EP0680806A1 - Tooling for belt finishing of cylindrical bearings with diameter control of the bearings - Google Patents

Tooling for belt finishing of cylindrical bearings with diameter control of the bearings Download PDF

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Publication number
EP0680806A1
EP0680806A1 EP95400993A EP95400993A EP0680806A1 EP 0680806 A1 EP0680806 A1 EP 0680806A1 EP 95400993 A EP95400993 A EP 95400993A EP 95400993 A EP95400993 A EP 95400993A EP 0680806 A1 EP0680806 A1 EP 0680806A1
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EP
European Patent Office
Prior art keywords
arm
angle
axis
machined
pads
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Granted
Application number
EP95400993A
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German (de)
French (fr)
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EP0680806B1 (en
Inventor
Jean-Claude Pineau
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Procedes Machines Speciales S P M S Ste
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Procedes Machines Speciales S P M S Ste
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • 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
    • B24B5/42—Single-purpose machines or devices for grinding crankshafts or crankpins
    • 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
    • B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
    • B24B49/02—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation according to the instantaneous size and required size of the workpiece acted upon, the measuring or gauging being continuous or intermittent
    • B24B49/04—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation according to the instantaneous size and required size of the workpiece acted upon, the measuring or gauging being continuous or intermittent involving measurement of the workpiece at the place of grinding during grinding operation

Definitions

  • the present invention relates to a tool for grooming cylindrical seats on parts, in particular journals and crank pins on crankshafts, with diameter control of the seats.
  • Grooming machines known from the applicant's patent application EP-A-0 366 506 include, for each surface to be machined on a workpiece, a pivoting arm movable vertically, and three abrasive band application pads mounted, a first in the upper middle position on the arm and the other two in the lower lateral position on two jaws articulated on the arm and coupled so that they can be clamped against each other, so that when tightening against the reach machine, the three pads are arranged substantially at the three angles of an equilateral triangle.
  • the abrasive belt application pads have an application surface in a circular arc extending over a relatively small angle, generally less than 30 °. These tools give good results with regard to the condition of the surfaces of the spans.
  • honing and grooming machines using stones or pads extending over angles of more than 30 ° allow, by their enveloping shape, to better compensate for shape defects (ovalization, runout, etc.) and the defects of rectitude of the parts.
  • control gauge mounted on one of the jaws and comprising two opposite sensors, aligned, to measure the diameter of the bearing surface, during the machining of the latter, and possibly controlling the stopping of the machining when this diameter reaches a predetermined value.
  • the Applicant is not aware of the use of a diameter control device on a grooming tool comprising three enveloping pads arranged in a triangle, the first on one arm and the other two on two jaws articulated on said arm.
  • the present invention relates to a tool for applying an abrasive strip against cylindrical surfaces to be machined on parts, in particular the journals and crankshaft pins, with control of the diameter of the surfaces, this tool comprising enveloping pads to meet requirements. severe with regard to the absence of defects in form, straightness and precision of the spans.
  • the tool object of the invention is intended for the application of an abrasive belt on a machine for grooming spans cylindrical on parts, in particular trunnions and crank pins on crankshafts, comprising for each reach to be machined a pivoting arm movable vertically, and three abrasive band application pads mounted one in the middle position on the arm and the other two in low lateral position on two jaws articulated on the arm and coupled so that they can be tightened against each other, so that when tightening against the bearing to be machined, the three pads are arranged substantially at the angles of a equilateral triangle.
  • the arm carries a first pad having a concave surface for applying abrasive tape extending over an angle greater than 90 ° and less than 180 °.
  • the arm also carries a control gauge with two opposite sensors aligned horizontally, located below the two angular ends of the first shoe, to measure the diameter of the bearing to be machined.
  • Each of the two jaws carries a second shoe having a concave surface for applying abrasive tape extending over an angle slightly less than 90 °, so that in the tightened state around the surface to be machined, the three shoes surround the scope to be machined at least 270 °, the first above and the second two below the two caliber sensors located on the same diameter of the scope.
  • the first shoe and the gauge are fixed to a support mounted on the arm with limited mobility in horizontal translation perpendicular to the axis of the bearing to be machined.
  • the two second pads can be mounted on their jaws with limited mobility in oscillation around axes parallel to the axis of the scope.
  • the support of the first shoe and of the caliber is advantageously mounted on the arm also with limited mobility in oscillation around an axis perpendicular to the axis of the bearing to be machined.
  • Said axis of articulation of the support preferably passes a short distance above the axis of the bearing surface to be machined.
  • FIG. 1 An illustrative and nonlimiting embodiment of a tool according to the invention will be described below in more detail.
  • the unique figure of drawing is an overall view of the lower part of a grooming arm carrying the grooming and control tools according to the invention.
  • the grooming and control tool according to the invention is used on a machine according to patent application EP-AO 366 506 for the abrasive machining of cylindrical surfaces on parts, in particular for machining by crankshaft journals and crank pins.
  • an arm 1 mounted freely pivoting about a horizontal axis on a slide not shown movable vertically.
  • the arm 1 carries two jaws 2a, 2b articulated by horizontal axes 3a and 3b on the arm 1 and coupled by toothed segments 4a, 4b so as to be able to be clamped one against the other by synchronous pivoting in opposition with respect on arm 1, under the action of a common actuating cylinder 5.
  • a first shoe 7 is mounted in the upper middle position on the arm 1 and two second shoes 8a and 8b are mounted in the lower lateral position on the two jaws 2a and 2b in such a way that when, after lowering the arm 1 to bring the first shoe 7 onto the working surface, the three shoes 7, 8a and 8b are tightened, under the action of the jack 5, against the bearing surface 6, for the application against this bearing surface 6 of an abrasive strip 9, the three pads 7, 8a and 8b are arranged substantially at the three angles of an equilateral triangle. Due to the balancing of the mass of the arm 1 by a balancing means not shown, for example a jack with controlled supply pressure, the three pads are thus applied with a substantially uniform pressure against the bearing surface 6 to be machined.
  • the first pad 7 has, for the application of the abrasive strip 9 against the surface 6 to be machined, a concave application surface extending over an angle slightly less than 180 °, in this case over an angle of approximately 160 °.
  • the two second pads 8a and 8b have, for the application of the same abrasive strip 9 against the surface 6, each a concave application surface extending over an angle slightly less than 90 °, in this case on an angle of about 70 °.
  • the pad 7 envelopes approximately the upper half of the bearing surface 6 and each second pad 8a, 8b envelopes approximately a lower quarter of the bearing surface 6, two diametrically free spaces opposites remaining between each of the two angular ends of the upper shoe 7 and the corresponding upper angular end of each lower shoe 8a, 8b.
  • the two lower pads 8a, 8b are mounted on the jaw 2a, 2b respectively by pivot axes 12a, 12b parallel to the axis of the bearing surface 6, so as to have, as indicated by arrows 11a and 11b, mobility limited in oscillation around axes 12a, 12b.
  • the upper shoe 7 is mounted on a support 13 in inverted U, the two arms 14a, 14b each carrying, at their lower end, a pin 15a, 15b, the two pins 15a, 15b being aligned horizontally on an axis perpendicular to the axis of the bearing surface 6 and being pivotally mounted and movable in translation along their axis on the lower ends of a yoke 17 fixed to the arm 1.
  • a control gauge 16 in inverted U comprising two opposite aligned sensors, is also fixed to the support 13 carrying the upper shoe 7, so that its two sensors, when the three jaws 7, 8a and 8b are clamped against the bearing 6 to be machined, are located on a horizontal line corresponding to the diameter of the bearing surface 6 and thus measure the diameter of the latter.
  • the abrasive strip 9 arrives between the two lower pads 8a, 8b, passes for example between the pad 8b and the surface 6, then departs from the surface 6 to bypass one of the sensors of the caliber 16, passes over a roller of return, returns to the range 6 to pass between the upper shoe 7 and the range 6, then departs again from the range 6 and passes over a return roller, to bypass the other sensor of the caliber 16, then returns to the scope 6 to pass between the pad 8a and the scope 6, and finally comes out between the two pads 8a and 8b.
  • the upper shoe 7 could extend over a smaller angle, but greater than 90 ° and preferably greater than 120 °
  • the lower shoes 8a, 8b could each extend over a smaller or larger angle, but preferably between about 60 ° and 80 °, so that the three pads 7, 8a and 8b together surround the scope 6 as completely as possible, preferably at an angle equal to or greater than 270 °.
  • the sensors of the measurement gauge 16 can, in the context of the invention, consist of sensors of known type, for example electronic or pneumatic sensors.

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  • 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)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)

Abstract

The applicator, esp. for an abrasive strip used in machining cylindrical components such as crankshaft journals, consists of an arm which is able to pivot and move vertically, equipped with three shoes (7,8) - an upper central one (7) and two lower lateral ones (8a,8b) on jaws (2a,2b) which are pivoted to the arm and able to lock together so that the three shoes are located at the points of an equilateral triangle round the journal (6). The arm's first shoe has a concave surface for the abrasive strip, covering an angle of over 90 but less than 180 degrees, and is controlled by two horizontal sensors situated between the ends of the shoe and which measure the diameter of the journal. Each of the shoes on the two jaws also has a concave surface which extends through an angle of slightly less than 90 degrees, so that the three shoes together cover an angle of at least 270 degrees round the outer surface of the journal. <IMAGE>

Description

La présente invention se rapporte à un outillage pour le toilage de portées cylindriques sur des pièces, notamment des tourillons et manetons sur des vilebrequins, avec contrôle de diamètre des portées.The present invention relates to a tool for grooming cylindrical seats on parts, in particular journals and crank pins on crankshafts, with diameter control of the seats.

Des machines de toilage connues par la demande de brevet EP-A-0 366 506 de la demanderesse comprennent, pour chaque portée à usiner sur une pièce, un bras pivotant et mobile verticalement, et trois patins d'application de bande abrasive montés, un premier en position médiane haute sur le bras et les deux autres en position latérale basse sur deux mâchoires articulées sur le bras et couplées de manière à pouvoir être serrées l'une contre l'autre, de telle manière que lors du serrage contre la portée à usiner, les trois patins soient disposés sensiblement aux trois angles d'un triangle équilatéral.Grooming machines known from the applicant's patent application EP-A-0 366 506 include, for each surface to be machined on a workpiece, a pivoting arm movable vertically, and three abrasive band application pads mounted, a first in the upper middle position on the arm and the other two in the lower lateral position on two jaws articulated on the arm and coupled so that they can be clamped against each other, so that when tightening against the reach machine, the three pads are arranged substantially at the three angles of an equilateral triangle.

Sur ces machines connues, les patins d'application de bande abrasive présentent une surface d'application en arc de cercle s'étendant sur un angle relativement faible, généralement inférieur à 30°. Ces outils donnent de bons résultats en ce qui concerne l'état des surfaces des portées.On these known machines, the abrasive belt application pads have an application surface in a circular arc extending over a relatively small angle, generally less than 30 °. These tools give good results with regard to the condition of the surfaces of the spans.

Il est par ailleurs connu d'utiliser, pour l'usinage par pierrage de portées cylindrique sur les pièces, des pierres dont la surface en arc de cercle, en contact avec la portée à usiner, s'étend sur un angle pouvant aller jusqu'à 60°. Toutefois, ces pierres, lors de l'usinage, subissent une usure asymétrique qui fait qu'en réalité, c'est sur un angle nettement inférieur à 60° que les pierres exercent leur pression et donc leur effet d'usinage par pierrage sur la portée à usiner.It is moreover known to use, for machining by cylindrical bearing surfaces on the parts, stones whose surface in an arc of a circle, in contact with the surface to be machined, extends over an angle which can go up to at 60 °. However, these stones, during machining, undergo asymmetrical wear which means that in reality, it is at an angle much less than 60 ° that the stones exert their pressure and therefore their effect of machining by honing on the worn to machine.

Par contre, les machines de pierrage et de toilage utilisant des pierres ou des patins s'étendant sur des angles de plus de 30° permettent, par leur forme enveloppante de mieux compenser des défauts de forme (ovalisation, faux-rond, etc.) et les défauts de rectitude des parties.On the other hand, honing and grooming machines using stones or pads extending over angles of more than 30 ° allow, by their enveloping shape, to better compensate for shape defects (ovalization, runout, etc.) and the defects of rectitude of the parts.

Enfin, on connaît également des machines d'usinage par toilage sur lesquelles les outils en contact avec chaque portée cylindrique à usiner comprennent deux patins opposés d'application de bande abrasive, ces deux patins étant disposés sur deux mâchoires d'une pince et pouvant avoir chacun une surface d'application en arc de cercle s'étendant sur presque 180°. L'inconvénient de ces patins connus utilisés par paire consiste dans une mauvaise répartition de la pression d'application. En effet, cette pression est inévitablement concentrée dans la partie médiane de la longueur de la surface en arc de cercle de chacun des deux patins opposés.Finally, there are also known machines for machining by grinding on which the tools in contact with each cylindrical surface to be machined comprise two opposite pads for applying an abrasive band, these two pads being arranged on two jaws of a clamp and being able to have each an application surface in an arc extending almost 180 °. The disadvantage of these known pads used in pairs consists in a poor distribution of the application pressure. Indeed, this pressure is inevitably concentrated in the middle part of the length of the surface in an arc of a circle of each of the two opposite pads.

Sur les machines de toilage à deux patins d'application opposés, il est par ailleurs connu d'associer à l'un des deux patins un calibre de contrôle monté sur l'une des mâchoires et comprenant deux capteurs opposés, alignés, pour mesurer le diamètre de la portée, pendant l'usinage de cette dernière, et éventuellement commander l'arrêt de l'usinage lorsque ce diamètre atteint une valeur prédéterminée.On grooming machines with two opposite application pads, it is also known to associate with one of the two pads a control gauge mounted on one of the jaws and comprising two opposite sensors, aligned, to measure the diameter of the bearing surface, during the machining of the latter, and possibly controlling the stopping of the machining when this diameter reaches a predetermined value.

La demanderesse n'a pas connaissance de l'utilisation d'un dispositif de contrôle de diamètre sur un outillage de toilage comprenant trois patins enveloppants disposés en triangle, le premier sur un bras et les deux autres sur deux mâchoires articulées sur ledit bras.The Applicant is not aware of the use of a diameter control device on a grooming tool comprising three enveloping pads arranged in a triangle, the first on one arm and the other two on two jaws articulated on said arm.

La présente invention vise un outillage pour l'application de bande abrasive contre des portées cylindriques à usiner sur des pièces, notamment les tourillons et les manetons de vilebrequins, avec contrôle du diamètre des portées, cet outillage comprenant des patins enveloppants pour répondre à des exigences sévères en ce qui concerne l'absence de défauts de forme, la rectitude et la précision des portées.The present invention relates to a tool for applying an abrasive strip against cylindrical surfaces to be machined on parts, in particular the journals and crankshaft pins, with control of the diameter of the surfaces, this tool comprising enveloping pads to meet requirements. severe with regard to the absence of defects in form, straightness and precision of the spans.

L'outillage objet de l'invention est destiné à l'application de bande abrasive sur une machine d'usinage par toilage de portées cylindriques sur des pièces, notamment des tourillons et manetons sur des vilebrequins, comprenant pour chaque portée à usiner un bras pivotant et mobile verticalement, et trois patins d'application de bande abrasive montés un premier en position médiane sur le bras et les deux autres en position latérale basse sur deux mâchoires articulées sur le bras et couplées de manière à pouvoir être serrées l'une contre l'autre, de telle manière que lors du serrage contre la portée à usiner, les trois patins soient disposés sensiblement aux angles d'un triangle équilatéral. Le bras porte un premier patin présentant une surface concave d'application de bande abrasive s'étendant sur un angle supérieur à 90° et inférieur à 180°. Le bras porte, en outre, un calibre de contrôle avec deux capteurs opposés alignés horizontalement, situés en dessous des deux extrémités angulaires du premier patin, pour mesurer le diamètre de la portée à usiner. Chacune des deux mâchoires porte un deuxième patin présentant une surface concave d'application de bande abrasive s'étendant sur un angle légèrement inférieur à 90°, de telle manière qu'à l'état serré autour de la portée à usiner, les trois patins enveloppent la portée à usiner sur au moins 270°, le premier au-dessus et les deux seconds en dessous des deux capteurs du calibre situés sur un même diamètre de la portée.The tool object of the invention is intended for the application of an abrasive belt on a machine for grooming spans cylindrical on parts, in particular trunnions and crank pins on crankshafts, comprising for each reach to be machined a pivoting arm movable vertically, and three abrasive band application pads mounted one in the middle position on the arm and the other two in low lateral position on two jaws articulated on the arm and coupled so that they can be tightened against each other, so that when tightening against the bearing to be machined, the three pads are arranged substantially at the angles of a equilateral triangle. The arm carries a first pad having a concave surface for applying abrasive tape extending over an angle greater than 90 ° and less than 180 °. The arm also carries a control gauge with two opposite sensors aligned horizontally, located below the two angular ends of the first shoe, to measure the diameter of the bearing to be machined. Each of the two jaws carries a second shoe having a concave surface for applying abrasive tape extending over an angle slightly less than 90 °, so that in the tightened state around the surface to be machined, the three shoes surround the scope to be machined at least 270 °, the first above and the second two below the two caliber sensors located on the same diameter of the scope.

De préférence, le premier patin et le calibre sont fixés à un support monté sur le bras avec une mobilité limitée en translation horizontale perpendiculairement à l'axe de la portée à usiner. Les deux seconds patins peuvent être montés sur leurs mâchoires avec une mobilité limitée en oscillation autour d'axes parallèles à l'axe de la portée.Preferably, the first shoe and the gauge are fixed to a support mounted on the arm with limited mobility in horizontal translation perpendicular to the axis of the bearing to be machined. The two second pads can be mounted on their jaws with limited mobility in oscillation around axes parallel to the axis of the scope.

Par ailleurs, le support du premier patin et du calibre est avantageusement monté sur le bras également avec une mobilité limitée en oscillation autour d'un axe perpendiculaire à l'axe de la portée à usiner.Furthermore, the support of the first shoe and of the caliber is advantageously mounted on the arm also with limited mobility in oscillation around an axis perpendicular to the axis of the bearing to be machined.

Ledit axe d'articulation du support passe de préférence à faible distance au-dessus de l'axe de la portée à usiner.Said axis of articulation of the support preferably passes a short distance above the axis of the bearing surface to be machined.

En se référant au dessin schématique annexé, on va décrire ci-après plus en détail un mode de réalisation illustratif et non limitatif d'un outillage conforme à l'invention. La figure unique du dessin est une vue d'ensemble de la partie inférieure d'un bras de toilage portant l'outillage de toilage et de contrôle conforme à l'invention.Referring to the attached schematic drawing, an illustrative and nonlimiting embodiment of a tool according to the invention will be described below in more detail. The unique figure of drawing is an overall view of the lower part of a grooming arm carrying the grooming and control tools according to the invention.

Tel qu'illustré par le dessin, l'outillage de toilage et de contrôle conforme à l'invention est utilisé sur une machine suivant la demande de brevet EP-A-O 366 506 pour l'usinage par abrasif de portées cylindriques sur des pièces, notamment pour l'usinage par toilage des tourillons et manetons de vilebrequins.As illustrated by the drawing, the grooming and control tool according to the invention is used on a machine according to patent application EP-AO 366 506 for the abrasive machining of cylindrical surfaces on parts, in particular for machining by crankshaft journals and crank pins.

On reconnaît sur la figure unique du dessin un bras 1 monté librement pivotant autour d'un axe horizontal sur un coulisseau non représenté mobile verticalement. Le bras 1 porte deux mâchoires 2a, 2b articulées par des axes horizontaux 3a et 3b sur le bras 1 et couplées par des segments dentés 4a, 4b de manière à pouvoir être serrées l'une contre l'autre par pivotement synchrone en opposition par rapport au bras 1, sous l'action d'un vérin de manoeuvre 5 commun.We recognize in the single figure of the drawing an arm 1 mounted freely pivoting about a horizontal axis on a slide not shown movable vertically. The arm 1 carries two jaws 2a, 2b articulated by horizontal axes 3a and 3b on the arm 1 and coupled by toothed segments 4a, 4b so as to be able to be clamped one against the other by synchronous pivoting in opposition with respect on arm 1, under the action of a common actuating cylinder 5.

En vue de l'usinage par toilage d'une portée cylindrique 6, par exemple d'un maneton ou tourillon d'un vilebrequin, un premier patin 7 est monté en position médiane haute sur le bras 1 et deux seconds patins 8a et 8b sont montés en position latérale basse sur les deux mâchoires 2a et 2b de telle manière que lorsque, après abaissement du bras 1 pour faire porter le premier patin 7 sur la portée à usiner, les trois patins 7, 8a et 8b sont serrés, sous l'action du vérin 5, contre la portée 6, en vue de l'application contre cette portée 6 d'une bande abrasive 9, les trois patins 7, 8a et 8b soient disposés sensiblement aux trois angles d'un triangle équilatéral. Du fait de l'équilibrage de la masse du bras 1 par un moyen d'équilibrage non représenté, par exemple un vérin à pression d'alimentation contrôlée, les trois patins sont ainsi appliqués avec une pression sensiblement uniforme contre la portée 6 à usiner.For the purpose of machining a cylindrical bearing surface 6, for example of a crank pin or journal of a crankshaft, a first shoe 7 is mounted in the upper middle position on the arm 1 and two second shoes 8a and 8b are mounted in the lower lateral position on the two jaws 2a and 2b in such a way that when, after lowering the arm 1 to bring the first shoe 7 onto the working surface, the three shoes 7, 8a and 8b are tightened, under the action of the jack 5, against the bearing surface 6, for the application against this bearing surface 6 of an abrasive strip 9, the three pads 7, 8a and 8b are arranged substantially at the three angles of an equilateral triangle. Due to the balancing of the mass of the arm 1 by a balancing means not shown, for example a jack with controlled supply pressure, the three pads are thus applied with a substantially uniform pressure against the bearing surface 6 to be machined.

Le premier patin 7 présente, pour l'application de la bande abrasive 9 contre la portée 6 à usiner, une surface concave d'application s'étendant sur un angle légèrement inférieur à 180°, en l'occurence sur un angle d'environ 160°. Les deux seconds patins 8a et 8b présentent, pour l'application de la même bande abrasive 9 contre la portée 6, chacun une surface concave d'application s'étendant sur un angle légèrement inférieur à 90°, en l'occurence sur un angle d'environ 70°. A l'état serré des patins 7, 8a et 8b, le patin 7 enveloppe à peu près la moitié supérieure de la portée 6 et chaque second patin 8a, 8b enveloppe à peu près un quart inférieur de la portée 6, deux espaces libres diamètralement opposés subsistant entre chacune des deux extrémités angulaires du patin supérieur 7 et l'extrémité angulaire supérieure correspondante de chaque patin inférieur 8a, 8b.The first pad 7 has, for the application of the abrasive strip 9 against the surface 6 to be machined, a concave application surface extending over an angle slightly less than 180 °, in this case over an angle of approximately 160 °. The two second pads 8a and 8b have, for the application of the same abrasive strip 9 against the surface 6, each a concave application surface extending over an angle slightly less than 90 °, in this case on an angle of about 70 °. In the tightened state of the pads 7, 8a and 8b, the pad 7 envelopes approximately the upper half of the bearing surface 6 and each second pad 8a, 8b envelopes approximately a lower quarter of the bearing surface 6, two diametrically free spaces opposites remaining between each of the two angular ends of the upper shoe 7 and the corresponding upper angular end of each lower shoe 8a, 8b.

Les deux patins inférieurs 8a, 8b sont montés sur la mâchoire 2a, 2b respective par des axes de pivotement 12a, 12b parallèles à l'axe de la portée 6, de manière à présenter, comme indiqué par des flèches 11a et 11b, une mobilité limitée en oscillation autour des axes 12a,12b.The two lower pads 8a, 8b are mounted on the jaw 2a, 2b respectively by pivot axes 12a, 12b parallel to the axis of the bearing surface 6, so as to have, as indicated by arrows 11a and 11b, mobility limited in oscillation around axes 12a, 12b.

Le patin supérieur 7 est monté sur un support 13 en U renversé dont les deux bras 14a, 14b portent, à leur extrémité inférieure, chacun un tourillon 15a, 15b, les deux tourillons 15a, 15b étant alignés horizontalement sur un axe perpendiculaire à l'axe de la portée 6 et étant montés pivotants et mobiles en translation suivant leur axe sur les extrémité inférieures d'une chape 17 fixée au bras 1.The upper shoe 7 is mounted on a support 13 in inverted U, the two arms 14a, 14b each carrying, at their lower end, a pin 15a, 15b, the two pins 15a, 15b being aligned horizontally on an axis perpendicular to the axis of the bearing surface 6 and being pivotally mounted and movable in translation along their axis on the lower ends of a yoke 17 fixed to the arm 1.

Un calibre de contrôle 16 en U renversé, comportant deux capteurs opposés alignés, est également fixé au support 13 portant le patin supérieur 7, de telle manière que ses deux capteurs, lorsque les trois mâchoires 7, 8a et 8b sont serrées contre la portée 6 à usiner, soient situés sur une ligne horizontale correspondant au diamètre de la portée 6 et mesurent ainsi le diamètre de cette dernière.A control gauge 16 in inverted U, comprising two opposite aligned sensors, is also fixed to the support 13 carrying the upper shoe 7, so that its two sensors, when the three jaws 7, 8a and 8b are clamped against the bearing 6 to be machined, are located on a horizontal line corresponding to the diameter of the bearing surface 6 and thus measure the diameter of the latter.

La bande abrasive 9 arrive entre les deux patins inférieurs 8a, 8b, passe par exemple entre le patin 8b et la portée 6, s'écarte ensuite de la portée 6 pour contourner l'un des capteurs du calibre 16, passe sur un galet de renvoi, revient vers la portée 6 pour passer entre le patin supérieur 7 et la portée 6, s'écarte ensuite de nouveau de la portée 6 et passe sur un galet de renvoi, pour contourner l'autre capteur du calibre 16, revient ensuite à la portée 6 pour passer entre le patin 8a et la portée 6, et ressort enfin entre les deux patins 8a et 8b.The abrasive strip 9 arrives between the two lower pads 8a, 8b, passes for example between the pad 8b and the surface 6, then departs from the surface 6 to bypass one of the sensors of the caliber 16, passes over a roller of return, returns to the range 6 to pass between the upper shoe 7 and the range 6, then departs again from the range 6 and passes over a return roller, to bypass the other sensor of the caliber 16, then returns to the scope 6 to pass between the pad 8a and the scope 6, and finally comes out between the two pads 8a and 8b.

Les deux tourillons 15a et 15b qui permettent au support 13 et par conséquent au patin supérieur 7 et au calibre de contrôle 16 tous deux montés sur le support 13, une mobilité limitée en translation horizontale perpendiculairement à l'axe de la portée 6 (flèche 10) et une mobilité limitée en oscillation autour de leur axe qui est perpendiculaire à l'axe de la portée 6, sont décalés à faible distance au-dessus de l'axe des capteurs du calibre 16, lequel, lorsque patins 7, 8a et 8b sont serrés autour de la portée 6, est confondu avec une ligne diamètrale horizontale de la portée 6.The two pins 15a and 15b which allow the support 13 and therefore the upper shoe 7 and the control gauge 16 all two mounted on the support 13, limited mobility in horizontal translation perpendicular to the axis of the bearing 6 (arrow 10) and limited mobility in oscillation around their axis which is perpendicular to the axis of the bearing 6, are offset at a short distance above the axis of the 16 gauge sensors, which, when the pads 7, 8a and 8b are tightened around the bearing surface 6, is confused with a horizontal diametrical line of the bearing surface 6.

Il va de soi que le mode de réalisation représenté et décrit n'a été donnée 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 goes without saying that the embodiment shown and described has been given only by way of illustrative and nonlimiting example and that numerous modifications and variants are possible within the scope of the invention.

Ainsi, le patin supérieur 7 pourrait s'étendre sur un angle plus faible, mais supérieur à 90° et de préférence supérieur à 120°, et les patins inférieurs 8a, 8b pourraient s'étendre chacun sur un angle plus faible ou plus important, mais de préférence compris entre environ 60° et 80°, de manière que les trois patins 7, 8a et 8b enveloppent ensemble la portée 6 le plus complètement possible, de préférence sur un angle égal ou supérieur à 270°.Thus, the upper shoe 7 could extend over a smaller angle, but greater than 90 ° and preferably greater than 120 °, and the lower shoes 8a, 8b could each extend over a smaller or larger angle, but preferably between about 60 ° and 80 °, so that the three pads 7, 8a and 8b together surround the scope 6 as completely as possible, preferably at an angle equal to or greater than 270 °.

Les capteurs du calibre de mesure 16 peuvent, dans le cadre de l'invention, être constitués par des capteurs de type connu, par exemple des capteurs électroniques ou pneumatiques.The sensors of the measurement gauge 16 can, in the context of the invention, consist of sensors of known type, for example electronic or pneumatic sensors.

Claims (7)

Outillage pour l'application de bande abrasive sur une machine d'usinage par toilage de portées cylindriques sur des pièces, notamment des tourillons et manetons sur des vilebrequins, comprenant, pour chaque portée (6) à usiner, un bras (1) pivotant et mobile verticalement, et trois patins (7, 8) d'application de bande abrasive montés, un premier (7) en position médiane haute sur le bras (1) et les deux autres (8) en position latérale basse sur deux mâchoires (2a, 2b) articulées sur le bras et couplées de manière à pouvoir être serrées l'une contre l'autre, de telle manière que lors du serrage contre la portée (6) à usiner, les trois patins soient disposés sensiblement aux trois angles d'un triangle équilatéral, caractérisé par le fait que le bras (1) porte un premier patin (7) présentant une surface concave d'application de bande abrasive s'étendant sur un angle supérieur à 90° et inférieur à 180°, ainsi qu'un calibre de contrôle (16) avec deux capteurs opposés, alignés horizontalement, situés en dessous des deux extrémités angulaires du premier patin pour mesurer le diamètre de la portée, et que chacune des deux mâchoires (2a, 2b) porte un second patin (8a, 8b) présentant une surface concave d'application de bande abrasive s'étendant sur un angle légèrement inférieur à 90°, de telle manière qu'à l'état serré autour de la portée à usiner, les trois patins enveloppent ensemble la portée à usiner sur au moins 270°, le premier au-dessus et les deux seconds en dessous des deux capteurs du calibre situés sur un même diamètre de la portée.Tools for applying an abrasive strip on a machine for grinding cylindrical seats on parts, in particular journals and crank pins on crankshafts, comprising, for each seat (6) to be machined, a pivoting arm (1) and vertically movable, and three pads (7, 8) for applying the abrasive band mounted, a first (7) in the high middle position on the arm (1) and the other two (8) in the low lateral position on two jaws (2a , 2b) articulated on the arm and coupled so as to be able to be tightened one against the other, in such a way that when tightening against the bearing surface (6) to be machined, the three pads are arranged substantially at the three angles of an equilateral triangle, characterized in that the arm (1) carries a first pad (7) having a concave surface for applying abrasive tape extending over an angle greater than 90 ° and less than 180 °, as well as a control gauge (16) with two sensors opposite, horizontally aligned, located below the two angular ends of the first pad to measure the diameter of the seat, and that each of the two jaws (2a, 2b) carries a second pad (8a, 8b) having a concave application surface of abrasive tape extending at an angle slightly less than 90 °, so that when tightened around the work surface, the three pads together surround the work surface over at least 270 °, the first to above and the second two below the two caliber sensors located on the same diameter of the scope. Outillage suivant la revendication 1, caractérisé par le fait que le premier patin (7) présente une surface d'application de bande abrasive s'étendant sur un angle supérieur à 120°, de préférence sur un angle d'environ 160°.Tool according to claim 1, characterized in that the first pad (7) has an abrasive band application surface extending over an angle greater than 120 °, preferably over an angle of approximately 160 °. Outillage suivant la revendication 1 ou 2, caractérisé par le fait que chaque second patin (8a, 8b) présente une surface d'application de bande abrasive s'étendant sur un angle compris entre 60° et 80°, de préférence sur un angle d'environ 70°.Tool according to claim 1 or 2, characterized in that each second pad (8a, 8b) has an abrasive band application surface extending over an angle between 60 ° and 80 °, preferably over an angle d 'around 70 °. Outillage suivant l'une quelconque des revendications précédentes, caractérisé par le fait que le premier patin (7) et le calibre (16) sont fixés à un support (13) monté sur le bras (1) avec une mobilité limitée en translation horizontale perpendiculairement à l'axe de la portée à usiner et que les deux seconds patins (8a, 8b) sont montés sur leurs mâchoires (2a, 2b) avec une mobilité limitée en oscillation autour d'axes parallèles à l'axe de la portée à usiner.Tool according to any one of the claims above, characterized in that the first shoe (7) and the gauge (16) are fixed to a support (13) mounted on the arm (1) with limited mobility in horizontal translation perpendicular to the axis of the bearing to machining and that the two second pads (8a, 8b) are mounted on their jaws (2a, 2b) with limited mobility in oscillation around axes parallel to the axis of the bearing surface to be machined. Outillage suivant la revendication 4, caractérisé par le fait que le support (13) portant le premier patin (7) et le calibre (16) est monté sur le bras (1) avec une mobilité limitée en oscillation autour d'un axe perpendiculaire à l'axe de la portée à usiner.Tool according to claim 4, characterized in that the support (13) carrying the first shoe (7) and the gauge (16) is mounted on the arm (1) with limited mobility in oscillation around an axis perpendicular to the axis of the bearing to be machined. Outillage suivant la revendication 5, caractérisé par le fait que l'axe d'oscillation du support (13) est situé à faible distance au-dessus de l'axe de la portée à usiner.Tool according to Claim 5, characterized in that the axis of oscillation of the support (13) is located a short distance above the axis of the bearing to be machined. Outillage suivant la revendication 6, caractérisé par le fait que le support (13) présente une forme en U renversé avec deux bras (14a, 14b) portant à leur extrémité inférieure des tourillons (15a, 15b) alignés, montés pivotants et mobiles en translation axiale sur une chape (17) fixée au bras (1).Tool according to claim 6, characterized in that the support (13) has an inverted U-shape with two arms (14a, 14b) carrying at their lower end journals (15a, 15b) aligned, pivotally mounted and movable in translation axial on a yoke (17) fixed to the arm (1).
EP95400993A 1994-05-04 1995-05-02 Tooling for belt finishing of cylindrical bearings with diameter control of the bearings Expired - Lifetime EP0680806B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9405449 1994-05-04
FR9405449A FR2719516B1 (en) 1994-05-04 1994-05-04 Tools for the grooming of cylindrical spans with diameter control of spans.

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EP0680806A1 true EP0680806A1 (en) 1995-11-08
EP0680806B1 EP0680806B1 (en) 1999-10-27

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US (1) US5651719A (en)
EP (1) EP0680806B1 (en)
JP (1) JPH08150555A (en)
DE (1) DE69512956T2 (en)
ES (1) ES2138709T3 (en)
FR (1) FR2719516B1 (en)

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Also Published As

Publication number Publication date
ES2138709T3 (en) 2000-01-16
EP0680806B1 (en) 1999-10-27
FR2719516A1 (en) 1995-11-10
JPH08150555A (en) 1996-06-11
FR2719516B1 (en) 1996-07-26
DE69512956D1 (en) 1999-12-02
DE69512956T2 (en) 2000-06-21
US5651719A (en) 1997-07-29

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