EP0669188A1 - Device for centering and locking a workpiece for its honing with an expandable honing tool - Google Patents

Device for centering and locking a workpiece for its honing with an expandable honing tool Download PDF

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Publication number
EP0669188A1
EP0669188A1 EP95400391A EP95400391A EP0669188A1 EP 0669188 A1 EP0669188 A1 EP 0669188A1 EP 95400391 A EP95400391 A EP 95400391A EP 95400391 A EP95400391 A EP 95400391A EP 0669188 A1 EP0669188 A1 EP 0669188A1
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EP
European Patent Office
Prior art keywords
piston
lapping
support
fluid
pinion
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Granted
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EP95400391A
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German (de)
French (fr)
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EP0669188B1 (en
Inventor
Jean-Claude Pineau
Richard Bonachera
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Procedes Machines Speciales S P M S Ste
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Procedes Machines Speciales S P M S Ste
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    • 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
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/06—Work supports, e.g. adjustable steadies
    • 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
    • B24B33/00—Honing machines or devices; Accessories therefor
    • B24B33/10—Accessories

Definitions

  • the present invention relates to a device for centering and clamping a workpiece with a view to running it in using an expansion lapper, comprising a support by which the workpiece to be lapped is applied against a fixed stop, and a set of two fluid pistons acting on said support.
  • Another known centering and clamping device specially designed for lapping pinions comprises a fixed stop against which the pinion to be lapped is applied directly by a support on which acts a set of concentric fluid pistons.
  • This assembly comprises a first fluid piston having a large stroke relative to its cylinder, and a second fluid piston interposed between the support and the first piston and having a reduced stroke relative to this latest.
  • the stroke of the first piston is fixed and is chosen so that when the first piston is at the bottom of the travel direction in the advance direction and the second piston at the bottom of the travel in the backward direction, there remains between the pinion and the support and / or the fixed stop, a slight play less than the stroke of the second piston.
  • the pinion being angularly immobilized by an anti-rotation system, then the rod lapped in rotation is engaged in the pinion and the rod is expanded until the establishment of a predetermined braking torque between the rod and the pinion, indicating that, the abrasive stones of the lapping being in contact with the bore of the pinion, the latter is centered relative to the lapping.
  • the second piston is then fed in the direction of advance so that the pinion thus centered is clamped by the support against the fixed stop, for its running-in.
  • This known device while offering advantages compared to the cassette device (fewer wear parts, possibility of making the pinion-bearing and pinion-abutment contact surfaces coincide with reference surfaces recessed on the pinion), nevertheless has the disadvantage that the stroke of the first piston is fixed and predetermined, so that each time a pinion having an axial thickness given to a pinion having another axial thickness, it is necessary to also change the stopper replace it with a stop having a complementary axial dimension.
  • the present invention relates to a device for centering and clamping a part with a view to lapping it using an expansion lapping device, a device which, while being of simple structure, can be used without modification for the lapping of parts with different axial thicknesses.
  • the first piston therefore has a stroke which is independent of the axial thickness of the part to be lapped, so that the device can be used interchangeably for clamping parts having different axial thicknesses.
  • the first piston performs a stroke in the direction of advance which is automatically adapted to the axial thickness of the part to be lapped and is then locked in its position until the end of lapping.
  • the second piston performs a predetermined fixed stroke which is independent of the axial thickness of the part to be lapped.
  • step (e) it is possible, following step (e), to f) supply the first piston with fluid in the direction of advance and remove the blocking of the first piston by its blocking element, until the end of the running-in operation of the part.
  • step c) the supply of fluid to the second piston in the reverse direction according to step c) is effected through the first piston, in which case step c) also includes the supply of fluid to the first piston in the reverse direction.
  • blocking element can be used to block the first piston in its cylinder, it is advantageous for this blocking element to be constituted by a fluid tightening sleeve, of a type known per se.
  • a pinion 1 whose bore must be run in is brought by means not shown, on a support surface 2, below a stop 3 installed in a fixed position, at a distance above the surface 2 , on a support 3a.
  • the support 3a and the stop 3 are traversed by a through hole for the introduction, from the top, of an expansion lapping 4 into the bore of the pinion 1.
  • This device comprises a cylinder 6 in which is vertically movable back and forth a first piston 7 serving itself guide to a second piston 8 extended upwards by a rod 8a which carries, by means of a swivel bearing 9, a support piece 10 for the pinion 1 to be lapped.
  • the support piece 10 which is hollowed out in its upper part to be able to receive the lower end of the lapping 4 is movable, under the action of the two pistons 7 and 8, in a hole 11 in the support surface 2, for lifting and clamp the pinion 1 against the stopper 3.
  • a fluid clamping sleeve 12 is fixed in the cylinder 6, around a rod 7a which extends the piston 7 downwards beyond the cylinder 6 at its lower part.
  • the first piston 7 can be supplied with pressurized fluid in the direction of advance, on its lower face by a connector 13 and in the reverse direction on its upper face by a connector 14 on the cylinder 6.
  • the second piston 8 can be supplied with pressurized fluid in the direction of advance, on its lower face by a connector 15 provided on the rod 7a and in the reverse direction on its upper face by a passage 16 formed in the piston 7 and communicating with the connector supply 14 of the latter.
  • the clamping sleeve 12 can be supplied with fluid by a fitting 17 on the cylinder 6.
  • the support 3a carries a finger 18 projecting downwards to serve as an anti-rotation element for the pinion 1, as described in more detail below.
  • the various fluid elements of the device 5 are supplied, by a command, as described below.
  • the pressurized connections 13 and 15 are supplied with pressurized fluid to move the two pistons 7 and 8 in the direction of advance (upwards), namely the piston 8 at the bottom of the travel in the direction of advance and the piston 7 in the direction of advance until the pinion 1 is clamped by the support piece 10 against the stopper 3.
  • the finger 18 of the support 3a of the stopper 3 automatically engages with teeth of pinion 1 and prevents rotation of the latter.
  • the clamping sleeve 12 is supplied with pressurized fluid through its connector 17, so that the sleeve 12 blocks the rod 7a of the piston 8 in its position relative to the cylinder 6.
  • a third step the supply of pressurized fluid to the first piston 7 and to the second piston 8 is reversed, by putting pressurized the connection 15 and pressurized the connection 14 and, consequently, the passage 16 which communicates with the connection 14.
  • the first piston 7 blocked by the clamping sleeve 12 does not change position, while the second piston 8 is is thus brought to the bottom of the travel in the reverse direction (down).
  • the support piece 10 descends from the value of the stroke of the second piston 8 and thus debrides the pinion 1 while maintaining it in engagement with the finger 18.
  • the expansion lapping 4 is introduced from the top, through the support 3a and the stop 3, into the bore of the pinion 1 and, while driving the lapping in rotation, the latter is made to expand so that its lapping stones come into contact with the bore of the pinion 1 to be lapped.
  • This expansion continues until a predetermined torque is measured, by a torque detector, between the lapping 4 and the pinion 1 angularly immobilized by the finger 18. The detection of this torque is the sign that the pinion 1 is is perfectly centered on the lap.
  • a fifth step the supply of the second piston 8 is again reversed, by pressurizing its connector 15, so that the piston 8 is brought back to the end of travel in the direction of advance (upwards). and re-clamps against the stop 3 the pinion 1 previously centered by the lapping 4.
  • the actual lapping of the pinion 1 can then be carried out by the lapping 4, the device 5 remaining in the same position.
  • the stroke of the second piston 8 can be very short (of the order of 0.5 mm) since this piston has the sole function of allowing, after clamping the pinion, an unclamping of the pinion with a view to centering the latter by the lapping 4 and then re-clamping the pinion after centering by the lapping 4.
  • the first piston 7 must on the other hand have a sufficient stroke to allow the clamping, against the same fixed stop 3, of all the pinions 1 to be run in, that is to say compensation for the differences in axial thickness that these pinions 1 may have between their two opposite reference surfaces coming into contact one with the fixed stop 3 and the other with the movable support piece 10 of the device 5.
  • the anti-rotation finger 18 is a fixed, uncontrolled part, which is not stressed during the actual running-in, the pinion then being immobilized angularly by its blocking against the stop 3.
  • the hydraulic control 19 of the device 5 comprises three sub-assemblies 20, 21 and 22.
  • the hydraulic control 19 of the device 5 is completed by an electronic control 23 which controls the progress of the sequences as described above, by making use of a measurement of the torque on the lapping 4 (detector element 24) to define the end of the pinion centering cycle 1.
  • This torque measurement can be done, for example, by measuring the current absorbed by the electric motor for driving the lapping, or in any other manner known per se.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)

Abstract

Two concentric fluid pistons (7,8) act on the support (10) for the piece (1), the first piston (7) having a large travel. The second piston (8), with a reduced travel, is inserted between the support and the first piston. A fixed part (18) mating with a gear tooth prevents angular movement of the piece. The two pistons are supplied with fluid to advance them and restrain the piece by the support against the stop. The first piston is then locked by a part (12) relative to its cylinder. The supply of the second piston is then reversed in order to return it to the bottom of its travel and release the piece. The grinder (4) is introduced into the piece, rotated, and expanded to establish a predetermined torque between it and the piece, which is thus centred. The second piston supply is again reversed to return it to the bottom of its travel to restrain again the centred piece against the stop.

Description

La présente invention se rapporte à un dispositif de centrage et de bridage d'une pièce en vue de son rodage à l'aide d'un rodoir à expansion, comprenant un appui par lequel la pièce à roder est appliquée contre une butée fixe, et un ensemble de deux pistons à fluide agissant sur ledit appui.The present invention relates to a device for centering and clamping a workpiece with a view to running it in using an expansion lapper, comprising a support by which the workpiece to be lapped is applied against a fixed stop, and a set of two fluid pistons acting on said support.

Pour le rodage de pièces telles que des pignons de boîtes de vitesses, il est connu de placer les pignons avec un léger jeu axial dans des cassettes qui sont maintenues par un dispositif de suspension à cardan pendant le rodage, un dispositif anti-rotation étant prévu pour empêcher la rotation du pignon sous l'effet du rodoir. Les principaux inconvénients de ce mode de rodage consistent dans le fait qu'il faut placer chaque pignon à roder dans une cassette adaptée, que la cassette et sa suspension présentent de nombreuses pièces d'usure, que le dispositif anti-rotation qui assure l'immobilisation angulaire du pignon pendant son rodage doit être dimensionné en conséquence et que dans le cas de pignons dont les faces de référence se trouvent en retrait, les faces de contact du pignon avec la cassette ne coïncident pas avec ses faces de référence.For lapping of parts such as gearbox gears, it is known to place the pinions with a slight axial clearance in cassettes which are held by a cardanic suspension device during running in, an anti-rotation device being provided to prevent rotation of the pinion under the effect of the lapping. The main drawbacks of this running-in method consist in the fact that each sprocket to be run-in must be placed in a suitable cassette, that the cassette and its suspension have many wearing parts, and that the anti-rotation device which ensures the angular immobilization of the pinion during its running-in must be dimensioned accordingly and that in the case of pinions whose reference faces are set back, the contact faces of the pinion with the cassette do not coincide with its reference faces.

Un autre dispositif de centrage et de bridage connu conçu spécialement pour le rodage de pignons comprend une butée fixe contre laquelle le pignon à roder est appliqué directement par un appui sur lequel agit un ensemble de pistons à fluide concentriques. Cet ensemble comprend un premier piston à fluide ayant une grande course par rapport à son cylindre, et un second piston à fluide intercalé entre l'appui et le premier piston et ayant une course réduite par rapport à ce dernier. La course du premier piston est fixe et est choisie de manière que lorsque le premier piston se trouve à fond de course dans le sens d'avance et le second piston à fond de course dans le sens de recul, il subsiste, entre le pignon et l'appui et/ou la butée fixe, un léger jeu inférieur à la course du second piston. Le pignon étant immobilisé angulairement par un système anti-rotation, on engage ensuite dans le pignon le rodoir entraîné en rotation et on fait expanser le rodoir jusqu'à l'établissement d'un couple de freinage prédéterminé entre le rodoir et le pignon, indiquant que, les pierres abrasives du rodoir se trouvant en contact avec l'alésage du pignon, ce dernier se trouve centré par rapport au rodoir. On alimente ensuite le second piston dans le sens d'avance de manière que le pignon ainsi centré se trouve bridé par l'appui contre la butée fixe, en vue de son rodage.Another known centering and clamping device specially designed for lapping pinions comprises a fixed stop against which the pinion to be lapped is applied directly by a support on which acts a set of concentric fluid pistons. This assembly comprises a first fluid piston having a large stroke relative to its cylinder, and a second fluid piston interposed between the support and the first piston and having a reduced stroke relative to this latest. The stroke of the first piston is fixed and is chosen so that when the first piston is at the bottom of the travel direction in the advance direction and the second piston at the bottom of the travel in the backward direction, there remains between the pinion and the support and / or the fixed stop, a slight play less than the stroke of the second piston. The pinion being angularly immobilized by an anti-rotation system, then the rod lapped in rotation is engaged in the pinion and the rod is expanded until the establishment of a predetermined braking torque between the rod and the pinion, indicating that, the abrasive stones of the lapping being in contact with the bore of the pinion, the latter is centered relative to the lapping. The second piston is then fed in the direction of advance so that the pinion thus centered is clamped by the support against the fixed stop, for its running-in.

Ce dispositif connu, tout en offrant des avantages par rapport au dispositif à cassette (moins de pièces d'usure, possibilité de faire coïncider les surfaces de contact pignon-appui et pignon-butée avec des surfaces de référence en retrait sur le pignon), présente néanmoins l'inconvénient que la course du premier piston est fixe et prédéterminée, de sorte qu'à chaque passage d'un pignon ayant une épaisseur axiale donnée à un pignon ayant une autre épaisseur axiale, il est nécessaire de changer également la butée pour la remplacer par une butée ayant une dimension axiale complémentaire.This known device, while offering advantages compared to the cassette device (fewer wear parts, possibility of making the pinion-bearing and pinion-abutment contact surfaces coincide with reference surfaces recessed on the pinion), nevertheless has the disadvantage that the stroke of the first piston is fixed and predetermined, so that each time a pinion having an axial thickness given to a pinion having another axial thickness, it is necessary to also change the stopper replace it with a stop having a complementary axial dimension.

La présente invention vise un dispositif de centrage et de bridage d'une pièce en vue de son rodage à l'aide d'un rodoir à expansion, dispositif qui, tout en étant de structure simple, puisse être utilisé sans modification pour le rodage de pièces ayant des épaisseurs axiales différentes.The present invention relates to a device for centering and clamping a part with a view to lapping it using an expansion lapping device, a device which, while being of simple structure, can be used without modification for the lapping of parts with different axial thicknesses.

L'invention a pour objet un dispositif de centrage et de bridage d'une pièce, notamment d'un pignon, en vue de son rodage à l'aide d'un rodoir à expansion, comprenant un appui par lequel la pièce à roder est appliquée contre une butée fixe, et un ensemble de deux pistons à fluide concentriques agissant sur ledit appui, à savoir un premier piston à fluide à grande course et un second piston à fluide à course réduite intercalé entre l'appui et le premier piston, et des moyens d'immobilisation angulaire de la pièce à roder. Selon l'invention, le dispositif comprend, en outre, un élément de blocage pour bloquer à volonté le premier piston dans sa position par rapport à son cylindre. Le dispositif comprend, par ailleurs, une commande adaptée, pour, successivement,

  • a) alimenter les deux pistons en fluide dans le sens d'avance de manière à brider la pièce par l'appui contre la butée, le second piston étant à fond de course dans le sens d'avance,
  • b) bloquer le premier piston dans sa position par rapport au cylindre à l'aide de l'élément de blocage,
  • c) inverser l'alimentation du second piston pour l'amener à fond de course dans le sens de recul, et débrider ainsi la pièce,
  • d) introduire le rodoir dans la pièce immobilisée angulairement par les moyens anti-rotation et, en l'entraînant en rotation, faire expanser le rodoir jusqu'à l'établissement d'un couple prédéterminé entre le rodoir et la pièce qui se trouve ainsi centrée, et
  • e) inverser de nouveau l'alimentation du second piston pour le ramener à fond de course dans le sens d'avance et rebrider la pièce contre la butée.
The subject of the invention is a device for centering and clamping a part, in particular a pinion, for its lapping using an expansion lapping, comprising a support by which the part to be lapped is applied against a fixed stop, and a set of two concentric fluid pistons acting on said support, namely a first long stroke fluid piston and a second short stroke fluid piston interposed between the support and the first piston, and means for angular immobilization of the part to be lapped. According to the invention, the device further comprises a blocking element for blocking the first piston at will in its position relative to its cylinder. The device also comprises an adapted control, for, successively,
  • a) supplying the two pistons with fluid in the direction of advance so as to clamp the part by pressing against the stop, the second piston being at the bottom of the stroke in the direction of advance,
  • b) block the first piston in its position relative to the cylinder using the blocking element,
  • c) reverse the supply of the second piston to bring it to the full stroke in the reverse direction, and thus unclamp the part,
  • d) introduce the lapping machine into the piece immobilized angularly by the anti-rotation means and, by driving it in rotation, cause the lapping machine to expand until a predetermined torque is established between the lapping machine and the part which is thus centered, and
  • e) reverse the supply of the second piston again to bring it back to full travel in the advance direction and re-clamp the part against the stop.

Sur le dispositif conforme à l'invention, le premier piston présente donc une course qui est indépendante de l'épaisseur axiale de la pièce à roder, de sorte que le dispositif peut être utilisé indifféremment pour brider des pièces ayant des épaisseurs axiales différentes. Le premier piston effectue dans le sens d'avance une course qui est automatiquement adaptée à l'épaisseur axiale de la pièce à roder et est ensuite bloqué dans sa position jusqu'à la fin du rodage. Le second piston effectue une course fixe prédéterminée qui est indépendante de l'épaisseur axiale de la pièce à roder.On the device according to the invention, the first piston therefore has a stroke which is independent of the axial thickness of the part to be lapped, so that the device can be used interchangeably for clamping parts having different axial thicknesses. The first piston performs a stroke in the direction of advance which is automatically adapted to the axial thickness of the part to be lapped and is then locked in its position until the end of lapping. The second piston performs a predetermined fixed stroke which is independent of the axial thickness of the part to be lapped.

Afin que, à la suite du bridage après centrage de la pièce, la poussée exercée par le rodoir sur la pièce à roder, pendant le rodage de cette dernière, n'ait pas à être supportée par l'élément de blocage du premier piston, il est possible, à la suite de l'étape (e), de
   f) alimenter le premier piston en fluide dans le sens d'avance et supprimer le blocage du premier piston par son élément de blocage, jusqu'à la fin de l'opération de rodage de la pièce.So that, following the clamping after centering of the part, the thrust exerted by the lapping on the part to be lapped, during the lapping of the latter, does not have to be supported by the blocking element of the first piston, it is possible, following step (e), to
f) supply the first piston with fluid in the direction of advance and remove the blocking of the first piston by its blocking element, until the end of the running-in operation of the part.

De préférence, l'alimentation en fluide du second piston dans le sens de recul selon l'étape c) s'effectue à travers le premier piston, auquel cas l'étape c) comprend également l'alimentation en fluide du premier piston dans le sens de recul.Preferably, the supply of fluid to the second piston in the reverse direction according to step c) is effected through the first piston, in which case step c) also includes the supply of fluid to the first piston in the reverse direction.

Bien que d'autres éléments de blocage puissent être utilisés pour bloquer le premier piston dans son cylindre, il est avantageux que cet élément de blocage soit constitué par un manchon de serrage à fluide, de type connu en soi.Although other blocking elements can be used to block the first piston in its cylinder, it is advantageous for this blocking element to be constituted by a fluid tightening sleeve, of a type known per se.

En se référant aux dessins schématiques annexés, on va décrire ci-après plus en détail un mode de réalisation illustratif et non limitatif d'un dispositif conforme à l'invention; sur les dessins :

  • la figure 1 est une coupe d'un dispositif de centrage et de bridage conforme à l'invention, en position de repos;
  • la figure 2 est une coupe du dispositif de la figure 1 en position de bridage,
  • la figure 3 représente un schéma de la commande hydraulique du dispositif des figures 1 et 2;
  • la figure 4 représente un schéma de principe de l'ensemble de la commande.
Referring to the appended schematic drawings, there will be described below in more detail an illustrative and nonlimiting embodiment of a device according to the invention; on the drawings:
  • Figure 1 is a section of a centering and clamping device according to the invention, in the rest position;
  • FIG. 2 is a section through the device of FIG. 1 in the clamping position,
  • Figure 3 shows a diagram of the hydraulic control of the device of Figures 1 and 2;
  • Figure 4 shows a block diagram of the entire control.

Selon la figure 1, un pignon 1 dont l'alésage doit être rodé est amené par des moyens non représentés, sur une surface de support 2, en dessous d'une butée 3 installée en position fixe, à distance au dessus de la surface 2, sur un support 3a. Le support 3a et la butée 3 sont traversés par un trou de passage pour l'introduction, depuis le haut, d'un rodoir à expansion 4 dans l'alésage du pignon 1.According to Figure 1, a pinion 1 whose bore must be run in is brought by means not shown, on a support surface 2, below a stop 3 installed in a fixed position, at a distance above the surface 2 , on a support 3a. The support 3a and the stop 3 are traversed by a through hole for the introduction, from the top, of an expansion lapping 4 into the bore of the pinion 1.

En dessous de la surface 2 est installé un dispositif 5 pour le centrage et le bridage du pignon 1 sur la butée 3. Ce dispositif comprend un cylindre 6 dans lequel est mobile verticalement en va-et-vient un premier piston 7 servant lui-même de guide à un second piston 8 prolongé vers le haut par une tige 8a qui porte, par l'intermédiaire d'un palier à rotule 9, une pièce d'appui 10 pour le pignon 1 à roder. La pièce d'appui 10 qui est évidée dans sa partie supérieure pour pouvoir recevoir l'extrémité inférieure du rodoir 4 est mobile, sous l'action des deux pistons 7 et 8, dans un trou 11 de la surface de support 2, pour soulever et brider le pignon 1 contre la butée 3.Below the surface 2 is installed a device 5 for centering and clamping the pinion 1 on the stop 3. This device comprises a cylinder 6 in which is vertically movable back and forth a first piston 7 serving itself guide to a second piston 8 extended upwards by a rod 8a which carries, by means of a swivel bearing 9, a support piece 10 for the pinion 1 to be lapped. The support piece 10 which is hollowed out in its upper part to be able to receive the lower end of the lapping 4 is movable, under the action of the two pistons 7 and 8, in a hole 11 in the support surface 2, for lifting and clamp the pinion 1 against the stopper 3.

Un manchon de serrage 12 à fluide est fixé dans le cylindre 6, autour d'une tige 7a qui prolonge le piston 7 vers le bas en dépassant le cylindre 6 à sa partie inférieure.A fluid clamping sleeve 12 is fixed in the cylinder 6, around a rod 7a which extends the piston 7 downwards beyond the cylinder 6 at its lower part.

Le premier piston 7 peut être alimenté en fluide sous pression dans le sens d'avance, sur sa face inférieure par un raccord 13 et dans le sens de recul sur sa face supérieure par un raccord 14 sur le cylindre 6. Le second piston 8 peut être alimenté en fluide sous pression dans le sens d'avance, sur sa face inférieure par un raccord 15 prévu sur la tige 7a et dans le sens de recul sur sa face supérieure par un passage 16 ménagé dans le piston 7 et communiquant avec le raccord d'alimentation 14 de ce dernier.The first piston 7 can be supplied with pressurized fluid in the direction of advance, on its lower face by a connector 13 and in the reverse direction on its upper face by a connector 14 on the cylinder 6. The second piston 8 can be supplied with pressurized fluid in the direction of advance, on its lower face by a connector 15 provided on the rod 7a and in the reverse direction on its upper face by a passage 16 formed in the piston 7 and communicating with the connector supply 14 of the latter.

Le manchon de serrage 12 peut être alimenté en fluide par un raccord 17 sur le cylindre 6.The clamping sleeve 12 can be supplied with fluid by a fitting 17 on the cylinder 6.

Il y a encore lieu de noter que le support 3a porte un doigt 18 faisant saillie vers le bas pour servir d'élément anti-rotation pour le pignon 1, de la manière décrite plus en détail ci-après.It should also be noted that the support 3a carries a finger 18 projecting downwards to serve as an anti-rotation element for the pinion 1, as described in more detail below.

Sur la figure 1, le dispositif 5 est représenté en position de repos, les deux pistons 7 et 8 se trouvant en position de recul (position basse) et le manchon de serrage 12 étant desserré.In Figure 1, the device 5 is shown in the rest position, the two pistons 7 and 8 being in the backward position (low position) and the clamping sleeve 12 being loosened.

Pour brider le pignon 1 contre la butée 3 et le centrer sur la butée 3 ou plutôt sur le rodoir 4 qui doit roder l'alésage du pignon 1 en traversant la butée 3, on alimente les différents éléments à fluide du dispositif 5, par une commande, de la manière décrite ci-après.To clamp the pinion 1 against the stop 3 and center it on the stop 3 or rather on the lapping 4 which must break in the bore of the pinion 1 by crossing the stop 3, the various fluid elements of the device 5 are supplied, by a command, as described below.

Dans un premier temps, on alimente en fluide sous pression les raccords 13 et 15 pour déplacer les deux pistons 7 et 8 dans le sens d'avance (vers le haut), à savoir le piston 8 à fond de course dans le sens d'avance et le piston 7 dans le sens d'avance jusqu'au bridage du pignon 1 par la pièce d'appui 10 contre la butée 3. Dans cette position, le doigt 18 du support 3a de la butée 3 entre automatiquement en prise avec des dents du pignon 1 et empêche la rotation de ce dernier.Firstly, the pressurized connections 13 and 15 are supplied with pressurized fluid to move the two pistons 7 and 8 in the direction of advance (upwards), namely the piston 8 at the bottom of the travel in the direction of advance and the piston 7 in the direction of advance until the pinion 1 is clamped by the support piece 10 against the stopper 3. In this position, the finger 18 of the support 3a of the stopper 3 automatically engages with teeth of pinion 1 and prevents rotation of the latter.

Dans un deuxième temps, on alimente le manchon de serrage 12 en fluide sous pression par son raccord 17, de sorte que le manchon 12 bloque la tige 7a du piston 8 dans sa position par rapport au cylindre 6.In a second step, the clamping sleeve 12 is supplied with pressurized fluid through its connector 17, so that the sleeve 12 blocks the rod 7a of the piston 8 in its position relative to the cylinder 6.

Dans un troisième temps, on inverse l'alimentation en fluide sous pression du premier piston 7 et du second piston 8, en mettant hors pression le raccord 15 et sous pression le raccord 14 et, par conséquent, le passage 16 qui communique avec le raccord 14. Le premier piston 7 bloqué par le manchon de serrage 12 ne change pas de position, tandis que le second piston 8 se trouve ainsi amené à fond de course dans le sens de recul (vers le bas). De ce fait, la pièce d'appui 10 descend de la valeur de la course du second piston 8 et débride ainsi le pignon 1 tout en le maintenant en prise avec le doigt 18.In a third step, the supply of pressurized fluid to the first piston 7 and to the second piston 8 is reversed, by putting pressurized the connection 15 and pressurized the connection 14 and, consequently, the passage 16 which communicates with the connection 14. The first piston 7 blocked by the clamping sleeve 12 does not change position, while the second piston 8 is is thus brought to the bottom of the travel in the reverse direction (down). As a result, the support piece 10 descends from the value of the stroke of the second piston 8 and thus debrides the pinion 1 while maintaining it in engagement with the finger 18.

Dans un quatrième temps, on introduit depuis le haut, à travers le support 3a et la butée 3, le rodoir à expansion 4 dans l'alésage du pignon 1 et, tout en entraînant en rotation le rodoir, on fait expanser ce dernier de manière que ses pierres de rodage entrent en contact avec l'alésage du pignon 1 à roder. Cette expansion se poursuit jusqu'à ce qu'un couple prédéterminé soit mesuré, par un détecteur de couple, entre le rodoir 4 et le pignon 1 immobilisé angulairement par le doigt 18. La détection de ce couple est le signe que le pignon 1 se trouve parfaitement centré sur le rodoir.In a fourth step, the expansion lapping 4 is introduced from the top, through the support 3a and the stop 3, into the bore of the pinion 1 and, while driving the lapping in rotation, the latter is made to expand so that its lapping stones come into contact with the bore of the pinion 1 to be lapped. This expansion continues until a predetermined torque is measured, by a torque detector, between the lapping 4 and the pinion 1 angularly immobilized by the finger 18. The detection of this torque is the sign that the pinion 1 is is perfectly centered on the lap.

Dans un cinquième temps, on inverse de nouveau l'alimentation du second piston 8, par mise sous pression de son raccord 15, de sorte que le piston 8 se trouve ramené à fond de course dans le sens d'avance (vers le haut) et rebride contre la butée 3 le pignon 1 préalablement centré par le rodoir 4.In a fifth step, the supply of the second piston 8 is again reversed, by pressurizing its connector 15, so that the piston 8 is brought back to the end of travel in the direction of advance (upwards). and re-clamps against the stop 3 the pinion 1 previously centered by the lapping 4.

Le rodage proprement dit du pignon 1 peut ensuite être effectué par le rodoir 4, le dispositif 5 restant dans la même position.The actual lapping of the pinion 1 can then be carried out by the lapping 4, the device 5 remaining in the same position.

Toutefois, afin de ne pas faire supporter au manchon de serrage 12 la poussée que le rodoir 4 exerce sur le pignon 1 pendant le rodage, il est possible, lorsque le pignon 1 est centré et bridé, avant de procéder au rodage proprement dit, d'alimenter le premier piston 7 dans le sens d'avance par le raccord 13 et de supprimer ensuite l'alimentation du manchon de serrage 12 par le raccord 17, de sorte que le manchon 12 débloque la tige 7a et le piston 7, le pignon 1 étant alors maintenu bridé contre la butée 3 par le piston 7 (et le piston 8).However, in order not to make the clamping sleeve 12 bear the thrust that the lapping 4 exerts on the pinion 1 during the running-in, it is possible, when the pinion 1 is centered and clamped, before proceeding with the running-in itself, d '' feed the first piston 7 in the direction of advance through the connector 13 and then remove the supply of the clamping sleeve 12 through the connector 17, so that the sleeve 12 releases the rod 7a and the piston 7, the pinion 1 then being held flanged against the stop 3 by the piston 7 (and the piston 8).

La course du second piston 8 peut être très faible (de l'ordre de 0,5 mm) puisque ce piston a pour fonction unique de permettre, après bridage du pignon, un débridage du pignon en vue du centrage de ce dernier par le rodoir 4 et, ensuite, un rebridage du pignon après centrage par le rodoir 4.The stroke of the second piston 8 can be very short (of the order of 0.5 mm) since this piston has the sole function of allowing, after clamping the pinion, an unclamping of the pinion with a view to centering the latter by the lapping 4 and then re-clamping the pinion after centering by the lapping 4.

Le premier piston 7 doit par contre présenter une course suffisante pour permettre le bridage, contre une même butée 3 fixe, de tous les pignons 1 à roder, c'est-à-dire la compensation des différences d'épaisseur axiale que ces pignons 1 peuvent présenter entre leurs deux surfaces de référence opposées entrant en contact l'une avec la butée 3 fixe et l'autre avec la pièce d'appui 10 mobile du dispositif 5.The first piston 7 must on the other hand have a sufficient stroke to allow the clamping, against the same fixed stop 3, of all the pinions 1 to be run in, that is to say compensation for the differences in axial thickness that these pinions 1 may have between their two opposite reference surfaces coming into contact one with the fixed stop 3 and the other with the movable support piece 10 of the device 5.

Il est à noter que le doigt anti-rotation 18 est une pièce fixe, non commandée, qui n'est pas sollicitée pendant le rodage proprement dit, le pignon étant alors immobilisé angulairement par son blocage contre la butée 3.It should be noted that the anti-rotation finger 18 is a fixed, uncontrolled part, which is not stressed during the actual running-in, the pinion then being immobilized angularly by its blocking against the stop 3.

Selon la figure 3, la commande hydraulique 19 du dispositif 5 comprend trois sous-ensembles 20, 21 et 22. Le sous-ensemble 20 d'avance/recul du piston 7, relié aux raccords 13 et 14, commande l'avance et le recul du piston 7 (et le recul du piston 8) et comprend un électro-distributeur 4/3 (quatre orifices, trois positions) un régulateur de pression et deux limiteurs de débit (clapets anti-retour avec étrangleurs). Le sous-ensemble 21 d'avance du piston 8, relié au raccord 15, commande l'avance du piston 8 et comprend un électro-distributeur 4/2 (quatre orifices dont un bouché, deux positions), un régulateur de pression et un limiteur de débit. Le sous-ensemble 22 de blocage du piston 7, relié au raccord 17, commande le serrage/desserrage du manchon 12 et comprend un électro-distributeur 3/2 et son régulateur de pression.According to FIG. 3, the hydraulic control 19 of the device 5 comprises three sub-assemblies 20, 21 and 22. The sub-assembly 20 for forward / backward movement of the piston 7, connected to the fittings 13 and 14, controls the advance and the recoil of piston 7 (and recoil of piston 8) and includes a 4/3 solenoid valve (four ports, three positions) a pressure regulator and two flow limiters (check valves with throttles). The sub-assembly 21 for advancing the piston 8, connected to the connector 15, controls the advance of the piston 8 and comprises a 4/2 directional solenoid valve (four orifices including one plugged, two positions), a pressure regulator and a flow restrictor. The sub-assembly 22 for blocking the piston 7, connected to the connector 17, controls the tightening / loosening of the sleeve 12 and includes a 3/2 solenoid valve and its pressure regulator.

Selon la figure 4, la commande hydraulique 19 du dispositif 5 est complétée par une commande électronique 23 qui contrôle le déroulement des séquences tel que décrit ci-dessus, en faisant intervenir une mesure du couple sur le rodoir 4 (élément détecteur 24) pour définir la fin du cycle de centrage du pignon 1. Cette mesure de couple peut se faire, par exemple, par mesure du courant absorbé par le moteur électrique d'entraînement du rodoir, ou de toute autre manière connue en soi.According to FIG. 4, the hydraulic control 19 of the device 5 is completed by an electronic control 23 which controls the progress of the sequences as described above, by making use of a measurement of the torque on the lapping 4 (detector element 24) to define the end of the pinion centering cycle 1. This torque measurement can be done, for example, by measuring the current absorbed by the electric motor for driving the lapping, or in any other manner known per se.

Il y a lieu de noter que dans le cadre de l'invention, le recul du piston 7, au lieu de se faire par fluide (raccord 14 et passage 16), pourrait être produit également par un ressort de rappel.It should be noted that in the context of the invention, the retraction of the piston 7, instead of being done by fluid (connector 14 and passage 16), could also be produced by a return spring.

Claims (5)

Dispositif de centrage et de bridage d'une pièce (1) en vue de son rodage à l'aide d'un rodoir à expansion (4), comprenant un appui (10) par lequel la pièce (1) à roder est appliquée contre une butée fixe (3), un ensemble de deux pistons à fluide concentriques (7,8) agissant sur ledit appui (10), ledit ensemble étant composé dun premier piston (7) à grande course et d'un second piston (8) à course réduite intercalé entre ledit appui (10) et le premier piston (7), et des moyens anti-rotation (18) pour immobiliser angulairement la pièce à roder, caractérisé par le fait qu'il comprend, en outre, un élément de blocage (12) pour bloquer à volonté le premier piston (7) par rapport à son cylindre (6), et une commande adaptée pour, successivement, a) - alimenter les deux pistons (7,8) en fluide dans le sens d'avance de manière à brider la pièce (1) par l'appui (10) contre la butée (3), le second piston (8) étant à fond de course dans le sens d'avance, b) - bloquer le premier piston (7) dans sa position par rapport à son cylindre (6) par l'élément de blocage (12) c) - inverser l'alimentation du second piston (8) pour l'amener à fond de course dans le sens de recul et débrider la pièce (1), d) - introduire le rodoir (4) dans la pièce (1) immobilisée angulairement par les moyens anti-rotation (18) et, en l'entraînant en rotation, faire expanser le rodoir (4) jusqu'à l'établissement d'un couple prédéterminé entre le rodoir et la pièce (1) qui se trouve ainsi centrée, et e) - inverser de nouveau l'alimentation du second piston (8) pour ramener ce dernier à fond de course dans le sens d'avance et rebrider contre la butée (3) la pièce (1) ainsi centrée. Device for centering and clamping a workpiece (1) with a view to lapping it using an expansion lapper (4), comprising a support (10) by which the workpiece (1) to be lapped is applied against a fixed stop (3), a set of two concentric fluid pistons (7,8) acting on said support (10), said set consisting of a first piston (7) with large stroke and a second piston (8) short stroke interposed between said support (10) and the first piston (7), and anti-rotation means (18) for angularly immobilizing the workpiece, characterized in that it further comprises an element of blocking (12) to block the first piston (7) relative to its cylinder (6) at will, and a control adapted to successively a) - supply the two pistons (7,8) with fluid in the direction of advance so as to clamp the part (1) by the support (10) against the stop (3), the second piston (8) being all the way in the direction of advance, b) - block the first piston (7) in its position relative to its cylinder (6) by the locking element (12) c) - reverse the supply of the second piston (8) to bring it to the bottom of the travel in the reverse direction and unclamp the part (1), d) - introduce the lapping (4) into the part (1) angularly immobilized by the anti-rotation means (18) and, by driving it in rotation, expand the lapping (4) until the establishment of a predetermined torque between the lapping pin and the part (1) which is thus centered, and e) - reverse the supply of the second piston (8) again to bring the latter back to full travel in the direction of advance and re-clamp against the stop (3) the part (1) thus centered. Dispositif suivant la revendication 1, caractérisé par le fait que la commande est adaptée pour permettre, à la suite de l'étape e), de
   f) alimenter le premier piston (7) dans le sens d'avance et débloquer l'élément de blocage (12) jusqu'à la fin de l'opération de rodage de la pièce.Device according to claim 1, characterized in that the control is adapted to allow, following step e), to
f) supply the first piston (7) in the direction of advance and release the locking element (12) until the end of the running-in operation of the room. Dispositif suivant la revendication 1, caractérisé par le fait que l'alimentation en fluide du second piston (8) dans le sens de recul se fait par l'alimentation en fluide du premier piston (7) dans le sens de recul.Device according to claim 1, characterized in that the fluid supply to the second piston (8) in the reverse direction is effected by the fluid supply to the first piston (7) in the reverse direction. Dispositif suivant l'une quelconque des revendications précédentes, caractérisé par le fait que l'élément de blocage du premier piston (7) est constitué par un manchon de serrage (13) à fluide fixé au cylindre (6) du premier piston (7).Device according to any one of the preceding claims, characterized in that the blocking element of the first piston (7) consists of a fluid clamping sleeve (13) fixed to the cylinder (6) of the first piston (7) . Dispositif suivant l'une quelconque des revendications précédentes pour le rodage de pignons, caractérisé par le fait que les moyens anti-rotation (18) sont constitués par un élément (18) fixe coopérant avec la denture du pignon (1).Device according to any one of the preceding claims for lapping pinions, characterized in that the anti-rotation means (18) consist of a fixed element (18) cooperating with the teeth of the pinion (1).
EP95400391A 1994-02-28 1995-02-24 Device for centering and locking a workpiece for its honing with an expandable honing tool Expired - Lifetime EP0669188B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9402256 1994-02-28
FR9402256A FR2716640B1 (en) 1994-02-28 1994-02-28 Device for centering and blocking a workpiece with a view to running it in using an expansion lapper.

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EP0669188A1 true EP0669188A1 (en) 1995-08-30
EP0669188B1 EP0669188B1 (en) 1999-01-13

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EP (1) EP0669188B1 (en)
DE (1) DE69507173T2 (en)
ES (1) ES2125568T3 (en)
FR (1) FR2716640B1 (en)

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CN110281150A (en) * 2019-07-31 2019-09-27 沈阳建筑大学 A kind of piston power plant for ceramic bearing ring interior raceway groove clamping tool

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DE69507173D1 (en) 1999-02-25
EP0669188B1 (en) 1999-01-13
FR2716640A1 (en) 1995-09-01
DE69507173T2 (en) 1999-09-16
US5667425A (en) 1997-09-16
ES2125568T3 (en) 1999-03-01
FR2716640B1 (en) 1996-05-03

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