EP0624431A1 - Belt finishing apparatus for cylindrical workpieces - Google Patents

Belt finishing apparatus for cylindrical workpieces Download PDF

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Publication number
EP0624431A1
EP0624431A1 EP94400578A EP94400578A EP0624431A1 EP 0624431 A1 EP0624431 A1 EP 0624431A1 EP 94400578 A EP94400578 A EP 94400578A EP 94400578 A EP94400578 A EP 94400578A EP 0624431 A1 EP0624431 A1 EP 0624431A1
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EP
European Patent Office
Prior art keywords
pads
arm
machined
lining
abrasive cloth
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.)
Granted
Application number
EP94400578A
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German (de)
French (fr)
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EP0624431B1 (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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Publication of EP0624431A1 publication Critical patent/EP0624431A1/en
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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
    • B24B21/004—Machines or devices using grinding or polishing belts; Accessories therefor using abrasive rolled strips

Definitions

  • the present invention relates to a tool for applying abrasive cloth on a machine tool by grinding cylindrical surfaces on parts, in particular pins and crank pins on crankshafts.
  • Machines of this type known for example from patent application EP-A-0 366 506 by the applicant include, for each bearing to be machined on a workpiece, a pivoting and movable arm vertically carrying three pads for applying abrasive cloth arranged substantially at the three angles of an equilateral triangle.
  • a first of these three pads is mounted 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 as to be able to be clamped one against the other by synchronous pivoting in opposition , under the action of a common maneuver.
  • the arm is movable vertically under the action of a balancing cylinder with controlled supply pressure.
  • the abrasive cloth 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 surface condition of the spans.
  • the present invention relates to a tool for the application of abrasive cloth allowing machining by grooming with greater precision on the cylindrical bearing surfaces of parts, in particular the journals and the crankshaft crank pins.
  • the abrasive cloth application tool which is the subject of the present invention is intended for a machine for the machining by grinding of cylindrical bearings on parts, in particular journals and crankshaft pins, machine of the type comprising, for each bearing to machining, a pivoting and vertically movable arm carrying three pads for applying abrasive cloth disposed substantially at the three angles of an equilateral triangle.
  • each of said pads has a concave application surface in an arc extending over an angle greater than 60 ° and less than 120 ° so that the three pads virtually completely enclose the surface to be machined.
  • the three pads apply the abrasive cloth against the surface to be machined, not only each with the same pressure, but also with a practically uniform pressure over their entire angular length. This ensures optimal compensation for any shape defects (ovalization, runout, etc.) of the litter.
  • this shoe is advantageously mounted with limited mobility in horizontal translation perpendicular to the axis of the bearing surface to be machined.
  • each lateral shoe is advantageously mounted with limited mobility in oscillation perpendicular to the axis of the bearing to be machined.
  • each skate comprises a rigid base carrying a lining made of more flexible material, with a low coefficient of fiction.
  • This lining may for example be made of vulcanized synthetic rubber on the base.
  • the lining can advantageously have, along its axis of curvature, a hardness which increases from the middle towards the two ends of the width of the lining.
  • the lining can comprise five sections, namely a middle section of low hardness followed towards each end by an intermediate section of medium hardness itself followed by an end section of high hardness .
  • these three hardnesses can correspond to 90, 95 and 98 Shore.
  • the grinding tool according to the invention is used on a machine according to patent application EP-A-0366 506 for the abrasive machining of cylindrical surfaces on parts, in particular for the machining of crankshaft journals and crank pins.
  • an arm 1 mounted freely pivoting about a horizontal axis on a slide not shown vertically movable.
  • the arm 1 carries two jaws 2a and 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 middle position on the arm 1 and two other shoes 8a and 8b are mounted in the lateral position on the two jaws 2a and 2b so that when the three pads 7, 8a and 8b are tightened, under the action of the jack 5, against the cylindrical surface 6 to be machined, with a view to applying an abrasive cloth 9 against this surface 6, the three pads 7, 8a and 8b are arranged substantially at the three angles of an equilateral triangle and, 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 applied with uniform pressure against the surface 6 to be machined.
  • a balancing means not shown, for example a jack with controlled supply pressure
  • each shoe 7, 8a, 8b extends over an angle slightly less than 120 °, so that the three shoes almost completely envelop the surface 6 to be machined.
  • the upper median shoe 7 is mounted on the arm 1 with limited mobility in horizontal translation perpendicular to the axis of the bearing 6.
  • the two lower lateral pads 8a, 8b are mounted on the jaws 2a and 2b by horizontal axes 12a and 12b with limited mobility in oscillation perpendicular to the axis of the bearing surface 6 to be machined.
  • the mobility of the three pads 7, 8a and 8b ensures optimal adaptation of the pads to the surface of the bearing surface 6 to be machined, independently of the tolerances of the structure of the arm 1 and in particular of the clearances which may occur at the toothed segments 4a, 4b coupling the two jaws 2a and 2b.
  • the upper shoe 7 comprises a rigid base 13, in this case metallic, whose concave inner surface in an arc of a circle carries a lining 14 in a more flexible material, with a low coefficient of fiction, for example vulcanized synthetic rubber.
  • a dovetail profiling 15 improves the connection of the lining 14 with the base 13.
  • the lining 14 can advantageously comprise, along its axis of curvature, several sections of different hardnesses, increasing from the middle of the width towards the two ends. In FIG. 2, these differences in hardness are symbolized by a subdivision of the lining 14 into five sections, namely a middle section 14a, two intermediate sections 14b and two end sections 14c, these sections possibly having hardnesses of 90, 95 and 98 Shore, respectively.
  • the tooling according to the invention could also be used on machines other than those corresponding to patent application EP-A-0366 506, although the latter, due to their structure, lead to machining results. particularly favorable.
  • the pads can have an angular length greater than 60 and less than 120 °, preferably between approximately 90 and 110 °.

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

Abstract

Outillage pour l'application de toile 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, trois patins d'application de toile abrasive disposés sensiblement aux trois angles d'un triangle équilatéral, chaque patin (7, 8) présentant une surface concave s'étendant sur un angle supérieur à 60° et inférieur à 120° de manière que les trois patins de chaque bras enveloppent pratiquement complètement la portée (6) à usiner. <IMAGE>Tools for applying abrasive cloth on a machine for grinding cylindrical surfaces on parts, in particular journals and crank pins on crankshafts, comprising for each surface to be machined, three pads for applying abrasive cloth arranged substantially at three angles of an equilateral triangle, each pad (7, 8) having a concave surface extending over an angle greater than 60 ° and less than 120 ° so that the three pads of each arm almost completely envelop the span (6 ) to machine. <IMAGE>

Description

La présente invention se rapporte à un outillage pour l'application de toile abrasive sur une machine d'usinage par toilage de portées cylindriques sur des pièces, notamment des tourillons et manetons sur des vilebrequins.The present invention relates to a tool for applying abrasive cloth on a machine tool by grinding cylindrical surfaces on parts, in particular pins and crank pins on crankshafts.

Des machines de ce type connues par exemple 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 portant trois patins d'application de toile abrasive disposés sensiblement aux trois angles d'un triangle équilatéral. Un premier de ces trois patins est monté 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 par pivotement synchrone en opposition, sous l'action d'un moyen de manoeuvre commun. Le bras est mobile verticalement sous l'action d'un vérin d'équilibrage à pression d'alimentation contrôlée. Ainsi, lors du serrage des mâchoires, les trois patins appliquent une toile abrasive avec une pression uniforme contre la portée à usiner.Machines of this type known for example from patent application EP-A-0 366 506 by the applicant include, for each bearing to be machined on a workpiece, a pivoting and movable arm vertically carrying three pads for applying abrasive cloth arranged substantially at the three angles of an equilateral triangle. A first of these three pads is mounted 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 as to be able to be clamped one against the other by synchronous pivoting in opposition , under the action of a common maneuver. The arm is movable vertically under the action of a balancing cylinder with controlled supply pressure. Thus, when tightening the jaws, the three pads apply an abrasive cloth with uniform pressure against the surface to be machined.

Sur les machines connues, les patins d'application de toile 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 de surface des portées.On known machines, the abrasive cloth 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 surface condition of the spans.

Il est par ailleurs connu d'utiliser, pour l'usinage par pierrage des portées cylindriques sur des 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 de la portée cylindrique sur la pièce.It is also known to use, for machining by cylindrical bearing surfaces on parts, stones the surface of which in an arc of a circle, in contact with the bearing 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 machining effect by honing the cylindrical bearing on the part.

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 toile abrasive disposés sur deux mâchoires d'une pince, ces deux patins 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 consistent dans une mauvaise répartition de la pression d'application. En effet, cette pression est inévitablement concentrée dans la partie médiane de la longueur angulaire de la surface en arc de cercle des deux patins opposés.Finally, there are also known machining machines by canvas on which the tools in contact with each cylindrical bearing machining include two opposite pads for applying abrasive cloth disposed on two jaws of pliers, these two pads may each have an application surface in an arc extending over 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 angular length of the surface in an arc of a circle of the two opposite pads.

Aucun des outillages connus d'usinage par abrasif ne donne donc entière satisfaction pour pouvoir répondre aux exigences sévères de précision imposées à l'heure actuelle par exemple en ce qui concerne l'absence de défauts de forme et la rectitude des manetons et tourillons de vilebrequins.None of the known tools for abrasive machining is therefore entirely satisfactory in order to be able to meet the severe precision requirements imposed at present, for example with regard to the absence of defects in shape and the straightness of the crank pins and journals. .

La présente invention vise un outillage pour l' application de toile abrasive permettant un usinage par toilage de plus grande précision sur les portées cylindrique de pièces, notamment les tourillons et les manetons de vilebrequins.The present invention relates to a tool for the application of abrasive cloth allowing machining by grooming with greater precision on the cylindrical bearing surfaces of parts, in particular the journals and the crankshaft crank pins.

L'outillage d'application de toile abrasive objet de la présente invention est destiné à une machine pour l'usinage par toilage de portées cylindriques sur des pièces, notamment des tourillons et des manetons de vilebrequins, machine du type comprenant, pour chaque portée à usiner, un bras pivotant et mobile verticalement portant trois patins d'application de toile abrasive disposés sensiblement aux trois angles d'un triangle équilatéral. Selon l'invention, chacun desdits patins présente une surface d'application concave en arc de cercle s'étendant sur un angle supérieur à 60° et inférieur à 120° de manière que les trois patins enveloppent pratiquement complètement la portée à usiner.
Grâce à leur forme enveloppante sur légèrement moins de 120° et à leur montage particulier sur le bras, les trois patins appliquent la toile abrasive contre la portée à usiner non seulement chacun avec la même pression, mais encore avec une pression pratiquement uniforme sur toute leur longueur angulaire. Cela assure une compensation optimale des éventuels défauts de forme (ovalisation, faux-rond, etc) de la portée.The abrasive cloth application tool which is the subject of the present invention is intended for a machine for the machining by grinding of cylindrical bearings on parts, in particular journals and crankshaft pins, machine of the type comprising, for each bearing to machining, a pivoting and vertically movable arm carrying three pads for applying abrasive cloth disposed substantially at the three angles of an equilateral triangle. According to the invention, each of said pads has a concave application surface in an arc extending over an angle greater than 60 ° and less than 120 ° so that the three pads virtually completely enclose the surface to be machined.
Thanks to their enveloping shape over slightly less than 120 ° and their particular mounting on the arm, the three pads apply the abrasive cloth against the surface to be machined, not only each with the same pressure, but also with a practically uniform pressure over their entire angular length. This ensures optimal compensation for any shape defects (ovalization, runout, etc.) of the litter.

Pour permettre, sur un bras d'une machine suivant la demande EP-A-0 366 506, une adaptation optimale du patin supérieur par rapport à la portée à usiner, ce patin est avantageusement monté avec une mobilité limitée en translation horizontale perpendiculairement à l'axe de la portée à usiner.To allow, on an arm of a machine according to request EP-A-0 366 506, an optimal adaptation of the upper shoe relative to the scope to be machined, this shoe is advantageously mounted with limited mobility in horizontal translation perpendicular to the axis of the bearing surface to be machined.

Par ailleurs, sur ce même type de machine, chaque patin latéral est avantageusement monté avec une mobilité limitée en oscillation perpendiculairement à l'axe de la portée à usiner.Furthermore, on this same type of machine, each lateral shoe is advantageously mounted with limited mobility in oscillation perpendicular to the axis of the bearing to be machined.

De préférence, chaque patin comprend une embase rigide portant une garniture en matière plus souple, à faible coefficient de fiction.Preferably, each skate comprises a rigid base carrying a lining made of more flexible material, with a low coefficient of fiction.

Cette garniture peut par exemple être constituée d'un caoutchouc synthétique vulcanisé sur l'embase.This lining may for example be made of vulcanized synthetic rubber on the base.

La garniture peut avantageusement présenter suivant son axe de courbure une dureté allant en augmentant depuis le milieu vers les deux extrémités de la largeur de la garniture.The lining can advantageously have, along its axis of curvature, a hardness which increases from the middle towards the two ends of the width of the lining.

Ainsi, suivant un mode de réalisation préféré, la garniture peut comprendre cinq sections, à savoir une section médiane de faible dureté suivie vers chaque extrémité d'une section intermédiaire de dureté moyenne elle-même suivie d'une section d'extrémité de grande dureté.Thus, according to a preferred embodiment, the lining can comprise five sections, namely a middle section of low hardness followed towards each end by an intermediate section of medium hardness itself followed by an end section of high hardness .

A titre d'exemple, ces trois duretés peuvent correspondre à 90, 95 et 98 Shore.By way of example, these three hardnesses can correspond to 90, 95 and 98 Shore.

En se référant aux dessins schématiques annexés, on va décrire ci-après plus en détail un mode de réalisation illustratif et non limitatif d'un outillage de toilage conforme à l'invention; sur les dessins :

  • la figure 1 est une vue d'ensemble de la partie inférieure d'un bras de toilage portant l'outillage de toilage suivant la présente invention;
  • la figure 2 est une coupe partielle d'un porteur à plus grande échelle suivant II-II de la figure 1.
Referring to the accompanying schematic drawings, an illustrative and nonlimiting embodiment of a grooming tool according to the invention will be described below in more detail; on the drawings:
  • Figure 1 is an overall view of the lower part of a grooming arm carrying the grooming tool according to the present invention;
  • FIG. 2 is a partial section of a carrier on a larger scale along II-II of FIG. 1.

Tel qu'illustré par les dessins, l'outillage de toilage conforme à l'invention est utilisé sur une machine suivant la demande de brevet EP-A-0366 506 pour l'usinage par abrasif de portées cylindriques sur des pièces, notamment pour l'usinage par toilage des tourillons et manetons de vilebrequins. Sur la figure 1, on reconnaît 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 et 2b articulées par des axes horizontaux 3a et 3b sur le bras 1 et couplés 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.As illustrated by the drawings, the grinding tool according to the invention is used on a machine according to patent application EP-A-0366 506 for the abrasive machining of cylindrical surfaces on parts, in particular for the machining of crankshaft journals and crank pins. In Figure 1, we recognize an arm 1 mounted freely pivoting about a horizontal axis on a slide not shown vertically movable. The arm 1 carries two jaws 2a and 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 de la portée cylindrique 6, un premier patin 7 est monté en position médiane sur le bras 1 et deux autres patins 8a et 8b sont montés en position latérale sur les deux mâchoires 2a et 2b de telle manière que lorsque les trois patins 7, 8a et 8b sont serrés, sous l'action du vérin 5, contre la portée cylindrique 6 à usiner, en vue de l'application contre cette portée 6 d'une toile abrasive 9, les trois patins 7, 8a et 8b soient disposés sensiblement aux trois angles d'un triangle équilatéral et, 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 soient appliqués avec une pression uniforme contre la portée 6 à usiner.With a view to machining the cylindrical seat 6 by grooming, a first shoe 7 is mounted in the middle position on the arm 1 and two other shoes 8a and 8b are mounted in the lateral position on the two jaws 2a and 2b so that when the three pads 7, 8a and 8b are tightened, under the action of the jack 5, against the cylindrical surface 6 to be machined, with a view to applying an abrasive cloth 9 against this surface 6, the three pads 7, 8a and 8b are arranged substantially at the three angles of an equilateral triangle and, 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 applied with uniform pressure against the surface 6 to be machined.

Selon l'invention, chaque patin 7, 8a, 8b s'étend sur un angle légèrement inférieur à 120°, de manière que les trois patins enveloppent pratiquement complètement la portée 6 à usiner.According to the invention, each shoe 7, 8a, 8b extends over an angle slightly less than 120 °, so that the three shoes almost completely envelop the surface 6 to be machined.

Comme indiqué par une flèche double 10, le patin 7 médian supérieur est monté sur le bras 1 avec une mobilité limitée en translation horizontale perpendiculairement à l'axe de la portée 6. De leur côté, comme indiqué par des flèches doubles 11a et 11b, les deux patins 8a, 8b latéraux inférieurs sont montés sur les mâchoires 2a et 2b par des axes horizontaux 12a et 12b avec une mobilité limitée en oscillation perpendiculairement à l'axe de la portée 6 à usiner. La mobilité des trois patins 7, 8a et 8b assure une adaptation optimale des patins à la surface de la portée 6 à usiner, indépendamment des tolérances de la structure du bras 1 et notamment des jeux pouvant survenir au niveau des segments dentés 4a, 4b couplant les deux mâchoires 2a et 2b.As indicated by a double arrow 10, the upper median shoe 7 is mounted on the arm 1 with limited mobility in horizontal translation perpendicular to the axis of the bearing 6. On their side, as indicated by double arrows 11a and 11b, the two lower lateral pads 8a, 8b are mounted on the jaws 2a and 2b by horizontal axes 12a and 12b with limited mobility in oscillation perpendicular to the axis of the bearing surface 6 to be machined. The mobility of the three pads 7, 8a and 8b ensures optimal adaptation of the pads to the surface of the bearing surface 6 to be machined, independently of the tolerances of the structure of the arm 1 and in particular of the clearances which may occur at the toothed segments 4a, 4b coupling the two jaws 2a and 2b.

Tel que cela apparaît surtout sur la figure 2, le patin supérieur 7 comprend une embase 13 rigide, en l'occurence métallique, dont la surface intérieure concave en arc de cercle porte une garniture 14 en une matière plus souple, à faible coefficient de fiction, par exemple un caoutchouc synthétique vulcanisé. Un profilage 15 en queue d'aronde améliore la liaison de la garniture 14 avec l'embase 13.As it appears above all in FIG. 2, the upper shoe 7 comprises a rigid base 13, in this case metallic, whose concave inner surface in an arc of a circle carries a lining 14 in a more flexible material, with a low coefficient of fiction, for example vulcanized synthetic rubber. A dovetail profiling 15 improves the connection of the lining 14 with the base 13.

Etant donné que l'usinage par toilage de la portée cylindrique 6 fait intervenir, non seulement un mouvement de rotation de la portée 6, mais également, de façon connue en soi, un mouvement d'oscillation de la portée 6 suivant son axe (en vue de l'obtention d'un dessin d'usinage croisé), et que la largeur de chaque patin 7, 8 est inférieure à la largeur de la portée 6 à usiner, les deux parties d'extrémité de la largeur de la portée 6 ne subissent qu'un usinage alterné alors que la partie médiane est soumise à un usinage permanent, ce qui peut conduire à des défauts de rectitude de la portée. Pour compenser de tels défauts de rectitude, la garniture 14 peut avantageusement comprendre, suivant son axe de courbure, plusieurs sections de duretés différentes, allant en augmentant depuis le milieu de la largeur vers les deux extrémités. Sur la figure 2, ces différences de dureté sont symbolisées par une subdivision de la garniture 14 en cinq sections, à savoir une section médiane 14a, deux sections intermédiaires 14b et deux sections d'extrémité 14c, ces sections pouvant avoir par exemple des duretés de 90, 95 et 98 Shore, respectivement.Since the machining by linen of the cylindrical surface 6 involves not only a rotational movement of the surface 6, but also, in a manner known per se, an oscillating movement of the surface 6 along its axis (in view of obtaining a crossed machining drawing), and that the width of each pad 7, 8 is less than the width of the bearing surface 6 to be machined, the two end portions of the width of the bearing surface 6 only undergo alternating machining while the middle part is subjected to permanent machining, which can lead to defects in straightness of the bearing. To compensate for such defect in straightness, the lining 14 can advantageously comprise, along its axis of curvature, several sections of different hardnesses, increasing from the middle of the width towards the two ends. In FIG. 2, these differences in hardness are symbolized by a subdivision of the lining 14 into five sections, namely a middle section 14a, two intermediate sections 14b and two end sections 14c, these sections possibly having hardnesses of 90, 95 and 98 Shore, respectively.

Il va de soi que le mode de réalisation et décrit n'a été donné qu'à titre d'exemple indicatif 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 and described has been given only by way of an indicative and nonlimiting example and that numerous modifications and variants are possible within the scope of the invention.

Ainsi, l'outillage conforme à l'invention pourrait être utilisé également sur des machines autres que celles correspondant à la demande brevet EP-A-0366 506, bien que ces dernières, du fait de leur structure, conduisent à des résultats d'usinage particulièrement favorables.Thus, the tooling according to the invention could also be used on machines other than those corresponding to patent application EP-A-0366 506, although the latter, due to their structure, lead to machining results. particularly favorable.

Par ailleurs, il convient de noter que dans le cadre de l'invention, les patins peuvent avoir une longueur angulaire supérieure à 60 et inférieure à 120°, de préférence comprise entre environ 90 et 110°.Furthermore, it should be noted that in the context of the invention, the pads can have an angular length greater than 60 and less than 120 °, preferably between approximately 90 and 110 °.

Claims (5)

Outillage pour l'application de toile 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 toile 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 chacun des trois patins (7, 8) présente une surface concave d'application de toile abrasive s'étendant sur un angle supérieur à 60° de manière que lors du serrage, les trois patins de chaque bras enveloppent pratiquement complètement la portée (6) à usiner, que le patin supérieur médian (7) est monté sur le bras (1) avec une mobilité limitée en translation horizontale perpendiculairement à l'axe de la portée (6), et que les deux patins latéraux inférieurs (8a, 8b) sont montés chacun sur sa mâchoire (2a, 2b) avec une mobilité limitée en oscillation transversalement à l'axe de la portée (6).Tools for applying abrasive cloth on a machine for grinding cylindrical bearings on parts, in particular journals and crank pins on crankshafts, comprising, for each bearing (6) to be machined, a pivoting arm (1) and vertically movable, and three pads (7, 8) for applying abrasive cloth 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, so 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 each of the three pads (7, 8) has a concave surface for applying abrasive cloth extending over an angle greater than 60 ° so that when tightening, the three pads of each arms practically wrap c Completely the scope (6) to be machined, that the upper median pad (7) is mounted on the arm (1) with limited mobility in horizontal translation perpendicular to the axis of the scope (6), and that the two lateral pads lower (8a, 8b) are each mounted on its jaw (2a, 2b) with limited mobility in oscillation transverse to the axis of the bearing (6). Outillage suivant la revendication 1, caractérisé par le fait que chaque patin (7, 8) comprend une embase rigide (13) et une garniture (14) en matière plus souple, à faible coefficient de friction.Tooling according to claim 1, characterized in that each shoe (7, 8) comprises a rigid base (13) and a lining (14) made of more flexible material, with a low coefficient of friction. Outillage suivant la revendication 2, caractérisé par le fait que la garniture (14) est constituée par du caoutchouc synthétique vulcanisé.Tool according to claim 2, characterized in that the lining (14) consists of vulcanized synthetic rubber. Outillage suivant la revendication 2 ou 3, caractérisé par le fait que la garniture (14) comprend, suivant l'axe de courbure, plusieurs sections (14a, 14b, 14c) de duretés différentes allant en augmentant depuis le milieu de la largeur vers les deux extrémités.Tool according to claim 2 or 3, characterized in that the lining (14) comprises, along the axis of curvature, several sections (14a, 14b, 14c) of different hardnesses increasing from the middle of the width towards the two ends. Outillage suivant la revendication 4, caractérisé par le fait que la garniture (14) comprend une section médiane (14a) de faible dureté suivie vers chaque extrémité de deux sections intermédiaires (14b) de dureté moyenne elles-mêmes suivies de deux sections d'extrémité (14c) de dureté élevée.Tool according to claim 4, characterized in that the lining (14) comprises a middle section (14a) of small hardness followed towards each end by two intermediate sections (14b) of medium hardness themselves followed by two end sections (14c) of high hardness.
EP94400578A 1993-03-18 1994-03-17 Belt finishing apparatus for cylindrical workpieces Expired - Lifetime EP0624431B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9303156A FR2702693B1 (en) 1993-03-18 1993-03-18 Tools for applying abrasive cloth on a machining machine by grinding cylindrical surfaces on parts.
FR9303156 1993-03-18

Publications (2)

Publication Number Publication Date
EP0624431A1 true EP0624431A1 (en) 1994-11-17
EP0624431B1 EP0624431B1 (en) 1998-05-27

Family

ID=9445126

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Application Number Title Priority Date Filing Date
EP94400578A Expired - Lifetime EP0624431B1 (en) 1993-03-18 1994-03-17 Belt finishing apparatus for cylindrical workpieces

Country Status (6)

Country Link
US (1) US5522762A (en)
EP (1) EP0624431B1 (en)
JP (1) JPH0752005A (en)
DE (1) DE69410527T2 (en)
ES (1) ES2116549T3 (en)
FR (1) FR2702693B1 (en)

Cited By (2)

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Publication number Priority date Publication date Assignee Title
DE19602974A1 (en) * 1996-01-27 1997-07-31 Thielenhaus Ernst Kg Finish grinding machine for bearing surfaces of shafts
CN111496637A (en) * 2019-01-30 2020-08-07 辽宁五一八内燃机配件有限公司 Device and method capable of reducing roughness value of crankshaft journal fillet

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FR2758756B1 (en) * 1997-01-30 1999-02-26 Procede Machines Speciales Spm MACHINE ASSEMBLY BY ABRASIVE BELT OF A CYLINDRICAL RANGE OF A WORKPIECE
DE19850216A1 (en) * 1998-10-31 2000-05-04 Nagel Masch Werkzeug Method and device for fine machining of essentially cylindrical workpiece surfaces
FR2808463B1 (en) * 2000-05-04 2002-09-13 Procedes Et Machines Speciales ABRASIVE TAPE MACHINE FOR CYLINDRICAL DOORS ON PARTS
DE602004001467T2 (en) 2003-02-12 2006-11-16 Nissan Motor Co., Ltd., Yokohama Apparatus and method for surface finishing
FR2872726B1 (en) * 2004-07-08 2007-11-23 Societes Des Procedes Et Machi SUPERFINITION DEVICE AND ASSOCIATED METHOD
US7169028B1 (en) * 2005-11-02 2007-01-30 Barton Ii Kenneth A Flexible finishing shoe
EP2399706B9 (en) * 2010-06-22 2013-10-02 Supfina Grieshaber GmbH & Co. KG Finishing device for finishing the surfaces of workpieces
EP2650081B1 (en) * 2012-04-13 2013-11-27 Supfina Grieshaber GmbH & Co. KG Method and device for finishing a workpiece surface
JP6037510B2 (en) * 2013-04-09 2016-12-07 尚一 島田 Processing equipment

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DE8602817U1 (en) * 1986-02-04 1986-04-10 Maschinenbau Grieshaber GmbH & Co, 77709 Wolfach Device for machining bearing journals of crankshafts or the like.
EP0219301A2 (en) * 1985-10-08 1987-04-22 Industrial Metal Products Corporation Improved microfinishing apparatus and method
EP0338224A2 (en) * 1988-04-21 1989-10-25 Ford-Werke Aktiengesellschaft Device for finishing pins of crankshafts
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DE8602817U1 (en) * 1986-02-04 1986-04-10 Maschinenbau Grieshaber GmbH & Co, 77709 Wolfach Device for machining bearing journals of crankshafts or the like.
EP0338224A2 (en) * 1988-04-21 1989-10-25 Ford-Werke Aktiengesellschaft Device for finishing pins of crankshafts
EP0366506A1 (en) * 1988-09-27 1990-05-02 Societe Des Procedes Machines Speciales Device for abrasive machining of cylindrical bearing surfaces of workpieces, in particular for belt grinding of crankshaft journals and pins
US4993191A (en) * 1989-04-28 1991-02-19 Industrial Metal Products Corporation Roller cam microfinishing tooling

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19602974A1 (en) * 1996-01-27 1997-07-31 Thielenhaus Ernst Kg Finish grinding machine for bearing surfaces of shafts
CN111496637A (en) * 2019-01-30 2020-08-07 辽宁五一八内燃机配件有限公司 Device and method capable of reducing roughness value of crankshaft journal fillet
CN111496637B (en) * 2019-01-30 2022-04-05 辽宁五一八内燃机配件有限公司 Device and method capable of reducing roughness value of crankshaft journal fillet

Also Published As

Publication number Publication date
JPH0752005A (en) 1995-02-28
DE69410527T2 (en) 1998-09-17
DE69410527D1 (en) 1998-07-02
FR2702693A1 (en) 1994-09-23
EP0624431B1 (en) 1998-05-27
ES2116549T3 (en) 1998-07-16
FR2702693B1 (en) 1995-05-24
US5522762A (en) 1996-06-04

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