENDICATIONS
1. Dispositif d'avivage (1) de meule de travail (2), comprenant un fourreau (10) pour maintenir latéralement et guider selon son axe longitudinal X un bâton de corindon (3), un vérin (11) pour appliquer un effort constant de poussée du bâton de corindon maintenu et guidé dans le fourreau contre la meule de travail, des moyens de solidarisâtion (4, 40, 41) de la tige de vérin (110) à l'extrémité du bâton de corindon, et des moyens de guidage linéaire (13) du fourreau pour faire translater le bâton de corindon parallèlement à l'axe (Y) de la meule de travail en le maintenant poussé contre celle-ci avec l'effort constant.  1. A grinding device (1) for grinding wheel (2), comprising a sheath (10) for laterally holding and guiding along its longitudinal axis X a corundum stick (3), a jack (11) for applying a force constant thrust of the corundum stick held and guided in the sleeve against the grinding wheel, means for solidarisâtion (4, 40, 41) of the cylinder rod (110) at the end of the corundum stick, and means linear guide (13) of the sleeve for translating the corundum stick parallel to the axis (Y) of the grinding wheel by maintaining it pushed against it with constant effort.
2. Dispositif d'avivage (1) de meule de travail selon la revendication 1, dans lequel le fourreau comprend une rainure ouverte vers le haut et de section transversale à son axe longitudinal en forme de U. 2. grinding device (1) grinding wheel according to claim 1, wherein the sleeve comprises an upwardly open groove and of cross section to its longitudinal axis U-shaped.
3. Dispositif d'avivage (1) de meule de travail selon la revendication 2, comprenant trois galets (100, 101, 102) de guidage du bâton de corindon montés dans le fourreau sensiblement à une même côte longitudinale, deux (101, 102) des galets étant en regard l'un de l'autre et montés chacun sur une branche du U de la rainure et le troisième (100) étant monté sur le haut du U de la rainure, l'espace entre les galets et le fond du U de la rainure étant de dimensions correspondant aux dimensions transversales nominales du bâton de corindon. 3. Device for brightening (1) grinding wheel according to claim 2, comprising three rollers (100, 101, 102) for guiding the corundum stick mounted in the sheath substantially at the same longitudinal side, two (101, 102 ) rollers being opposite one another and each mounted on a branch of the U of the groove and the third (100) being mounted on the top of the U of the groove, the space between the rollers and the bottom the U of the groove being of dimensions corresponding to the nominal transverse dimensions of the corundum stick.
4. Dispositif d'avivage (1) de meule de travail selon l'une des revendications précédentes, dans lequel le vérin est un vérin double-effet. 4. A grinding device (1) grinding wheel according to one of the preceding claims, wherein the cylinder is a double-acting cylinder.
5. Dispositif d'avivage (1) de meule de travail selon l'une des revendications précédentes, dans lequel le vérin est un vérin pneumatique régulé par un détendeur de pression. 5. grinding device (1) grinding wheel according to one of the preceding claims, wherein the cylinder is a pneumatic cylinder regulated by a pressure regulator.
6. Dispositif d'avivage (1) de meule de travail selon l'une des revendications précédentes, dans lequel les moyens de guidage linéaire sont constitués par des rails (13) à fonctionnement à sec. 6. The grinding device (1) grinding wheel according to one of the preceding claims, wherein the linear guide means are constituted by rails (13) to dry operation.
7. Dispositif d'avivage de meule de travail selon l'une des revendications précédentes, comprenant deux butées de fin de course des moyens de guidage linéaire pour limiter le déplacement du bâton de corindon à la largeur de la meule de travail. 7. Grinding wheel brightener according to one of the preceding claims, comprising two end stops of the linear guide means for limiting the displacement of the corundum stick to the width of the grinding wheel.
8. Dispositif d'avivage (1) de meule de travail selon l'une des revendications précédentes, comprenant un chariot (12) en deux parties (120, 121) pivotantes l'une par rapport à l'autre, la partie inférieure (121) du chariot étant guidée en permanence par les moyens de guidage linéaire, la partie supérieure (120) du chariot pivotant entre une position de repos dans laquelle le fourreau est sensiblement parallèle à l'axe de la meule de travail et une position d'avivage dans laquelle le fourreau est sensiblement perpendiculaire à l'axe de la meule de travail . Work grinding device (1) according to one of the preceding claims, comprising a carriage (12) in two parts (120, 121) pivoting relative to one another, the lower part ( 121) of the carriage being permanently guided by the linear guide means, the upper part (120) of the pivoting carriage between a rest position in which the sleeve is substantially parallel to the axis of the working wheel and a position of brightening in which the sheath is substantially perpendicular to the axis of the grinding wheel.
9. Dispositif d'avivage (1) de meule de travail selon la revendication 8, comprenant un levier de verrouillage (14) manuel du pivotement de la partie supérieure du chariot. 9. A grinding device (1) grinding wheel according to claim 8, comprising a manual locking lever (14) of the pivoting of the upper part of the carriage.
10. Ensemble d'avivage, destiné à être utilisé pour 1 'avivage d'une meule de travail, comprenant un bâton de corindon (3) et une pièce (4), une extrémité (40) de la pièce (4) étant moulée sur la bâton de corindon (3), la pièce (4) comprenant à l'autre de ses extrémités une gorge (41) formant mortaise adaptée pour loger la tige de vérin du dispositif selon l'une des revendications précédentes, formant tenon en constituant un assemblage à queue d'aronde entre le tenon et la mortaise. 10. A brightening assembly, for use in brightening a work grinding wheel, comprising a corundum stick (3) and a workpiece (4), one end (40) of the workpiece (4) being molded on the corundum stick (3), the piece (4) comprising at the other of its ends a groove (41) forming a mortise adapted to accommodate the actuator rod of the device according to one of the preceding claims, forming component tenon a dovetail joint between the tenon and the mortise.
11. Ensemble d'avivage selon la revendication 10, dans lequel la pièce (4) comprend un pion de préhension (42) . 11. brightening assembly according to claim 10, wherein the piece (4) comprises a gripping pin (42).
12. Rectifieuse sans centre (5) de pièces comprenant une meule d'entraînement (6) pour faire avancer les pièces et une meule de travail (2) agencée en regard de la meule d'entraînement pour rectifier lesdites pièces et un dispositif d'avivage (1) de meule de travail selon l'une des revendications précédentes et agencé à proximité de la meule de travail en regard de celle-ci à l'opposé de la meule d'entraînement. 12. Centreless center grinding machine (5) comprising a grinding wheel (6) for advancing the workpieces and a grinding wheel (2) arranged opposite the grinding wheel for grinding said workpieces and a grinding device. brightening (1) grinding wheel according to one of the preceding claims and arranged near the grinding wheel facing it opposite the grinding wheel.
13. Rectifieuse sans centre (5) selon la revendication 12, adaptée à la rectification de pastilles de combustible nucléaire. 13. Centreless grinding machine (5) according to claim 12, adapted for grinding nuclear fuel pellets.
EP20110735449 2010-07-27 2011-07-25 Device for dressing a grinding wheel, and use thereof in a centerless grinder for nuclear fuel pellets Active EP2598288B1 (en)

Applications Claiming Priority (2)

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FR1056137A FR2963268B1 (en) 2010-07-27 2010-07-27 WORKING WHEEL ADVANTAGE DEVICE AND USE THEREOF IN A RECTIFIER WITHOUT A NUCLEAR FUEL PELLET CENTER
PCT/EP2011/062746 WO2012013633A1 (en) 2010-07-27 2011-07-25 Device for dressing a grinding wheel, and use thereof in a centerless grinder for nuclear fuel pellets

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EP2598288B1 EP2598288B1 (en) 2014-09-17

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CN103124616B (en) 2015-06-10
RU2581939C2 (en) 2016-04-20
RU2013108445A (en) 2014-09-10
CN103124616A (en) 2013-05-29
FR2963268A1 (en) 2012-02-03
EP2598288B1 (en) 2014-09-17
FR2963268B1 (en) 2015-03-13
JP2013535346A (en) 2013-09-12
WO2012013633A1 (en) 2012-02-02
US20130122789A1 (en) 2013-05-16
JP5842312B2 (en) 2016-01-13
US9022836B2 (en) 2015-05-05

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