EP1129818A1 - Method for superfinishing workpieces having cylindrical surfaces - Google Patents

Method for superfinishing workpieces having cylindrical surfaces Download PDF

Info

Publication number
EP1129818A1
EP1129818A1 EP01400508A EP01400508A EP1129818A1 EP 1129818 A1 EP1129818 A1 EP 1129818A1 EP 01400508 A EP01400508 A EP 01400508A EP 01400508 A EP01400508 A EP 01400508A EP 1129818 A1 EP1129818 A1 EP 1129818A1
Authority
EP
European Patent Office
Prior art keywords
wheel
abrasive
axis
cylindrical surface
machined
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP01400508A
Other languages
German (de)
French (fr)
Inventor
Richard Bonachera
Raymond Millot
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Procedes et Machines Speciales Ste
Original Assignee
Procedes et Machines Speciales Ste
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Procedes et Machines Speciales Ste filed Critical Procedes et Machines Speciales Ste
Publication of EP1129818A1 publication Critical patent/EP1129818A1/en
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
    • B24B19/02—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding grooves, e.g. on shafts, in casings, in tubes, homokinetic joint elements
    • B24B19/028—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding grooves, e.g. on shafts, in casings, in tubes, homokinetic joint elements for microgrooves or oil spots
    • 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
    • B24B21/02—Machines or devices using grinding or polishing belts; Accessories therefor for grinding rotationally symmetrical surfaces
    • 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
    • B24B5/02—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work
    • B24B5/04—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work for grinding cylindrical surfaces externally
    • 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
    • B24B5/38—Single-purpose machines or devices for externally grinding travelling elongated stock, e.g. wire

Definitions

  • the present invention relates to a superfinishing process of the cylindrical surface of parts intended to be mounted in circular guides and to be animated along their axis with a movement of translation with respect to said guides.
  • Such a part can be, by way of illustrative example, a rack of motor vehicle steering.
  • the cylindrical surfaces of such parts are rectified before being, if necessary, subjected to a super-finishing operation, for example by grooming. All these operations machining performed with rotation on the parts of the scratches or striations more or less fine, circular or helical, the orientation of these scratches or streaks being conditioned by the relative movements of the workpiece and the tool being machined.
  • Such a "longitudinal superfinish” results in remove circular or helical streaks or scratches from the rectification or classic superfinishing in favor of streaks or scratches longitudinal which, due to their orientation parallel to the axis of the part, cause much less vibration, friction and noise when the part is then animated by an axial translational movement compared to its guides.
  • the super-finishing longitudinal is effected by direct contact of a flexible abrasive wheel with the surface to be machined, which causes wear and fouling relatively fast abrasive wheel.
  • the present invention relates to a method of "super-finishing longitudinal "of the cylindrical surface of parts, which allows a faster machining of parts and which can be largely automated.
  • the invention further relates to a method of "superfinishing longitudinal "to reduce the propensity to wear and fouling which affects the known process.
  • the method according to the invention of surface superfinishing cylindrical parts intended to be mounted in guides and to be animated along their axis with a translational movement relative to said guides consists in placing an abrasive application wheel of so that its axis is oriented perpendicular to the axis of the part and that its lateral surface is in abutment against said cylindrical surface, drive said wheel in rotation about its axis and to animate said part and / or said movement wheel such as the cylindrical surface of the part either machined longitudinally in its entirety by abrasive, and move said wheel or said parts along the axis of the latter.
  • the wheel and / or the workpiece are animated simultaneously a translational movement along the axis of the part and a movement of rotation about the workpiece axis at speeds such as said cylindrical surface of the part is machined longitudinally according to a helical trace, whose successive turns overlap.
  • the cylindrical surface of a part can be machined completely in a single pass, so in an angry operation at automate.
  • abrasive a wheel of which at least the external lateral surface is flexible.
  • It may preferably be a wheel whose lateral surface outer has a circumferential groove having an arcuate profile of circle of radius substantially equal to the radius of the cylindrical surface of the workpiece.
  • abrasive by passing an abrasive strip over the surface lateral of said wheel and animating said strip, by the rotation of said wheel, continuously advancing during machining.
  • said wheel is pressed with a controlled force, constant, against the cylindrical surface to be machined.
  • a part 1 of which only a part is shown in Figure 1 has a cylindrical surface which has been machined in the usual way by rectification and, if necessary, by classic superfinish, operations which allow the surface of streaks or stripes 2 circular or helical, more or less fine.
  • a "longitudinal superfinishing" whose purpose is replace circular or helical 2 scratches with scratches longitudinal 3 (see figure 1).
  • an abrasive application wheel 4 is used, the axis of rotation 5 is perpendicular to the axis of rotation 6 of the part 1 and which is arranged in relation to the part 1 so that its lateral surface or circumferential surface 7 is in abutment against the surface cylindrical part 1.
  • the lateral surface 7 of the wheel is in direct contact with the cylindrical surface of the part 1.
  • the wheel 4 is therefore an abrasive wheel.
  • the lateral surface 7 of the wheel 4 has a circumferential groove 8 with a profile in an arc of a radius adapted to the radius of the room 1.
  • the wheel 4 is flexible, at least in its outer part. From this done, when the wheel 4 is pressed with a predetermined force against the part 1, it deforms at the interface with part 1, which establishes, between the wheel 4 and the part 1, a contact over a length 1 parallel to axis 6 of part 1 (see Figure 1).
  • the wheel 4, rotated in the direction of the arrow 9, is driven in a translational movement in the direction of arrow 10 and the part 1, which is immobilized in translation, is rotated around its axis 6 in the direction of arrow 11, at speeds such that the abrasive application wheel 4 produces, on the cylindrical surface of the piece 1, a helical trace 12 of longitudinal streaks or stripes 3, of a width corresponding to the length l, the successive turns of the overlapping trace 12 (over part of the width "l" of the trace).
  • Figures 3 and 4 show an embodiment of a machine for implementing the method according to the invention.
  • a part 1 to be machined, consisting in the example represented by a steering rack mounted between two tips 13 and 14, and rotated about its axis (arrow 11). There is also an abrasive application wheel 4 driven in rotation (arrow 9) around its axis 5 oriented perpendicular to the axis of rotation of the part 1.
  • the training of the wheel 4 is effected by a motor-reduction unit 15, the wheel 4 being mounted directly at the output of the reducer.
  • the motor-reduction unit 15 is pivotally mounted about an axis 16 perpendicular to the axis of the part 1 on a carriage 17 movable in translation parallel to the axis of the part 1 on a guide path 18, the carriage 17 being stable on the path of guide 18 (arrow 10) under the action of a drive means, not shown in detail, for example a screw system 19.
  • the wheel 4 here also includes in its outer lateral surface 7 a circumferential groove 8, the radius of curvature is adapted to the radius of part 1, i.e. is substantially equal to this radius.
  • the abrasive machining of the surface cylindrical part 1 can be done as according to Figures 1 and 2 directly by the wheel 4 constituted in this case by an abrasive wheel, of preferably a flexible abrasive wheel as marketed by the 3M France company under the brand name "3M Scotch Brite". This is in the occurrence of a wheel made of non-woven synthetic fibers with grains more or less fine abrasives depending on the desired finish.
  • the wheel 4 can be a non-abrasive wheel, preferably at least the lateral surface exterior is flexible. It can be, for example, an elastomer wheel as marketed under the COURBHANE brand by the Company COURBIS SYNTHESE of 26100 ROMANS SUR ISERE.
  • the circumferential groove 8 provided in the lateral surface 7 of the wheel 4 ensures in this case a flexible application of the abrasive belt 22 running on the surface 7 of the rotating wheel 4, the strip being, under the bearing pressure, depending on its duration of use, elastically deformed more and more deeply in said groove 8 in the region of contact with part 1, increasingly enveloping the surface cylindrical of the part. Compensation for increased flexibility that the abrasive belt undergoes depending on its duration of use may do, for example, at the level of the control system 20 which can in this case be advantageously a stop system subject to time use of the abrasive belt, for example the number of pieces already machined by the same abrasive belt.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)

Abstract

The superfinishing process of the cylindrical surface of a part (1) consists in placing an abrasive application wheel (4) so that its axis (5) is perpendicular to the part's axis (6). The wheel's lateral surface (7) is then supported against the cylindrical surface and the wheel is rotated and translated (10) along the part's axis simultaneously with the part's rotation (11) at speeds such that the entire cylindrical surface is machined longitudinally (3) by the abrasive along a helical path whose successive coils (12) overlap.

Description

La présente invention se rapporte à un procédé de superfinition de la surface cylindrique de pièces destinées à être montées dans des guides circulaires et à être animées suivant leur axe d'un mouvement de translation par rapport auxdits guides.The present invention relates to a superfinishing process of the cylindrical surface of parts intended to be mounted in circular guides and to be animated along their axis with a movement of translation with respect to said guides.

Il existe de nombreuses pièces de machines animées d'un mouvement de translation, ces pièces étant montées au niveau de leurs surfaces cylindriques dans des guides (paliers de translation) circulaires. Une telle pièce peut être, à titre d'exemple illustratif, une crémaillère de direction de véhicule automobile.There are many parts of machines with a translational movement, these parts being mounted at their cylindrical surfaces in circular guides (translation bearings). Such a part can be, by way of illustrative example, a rack of motor vehicle steering.

D'une manière générale, les surfaces cylindriques de telles pièces sont rectifiées avant d'être, le cas échéant, soumises à une opération de superfinition, par exemple par toilage. Toutes ces opérations d'usinage effectuées avec rotation sur les pièces des rayures ou stries plus ou moins fines, circulaires ou en hélice, l'orientation de ces rayures ou stries étant conditionnée par les mouvements relatifs de la pièce et de l'outil en cours d'usinage.Generally speaking, the cylindrical surfaces of such parts are rectified before being, if necessary, subjected to a super-finishing operation, for example by grooming. All these operations machining performed with rotation on the parts of the scratches or striations more or less fine, circular or helical, the orientation of these scratches or streaks being conditioned by the relative movements of the workpiece and the tool being machined.

Or, ces stries ou rayures, même lorsqu'elles sont très fines, provoquent des vibrations, des frottements et des bruits indésirables lorsque les pièces sont animées d'un mouvement de translation axial par rapport à leurs guides.Now, these streaks or stripes, even when they are very fine, cause unwanted vibration, friction and noise when the parts are driven in an axial translational movement by compared to their guides.

Pour remédier à cet inconvénient, c'est-à-dire supprimer ces stries ou rayures circulaires ou hélicoïdales, il a déjà été proposé de soumettre la surface cylindrique de telles pièces à une "superfinition longitudinale" consistant à l'usiner par la surface latérale d'une roue abrasive entraínée en rotation autour de son axe orienté perpendiculairement à l'axe de la pièce, et par déplacement de ladite roue ou de la pièce en translation suivant l'axe de cette dernière.To remedy this drawback, i.e. remove these circular or helical streaks or stripes, it has already been proposed to subject the cylindrical surface of such parts to a "super-finish" longitudinal "consisting of machining it by the lateral surface of a wheel abrasive rotated around its oriented axis perpendicular to the axis of the part, and by displacement of said wheel or of the part in translation along the axis of the latter.

Une telle "superfinition longitudinale" a pour résultat de supprimer les stries ou rayures circulaires ou hélicoïdales provenant de la rectification ou de la superfinition classique au profit de stries ou rayures longitudinales qui, du fait de leur orientation parallèlement à l'axe de la pièce, provoquent beaucoup moins de vibrations, frottements et bruits lorsque la pièce est ensuite animée d'un mouvement de translation axiale par rapport à ses guides.Such a "longitudinal superfinish" results in remove circular or helical streaks or scratches from the rectification or classic superfinishing in favor of streaks or scratches longitudinal which, due to their orientation parallel to the axis of the part, cause much less vibration, friction and noise when the part is then animated by an axial translational movement compared to its guides.

Suivant le procédé de superfinition longitudinale utilisé jusqu'à présent, on effectue sur la surface cylindrique à usiner plusieurs passes successives consistant chacune à usiner un segment de surface cylindrique sur la pièce immobilisée en rotation, la pièce étant décalée angulairement entre deux passes successives jusqu'à ce que la totalité de la surface cylindrique soit usinée par plusieurs passes axiales successives.According to the longitudinal superfinishing process used up to present, several passes are made on the cylindrical surface to be machined successive each consisting of machining a surface segment cylindrical on the part immobilized in rotation, the part being offset angularly between two successive passes until all of the cylindrical surface is machined by several axial passes successive.

Ce procédé connu est relativement lent et difficile à automatiser.This known process is relatively slow and difficult to automate.

De plus, suivant ce procédé connu, la superfinition longitudinale s'effectue par contact direct d'une roue abrasive souple avec la surface à usiner, ce qui entraíne une usure et un encrassement relativement rapides de la roue abrasive.In addition, according to this known process, the super-finishing longitudinal is effected by direct contact of a flexible abrasive wheel with the surface to be machined, which causes wear and fouling relatively fast abrasive wheel.

La présente invention vise un procédé de "superfinition longitudinale" de la surface cylindrique de pièces, qui permette un usinage plus rapide des pièces et qui puisse être largement automatisé.The present invention relates to a method of "super-finishing longitudinal "of the cylindrical surface of parts, which allows a faster machining of parts and which can be largely automated.

L'invention vise par ailleurs un procédé de "superfinition longitudinale" permettant de réduire la propension à l'usure et à l'encrassement dont est affecté le procédé connu.The invention further relates to a method of "superfinishing longitudinal "to reduce the propensity to wear and fouling which affects the known process.

Le procédé conforme à l'invention de superfinition de la surface cylindrique de pièces destinées à être montées dans des guides et à être animées suivant leur axe d'un mouvement de translation par rapport auxdits guides, consiste à placer une roue d'application d'abrasif de manière que son axe soit orienté perpendiculairement à l'axe de la pièce et que sa surface latérale soit en appui contre ladite surface cylindrique, à entraíner ladite roue en rotation autour de son axe et à animer ladite pièce et/ou ladite roue de mouvements tels que la surface cylindrique de la pièce soit usinée longitudinalement dans son intégralité par abrasif, et à déplacer ladite roue ou lesdites pièces suivant l'axe de cette dernière. Selon l'invention, on anime la roue et/ou la pièce à usiner simultanément d'un mouvement de translation suivant l'axe de la pièce et d'un mouvement de rotation autour de l'axe de la pièce à des vitesses telles que ladite surface cylindrique de la pièce soit usinée longitudinalement suivant une trace en hélice, dont les spires successives se chevauchent.The method according to the invention of surface superfinishing cylindrical parts intended to be mounted in guides and to be animated along their axis with a translational movement relative to said guides, consists in placing an abrasive application wheel of so that its axis is oriented perpendicular to the axis of the part and that its lateral surface is in abutment against said cylindrical surface, drive said wheel in rotation about its axis and to animate said part and / or said movement wheel such as the cylindrical surface of the part either machined longitudinally in its entirety by abrasive, and move said wheel or said parts along the axis of the latter. According to the invention, the wheel and / or the workpiece are animated simultaneously a translational movement along the axis of the part and a movement of rotation about the workpiece axis at speeds such as said cylindrical surface of the part is machined longitudinally according to a helical trace, whose successive turns overlap.

Ainsi, la surface cylindrique d'une pièce peut être usinée intégralement en une seule passe, donc en une opération fâche à automatiser.Thus, the cylindrical surface of a part can be machined completely in a single pass, so in an angry operation at automate.

Du point de vue mise en oeuvre du procédé, il est plus simple d'animer la pièce à usiner d'un mouvement de rotation autour de son axe et d'animer la roue d'application d'abrasif d'un mouvement de translation suivant l'axe de la pièce.From the point of view of implementation of the method, it is simpler animate the workpiece with a rotational movement around its axis and animate the abrasive application wheel with a translational movement along the axis of the part.

De préférence, on utilise, suivant l'invention, pour appliquer l'abrasif, une roue dont au moins la surface latérale extérieure est souple.Preferably, according to the invention, use is made to apply the abrasive, a wheel of which at least the external lateral surface is flexible.

Il peut de préférence s'agir d'une roue dont la surface latérale extérieure comporte une gorge circonférentielle ayant un profil en arc de cercle de rayon sensiblement égal au rayon de la surface cylindrique de la pièce à usiner.It may preferably be a wheel whose lateral surface outer has a circumferential groove having an arcuate profile of circle of radius substantially equal to the radius of the cylindrical surface of the workpiece.

Suivant un mode de réalisation préféré de l'invention, on applique l'abrasif en faisant passer une bande abrasive sur la surface latérale de ladite roue et on anime ladite bande, par la rotation de ladite roue, d'un mouvement d'avancement continu pendant l'usinage.According to a preferred embodiment of the invention, it is applies the abrasive by passing an abrasive strip over the surface lateral of said wheel and animating said strip, by the rotation of said wheel, continuously advancing during machining.

Bien que l'on puisse, dans le cadre de l'invention, utiliser une bande abrasive de longueur finie, que l'on déroule d'une bobine débitrice pour la réenrouler sur une bobine réceptrice, il est avantageux d'utiliser une bande abrasive sans fin.Although it is possible, within the framework of the invention, to use a abrasive belt of finished length, which is unwound from a supply reel to rewind it on a take-up reel, it is advantageous to use an endless abrasive belt.

De préférence, on appuie ladite roue avec une force contrôlée, constante, contre la surface cylindrique à usiner.Preferably, said wheel is pressed with a controlled force, constant, against the cylindrical surface to be machined.

En se référant aux dessins schématiques annexés, on va décrire ci-après plus en détail le procédé d'usinage conforme à l'invention ainsi qu'à titre d'exemple une machine pour la mise en oeuvre de ce procédé; sur les dessins :

  • les figures 1 et 2 représentent schématiquement, une vue latérale et une vue en bout d'une pièce cylindrique au cours de son usinage, conforme à l'invention, par "superfinition longitudinale";
  • les figures 3 et 4 sont des vues correspondantes d'une machine pour la mise en oeuvre de ce procédé.
Referring to the appended schematic drawings, a description will be given below in more detail of the machining process according to the invention, and by way of example a machine for carrying out this process; on the drawings:
  • Figures 1 and 2 schematically show a side view and an end view of a cylindrical part during its machining, according to the invention, by "longitudinal superfinishing";
  • Figures 3 and 4 are corresponding views of a machine for the implementation of this method.

Suivant les figures 1 et 2, une pièce 1 dont seule une partie est représentée sur la figure 1, comporte une surface cylindrique qui a été usinée de façon usuelle par rectification et, le cas échéant, par superfinition classique, opérations qui laissent subsister sur la surface des stries ou rayures 2 circulaires ou hélicoïdales, plus ou moins fines. Pour éliminer ces rayures 2 circulaires ou hélicoïdales, on soumet la surface cylindrique de la pièce 1 à une "superfinition longitudinale" dont le but est de remplacer les rayures 2 circulaires ou hélicoïdales par des rayures longitudinales 3 (voir figure 1).According to Figures 1 and 2, a part 1 of which only a part is shown in Figure 1, has a cylindrical surface which has been machined in the usual way by rectification and, if necessary, by classic superfinish, operations which allow the surface of streaks or stripes 2 circular or helical, more or less fine. For eliminate these circular or helical 2 scratches, subject the surface cylindrical of the part 1 to a "longitudinal superfinishing" whose purpose is replace circular or helical 2 scratches with scratches longitudinal 3 (see figure 1).

A cet effet, on utilise une roue d'application d'abrasif 4 dont l'axe de rotation 5 est perpendiculaire à l'axe de rotation 6 de la pièce 1 et qui est disposée par rapport à la pièce 1 de manière que sa surface latérale ou surface circonférentielle 7 se trouve en appui contre la surface cylindrique de la pièce 1.For this purpose, an abrasive application wheel 4 is used, the axis of rotation 5 is perpendicular to the axis of rotation 6 of the part 1 and which is arranged in relation to the part 1 so that its lateral surface or circumferential surface 7 is in abutment against the surface cylindrical part 1.

Dans cet exemple, la surface latérale 7 de la roue se trouve en contact direct avec la surface cylindrique de la pièce 1. La roua 4 est donc une roue abrasive.In this example, the lateral surface 7 of the wheel is in direct contact with the cylindrical surface of the part 1. The wheel 4 is therefore an abrasive wheel.

Comme le montre la figure 2, la surface latérale 7 de la roue 4 comporte une gorge circonférentielle 8 à profil en arc de cercle de rayon adapté au rayon de la pièce 1.As shown in FIG. 2, the lateral surface 7 of the wheel 4 has a circumferential groove 8 with a profile in an arc of a radius adapted to the radius of the room 1.

La roue 4 est souple, au moins dans sa partie extérieure. De ce fait, lorsque la roue 4 est appuyée avec une force prédéterminée contre la pièce 1, elle se déforme au niveau de l'interface avec la pièce 1, ce qui établit, entre la roue 4 et la pièce 1, un contact sur une longueur 1 parallèlement à l'axe 6 de la pièce 1 (voir figure 1).The wheel 4 is flexible, at least in its outer part. From this done, when the wheel 4 is pressed with a predetermined force against the part 1, it deforms at the interface with part 1, which establishes, between the wheel 4 and the part 1, a contact over a length 1 parallel to axis 6 of part 1 (see Figure 1).

La roue 4, entraínée en rotation dans le sens de la flèche 9, est animée d'un mouvement de translation dans le sens de la flèche 10 et la pièce 1, qui est immobilisée en translation, est entraínée en rotation autour de son axe 6 dans le sens de la flèche 11, à des vitesses telles que la roue d'application d'abrasif 4 produise, sur la surface cylindrique de la pièce 1, une trace hélicoïdale 12 de stries ou rayures longitudinales 3, d'une largeur correspondant à la longueur l, les spires successives de la trace 12 se chevauchant (sur une partie de la largeur "l" de la trace).The wheel 4, rotated in the direction of the arrow 9, is driven in a translational movement in the direction of arrow 10 and the part 1, which is immobilized in translation, is rotated around its axis 6 in the direction of arrow 11, at speeds such that the abrasive application wheel 4 produces, on the cylindrical surface of the piece 1, a helical trace 12 of longitudinal streaks or stripes 3, of a width corresponding to the length l, the successive turns of the overlapping trace 12 (over part of the width "l" of the trace).

Les figures 3 et 4 représentent un exemple de réalisation d'une machine pour la mise en oeuvre du procédé conforme à l'invention.Figures 3 and 4 show an embodiment of a machine for implementing the method according to the invention.

On retrouve sur les figures 3 et 4 une pièce 1 à usiner, constituée dans l'exemple représenté par une crémaillère de direction montée entre deux pointes 13 et 14, et entraínée en rotation autour de son axe (flèche 11). On retrouve également une roue d'application d'abrasif 4 entraínée en rotation (flèche 9) autour de son axe 5 orienté perpendiculairement à l'axe de rotation de la pièce 1.We find in Figures 3 and 4 a part 1 to be machined, consisting in the example represented by a steering rack mounted between two tips 13 and 14, and rotated about its axis (arrow 11). There is also an abrasive application wheel 4 driven in rotation (arrow 9) around its axis 5 oriented perpendicular to the axis of rotation of the part 1.

On reconnaít en particulier sur la figure 4 que l'entraínement de la roue 4 s'effectue par un ensemble moteur-réducteur 15, la roue 4 étant montée directement en sortie du réducteur. L'ensemble moteur-réducteur 15 est monté pivotant autour d'un axe 16 perpendiculaire à l'axe de la pièce 1 sur un chariot 17 mobile en translation parallèlement à l'axe de la pièce 1 sur un chemin de guidage 18, le chariot 17 étant stable sur le chemin de guidage 18 (flèche 10) sous l'action d'un moyen d'entraínement, non représenté en détail, par exemple un système à vis 19.We recognize in particular in Figure 4 that the training of the wheel 4 is effected by a motor-reduction unit 15, the wheel 4 being mounted directly at the output of the reducer. The motor-reduction unit 15 is pivotally mounted about an axis 16 perpendicular to the axis of the part 1 on a carriage 17 movable in translation parallel to the axis of the part 1 on a guide path 18, the carriage 17 being stable on the path of guide 18 (arrow 10) under the action of a drive means, not shown in detail, for example a screw system 19.

Un dispositif de contrôle 20 représenté schématiquement sur la figure 3, par exemple un système de butée à vis ou un système d'appui à vérin, permet de contrôler la pression d'application de l'abrasif contre la pièce 1, par pivotement de l'ensemble 15-4 autour de l'axe 16 (flèche 20).A control device 20 shown diagrammatically on the Figure 3, for example a screw stop system or a support system cylinder, allows to control the pressure of application of the abrasive against the part 1, by pivoting of the assembly 15-4 around the axis 16 (arrow 20).

On reconnaít sur la figure 4 que la roue 4 comporte ici également dans sa surface latérale extérieure 7 une gorge circonférentielle 8 dont le rayon de courbure est adapté au rayon de la pièce 1, c'est-à-dire est sensiblement égal à ce rayon.We recognize in Figure 4 that the wheel 4 here also includes in its outer lateral surface 7 a circumferential groove 8, the radius of curvature is adapted to the radius of part 1, i.e. is substantially equal to this radius.

Dans le cadre de l'invention, l'usinage par abrasif de la surface cylindrique de la pièce 1 peut se faire comme suivant les figures 1 et 2 directement par la roue 4 constituée dans ce cas par une roue abrasive, de préférence une roue abrasive souple telle que commercialisée par la Société 3M France sous la marque "3M Scotch Brite". Il s'agit en l'occurence d'une roue en fibres synthétiques non tissées avec des grains abrasifs plus ou moins fins selon le fini recherché.In the context of the invention, the abrasive machining of the surface cylindrical part 1 can be done as according to Figures 1 and 2 directly by the wheel 4 constituted in this case by an abrasive wheel, of preferably a flexible abrasive wheel as marketed by the 3M France company under the brand name "3M Scotch Brite". This is in the occurrence of a wheel made of non-woven synthetic fibers with grains more or less fine abrasives depending on the desired finish.

Toutefois, pour obtenir une plus grande régularité d'usinage, pour réduire la propension à l'usure et à l'encrassement d'une telle roue abrasive en contact direct avec la surface à usiner, et pour permettre un usinage sans problémes également de pièces dont la surface cylindrique est interrompue par endroits, par exemple par une partie dentée comme c'est le cas sur ,une crémaillère de direction, il s'est avéré préférable d'utiliser une bande abrasive que l'on fait passer sur la roue 4 pour l'appliquer contre la surface cylindrique de la pièce 1, la roue 4 servant uniquement de roue d'appui (et d'entraínement).However, to obtain greater regularity in machining, to reduce the propensity for wear and fouling of such a wheel abrasive in direct contact with the surface to be machined, and to allow a also trouble-free machining of parts with a cylindrical surface is interrupted in places, for example by a toothed part like this is the case on a steering rack, it turned out to be preferable use an abrasive band which is passed over the wheel 4 to apply it against the cylindrical surface of the part 1, the wheel 4 serving only support wheel (and drive).

Sur les figures 3 et 4, on reconnaít une telle bande abrasive 22 qui est ici une bande sans fin maintenue sous tension par un système de renvoi et de tension 23.Figures 3 and 4, we recognize such an abrasive belt 22 which here is an endless belt kept under tension by a return system and tension 23.

Des résultats particulièrement remarquables ont été obtenus par l'utilisation d'une bande à "abrasifs structurés" (micro-structures abrasives pyramidales), telle que commercialisée par la Société 3M France sous la marque "3M Trizact".Particularly remarkable results have been obtained by the use of a strip with "structured abrasives" (micro-structures abrasive pyramidales), as marketed by 3M France under the brand name "3M Trizact".

En cas d'utilisation d'une bande abrasive 22, la roue 4 peut être une roue non abrasive dont, de préférence, au moins la surface latérale extérieure est souple. Il peut s'agir, par exemple, d'une roue en élastomère telle que commercialisée sous la marque COURBHANE par la Société COURBIS SYNTHESE de 26100 ROMANS SUR ISERE.If an abrasive belt 22 is used, the wheel 4 can be a non-abrasive wheel, preferably at least the lateral surface exterior is flexible. It can be, for example, an elastomer wheel as marketed under the COURBHANE brand by the Company COURBIS SYNTHESE of 26100 ROMANS SUR ISERE.

La gorge circonférentielle 8 prévue dans la surface latérale 7 de la roue 4 assure dans ce cas une application souple de la bande abrasive 22 défilant sur la surface 7 de la roue 4 en rotation, la bande étant, sous la pression d'appui, en fonction de sa durée d'utilisation, élastiquement déformée de plus en plus profondément dans ladite gorge 8 dans la zone de contact avec la pièce 1, en enveloppant de plus en plus la surface cylindrique de la pièce. Une compensation de l'augmentation de souplesse que la bande abrasive subit en fonction de sa durée d'utilisation peut se faire, par exemple, au niveau du système de contrôle 20 qui peut dans ce cas être avantageusement un système de butée asservi à la durée d'utilisation de la bande abrasive, par exemple au nombre de pièces déja usinées par la même bande abrasive.The circumferential groove 8 provided in the lateral surface 7 of the wheel 4 ensures in this case a flexible application of the abrasive belt 22 running on the surface 7 of the rotating wheel 4, the strip being, under the bearing pressure, depending on its duration of use, elastically deformed more and more deeply in said groove 8 in the region of contact with part 1, increasingly enveloping the surface cylindrical of the part. Compensation for increased flexibility that the abrasive belt undergoes depending on its duration of use may do, for example, at the level of the control system 20 which can in this case be advantageously a stop system subject to time use of the abrasive belt, for example the number of pieces already machined by the same abrasive belt.

Cette déformation croissante que la bande abrasive sans fin à défilement continu subit en fonction de sa durée d'utilisation présente, dans le cadre de son utilisation conforme à l'invention en combinaison avec une roue d'application d'abrasif à gorge circonférentielle, l'avantage supplémentaire que la pièce se trouve toujours usinée par une portion de la bande comportant de l'abrasif "neuf", à savoir au départ par la portion du milieu de la largeur de la bande et ensuite par deux portions latérales qui se rapprochent progressivement des deux bords latéraux opposés de la bande au fur et à mesure que la déformation de cette dernière entre la pièce à usiner et le roue d'application, donc la profondeur d'enfoncement de la bande dans la gorge circonférentielle de la roue, croít en raison de l'augmentation de la souplesse de la bande abrasive.This increasing deformation that the endless abrasive belt continuous scrolling undergoes as a function of its present duration of use, in the context of its use according to the invention in combination with a circumferential groove abrasive application wheel, the advantage additional that the part is always machined by a portion of the strip containing "new" abrasive, namely at the start by the portion of the middle of the width of the strip and then by two side portions which gradually approach the two opposite lateral edges of the band as the deformation of the latter between the part to be machined and the application wheel, so the driving depth of the band in the circumferential groove of the wheel, increases due to increasing the flexibility of the abrasive belt.

Il convient de noter que le mode de réalisation représenté et décrit n'a été donné qu'à titre d'exemple illustratif et non limitatif et que de nombreuses modifications et variantes sont possibles dans le cadre de l'invention.It should be noted that the embodiment shown and described has been given by way of illustrative and non-limiting example and only many modifications and variants are possible within the framework of the invention.

Cela concerne en particulier la manière suivant laquelle sont produits les deux mouvements relatifs de la roue d'application d'abrasif 4 et de la pièce à usiner 1, c'est-à-dire le mouvement de translation suivant l'axe de la pièce (au niveau de la roue 4) et le mouvement de rotation autour de l'axe de la pièce (au niveau de la pièce 1 dans l'exemple illustré).This concerns in particular the manner in which produces the two relative movements of the abrasive application wheel 4 and the workpiece 1, i.e. the following translational movement the axis of the workpiece (at wheel 4) and the rotational movement around of the axis of the part (at the level of part 1 in the example illustrated).

Claims (9)

Procédé de superfinition de la surface cylindrique d'une pièce qui est destinée à être montée dans des guides circulaires et à être animée d'un mouvement de translation suivant son axe par rapport auxdits guides, consistant à placer une roue d'application d'abrasif de manière que son axe soit perpendiculaire à l'axe de ladite pièce et que sa surface latérale soit en appui contre ladite surface cylindrique, à entraíner ladite roue en rotation autour de son axe et à animer ladite pièce et/ou ladite roue de mouvements tels que la surface cylindrique de la pièce soit usinée dans son intégralité longitudinalement par abrasif, caractérisé par le fait qu'on anime ladite roue et/ou ladite pièce simultanément d'un mouvement de translation suivant l'axe de la pièce et d'un mouvement de rotation autour dudit axe à des vitesses telles que ladite surface cylindrique soit usinée de son intégralité longitudinalement par abrasif suivant une trace en hélice dont les spires successives se chevauchent.Method for superfinishing the cylindrical surface of a part which is intended to be mounted in circular guides and to be animated a translational movement along its axis relative to said guides, consisting in placing an abrasive application wheel so that its axis is perpendicular to the axis of said part and its lateral surface is in support against said cylindrical surface, to cause said wheel to rotate around its axis and to animate said part and / or said movement wheel such that the cylindrical surface of the part is machined in its entirety longitudinally by abrasive, characterized in that said animates wheel and / or said part simultaneously with a translational movement along the axis of the part and a rotational movement around said axis at speeds such that said cylindrical surface is machined from its integrally longitudinally by abrasive following a helical trace of which successive turns overlap. Procédé suivant la revendication 1, caractérisé par le fait qu'on anime ladite pièce d'un mouvement de rotation autour de son axe.Method according to claim 1, characterized in that that said part is rotated around its axis. Dispositif suivant la revendication 1 ou 2, caractérisé par le fait qu'on anime ladite roue d'un mouvement de translation suivant l'axe de la pièce.Device according to claim 1 or 2, characterized by causes said wheel to be moved in translation along the axis of the room. Procédé suivant l'une quelconque des revendications précédentes, caractérisé par le fait qu'on utilise une roue d'application d'abrasif dont au moins la partie extérieure est souple.A method according to any of the claims previous, characterized in that an application wheel is used abrasive, at least the outer part of which is flexible. Procédé suivant l'une quelconque des revendications précédentes, caractérisé par le fait qu'on utilise une roue d'application d'abrasif présentant dans sa surface latérale une gorge circonférentielle ayant un profil en arc de cercle de rayon adapté au rayon de courbure de ladite surface cylindrique de la pièce.A method according to any of the claims previous, characterized in that an application wheel is used abrasive with a circumferential groove in its lateral surface having an arcuate profile of radius adapted to the radius of curvature of said cylindrical surface of the part. Procédé suivant l'une quelconque des revendications précédentes, caractérisé par le fait qu'on applique l'abrasif contre ladite surface cylindrique en utisisant une roue abrasive.A method according to any of the claims previous, characterized in that the abrasive is applied against said cylindrical surface using an abrasive wheel. Procédé suivant l'une quelconque des revendications précédentes, caractérisé par le fait qu'on applique l'abrasif contre ladite surface cylindrique en faisant défiler une bande abrasive sur la surface latérale de ladite roue.A method according to any of the claims previous, characterized in that the abrasive is applied against said cylindrical surface by running an abrasive strip over the surface lateral of said wheel. Procédé suivant la revendication 7, caractérisé par le fait qu'on utilise une bande abrasive sans fin.Method according to claim 7, characterized in that that we use an endless abrasive belt. Procédé suivant l'une quelconque des revendications précédentes, caractérisé par le fait qu'on applique ladite roue avec une force contrôlée contre la surface cylindrique à usiner.A method according to any of the claims previous, characterized in that said wheel is applied with a controlled force against the cylindrical surface to be machined.
EP01400508A 2000-03-03 2001-02-28 Method for superfinishing workpieces having cylindrical surfaces Withdrawn EP1129818A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0002793 2000-03-03
FR0002793A FR2805768B1 (en) 2000-03-03 2000-03-03 PROCESS FOR SUPERFINISHING PARTS WITH A CYLINDRICAL SURFACE

Publications (1)

Publication Number Publication Date
EP1129818A1 true EP1129818A1 (en) 2001-09-05

Family

ID=8847719

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01400508A Withdrawn EP1129818A1 (en) 2000-03-03 2001-02-28 Method for superfinishing workpieces having cylindrical surfaces

Country Status (4)

Country Link
US (1) US6582284B2 (en)
EP (1) EP1129818A1 (en)
JP (1) JP2001293644A (en)
FR (1) FR2805768B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106625187A (en) * 2017-03-16 2017-05-10 贾建胜 Household water purifier stainless-steel cylinder surface polishing device

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3058367B1 (en) * 2013-10-16 2019-01-09 President and Fellows of Harvard College A microfluidic device for real-time clinical monitoring and quantitative assessment of whole blood coagulation
CN103878649B (en) * 2014-03-19 2017-04-05 武汉长盈通光电技术有限公司 A kind of processing method of fiber stress rod

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1017936B (en) * 1956-03-22 1957-10-17 Max Scherff Device for centerless grinding of round bars or tubes
DE1107115B (en) * 1959-03-14 1961-05-18 Otto Husemann Device for grinding pipes
FR1261304A (en) * 1960-03-31 1961-05-19 Surface finisher, transverse roughness
DE1944813A1 (en) * 1969-09-04 1971-05-19 North American Rockwell Grinding and polishing device
EP0575823A1 (en) * 1992-06-23 1993-12-29 Idromeccanica Di Rosa Valerio Smoothing-polishing machine for cylindrical surfaces

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3101577A (en) * 1961-09-18 1963-08-27 Nydals Gjuteri Och Mek Verkst Methods of grinding or polishing elongated rotational bodies
US4203261A (en) * 1977-03-14 1980-05-20 Tasco, Inc. Abrasive belt machining apparatus
US5759089A (en) * 1996-01-16 1998-06-02 Mccoy; Thomas Edward Apparatus for in-line surface finishing of cylindrical tubing such as stainless steel tubing with supporting mandrel and method
US6358133B1 (en) * 1998-02-06 2002-03-19 3M Innovative Properties Company Grinding wheel

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1017936B (en) * 1956-03-22 1957-10-17 Max Scherff Device for centerless grinding of round bars or tubes
DE1107115B (en) * 1959-03-14 1961-05-18 Otto Husemann Device for grinding pipes
FR1261304A (en) * 1960-03-31 1961-05-19 Surface finisher, transverse roughness
DE1944813A1 (en) * 1969-09-04 1971-05-19 North American Rockwell Grinding and polishing device
EP0575823A1 (en) * 1992-06-23 1993-12-29 Idromeccanica Di Rosa Valerio Smoothing-polishing machine for cylindrical surfaces

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106625187A (en) * 2017-03-16 2017-05-10 贾建胜 Household water purifier stainless-steel cylinder surface polishing device
CN106625187B (en) * 2017-03-16 2018-11-13 绍兴柯桥实在纺织有限公司 A kind of household water filter stainless steel cylinder surface polishing device

Also Published As

Publication number Publication date
US20010023165A1 (en) 2001-09-20
US6582284B2 (en) 2003-06-24
FR2805768B1 (en) 2002-06-14
JP2001293644A (en) 2001-10-23
FR2805768A1 (en) 2001-09-07

Similar Documents

Publication Publication Date Title
EP1606079B1 (en) Machine for grinding optical lenses
FR2689794A1 (en) Machine to machine the edge of a spectacle lens.
CH671726A5 (en)
FR2543860A1 (en) METHOD AND DEVICE FOR MANUFACTURING AND MACHINING WHEELS
EP1129818A1 (en) Method for superfinishing workpieces having cylindrical surfaces
CA2452060C (en) Device for transporting parts for supplying machines
EP1336454B1 (en) Method and apparatus using abrasive belt for superfinishing workpiece bearing surfaces, in particular for the superfinishing of cam surface on a camshaft
EP0896856B1 (en) Machine tool especially for superfinishing of cylindrical surfaces of revolution by means of a tangential running grinding belt
FR2655904A1 (en) System of the "cable" type for cutting solid bodies
EP0258109A1 (en) Method and apparatus for bending metallic wires
FR2687945A1 (en) GENERATION TURNING METHOD AND DEVICE.
FR2708882A1 (en) Method and device for straightening metal wires for a bending machine
FR2694228A1 (en) Method for performing precision grinding of camshaft cams and precision grinding machine for carrying out this process
FR2937576A1 (en) Wooden revolution part i.e. fishing float, fabricating method, involves continuously adjusting distance between axes of cutting tools and axis of bar according to translation position of bar with respect to chassis
FR3086194A1 (en) OPTICAL GLASS MACHINE HAVING AT LEAST ONE CUTTING WIRE, AND METHOD FOR MACHINING AN OPTICAL GLASS THEREOF
FR2694902A1 (en) Machine for surface finishing of workpieces
FR2518003A1 (en) Reconditioning small diameter holes - by burnishing with wire rotating at high speed
FR2562456A1 (en) Process and device for surface treatment of a glass bar
FR2791292A1 (en) SET FOR MACHINING PARTS BY ABRASIVE, ESPECIALLY SUPERFINISHED
FR2555483A1 (en) Gear tooth flank grinding machine
BE541127A (en)
FR2529496A1 (en) APPARATUS AND METHOD FOR MACHINING HOLES IN PIECES AND SIMULTANEOUS, NO-INK RECTIFICATION OF EXTERNAL REVOLUTION SURFACES
CH332922A (en) Method for profiling a grinding wheel and device for implementing this method
FR2462227A1 (en) IMPROVEMENTS ON TUBE CUTTERS
FR2952844A1 (en) Tool for trimming e.g. machined part of motor vehicle, has trimming elements assembled with respect to support, where roughness of trimming surface of trimming elements is greater than that of one end of trimming elements

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

17P Request for examination filed

Effective date: 20020305

AKX Designation fees paid

Free format text: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

17Q First examination report despatched

Effective date: 20080529

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20081209