EP0560888B1 - Device for machining and facing resilient materials - Google Patents

Device for machining and facing resilient materials Download PDF

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Publication number
EP0560888B1
EP0560888B1 EP92901499A EP92901499A EP0560888B1 EP 0560888 B1 EP0560888 B1 EP 0560888B1 EP 92901499 A EP92901499 A EP 92901499A EP 92901499 A EP92901499 A EP 92901499A EP 0560888 B1 EP0560888 B1 EP 0560888B1
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EP
European Patent Office
Prior art keywords
grinding wheel
machining
machined
spindle
recesses
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EP92901499A
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German (de)
French (fr)
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EP0560888A1 (en
Inventor
Louis Rouyer
Jacques Bastin
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Createc Rollers
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Createc Rollers
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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
    • B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
    • B24B5/36—Single-purpose machines or devices
    • B24B5/37—Single-purpose machines or devices for grinding rolls, e.g. barrel-shaped rolls
    • 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
    • B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
    • B24B5/50—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor characterised by a special design with respect to properties of the material of non-metallic articles to be ground, e.g. strings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
    • B24D5/10—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor with cooling provisions, e.g. with radial slots

Definitions

  • the present invention relates to a wheel device for machining, including surfacing, elastic and semi-elastic materials.
  • Two machining techniques are known from grinding wheels: the so-called “sweeping” technique according to which a grinding wheel with a width smaller than the length of the workpiece, "sweeps” the said workpiece by moving in front of it at a distance desired, and the so-called “plunge” technique according to which the workpiece is attacked by a grinding wheel whose width is at least equal to the length of this workpiece so as to carry out the machining thereof without having to move it laterally (see for example GB-A-1 150 996).
  • the "sweeping" technique has the double advantage over the “plunging” technique, allowing the use of smaller grinding wheels and ensuring the machining of parts made of elastic or semi-elastic materials.
  • the relative movement between the grinding wheel and the workpiece is radial with respect to the latter, and if the workpiece is made of somewhat elastic material, there is necessarily a crushing of the surface which prevents non-controlling not only the correct dimensioning of the part, but also its final surface condition.
  • the pressure exerted by the grinding wheel always causes, more or less, a deflection of the part during machining and the result of this deflection is to give the finished part a rounded shape. more or less important undesirable.
  • the object of the present invention is to propose a wheel device for machining, including surfacing, parts made of elastic or semi-elastic materials, making it possible to use the "plunge” technique while retaining the advantages of the technique. "sweeping" with regard to compliance with the dimensions and the final surface condition.
  • the grinding wheel acting "plunging" is provided with means capable of ensuring for a certain time, at the end of the machining operation, the immobilization of the part being machined in such a way that its axis of rotation is , to the right of its support points, at an equal distance, relative to the axis of rotation of the grinding wheel, to the sum of the theoretical radius of the desired part and the radius of the grinding wheel.
  • the invention is defined by claim 1.
  • This arrangement makes it possible to obtain, after roughing, a part with precise dimensions, therefore with a precise shape, and with a surface finish as fine as desired, even if these are parts made of elastic materials.
  • it is an oleo-pneumatic device which immobilizes the part being machined on the indication of an approach detector through a timer when said part arrives at the desired position.
  • the device according to the invention is provided with means allowing, during the roughing period, a slight floating of the axis of rotation of the part during machining.
  • two open supports are provided, each of which is constituted by a part comprising two surfaces arranged at right angles to one another, on which the axis of the part being machined is likely to be supported along two of its generators, on lines located less than 180 ° from each other relative to said axis of the part, means being provided to prevent this axis from escaping from these supports during the fluctuations experienced by said part.
  • the control in rotation of the part during machining is obtained by a flexible control, which allows without disadvantage, during machining, a bending of the axis carrying said part .
  • an adjustable support is provided which can exert on the roller during machining, a controlled elastic thrust s exerting against the pressure exerted by the grinding wheel.
  • Another means of reducing the pressure exerted by the grinding wheel on the workpiece consists, according to the invention, in using a grinding wheel having, over its entire periphery, recesses arranged so as to produce with the active surface portions , an alternation such that the active surface / recesses ratio is constant on any plane perpendicular to a generatrix of the grinding wheel and passing through any point of this generatrix.
  • the leading edges of the recesses existing on the surface of the grinding wheel form, with a generator of said grinding wheel, an angle other than zero, the advantage of such an arrangement being a lesser wear of the grinding wheel at the same time as a less brutal attack on the part to be removed.
  • the recesses of the grinding wheel are constituted by helical grooves extending over the entire length of the grinding wheel, which allows a technically easier realization and increases the scouring effect of the recesses on the grinding wheel.
  • Figure 1 is a front view of a machining device according to the invention.
  • Figure 2 is a plan view of Figure 1.
  • Figure 3 is a section along III-III of Figure 1.
  • FIG. 4 shows, on a larger scale, a detail of FIG. 3.
  • the apparatus comprises a frame 1 carrying a grinding wheel 2 which rotates around an axis 3 integral with the output shaft of a motor 4 with two positions, one ensuring only the drive in rotation of the axis and the grinding wheel, and the other simultaneously impulsing them an axial back and forth movement (arrow 38).
  • the grinding wheel 2 has a diameter of 15 centimeters and has, over its entire periphery, recesses formed by crossed helical grooves with a depth of 10 millimeters and arranged so that the ratio of active surface / recesses is constant over any plane perpendicular to a generatrix of the grinding wheel passing through any point of this generatrix.
  • This ratio is, in this case, 1, but may vary, however preferably between 0.8 and 1.2.
  • a mobile assembly 6, consisting of two plates 7 and 8, is capable of sliding on the base of the frame 1 thanks to two rails 5 with crossed rollers cooperating with two grooves provided on the plate 7.
  • the plate 7 has an operating stick 31 secured to the movable part of an oleopneumatic device 32 controlled, through a timer 39, by an approach detector 33.
  • the plate 8 rotatably mounted on the plate 7 by means of a pivot 9, has an angular locking device which is not shown because it is not part of the invention. It carries, at its upper part, two rails 10 perpendicular to the rails 5, and two supports 11 and, on the side, a plate 29 on which an electric motor 28 is arranged.
  • the rails 10 allow a mobile assembly 13 (see FIG. 4) essentially consisting of two slides 14 and 15, to move parallel to the axis 3 of the grinding wheel.
  • the slide 14 comprises a sole 16 and a heel 17, the sole 16 carrying on its upper surface, a guide rail 18, and on its lower surface, two grooves 12 corresponding to the two rails 10 of the plate 8.
  • the slider 15 carries, on the first part, a groove corresponding to the guide rail 18 of the slider 14, on the second part, a threaded rod 19 which freely crosses the heel 17 of said slider 14 and is provided with two nuts 20 at its end, and thirdly, an axis 21 on which two double levers 22 freely rotate, each of which carries two free wheels 23.
  • a spring 24 is threaded on the threaded rod 19 and is supported, on one side, on the heel 17, and on the other side, on the rear of the slide 15.
  • the supports 11 are arranged, in an adjustable manner, on a rail 36 parallel to the rails 10 on which the moving element 13 moves.
  • Their head is constituted by an asymmetrical notch constituting an open support for receiving the axis 26 and which is formed by two surfaces arranged at right angles to each other, namely the upper horizontal surface of the support and the side of a vertical projection 39.
  • a mobile stop 35 is provided, the role of which will be explained below.
  • a roller 25 is shown during machining. It is mounted on an axis 26 placed on the head of the supports 11, the mobile stops 35 being arranged, by means not shown because they are not part of the invention at a certain distance from the axis 26, and having for effect of preventing it from escaping from the supports 11 while allowing it to float slightly.
  • the axis 26 is secured by a fitting device 34, to a flexible control 27 constituted by a spring itself secured to the output shaft of the motor 28 carried by the plate 29 of the plate 8 .
  • the machining begins, each grain of the grinding wheel acting, due to the back and forth movement which it is animated, on an area of the roller 25 and not only on a line, which improves the regularity of the machining.
  • the presence of the recesses on the grinding wheel favors the aspiration of shavings and dust, thus ensuring permanent cleaning of the grinding wheel.
  • the oleo-pneumatic device stops the assembly 6, thus immobilizing the supports of the roller 25.
  • the timer 39 is triggered and the machining continues in this position since the roller continues to rotate, as well as the grinding wheel 2. If one wishes to give a non-cylindrical shape to the roller 25, however, the control of the reciprocating movement of the grinding wheel 2 is stopped.
  • the time during which the workpiece will be left to rotate after reaching the defined position will preferably be between 10 and 30 seconds depending on the desired grain size.
  • the timer 39 moves the movable assembly 6 backward.
  • the engine 28 is stopped.
  • the roller 25 is removed and it is uncoupled from its flexible control.
  • the recesses of the grinding wheel 2 could be made other than by crossed helical grooves. They could, for example, be the reverse of the embodiment illustrated by the figures, the grooves becoming the active surface of the grinding wheel and the diamonds becoming recesses which would then be discontinuous.
  • the flexible control 27 could obviously be replaced by a flexible cable or even a device with one or more cardan joints.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Springs (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Abstract

PCT No. PCT/FR91/00972 Sec. 371 Date Oct. 18, 1993 Sec. 102(e) Date Oct. 18, 1993 PCT Filed Dec. 5, 1991 PCT Pub. No. WO92/10331 PCT Pub. Date Jun. 25, 1992.A grinding device is provided for machining and facing workpieces made of resilient or semi-resilient materials. Said device comprises means (31) for holding the workpiece being processed after the machining operation to allow facing thereof. Machining can be improved by allowing limited drift of the workpiece, providing a flexible rotational drive, applying back pressure and using a recessed grinding wheel. This device can be used particularly for machining and facing drive rollers for office machines.

Description

La présente invention concerne un dispositif à meule pour l'usinage, y compris le surfaçage, de matériaux élastiques et semi-élastiques.The present invention relates to a wheel device for machining, including surfacing, elastic and semi-elastic materials.

On connaît deux techniques d'usinage à partir de meules : la technique dite "de balayage" suivant laquelle une meule de largeur plus petite que la longueur de la pièce à usiner, "balaye" la dite pièce en se déplaçant devant elle à la distance voulue, et la technique dite "en plongée" suivant laquelle la pièce à usiner est attaquée par une meule dont la largeur est au moins égale à la longueur de cette pièce de manière à réaliser l'usinage de celle-ci sans avoir à la déplacer latéralement (voir par exemple GB-A-1 150 996).Two machining techniques are known from grinding wheels: the so-called "sweeping" technique according to which a grinding wheel with a width smaller than the length of the workpiece, "sweeps" the said workpiece by moving in front of it at a distance desired, and the so-called "plunge" technique according to which the workpiece is attacked by a grinding wheel whose width is at least equal to the length of this workpiece so as to carry out the machining thereof without having to move it laterally (see for example GB-A-1 150 996).

Chacune de ces techniques possède ses avantages et ses inconvénients.Each of these techniques has its advantages and disadvantages.

La technique "en balayage" présente sur la technique "en plongée", le double avantage de permettre une utilisation de meules plus petites et d'assurer l'usinage de pièces en matériaux élastiques ou semi-élastiques.The "sweeping" technique has the double advantage over the "plunging" technique, allowing the use of smaller grinding wheels and ensuring the machining of parts made of elastic or semi-elastic materials.

Dans la technique "en plongée", le mouvement relatif entre meule et pièce en usinage est radial par rapport à celle-ci, et si la pièce est en matière quelque peu élastique, il se produit nécessairement un écrasement de surface qui empêche de maîtriser non seulement la mise aux cotes correcte de la pièce, mais également son état de surface final. De plus, dans le cas de pièces un peu longues, la pression exercée par la meule provoque toujours, peu ou prou, un fléchissement de la pièce en cours d'usinage et le résultat de ce fléchissement est de donner à la pièce terminée un bombé indésirable plus ou moins important.In the "plunge" technique, the relative movement between the grinding wheel and the workpiece is radial with respect to the latter, and if the workpiece is made of somewhat elastic material, there is necessarily a crushing of the surface which prevents non-controlling not only the correct dimensioning of the part, but also its final surface condition. In addition, in the case of somewhat long parts, the pressure exerted by the grinding wheel always causes, more or less, a deflection of the part during machining and the result of this deflection is to give the finished part a rounded shape. more or less important undesirable.

C'est pourquoi, pour l'usinage de pièces en matériaux élastiques ou semi-élastiques, on utilise la technique "en balayage".This is why, for the machining of parts in elastic or semi-elastic materials, the "sweeping" technique is used.

Mais celle-ci présente, par rapport à la technique "en plongée", l'inconvénient de nécessiter plus de temps dans la mesure où il est nécessaire précisément que la meule "balaye" toute la longueur des pièces à usiner.However, compared to the "plunge" technique, this has the disadvantage of requiring more time since it is precisely necessary that the grinding wheel "sweeps" the entire length of the workpieces.

On peut certes remédier quelque peu à ce défaut en augmentant le nombre de machines à usiner surveillées par un personnel donné. Mais cela signifie un investissement supplémentaire risquant, à la limite, d'annuler l'intérêt économique de cette augmentation de production.This defect can certainly be remedied somewhat by increasing the number of machines to be monitored by a given staff. But that means an additional investment risking, ultimately, to cancel the economic interest of this increase in production.

La présente invention a pour but de proposer un dispositif à meule pour l'usinage, y compris le surfaçage, de pièces en matériaux élastiques ou semi-élastiques, permettant d'utiliser la technique "en plongée" tout en conservant les avantages de la technique "en balayage" en ce qui concerne le respect des cotes et l'état de surface final..The object of the present invention is to propose a wheel device for machining, including surfacing, parts made of elastic or semi-elastic materials, making it possible to use the "plunge" technique while retaining the advantages of the technique. "sweeping" with regard to compliance with the dimensions and the final surface condition.

A cet effet, on munit la meule agissant "en plongée" de moyens susceptibles d'assurer pendant un certain temps, en fin d'opération d'usinage, l'immobilisation de la pièce en usinage de telle manière que son axe de rotation soit, au droit de ses points d'appui, à une distance égale, par rapport à l'axe de rotation de la meule, à la somme du rayon théorique de la pièce souhaitée et du rayon de la meule . L'invention est définie par la revendication 1.To this end, the grinding wheel acting "plunging" is provided with means capable of ensuring for a certain time, at the end of the machining operation, the immobilization of the part being machined in such a way that its axis of rotation is , to the right of its support points, at an equal distance, relative to the axis of rotation of the grinding wheel, to the sum of the theoretical radius of the desired part and the radius of the grinding wheel. The invention is defined by claim 1.

Cette disposition permet d'obtenir, après dégrossissage, une pièce aux cotes précises, donc à la forme précise, et à l'état de surface aussi fin que désiré, et ce, même s'il s'agit de pièces en matériaux élastiques.This arrangement makes it possible to obtain, after roughing, a part with precise dimensions, therefore with a precise shape, and with a surface finish as fine as desired, even if these are parts made of elastic materials.

Dans une réalisation intéressante présentant cette caractéristique, c'est un dispositif oléo-pneumatique qui immobilise la pièce en cours d'usinage sur indication d'un détecteur d'approche à travers une minuterie lorsque la dite pièce arrive à la position désirée.In an interesting embodiment having this characteristic, it is an oleo-pneumatic device which immobilizes the part being machined on the indication of an approach detector through a timer when said part arrives at the desired position.

Selon une deuxième caractéristique, le dispositif selon l'invention est pourvu de moyens permettant, pendant la période de dégrossissage, un léger flottement de l'axe de rotation de la pièce en cours d'usinage.According to a second characteristic, the device according to the invention is provided with means allowing, during the roughing period, a slight floating of the axis of rotation of the part during machining.

Dans une réalisation intéressante présentant cette caractéristique, on prévoit deux appuis ouverts dont chacun est constitué par une pièce comportant deux surfaces disposées en équerre l'une par rapport à l'autre, sur lesquelles l'axe de la pièce en cours d'usinage est susceptible de s'appuyer suivant deux de ses génératrices, sur des lignes situées à moins de 180° l'une de l'autre par rapport au dit axe de la pièce, des moyens étant prévus pour empêcher cet axe d'échapper à ces appuis au cours des flottements subits par la dite pièce.In an interesting embodiment having this characteristic, two open supports are provided, each of which is constituted by a part comprising two surfaces arranged at right angles to one another, on which the axis of the part being machined is likely to be supported along two of its generators, on lines located less than 180 ° from each other relative to said axis of the part, means being provided to prevent this axis from escaping from these supports during the fluctuations experienced by said part.

On assure ainsi à la fois une meilleure attaque, par la meule, de la pièce en cours d'usinage, et une diminution du frottement de l'axe sur ses appuis.This ensures both a better attack, by the grinding wheel, of the part being machined, and a reduction in the friction of the axis on its supports.

Selon une autre caractéristique intéressante de l'invention, la commande en rotation de la pièce en cours d'usinage est obtenue par une commande souple, ce qui autorise sans inconvénient, pendant l'usinage, un fléchissement de l'axe portant la dite pièce.According to another advantageous characteristic of the invention, the control in rotation of the part during machining is obtained by a flexible control, which allows without disadvantage, during machining, a bending of the axis carrying said part .

Selon une autre caractéristique intéressante dans le cas d'usinage, y compris le surfaçage, des rouleaux d'entraînement des machines utilisées en bureautique, on prévoit un appui réglable pouvant exercer sur le rouleau en cours d'usinage, une poussée élastique contrôlée s'exerçant à l'encontre de la pression exercée par la meule.According to another advantageous characteristic in the case of machining, including surfacing, of the drive rollers of the machines used in office automation, an adjustable support is provided which can exert on the roller during machining, a controlled elastic thrust s exerting against the pressure exerted by the grinding wheel.

Ainsi peut-on diminuer, annuler, voire inverser, le fléchissement du dit rouleau en cours d'usinage .Thus we can reduce, cancel, or even reverse, the deflection of said roller during machining.

Un autre moyen de diminuer la pression exercée par la meule sur la pièce en usinage consiste, selon l'invention, à utiliser une meule présentant, sur l'ensemble de sa périphérie, des évidements disposés de manière à réaliser avec les portions de surface active, une alternance telle que le rapport surface active/évidements soit constant sur tout plan perpendiculaire à une génératrice de la meule et passant par un point quelconque de cette génératrice.Another means of reducing the pressure exerted by the grinding wheel on the workpiece consists, according to the invention, in using a grinding wheel having, over its entire periphery, recesses arranged so as to produce with the active surface portions , an alternation such that the active surface / recesses ratio is constant on any plane perpendicular to a generatrix of the grinding wheel and passing through any point of this generatrix.

Outre que l'on obtient ainsi une pression moindre sur la pièce en usinage, on assure également, grâce aux évidements, le non-encrassage de la meule et ce, avec un accroissement de l'effet d'abrasion grâce aux bords aval des évidements qui constituent autant de bords d'attaque.In addition to obtaining less pressure on the workpiece, it also ensures, thanks to the recesses, that the grinding wheel is not clogged, with an increase in the abrasion effect thanks to the downstream edges of the recesses. which constitute as many leading edges.

Suivant une autre caractéristique de l'invention, les bords d'attaque des évidements existant à la surface de la meule forment, avec une génératrice de la dite meule, un angle différent de zéro, l'avantage d'une telle disposition étant une moindre usure de la meule en même temps qu'une attaque moins brutale de la pièce à matière à enlever.According to another characteristic of the invention, the leading edges of the recesses existing on the surface of the grinding wheel form, with a generator of said grinding wheel, an angle other than zero, the advantage of such an arrangement being a lesser wear of the grinding wheel at the same time as a less brutal attack on the part to be removed.

Dans une réalisation intéressante de l'invention, les évidements de la meule sont constitués par des rainures hélicoïdales s'étendant sur toute la longueur de la meule, ce qui permet une réalisation techniquement plus facile et augmente l'effet de décrassage des évidements sur la meule.In an interesting embodiment of the invention, the recesses of the grinding wheel are constituted by helical grooves extending over the entire length of the grinding wheel, which allows a technically easier realization and increases the scouring effect of the recesses on the grinding wheel.

D'autres caractéristiques et avantages apparaîtront au cours de la description qui va suivre d'un exemple de réalisation de l'invention en liaison avec les dessins annexés, cet exemple étant donné à titre purement indicatif et nullement limitatif.Other characteristics and advantages will become apparent during the description which follows of an exemplary embodiment of the invention in conjunction with the appended drawings, this example being given for purely indicative and in no way limitative.

La figure 1 est une vue de face d'un dispositif d'usinage selon l'invention.Figure 1 is a front view of a machining device according to the invention.

La figure 2 est une vue en plan de la figure 1.Figure 2 is a plan view of Figure 1.

La figure 3 est une coupe suivant III-III de la figure 1.Figure 3 is a section along III-III of Figure 1.

La figure 4 montre, à plus grande échelle, un détail de la figure 3.FIG. 4 shows, on a larger scale, a detail of FIG. 3.

Sur les figures 1 à 3, l'appareil comprend un bâti 1 portant une meule 2 qui tourne autour d'un axe 3 solidaire de l'arbre de sortie d'un moteur 4 à deux positions, l'une assurant seulement l'entraînement en rotation de l'axe et de la meule, et l'autre leur impulsant simultanément un mouvement axial de va-et-vient (flèche 38).In FIGS. 1 to 3, the apparatus comprises a frame 1 carrying a grinding wheel 2 which rotates around an axis 3 integral with the output shaft of a motor 4 with two positions, one ensuring only the drive in rotation of the axis and the grinding wheel, and the other simultaneously impulsing them an axial back and forth movement (arrow 38).

La meule 2 a un diamètre de 15 centimètres et présente, sur l'ensemble de sa périphérie, des évidements constitués par des rainures hélicoïdales croisées d'une profondeur de 10 millimètres et disposées de telle sorte que le rapport surface active/évidements soit constant sur tout plan perpendiculaire à une génératrice de la meule passant par un point quelconque de cette génératrice. Ce rapport est, en l'occurrence, de 1, mais peut varier en se situant cependant de préférence entre 0,8 et 1,2.The grinding wheel 2 has a diameter of 15 centimeters and has, over its entire periphery, recesses formed by crossed helical grooves with a depth of 10 millimeters and arranged so that the ratio of active surface / recesses is constant over any plane perpendicular to a generatrix of the grinding wheel passing through any point of this generatrix. This ratio is, in this case, 1, but may vary, however preferably between 0.8 and 1.2.

On n'a pas dessiné de dispositif d'aspiration des copeaux et des poussières parce qu'il ne fait pas partie de l'invention. Mais il est évident que la meule 2 doit se situer à l'intérieur d'un tel système.No chip and dust extraction device has been designed because it is not part of the invention. But it is obvious that the grinding wheel 2 must be located inside such a system.

Un ensemble mobile 6, constitué de deux plateaux 7 et 8, est susceptible de coulisser sur le socle du bâti 1 grâce à deux rails 5 à rouleaux croisés coopérant avec deux rainures prévues sur le plateau 7.A mobile assembly 6, consisting of two plates 7 and 8, is capable of sliding on the base of the frame 1 thanks to two rails 5 with crossed rollers cooperating with two grooves provided on the plate 7.

Le plateau 7 possède une crosse de manoeuvre 31 solidaire de la partie mobile d'un dispositif oléo-pneumatique 32 commandé, à travers une minuterie 39, par un détecteur d'approche 33.The plate 7 has an operating stick 31 secured to the movable part of an oleopneumatic device 32 controlled, through a timer 39, by an approach detector 33.

Le plateau 8, monté rotatif sur le plateau 7 grâce à un pivot 9, possède un dispositif de blocage angulaire non représenté parce que ne faisant pas partie de l'invention. Il porte, à sa partie supérieure, deux rails 10 perpendiculaires aux rails 5, et deux supports 11 et, sur le côté, une platine 29 sur laquelle est disposé un moteur électrique 28.The plate 8, rotatably mounted on the plate 7 by means of a pivot 9, has an angular locking device which is not shown because it is not part of the invention. It carries, at its upper part, two rails 10 perpendicular to the rails 5, and two supports 11 and, on the side, a plate 29 on which an electric motor 28 is arranged.

Les rails 10 permettent à un équipage mobile 13 (voir figure 4) essentiellement constitué de deux coulisseaux 14 et 15, de se déplacer parallèlement à l'axe 3 de la meule.The rails 10 allow a mobile assembly 13 (see FIG. 4) essentially consisting of two slides 14 and 15, to move parallel to the axis 3 of the grinding wheel.

Le coulisseau 14 comprend une semelle 16 et un talon 17, la semelle 16 portant à sa surface supérieure, un rail de guidage 18, et à sa surface inférieure, deux rainures 12 correspondant aux deux rails 10 du plateau 8.The slide 14 comprises a sole 16 and a heel 17, the sole 16 carrying on its upper surface, a guide rail 18, and on its lower surface, two grooves 12 corresponding to the two rails 10 of the plate 8.

Le coulisseau 15 porte, de première part, une rainure correspondant au rail de guidage 18 du coulisseau 14, de deuxième part, une tige filetée 19 qui traverse librement le talon 17 du dit coulisseau 14 et est munie de deux écrous 20 à son extrémité, et de troisième part, un axe 21 sur lequel tournent librement deux leviers doubles 22 dont chacun porte deux roues libres 23.The slider 15 carries, on the first part, a groove corresponding to the guide rail 18 of the slider 14, on the second part, a threaded rod 19 which freely crosses the heel 17 of said slider 14 and is provided with two nuts 20 at its end, and thirdly, an axis 21 on which two double levers 22 freely rotate, each of which carries two free wheels 23.

Un ressort 24 est enfilé sur la tige filetée 19 et s'appuie, d'un côté, sur le talon 17, et de l'autre côté, sur l'arrière du coulisseau 15.A spring 24 is threaded on the threaded rod 19 and is supported, on one side, on the heel 17, and on the other side, on the rear of the slide 15.

Les supports 11 sont disposés, de façon réglable, sur un rail 36 parallèle aux rails 10 sur lesquels se déplace l'équipage mobile 13. Leur tête est constituée par une entaille asymétrique constituant un appui ouvert pour recevoir l'axe 26 et qui est formée par deux surfaces disposées en équerre l'une par rapport à l'autre, à savoir la surface supérieure horizontale du support et le côté d'une projection verticale 39.The supports 11 are arranged, in an adjustable manner, on a rail 36 parallel to the rails 10 on which the moving element 13 moves. Their head is constituted by an asymmetrical notch constituting an open support for receiving the axis 26 and which is formed by two surfaces arranged at right angles to each other, namely the upper horizontal surface of the support and the side of a vertical projection 39.

Au-dessus de chaque support, est prévue une butée mobile 35 dont le rôle sera expliqué ci-après.Above each support, a mobile stop 35 is provided, the role of which will be explained below.

Un rouleau 25 est représenté en cours d'usinage. Il est monté sur un axe 26 posé sur la tête des supports 11, les butées mobiles 35 étant disposées, par des moyens non représentés parce que ne faisant pas partie de l'invention à une certaine distance de l'axe 26, et ayant pour effet de l'empêcher d'échapper aux supports 11 tout en lui permettant un léger flottement.A roller 25 is shown during machining. It is mounted on an axis 26 placed on the head of the supports 11, the mobile stops 35 being arranged, by means not shown because they are not part of the invention at a certain distance from the axis 26, and having for effect of preventing it from escaping from the supports 11 while allowing it to float slightly.

D'autre part, l'axe 26 est solidaire par un dispositif d'emmanchement 34, d'une commande flexible 27 constituée par un ressort solidaire lui-même de l'arbre de sortie du moteur 28 porté par la platine 29 du plateau 8.On the other hand, the axis 26 is secured by a fitting device 34, to a flexible control 27 constituted by a spring itself secured to the output shaft of the motor 28 carried by the plate 29 of the plate 8 .

Dans ces conditions, le fonctionnement s'établit comme expliqué ci-après.Under these conditions, the operation is established as explained below.

L'ensemble mobile 6 étant reculé dans le sens de la flèche 37 (figure 3), on procède aux opérations suivantes :

  • on règle la position des supports 11 sur le rail 36 et celle de l'équipage mobile 13 sur les rails 10 en fonction de la répartition des masses sur l'axe 26 ;
  • on règle la position de l'ensemble mobile 6 et le détecteur d'approche 33 en fonction des cotes désirées ;
  • on règle la dureté du ressort 24 en fonction de la forme de rouleau désirée ;
  • on règle la minuterie 39 en fonction du temps pendant lequel le dispositif oléo-pneumatique va être immobilisé pour assurer le surfaçage ;
  • on fixe une extrémité de l'axe 26 dans le dispositif d'emmanchement 34 ;
  • on place le dit axe sur les supports 11 ;
  • on met en position les butées 35 ;
  • on lance le moteur 4 dans la position qui assure à la fois la rotation de la meule 2 et son mouvement axial de va-et-vient, et le moteur 28 qui commande la rotation du rouleau 25 en sens inverse de la meule 2 ;
  • on déclenche le dispositif oléo-pneumatique 32.
The mobile assembly 6 being moved back in the direction of the arrow 37 (FIG. 3), the following operations are carried out:
  • the position of the supports 11 on the rail 36 and that of the mobile assembly 13 on the rails 10 is adjusted as a function of the distribution of the masses on the axis 26;
  • the position of the mobile assembly 6 and the approach detector 33 are adjusted as a function of the desired dimensions;
  • the hardness of the spring 24 is adjusted as a function of the desired shape of the roller;
  • the timer 39 is adjusted as a function of the time during which the oleo-pneumatic device will be immobilized to ensure surfacing;
  • one end of the pin 26 is fixed in the fitting device 34;
  • said axis is placed on the supports 11;
  • the stops 35 are positioned;
  • the motor 4 is launched in the position which ensures both the rotation of the grinding wheel 2 and its axial back-and-forth movement, and the motor 28 which controls the rotation of the roller 25 in the opposite direction to the grinding wheel 2;
  • the oleopneumatic device 32 is triggered.

Celui-ci fait avancer l'ensemble 6 vers la meule 2, jusqu'à ce que le rouleau 25 arrive au contact de celle-ci.This advances the assembly 6 towards the grinding wheel 2, until the roller 25 comes into contact with the latter.

L'usinage commence, chaque grain de la meule agissant, du fait du mouvement de va-et vient dont elle est animée, sur une zone du rouleau 25 et non pas seulement sur une ligne, ce qui améliore la régularité de l'usinage. Par ailleurs, la présence des évidements sur la meule favorise l'aspiration des copeaux et poussières, assurant ainsi un décrassage permanent de la meule.The machining begins, each grain of the grinding wheel acting, due to the back and forth movement which it is animated, on an area of the roller 25 and not only on a line, which improves the regularity of the machining. In addition, the presence of the recesses on the grinding wheel favors the aspiration of shavings and dust, thus ensuring permanent cleaning of the grinding wheel.

Celle-ci exerce, sur le rouleau en cours d'usinage, une pression fonction de la poussée provoquée par le dispositif oléo-pneumatique, et cette pression tend à provoquer un fléchissemeent de l'axe 26 dont le résultat ne pourrait qu'aboutir à un profil bombé sur le rouleau 25 en fin d'usinage.This exerts, on the roller during machining, a pressure depending on the thrust caused by the oleo-pneumatic device, and this pressure tends to cause a deflection of the axis 26, the result of which could only result in a curved profile on the roller 25 at the end of machining.

C'est là qu'intervient l'action de l'équipage mobile 13 qui exerce, en fonction de sa position par rapport aux appuis sur les supports 11, de la position du coulisseau 15 par rapport à l'axe de rotation du rouleau 25, et de la dureté du ressort 24, une contre-pression dont les effets seront variables en fonction de valeur. Elle peut annuler totalement le fléchissement de l'axe 26 et permettre ainsi d'obtenir un rouleau parfaitement cylindrique. Elle peut ne l'annuler que partiellement et ainsi diminuer seulement le bombé qui aurait été obtenu sur le rouleau 25 avec la pression de la meule. Elle peut, enfin, si elle est plus importante que la pression de la meule, permettre la réalisation d'un rouleau en forme de diabolo c'est-à-dire avec un diamètre plus petit en son milieu qu'à ses extrémités.This is where the action of the moving element 13 comes into play, which, depending on its position relative to the supports on the supports 11, exerts the position of the slide 15 relative to the axis of rotation of the roller 25 , and the hardness of the spring 24, a back pressure whose effects will vary according to value. It can completely cancel the deflection of the axis 26 and thus make it possible to obtain a perfectly cylindrical roller. It may only partially cancel it and thus only reduce the crown which would have been obtained on the roller 25 with the pressure of the grinding wheel. It can, finally, if it is greater than the pressure of the grinding wheel, allow the realization of a diabolo-shaped roller, that is to say with a smaller diameter in the middle than at its ends.

Lorsque le détecteur d'approche 33 constate que l'axe de rotation du rouleau 25 est, au droit de ses appuis, à une distance de l'axe de rotation de la meule 2, égale à la somme du rayon théorique de la pièce souhaitée et du rayon de la dite meule, le dispositif oléo-pneumatique arrête l'ensemble 6, immobilisant donc les appuis du rouleau 25. A ce moment, la minuterie 39 se déclenche et l'usinage se continue dans cette position puisque le rouleau continue de tourner, ainsi que la meule 2. Si l'on veut donner une forme non cylindrique au rouleau 25, on arrête cependant la commande du mouvement de va-et-vient de la meule 2.When the approach detector 33 finds that the axis of rotation of the roller 25 is, at the right of its supports, at a distance from the axis of rotation of the grinding wheel 2, equal to the sum of the theoretical radius of the desired part and from the radius of said grinding wheel, the oleo-pneumatic device stops the assembly 6, thus immobilizing the supports of the roller 25. At this time, the timer 39 is triggered and the machining continues in this position since the roller continues to rotate, as well as the grinding wheel 2. If one wishes to give a non-cylindrical shape to the roller 25, however, the control of the reciprocating movement of the grinding wheel 2 is stopped.

Mais au fur et à mesure que l'usinage du rouleau 25 se continue, son diamètre diminue et la pression de la meule sur lui diminue donc également jusqu'à disparaître complètement. Lorsque toute pression radiale a disparu sur le rouleau en cours d'usinage, la surfaçage se réalise aux cotes et au grain désirés, quelles qu'en soient les caractéristiques élastiques.But as the machining of the roller 25 continues, its diameter decreases and the pressure of the wheel on it therefore also decreases until it disappears completely. When all radial pressure has disappeared on the roller during machining, surfacing is carried out at the desired dimensions and grain, whatever the elastic characteristics thereof.

Pour une meule de 15 centimètres de diamètre tournant à 9 000 tours/minute et une pièce en cours d'usinage de 4 centimètres de diamètre et tournant à 30 tours/minute, on compte que, pour une dureté Shore de 50, le temps pendant lequel on laissera tourner la pièce après avoir atteint la position définie se situera, de préférence, entre 10 et 30 secondes selon la finesse de grain désirée.For a 15 cm diameter grinding wheel rotating at 9,000 rpm and a workpiece in progress of 4 cm in diameter and rotating at 30 rpm, it is expected that, for a Shore hardness of 50, the time during which the workpiece will be left to rotate after reaching the defined position will preferably be between 10 and 30 seconds depending on the desired grain size.

Lorsque le temps prévu est passé, la minuterie 39 fait reculer l'ensemble mobile 6. On arrête le moteur 28. On retire le rouleau 25 et on le désaccouple de sa comande flexible.When the scheduled time has passed, the timer 39 moves the movable assembly 6 backward. The engine 28 is stopped. The roller 25 is removed and it is uncoupled from its flexible control.

Un nouveau cycle peut commencer.A new cycle can begin.

Si l'on a un rouleau tronconique à usiner, il suffit de régler d'abord la position angulaire du plateau 8 par rapport à la meule en fonction de l'angle désiré, et les opérations suivantes sont les mêmes que pour un rouleau cylindrique.If there is a frusto-conical roller to be machined, it suffices first of all to adjust the angular position of the plate 8 relative to the grinding wheel as a function of the desired angle, and the following operations are the same as for a cylindrical roller.

Il est entendu que l'on peut, sans sortir de l'invention, modifier des détails de construction et/ou de fonctionnement en vue d'obtenir les mêmes résultats.It is understood that one can, without departing from the invention, modify details of construction and / or operation in order to obtain the same results.

Ainsi, les évidements de la meule 2 pourraient être réalisés autrement que par des rainures hélicoïdales croisées. Ils pourraient, par exemple, être à l'inverse de la réalisation illustrée par les figures, les rainures devenant la surface active de la meule et les losanges devenant des évidements qui seraient alors discontinus.Thus, the recesses of the grinding wheel 2 could be made other than by crossed helical grooves. They could, for example, be the reverse of the embodiment illustrated by the figures, the grooves becoming the active surface of the grinding wheel and the diamonds becoming recesses which would then be discontinuous.

La commande flexible 27 pourrait evidemment être remplacée par un câble flexible ou même un dispositif à un ou plusieurs cardans.The flexible control 27 could obviously be replaced by a flexible cable or even a device with one or more cardan joints.

Dans le cas de pièces à usiner de plus de 40 centimètres de longueur, on pourrait prévoir soit un équipage mobile avec plus de deux groupes de roues libres d'appui, soit plusieurs équipages pour mieux répartir la contre-pression sur le rouleau en cours d'usinage.In the case of workpieces more than 40 centimeters in length, one could provide either a mobile assembly with more than two groups of free supporting wheels, or several crews to better distribute the back pressure on the roller in progress. 'machining.

Non seulement, il n'est pas exclu que l'on puisse, dans certains cas, remplacer le mouvement de va-et vient de la meule par un mouvement de va-et-vient identique de la pièce en cours d'usinage, mais il est également possible de réaliser l'invention sans mouvement relatif autre que leur rotation.Not only is it not excluded that we can, in some cases, replace the reciprocating movement of the grinding wheel by an identical reciprocating movement of the part being machined, but it is also possible to carry out the invention without relative movement other than their rotation.

Claims (13)

  1. Device having a cylindrical grinding wheel for machining and facing an elastic or semi-elastic material part by the so-called plunge method using a grinding wheel having a width at least equal to the length of said part to be machined, characterized in that it has means (32, 33, 39) able to ensure for a certain time at the end of the machining operation, the immobilization of said part (25) in a position in which its rotation spindle (26) is located, to the right of its bearing points (11), at a distance, with respect to the rotation spindle (3) of the grinding wheel (2), which is equal to the sum of the theoretical radius of the desired part and the radius of said grinding wheel.
  2. Device according to claim 1, characterized in that said means comprise an oleopneumatic device (32), controlled by an approach detector (33) and a timer (39) and acting on a moving unit (6) supporting the part (25) during machining, in order to immobilize said moving unit on information provided by said approach detector (33) for a time determined by said timer (39).
  3. Device according to any one of the preceding claims, characterized in that it incorporates means (13) able to exert on said part being machined (25) a controlled elastic thrust acting against the pressure exerted by the bearing of the part against the grinding wheel (2).
  4. Device according to claim 3, characterized in that the means (13) comprise a moving unit (13) having a group of free wheels (23) which can elastically bear on the part (25) during machining.
  5. Device according to any one of the preceding claims, characterized in that it comprises means (4) able to create a relative reciprocating movement parallel to the spindle (3) of the grinding wheel (2) between the latter and the part (25) being machined.
  6. Device according to claim 5, characterized in that the said means (4) cause an axial reciprocating movement of the grinding wheel (2).
  7. Device according to any one of the preceding claims, characterized in that it has means (27) permitting, during the rough machining period, a slight wobble of the rotation spindle (26) of the part (25) being machined.
  8. Device according to claim 7, characterized in that the said means (27) comprise a flexible control 927) between the part being machined and the motor means (28) rotating the latter.
  9. Device according to any one of the preceding claims, characterized in that it has two open supports (11) constituted by two surfaces at right angles, each receiving one end of the spindle (26) of the part (25) being machined and that two abutments (25) are provided to the right of said supports to prevent said spindle (26) escaping therefrom during the wobbling suffered by the part (25) during its machining.
  10. Device according to any one of the preceding claims, characterized in that the grinding wheel (2) has, over its entire periphery, recesses positioned in such a way as to bring about with the active surface portions, an alternation such that the active surface/recess ratio is constant over the entire plane perpendicular to a generatrix of the grinding wheel and passing through a random point of said generatrix.
  11. Device according to claim 10, characterized in that the active surface/recess ratio is between 0.8 and 1.2.
  12. Device according to claim 11, characterized in that the leading edges of the recesses on the surface of the grinding wheel form, with a generatrix of said grinding wheel, an angle differing from 0°.
  13. Device according to claim 12, characterized in that the recesses of the grinding wheel are constituted by helical grooves.
EP92901499A 1990-12-05 1991-12-05 Device for machining and facing resilient materials Expired - Lifetime EP0560888B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9015220A FR2670150B1 (en) 1990-12-05 1990-12-05 DEVICE FOR MACHINING AND SURFACING ELASTIC MATERIALS.
FR9015220 1990-12-05
PCT/FR1991/000972 WO1992010331A1 (en) 1990-12-05 1991-12-05 Device for machining and facing resilient materials

Publications (2)

Publication Number Publication Date
EP0560888A1 EP0560888A1 (en) 1993-09-22
EP0560888B1 true EP0560888B1 (en) 1994-07-06

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EP92901499A Expired - Lifetime EP0560888B1 (en) 1990-12-05 1991-12-05 Device for machining and facing resilient materials

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US (1) US5443411A (en)
EP (1) EP0560888B1 (en)
JP (1) JPH06505924A (en)
AT (1) ATE108114T1 (en)
AU (1) AU9103091A (en)
DE (1) DE69102772T2 (en)
ES (1) ES2059210T3 (en)
FR (1) FR2670150B1 (en)
WO (1) WO1992010331A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK0806260T3 (en) * 1996-05-09 2002-03-25 Boettcher Gmbh & Co Felix Method of removing used elastomeric coatings from rollers and device for carrying them out
DE102012223276B4 (en) * 2012-12-14 2015-09-03 Erwin Junker Grinding Technology A.S. METHOD AND CIRCULAR GRINDING MACHINE FOR TIP-FREE CIRCULAR GRINDING

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Publication number Priority date Publication date Assignee Title
DE567711C (en) * 1933-01-07 Hans Thoma Dr Ing Hydraulic bezel
US1575968A (en) * 1921-07-20 1926-03-09 Bryant William Le Roy Grinding machine
US1709671A (en) * 1927-05-31 1929-04-16 Cincinnati Grinders Inc Grinding machinery
US3324607A (en) * 1964-08-13 1967-06-13 Super Cut Rotary grinding tool with interrupted abrasive helicoid
US3427755A (en) * 1965-12-20 1969-02-18 Brown & Sharpe Mfg Counter-force motivated back rest
DE1629236A1 (en) * 1966-11-26 1971-01-28 Peter Wolters Kratzenfabrik Un Process for grinding elastomers and similar materials
JPS4833062B1 (en) * 1970-12-15 1973-10-11
JPS5518383A (en) * 1978-07-28 1980-02-08 Toyoda Mach Works Ltd Numerical controller for controlling grinding
US4404772A (en) * 1981-09-14 1983-09-20 Litton Industrial Products, Inc. Cylindrical grinding machine
IT1145094B (en) * 1981-09-16 1986-11-05 Martinson Srl SELF-CENTERING BEZEL
US4663892A (en) * 1982-11-30 1987-05-12 Energy Adaptive Grinding, Inc. Force-controlled steadyrest system
CH664717A5 (en) * 1984-11-03 1988-03-31 Maag Zahnraeder & Maschinen Ag METHOD AND DEVICE FOR PRODUCING EVOLVENT-SHAPED TOOTHED FLANGES.
SE8504090D0 (en) * 1985-09-03 1985-09-03 Welin Berger Guy SELF-CENTERING STUD DOLLS
JPS62107949A (en) * 1985-11-04 1987-05-19 Toyoda Mach Works Ltd Grinder equipped with deflection suppressing device
JPS62181802A (en) * 1986-02-03 1987-08-10 Matsumoto Masamichi Grinder
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JP2619497B2 (en) * 1988-09-29 1997-06-11 豊田工機株式会社 Grinding device with end face measuring device
US5148827A (en) * 1991-11-26 1992-09-22 Delaware Capital Formation, Inc. Air-oil full hydraulic reservoir tank

Also Published As

Publication number Publication date
FR2670150A1 (en) 1992-06-12
ATE108114T1 (en) 1994-07-15
DE69102772T2 (en) 1995-01-12
AU9103091A (en) 1992-07-08
US5443411A (en) 1995-08-22
FR2670150B1 (en) 1995-04-07
DE69102772D1 (en) 1994-08-11
ES2059210T3 (en) 1994-11-01
WO1992010331A1 (en) 1992-06-25
EP0560888A1 (en) 1993-09-22
JPH06505924A (en) 1994-07-07

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