EP0434533B1 - Machine for the superfinishing of shafts, particularly camshafts - Google Patents

Machine for the superfinishing of shafts, particularly camshafts Download PDF

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Publication number
EP0434533B1
EP0434533B1 EP19900403620 EP90403620A EP0434533B1 EP 0434533 B1 EP0434533 B1 EP 0434533B1 EP 19900403620 EP19900403620 EP 19900403620 EP 90403620 A EP90403620 A EP 90403620A EP 0434533 B1 EP0434533 B1 EP 0434533B1
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EP
European Patent Office
Prior art keywords
arms
machine
abrasive
shaft
arm
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Expired - Lifetime
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EP19900403620
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German (de)
French (fr)
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EP0434533A1 (en
Inventor
Jean-Claude Pineau
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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
    • B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
    • B24B21/18—Accessories
    • 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
    • B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
    • B24B19/08—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding non-circular cross-sections, e.g. shafts of elliptical or polygonal cross-section
    • B24B19/12—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding non-circular cross-sections, e.g. shafts of elliptical or polygonal cross-section for grinding cams or camshafts

Definitions

  • the present invention relates to a machine for machining abrasive superfinishing of the bearing surfaces of shafts, in particular cams or cams and trunnions of a camshaft, the shaft being taken between centers and driven by a movement of rotation around 50h axis during machining, this machine comprising a plurality of arms mounted on the same support so as to be able to pivot in parallel planes perpendicular to the axis of the shaft to be machined, the arms being distributed in two groups on either side of the shaft so as to be able to pivot around two spaced parallel axes, each arm comprising an operating and pressure means for applying an abrasive with a predetermined pressure against one of the surfaces to be machined from tree.
  • canopies comprising, for each span to be machined, two opposite arms pivoting in opposition under the action of a common operating means such as a jack, each of said two arms carrying at least one means of applying an abrasive strip so that when the two arms are tightened under the action of the operating means, the application means press an abrasive strip from two opposite sides against the range to be machined.
  • the abrasive belts are generally advanced step by step. , the strips being stationary during the actual machining.
  • the present invention relates to a machine for superfinishing machining by a simple and compact structure, allowing the simultaneous machining of several spans even very close together on the same shaft.
  • the invention also relates to a machine for superfinishing machining by grinding with continuous unwinding of the abrasive belts during machining.
  • the subject of the invention is also a machine for superfinishing machining by grinding allowing a simple and rapid replacement of the abrasive belts and eliminating the losses of belt when changing the abrasive belts.
  • the machine for machining abrasive superfinishing of the bearings of a shaft in particular cams or cams or trunnions of a camshaft, the shaft being taken between centers and driven by a movement of rotation about their axis during machining, comprises a plurality of arms mounted on the same support so as to be able to pivot in parallel planes perpendicular to the axis of the camshaft to be machined.
  • the arms are distributed in two groups on either side of the camshaft so as to be able to pivot around two spaced parallel axes.
  • Each arm comprises an operating and pressure means for applying an abrasive with a predetermined pressure against one of the surfaces to be machined from the shaft.
  • an abrasive belt unwound from a new tape supply reel and rewound on a worn tape take-up reel is associated with each of said arms.
  • Each of said arms comprises means for applying an abrasive strip against the surface to be machined.
  • the machine comprises common means for the continuous drive, during machining, of all the coils receiving the abrasive belts.
  • each arm is equipped with means for the removable reception of a removable cassette containing a supply reel and a reel for receiving an abrasive strip and comprising a roller for applying this strip against the surface to be machined, as well as means for coupling the take-up reel of the cassette with said common drive means.
  • Said coupling means may comprise a shaft end mounted in rotation in said arm and carrying on one side of the arm elements for coupling with the take-up reel of the cassette and on the other side of the arm a wheel or pulley connected by a belt or transmission similar to a wheel or pulley of a common drive shaft for the cassette reels of all the arms, this shaft serving as a pivot axis for all the arms located on one side of the shaft to be machined.
  • the arms being distributed over two pivot axes arranged on both sides of the shaft to be machined, the two pivot axes consist of two drive shafts connected together by a belt transmission or the like.
  • each arm can also be simply fitted with an abrasive tape application roller, in which case the abrasive belts are removed from untrained supply coils, mounted on an axis. common, and are rewound on driven take-up coils mounted on a drive shaft common to the coils of the abrasive belts for all the arms of the machine.
  • the arms are distributed on either side of the shaft to be machined in such a way that the means of applying an abrasive strip intended for machining the successive bearings of the shaft are supported in alternating from opposite sides of the shaft against the surfaces to be machined. This arrangement ensures minimal bending of the shaft during machining.
  • the arms can advantageously be pivotally mounted around the two axes so that each time two arms pivot in the same plane passing between two successive surfaces to be machined, the means for applying the abrasive strip being arranged on the opposite sides of said arms.
  • a superfinishing machine by grooming for the simultaneous machining of all the camshaft cams comprises a headstock 1 and a tailstock 2 making it possible to take a camshaft 3 between points in horizontal position, means not shown being provided elsewhere for driving the camshaft 3 in rotation about its axis.
  • the doll 1 and the tailstock 2 are also driven in an oscillating movement back and forth along their axis, as is well known for grooming.
  • camshaft 3 comprising eight cams 4 a and 4 h in the example shown is installed a grooming assembly 5 mounted in a fixed position on a machine frame 6.
  • the grooming assembly 5 comprises, as shown in FIG. 2, two vertical, parallel, spaced flanges 7, between which eight arms 8 a at 8 h are pivotally mounted around two horizontal axes 9 a and 9 b extending, as shown in Figure 1, in the same horizontal plane located above the axis of the headstock 1 and the tailstock 2, parallel to this axis, in a symmetrical position on either side of a passing vertical plane by said axis.
  • the two axes 9 a and 9 b consist of two shafts, the two ends of which are mounted in rotation in the flanges 7.
  • the arms 8 a to 8 h are distributed over the two shafts 9 a and 9 b in such a way that four arms 8 a , 8 c , 8 e and 8 g are located on the shaft 9 a and the four other arms 8 b , 8 d , 8 f and 8 h on the shaft 9 b , so that the arms are opposite in pairs of arms 8 a / 8 b , 8 c / 8 d , 8 e / 8 f and 8 g / 8 h rotating in parallel planes.
  • the arm 8 carries, at its lower end, a cassette 10 containing an abrasive strip 11 which can be unwound from a supply reel 12 to be rewound on a take-up reel 13 after passing over an application roller 14 at the place where the abrasive strip is exposed towards the outside of the cassette 10.
  • the latter is arranged on one side of the arm 8 in such a way that the application roller 14 is at the height of the camshaft 3 and is turned towards this last.
  • the cassette 10 is removably connected to the arm 8 by means not shown, comparable to those well known for maintaining cassettes in other applications.
  • the arm 8 For the purpose of rotating the take-up reel 13 of the cassette 10, the arm 8 carries, as shown in FIG. 2, a shaft end 15 rotatably mounted in the arm 8 and bearing on one side of the arm 8 of the coupling means not shown for the take-up reel 15 of the cassette 10 and on the other side of the arm 8 a pulley 16.
  • the pulley 16 is connected by a belt 17 to a pulley 18 fixed on the shaft 9 around which the arm 8 is pivotally mounted.
  • the two shafts 9 a and 9 b also each carry a pulley 19 for the purpose of coupling them by a transmission belt 20.
  • a geared motor 21 fixed on one of the flanges 7 and coupled with the shaft 9 b thus ensures the rotational drive, by means of belt transmissions 20 and 17, of the receiving coils 15 of the cassettes 10 of all the arms 8 and consequently abrasive belts 11 contained in the cassettes 10.
  • FIGS 3 and 4 illustrate another embodiment of a superfinishing machine according to the invention which, while having the same general structure as the machine according to Figures 1 and 2, differs from the latter by the fact that the abrasive belts 11 are not presented in cassettes detachably attached to the arm; the abrasive belts 11 intended for the machining of the different cams 4 a to 4 h of the camshaft 3 are here withdrawn from supply coils 23 a to 23 h mounted on a common axis 24 and are rewound on receiving coils 25 a at 25 h mounted on a common shaft 26 driven in rotation by a geared motor 27.
  • Each arm 8 a to 8 g controlled by its jack 22 carries at its lower end an application tool 28 a to 28 g comprising guide pulleys for the strip 11 and an application roller 29 for pressing the abrasive strip 11 against the concerned cam 4 of the shaft 3.
  • the mounting method shown and described with arms 8 pivotally mounted on two axes 9 a , 9 b so that the abrasive band application rollers intended for the machining of successive cams are pressed alternately from the sides opposite of the shaft against the cams to be machined has the advantage of avoiding bending of the shaft as it could occur in the event of different distribution of the arms on the two axes and especially in the case of mounting of all the arms on the same axis, that is to say of the support of all the abrasive band application rollers from the same side against the shaft to be machined.
  • the machine according to the invention can also be used, not only for the simultaneous superfinishing of the cams of a camshaft, but also for example for the simultaneous superfinishing of several bearings on other shafts, for example gearbox shafts of speed.
  • it is more particularly the simultaneous superfinishing of several eccentric and / or non-circular spans on the same shaft which has hitherto constituted a difficult or even impossible problem to solve, in particular when these spans are very close together as is the case on camshafts.

Description

La présente invention se rapporte à un machine d'usinage de superfinition par abrasif des portées d'arbres, notamment des cames ou des cames et des tourillons d'un arbre à cames, l'arbre étant pris entre pointes et animé d'un mouvement de rotation autour de 50h axe pendant l'usinage, cette machine comprenant une pluralité de bras montés sur un même support de manière à pouvoir pivoter dans des plans parallèles perpendiculaires à l'axe de l'arbre à usiner, les bras étant réparties en deux groupes de part et d'autre de l'arbre de manière à pouvoir pivoter autour de deux axes parallèles espacés, chaque bras comportant un moyen de manoeuvre et de pression pour appliquer un abrasif avec une pression prédéterminée contre une des portées à usiner de l'arbre.The present invention relates to a machine for machining abrasive superfinishing of the bearing surfaces of shafts, in particular cams or cams and trunnions of a camshaft, the shaft being taken between centers and driven by a movement of rotation around 50h axis during machining, this machine comprising a plurality of arms mounted on the same support so as to be able to pivot in parallel planes perpendicular to the axis of the shaft to be machined, the arms being distributed in two groups on either side of the shaft so as to be able to pivot around two spaced parallel axes, each arm comprising an operating and pressure means for applying an abrasive with a predetermined pressure against one of the surfaces to be machined from tree.

Jusqu'à présent, le toilage simultané de plusieurs portées d'un même arbre peut être effectué sur dais machines comprenant, pour chaque portée à usiner, deux bras opposés pivotant en opposition sous l'action d'un moyen de manoeuvre commun tel qu'un vérin, chacun desdits deux bras portant au moins un moyen d'application de bande abrasive de manière que lors du serrage des deux bras sous l'action du moyen de manoeuvre, les moyens d'application appuient une bande abrasive depuis deux côtés opposés contre la portée à usiner.Up to now, the simultaneous grooming of several spans of the same tree can be carried out on canopies comprising, for each span to be machined, two opposite arms pivoting in opposition under the action of a common operating means such as a jack, each of said two arms carrying at least one means of applying an abrasive strip so that when the two arms are tightened under the action of the operating means, the application means press an abrasive strip from two opposite sides against the range to be machined.

Les principaux inconvénients de ces machines connues résident dans la structure compliquée et dans l'encombrement important des ensembles de bras, de sorte qu'il est impossible, sur de telles machines, d'usiner simultanément, sur un même arbre, des portées relativement rapprochées. Par conséquent chaque arbre doit subir au moins deux usinages successifs, concernant chacun une partie seulement des portées, sur au moins deux machines successives.The main drawbacks of these known machines reside in the complicated structure and the large size of the arm assemblies, so that it is impossible, on such machines, to machine simultaneously, on the same shaft, relatively close spans . Consequently each tree must undergo at least two successive machining operations, each concerning only part of the spans, on at least two successive machines.

La même structure générale avec des paires de bras opposés pour appliquer un abrasif depuis deux côtés opposés contre une même portée d'un arbre à cames se retrouve sur les machines de superfinition par pierrage en deux étapes selon les documents GB-A-2 073 068 et GB-A-2 073 069.The same general structure with pairs of opposite arms for applying an abrasive from two opposite sides against the same bearing surface of a camshaft is found on superfinishing machines by two-stage honing according to documents GB-A-2,073,068 and GB-A-2,073,069.

Par ailleurs, sur les machines d'usinage par toilage par bandes abrasives, par exemple la machine de superfinition des cames d'arbres à cames selon le document DE-A-1 950 839, les bandes abrasives sont généralement avancées pas-à-pas, les bandes étant immobiles pendant l'usinage proprement dit.Furthermore, on machines for grinding by abrasive belts, for example the camshaft cam superfinishing machine according to document DE-A-1 950 839, the abrasive belts are generally advanced step by step. , the strips being stationary during the actual machining.

De plus, sur ces machines connues, la mise en place de bandes abrasives est relativement longue et compliquée et les trajets suivis par les bandes sont relativement longs, ce qui entraîne la perte d'une longueur relativement importante de bande abrasive au début et à la fin de chaque bobine de bande abrasive.In addition, on these known machines, the installation of abrasive belts is relatively long and complicated and the paths followed by the belts are relatively long, which results in the loss of a relatively large length of abrasive belt at the start and at the end. end of each reel of abrasive tape.

La présente invention a pour objet une machine d'usinage de superfinition par toilage de structure simple et compacte, permettant l'usinage simultané de plusieurs portées même très rapprochées sur un même arbre. L'invention a également pour objet une machine d'usinage de superfinition par toilage avec déroulement continu des bandes abrasives en cours d'usinage. L'invention a par ailleurs pour objet une machine d'usinage de superfinition par toilage permettant un remplacement simple et rapide des bandes abrasives et de supprimer les pertes de bande lors du changement des bandes abrasives.The present invention relates to a machine for superfinishing machining by a simple and compact structure, allowing the simultaneous machining of several spans even very close together on the same shaft. The invention also relates to a machine for superfinishing machining by grinding with continuous unwinding of the abrasive belts during machining. The subject of the invention is also a machine for superfinishing machining by grinding allowing a simple and rapid replacement of the abrasive belts and eliminating the losses of belt when changing the abrasive belts.

Telle que revendiquée, la machine d'usinage de superfinition par abrasif des portée d'un arbre, notamment des cames ou des cames ou des tourillons d'un arbre à cames, l'arbre étant pris entre pointes et animé d'un mouvement de rotation autour de leur axe pendant l'usinage, comprend une pluralité de bras montés sur un même support de manière à pouvoir pivoter dans des plans parallèles perpendiculaires à l'axe de l'arbre à cames à usiner. Les bras sont répartis en deux groupes de part et d'autre de l'arbre à cames de manière à pouvoir pivoter autour de deux axes parallèle espacés. Chaque bras comporte un moyen de manoeuvre et de pression pour appliquer un abrasif avec une pression prédéterminée contre une des portées à usiner de l'arbre. Selon l'invention, une bande abrasive déroulée d'un bobine débitrice de bande neuve et réenroulée sur une bobine réceptrice de bande usée est associée à chacun desdits bras. Chacun desdits bras comporte un moyen d'application de bande abrasive contre la portée à usiner. La machine comporte des moyens communs pour l'entraînement en continu, pendant l'usinage, de toutes les bobines réceptrices des bandes abrasives.As claimed, the machine for machining abrasive superfinishing of the bearings of a shaft, in particular cams or cams or trunnions of a camshaft, the shaft being taken between centers and driven by a movement of rotation about their axis during machining, comprises a plurality of arms mounted on the same support so as to be able to pivot in parallel planes perpendicular to the axis of the camshaft to be machined. The arms are distributed in two groups on either side of the camshaft so as to be able to pivot around two spaced parallel axes. Each arm comprises an operating and pressure means for applying an abrasive with a predetermined pressure against one of the surfaces to be machined from the shaft. According to the invention, an abrasive belt unwound from a new tape supply reel and rewound on a worn tape take-up reel is associated with each of said arms. Each of said arms comprises means for applying an abrasive strip against the surface to be machined. The machine comprises common means for the continuous drive, during machining, of all the coils receiving the abrasive belts.

Suivant un mode de réalisation, chaque bras est équipé de moyens pour la réception amovible d'une cassette amovible contenant une bobine débitrice et une bobine réceptrice de bande abrasive et comprenant un rouleau d'application de cette bande contre la portée à usiner, ainsi que des moyens de couplage de bobine réceptrice de la cassette avec lesdits moyens d'entraînement communs.According to one embodiment, each arm is equipped with means for the removable reception of a removable cassette containing a supply reel and a reel for receiving an abrasive strip and comprising a roller for applying this strip against the surface to be machined, as well as means for coupling the take-up reel of the cassette with said common drive means.

Lesdits moyens de couplage peuvent comprendre un bout d'arbre monté en rotation dans ledit bras et portant d'un côté du bras des éléments de couplage avec la bobine réceptrice de la cassette et de l'autre côté du bras une roue ou poulie reliée par une courroie ou transmission analogue à une roue ou poulie d'un arbre d'entraînement commun pour les bobines réceptrices de cassettes de tous les bras, cet arbre servant d'axe de pivotement pour tous les bras se trouvant d'un côté de l'arbre à usiner.Said coupling means may comprise a shaft end mounted in rotation in said arm and carrying on one side of the arm elements for coupling with the take-up reel of the cassette and on the other side of the arm a wheel or pulley connected by a belt or transmission similar to a wheel or pulley of a common drive shaft for the cassette reels of all the arms, this shaft serving as a pivot axis for all the arms located on one side of the shaft to be machined.

Les bras étant répartis sur deux axes de pivotement disposés des deux côtés de l'arbre à usiner, les deux axes de pivotement sont constitués par deux arbres d'entraînement reliés entre eux par une transmission à courroie ou analogue.The arms being distributed over two pivot axes arranged on both sides of the shaft to be machined, the two pivot axes consist of two drive shafts connected together by a belt transmission or the like.

Au lieu d'être prévu pour recevoir une cassette de bande amovible abrasive, chaque bras peut également être équipé simplement d'un rouleau d'application de bande abrasive, auquel cas les bandes abrasives sont retirées de bobines débitrices non entraînées, montées sur un axe commun, et sont réenroulées sur des bobines réceptrices entraînées montées sur un arbre d'entraînement commun aux bobines des bandes abrasives pour tous les bras de la machine.Instead of being designed to receive a removable abrasive tape cassette, each arm can also be simply fitted with an abrasive tape application roller, in which case the abrasive belts are removed from untrained supply coils, mounted on an axis. common, and are rewound on driven take-up coils mounted on a drive shaft common to the coils of the abrasive belts for all the arms of the machine.

Suivant le mode de réalisation préféré, les bras sont répartis de part et d'autre de l'arbre à usiner de telle manière que les moyens d'application de bande abrasive destinés à l'usinage des portées successives de l'arbre soient appuyés en alternance depuis les côtés opposés de l'arbre contre les portées à usiner. Cette disposition assure une flexion minimale de l'arbre en cours d'usinage.According to the preferred embodiment, the arms are distributed on either side of the shaft to be machined in such a way that the means of applying an abrasive strip intended for machining the successive bearings of the shaft are supported in alternating from opposite sides of the shaft against the surfaces to be machined. This arrangement ensures minimal bending of the shaft during machining.

Les bras peuvent être avantageusement montés pivotants autour des deux axes de manière que chaque fois deux bras pivotent dans un même plan passant entre deux portées successives à usiner, les moyens d'application de bande abrasive étant disposés sur les côtés opposés desdits bras.The arms can advantageously be pivotally mounted around the two axes so that each time two arms pivot in the same plane passing between two successive surfaces to be machined, the means for applying the abrasive strip being arranged on the opposite sides of said arms.

En se référant aux dessins schématiques annexés, on va décrire ci-après pous en détail deux modes de réalisation illustratifs et non limitatifs d'une machine conforme à l'invention; sur ces dessins :

  • la figure 1 représente une machine de superfinition par toilage conforme à l'invention, en coupe suivant I-I de la figure 2;
  • la figure 2 est une coupe suivant II-II de la figure 1 de cette même machine;
  • la figure 3 représente un autre mode de réalisation d'une machine de superfinition par toilage conforme à l'invention, en coupe suivant III-III de la figure 4;
  • la figure 4 est une coupe suivant IV-IV de la figure 3.
Referring to the accompanying schematic drawings, there will be described below in detail two illustrative and nonlimiting embodiments of a machine according to the invention; on these drawings:
  • FIG. 1 represents a machine for superfinishing by grooming according to the invention, in section along II of FIG. 2;
  • Figure 2 is a section along II-II of Figure 1 of the same machine;
  • FIG. 3 represents another embodiment of a machine for superfinishing by grooming according to the invention, in section along III-III of FIG. 4;
  • FIG. 4 is a section on IV-IV of FIG. 3.

Selon les figures 1 et 2, une machine de superfinition par toilage pour l'usinage simultané de toutes les cames d'arbres à cames comprend une poupée 1 et une contrepointe 2 permettant de prendre un arbre à cames 3 entre pointes en position horizontale, des moyens non représentés étant prévus par ailleurs pour entraîner l'arbre à cames 3 en rotation autour de son axe. La poupée 1 et la contrepointe 2 sont par ailleurs animés d'un mouvement oscillatoire de va-et-vient suivant leur axe, comme cela est bien connu pour le toilage.According to FIGS. 1 and 2, a superfinishing machine by grooming for the simultaneous machining of all the camshaft cams comprises a headstock 1 and a tailstock 2 making it possible to take a camshaft 3 between points in horizontal position, means not shown being provided elsewhere for driving the camshaft 3 in rotation about its axis. The doll 1 and the tailstock 2 are also driven in an oscillating movement back and forth along their axis, as is well known for grooming.

Au-dessus de l'arbre à cames 3 comportant huit cames 4a et 4h dans l'exemple représenté est installé un ensemble de toilage 5 monté en position fixe sur un bâti de machine 6.Above the camshaft 3 comprising eight cams 4 a and 4 h in the example shown is installed a grooming assembly 5 mounted in a fixed position on a machine frame 6.

L'ensemble de toilage 5 comprend, comme le montre la figure 2, deux flasques 7 verticaux, parallèles, espacés, entre lesquels huit bras 8a à 8h soit montés pivotants autour de deux axes 9a et 9b horizontaux s'étendant, comme le montre la figure 1, dans un même plan horizontal situé au-dessus de l'axe de la poupée 1 et de la contrepointe 2, parallèlement à cet axe, en position symétrique de part et d'autre d'un plan vertical passant par ledit axe. Les deux axes 9a et 9b sont constitués par deux arbres dont les deux extrémités sont montées en rotation dans les flasques 7.The grooming assembly 5 comprises, as shown in FIG. 2, two vertical, parallel, spaced flanges 7, between which eight arms 8 a at 8 h are pivotally mounted around two horizontal axes 9 a and 9 b extending, as shown in Figure 1, in the same horizontal plane located above the axis of the headstock 1 and the tailstock 2, parallel to this axis, in a symmetrical position on either side of a passing vertical plane by said axis. The two axes 9 a and 9 b consist of two shafts, the two ends of which are mounted in rotation in the flanges 7.

Il est à noter que les bras 8a à 8h sont répartis sur les deux arbres 9a et 9b de telle manière que quatre bras 8a, 8c, 8e et 8g se trouvent sur l'arbre 9a et les quatre autres bras 8b, 8d, 8f et 8h sur l'arbre 9b, de telle manière que les bras soient opposés par paires de bras 8a/8b, 8c/8d, 8e/8f et 8g/8h pivotant dans des plans parallèles.It should be noted that the arms 8 a to 8 h are distributed over the two shafts 9 a and 9 b in such a way that four arms 8 a , 8 c , 8 e and 8 g are located on the shaft 9 a and the four other arms 8 b , 8 d , 8 f and 8 h on the shaft 9 b , so that the arms are opposite in pairs of arms 8 a / 8 b , 8 c / 8 d , 8 e / 8 f and 8 g / 8 h rotating in parallel planes.

Dans la mesure où les différents bras 8a à 8h sont identiques on va décrire par la suite les bras, leur fonction et les éléments qui y sont associés en considérant un seul bras référencé 8.Insofar as the different arms 8 a to 8 h are identical, the arms, their function and the elements associated with them will be described below by considering a single arm referenced 8.

Le bras 8 porte, à son extrémité inférieure, une cassette 10 contenant une bande abrasive 11 pouvant être dévidée d'une bobine débitrice 12 pour être réenroulée sur une bobine réceptrice 13 après passage sur un rouleau d'application 14 à l'endroit duquel la bande abrasive est exposée vers l'extérieur de la cassette 10. Cette dernière est disposée d'un côté du bras 8 de telle manière que le rouleau d'application 14 se trouve à la hauteur de l'arbre à cames 3 et soit tourné vers ce dernier. La cassette 10 est reliée de façon ammovible au bras 8 par des moyens non représentés, comparables à ceux bien connus pour le maintien de cassettes dans d'autres applications.The arm 8 carries, at its lower end, a cassette 10 containing an abrasive strip 11 which can be unwound from a supply reel 12 to be rewound on a take-up reel 13 after passing over an application roller 14 at the place where the abrasive strip is exposed towards the outside of the cassette 10. The latter is arranged on one side of the arm 8 in such a way that the application roller 14 is at the height of the camshaft 3 and is turned towards this last. The cassette 10 is removably connected to the arm 8 by means not shown, comparable to those well known for maintaining cassettes in other applications.

En vue de l'entraînement en rotation de la bobine réceptrice 13 de la cassette 10, le bras 8 porte, comme le montre la figure 2, un bout d'arbre 15 monté en rotation dans le bras 8 et portant d'un côté du bras 8 des moyens d'accouplement non représentés pour la bobine réceptrice 15 de la cassette 10 et de l'autre côté du bras 8 une poulie 16. La poulie 16 est reliée par une courroie 17 à une poulie 18 fixée sur l'arbre 9 autour duquel le bras 8 est monté pivotant.For the purpose of rotating the take-up reel 13 of the cassette 10, the arm 8 carries, as shown in FIG. 2, a shaft end 15 rotatably mounted in the arm 8 and bearing on one side of the arm 8 of the coupling means not shown for the take-up reel 15 of the cassette 10 and on the other side of the arm 8 a pulley 16. The pulley 16 is connected by a belt 17 to a pulley 18 fixed on the shaft 9 around which the arm 8 is pivotally mounted.

Les deux arbres 9a et 9b portent par ailleurs chacun une poulie 19 en vue de leur couplage par une courroie de transmission 20.The two shafts 9 a and 9 b also each carry a pulley 19 for the purpose of coupling them by a transmission belt 20.

Un motoréducteur 21 fixé sur l'un des flasques 7 et couplé avec l'arbre 9b assure ainsi l'entraînement en rotation, par l'intermédiaire des transmissions à courroie 20 et 17, des bobines réceptrices 15 des cassettes 10 de tous les bras 8 et par conséquent des bandes abrasives 11 contenues dans les cassettes 10.A geared motor 21 fixed on one of the flanges 7 and coupled with the shaft 9 b thus ensures the rotational drive, by means of belt transmissions 20 and 17, of the receiving coils 15 of the cassettes 10 of all the arms 8 and consequently abrasive belts 11 contained in the cassettes 10.

Le mouvement de pivotement des bras 8 en vue de l'application des bandes abrasives 11 des cassettes 10 contre les cames 4 de l'arbre 3, dans la position indiquée en trait plein sur la figure 1, et en vue de leur écartement de l'arbre 3, comme indiqué en trait mixte sur la figure 1, est assuré pour chaque bras 8 par un vérin 22 à double effet, à pression d'alimentation contrôlée.The pivoting movement of the arms 8 for the application of the abrasive belts 11 of the cassettes 10 against the cams 4 of the shaft 3, in the position indicated in solid lines in FIG. 1, and with a view to their spacing from the 'shaft 3, as indicated in phantom in Figure 1, is provided for each arm 8 by a double-acting cylinder 22, with controlled supply pressure.

Les figures 3 et 4 illustrent un autre mode de réalisation d'une machine de superfinition conforme à l'invention qui, tout en ayant la même structure générale que la machine suivant les figures 1 et 2, diffère de cette dernière par le fait que les bandes abrasives 11 ne sont pas présentées dans des cassettes fixées de façon amovible au bras; les bandes abrasives 11 destinées à l'usinage des différentes cames 4a à 4h de l'arbre à came 3 sont ici retirées de bobines débitrices 23a à 23h montées sur un axe commun 24 et sont réenroulées sur des bobines réceptrices 25a à 25h montées sur un arbre commun 26 entraîné en rotation par un motoréducteur 27. Chaque bras 8a à 8g commandé par son vérin 22 porte à son extrémité inférieure un outil d'application 28a à 28g comprenant des poulies de guidage pour la bande 11 et un rouleau d'application 29 pour appuyer la bande abrasive 11 contre la came 4 concernée de l'arbre 3.Figures 3 and 4 illustrate another embodiment of a superfinishing machine according to the invention which, while having the same general structure as the machine according to Figures 1 and 2, differs from the latter by the fact that the abrasive belts 11 are not presented in cassettes detachably attached to the arm; the abrasive belts 11 intended for the machining of the different cams 4 a to 4 h of the camshaft 3 are here withdrawn from supply coils 23 a to 23 h mounted on a common axis 24 and are rewound on receiving coils 25 a at 25 h mounted on a common shaft 26 driven in rotation by a geared motor 27. Each arm 8 a to 8 g controlled by its jack 22 carries at its lower end an application tool 28 a to 28 g comprising guide pulleys for the strip 11 and an application roller 29 for pressing the abrasive strip 11 against the concerned cam 4 of the shaft 3.

Etant donné que l'entraînement des bandes abrasives 11 s'effectue par les bobines réceptrices 25 séparées des bras 8, les axes de pivotement 9a, 9b des bras 8 ne sont pas des arbres d'entraînement et les transmissions à courroie 17, 20 suivant les figures 1 et 2 sont supprimées.Since the abrasive belts 11 are driven by the receiving coils 25 separated from the arms 8, the pivot axes 9 a , 9 b of the arms 8 are not drive shafts and the belt transmissions 17, 20 according to Figures 1 and 2 are deleted.

Il va de soi que les deux modes de réalisation représentés et décrits n'ont été donnés qu'à titre d'exemples illustratifs et non limitatifs et que de nombreuses modifications et variantes sont possibles dans le cadre de l'invention.It goes without saying that the two embodiments shown and described have been given only by way of illustrative examples and not limiting and that many modifications and variations are possible within the scope of the invention.

Ainsi, les bras pivotants 8 dont le nombre correspond au nombre de cames 4 à usiner simultanément pourraient être répartis différemment sur les deux axes de pivotement 9a et 9b voire pourraient même être tous disposés sur un seul axe. Cependant, le mode de montage représenté et décrit avec des bras 8 montés pivotants sur deux axes 9a, 9b de telle manière que les rouleaux d'application de bande abrasive destinés à l'usinage des cames successives soient appuyés en alternance depuis les côtés opposés de l'arbre contre les cames à usiner présente l'avantage d'éviter une flexion de l'arbre tel qu'elle pourrait se produire en cas de répartition différente des bras sur les deux axes et surtout en cas de montage de tous les bras sur un même axe, c'est-à-dire de l'appui de tous les rouleaux d'application de bande abrasive depuis le même côté contre l'arbre à usiner.Thus, the pivoting arms 8, the number of which corresponds to the number of cams 4 to be machined simultaneously, could be distributed differently on the two pivot axes 9 a and 9 b or could even all be arranged on a single axis. However, the mounting method shown and described with arms 8 pivotally mounted on two axes 9 a , 9 b so that the abrasive band application rollers intended for the machining of successive cams are pressed alternately from the sides opposite of the shaft against the cams to be machined has the advantage of avoiding bending of the shaft as it could occur in the event of different distribution of the arms on the two axes and especially in the case of mounting of all the arms on the same axis, that is to say of the support of all the abrasive band application rollers from the same side against the shaft to be machined.

L'utilisation d'un moyen de manoeuvre à force préétablie pour chaque bras permet à chaque bras de suivre parfaitement le profil de la came à usiner en appliquant la bande abrasive toujours avec la même pression contre la came. Bien entendu, il serait possible d'utiliser à cet effet des moyens autres que des vérins par exemple des systèmes mécaniques à ressort, mais les vérins à pression d'alimentation contrôlée représentent une solution particulièrement avantageuse.The use of a maneuvering force with preset force for each arm allows each arm to perfectly follow the profile of the cam to be machined by applying the abrasive strip always with the same pressure against the cam. Of course, it would be possible to use means other than jacks for this purpose, for example mechanical spring systems, but jacks with controlled supply pressure represent a particularly advantageous solution.

La machine conforme à l'invention peut également être utilisée, non seulement pour la superfinition simultanée des cames d'un arbre à cames, mais également par exemple pour la superfinition simultanée de plusieurs portées sur d'autres arbres, par exemple des arbres de boîte de vitesse. Cependant, c'est plus particulièrement la superfinition simultanée de plusieurs portées excentrées et/ou non circulaires sur un même arbre qui constituait jusqu'à présent un problème difficile, voire impossible à résoudre, notamment lorsque ces portées sont très rapprochées comme c'est le cas sur les arbres à cames.The machine according to the invention can also be used, not only for the simultaneous superfinishing of the cams of a camshaft, but also for example for the simultaneous superfinishing of several bearings on other shafts, for example gearbox shafts of speed. However, it is more particularly the simultaneous superfinishing of several eccentric and / or non-circular spans on the same shaft which has hitherto constituted a difficult or even impossible problem to solve, in particular when these spans are very close together as is the case on camshafts.

Claims (7)

  1. Superfinishing Machine, using abrasive material, to machine the journals of a shaft and more specifically the camlobes (4) or all the camlobes and journals of a camshaft (3), with the camshaft being held between centres (1, 2) and made to rotate around its axis during the machining process, the machine incorporating a plurality of arms (8) mounted on the same carriage (7), so that they can be made to pivot in parallel planes, these being perpendicular to the axis of rotation of the component, the arms (8) being divided into two groups (8a, 8c, 8e, 8g, 8b, 8d, 8f, 8h) located on either side of the workpiece, in such a way that they can be made to pivot around two adequately spaced pivot shafts (9a, 9b), each arm being provided with a mechanism (22), ensuring movement and pressure, in order to apply an abrasive material (11) with a predetermined load against one of the shaft journals which is to be machined, whereby an abrasive tape (11), which is unwound from a new tape feeding spool (12, 23) and rewound onto a used tape receiving spool (13, 25), is associated with each of the said arms (8), that each of the said arms is provided with a means (14, 29) of applying the abrasive tape against the journal (4) to be machined and that the machine incorporates common means, during the machining process, of continuously driving all the receiving spools (13, 25) of the abrasive tapes (11).
  2. Machine in accordance with claim 1, whereby each arm (8) is provided with a removable fixture, onto which can be fitted a removable cassette (10), housing an abrasive tape feeding spool (12) and an abrasive tape receiving spool (13), a roller (14) applying the tape against the journal to be machined, as well as the necessary means of coupling the receiving spool of the cassette to the said drive means.
  3. Machine in accordance with claim 2, whereby the said coupling means incorporate a small shaft (15) rotating within the said arm (8), carrying on one side of the arm the coupling arrangements with the cassette receiving spool (13), and on the other side of the arm, a wheel or pulley (16) connected by means of a drive-belt or a similar means of transmission (17) to the wheel or pulley (18) of a drive shaft (9) which is common to all the cassette receiving spools of all the arms, the drive shaft also acting as a pivot shaft for all the arms (8) located on one side of the workpiece.
  4. Machine in accordance with any of the previous claims, whereby the two pivot shafts (9a, 9b) for the two sets of arms (8), consist of two drive-shafts linked to each other by a drive belt or a similar device. (19, 20)
  5. Machine in accordance with claim 1, whereby each arm (8) is provided with an abrasive tape application roller (29) and the abrasive tapes (11), associated with all the arms, are unwound from the non-driven feed spools (23), mounted on a common shaft (24) and rewound on the driven tape receiving spools (25) mounted on a drive shaft (26) common to all tape receiving spools for all the machine arms.
  6. Machine in accordance with any of the above claims, whereby the arms (8) are equally positioned on either side of the component (3) to be machined, in such a way that the means for applying the abrasive tape (14, 29) used for machining the successive journals (4) of the workpiece are applied alternately from opposite sides of the component against the journals to be machined.
  7. Machine in accordance with claim 6, whereby the arms (8) are made to pivot around two axis (9a, 9b) in such a way that, each time, two arms (8a, 8b, 8c, 8d, 8e, 8f, 8g, 8h) pivot in the same plane between two successive journals to be machined, whilst the means for applying the abrasive tape (14, 29) are located on opposite sides of the said two arms.
EP19900403620 1989-12-19 1990-12-17 Machine for the superfinishing of shafts, particularly camshafts Expired - Lifetime EP0434533B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8916826A FR2655900B1 (en) 1989-12-19 1989-12-19 SUPERFINITION MACHINE FOR TREES, ESPECIALLY CAMSHAFTS.
FR8916826 1989-12-19

Publications (2)

Publication Number Publication Date
EP0434533A1 EP0434533A1 (en) 1991-06-26
EP0434533B1 true EP0434533B1 (en) 1993-09-15

Family

ID=9388704

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900403620 Expired - Lifetime EP0434533B1 (en) 1989-12-19 1990-12-17 Machine for the superfinishing of shafts, particularly camshafts

Country Status (4)

Country Link
EP (1) EP0434533B1 (en)
DE (1) DE69003366T2 (en)
ES (1) ES2044499T3 (en)
FR (1) FR2655900B1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4328006C1 (en) * 1993-08-20 1994-08-04 Thielenhaus Ernst Kg Machine for the two-stage machining of pre-ground shafts, in particular motor vehicle camshafts, by finish grinding
FR2724862B1 (en) * 1994-09-28 1996-12-27 Abramatic MACHINING MACHINE, PARTICULARLY MICROFINITION, FOR CAMSHAFTS
JP2820059B2 (en) * 1995-03-24 1998-11-05 トヨタ自動車株式会社 Polishing equipment
JP3661712B2 (en) * 1995-11-13 2005-06-22 トヨタ自動車株式会社 Lapping machine
JPH11285958A (en) 1998-04-03 1999-10-19 Toyota Motor Corp Polishing device
DE102015010942B4 (en) 2015-08-18 2023-11-09 Emag Holding Gmbh Method and device for grinding and precision machining

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1076581A (en) * 1953-04-30 1954-10-27 Machine designed to finish and polish cams
DE1950839A1 (en) * 1969-10-09 1971-05-13 Peter Nagel Device for finishing workpieces with a non-rotationally symmetrical shape
DE3011454C2 (en) * 1980-03-25 1984-04-05 Ernst Thielenhaus KG, 5600 Wuppertal Process for finishing camshafts
DE3011455C2 (en) * 1980-03-25 1982-08-19 Ernst Thielenhaus KG, 5600 Wuppertal Machine for the two-stage finishing of the ground cams of camshafts
DE8607694U1 (en) * 1986-03-20 1988-07-07 Maschinenfabrik Ernst Thielenhaus Gmbh, 5600 Wuppertal, De

Also Published As

Publication number Publication date
DE69003366D1 (en) 1993-10-21
FR2655900B1 (en) 1995-01-20
DE69003366T2 (en) 1994-02-03
EP0434533A1 (en) 1991-06-26
FR2655900A1 (en) 1991-06-21
ES2044499T3 (en) 1994-01-01

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