EP0640435B1 - Grinding machine - Google Patents

Grinding machine Download PDF

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Publication number
EP0640435B1
EP0640435B1 EP94112956A EP94112956A EP0640435B1 EP 0640435 B1 EP0640435 B1 EP 0640435B1 EP 94112956 A EP94112956 A EP 94112956A EP 94112956 A EP94112956 A EP 94112956A EP 0640435 B1 EP0640435 B1 EP 0640435B1
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EP
European Patent Office
Prior art keywords
axis
grinder
machine according
slider
machined
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EP94112956A
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German (de)
French (fr)
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EP0640435A1 (en
Inventor
Michel Rollier
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Rollomatic SA
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Rollomatic SA
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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
    • B24B27/00—Other grinding machines or devices
    • B24B27/0076—Other grinding machines or devices grinding machines comprising two or more grinding tools
    • 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
    • B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
    • 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
    • B24B41/065—Steady rests

Definitions

  • the present invention relates to a grinding machine for the machining of revolutionary parts, in particular in hard materials such as carbides, high-speed steels etc. It relates to more particularly a machine for grinding small diameter parts over a long length.
  • the workpiece is fixed in a workpiece spindle to be driven in rotation about its axis of revolution, the spindle making part of a doll which is integral with the frame of the machine.
  • a movable slide comprising a wheel.
  • the slide can be moved, usually at by means of a digital control device, along an axis longitudinal and a transverse axis, oriented respectively parallel and perpendicular to the axis of revolution of the workpiece and which is also the axis of rotation of the brooch.
  • both slides can be programmed so the part has a profile of predetermined shape.
  • Such machines allow machining in good part conditions including the length to diameter ratio, ratio which will be designated subsequently by K, does not exceed around 10.
  • a machine according to the preamble of claim 1 is known, for example from CH-A-381554.
  • the fig. 1 shows the main components of such a machine Profile view.
  • the workpiece 1 rests on a support 2, while being enclosed by a roller 3 and by a grinding wheel 4.
  • roller 3 the surface of which has a high coefficient of friction, rotates in opposite direction that of grinding wheel 4, this direction being chosen so that the roller and grinding wheel apply part 1 to support 2.
  • the roller rotates the part 1 and makes possible its machining by the grinding wheel.
  • These machines allow the machining of cylindrical parts of approximately one millimeter in diameter at least over a length of a few centimeters, length equal to the width of the wheel. The corresponding K ratio can thus reach at best 100.
  • the present invention proposes to provide a grind with significantly more machining possibilities areas, especially with respect to the K report, that the cumulative possibilities of existing machines.
  • the grinding machine according to the invention for machining parts of revolution includes the features contained in claim 1.
  • reference 10 designates a doll which has a workpiece pin 11 used to fix, for example by means of a mandrel 12, the workpiece 1, the shape of which is that of a body of revolution.
  • Spindle 11 rotates the part 1 around its axis of revolution aa 'in order to allow its machining, as it is shown in more detail in fig. 5.
  • the doll 10 is arranged on the frame, not shown, of the grinding machine. Whereas in conventional machines the headstock is rigidly fixed to the frame, in the present realization the headstock 10 is movable in translation on the frame along a longitudinal axis X parallel to the axis aa '. In this effect the doll is arranged on slides or rails 13 of the frame, the translational movement being obtained by means of a motor 14 integral with the frame and a transmission member 15, for example a lead screw arranged between the engine and the doll.
  • Part of the workpiece 1 leaving the mandrel 12 takes support against a support 16, rigidly fixed on the frame of the machine.
  • the support 16 which will be described in detail below, used to hold this part of part 1 in a position well defined in relation to the frame, while allowing it to rotate around the axis aa '.
  • a slide 17 which supports a grinding wheel 18 intended to machine the part 1.
  • the slide is movable in translation on the frame along an axis transverse Y, as in conventional machines, its displacement being obtained either manually or using a motor not shown.
  • the Y axis and the axis of rotation of the grinding wheel 18 are oriented respectively perpendicular and parallel to the X axis, but different orientations of these axes could also suit.
  • the slide 17 can still be moved, for example manually, in the direction of the X axis.
  • the operation of the grinding machine shown in the fig. 2 is as follows.
  • the workpiece 1 once fixed in the spindle 11, the doll 10 is arranged on the slides 13 in a place allowing it to move towards the support 16 at a distance at least equal to the length in front to be ground.
  • the end free of part 1 must be engaged in support 16 without exceed it.
  • the slide 17 is then moved along the axis X so as to bring the grinding wheel 18 as close as possible to the support 16, without touching it, then along the Y axis to place the grinding wheel at a distance from the axis aa 'equal to radius that the finished part must have.
  • the translation of the doll 10 to support 16 can start.
  • the end of the part 1 then comes into contact with the grinding wheel 18 so that this brings by abrasion its diameter to the desired value.
  • the grinding wheel 18 being placed in the immediate vicinity of the support 16, the part of part 1 which is subjected to the action of the tool has a very small overhang. Bending of the part is in these conditions negligible, which guarantees a high machining precision over a length in principle arbitrary, equal to the displacement of the doll.
  • the diameter of the piece 1 is small, and its length important, its machined end must be guided, introducing it for example into a tube not shown.
  • the signal from command S acts, via electrical connections not shown, on the engine 14, and on the engine of the slide 17 which drives it parallel to the Y axis.
  • the control unit 20 controls this unit for that the part 1 is machined so that its diameter varies, at less over part of its length, according to a law predetermined.
  • An example of a part thus machined is shown in fig. 5.
  • the machine has a another grinding wheel 21, which can be arranged on another slide 22.
  • This slide is movable according to X and Y axes, the displacement along the Y axis being preferably obtained by means of a motor not shown receiving the control signal S.
  • the grinding wheel 18 can be a roughing wheel, and wheel 21 a finishing wheel. This last wheel must be placed at a distance a little larger of the support 16 than the grinding wheel 18, and the program of the control unit 20 take this offset into account.
  • the use of two grinding wheels increases the speed machining and improve the condition of the machined surface.
  • Support 16 an embodiment of which is shown in fig. 3a and 3b, is an essential part of the machine to be ground according to the invention.
  • Reference 25 designates on these figures a support foot rigidly fixed on the frame of the machine, this foot being shown profitably in FIG. 3a and in plan on fig. 3b.
  • the free part of the foot has a notch 26, V-shaped, in which the part is arranged to be machined 1.
  • the notch is delimited by a face 27 which comprises, in the present case, two plane faces 28 and 29, parallel to the axis of revolution aa 'and forming between them a angle of about 90 degrees.
  • the face 27 serves as a support for the part 1, the shape of which, before being machined, is that of a cylinder circular section.
  • the flat faces 28 and 29 are advantageously constituted by plates made of hard material.
  • Workpiece 1 is also firmly held in the notch 26 by a pressure roller 30.
  • This roller is movable in rotation about an axis parallel to axis aa ', and it exerts a sufficient force, typically of 50 kg, on piece 1 to prevent it from moving radially while allowing it to rotate.
  • the support 16 is arranged on the machine frame so that the line joining the center of the roller 30 to that of the piece 1 is a perpendicular straight line passing through the line defined by the intersection of the planar faces 28 and 29 of notch 26.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)

Description

La présente invention concerne une machine à meuler pour l'usinage de pièces de révolution, notamment en matériaux durs tels que les carbures, les aciers rapides etc. Elle concerne plus particulièrement une machine permettant de meuler des pièces de faible diamètre sur une longueur importante.The present invention relates to a grinding machine for the machining of revolutionary parts, in particular in hard materials such as carbides, high-speed steels etc. It relates to more particularly a machine for grinding small diameter parts over a long length.

Dans les machines à meuler conventionnelles, la pièce à usiner est fixée dans une broche porte-pièce pour être entraínée en rotation autour de son axe de révolution, la broche faisant partie d'une poupée qui est solidaire du bâti de la machine. Sur le bâti est encore disposée une coulisse mobile comportant une meule. La coulisse peut être déplacée, généralement au moyen d'un dispositif de commande numérique, suivant un axe longitudinal et un axe transversal, orientés respectivement parallèlement et perpendiculairement à l'axe de révolution de la pièce à usiner et qui est aussi l'axe de rotation de la broche. Le déplacement de la coulisse suivant l'axe transversal permet d'amener la meule, dont l'axe de rotation est habituellement parallèle à celui de la broche, en contact de la pièce à usiner pour réduire son diamètre à la valeur désirée sur une longueur correspondant au déplacement longitudinal de cette coulisse. Bien entendu les deux déplacements de la coulisse peuvent être programmés de manière que la pièce présente un profil de forme prédéterminée.In conventional grinding machines, the workpiece is fixed in a workpiece spindle to be driven in rotation about its axis of revolution, the spindle making part of a doll which is integral with the frame of the machine. On the frame is still arranged a movable slide comprising a wheel. The slide can be moved, usually at by means of a digital control device, along an axis longitudinal and a transverse axis, oriented respectively parallel and perpendicular to the axis of revolution of the workpiece and which is also the axis of rotation of the brooch. The displacement of the slide along the axis transverse allows to bring the grinding wheel, whose axis of rotation is usually parallel to that of the spindle, in contact of the workpiece to reduce its diameter to the value desired over a length corresponding to the displacement longitudinal of this slide. Of course both slides can be programmed so the part has a profile of predetermined shape.

De telles machines permettent d'usiner dans de bonnes conditions des pièces dont le rapport longueur sur diamètre, rapport qui sera désigné par la suite par K, ne dépasse pas environ 10.Such machines allow machining in good part conditions including the length to diameter ratio, ratio which will be designated subsequently by K, does not exceed around 10.

Une machine selon le préambule de la revendication 1 est connue, par exemple de CH-A-381554.A machine according to the preamble of claim 1 is known, for example from CH-A-381554.

Le meulage de pièces présentant un rapport K supérieur à 10 est possible, mais au moyen de machines dites "centerless". La fig. 1 représente les principaux organes d'une telle machine vue de profil. La pièce à usiner 1 repose sur un support 2, tout en étant enserrée par un rouleau 3 et par une meule 4. Bien entendu la pièce comporte un centre, mais la position du centre n'est pas fixe puiqu'elle dépend du diamètre de la pièce, cette particularité justifiant le nom donné à ce type de machines. Le rouleau 3, dont la surface présente un coefficient de frottement élevé, tourne en sens inverse de celui de la meule 4, ce sens étant choisi de manière que le rouleau et la meule appliquent la pièce 1 sur le support 2. Grinding of parts with a K ratio greater than 10 is possible, but using so-called "centerless" machines. The fig. 1 shows the main components of such a machine Profile view. The workpiece 1 rests on a support 2, while being enclosed by a roller 3 and by a grinding wheel 4. Of course the piece has a center, but the position of the center is not fixed since it depends on the diameter of the piece, this particularity justifying the name given to this type of machines. Roller 3, the surface of which has a high coefficient of friction, rotates in opposite direction that of grinding wheel 4, this direction being chosen so that the roller and grinding wheel apply part 1 to support 2.

Dans ces conditions, le rouleau entraíne en rotation la pièce 1 et rend possible son usinage par la meule. Ces machines permettent d'usiner des pièces cylindriques d'environ un millimètre de diamètre au minimum sur une longueur de quelques centimètres, longueur égale à la largeur de la meule. Le rapport K correspondant peut ainsi atteindre au mieux 100.Under these conditions, the roller rotates the part 1 and makes possible its machining by the grinding wheel. These machines allow the machining of cylindrical parts of approximately one millimeter in diameter at least over a length of a few centimeters, length equal to the width of the wheel. The corresponding K ratio can thus reach at best 100.

La présente invention se propose de fournir une machine à meuler ayant des possibilités d'usinage nettement plus étendues, en particulier en ce qui concerne le rapport K, que les possibilités cumulées des machines existantes.The present invention proposes to provide a grind with significantly more machining possibilities areas, especially with respect to the K report, that the cumulative possibilities of existing machines.

Pour atteindre cet objectif, la machine à meuler selon l'invention pour usinage de pièces de révolution comprend les caracteristiques contennes dans la revendication 1.To achieve this objective, the grinding machine according to the invention for machining parts of revolution includes the features contained in claim 1.

D'autres caractéristiques et avantages de la machine à meuler ressortiront de la description qui va suivre, faite en regard du dessin annexé et donnant, à titre explicatif mais nullement limitatif, un exemple de réalisation d'une machine selon l'invention. Sur ce dessin, où les mêmes références se rapportent à des éléments analogues :

  • la fig. 1, déja citée, est une vue schématique montrant de profil une machine à meuler dite "centerless";
  • la fig. 2 montre, dans une vue en plan, les principaux organes d'une machine à meuler selon un mode de réalisation de l'invention;
  • la fig. 3 montre un mode de réalisation du support servant d'appui à la pièce à usiner;
  • la fig. 4 est une vue en bout montrant une disposition possible d'une meule d'ébauchage et d'une meule de finition par rapport à la pièce à usiner; et
  • la fig. 5 est une vue en plan montrant la disposition des meules par rapport à la pièce à usiner représentée sur la fig. 4, et un exemple de pièce meulée obtenue par la machine selon l'invention.
Other characteristics and advantages of the grinding machine will emerge from the description which follows, made with reference to the appended drawing and giving, by way of explanation but in no way limiting, an exemplary embodiment of a machine according to the invention. In this drawing, where the same references relate to similar elements:
  • fig. 1, already cited, is a schematic view showing in profile a grinding machine called "centerless";
  • fig. 2 shows, in a plan view, the main members of a grinding machine according to an embodiment of the invention;
  • fig. 3 shows an embodiment of the support serving as support for the workpiece;
  • fig. 4 is an end view showing a possible arrangement of a roughing wheel and a finishing wheel relative to the workpiece; and
  • fig. 5 is a plan view showing the arrangement of the grinding wheels relative to the workpiece shown in FIG. 4, and an example of a ground piece obtained by the machine according to the invention.

Sur la fig. 2, représentant un mode de réalisation de la machine à meuler selon l'invention, la référence 10 désigne une poupée qui comporte une broche porte-pièce 11 servant à fixer, par exemple au moyen d'un mandrin 12, la pièce à usiner 1 dont la forme est celle d'un corps de révolution. La broche 11 entraíne en rotation la pièce 1 autour de son axe de révolution aa' afin de permettre son usinage, comme cela est montré plus en détail sur la fig. 5.In fig. 2, representing an embodiment of the grinding machine according to the invention, reference 10 designates a doll which has a workpiece pin 11 used to fix, for example by means of a mandrel 12, the workpiece 1, the shape of which is that of a body of revolution. Spindle 11 rotates the part 1 around its axis of revolution aa 'in order to allow its machining, as it is shown in more detail in fig. 5.

La poupée 10 est disposée sur le bâti non représenté de la machine à meuler. Alors que dans les machines conventionnelles la poupée est fixée rigidement sur le bâti, dans la présente réalisation la poupée 10 est mobile en translation sur le bâti suivant un axe longitudinal X parallèle à l'axe aa'. A cet effet la poupée est disposée sur des glissières ou rails 13 du bâti, le mouvement de translation étant obtenu au moyen d'un moteur 14 solidaire du bâti et d'un organe de transmission 15, par exemple une vis mère disposée entre le moteur et la poupée.The doll 10 is arranged on the frame, not shown, of the grinding machine. Whereas in conventional machines the headstock is rigidly fixed to the frame, in the present realization the headstock 10 is movable in translation on the frame along a longitudinal axis X parallel to the axis aa '. In this effect the doll is arranged on slides or rails 13 of the frame, the translational movement being obtained by means of a motor 14 integral with the frame and a transmission member 15, for example a lead screw arranged between the engine and the doll.

Une partie de la pièce à usiner 1 sortant du mandrin 12 prend appui contre un support 16, fixé rigidement sur le bâti de la machine. Le support 16, qui sera décrit en détail plus loin, sert à maintenir cette partie de la pièce 1 dans une position bien définie par rapport au bâti, tout en lui permettant de pivoter autour de l'axe aa'.Part of the workpiece 1 leaving the mandrel 12 takes support against a support 16, rigidly fixed on the frame of the machine. The support 16, which will be described in detail below, used to hold this part of part 1 in a position well defined in relation to the frame, while allowing it to rotate around the axis aa '.

Sur le bâti de la machine est encore disposée une coulisse 17 qui supporte une meule 18 destinée à usiner la pièce 1. La coulisse est mobile en translation sur le bâti suivant un axe transversal Y, comme dans les machines conventionnelles, son déplacement étant obtenu soit manuellement, soit à l'aide d'un moteur non représenté. Dans le cas de la fig. 2, l'axe Y et l'axe de rotation de la meule 18 sont orientés respectivement perpendiculairement et parallèlement à l'axe X, mais des orientations différentes de ces axes pourraient aussi convenir. Pour placer la meule 18 dans la position permettant d'usiner la pièce 1 dans les conditions optimales, la coulisse 17 peut encore être déplacée, par exemple manuellement, dans le sens de l'axe X.On the machine frame there is still a slide 17 which supports a grinding wheel 18 intended to machine the part 1. The slide is movable in translation on the frame along an axis transverse Y, as in conventional machines, its displacement being obtained either manually or using a motor not shown. In the case of fig. 2, the Y axis and the axis of rotation of the grinding wheel 18 are oriented respectively perpendicular and parallel to the X axis, but different orientations of these axes could also suit. To place the grinding wheel 18 in the position allowing machine part 1 in optimal conditions, the slide 17 can still be moved, for example manually, in the direction of the X axis.

Le fonctionnement de la machine à meuler représentée sur la fig. 2 est le suivant. La pièce à usiner 1 une fois fixée dans la broche 11, la poupée 10 est disposée sur les glissières 13 en un endroit lui permettant de se déplacer en direction du support 16 d'une distance au moins égale à la longueur devant être meulée. Dans cette position de la poupée 10, l'extrémité libre de la pièce 1 doit être engagée dans le support 16 sans le dépasser. La coulisse 17 est alors déplacée suivant l'axe X de manière à amener la meule 18 aussi près que possible du support 16, sans toutefois le toucher, puis suivant l'axe Y pour placer la meule à une distance de l'axe aa' égale au rayon que doit avoir la pièce terminée. Après la mise en rotation de la pièce 1 et de la meule 18, la translation de la poupée 10 vers le support 16 peut commencer. L'extrémité de la pièce 1 entre alors en contact de la meule 18 pour que celle-ci amène par abrasion son diamètre à la valeur voulue. La meule 18 étant placée au voisinage immédiat du support 16, la partie de la pièce 1 qui est soumise à l'action de l'outil présente un très faible porte à faux. La flexion de la pièce est dans ces conditions négligeable, ce qui garantit une précision d'usinage élevée sur une longueur en principe arbitraire, égale au déplacement de la poupée. Bien entendu si le diamètre de la pièce 1 est faible, et sa longueur importante, son extrémité usinée devra être guidée, en l'introduisant par exemple dans un tube non représenté. The operation of the grinding machine shown in the fig. 2 is as follows. The workpiece 1 once fixed in the spindle 11, the doll 10 is arranged on the slides 13 in a place allowing it to move towards the support 16 at a distance at least equal to the length in front to be ground. In this position of the doll 10, the end free of part 1 must be engaged in support 16 without exceed it. The slide 17 is then moved along the axis X so as to bring the grinding wheel 18 as close as possible to the support 16, without touching it, then along the Y axis to place the grinding wheel at a distance from the axis aa 'equal to radius that the finished part must have. After the implementation rotation of the part 1 and of the grinding wheel 18, the translation of the doll 10 to support 16 can start. The end of the part 1 then comes into contact with the grinding wheel 18 so that this brings by abrasion its diameter to the desired value. The grinding wheel 18 being placed in the immediate vicinity of the support 16, the part of part 1 which is subjected to the action of the tool has a very small overhang. Bending of the part is in these conditions negligible, which guarantees a high machining precision over a length in principle arbitrary, equal to the displacement of the doll. Of course if the diameter of the piece 1 is small, and its length important, its machined end must be guided, introducing it for example into a tube not shown.

Avec la machine à meuler qui vient d'être décrite il a été possible d'obtenir, sans difficulté particulière, des pièces cylindriques de 0.05 mm de diamètre sur 50 mm de long, avec une tolérance sur le diamétre de l'ordre du micromètre. Le rapport K, précédemment défini, de la longueur sur le diamètre vaut dans ce cas 1000, soit dix fois mieux que ce que permet d'obtenir une machine de type "centerless".With the grinding machine which has just been described, it has been possible, without particular difficulty, to obtain parts cylindrical 0.05 mm in diameter and 50 mm long, with a tolerance on the diameter of the order of a micrometer. The previously defined ratio K of length over diameter worth 1000 in this case, ten times better than what is allowed to obtain a "centerless" type machine.

Pour étendre les possibilités d'usinage de la machine décrite, elle peut avantageusement comporter encore un appareil de commande numérique 20, programmable et fournissant un signal multiple de commande S. Cet appareil ne sera pas décrit car de telles commandes numériques sont connues en soi. Le signal de commande S agit, par l'intermédiaire de liaisons électriques non représentées, sur le moteur 14, et sur le moteur de la coulisse 17 qui entraíne celle-ci parallèlement à l'axe Y. Dans ces conditions la poupée 10 et la coulisse 17 peuvent être déplacées, respectivement selon les axes X et Y, par l'appareil de commande 20, et cet appareil être progammé pour que la pièce 1 soit usinée de façon que son diamètre varie, au moins sur une partie de sa longueur, selon une loi prédéterminée. Un exemple d'une pièce ainsi usinée est représenté sur la fig. 5. La machine comporte une autre meule 21, qui peut être disposée sur une autre coulisse 22. Cette coulisse, similaire à la coulisse 17, est mobile selon les axes X et Y, le déplacement selon l'axe Y étant préférentiellement obtenu au moyen d'un moteur non représenté recevant le signal de commande S. La meule 18 peut être une meule d'ébauchage, et la meule 21 une meule de finition. Cette dernière meule doit alors être placée à une distance un peu plus grande du support 16 que la meule 18, et le progamme de l'appareil de commande 20 tenir compte de ce décalage. L'utilisation de deux meules permet d'accroítre la rapidité d'usinage et d'améliorer l'état de la surface usinée.To extend the machining possibilities of the machine described, it can advantageously also include an apparatus for digital control 20, programmable and providing a signal control multiple S. This device will not be described because of such numerical controls are known per se. The signal from command S acts, via electrical connections not shown, on the engine 14, and on the engine of the slide 17 which drives it parallel to the Y axis. Under these conditions the doll 10 and the slide 17 can be moved, respectively along the X and Y axes, by the control unit 20, and this unit be programmed for that the part 1 is machined so that its diameter varies, at less over part of its length, according to a law predetermined. An example of a part thus machined is shown in fig. 5. The machine has a another grinding wheel 21, which can be arranged on another slide 22. This slide, similar to slide 17, is movable according to X and Y axes, the displacement along the Y axis being preferably obtained by means of a motor not shown receiving the control signal S. The grinding wheel 18 can be a roughing wheel, and wheel 21 a finishing wheel. This last wheel must be placed at a distance a little larger of the support 16 than the grinding wheel 18, and the program of the control unit 20 take this offset into account. The use of two grinding wheels increases the speed machining and improve the condition of the machined surface.

Le support 16, dont une forme de réalisation est représentée sur les fig. 3a et 3b, est un élément essentiel de la machine à meuler selon l'invention. La référence 25 désigne sur ces figures un pied de soutien rigidement fixé sur le bâti de la machine, ce pied étant montré de profit sur la fig. 3a et en plan sur la fig. 3b. La partie libre du pied présente une encoche 26, en forme de V, dans laquelle est disposée la pièce à usiner 1. L'encoche est délimitée par une face 27 qui comporte, dans le cas présent, deux faces planes 28 et 29, parallèles à l'axe de révolution aa' et faisant entre elles un angle d'environ 90 degrés. La face 27 sert d'appui à la pièce 1 dont la forme, avant son usinage, est celle d'un cylindre de section circulaire. Afin de diminuer l'usure, les faces planes 28 et 29 sont avantageusement constituées par des plaquettes en matériau dur. La pièce à usiner 1 est en outre fermement maintenue dans l'encoche 26 par un rouleau presseur 30. Ce rouleau est mobile en rotation autour d'un axe parallèle à l'axe aa', et il exerce une force suffisante, typiquement de 50 kg, sur la pièce 1 pour l'empêcher de se déplacer radialement tout en lui permettant de tourner. Enfin le support 16 est disposé sur le bâti de la machine de manière que la ligne joignant le centre du rouleau 30 à celui de la pièce 1 soit une droite perpendiculaire passant par la ligne définie par l'intersection des faces planes 28 et 29 de l'encoche 26. Support 16, an embodiment of which is shown in fig. 3a and 3b, is an essential part of the machine to be ground according to the invention. Reference 25 designates on these figures a support foot rigidly fixed on the frame of the machine, this foot being shown profitably in FIG. 3a and in plan on fig. 3b. The free part of the foot has a notch 26, V-shaped, in which the part is arranged to be machined 1. The notch is delimited by a face 27 which comprises, in the present case, two plane faces 28 and 29, parallel to the axis of revolution aa 'and forming between them a angle of about 90 degrees. The face 27 serves as a support for the part 1, the shape of which, before being machined, is that of a cylinder circular section. In order to reduce wear, the flat faces 28 and 29 are advantageously constituted by plates made of hard material. Workpiece 1 is also firmly held in the notch 26 by a pressure roller 30. This roller is movable in rotation about an axis parallel to axis aa ', and it exerts a sufficient force, typically of 50 kg, on piece 1 to prevent it from moving radially while allowing it to rotate. Finally the support 16 is arranged on the machine frame so that the line joining the center of the roller 30 to that of the piece 1 is a perpendicular straight line passing through the line defined by the intersection of the planar faces 28 and 29 of notch 26.

Les positions relatives de la pièce à usiner 1, du support 16 et des meules 18 et 21 sont représentées, dans une vue de profil, sur la fig. 4. Dans cette disposition, qui correspond à celle des fig. 2 et 5, les centres des meules et de la pièce à usiner sont alignés sur une même droite horizontale.The relative positions of the workpiece 1, of the support 16 and grinding wheels 18 and 21 are shown, in a view of profile, in fig. 4. In this provision, which corresponds to that of fig. 2 and 5, the centers of the grinding wheels and the part to be machined are aligned on the same horizontal line.

Claims (7)

  1. A grinding machine for machining parts, especially of hard metal generated by rotation, exhibiting a high length-to-diameter ratio comprising:
    a framework and a headstock (10) arranged thereon including a part-carrying arbor (11), said arbor driving a part to be machined (1) in rotation around its axis of revolution (aa'), a slider (17) supporting a grinder (18) turning around an axis of rotation,
    a support (16) secured on said framework and serving as bearing for a portion of the part to be machined (1) lying outside said arbor (11),
    characterized in that it includes
    means (13, 14, 15) for displacing said headstock (10) on the framework along a longitudinal axis (X) parallel to said axis of revolution (aa'), said grinder (18) being arranged proximate said support (16) and in contact with said part in a manner to bring the diameter through abrasion thereof to the desired diameter over a length equal to the displacement of the headstock, and
    another grinder (21) working on the part (1) simultaneously with the grinder (18) and arranged substantially opposite the grinder (18).
  2. A machine according to claim 1, characterized in that the grinder (18) is for rough grinding and the other grinder (21) is for finish grinding, the part (1) being machined in this order by the two grinders.
  3. A machine according to claim 1 or 2 characterized in that the axis of rotation of the grinder (18) is inclined relative to the longitudinal axis (X).
  4. A machine according to any of the preceding claims, characterized in that said slider (17) is movable in translation on said framework along a transversal axis (Y), and in that the displacements of the headstock and of the slider are brought about by means of a digital control arrangement (20) programmed so that the diameter of said part to be machined (1) varies according to a predetermined law.
  5. A machine according to claim 4, characterized in that said transversal axis (Y) is perpendicular to said longitudinal axis (X).
  6. A machine according to any of the preceding claims, characterized in that the other grinder (21) is arranged on another slider (22).
  7. A machine according to claim 6, characterized in that said other slider (22) is movable in translation on said framework along said transversal axis (Y), and in that the displacement of the other slider is brought about by means of said digital control arrangement (20).
EP94112956A 1993-08-24 1994-08-19 Grinding machine Expired - Lifetime EP0640435B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH2509/93 1993-08-24
CH02509/93A CH689350A5 (en) 1993-08-24 1993-08-24 Grinding machine.
CH250993 1993-08-24

Publications (2)

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EP0640435A1 EP0640435A1 (en) 1995-03-01
EP0640435B1 true EP0640435B1 (en) 1999-12-01

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EP94112956A Expired - Lifetime EP0640435B1 (en) 1993-08-24 1994-08-19 Grinding machine

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US (1) US5667432A (en)
EP (1) EP0640435B1 (en)
JP (1) JP3331545B2 (en)
CH (1) CH689350A5 (en)
DE (1) DE69421859T2 (en)

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Also Published As

Publication number Publication date
DE69421859D1 (en) 2000-01-05
US5667432A (en) 1997-09-16
EP0640435A1 (en) 1995-03-01
DE69421859T2 (en) 2000-05-18
JPH0775948A (en) 1995-03-20
CH689350A5 (en) 1999-03-15
JP3331545B2 (en) 2002-10-07

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