EP2197624A1 - Precision guiding device in a machine for machining cylindrical parts - Google Patents

Precision guiding device in a machine for machining cylindrical parts

Info

Publication number
EP2197624A1
EP2197624A1 EP08807473A EP08807473A EP2197624A1 EP 2197624 A1 EP2197624 A1 EP 2197624A1 EP 08807473 A EP08807473 A EP 08807473A EP 08807473 A EP08807473 A EP 08807473A EP 2197624 A1 EP2197624 A1 EP 2197624A1
Authority
EP
European Patent Office
Prior art keywords
spindle
spindle assembly
shaft
elements
clamp
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.)
Withdrawn
Application number
EP08807473A
Other languages
German (de)
French (fr)
Inventor
Pierre-Louis Piguet
Pierre Pahud
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.)
Rollomatic SA
Original Assignee
Rollomatic 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 Rollomatic SA filed Critical Rollomatic SA
Priority to EP08807473A priority Critical patent/EP2197624A1/en
Publication of EP2197624A1 publication Critical patent/EP2197624A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
    • B24B3/24—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of drills
    • B24B3/247—Supports for drills
    • 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
    • B24B41/061—Work supports, e.g. adjustable steadies axially supporting turning workpieces, e.g. magnetically, pneumatically
    • 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
    • B24B41/066—Work supports, e.g. adjustable steadies adapted for supporting work in the form of tools, e.g. drills
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T82/00—Turning
    • Y10T82/25—Lathe
    • Y10T82/2508—Lathe with tool turret

Definitions

  • the object of the present invention is to create an improved doll capable of being mounted on the base of a machining machine in which the workpiece holding device maintains the latter with the required precision, this doll being designed so as to master perfectly both degrees freedom without causing spurious effects that could affect the accuracy of machining.
  • the present invention relates to a precision guide device in a machine for machining cylindrical parts, comprising a doll mounted on a base and having a floating pin connected by an end to a motor driving it in rotation, and the other end to a collet capable of drastically clamping said parts, which are guided along a fixed axis in a guide system, characterized in that said floating spindle is arranged so that said parts are on the one hand rigidly coupled in rotation with the motor and on the other hand free to float radially with respect to said guide system.
  • said clamp is disposed within a composite spindle shaft forming part of the floating spindle.
  • the composite spindle shaft may be part of a spindle assembly comprising two elastically deformable portions each having a connecting member, these elements being rigidly fixed to each other.
  • One of said elastically deformable portions of the spindle assembly may comprise an input element coupled to a pulley linked to the motor and carried along a rigorously fixed axis relative to the base, the other elastically deformable portion of the assembly spindle may comprise a front output member to which is fixed a clamp holder holder supporting said clamp.
  • the drive pulley can be carried by a rolling bearing system on a fixed bushing integral with the base and in which the spindle assembly rotates freely.
  • Each of said deformable elastic portions of the spindle assembly may be formed of a perforated annular piece so as to have an axis of symmetry capable of angular deflection of small amplitude.
  • Each of said elastically deformable portions of the spindle assembly may comprise three distinct zones delimited by two pairs of profiled openings extending in an arc around the axis of the shaft and not leaving each other in each pair that two cruciform elements, respectively two thin sails located in the same diametral plane, each pair of cruciform elements, respectively of sails, connecting a first zone to a second or the second to the third in two diametrically opposite locations so as to allow the said radial flutters between said input and output elements of the spindle assembly.
  • One of said elastically deformable portions of the spindle assembly may be in the form of a disc whose outer region forms the input element rigidly coupled to the drive pulley, the other elastically deformable portion of the spindle.
  • spindle assembly in the form of an elongated spindle shaft, said zones of which are spaced along said shaft and whose opposite end to the connecting element forms the integral output member of the socket bushing -pince.
  • FIG. 1 is a perspective view of a floating pin doll forming part of the guide device
  • - fig. 2 is a vertical sectional view of the doll of FIG. 1, by the axis of the floating spindle,
  • FIG. 3A and 3B are perspective views of a perforated part forming part of the spindle.
  • FIG. 4 is a perspective view of the spindle shaft with perforated front portion.
  • a floating head doll 1 which comprises a base 2 intended to be mounted on a machine base, while being guided accurately along an axis X relative to this base.
  • a motor support generally designated by the numeral 3 and containing in a casing 4 a drive motor 5 (FIG 2) to numerical control.
  • This drive motor 5 is intended to rotate elongated cylindrical pieces, such as drills, for example, in a very hard material, and which must be erected or ground by wheels mounted and guided on the base of the machine. To achieve the required accuracy, it is essential that the workpieces be held in a part-taking device (not shown here) that guides them by setting four degrees of freedom, two rotations and two translations in space. The parts thus having a position and an orientation of their axis precisely determined, thanks to the part taking device, the drive motor 5 must control the rotation about the axis of the part, while the axial displacement of the doll 1 determines the last degree of freedom. In order for these two degrees of freedom to be controlled without parasitic forces resulting from misalignments between the guiding device and the drive mechanism, the doll 1 is equipped with a floating spindle generally designated 6 (FIG. said workpieces.
  • a floating spindle generally designated 6
  • the floating spindle 6 appears in FIG. 1 where we see the end of a clamp holder sleeve 7 containing and controlling a clamp 8 clamping the workpiece.
  • Fig. 2 shows the construction of the drive mechanism of the bushing 7.
  • the motor shaft 5 carries a driving pulley 9 which, by a toothed belt 10, drives a spindle pulley 11.
  • the pulley 11 is mounted on two ball bearings 12 whose inner rings are mounted on a socket base 13 rigidly secured to the base 2 by means of a ring fixed 14 and a spacer 15.
  • the spindle 6 comprises a spindle shaft 16 which connects the spindle pulley 1 1 to the clamp holder bushing 7.
  • the pulley 1 1 is integral with a outer circular portion of a pseudo-cardan disk 17 having a central portion fixed by screws 18 and a centering piece 19 against the rear face of the solid portion 20 of the spindle shaft 16.
  • the solid portion 20 of the spindle shaft 16 rotates freely in the socket base 13, while its front end 21, secured to the clamp holder sleeve 7, is guided in a fixed sleeve 22.
  • Between the two solid rear portions 20 and 21 before the spindle shaft 16 is provided with a deformable part 23 better represented in FIG. 4 and also acting as a pseudo-cardan, as the intermediate zone of the piece 17 (see Fig. 3 and 4).
  • the disk 17 and the deformable portion 23 of the spindle shaft 16 are elements that functionally play similar roles.
  • the pseudo-cardan disk 17 has an outer peripheral zone 24 provided with openings for screw fixing to the pulley 11, an intermediate zone 25 and an annular central zone 26 with openings (not shown) for the screws 18. Between these zones extend two pairs of openings shaped in an arc of a circle which leave between their ends in each pair only two cruciform elements 27, 27 'and 28, 28' arranged radially in planes containing the axis of 17 and perpendicular to each other. By these cruciform elements 27 and 28 are respectively interconnected the zones 24 and 25 and the zones 25 and 26 so that angular displacements of low amplitude around the axes i and ii are possible between the outer zone 24 and the central zone. 26.
  • FIG. 4 which represents the tubular portion of the spindle shaft 16, there is a rear solid zone 20 separated from a solid zone before 21 by the deformable portion 23, the latter limited by two pairs of narrow openings in slits which surround the axis of the shaft each substantially half of the turn of the tree and leave between their ends only the thin webs 29, 29 'and 30, 30' connecting each zone 20 or 21 to the intermediate zone 23.
  • the plans common to the sails 29 and the sails 30 are perpendicular to each other. Small angular displacements between zones along the axes k and kk are possible almost freely.
  • the gripper 8, and thus the workpiece which is retained in the spindle 6 by a conventional clamping device 31, is connected to the drive pulley 9 by means of two pseudo-gimbals, the cruciform elements 27, 28 and the sails 29 and 30, which allow misalignments of the piece both parallel and angular with respect to the drive pulley 9 and therefore relative to the base 2.
  • the part In the axial direction, however, the part is maintained rigidly, because the cruciform elements 27, 28 and the sails 29, 30 are not deformable in this direction.
  • the connection is rigid between the part fixed in the clamp 8 and the servomotor 5, which allows the angular control and its interpolation with the other numerical axes of the machine.
  • the clamp 8 and thus the part which is retained by its clamping system 31 is connected to the drive pulley via two pseudo-gimbals, the elements 27, 28 and 29, 30 , which allow misalignments of the part, both parallel and angular with respect to the drive pulley 1 1, and therefore with respect to the base 26.
  • the part is held rigidly because the elements 27, 28 and 29, 30 are not deformable in this direction.
  • the connection is rigid between the workpiece and the servomotor, allowing the angular control and its interpolation with the other numerical axes of the machine.
  • the device produced ensures no play and no wear compared to any device traditionally equipped with universal joints.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gripping On Spindles (AREA)
  • Turning (AREA)
  • Jigs For Machine Tools (AREA)

Abstract

According to the invention, the pin (6) is rotated by the motor (5) via the belt (10) and the pulley (11) that is precision-held on the fixed bushing (13). It comprises a pin arm (16) whose solid rear portion (20) rotates in the bushing (13) and is coupled by screws (18), and the centring part (19) at the inner area of the pseudo universal-joint disk (17) whose outer area is coupled to the pulley (11). A second pseudo universal-joint connection is provided between the rear portion (20) of the pin arm (16) and the front portion thereof (21), which is connected to the clamp-holding bushing (7) in which the clamping collet (8) is mounted.

Description

Dispositif de guidage de précision dans une machine d'usinage de pièces cylindriques Precision guide device in a machine for machining cylindrical workpieces
Domaine techniqueTechnical area
L'usinage de certains outils cylindriques en matériaux durs, comme des forets de petit diamètre, plus ou moins longs, doit répondre à des exigences de précision de plus en plus grandes.The machining of some cylindrical tools of hard materials, such as small diameter drills, more or less long, must meet increasingly demanding accuracy requirements.
Etat de la techniqueState of the art
Dans les machines usuelles, on trouve généralement un dispositif de prise de pièce réalisé par un vé fixe additionné d'un doigt de serrage. Ces dispositifs retirent quatre degrés de liberté au barreau à usiner : deux rotations et deux translations. Pour que le guidage soit exact et complet, il reste donc au dispositif d'entraînement à retirer les deux degrés de liberté restants, le déplacement axial et la rotation autour de l'axe de la pièce, ce dernier ne devant pas être annulé mais piloté numériquement pour permettre une interpolation avec les autres mouvements de la machine.In the usual machines, there is generally a part taking device made by a fixed vee added a clamping finger. These devices remove four degrees of freedom from the bar to be machined: two rotations and two translations. So that the guidance is exact and complete, it remains to the drive device to remove the two remaining degrees of freedom, the axial displacement and rotation around the axis of the part, the latter not to be canceled but piloted numerically to allow an interpolation with the other movements of the machine.
Le document US 4,971 ,339 divulgue l'agencement d'un dispositif de guidage qui évite la création d'effets parasites par les moyens d'entraînement sur le dispositif de prise de pièce, mais cet agencement connu ne garantit pas un asservissement rigoureux entre le moteur d'entraînement et la pince de serrage des pièces.Document US Pat. No. 4,971,339 discloses the arrangement of a guiding device which avoids the creation of spurious effects by the drive means on the part-taking device, but this known arrangement does not guarantee a strict servocontrol between the drive motor and chuck parts.
Divulgation de l'inventionDisclosure of the invention
Le but de la présente invention est de créer une poupée perfectionnée susceptible d'être montée sur le socle d'une machine d'usinage dans laquelle le dispositif de prise de pièce maintient ces dernières avec la précision requise, cette poupée étant conçue de manière à maîtriser parfaitement les deux degrés de liberté restants sans entraîner d'effets parasites susceptibles d'affecter la précision de l'usinage.The object of the present invention is to create an improved doll capable of being mounted on the base of a machining machine in which the workpiece holding device maintains the latter with the required precision, this doll being designed so as to master perfectly both degrees freedom without causing spurious effects that could affect the accuracy of machining.
Dans ce but, la présente invention a pour objet un dispositif de guidage de précision dans une machine d'usinage de pièces cylindriques, comportant une poupée montée sur un socle et comportant une broche flottante reliée, par une extrémité à un moteur l'entraînant en rotation, et par l'autre extrémité à une pince de serrage capable d'enserrer radicalement les dites pièces, celles-ci étant guidées selon un axe fixe dans un système de guidage, caractérisé en ce que la dite broche flottante est agencée de manière que les dites pièces soient d'une part rigidement accouplées en rotation avec le moteur et d'autre part libres de flotter radialement par rapport au dit système de guidage.For this purpose, the present invention relates to a precision guide device in a machine for machining cylindrical parts, comprising a doll mounted on a base and having a floating pin connected by an end to a motor driving it in rotation, and the other end to a collet capable of drastically clamping said parts, which are guided along a fixed axis in a guide system, characterized in that said floating spindle is arranged so that said parts are on the one hand rigidly coupled in rotation with the motor and on the other hand free to float radially with respect to said guide system.
Selon un mode d'exécution, la dite pince de serrage est disposée à l'intérieur d'un arbre de broche composite faisant partie de la broche flottante.According to one embodiment, said clamp is disposed within a composite spindle shaft forming part of the floating spindle.
L'arbre de broche composite peut faire partie d'un ensemble de broche comprenant deux parties élastiquement déformables ayant chacune un élément de liaison, ces éléments étant rigidement fixés l'un à l'autre.The composite spindle shaft may be part of a spindle assembly comprising two elastically deformable portions each having a connecting member, these elements being rigidly fixed to each other.
L'une des dites parties élastiquement déformables de l'ensemble de broche peut comporter un élément d'entrée accouplé à une poulie liée au moteur et portée selon un axe rigoureusement fixe par rapport au socle, l'autre partie élastiquement déformable de l'ensemble de broche pouvant comporter un élément de sortie avant auquel est fixée une douille porte-pince supportant la dite pince de serrage.One of said elastically deformable portions of the spindle assembly may comprise an input element coupled to a pulley linked to the motor and carried along a rigorously fixed axis relative to the base, the other elastically deformable portion of the assembly spindle may comprise a front output member to which is fixed a clamp holder holder supporting said clamp.
La poulie d'entraînement peut être portée par un système de paliers à roulement sur une douille fixe solidaire du socle et dans laquelle l'ensemble de broche tourne librement. Chacune des dites parties élastiques déformables de l'ensemble de broche peut être formée d'une pièce annulaire ajourée de manière à présenter un axe de symétrie susceptible d'un débattement angulaire de faible amplitude.The drive pulley can be carried by a rolling bearing system on a fixed bushing integral with the base and in which the spindle assembly rotates freely. Each of said deformable elastic portions of the spindle assembly may be formed of a perforated annular piece so as to have an axis of symmetry capable of angular deflection of small amplitude.
Les dites parties élastiquement déformables de l'ensemble de broche peuvent être fixées l'une à l'autre coaxialement par les dits éléments de liaison de telle manière que des flottements radiaux entre la pince de serrage et la poulie d'entraînement n'entraînent aucun effort parasite alors que le couple d'entraînement se transmet sans déformation et sans jeu.The said elastically deformable portions of the spindle assembly can be attached to each other coaxially by the said connecting elements in such a way that radial fluttering between the collet and the drive pulley does not cause any damage. stray force while the training torque is transmitted without deformation and without play.
Chacune des dites parties élastiquement déformables de l'ensemble de broche peut comporter trois zones distinctes délimitées par deux paires d'ouvertures profilées s'étendant en arc de cercle autour de l'axe de l'arbre et ne laissant subsister entre elles dans chaque paire que deux éléments cruciformes, respectivement deux voiles minces situés dans un même plan diamétral, chaque paire d'éléments cruciformes, respectivement de voiles, reliant une première zone à une deuxième ou la deuxième à la troisième en deux endroits diamétralement opposés de manière à permettre les dits flottements radiaux entre les dits éléments d'entrée et de sortie de l'ensemble de broche.Each of said elastically deformable portions of the spindle assembly may comprise three distinct zones delimited by two pairs of profiled openings extending in an arc around the axis of the shaft and not leaving each other in each pair that two cruciform elements, respectively two thin sails located in the same diametral plane, each pair of cruciform elements, respectively of sails, connecting a first zone to a second or the second to the third in two diametrically opposite locations so as to allow the said radial flutters between said input and output elements of the spindle assembly.
L'une des dites parties élastiquement déformables de l'ensemble de broche peut avoir la forme d'un disque dont la zone extérieure forme l'élément d'entrée rigidement accouplé à la poulie d'entraînement, l'autre partie élastiquement déformable de l'ensemble de broche pouvant avoir la forme d'un arbre de broche allongé, dont les dites zones sont espacées le long du dit arbre et dont l'extrémité opposée à l'élément de liaison forme l'élément de sortie solidaire de la douille porte-pince.One of said elastically deformable portions of the spindle assembly may be in the form of a disc whose outer region forms the input element rigidly coupled to the drive pulley, the other elastically deformable portion of the spindle. spindle assembly in the form of an elongated spindle shaft, said zones of which are spaced along said shaft and whose opposite end to the connecting element forms the integral output member of the socket bushing -pince.
Brève description des dessinsBrief description of the drawings
Une forme d'exécution de l'objet de l'invention est décrite ci-après à simple titre d'exemple en se référant au dessin annexé dans lequel : - A -One embodiment of the subject of the invention is described below by way of example only with reference to the appended drawing in which: - AT -
- la fig. 1 est une vue en perspective d'une poupée à broche flottante faisant partie du dispositif de guidage,- fig. 1 is a perspective view of a floating pin doll forming part of the guide device,
- la fig. 2 est une vue en coupe verticale de la poupée de la fig. 1 , par l'axe de la broche flottante,- fig. 2 is a vertical sectional view of the doll of FIG. 1, by the axis of the floating spindle,
- les fig. 3A et 3B sont des vues en perspective d'une pièce ajourée faisant partie de la broche, et- figs. 3A and 3B are perspective views of a perforated part forming part of the spindle, and
- la fig. 4 est une vue en perspective de l'arbre de broche avec partie antérieure ajourée.- fig. 4 is a perspective view of the spindle shaft with perforated front portion.
Description détaillée de modes d'exécution de l'inventionDetailed description of embodiments of the invention
On voit à la fig. 1 une poupée 1 à broche flottante qui comporte un socle 2 destiné à être monté sur une embase de machine, tout en étant guidé avec précision selon un axe X par rapport à cette embase. Sur le socle 2 est rigidement fixé un support de moteur désigné globalement par le chiffre 3 et contenant dans une enveloppe 4 un moteur d'entraînement 5 (fig. 2) à commande numérique.We see in fig. 1 a floating head doll 1 which comprises a base 2 intended to be mounted on a machine base, while being guided accurately along an axis X relative to this base. On the base 2 is rigidly fixed a motor support generally designated by the numeral 3 and containing in a casing 4 a drive motor 5 (FIG 2) to numerical control.
Ce moteur d'entraînement 5 est destiné à faire tourner des pièces allongées cylindriques, telles que des forets par exemple, en un matériau très dur, et qui doivent être dressées ou rectifiées par des meules montées et guidées sur l'embase de la machine. Pour atteindre la précision requise, il est essentiel que les pièces à usiner soient tenues dans un dispositif de prise de pièce (non représenté ici) qui les guide en fixant quatre degrés de liberté, soit deux rotations et deux translations dans l'espace. Les pièces ayant ainsi une position et une orientation de leur axe précisément déterminées, grâce au dispositif de prise de pièce, le moteur d'entraînement 5 doit commander la rotation autour de l'axe de la pièce, tandis que le déplacement axial de la poupée 1 détermine le dernier degré de liberté. Pour que ces deux degrés de liberté soient maîtrisés sans efforts parasites provenant de désalignements entre le dispositif de guidage et le mécanisme d'entraînement, la poupée 1 est équipée d'une broche flottante désignée de façon générale par 6 (fig. 2) et recevant lesdites pièces à usiner.This drive motor 5 is intended to rotate elongated cylindrical pieces, such as drills, for example, in a very hard material, and which must be erected or ground by wheels mounted and guided on the base of the machine. To achieve the required accuracy, it is essential that the workpieces be held in a part-taking device (not shown here) that guides them by setting four degrees of freedom, two rotations and two translations in space. The parts thus having a position and an orientation of their axis precisely determined, thanks to the part taking device, the drive motor 5 must control the rotation about the axis of the part, while the axial displacement of the doll 1 determines the last degree of freedom. In order for these two degrees of freedom to be controlled without parasitic forces resulting from misalignments between the guiding device and the drive mechanism, the doll 1 is equipped with a floating spindle generally designated 6 (FIG. said workpieces.
La broche flottante 6 apparaît à la fig. 1 où on voit l'extrémité d'une douille porte- pince 7 contenant et commandant une pince 8 de serrage de la pièce à usiner.The floating spindle 6 appears in FIG. 1 where we see the end of a clamp holder sleeve 7 containing and controlling a clamp 8 clamping the workpiece.
La fig. 2 montre la construction du mécanisme d'entraînement de la douille 7. L'arbre du moteur 5 porte une poulie d'entraînement 9 qui, par une courroie crantée 10, entraîne une poulie de broche 11. Afin d'éviter de transmettre les efforts de traction de la courroie crantée sur l'arbre de broche 6, la poulie 11 est montée sur deux roulements à billes 12 dont les bagues intérieures sont montées sur une douille de socle 13 rigidement solidarisée au socle 2 par l'intermédiaire d'une bague fixe 14 et d'une pièce intercalaire 15.Fig. 2 shows the construction of the drive mechanism of the bushing 7. The motor shaft 5 carries a driving pulley 9 which, by a toothed belt 10, drives a spindle pulley 11. In order to avoid transmitting the forces traction of the toothed belt on the spindle shaft 6, the pulley 11 is mounted on two ball bearings 12 whose inner rings are mounted on a socket base 13 rigidly secured to the base 2 by means of a ring fixed 14 and a spacer 15.
Avec ce montage, les efforts radiaux ne sont pas transmis à l'arbre, et seul le couple d'entraînement lui est fourni.With this arrangement, the radial forces are not transmitted to the shaft, and only the drive torque is provided.
Pour assurer la transmission des mouvements et des efforts dans les conditions indiquées plus haut, la broche 6 comporte un arbre de broche 16 qui relie la poulie de broche 1 1 à la douille porte-pince 7. La poulie 1 1 est solidaire d'une partie circulaire extérieure d'un disque pseudo-cardan 17 ayant une partie centrale fixée, par des vis 18 et une pièce de centrage 19, contre la face arrière de la partie massive 20 de l'arbre de broche 16. La partie massive 20 de l'arbre de broche 16 tourne librement dans la douille de socle 13, tandis que son extrémité avant 21 , solidarisée à la douille porte-pince 7, est guidée dans une douille fixe 22. Entre les deux parties massives arrière 20 et avant 21 de l'arbre de broche 16 est ménagée une partie déformable 23 mieux représentée à la fig. 4 et jouant aussi un rôle de pseudo-cardan, comme la zone intermédiaire de la pièce 17 (voir fig. 3 et 4). Bien que conformés différemment, le disque 17 et la partie déformable 23 de l'arbre de broche 16 sont des éléments qui jouent fonctionnellement des rôles semblables.To ensure the transmission of movements and forces under the conditions indicated above, the spindle 6 comprises a spindle shaft 16 which connects the spindle pulley 1 1 to the clamp holder bushing 7. The pulley 1 1 is integral with a outer circular portion of a pseudo-cardan disk 17 having a central portion fixed by screws 18 and a centering piece 19 against the rear face of the solid portion 20 of the spindle shaft 16. The solid portion 20 of the spindle shaft 16 rotates freely in the socket base 13, while its front end 21, secured to the clamp holder sleeve 7, is guided in a fixed sleeve 22. Between the two solid rear portions 20 and 21 before the spindle shaft 16 is provided with a deformable part 23 better represented in FIG. 4 and also acting as a pseudo-cardan, as the intermediate zone of the piece 17 (see Fig. 3 and 4). Although shaped differently, the disk 17 and the deformable portion 23 of the spindle shaft 16 are elements that functionally play similar roles.
A la fig. 3, le disque pseudo-cardan 17 comporte une zone périphérique extérieure 24 pourvue d'ouvertures pour la fixation par vis à la poulie 1 1 , une zone intermédiaire 25 et une zone centrale annulaire 26 avec des ouvertures (non représentées) pour les vis 18. Entre ces zones s'étendent deux paires d'ouvertures profilées en arc de cercle qui ne laissent subsister entre leurs extrémités dans chaque paire que deux éléments cruciformes 27, 27' et 28, 28' disposés radialement selon des plans contenant l'axe de la pièce 17 et perpendiculaires l'un à l'autre. Par ces éléments cruciformes 27 et 28 sont reliées entre elles respectivement les zones 24 et 25 et les zones 25 et 26 de telle manière que des déplacements angulaires de faible amplitude autour des axes i et ii sont possibles entre la zone extérieure 24 et la zone centrale 26.In fig. 3, the pseudo-cardan disk 17 has an outer peripheral zone 24 provided with openings for screw fixing to the pulley 11, an intermediate zone 25 and an annular central zone 26 with openings (not shown) for the screws 18. Between these zones extend two pairs of openings shaped in an arc of a circle which leave between their ends in each pair only two cruciform elements 27, 27 'and 28, 28' arranged radially in planes containing the axis of 17 and perpendicular to each other. By these cruciform elements 27 and 28 are respectively interconnected the zones 24 and 25 and the zones 25 and 26 so that angular displacements of low amplitude around the axes i and ii are possible between the outer zone 24 and the central zone. 26.
Selon la fig. 4, finalement, qui représente la partie tubulaire de l'arbre de broche 16, on distingue une zone massive arrière 20 séparée d'une zone massive avant 21 par la partie déformable 23, celle-ci limitée par deux paires d'ouvertures étroites en forme de fentes qui entourent l'axe de l'arbre chacune pratiquement sur la moitié du tour de l'arbre et ne laissent subsister entre leurs extrémités que les voiles minces 29, 29' et 30, 30' reliant chaque zone 20 ou 21 à la zone intermédiaire 23. Ici aussi, les plans communs aux voiles 29 et aux voiles 30 sont perpendiculaires l'un à l'autre. De petits déplacements angulaires entre zones selon les axes k et kk sont possibles quasi librement.According to FIG. 4, finally, which represents the tubular portion of the spindle shaft 16, there is a rear solid zone 20 separated from a solid zone before 21 by the deformable portion 23, the latter limited by two pairs of narrow openings in slits which surround the axis of the shaft each substantially half of the turn of the tree and leave between their ends only the thin webs 29, 29 'and 30, 30' connecting each zone 20 or 21 to the intermediate zone 23. Here again, the plans common to the sails 29 and the sails 30 are perpendicular to each other. Small angular displacements between zones along the axes k and kk are possible almost freely.
La pince 8, et donc la pièce à usiner qui est retenue dans la broche 6 par un dispositif de serrage classique 31 , se trouve reliée à la poulie d'entraînement 9 par l'intermédiaire de deux pseudo-cardans, les éléments cruciformes 27, 28 et les voiles 29 et 30, qui autorisent des désalignements de la pièce tant parallèles qu'angulaires par rapport à la poulie d'entraînement 9 et donc par rapport à la base 2. Dans le sens axial, par contre, la pièce est maintenue rigidement, car les éléments cruciformes 27, 28 et les voiles 29, 30 ne sont pas déformables dans cette direction. De même, en rotation, la liaison est rigide entre la pièce fixée dans la pince 8 et le servo-moteur 5, ce qui permet le contrôle angulaire et son interpolation avec les autres axes numériques de la machine.The gripper 8, and thus the workpiece which is retained in the spindle 6 by a conventional clamping device 31, is connected to the drive pulley 9 by means of two pseudo-gimbals, the cruciform elements 27, 28 and the sails 29 and 30, which allow misalignments of the piece both parallel and angular with respect to the drive pulley 9 and therefore relative to the base 2. In the axial direction, however, the part is maintained rigidly, because the cruciform elements 27, 28 and the sails 29, 30 are not deformable in this direction. Similarly, in rotation, the connection is rigid between the part fixed in the clamp 8 and the servomotor 5, which allows the angular control and its interpolation with the other numerical axes of the machine.
II en résulte que la pince 8, et donc la pièce qui est retenue par son système de serrage 31 , se trouve reliée à la poulie d'entraînement par l'intermédiaire de deux pseudo-cardans, les éléments 27, 28 et 29, 30, lesquels autorisent des désalignements de la pièce, tant parallèles qu'angulaires par rapport à la poulie d'entraînement 1 1 , et donc par rapport à la base 26. Axialement, par contre, la pièce est maintenue rigidement car les éléments 27, 28 et 29, 30 ne sont pas déformables dans cette direction. De même en rotation, la liaison est rigide entre la pièce et le servomoteur, permettant le contrôle angulaire et son interpolation avec les autres axes numériques de la machine.As a result, the clamp 8, and thus the part which is retained by its clamping system 31, is connected to the drive pulley via two pseudo-gimbals, the elements 27, 28 and 29, 30 , which allow misalignments of the part, both parallel and angular with respect to the drive pulley 1 1, and therefore with respect to the base 26. Axially, however, the part is held rigidly because the elements 27, 28 and 29, 30 are not deformable in this direction. Similarly in rotation, the connection is rigid between the workpiece and the servomotor, allowing the angular control and its interpolation with the other numerical axes of the machine.
II en résulte que le dispositif réalisé garantit une absence de jeu et une absence d'usure par rapport à tout dispositif traditionnellement muni de cardans. As a result, the device produced ensures no play and no wear compared to any device traditionally equipped with universal joints.

Claims

Revendications claims
1. Dispositif de guidage de précision dans une machine d'usinage de pièces cylindriques, comportant une poupée (1 ) montée sur un socle (2) et comportant une broche flottante (6) reliée, par une extrémité à un moteur (5) l'entraînant en rotation, et par l'autre extrémité à une pince de serrage (8) capable d'enserrer radicalement les dites pièces, celles-ci étant guidées selon un axe fixe dans un système de guidage, caractérisé en ce que la dite broche flottante (6) est agencée de manière que les dites pièces soient d'une part rigidement accouplées en rotation avec le moteur (5) et d'autre part libres de flotter radialement par rapport au dit système de guidage.1. Precision guide device in a machine for machining cylindrical parts, comprising a headstock (1) mounted on a base (2) and having a floating spindle (6) connected at one end to a motor (5). driving in rotation, and at the other end to a collet (8) capable of radically clamping said pieces, the latter being guided along a fixed axis in a guiding system, characterized in that the said spindle floating (6) is arranged so that said parts are on the one hand rigidly coupled in rotation with the motor (5) and on the other hand free to float radially relative to said guide system.
2. Dispositif selon la revendication 1 , caractérisé en ce que la dite pince de serrage (8) est disposée à l'intérieur d'un arbre de broche composite (16) faisant partie de la broche flottante (6).2. Device according to claim 1, characterized in that said clamp (8) is disposed within a composite spindle shaft (16) forming part of the floating spindle (6).
3. Dispositif selon la revendication 2, caractérisé en ce que l'arbre de broche composite (16) fait partie d'un ensemble de broche (16, 17, 18, 19) comprenant deux parties (17, 16) élastiquement déformables ayant chacune un élément de liaison (26, 20), ces éléments étant rigidement fixés l'un à l'autre.3. Device according to claim 2, characterized in that the composite spindle shaft (16) is part of a spindle assembly (16, 17, 18, 19) comprising two resiliently deformable portions (17, 16) each having a connecting element (26, 20), these elements being rigidly fixed to one another.
4. Dispositif selon la revendication 3, caractérisé en ce que l'une des dites parties élastiquement déformables (17) de l'ensemble de broche comporte un élément d'entrée (24) accouplé à une poulie (11 ) liée au moteur (5) et portée selon un axe rigoureusement fixe par rapport au socle (2), et en ce que l'autre partie élastiquement déformable (16) de l'ensemble de broche comporte un élément de sortie avant (21 ) auquel est fixée une douille porte-pince (7) supportant la dite pince de serrage (8).4. Device according to claim 3, characterized in that one of said elastically deformable portions (17) of the spindle assembly comprises an input member (24) coupled to a pulley (11) connected to the motor (5). ) and carried along a strictly fixed axis relative to the base (2), and in that the other resiliently deformable portion (16) of the spindle assembly comprises a front output member (21) to which is attached a bushing clamp (7) supporting said clamp (8).
5. Dispositif selon la revendication 4, caractérisé en ce que la poulie d'entraînement (1 1 ) est portée par un système de paliers à roulement (12) sur une douille fixe (13) solidaire du socle (2) et dans laquelle l'ensemble de broche (16, 17, 18, 19) tourne librement. 5. Device according to claim 4, characterized in that the drive pulley (1 1) is carried by a rolling bearing system (12) on a fixed sleeve (13) integral with the base (2) and in which the spindle assembly (16, 17, 18, 19) rotates freely.
6. Dispositif selon la revendication 4, caractérisé en ce que chacune des dites parties élastiques déformables (16, 17) de l'ensemble de broche est formée d'une pièce annulaire ajourée de manière à présenter un axe de symétrie susceptible d'un débattement angulaire de faible amplitude.6. Device according to claim 4, characterized in that each of said deformable elastic portions (16, 17) of the spindle assembly is formed of a perforated annular piece so as to have an axis of symmetry capable of a deflection angular low amplitude.
7. Dispositif selon la revendication 6, caractérisé en ce que les dites parties élastiquement déformables (16, 17) de l'ensemble de broche sont fixées l'une à l'autre coaxialement par les dits éléments de liaison (26, 20) de telle manière que des flottements radiaux entre la pince de serrage (8) et la poulie d'entraînement (1 1 ) n'entraînent aucun effort parasite alors que le couple d'entraînement se transmet sans déformation et sans jeu.7. Device according to claim 6, characterized in that said elastically deformable portions (16, 17) of the spindle assembly are fixed to each other coaxially by said connecting elements (26, 20) of such that radial flutter between the collet (8) and the drive pulley (1 1) causes no parasitic effort while the drive torque is transmitted without deformation and play.
8. Dispositif selon la revendication 7, caractérisé en ce que chacune des dites parties élastiquement déformables (16, 17) de l'ensemble de broche comporte trois zones distinctes (24, 25, 26; 20, 23, 21 ) délimitées par deux paires d'ouvertures profilées s'étendant en arc de cercle autour de l'axe de l'arbre et ne laissant subsister entre elles dans chaque paire que deux éléments cruciformes, respectivement deux voiles minces (27, 27', 28, 28'; 29, 29', 30, 30') situés dans un même plan diamétral, chaque paire d'éléments cruciformes, respectivement de voiles, reliant une première zone à une deuxième (24, 25; 20, 23) ou la deuxième à la troisième (25, 26; 23, 21 ) en deux endroits diamétralement opposés de manière à permettre les dits flottements radiaux entre les dits éléments d'entrée et de sortie de l'ensemble de broche.8. Device according to claim 7, characterized in that each of said elastically deformable portions (16, 17) of the spindle assembly comprises three distinct zones (24, 25, 26; 20, 23, 21) delimited by two pairs shaped openings extending in an arc around the axis of the shaft and leaving between each pair only two cruciform elements, respectively two thin webs (27, 27 ', 28, 28'; , 29 ', 30, 30') located in the same diametral plane, each pair of cruciform elements, respectively of webs, connecting a first zone to a second (24, 25; 20, 23) or the second to the third zone ( 25, 26, 23, 21) at two diametrically opposed locations so as to allow said radial floats between said input and output elements of the spindle assembly.
9. Dispositif selon la revendication 8, caractérisé en ce que l'une des dites parties élastiquement déformables (17) de l'ensemble de broche a la forme d'un disque dont la zone extérieure forme l'élément d'entrée rigidement accouplé à la poulie d'entraînement (1 1 ), et en ce que l'autre partie élastiquement déformable (16) de l'ensemble de broche a la forme d'un arbre de broche allongé, dont les dites zones sont espacées le long du dit arbre et dont l'extrémité opposée à l'élément de liaison forme l'élément de sortie (21 ) solidaire de la douille (7) porte- pince. 9. Device according to claim 8, characterized in that one of said elastically deformable portions (17) of the spindle assembly has the shape of a disk whose outer region forms the input element rigidly coupled to the drive pulley (1 1), and in that the other resiliently deformable portion (16) of the spindle assembly is in the form of an elongated spindle shaft, the said zones of which are spaced along the said shaft and whose end opposite the connecting element forms the output member (21) integral with the sleeve (7) clamp holder.
EP08807473A 2007-08-31 2008-08-28 Precision guiding device in a machine for machining cylindrical parts Withdrawn EP2197624A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08807473A EP2197624A1 (en) 2007-08-31 2008-08-28 Precision guiding device in a machine for machining cylindrical parts

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP07115418A EP2030720A1 (en) 2007-08-31 2007-08-31 Precision guiding device in a machine for machining cylindrical pieces
PCT/IB2008/053476 WO2009027940A1 (en) 2007-08-31 2008-08-28 Precision guiding device in a machine for machining cylindrical parts
EP08807473A EP2197624A1 (en) 2007-08-31 2008-08-28 Precision guiding device in a machine for machining cylindrical parts

Publications (1)

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EP2197624A1 true EP2197624A1 (en) 2010-06-23

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EP08807473A Withdrawn EP2197624A1 (en) 2007-08-31 2008-08-28 Precision guiding device in a machine for machining cylindrical parts

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US (1) US20100170371A1 (en)
EP (2) EP2030720A1 (en)
JP (1) JP2010537834A (en)
CN (1) CN101790435A (en)
TW (1) TW200924902A (en)
WO (1) WO2009027940A1 (en)

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EP2962361A1 (en) 2013-03-01 2016-01-06 UMC Utrecht Holding B.V. Dipole antenna for a magnetic resonance imaging system
CN103252648B (en) * 2013-05-16 2015-06-10 新昌县讯为自动化设备有限公司 Special drilling and reaming equipment for distributor of air conditioning system
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US20100170371A1 (en) 2010-07-08
EP2030720A1 (en) 2009-03-04
JP2010537834A (en) 2010-12-09
TW200924902A (en) 2009-06-16
WO2009027940A1 (en) 2009-03-05
CN101790435A (en) 2010-07-28

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