EP2688741A1 - Press having improved support - Google Patents

Press having improved support

Info

Publication number
EP2688741A1
EP2688741A1 EP12711140.9A EP12711140A EP2688741A1 EP 2688741 A1 EP2688741 A1 EP 2688741A1 EP 12711140 A EP12711140 A EP 12711140A EP 2688741 A1 EP2688741 A1 EP 2688741A1
Authority
EP
European Patent Office
Prior art keywords
compensator
guide sleeve
retaining nut
radial
nut
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
EP12711140.9A
Other languages
German (de)
French (fr)
Other versions
EP2688741B1 (en
Inventor
Christophe Coudiere
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 Demantelement SAS
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 EP2688741A1 publication Critical patent/EP2688741A1/en
Application granted granted Critical
Publication of EP2688741B1 publication Critical patent/EP2688741B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/06—Platens or press rams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/02—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/06—Platens or press rams
    • B30B15/065—Press rams
    • B30B15/067—Press rams with means for equalizing the pressure exerted by a plurality of press rams

Definitions

  • the present invention relates to a press providing improved maintenance, for example a press intended for the manufacture of nuclear fuel pellets.
  • a press for the manufacture of nuclear fuel pellets comprises a table in which molding dies are made for pressing the nuclear fuel powder between two punches, a lower punch and an upper punch.
  • the upper punch moves in the die during pressing while the lower punch remains stationary.
  • the powder is for example formed from a mixture of plutonium oxide and uranium oxide.
  • the table has a plurality of dies etched simultaneously by a plurality of punches.
  • Each upper punch is carried by a compensator, itself mounted in a common support which is moved relative to the table by means of a jack.
  • the support is called "compensator housing”.
  • a compensator forms a piston, sealingly movable in a bore formed in the compensator housing. Pressurized oil is injected between the bottom of the piston and the bottom of the bore so as to urge the piston bearing the punch outwardly of the compensator housing.
  • the bores are interconnected, and the compensators are used to balance the oil pressure on the different punches.
  • Each compensator has a large diameter portion on which the oil pressure is applied, and a small diameter portion of which a free end carries the punch.
  • the large diameter portion has on its periphery seals.
  • the compensator is guided in the bore by a bushing surrounding the small diameter part.
  • the sleeve is itself held in the bore by a nut which is screwed into the bore of the compensator.
  • the bushing also, has seals on its outer periphery and on its inner periphery.
  • Reliable sealing of the compensator assembly is required to prevent contamination of the dies and the nuclear fuel powder. It is recalled that, for security reasons, the press is in a glove box; therefore, any intervention on it is long and tedious. In addition, a pollution of the powder causes discarding of the pellets.
  • the seals are then monitored regularly, which requires disassembly of the compensators. For this, the retaining nut is unscrewed, then the guide sleeve is removed and finally the compensator is extracted from its bore. It may happen that the guide sleeve remains stuck in the bore, it is then necessary to exert a tensile force on the sleeve, which can damage the bushing and the inside of the bore. In addition, this area is difficult to access, and in all cases the intervention is through a round of glove. The application of this important effort is carried out at arm's length. In addition, when reassembling the sleeve, it may appear damage to joints.
  • a guide sleeve and retaining nut assembly secured to one another axially, while providing axial play and radial clearance between the guide sleeve and the retaining nut so that to allow a self-centering of the sleeve in the bore and around the compensator, during the assembly, to avoid deterioration of the joints.
  • the bushing is free to rotate relative to the nut.
  • the present invention therefore relates to a guiding and holding assembly for a press compensator comprising: a guide bushing of the compensator in its bore, said guide sleeve being intended to be mounted around the compensator,
  • the guide sleeve being between a shoulder of the compensator and the retaining nut
  • the guide sleeve is surrounded by the retaining nut over part of its length
  • the securing means comprise at least two radial fingers housed in radial bores (made in the retaining nut and one of which radially inner end opens into an annular groove formed in the outer periphery of the guide sleeve, a radial clearance being provided between the radially inner end of the radial fingers and a radial bottom of the groove and an axial play being provided between side edges the radially inner end of the radial fingers and the lateral edges of the groove.
  • the radial fingers are held in position in the radial housings by means of pressure screws.
  • the pressure screws can be immobilized axially for example by means of a needle punch or a threadlock.
  • the end radially inner fingers advantageously has a reduced diameter.
  • the radial fingers are preferably three in number arranged at 120 ° from each other.
  • the guide sleeve may comprise in its inner periphery a guide segment of the compensator.
  • the retaining nut comprises, in a transverse face opposite to that in contact with the guiding bush, indentations intended to cooperate with indentations carried by a tool for exerting a tightening or loosening force on the holding nut.
  • the present invention also relates to a press comprising:
  • a punch holder adapted to be moved by a jack to bring the punches of the molding dies in a longitudinal direction
  • each compensator having a longitudinal axis and being sealingly mounted in a bore of the support, and having a first longitudinal end intended to undergo a pressure of hydraulic fluid and a second longitudinal end bearing the punch, said bores being in fluid communication with each other, and - Compensating guide and maintenance assemblies according to the present invention mounted in each of the bores.
  • the press forms, for example, a press for manufacturing nuclear fuel pellets.
  • a tool for mounting and dismounting the press compensator guiding and holding assembly according to the present invention, for clamping and loosening the compensator retaining nuts may have a longitudinal axis and has a central cavity open to a first end for receiving the second end of the compensator, said open end being bordered by an annular surface provided with indentations or protrusions corresponding to recesses protruding or recessed respectively to the housing of the nut, and a second end means for exerting a rotational force on the tool about its longitudinal axis.
  • the tool may have protruding indentations and the nut may have indentations.
  • the means for exerting a rotational force to the tool are formed for example by a fingerprint for the mounting and the angular immobilization of a lever on the tool, for example an imprint of polygonal shape recessed or protruding.
  • the side wall of the central housing is perforated.
  • the depth of the housing corresponds substantially to the length of the portion of the compensator projecting from the nut, or the length of the assembly formed by the portion of the compensator projecting from the nut and the punch.
  • FIG. 1 is a diagrammatic representation of a nuclear fuel pellet manufacturing press to which the present invention can be applied
  • FIG. 2 is a partial sectional view of a compensator casing provided with upper punches, adapted to the press of FIG. 1;
  • FIG. 3 is an enlarged view of a detail of FIG. 2;
  • FIG. 4A is a longitudinal sectional view of a mounting bushing and guide nut assembly represented alone, in a plane of section different from that of FIG. FIG. 3
  • FIG. 4B is a detail view of FIG. 4A
  • FIG. 4C is a cross-sectional view along the plane A-A of FIG. 4A.
  • FIGS. 5A and 5B are longitudinal sectional views of embodiments of tools for disassembly of the guide sleeve assembly and retaining nut.
  • the present invention applies to any type of hydraulic press and is not limited to the nuclear field. It is particularly advantageous in the areas where cleanliness is an important criterion, but also in all areas implementing presses, because of its simplified maintenance.
  • the press of FIG. 1 is housed in a confined enclosure 2, type glove box. It comprises a table 4 carrying the molding dies 6, mounted mobile along guide columns 8, a lower jack Vi to move the table 4, a fixed support 12 of lower punches 14 and a movable support 15 of upper punches 16 and displaceable by an upper cylinder Vs.
  • the support 15 forms the compensator casing and carries the compensators (not shown) and the upper punches 16.
  • the cylinders pass tightly through the walls of the enclosure 2.
  • FIG. 2 a detail view of the compensator housing 15 can be seen and in FIG. 3, a compensator alone can be seen mounted in its bore.
  • the compensator housing 15 is formed by a plate in which are machined bores 18, of longitudinal axis X, each of them receiving a compensator 20.
  • the bores 18 are through and are closed at one end, opposite to that by which the compensator leaves, by a plug 22.
  • Each bore 18 has a first portion of smaller diameter 18.1 and a second portion of larger diameter 18.2 connecting to the portion of smaller diameter 18.1 by an annular bearing surface 18.3.
  • the compensator 20 has a first portion of larger diameter 20.1 and a second portion of smaller diameter 20.2 connecting to the larger diameter portion by a shoulder 20.3.
  • the larger diameter portion 20.1 is received in the smaller diameter portion 18.1 of the bore 18.
  • the larger diameter portion 20.1 of the compensator 20 has a groove 24 receiving a seal 26 and two grooves 28 located on either side of the groove 24 and receiving guide rings 30.
  • the bottom of the larger diameter portion 20.1 of the compensator 20 comprises two bores 29 receiving two anti-rotation rods 31 fixed in the bottom of the bore 18.
  • each bore defines with the bottom of the compensator that it contains a chamber 19 to be filled with oil under pressure.
  • the chambers 19 of all the bores are in fluid communication with each other to allow the flow of oil between the chambers 19 and ensure the balancing of the pressures on the punches during the pressing step.
  • Pits 19 ( Figure 2) made in front of the compensator housing allow the filling of the bores.
  • a guide sleeve 32 is mounted in the larger diameter portion 18.2 of the bore 18 and abuts against the annular bearing surface 18.3.
  • the bushing 32 surrounds the smaller diameter portion 20.2 of the compensator 20.
  • the bushing has a large outer diameter portion 32.1 and a small outer diameter portion 32.2 connected by a shoulder 32.3.
  • the guide sleeve 32 has on its outer periphery two seals 34 and on its inner periphery two axially offset sealing means 35 and a guide segment 36 of the compensator.
  • the guide segment is mounted in the small outer diameter portion 32.2.
  • the sealing means 35 each comprise an O-ring mounted radially at the bottom of the groove and a sealing ring at the outlet of the groove and rubbing on the compensator. The ring is then pressed onto the compensator by the O-ring and the pressurized oil.
  • a retaining nut 38 is mounted in the larger diameter portion 18.2 of the bore 18 and bears against the shoulder 32.3 of the guide sleeve 32.
  • the retaining nut 38 has a large inner diameter portion 38.1 and a small inner diameter portion 38.2.
  • the retaining nut 38 is mounted around the sleeve 32 so that its large-diameter inner portion 38.1 surrounds the small outer diameter portion 32.2 of the guide sleeve 32.
  • the retaining nut 38 has a thread 40 on its outer periphery cooperating with a tapping of the portion of larger diameter 18.2.
  • the retaining nut carries on its inner periphery a seal 42, for example of the lip seal type rubbing on the smaller diameter portion 20.2 of the compensator.
  • a clearance is provided between the inner diameter of the large diameter portion 38.1 of the nut and the outer diameter of the small diameter portion of the bushing 32, so that the bushing is not forced into the nut.
  • FIG. 4A a sectional view of the guide sleeve assembly 32 and the retaining nut 38, represented alone along a plane of section different from that of FIG. 3, can be seen.
  • the bushing 32 and the nut are secured axially and radially to one another, while leaving an axial and radial clearance between the parts.
  • Solidarity means 44 with clearance are then provided between the sleeve 32 and the nut 38.
  • the solidarity means 44 comprise three radial holes 46 arranged at 120 ° from each other formed in the nut, made in the small inner diameter portion and opening in a groove 48 made in the periphery of small outer diameter portion 32.2 of the sleeve 32 and fingers 50, housed in the housing 46 and penetrating the groove 48.
  • the outer dimensions of the fingers and the dimensions of the groove 48 are chosen so that a radial clearance and axial play are assured.
  • the fingers 50 are slidably mounted in the housings 46.
  • the solidarity means may comprise two fingers, however the implementation of three fingers reduces the risk of biasing the nut relative to the sleeve.
  • the groove 48 avoids the need to angularly orient the nut relative to the sleeve.
  • the sleeve is not integral in rotation with the nut. Thus, during the tightening and loosening of the nut, the sleeve 32 does not rotate with the nut, which avoids soliciting the seals.
  • the transverse position of the fingers and thus the radial clearance are adjusted by pressure screws.
  • This piece offers the possibility of improving axial play.
  • the rotation of the pressure screws 52 is blocked in order to ensure a fixed position of the fingers over time, for example by means of the threadlocker or by means of a needle punch at the level tapping.
  • This definitive fixation makes it possible to fix the games permanently and in a very simple manner. This is made possible because during the life of the press, the bushing and the nut do not need to be separated.
  • the end of the fingers 50 penetrating into the annular groove 48 has an end having a reduced diameter section, which makes it possible to limit the size of the annular groove 48 and avoids inducing weak spots in the bushing 32.
  • This end With reduced diameter section provides non-binding guidance for the seals of the sleeve 32 during the introduction of the sleeve assembly 32 and nut 38 in the bore of the compensator housing. In the locked position, the clamping force is taken up by the surfaces in contact with the parts 32 and 38 at the bearing surface 57 in FIG. 4A.
  • an axial clearance between the sleeve 38 and the nut 37 is between 0.045 mm and 0.355 mm is provided.
  • the clamping is adjusted to keep a radial clearance between 0.05 mm and 0.139 mm.
  • FIGS. 5A and 5B tools specially adapted for tightening / loosening of the retaining nut 38 can be seen.
  • the tool 54 is adapted to tighten / loosen the retaining nut 38 when the punch is not mounted on the compensator 20.
  • the tool 54 comprises means for rotating the nut in a direction of tightening or loosening.
  • the tool 54 comprises, at a first longitudinal end, an annular face 56 provided with three fingers 58 projecting and extending longitudinally.
  • the fingers 58 are intended to penetrate into three corresponding housings 59 formed in one face of the retaining nut 38 oriented towards the outside of the bore 18.
  • the fingers 58 are for example formed by pins mounted in bores made in the transverse face 56.
  • the tool comprises at least two fingers and preferably at least three.
  • the tool 54 also comprises a central cavity 60 bordered by the annular face 56; the cavity 60 is intended to receive the projecting end of the compensator 20.
  • the tool 54 comprises, at a longitudinal end opposite to that carrying the fingers, a recess 62 for mounting a lever forming tool capable of exerting a torque on the tool about the longitudinal axis.
  • the cavity is projecting 62 and has a hexagonal shape and the tool is of the ratchet type.
  • the recess is recessed and has a hexagonal, square section ..., the lever is then immobilized angularly on the tool 54 and the application of a torque on it causes the rotation of the tool.
  • the side wall of the central cavity 60 is perforated to reduce the mass of the tool 54. Indeed, this tool is held at arm's length during assembly and disassembly operations.
  • the retaining nut has protruding pins and that the tool has corresponding indentations.
  • the tool 54 ' is similar to the tool 54; however, it is adapted to the tightening / loosening of the retaining nut 38 when the punch is mounted on the compensator 20.
  • the central cavity 60 has a greater depth to accommodate the compensator and the punch.
  • the tool 54 is mounted around the punch and is oriented so that the fingers 58 are opposite the housing of the nut. The tool is then moved axially close to the nut and the fingers penetrate into the housing. A torque is exerted on the tool 54 in the loosening direction of the nut 38. The nut 38 turns on itself and unscrews itself. Almost simultaneously, the sleeve 32 is driven in rotation and axially by the nut 38, the displacement of the sleeve 32 has a slight delay due to axial and radial play.
  • the nut 38 and the sleeve 32 are removed. Then, the compensator 20 is extracted from the bore 18 by exerting a tensile force thereon.
  • the seals are checked and replaced if necessary.
  • the compensator 20 is introduced into the bore 18, preferably by means of a jacket (not shown).
  • the compensator is oriented so that the anti-rotation rod mounted in the bottom of the bore enters the bore of the compensator.
  • the sleeve assembly 32 and nut 38 is introduced into the bore 18 and mounted around the compensator.
  • the mounting of the sleeve 32 is made with particular care not to damage the seals.
  • the nut 38 is then screwed into the bore, which moves the sleeve 32 axially until it abuts against the annular bearing surface of the bore. Because of the radial clearance and the axial play, the sleeve 38 can be positioned on the compensator 20 and in the bore 18 without damaging the seals.
  • the present invention simplifies the maintenance of the presses, more particularly the maintenance of the compensators by providing a simplified disassembly of the guide sleeve and a mounting of the sleeve protecting the seals.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automatic Assembly (AREA)
  • Presses And Accessory Devices Thereof (AREA)
  • Press Drives And Press Lines (AREA)

Abstract

The invention relates to a guide and support assembly for a press compensator, comprising: a bushing (32) for guiding the compensator in the bore thereof, said bushing (32) to be mounted around the compensator; a support nut (38) to be screwed into the bore, the guide bushing (32) being located between a shoulder of the compensator and the support nut (38); and a means (44) axially securing the guide bushing (32) and the support nut (38) together while providing axial, transverse play between the guide bushing (32) and the support nut (38), wherein said means (44) is provided such that the guide bushing (32) is freely rotatable relative to the support nut (38).

Description

PRESSE A MAINTENANCE AMELIOREE  IMPROVED MAINTENANCE PRESS
DESCRIPTIONDESCRIPTION
DOMAINE TECHNIQUE ET ART ANTÉRIEUR La présente invention se rapporte à une presse offrant une maintenance améliorée, par exemple une presse destinée à la fabrication de pastilles de combustible nucléaire. TECHNICAL FIELD AND PRIOR ART The present invention relates to a press providing improved maintenance, for example a press intended for the manufacture of nuclear fuel pellets.
Une presse pour la fabrication de pastilles de combustible nucléaire comporte une table dans laquelle sont réalisées des matrices de moulage destinées au pressage de la poudre de combustible nucléaire entre deux poinçons, un poinçon inférieur et un poinçon supérieur. Le poinçon supérieur se déplace dans la matrice lors du pressage tandis que le poinçon inférieur reste immobile.  A press for the manufacture of nuclear fuel pellets comprises a table in which molding dies are made for pressing the nuclear fuel powder between two punches, a lower punch and an upper punch. The upper punch moves in the die during pressing while the lower punch remains stationary.
La poudre est par exemple formée d'un mélange d'oxyde de plutonium et d'oxyde d'uranium.  The powder is for example formed from a mixture of plutonium oxide and uranium oxide.
La table comporte une pluralité de matrices attaquées simultanément par une pluralité de poinçons. Chaque poinçon supérieur est porté par un compensateur, lui-même monté dans un support commun qui est déplacé par rapport à la table au moyen d'un vérin. Le support est appelé "carter de compensateur".  The table has a plurality of dies etched simultaneously by a plurality of punches. Each upper punch is carried by a compensator, itself mounted in a common support which is moved relative to the table by means of a jack. The support is called "compensator housing".
Un compensateur forme un piston, mobile de manière étanche dans un alésage réalisé dans le carter de compensateur. De l'huile sous pression est injectée entre le fond du piston et le fond de l'alésage de sorte à repousser le piston portant le poinçon vers l'extérieur du carter de compensateur. Les alésages sont reliés entre eux, et les compensateurs servent à équilibrer la pression d'huile sur les différents poinçons . A compensator forms a piston, sealingly movable in a bore formed in the compensator housing. Pressurized oil is injected between the bottom of the piston and the bottom of the bore so as to urge the piston bearing the punch outwardly of the compensator housing. The bores are interconnected, and the compensators are used to balance the oil pressure on the different punches.
Chaque compensateur comporte une partie de grand diamètre sur laquelle s'applique la pression d'huile, et une partie de petit diamètre dont une extrémité libre porte le poinçon.  Each compensator has a large diameter portion on which the oil pressure is applied, and a small diameter portion of which a free end carries the punch.
La partie de grand diamètre comporte sur sa périphérie des joints d ' étanchéité . Le compensateur est guidé dans l'alésage par une douille entourant la partie de petit diamètre. La douille est elle-même maintenue dans l'alésage par un écrou qui est vissé dans l'alésage du compensateur. La douille, également, comporte des joints d'étanchéité sur sa périphérie extérieure et sur sa périphérie intérieure.  The large diameter portion has on its periphery seals. The compensator is guided in the bore by a bushing surrounding the small diameter part. The sleeve is itself held in the bore by a nut which is screwed into the bore of the compensator. The bushing, also, has seals on its outer periphery and on its inner periphery.
Une étanchéité fiable du montage du compensateur est requise afin d'éviter toute pollution des matrices et de la poudre de combustible nucléaire. Il est rappelé que, pour des raisons de sécurité, la presse se trouve dans une boîte à gant ; de ce fait, toute intervention sur celle-ci est longue et fastidieuse. En outre, une pollution de la poudre provoque une mise au rebut des pastilles. Les étanchéités sont alors surveillées de manière régulière, ce qui impose un démontage des compensateurs. Pour cela, l' écrou de maintien est dévissé, puis la douille de guidage est retirée et enfin le compensateur est extrait de son alésage. Il peut arriver que la douille de guidage reste coincée dans l'alésage, il faut alors exercer un effort de traction sur la douille, ce qui peut endommager la douille et l'intérieur de l'alésage. Par ailleurs, cette zone est difficilement accessible, et dans tous les cas l'intervention se fait à travers un rond de gant. L'application de cet effort important est réalisée à bout de bras. En outre, lors du remontage de la douille, il peut apparaître un endommagement des j oints . Reliable sealing of the compensator assembly is required to prevent contamination of the dies and the nuclear fuel powder. It is recalled that, for security reasons, the press is in a glove box; therefore, any intervention on it is long and tedious. In addition, a pollution of the powder causes discarding of the pellets. The seals are then monitored regularly, which requires disassembly of the compensators. For this, the retaining nut is unscrewed, then the guide sleeve is removed and finally the compensator is extracted from its bore. It may happen that the guide sleeve remains stuck in the bore, it is then necessary to exert a tensile force on the sleeve, which can damage the bushing and the inside of the bore. In addition, this area is difficult to access, and in all cases the intervention is through a round of glove. The application of this important effort is carried out at arm's length. In addition, when reassembling the sleeve, it may appear damage to joints.
EXPOSÉ DE L ' INVENTION STATEMENT OF THE INVENTION
C'est par conséquent un but de la présente invention d'offrir un montage des compensateurs pour presse offrant une fiabilité améliorée et une maintenance simplifiée. It is therefore an object of the present invention to provide mounting of press compensators with improved reliability and simplified maintenance.
Le but précédemment énoncé est atteint par un ensemble douille de guidage et écrou de maintien rendus solidaires l'un de l'autre axialement, tout en assurant un jeu axial et un jeu radial ente la douille de guidage et l' écrou de maintien de sorte à permettre un auto-centrage de la douille dans l'alésage et autour du compensateur, lors du montage, pour éviter toute détérioration des joints. En outre, la douille est libre en rotation par rapport à 1 'écrou. Ainsi lors du serrage ou du desserrage de l' écrou, la douille ne tourne pas sur elle-même ce qui réduit les risques de détérioration des joints qu'elle porte.  The previously stated purpose is achieved by a guide sleeve and retaining nut assembly secured to one another axially, while providing axial play and radial clearance between the guide sleeve and the retaining nut so that to allow a self-centering of the sleeve in the bore and around the compensator, during the assembly, to avoid deterioration of the joints. In addition, the bushing is free to rotate relative to the nut. Thus when tightening or loosening the nut, the sleeve does not turn on itself which reduces the risk of damage to the seals it carries.
Lors du démontage, la douille de guidage est retirée avec l' écrou de maintien, son retrait est donc simplifié.  When disassembling, the guide bush is removed with the retaining nut, so its removal is simplified.
La présente invention a alors pour objet un ensemble de guidage et de maintien pour compensateur de presse comportant : - une douille de guidage du compensateur dans son alésage, ladite douille de guidage étant destinée à être montée autour du compensateur, The present invention therefore relates to a guiding and holding assembly for a press compensator comprising: a guide bushing of the compensator in its bore, said guide sleeve being intended to be mounted around the compensator,
- un écrou de maintien destiné à être vissé dans l'alésage, la douille de guidage se trouvant entre un épaulement du compensateur et l' écrou de maintien, et  - a retaining nut to be screwed into the bore, the guide sleeve being between a shoulder of the compensator and the retaining nut, and
- des moyens solidarisant axialement la douille de guidage et l' écrou de maintien tout en assurant un jeu axial et transversal entre la douille de guidage et l' écrou de maintien, lesdits moyens étant tels que la douille de guidage est libre en rotation par rapport à l' écrou de maintien.  means axially securing the guide sleeve and the retaining nut while ensuring axial and transverse play between the guide bushing and the retaining nut, said means being such that the guiding bushing is free to rotate relative to to the retaining nut.
De manière avantageuse, la douille de guidage est entourée par l' écrou de maintien sur une partie de sa longueur, et les moyens de solidarisâtion comportent au moins deux doigts radiaux logés dans des perçages radiaux (réalisés dans l' écrou de maintien et dont une extrémité radialement intérieure débouche dans une gorge annulaire réalisée dans la périphérie extérieure de la douille de guidage, un jeu radial étant prévu entre l'extrémité radialement intérieure des doigts radiaux et un fond radial de la gorge et un jeu axial étant prévu entre des bords latéraux des l'extrémité radialement intérieure des doigts radiaux et des bords latéraux de la gorge.  Advantageously, the guide sleeve is surrounded by the retaining nut over part of its length, and the securing means comprise at least two radial fingers housed in radial bores (made in the retaining nut and one of which radially inner end opens into an annular groove formed in the outer periphery of the guide sleeve, a radial clearance being provided between the radially inner end of the radial fingers and a radial bottom of the groove and an axial play being provided between side edges the radially inner end of the radial fingers and the lateral edges of the groove.
De préférence, les doigts radiaux sont maintenus en position dans les logements radiaux au moyen de vis de pression. Les vis de pression peuvent être immobilisées axialement par exemple au moyen d'un coup de pointeau ou par un frein filet. L'extrémité radialement intérieure des doigts présente avantageusement un diamètre réduit. Les doigts radiaux sont de préférence au nombre de trois disposés à 120° les uns des autres. Preferably, the radial fingers are held in position in the radial housings by means of pressure screws. The pressure screws can be immobilized axially for example by means of a needle punch or a threadlock. The end radially inner fingers advantageously has a reduced diameter. The radial fingers are preferably three in number arranged at 120 ° from each other.
La douille de guidage peut comporter dans sa périphérie intérieure un segment de guidage du compensateur .  The guide sleeve may comprise in its inner periphery a guide segment of the compensator.
Dans un exemple de réalisation, l'écrou de maintien comporte dans une face transversale opposée à celle en contact avec la douille de guidage des empreintes destinés à coopérer avec des empreintes portées par un outil pour exercer un effort de serrage ou de desserrage sur l'écrou de maintien.  In an exemplary embodiment, the retaining nut comprises, in a transverse face opposite to that in contact with the guiding bush, indentations intended to cooperate with indentations carried by a tool for exerting a tightening or loosening force on the holding nut.
La présente invention a également pour objet une presse comportant :  The present invention also relates to a press comprising:
- une table munie d'au moins deux matrices de moulage,  a table provided with at least two molding dies,
- des poinçons d'axe longitudinal destinés à pénétrer dans les matrices,  - punches with longitudinal axis intended to penetrate the dies,
- un support de poinçons apte à être déplacé par un vérin pour rapprocher les poinçons des matrices de moulage dans une direction longitudinale,  a punch holder adapted to be moved by a jack to bring the punches of the molding dies in a longitudinal direction,
- des compensateurs associés à chacun des poinçons, chaque compensateur présentant un axe longitudinal et étant monté de manière étanche dans un alésage du support, et comportant une première extrémité longitudinale destinée à subir une pression de fluide hydraulique et une deuxième extrémité longitudinale portant le poinçon, lesdits alésages étant en communication fluidique les uns avec les autres, et - des ensembles de guidage et de maintien de compensateur selon la présente invention montés dans chacun des alésages. compensators associated with each of the punches, each compensator having a longitudinal axis and being sealingly mounted in a bore of the support, and having a first longitudinal end intended to undergo a pressure of hydraulic fluid and a second longitudinal end bearing the punch, said bores being in fluid communication with each other, and - Compensating guide and maintenance assemblies according to the present invention mounted in each of the bores.
La presse forme par exemple une presse de fabrication de pastilles de combustible nucléaire.  The press forms, for example, a press for manufacturing nuclear fuel pellets.
Un outil de montage et de démontage de l'ensemble de guidage et de maintien de compensateur de presse selon la présente invention, pour le serrage et le desserrage des écrous de maintien des compensateurs, peut présenter un axe longitudinal et comporte une cavité centrale ouverte à une première extrémité pour recevoir la deuxième extrémité du compensateur, ladite extrémité ouverte étant bordée par une surface annulaire munie d'empreintes en creux ou en saillie correspondant à des empreintes en saillie ou en creux respectivement aux logements de l'écrou, et à une deuxième extrémité des moyens pour exercer un effort de rotation sur l'outil autour de son axe longitudinal.  A tool for mounting and dismounting the press compensator guiding and holding assembly according to the present invention, for clamping and loosening the compensator retaining nuts, may have a longitudinal axis and has a central cavity open to a first end for receiving the second end of the compensator, said open end being bordered by an annular surface provided with indentations or protrusions corresponding to recesses protruding or recessed respectively to the housing of the nut, and a second end means for exerting a rotational force on the tool about its longitudinal axis.
L'outil peut comporter des empreintes en saillie et l'écrou peut comporter des empreintes en creux .  The tool may have protruding indentations and the nut may have indentations.
Les moyens pour exercer un effort de rotation à l'outil sont formés par exemple par une empreinte pour le montage et l'immobilisation angulaire d'un levier sur l'outil, par exemple une empreinte de forme polygonale en creux ou en saillie.  The means for exerting a rotational force to the tool are formed for example by a fingerprint for the mounting and the angular immobilization of a lever on the tool, for example an imprint of polygonal shape recessed or protruding.
De préférence, la paroi latérale du logement central est ajourée.  Preferably, the side wall of the central housing is perforated.
Il peut être prévu que la profondeur du logement corresponde sensiblement soit à la longueur de la partie du compensateur faisant saillie de l'écrou, soit à la longueur de l'ensemble formé par la partie du compensateur faisant saillie de l'écrou et le poinçon. It can be provided that the depth of the housing corresponds substantially to the length of the portion of the compensator projecting from the nut, or the length of the assembly formed by the portion of the compensator projecting from the nut and the punch.
BRÈVE DESCRIPTION DES DESSINS BRIEF DESCRIPTION OF THE DRAWINGS
La présente invention sera mieux comprise à l'aide de la description qui va suivre et des dessins en annexes sur lesquels : The present invention will be better understood with the aid of the description which follows and the drawings in appendices in which:
- la figure 1 est une représentation schématique d'une presse de fabrication de pastilles de combustible nucléaire à laquelle peut s'appliquer la présente invention,  FIG. 1 is a diagrammatic representation of a nuclear fuel pellet manufacturing press to which the present invention can be applied,
- la figure 2 est une vue en coupe partielle d'un carter de compensateur muni des poinçons supérieurs, adapté à la presse de la figure 1,  FIG. 2 is a partial sectional view of a compensator casing provided with upper punches, adapted to the press of FIG. 1;
- la figure 3 est une vue agrandie d'un détail de la figure 2, - la figure 4A est une vue en coupe longitudinale d'un ensemble douille de montage et écrou de guidage représenté seul, selon un plan de coupe différent de celui de la figure 3,  FIG. 3 is an enlarged view of a detail of FIG. 2; FIG. 4A is a longitudinal sectional view of a mounting bushing and guide nut assembly represented alone, in a plane of section different from that of FIG. FIG. 3
- la figure 4B est une vue de détail de la figure 4A,  FIG. 4B is a detail view of FIG. 4A,
- la figure 4C est une vue en coupe transversale le long du plan A-A de la figure 4A,  FIG. 4C is a cross-sectional view along the plane A-A of FIG. 4A,
- les figures 5A et 5B sont des vues en coupe longitudinale d'exemples de réalisation d'outils pour le démontage de l'ensemble douille de guidage et écrou de maintien. EXPOSÉ DÉTAILLÉ DE MODES DE RÉALISATION PARTICULIERS - Figures 5A and 5B are longitudinal sectional views of embodiments of tools for disassembly of the guide sleeve assembly and retaining nut. DETAILED PRESENTATION OF PARTICULAR EMBODIMENTS
Sur la figure 1, on peut voir une presse pour la fabrication de pastilles de combustible nucléaire, représentée de manière très schématique. In Figure 1, we can see a press for the manufacture of nuclear fuel pellets, shown very schematically.
La présente invention s'applique à tout type de presse hydraulique et ne se limite pas au domaine nucléaire. Elle est particulièrement avantageuse dans les domaines où la propreté est un critère important, mais également dans tous les domaines mettant en œuvre des presses, du fait de sa maintenance simplifiée.  The present invention applies to any type of hydraulic press and is not limited to the nuclear field. It is particularly advantageous in the areas where cleanliness is an important criterion, but also in all areas implementing presses, because of its simplified maintenance.
La presse de la figure 1 est logée dans une enceinte confinée 2, type boîte à gant. Elle comporte une table 4 portant les matrices de moulage 6, montée mobile le long de colonnes de guidage 8, un vérin inférieur Vi pour déplacer la table 4, un support fixe 12 de poinçons inférieurs 14 et un support mobile 15 de poinçons supérieurs 16 et déplaçable par un vérin supérieur Vs . Le support 15 forme le carter de compensateur et porte les compensateurs (non représentés) et les poinçons supérieurs 16. Dans l'exemple représenté, les vérins traversent de manière étanche les parois de l'enceinte 2.  The press of FIG. 1 is housed in a confined enclosure 2, type glove box. It comprises a table 4 carrying the molding dies 6, mounted mobile along guide columns 8, a lower jack Vi to move the table 4, a fixed support 12 of lower punches 14 and a movable support 15 of upper punches 16 and displaceable by an upper cylinder Vs. The support 15 forms the compensator casing and carries the compensators (not shown) and the upper punches 16. In the example shown, the cylinders pass tightly through the walls of the enclosure 2.
Sur la figure 2, on peut voir une vue de détail du carter de compensateur 15 et sur la figure 3, on peut voir un compensateur seul monté dans son alésage .  In FIG. 2, a detail view of the compensator housing 15 can be seen and in FIG. 3, a compensator alone can be seen mounted in its bore.
Le carter de compensateur 15 est formé par une plaque dans laquelle sont usinés des alésages 18, d'axe longitudinal X, chacun d'entre eux recevant un compensateur 20. Dans l'exemple représenté, les alésages 18 sont traversants et sont obturés à une extrémité, opposée à celle par laquelle sort le compensateur, par un bouchon 22. The compensator housing 15 is formed by a plate in which are machined bores 18, of longitudinal axis X, each of them receiving a compensator 20. In the example shown, the bores 18 are through and are closed at one end, opposite to that by which the compensator leaves, by a plug 22.
Chaque alésage 18 comporte une première portion de plus petit diamètre 18.1 et une deuxième portion de plus grand diamètre 18.2 se raccordant à la portion de plus petit diamètre 18.1 par une portée annulaire 18.3. Le compensateur 20 comporte une première partie de plus grand diamètre 20.1 et une deuxième partie de plus petit diamètre 20.2 se raccordant à la partie de plus grand diamètre par un épaulement 20.3. La partie de plus grand diamètre 20.1 est reçu dans la portion de plus petit diamètre 18.1 de 1 ' alésage 18.  Each bore 18 has a first portion of smaller diameter 18.1 and a second portion of larger diameter 18.2 connecting to the portion of smaller diameter 18.1 by an annular bearing surface 18.3. The compensator 20 has a first portion of larger diameter 20.1 and a second portion of smaller diameter 20.2 connecting to the larger diameter portion by a shoulder 20.3. The larger diameter portion 20.1 is received in the smaller diameter portion 18.1 of the bore 18.
Par exemple, la partie de plus grand diamètre 20.1 du compensateur 20 comporte une gorge 24 recevant un joint d'étanchéité 26 et deux gorges 28 situées de part et d'autre de la gorge 24 et recevant des bagues de guidage 30. Avantageusement le fond de la partie de plus grand diamètre 20.1 du compensateur 20 comporte deux alésages 29 recevant deux piges antirotation 31 fixée dans le fond de l'alésage 18.  For example, the larger diameter portion 20.1 of the compensator 20 has a groove 24 receiving a seal 26 and two grooves 28 located on either side of the groove 24 and receiving guide rings 30. Advantageously the bottom of the larger diameter portion 20.1 of the compensator 20 comprises two bores 29 receiving two anti-rotation rods 31 fixed in the bottom of the bore 18.
Le fond de chaque alésage délimite avec le fond du compensateur qu'il contient une chambre 19 destinée à être remplie d'huile sous pression. Les chambres 19 de tous les alésages sont en communication fluidique les unes avec les autres pour permettre la circulation de l'huile entre les chambres 19 et assurer l'équilibrage des pressions sur les poinçons lors de l'étape de pressage. Des piquages 19 (figure 2) réalisés en face avant du carter de compensateur permettent le remplissage des alésages. The bottom of each bore defines with the bottom of the compensator that it contains a chamber 19 to be filled with oil under pressure. The chambers 19 of all the bores are in fluid communication with each other to allow the flow of oil between the chambers 19 and ensure the balancing of the pressures on the punches during the pressing step. Pits 19 (Figure 2) made in front of the compensator housing allow the filling of the bores.
Une douille de guidage 32 est montée dans la portion de plus grand diamètre 18.2 de l'alésage 18 et est en butée contre la portée annulaire 18.3. La douille 32 entoure la partie de plus petit diamètre 20.2 du compensateur 20. La douille comporte une partie de grand diamètre extérieur 32.1 et une partie de petit diamètre extérieur 32.2 se raccordant par un épaulement 32.3.  A guide sleeve 32 is mounted in the larger diameter portion 18.2 of the bore 18 and abuts against the annular bearing surface 18.3. The bushing 32 surrounds the smaller diameter portion 20.2 of the compensator 20. The bushing has a large outer diameter portion 32.1 and a small outer diameter portion 32.2 connected by a shoulder 32.3.
Dans l'exemple représenté, la douille de guidage 32 comporte sur sa périphérie extérieure deux joints d'étanchéité 34 et sur sa périphérie intérieure deux moyens d'étanchéité 35 décalés axialement et un segment de guidage 36 du compensateur. Le segment de guidage est monté dans la partie de petit diamètre extérieur 32.2. De manière avantageuse, les moyens d'étanchéité 35 comportent chacun un joint torique monté radialement en fond de gorge et une bague d'étanchéité en sortie de gorge et frottant sur le compensateur. La bague est alors plaquée sur le compensateur par le joint torique et par l'huile sous pression .  In the example shown, the guide sleeve 32 has on its outer periphery two seals 34 and on its inner periphery two axially offset sealing means 35 and a guide segment 36 of the compensator. The guide segment is mounted in the small outer diameter portion 32.2. Advantageously, the sealing means 35 each comprise an O-ring mounted radially at the bottom of the groove and a sealing ring at the outlet of the groove and rubbing on the compensator. The ring is then pressed onto the compensator by the O-ring and the pressurized oil.
Un écrou de maintien 38 est monté dans la portion de plus grand diamètre 18.2 de l'alésage 18 et est en appui contre l' épaulement 32.3 de la douille de guidage 32.  A retaining nut 38 is mounted in the larger diameter portion 18.2 of the bore 18 and bears against the shoulder 32.3 of the guide sleeve 32.
L' écrou de maintien 38 comporte une partie de grand diamètre intérieur 38.1 et une partie de petit diamètre intérieur 38.2. L' écrou de maintien 38 est monté autour de la douille 32 de sorte que sa partie de grand diamètre intérieur 38.1 entoure la partie de petit diamètre extérieur 32.2 de la douille de guidage 32. The retaining nut 38 has a large inner diameter portion 38.1 and a small inner diameter portion 38.2. The retaining nut 38 is mounted around the sleeve 32 so that its large-diameter inner portion 38.1 surrounds the small outer diameter portion 32.2 of the guide sleeve 32.
L'écrou de maintien 38 comporte un filetage 40 sur sa périphérie extérieure coopérant avec un taraudage de la portion de plus grand diamètre 18.2. L'écrou de maintien porte sur sa périphérie intérieure un joint d'étanchéité 42, par exemple du type joint à lèvre frottant sur la partie de plus petit diamètre 20.2 du compensateur.  The retaining nut 38 has a thread 40 on its outer periphery cooperating with a tapping of the portion of larger diameter 18.2. The retaining nut carries on its inner periphery a seal 42, for example of the lip seal type rubbing on the smaller diameter portion 20.2 of the compensator.
Un jeu est prévu entre le diamètre intérieur de la partie de grand diamètre 38.1 de l'écrou et le diamètre extérieur de la partie de petit diamètre de la douille 32, de sorte que la douille ne soit pas montée à force dans l'écrou.  A clearance is provided between the inner diameter of the large diameter portion 38.1 of the nut and the outer diameter of the small diameter portion of the bushing 32, so that the bushing is not forced into the nut.
Sur la figure 4A, on peut voir une vue en coupe de l'ensemble douille de guidage 32 et écrou de maintien 38, représenté seul suivant un plan de coupe différent de celui de la figure 3.  In FIG. 4A, a sectional view of the guide sleeve assembly 32 and the retaining nut 38, represented alone along a plane of section different from that of FIG. 3, can be seen.
Selon la présente invention, la douille 32 et l'écrou sont solidarisés axialement et radialement l'un à l'autre, tout en laissant un jeu axial et radial entre les pièces. Des moyens de solidarisâtion 44 avec jeu sont alors prévus entre la douille 32 et l'écrou 38.  According to the present invention, the bushing 32 and the nut are secured axially and radially to one another, while leaving an axial and radial clearance between the parts. Solidarity means 44 with clearance are then provided between the sleeve 32 and the nut 38.
Dans l'exemple représenté sur les figures 4B et 4C et de manière avantageuse, les moyens de solidarisâtion 44 comportent trois perçages radiaux 46 disposés à 120° les uns des autres formés dans l'écrou, pratiqués dans la partie de petit diamètre intérieur et débouchant dans une gorge 48 réalisée dans la périphérie de partie de petit diamètre extérieur 32.2 de la douille 32 et de doigts 50, logés dans les logements 46 et pénétrant dans la gorge 48. Les dimensions extérieures des doigts et les dimensions de la gorge 48 sont choisies de sorte qu'un jeu radial et un jeu axial soient assurés. Les doigts 50 sont montés glissants dans les logements 46. In the example shown in Figures 4B and 4C and advantageously, the solidarity means 44 comprise three radial holes 46 arranged at 120 ° from each other formed in the nut, made in the small inner diameter portion and opening in a groove 48 made in the periphery of small outer diameter portion 32.2 of the sleeve 32 and fingers 50, housed in the housing 46 and penetrating the groove 48. The outer dimensions of the fingers and the dimensions of the groove 48 are chosen so that a radial clearance and axial play are assured. The fingers 50 are slidably mounted in the housings 46.
Les moyens de solidarisâtion pourraient comporter deux doigts, cependant la mise en œuvre de trois doigts réduit les risques d'une mise en biais de l'écrou par rapport à la douille.  The solidarity means may comprise two fingers, however the implementation of three fingers reduces the risk of biasing the nut relative to the sleeve.
La gorge 48 évite la nécessité d'orienter angulairement l'écrou par rapport à la douille. En outre, la douille n'est pas solidaire en rotation de l'écrou. Ainsi, lors du serrage et du desserrage de l'écrou, la douille 32 ne tourne pas avec l'écrou, ce qui évite de solliciter les joints d ' étanchéité .  The groove 48 avoids the need to angularly orient the nut relative to the sleeve. In addition, the sleeve is not integral in rotation with the nut. Thus, during the tightening and loosening of the nut, the sleeve 32 does not rotate with the nut, which avoids soliciting the seals.
Dans l'exemple représenté et de manière avantageuse, la position transversale des doigts et donc le jeu radial sont réglés par des vis de pression In the example shown and advantageously, the transverse position of the fingers and thus the radial clearance are adjusted by pressure screws.
52 vissées dans les perçages radiaux 46 après introduction de doigts. 52 screwed into the radial holes 46 after introduction of fingers.
La mise ne œuvre des vis de pression permet de disposer d'une pièce supplémentaire sur laquelle il sera possible d'ajouter des tolérances donc du jeu. The implementation of the pressure screws makes it possible to have an additional part on which it will be possible to add tolerances thus of the game.
Cette pièce offre la possibilité d'améliorer le jeu axial . This piece offers the possibility of improving axial play.
Avantageusement la rotation des vis de pression 52 est bloquée afin d'assurer une position fixe des doigts au cours du temps, par exemple par du frein-filet ou au moyen d'un coup de pointeau au niveau du taraudage. Cette fixation définitive permet de fixer de manière permanente et de manière très simple les jeux. Ceci est rendu possible car, durant la vie de la presse, la douille et l'écrou n'ont pas besoin d'être séparés. Advantageously, the rotation of the pressure screws 52 is blocked in order to ensure a fixed position of the fingers over time, for example by means of the threadlocker or by means of a needle punch at the level tapping. This definitive fixation makes it possible to fix the games permanently and in a very simple manner. This is made possible because during the life of the press, the bushing and the nut do not need to be separated.
Avantageusement, l'extrémité des doigts 50 pénétrant dans la gorge annulaire 48 présente une extrémité ayant section de diamètre réduit, ce qui permet de limiter la taille de la gorge annulaire 48 et évite d'induire des points faibles dans la douille 32. Cette extrémité à section de diamètre réduit assure un guidage non contraignant pour les joints de la douille 32 lors de la mise en place de l'ensemble douille 32 et écrou 38 dans l'alésage du carter compensateurs. En position bloquée l'effort de serrage est repris par les surfaces en contact des pièces 32 et 38 au niveau de la portée 57 sur la figure 4A.  Advantageously, the end of the fingers 50 penetrating into the annular groove 48 has an end having a reduced diameter section, which makes it possible to limit the size of the annular groove 48 and avoids inducing weak spots in the bushing 32. This end With reduced diameter section provides non-binding guidance for the seals of the sleeve 32 during the introduction of the sleeve assembly 32 and nut 38 in the bore of the compensator housing. In the locked position, the clamping force is taken up by the surfaces in contact with the parts 32 and 38 at the bearing surface 57 in FIG. 4A.
Par exemple, un jeu axial entre la douille 38 et l'écrou 37 est compris entre 0,045 mm et 0,355 mm est prévu. Lors de la mise en place des vis de pression 52 le serrage est ajusté pour garder un jeu radial compris entre 0,05 mm et 0,139 mm.  For example, an axial clearance between the sleeve 38 and the nut 37 is between 0.045 mm and 0.355 mm is provided. When setting the pressure screws 52 the clamping is adjusted to keep a radial clearance between 0.05 mm and 0.139 mm.
Ainsi, lors du desserrage de l'écrou 38, la douille 32 est retirée.  Thus, when loosening the nut 38, the sleeve 32 is removed.
Ces moyens de solidarisâtion présentent également l'avantage de ne pas perturber l'étanchéité de compensateur.  These solidarity means also have the advantage of not disturbing the compensator seal.
Sur les figures 5A et 5B, on peut voir des outils spécialement adaptés au serrage/desserrage de l'écrou de maintien 38. Sur la figure 5A, l'outil 54 est adapté au serrage/desserrage de l'écrou de maintien 38 lorsque le poinçon n'est pas monté sur le compensateur 20. L'outil 54 comporte des moyens pour entraîner en rotation l'écrou dans un sens de serrage ou de desserrage. In FIGS. 5A and 5B, tools specially adapted for tightening / loosening of the retaining nut 38 can be seen. In FIG. 5A, the tool 54 is adapted to tighten / loosen the retaining nut 38 when the punch is not mounted on the compensator 20. The tool 54 comprises means for rotating the nut in a direction of tightening or loosening.
Dans l'exemple représenté, l'outil 54 comporte, à une première extrémité longitudinale, une face annulaire 56 munie de trois doigts 58 en saillie et s 'étendant longitudinalement . Les doigts 58 sont destinés à pénétrer dans trois logements 59 correspondants pratiqués dans une face de l'écrou de maintien 38 orientée vers l'extérieur de l'alésage 18. Les doigts 58 sont par exemple formés par des goupilles montées dans des alésages réalisés dans la face transversale 56. L'outil comporte au moins deux doigts et de préférence au moins trois.  In the example shown, the tool 54 comprises, at a first longitudinal end, an annular face 56 provided with three fingers 58 projecting and extending longitudinally. The fingers 58 are intended to penetrate into three corresponding housings 59 formed in one face of the retaining nut 38 oriented towards the outside of the bore 18. The fingers 58 are for example formed by pins mounted in bores made in the transverse face 56. The tool comprises at least two fingers and preferably at least three.
L'outil 54 comporte également une cavité centrale 60 bordée par la face annulaire 56; la cavité 60 est destinée à recevoir l'extrémité en saillie du compensateur 20.  The tool 54 also comprises a central cavity 60 bordered by the annular face 56; the cavity 60 is intended to receive the projecting end of the compensator 20.
L'outil 54 comporte, à une extrémité longitudinale opposée à celle portant les doigts, une empreinte 62 destinée au montage d'un outil formant levier apte à exercer un couple sur l'outil autour de l'axe longitudinal. Dans l'exemple représenté, l'empreinte est en saillie 62 et présente une forme hexagonale et l'outil est du type clé à cliquet. En variante, l'empreinte est en creux et présente une section hexagonale, carrée..., le levier est alors immobilisé angulairement sur l'outil 54 et l'application d'un couple sur celui-ci provoque la rotation de l'outil. The tool 54 comprises, at a longitudinal end opposite to that carrying the fingers, a recess 62 for mounting a lever forming tool capable of exerting a torque on the tool about the longitudinal axis. In the example shown, the cavity is projecting 62 and has a hexagonal shape and the tool is of the ratchet type. In a variant, the recess is recessed and has a hexagonal, square section ..., the lever is then immobilized angularly on the tool 54 and the application of a torque on it causes the rotation of the tool.
De manière avantageuse, la paroi latérale de la cavité centrale 60 est ajourée afin de réduire la masse de l'outil 54. En effet, cet outil est tenu à bout de bras lors des opérations de montage et démontage .  Advantageously, the side wall of the central cavity 60 is perforated to reduce the mass of the tool 54. Indeed, this tool is held at arm's length during assembly and disassembly operations.
En variante, on peut imaginer que l'écrou de maintien comporte des pions en saillie et que l'outil comporte des empreintes en creux correspondantes .  Alternatively, it is conceivable that the retaining nut has protruding pins and that the tool has corresponding indentations.
Sur la figure 5B, l'outil 54' est similaire à l'outil 54 ; cependant, il est adapté au serrage/desserrage de l'écrou de maintien 38 lorsque le poinçon est monté sur le compensateur 20. A cet effet, la cavité centrale 60 présente une profondeur plus grande pour loger le compensateur et le poinçon.  In Fig. 5B, the tool 54 'is similar to the tool 54; however, it is adapted to the tightening / loosening of the retaining nut 38 when the punch is mounted on the compensator 20. For this purpose, the central cavity 60 has a greater depth to accommodate the compensator and the punch.
Nous allons maintenant décrire le démontage et montage d'un compensateur au moyen de l'ensemble douille et écrou.  We will now describe the disassembly and assembly of a compensator by means of the sleeve and nut assembly.
Lors d'une opération de maintenance de la presse, les étanchéités des compensateurs sont vérifiées. On considère le cas où les poinçons supérieurs ont été retirés des compensateurs.  During a maintenance operation of the press, the sealing of the compensators are checked. Consider the case where the upper punches have been removed from the compensators.
L'outil 54 est monté autour du poinçon et est orienté de sorte que les doigts 58 soient en face des logements de l'écrou. L'outil est ensuite rapproché axialement de l'écrou et les doigts pénètrent dans les logements. Un couple est exercé sur l'outil 54 dans le sens du desserrage de l'écrou 38. L'écrou 38 tourne sur lui-même et se dévisse. De manière quasi-simultanée, la douille 32 est entraînée en rotation et axialement par l'écrou 38, le déplacement de la douille 32 a un léger retard du fait des jeux axial et radial. The tool 54 is mounted around the punch and is oriented so that the fingers 58 are opposite the housing of the nut. The tool is then moved axially close to the nut and the fingers penetrate into the housing. A torque is exerted on the tool 54 in the loosening direction of the nut 38. The nut 38 turns on itself and unscrews itself. Almost simultaneously, the sleeve 32 is driven in rotation and axially by the nut 38, the displacement of the sleeve 32 has a slight delay due to axial and radial play.
L'écrou 38 et la douille 32 sont retirés. Ensuite, le compensateur 20 est extrait de l'alésage 18 en exerçant un effort de traction sur celui-ci.  The nut 38 and the sleeve 32 are removed. Then, the compensator 20 is extracted from the bore 18 by exerting a tensile force thereon.
Les joints sont vérifiés et remplacés si cela est nécessaire.  The seals are checked and replaced if necessary.
Lors du remontage, le compensateur 20 est introduit dans l'alésage 18, avantageusement au moyen d'une chemise (non représentée) . Le compensateur est orienté de sorte que la pige anti-rotation montée dans le fond de l'alésage pénètre dans l'alésage du compensateur .  During reassembly, the compensator 20 is introduced into the bore 18, preferably by means of a jacket (not shown). The compensator is oriented so that the anti-rotation rod mounted in the bottom of the bore enters the bore of the compensator.
Ensuite, l'ensemble douille 32 et écrou 38 est introduit dans l'alésage 18 et monté autour du compensateur. Le montage de la douille 32 est fait avec un soin particulier pour ne pas endommager les joints. L'écrou 38 est ensuite vissé dans l'alésage, ce qui déplace la douille 32 axialement jusqu'à ce qu'elle vienne en butée contre la portée annulaire de l'alésage. Du fait du jeu radial et du jeu axial, la douille 38 peut se positionner sur le compensateur 20 et dans l'alésage 18 sans endommager les joints.  Then, the sleeve assembly 32 and nut 38 is introduced into the bore 18 and mounted around the compensator. The mounting of the sleeve 32 is made with particular care not to damage the seals. The nut 38 is then screwed into the bore, which moves the sleeve 32 axially until it abuts against the annular bearing surface of the bore. Because of the radial clearance and the axial play, the sleeve 38 can be positioned on the compensator 20 and in the bore 18 without damaging the seals.
La présente invention simplifie la maintenance des presses, plus particulièrement la maintenance des compensateurs en assurant un démontage simplifié de la douille de guidage et un montage de la douille protégeant les étanchéités.  The present invention simplifies the maintenance of the presses, more particularly the maintenance of the compensators by providing a simplified disassembly of the guide sleeve and a mounting of the sleeve protecting the seals.

Claims

REVENDICATIONS
1. Ensemble de guidage et de maintien pour compensateur de presse comportant : A guiding and holding assembly for a press compensator comprising:
- une douille de guidage (32) du compensateur (20) dans son alésage, ladite douille de guidage étant destinée à être montée autour du compensateur (20),  a guide bushing (32) of the compensator (20) in its bore, said guide sleeve being intended to be mounted around the compensator (20),
- un écrou de maintien (38) destiné à être vissé dans l'alésage (18), la douille de guidage (32) se trouvant entre un épaulement (20.3) du compensateur (20) et l'écrou de maintien (38), et  - a retaining nut (38) to be screwed into the bore (18), the guide sleeve (32) being between a shoulder (20.3) of the compensator (20) and the retaining nut (38), and
- des moyens (44) solidarisant axialement la douille de guidage (32) et l'écrou de maintien (38) tout en assurant un jeu axial et transversal entre la douille de guidage (32) et l'écrou de maintien (38), lesdits moyens (44) étant tels que la douille de guidage (32) est libre en rotation par rapport à l'écrou de maintien (38) .  means (44) axially securing the guide sleeve (32) and the retaining nut (38) while ensuring axial and transverse play between the guide sleeve (32) and the retaining nut (38), said means (44) being such that the guide sleeve (32) is free to rotate relative to the retaining nut (38).
2. Ensemble selon la revendication 1, dans lequel la douille de guidage (32) est entourée par l'écrou de maintien (38) sur une partie de sa longueur, et les moyens de solidarisâtion (44) comportent au moins deux doigts radiaux (50) logés dans des perçages radiaux (46) réalisés dans l'écrou de maintien (38) et dont une extrémité radialement intérieure débouche dans une gorge annulaire (48) réalisée dans la périphérie extérieure de la douille de guidage (32), un jeu radial étant prévu entre l'extrémité radialement intérieure des doigts radiaux (50) et un fond radial de la gorge (48) et un jeu axial étant prévu entre des bords latéraux des l'extrémité radialement intérieure des doigts radiaux (50) et des bords latéraux de la gorge (48) . 2. An assembly according to claim 1, wherein the guide sleeve (32) is surrounded by the retaining nut (38) over part of its length, and the securing means (44) comprise at least two radial fingers ( 50) housed in radial bores (46) formed in the retaining nut (38) and a radially inner end of which opens into an annular groove (48) formed in the outer periphery of the guide sleeve (32), a set radial being provided between the radially inner end of the radial fingers (50) and a radial bottom of the throat (48) and axial clearance being provided between lateral edges of the radially inner end of the radial fingers (50) and lateral edges of the groove (48).
3. Ensemble selon la revendication 2, dans lequel les doigts radiaux (50) sont maintenus en position dans les logements radiaux au moyen de vis de pression ( 52 ) . 3. The assembly of claim 2, wherein the radial fingers (50) are held in position in the radial housing by means of pressure screws (52).
4. Ensemble selon la revendication 3, dans lequel les vis sont immobilisées axialement par exemple au moyen d'un coup de pointeau ou par un frein filet . 4. The assembly of claim 3, wherein the screws are immobilized axially for example by means of a needle punch or a threadlocker.
5. ensemble selon l'une des revendications 2, 3 ou 4, dans lequel l'extrémité radialement intérieure des doigts présente un diamètre réduit. 5. The assembly according to one of claims 2, 3 or 4, wherein the radially inner end of the fingers has a reduced diameter.
6. Ensemble selon l'une des revendications6. Assembly according to one of the claims
2 à 5, dans lequel les doigts radiaux (50) sont au nombre de trois disposés à 120° les uns des autres. 2 to 5, in which the radial fingers (50) are three in number arranged at 120 ° from each other.
7. Ensemble selon l'une des revendications 1 à 6, dans lequel la douille de guidage (32) comporte dans sa périphérie intérieure un segment de guidage du compensateur . 7. An assembly according to one of claims 1 to 6, wherein the guide sleeve (32) has in its inner periphery a guide segment of the compensator.
8. Ensemble selon l'une des revendications 1 à 7, dans lequel l'écrou de maintien (38) comporte dans une face transversale opposée à celle en contact avec la douille de guidage (32) des empreintes (59) destinés à coopérer avec des empreintes (58) portées par un outil (54, 54') pour exercer un effort de serrage ou de desserrage sur l'écrou de maintien (38) . 8. Assembly according to one of claims 1 to 7, wherein the retaining nut (38) comprises in a transverse face opposite to that in contact. with the guide sleeve (32) of the cavities (59) intended to cooperate with indentations (58) carried by a tool (54, 54 ') for exerting a tightening or loosening force on the retaining nut (38) .
9. Presse comportant : 9. Press comprising:
- une table (4) munie d'au moins deux matrices de moulage (6),  a table (4) provided with at least two molding dies (6),
- des poinçons (16) d'axe longitudinal destinés à pénétrer dans les matrices,  - punches (16) of longitudinal axis intended to penetrate the dies,
- un support (15) de poinçons (16) apte à être déplacé par un vérin (Vs) pour rapprocher les poinçons (16) des matrices de moulage (6) dans une direction longitudinale,  - a support (15) punches (16) adapted to be moved by a jack (Vs) to bring the punches (16) of the molding dies (6) in a longitudinal direction,
- des compensateurs (20) associés à chacun des poinçons (16), chaque compensateur (20) présentant un axe longitudinal et étant monté de manière étanche dans un alésage (18) du support (20), et comportant une première extrémité longitudinale destinée à subir une pression de fluide hydraulique et une deuxième extrémité longitudinale portant le poinçon (16), lesdits alésages (18) étant en communication fluidique les uns avec les autres, et  compensators associated with each of the punches, each compensator having a longitudinal axis and being sealingly mounted in a bore of the support undergoing hydraulic fluid pressure and a second longitudinal end bearing the punch (16), said bores (18) being in fluid communication with each other, and
- des ensembles de guidage et de maintien de compensateur selon l'une des revendications 1 à 8 montés dans chacun des alésages (18) .  - Compensator guide and retaining assemblies according to one of claims 1 to 8 mounted in each of the bores (18).
10. Presse selon la revendication 9, formant une presse de fabrication de pastilles de combustible nucléaire. 10. Press according to claim 9, forming a nuclear fuel pellets manufacturing press.
EP12711140.9A 2011-03-23 2012-03-21 Press having improved support Active EP2688741B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1152412A FR2972957B1 (en) 2011-03-23 2011-03-23 IMPROVED MAINTENANCE PRESS
PCT/EP2012/054954 WO2012126930A1 (en) 2011-03-23 2012-03-21 Press having improved support

Publications (2)

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EP2688741A1 true EP2688741A1 (en) 2014-01-29
EP2688741B1 EP2688741B1 (en) 2019-04-10

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US (1) US9114584B2 (en)
EP (1) EP2688741B1 (en)
JP (1) JP5950134B2 (en)
CN (1) CN103442885B (en)
FR (1) FR2972957B1 (en)
RU (1) RU2591921C2 (en)
WO (1) WO2012126930A1 (en)

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DE102018112476B4 (en) 2017-06-02 2022-01-27 Ulrich Lang Method and production plant for producing a foil substrate
US10241756B2 (en) 2017-07-11 2019-03-26 International Business Machines Corporation Tiny detection in a floating-point unit
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WO2019224364A1 (en) 2018-05-24 2019-11-28 Ulrich Lang Method and production installation for producing a film substrate
CN113954413A (en) * 2021-09-30 2022-01-21 中国原子能科学研究院 A press for sealing in shielding glove box

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Also Published As

Publication number Publication date
RU2591921C2 (en) 2016-07-20
RU2013147167A (en) 2015-04-27
FR2972957A1 (en) 2012-09-28
CN103442885B (en) 2015-08-12
CN103442885A (en) 2013-12-11
EP2688741B1 (en) 2019-04-10
US20140004220A1 (en) 2014-01-02
WO2012126930A1 (en) 2012-09-27
US9114584B2 (en) 2015-08-25
JP5950134B2 (en) 2016-07-13
FR2972957B1 (en) 2014-02-21
JP2014514160A (en) 2014-06-19

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