EP0856379A1 - Grinding belt assembly for machining a cylindrical bearing surface on a workpiece - Google Patents
Grinding belt assembly for machining a cylindrical bearing surface on a workpiece Download PDFInfo
- Publication number
- EP0856379A1 EP0856379A1 EP98400201A EP98400201A EP0856379A1 EP 0856379 A1 EP0856379 A1 EP 0856379A1 EP 98400201 A EP98400201 A EP 98400201A EP 98400201 A EP98400201 A EP 98400201A EP 0856379 A1 EP0856379 A1 EP 0856379A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- jaw
- jaws
- keys
- machined
- reaction
- 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.)
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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
- 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
-
- 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
- B24B35/00—Machines or devices designed for superfinishing surfaces on work, i.e. by means of abrading blocks reciprocating with high frequency
-
- 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
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/04—Headstocks; Working-spindles; Features relating thereto
-
- 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 machining assembly by abrasive belt of a cylindrical bearing of a part, in particular a crank pin or crank pin, of the type comprising two opposite jaws that can be clamped against the work surface to apply an abrasive strip against the latter during the workpiece rotation.
- each jaw carries two mounted sanding pads elastically on the jaw and each extending at an angle between 15 and 45 ° from the circumference of the surface to be machined.
- This machining assembly has many disadvantages among which must be mentioned in particular the poor distribution of pressures on the four pads, the limited contact angle of the pads, therefore abrasive belt, with the surface to be machined, hence the impossibility to carry out machining which not only provides a good state of surface, but also compensation for any defects in shape of the scope, and the lack of integrated means of monitoring the diameter of the bearing surface during machining.
- the present invention relates to a strip machining assembly abrasive of a cylindrical bearing of a part, in particular of a journal and / or crankshaft pin, assembly which, while being of simple structure, optimally meets the requirements imposed in this area, from the point of view of machining precision and compensation for form defects.
- the invention further relates to a assembly by abrasive belt machining of a cylindrical part of a piece, incorporating means for checking the diameter of the span during machining.
- the machining assembly according to the invention by strip abrasive of a cylindrical bearing of a part, in particular of a crankshaft journal or crankpin includes two jaws opposites that can be clamped against the surface to be machined to apply an abrasive strip against the latter during the rotation of the room.
- a first of said jaws carries a shoe having a rigid, concave bearing surface, in cylinder sector, shaped adapted to that of the surface to be machined, with means immobilizing an abrasive strip with respect to said surface support during machining.
- the second jaw carries two litters or reaction keys spaced apart from each other circumferential of the seat to be machined and oriented parallel to the axis of the span to be machined.
- the hoof arrangement of the first jaw and two reaction keys on the second jaw is such that when clamping jaws on the surface to be machined, the shoe applies the abrasive strip against the surface to be machined at a circumferential angle preferably between 120 ° and less than 180 ° and the two keys are applied directly against the work surface along two generators of the latter spaced from each other a circumferential angle preferably between 60 ° and 120 °.
- the abrasive belt can be immobilized relative to the support surface of the shoe by adhesive, the strip being glued to the bearing surface, or preferably by controlled clamping means, arranged on either side of the shoe, at the closer to the latter, which allows the abrasive to be renewed by simple advancement of the strip between two machining operations.
- the two reaction keys can be skates, but to reduce the friction of feedback keys on the staff at machine, it is advantageous to use two rollers mounted on the second jaw so that the axes of the rollers are parallel to the axis of the span to be machined.
- reaction keys may have a axial mobility relative to their jaw. So the keys of reaction can participate by friction in the oscillatory movement in axial translation that the bearing undergoes, in a manner known per se, in more than its rotation, during its machining by abrasive belt.
- the machining assembly according to the invention may include, in addition, integrated means for checking the diameter of the bearing surface machining courses.
- the second jaw carries in this case, in addition to two feedback keys, two measuring keys mounted so movable on the second jaw so that it can be moved apart from each other and be brought together to be applied, in the machining position, in diametrically positions opposite against the surface to be machined.
- the second jaw has, in addition, advantageously means for removing the two keys dc measures from each other when the jaws are not tight and to bring them closer to each other when the jaws are tight.
- said means for removing and bringing the two measurement keys closer to each other can be directly actuated by the opening and closing movement jaws, or be ordered according to this movement for their spacing and approximation.
- machining with an abrasive belt a cylindrical bearing surface 1 of a part is effected by an assembly which can be part of a machine comprising multiple assemblies for simultaneously machining multiple spans of the same part, for example of several pins and / or crankpins of a crankshaft.
- an assembly which can be part of a machine comprising multiple assemblies for simultaneously machining multiple spans of the same part, for example of several pins and / or crankpins of a crankshaft.
- the set essentially includes a first jaw 3 which is pivotally mounted about an axis 2, and a second jaw 5 pivotally mounted about a horizontal axis 6 on the first jaw 3, the balancing of the assembly being ensured by a balancing cylinder 4.
- a cylinder 7 ensures the tightening and loosening of the two jaws 3 and 5 and a locking system comprising a ramp 8 which cooperates with the jaw 5 under the action of a jack 9 is provided to block the two jaws 3, 5 irreversibly in tight position. This allows in particular to improve the geometry of the reach, the jaws can not move apart to "cross" flaw shape defects during machining.
- the first jaw 3 carries a shoe 10 having, on the side facing the bearing surface 1 to be machined, a concave bearing surface 11, rigid, in cylinder sector, of shape adapted to that of the range 1 to machining, the axial length of the bearing surface 11 being less than the axial length of the bearing surface 1 to be machined.
- shoe 10 may be made of steel, the bearing surface 11 being precisely ground.
- the bearing surface 11 in the cylinder sector extends over a circumferential angle of approximately 130 °.
- the jaw 3 On either side of the shoe 10, the jaw 3 carries a device 12 for clamping an abrasive belt 13 which, unwound from a reserve 14 passes through the first clamping device 12, on the surface support 11 of shoe 10, by the second clamping device 12 and there on a winding device 15.
- the second jaw 5 carries a reaction support 16 having a shape substantially corresponding to that of the shoe 10 of the first jaw 3, but having two reaction rollers 17, mounted in rotation on the support 16, their axes being parallel to the axis of the bearing surface 1 to be machined, so that the two rollers 17 somewhat exceed the concave surface in cylinder sector that the support 16 present on the side facing the bearing 1.
- the two rollers 17 have a diameter less than diameter of the bearing surface 1 and are mounted on the support 16 so that when tightening the two jaws 3 and 5 against the bearing 1, the two rollers 17 are applied directly against the following surface 1 two generators of the latter spaced from each other by an angle circumferential of the order of 90 °.
- the jaw 5 also carries two measuring keys 18 which are fixed, on both sides of the reaction support 16, on axes 19 parallel to the axis of the span so that one of them can be moved apart each other and be brought together to be applied in diametrically opposite positions against the surface 1 to be machined.
- two measuring keys 18 are fixed, on both sides of the reaction support 16, on axes 19 parallel to the axis of the span so that one of them can be moved apart each other and be brought together to be applied in diametrically opposite positions against the surface 1 to be machined.
- these means can either be directly actuated by the opening and closing movement of the jaws, either be ordered according to this movement.
- Two jaws 103 and 105 are pivotally mounted around axes 101 and 102 on a common support 100, the balancing of the assembly being ensured by a jack 104.
- the arrangement is chosen to so that the jaws 103 and 105 can be moved apart each other and be brought together for tightening against the scope 1 to be machined, by "horizontal” movements rather than by “vertical” movements as is the case for the jaws of the embodiment of FIG. 1.
- These movements are controlled by a jack 107 acting on the jaw 103, the two jaws 103 and 105 being coupled by pinions 106.
- a locking system comprising a ramp 108 which cooperates with the jaw 105 under the action of a jack 109 is provided to block the two jaws 103 and 105 irreversibly in the closed position.
- the first jaw 103 carries a shoe 110 having, on the side facing the surface 1 to be machined, a rigid support surface 111, concave, in cylinder sector, of a shape adapted to that of the bearing 1 to be machined.
- the jaw 103 On both sides of the shoe 110, the jaw 103 carries a device 12 for clamping an abrasive strip 113 which, unwound from a reserve not shown, passes through the first clamping device 112, on the bearing surface 111 of the shoe 110, by the second device tightening 112 and is then rewound on a winding device not shown.
- the second jaw 105 consists of two jaws partial 105a and 105b juxtaposed (see especially Figure 3).
- the partial jaw 105a is coupled (pinions 106) with the jaw 103, while the partial jaw 105b is driven by the jaw 105a passing through a spring 114.
- the partial jaw 105a carries a reaction support 116 comprising two reaction rollers 117 mounted for rotation on the support 116, their axes being parallel to the axis of the bearing surface 1 to be machined.
- the two rollers 117 are spaced from each other so as to be applied against the surface 1 to be machined along two generators of this last spaced from each other by a circumferential angle less than 90 °, in this case an angle of the order of 75 °.
- the partial jaw 105b carries two measurement keys 118 mounted so that they can pivot around axes 119 parallel to the axis of the scope 1, in order to be able to be separated from one another and to be reconciled to each other for application, in diametrically opposite positions, against the surface 1 to be machined.
- the spreading and closing movements of the reaction keys 118 are produced by actuation means 120 controlled by function of the clamping and loosening movement of the jaws 103, 105.
- the support 100 carries a stop 121 against which the partial jaw 105b, driven by the partial jaw 105a, comes to bear when tightening the two jaws 103, 105, the stop 121 thus defining the position in which the two keys 110 are applied against the surface 1 to be machined.
- rollers 17, 117 could be replaced by non-rotating staves or keys, in the form of skates, although rollers reduce friction with the seat 1 during the rotation.
- reaction rollers 17, 117 can be moved by axial translation relative to the jaw 5, 105, this in order to follow the oscillatory movement in axial translation that the bearing 1 undergoes at during its machining by the abrasive belt 13, 113, in addition to its rotation, as is well known for abrasive machining, including superfinishing.
- Another possibility would be to make the jaw 5, 105 movable axially relative to jaw 3, 103, and to make it "fit" in the crankshaft, between the two parts delimiting the range 1 to be machined, so that the rollers 17, 117 are directly entrained by the workpiece in its oscillatory movement of axial translation.
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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)
- Clamps And Clips (AREA)
Abstract
Description
La présente invention se rapporte à un ensemble d'usinage par bande abrasive d'une portée cylindrique d'une pièce, notamment d'un tourillon ou d'un maneton de vilebrequin, du type comprenant deux mâchoires opposées pouvant être serrées contre la portée à usiner pour appliquer une bande abrasive contre cette dernière pendant la rotation de la pièce.The present invention relates to a machining assembly by abrasive belt of a cylindrical bearing of a part, in particular a crank pin or crank pin, of the type comprising two opposite jaws that can be clamped against the work surface to apply an abrasive strip against the latter during the workpiece rotation.
Des ensembles de ce type sont connus, par exemple, par le modèle d'utilité DE 86 01 817. Suivant ce document, chaque mâchoire porte deux patins d'application de bande abrasive montés élastiquement sur la mâchoire et s'étendant chacun sur un angle compris entre 15 et 45° de la circonférence de la portée à usiner. Cet ensemble d'usinage présente de nombreux inconvénients parmi lesquels il faut citer en particulier la mauvaise répartition des pressions sur les quatre patins, l'angle de contact limité des patins, donc de la bande abrasive, avec la portée à usiner, d'où l'impossibilité de réaliser un usinage qui, procure non seulement un bon état de surface, mais également une compensation d'éventuels défauts de forme de la portée, et l'absence de moyens intégrés de contrôle du diamètre de la portée en cours d'usinage.Sets of this type are known, for example, from utility model DE 86 01 817. According to this document, each jaw carries two mounted sanding pads elastically on the jaw and each extending at an angle between 15 and 45 ° from the circumference of the surface to be machined. This machining assembly has many disadvantages among which must be mentioned in particular the poor distribution of pressures on the four pads, the limited contact angle of the pads, therefore abrasive belt, with the surface to be machined, hence the impossibility to carry out machining which not only provides a good state of surface, but also compensation for any defects in shape of the scope, and the lack of integrated means of monitoring the diameter of the bearing surface during machining.
Par le document FR-A-2 702 693 (= US-A-5 522 762), on connaít un ensemble d'usinage faisant intervenir trois patins d'application de bande abrasive s'étendant chacun sur un angle compris entre 60° et 120° et disposés sensiblement aux trois angles d'un triangle équilatéral. Cet ensemble d'usinage, malgré les avantages qu'il procure par rapport à un ensemble de quatre patins d'application, ne donne pas toujours satisfaction en ce qui concerne la compensation des défauts de forme de la portée à usiner.By the document FR-A-2 702 693 (= US-A-5 522 762), we knows a set of machining involving three pads applying an abrasive band each extending over an angle included between 60 ° and 120 ° and arranged substantially at the three angles of a equilateral triangle. This machining assembly, despite the advantages it compared to a set of four application pads, does not not always satisfactory with regard to compensation for defect in shape of the bearing surface to be machined.
Le document FR-A-2 719 516 (= US-A-5 651 719) concerne un ensemble d'usinage qui reprend la structure générale de l'ensemble suivant le document précédent, mais est muni de moyens de contrôle du diamètre de la portée pendant son usinage.Document FR-A-2 719 516 (= US-A-5 651 719) concerns a machining assembly which takes up the general structure of the assembly according to the previous document, but is provided with control means the diameter of the seat during its machining.
Néanmoins, ces ensembles d'usinage connus ne sont pas à même de répondre pleinement à toutes les exigences imposées à l'heure actuelle en ce qui concerne notamment l'usinage des tourillons et manetons des vilebrequins de moteurs automobiles.However, these known machining assemblies are not even fully meet all the requirements imposed on the present time with regard to the machining of the journals and crankshafts of automobile engine crankshafts.
La présente invention vise un ensemble d'usinage par bande abrasive d'une portée cylindrique d'une pièce, notamment d'un tourillon et/ou d'un maneton de vilebrequin, ensemble qui, tout en étant de structure simple, répond de façon optimale aux exigences imposées dans ce domaine, du point de vue précision d'usinage et compensation des défauts de forme. L'invention vise par ailleurs un ensemble d'usinage par bande abrasive d'une partie cylindrique d'une pièce, intégrant des moyens de contrôle du diamètre de la portée pendant l'usinage.The present invention relates to a strip machining assembly abrasive of a cylindrical bearing of a part, in particular of a journal and / or crankshaft pin, assembly which, while being of simple structure, optimally meets the requirements imposed in this area, from the point of view of machining precision and compensation for form defects. The invention further relates to a assembly by abrasive belt machining of a cylindrical part of a piece, incorporating means for checking the diameter of the span during machining.
L'ensemble d'usinage conforme à l'invention par bande abrasive d'une portée cylindrique d'une pièce, notamment d'un tourillon ou maneton de vilebrequin, comprend deux mâchoires opposées pouvant être serrées contre la portée à usiner pour appliquer une bande abrasive contre cette dernière pendant la rotation de la pièce. Une première desdites mâchoires porte un sabot ayant une surface d'appui rigide, concave, en secteur de cylindre, de forme adaptée à celle de la portée à usiner, avec des moyens d'immobilisation d'une bande abrasive par rapport à ladite surface d'appui pendant l'usinage. La seconde mâchoire porte deux portées ou touches de réaction espacées l'une de l'autre dans le sens circonférentiel de la portée à usiner et orientées parallèlement à l'axe de la portée à usiner. L'agencement du sabot de la première mâchoire et des deux touches de réaction de la seconde mâchoire est tel que lors du serrage dcs mâchoires sur la portée à usiner, le sabot applique la bande abrasive contre la portée à usiner sur un angle circonférentiel compris de préférence entre 120° et moins de 180° et les deux touches de réaction soient appliquées directement contre la portée à usiner suivant deux génératrices de cette dernière espacées l'une de l'autre d'un angle circonférentiel de préférence compris entre 60° et 120°.The machining assembly according to the invention by strip abrasive of a cylindrical bearing of a part, in particular of a crankshaft journal or crankpin, includes two jaws opposites that can be clamped against the surface to be machined to apply an abrasive strip against the latter during the rotation of the room. A first of said jaws carries a shoe having a rigid, concave bearing surface, in cylinder sector, shaped adapted to that of the surface to be machined, with means immobilizing an abrasive strip with respect to said surface support during machining. The second jaw carries two litters or reaction keys spaced apart from each other circumferential of the seat to be machined and oriented parallel to the axis of the span to be machined. The hoof arrangement of the first jaw and two reaction keys on the second jaw is such that when clamping jaws on the surface to be machined, the shoe applies the abrasive strip against the surface to be machined at a circumferential angle preferably between 120 ° and less than 180 ° and the two keys are applied directly against the work surface along two generators of the latter spaced from each other a circumferential angle preferably between 60 ° and 120 °.
Dans le cadre de l'invention, la bande abrasive peut être immobilisée par rapport à la surface d'appui du sabot par adhésif, la bande étant collée à la surface d'appui, ou de préférence par des moyens de serrage commandés, disposés de part et d'autre du sabot, au plus près de ce dernier, ce qui permet de renouveler l'abrasif par simple avancement de la bande entre deux usinages.In the context of the invention, the abrasive belt can be immobilized relative to the support surface of the shoe by adhesive, the strip being glued to the bearing surface, or preferably by controlled clamping means, arranged on either side of the shoe, at the closer to the latter, which allows the abrasive to be renewed by simple advancement of the strip between two machining operations.
Les deux touches de réaction peuvent être des patins, mais pour réduire le frottement des touches de réaction sur la portée à usiner, il est avantageux d'utiliser deux galets montés sur la deuxième mâchoire de manière que les axes des galets soient parallèles à l'axe de la portée à usiner.The two reaction keys can be skates, but to reduce the friction of feedback keys on the staff at machine, it is advantageous to use two rollers mounted on the second jaw so that the axes of the rollers are parallel to the axis of the span to be machined.
Toujours pour réduire le frottement des touches de réaction sur la portée à usiner, les touches de réaction peuvent présenter une mobilité axiale par rapport à leur mâchoire. Ainsi, les touches de réaction peuvent participer par frottement au mouvement oscillatoire en translation axiale que la portée subit, de façon connue en soi, en plus de sa rotation, pendant son usinage par bande abrasive.Always to reduce the friction of reaction keys on the range to be machined, the reaction keys may have a axial mobility relative to their jaw. So the keys of reaction can participate by friction in the oscillatory movement in axial translation that the bearing undergoes, in a manner known per se, in more than its rotation, during its machining by abrasive belt.
L'ensemble d'usinage conforme à l'invention peut comporter, en outre, des moyens intégrés de contrôle du diamètre de la portée en cours d'usinage. La deuxième mâchoire porte dans ce cas, en plus des deux touches de réaction, deux touches de mesure montées de façon mobile sur la deuxième mâchoire de manière à pouvoir être écartées l'une de l'autre et être rapprochées l'une de l'autre pour être appliquées, en position d'usinage, dans des positions diamétralement opposées contre la portée à usiner. La deuxième mâchoire comporte, en outre, avantageusement des moyens pour écarter les deux touches dc mesure l'une de l'autre lorsque les mâchoires ne sont pas serrées et pour les rapprocher l'une de l'autre lorsque les mâchoires sont serrées.The machining assembly according to the invention may include, in addition, integrated means for checking the diameter of the bearing surface machining courses. The second jaw carries in this case, in addition to two feedback keys, two measuring keys mounted so movable on the second jaw so that it can be moved apart from each other and be brought together to be applied, in the machining position, in diametrically positions opposite against the surface to be machined. The second jaw has, in addition, advantageously means for removing the two keys dc measures from each other when the jaws are not tight and to bring them closer to each other when the jaws are tight.
Dans le cadre de l'invention, lesdits moyens pour écarter et rapprocher les deux touches de mesure l'une de l'autre peuvent être directement actionnés par le mouvement d'ouverture et de fermeture des mâchoires, ou alors être commandés en fonction de ce mouvement pour leur écartement et rapprochement.In the context of the invention, said means for removing and bringing the two measurement keys closer to each other can be directly actuated by the opening and closing movement jaws, or be ordered according to this movement for their spacing and approximation.
En se référant au dessin schématique annexé, on va décrire
ci-après plus en détail deux modes de réalisation illustratifs et non
limitatifs d'un ensemble d'usinage par bande abrasive conforme à
l'invention; sur le dessin :
Tel qu'illustré sur la figure 1, l'usinage par bande abrasive
d'une portée cylindrique 1 d'une pièce s'effectue par un ensemble
d'usinage qui peut faire partie d'une machine d'usinage comprenant
plusieurs ensembles pour l'usinage simultanément de plusieurs portées
d'une même pièce, par exemple de plusieurs tourillons et/ou manetons
d'un vilebrequin. Pour plus de détails concernant la structure générale
et la fonction d'une telle machine, il est possible de se référer par
exemple au document FR-A-2 636 877 (= US-A-5 058 325).As illustrated in Figure 1, machining with an abrasive belt
a
L'ensemble comprend essentiellement une première mâchoire
3 qui est montée pivotante autour d'un axe 2, et une deuxième
mâchoire 5 montée pivotante autour d'un axe horizontal 6 sur la
première mâchoire 3, l'équilibrage de l'ensemble étant assuré par un
vérin d'équilibrage 4. Un vérin 7 assure le serrage et desserrage des
deux mâchoires 3 et 5 et un système de blocage comprenant une rampe
8 qui coopére avec la mâchoire 5 sous l'action d'un vérin 9 est prévu
pour bloquer les deux mâchoires 3, 5 de la façon irréversible en
position serrée. Cela permet notamment d'améliorer la géométrie de la
portée, les mâchoires ne pouvant pas s'écarter pour "franchir" des
défauts de forme de la portée pendant l'usinage.The set essentially includes a
La première mâchoire 3 porte un sabot 10 présentant, sur le
côté tourné vers la portée 1 à usiner, une surface d'appui 11 concave,
rigide, en secteur de cylindre, de forme adaptée à celle de la portée 1 à
usiner, la longueur axiale de la surface d'appui 11 étant inférieure à la
longueur axiale de la portée 1 à usiner. A titre d'exemple, le sabot 10
peut être en acier, la surface d'appui 11 étant rectifiée avec précision.
Dans l'exemple représenté, la surface d'appui 11 en secteur de cylindre
s'étend sur un angle circonférentiel d'environ 130°.The
De part et d'autre du sabot 10, la mâchoire 3 porte un
dispositif 12 de serrage d'une bande abrasive 13 qui, déroulée d'une
réserve 14 passe par le premier dispositif de serrage 12, sur la surface
d'appui 11 du sabot 10, par le deuxième dispositif de serrage 12 et de
là sur un dispositif de renvidage 15.On either side of the
La deuxième mâchoire 5 porte un support de réaction 16
présentant une forme correspondant sensiblement à celle du sabot 10
de la première mâchoire 3, mais comportant deux galets de réaction
17, montés en rotation sur le support 16, leurs axes étant parallèles à
l'axe de la portée 1 à usiner, de telle manière que les deux galets 17
dépassent quelque peu la surface concave en secteur de cylindre que le
support 16 présente sur le côté tourné vers la portée 1. Dans l'exemple
représenté, les deux galets 17 présentent un diamètre inférieur au
diamètre de la portée 1 et sont montés sur le support 16 de manière
que lors du serrage des deux mâchoires 3 et 5 contre la portée 1, les
deux galets 17 soient appliqués directement contre la portée 1 suivant
deux génératrices de cette dernière espacées l'une de l'autre d'un angle
circonférentiel de l'ordre de 90°.The
La mâchoire 5 porte, en outre, deux touches de mesure 18 qui
sont fixées, de part et d'autre du support de réaction 16, sur des axes
19 parallèles à l'axe de la portée pour pouvoir être écartées l'une de
l'autre et être rapprochées l'une de l'autre pour être appliquées dans
des positions diamétralement opposées contre la portée 1 à usiner. Des
moyens non représentés sont prévus pour écarter les deux touches 18
l'une de l'autre, par pivotement des axes 19, lorsque les mâchoires 3, 5
ne sont pas serrées et pour les rapprocher l'une de l'autre lorsque les
mâchoires sont serrées, ces moyens pouvant soit être directement
actionnés par le mouvement d'ouverture et de fermeture des mâchoires,
soit être commandés en fonction de ce mouvement.The
L'ensemble d'usinage tel qu'illustré par les figures 2 et 3 présente une structure générale qui correspond à celle des ensembles d'usinage de la machine suivant le document FR-A-2 636 877 (= US-A-5 058 325).The machining assembly as illustrated in Figures 2 and 3 presents a general structure which corresponds to that of the sets for machining the machine according to document FR-A-2 636 877 (= US-A-5 058 325).
Deux mâchoires 103 et 105 sont montées pivantes autour
d'axes 101 et 102 sur un support commun 100, l'équilibrage de
l'ensemble étant assuré par un vérin 104. L'agencement est choisi de
manière que les mâchoires 103 et 105 puissent être écartées l'une de
l'autre et être rapprochées l'une de l'autre en vue du serrage contre la
portée 1 à usiner, par des mouvements "horizontaux" plutôt que par
des mouvements "verticaux" comme c'est le cas pour les mâchoires du
mode de réalisation de la figure 1. Ces mouvements sont commandés
par un vérin 107 agissant sur la mâchoire 103, les deux mâchoires 103
et 105 étant couplées par des pignons 106. Un système de blocage
comprenant une rampe 108 qui coopère avec la mâchoire 105 sous
l'action d'un vérin 109, est prévu pour bloquer les deux mâchoires 103
et 105 de façon irréversible en position serrée.Two
La première mâchoire 103 porte un sabot 110 présentant, sur
le côté tourné vers la portée 1 à usiner, une surface d'appui 111 rigide,
concave, en secteur de cylindre, de forme adaptée à celle de la portée
1 à usiner.The
De part et d'autre du sabot 110, la mâchoire 103 porte un
dispositif 12 de serrage d'une bande abrasive 113 qui, déroulée d'une
réserve non représentée, passe par le premier dispositif de serrage 112,
sur la surface d'appui 111 du sabot 110, par le deuxième dispositif de
serrage 112 et est ensuite réembobinée sur un dispositif de renvidage
non représenté.On both sides of the
La deuxième mâchoire 105 est constituée de deux mâchoires
partielles 105a et 105b juxtaposées (voir surtout la figure 3). La
mâchoire partielle 105a est couplée (pignons 106) avec la mâchoire
103, tandis que la mâchoire partielle 105b est entraínée par la
mâchoire 105a en passant par un ressort 114.The
La mâchoire partielle 105a porte un support de réaction 116
comportant deux galets de réaction 117 montés en rotation sur le
support 116, leurs axes étant parallèles à l'axe de la portée 1 à usiner.
Les deux galets 117 sont espacés l'un de l'autre de manière à être
appliqués contre la portée 1 à usiner suivant deux génératrices de cette
dernière espacées l'une de l'autre d'un angle circonférentiel inférieur à
90°, en l'occurence un angle de l'ordre de 75°.The
La mâchoire partielle 105b porte deux touches de mesure 118
montées de manière à pouvoir pivoter autour d'axes 119 parallèles à
l'axe de la portée 1, pour pouvoir être écartées l'une de l'autre et être
rapprochées l'une de l'autre en vue de leur application, dans des
positions diamétralement opposées, contre la portée 1 à usiner. Les
mouvements d'écartement et de rapprochement des touches de réaction
118 sont produits par des moyens d'actionnement 120 commandés en
fonction du mouvement de serrage et de desserrage des mâchoires 103,
105.The
Par ailleurs, le support 100 porte une butée 121 contre
laquelle la mâchoire partielle 105b, entraínée par la mâchoire partielle
105a, vient porter lors du serrage des deux mâchoires 103, 105, la
butée 121 définissant ainsi la position dans laquelle les deux touches
de mesure 110 viennent s'appliquer contre la portée 1 à usiner.Furthermore, the
Cela assure l'indépendance des touches de mesure 118
portées par la mâchoire partielle 105b, par rapport au support de
réaction 116 porté par la mâchoire partielle 105a, et permet d'ajuster
avec précision la position des touches de mesure 118 de manière que
ces dernières soient situées exactement sur le diamètre de la portée 1 à
usiner, lorsqu'elles sont en contact avec cette dernière.This ensures the independence of the measurement keys 118
carried by the
Il va de soi que les modes de réalisation représentés et
décrits n'ont été donnés qu'à titre d'exemples illustratifs et que de
nombreuses modifications et variantes sont possibles dans le cadre de
l'invention. Cela concerne non seulement la structure générale de
l'ensemble d'usinage, mais également par exemple l'angle sur lequel la
bande abrasive 13, 113 est appliquée contre la portée 1 par le sabot 10,
110 de la première mâchoire 3, 103, lequel angle est avantageusement
compris entre environ 120° et moins de 180°, ainsi que l'angle
séparant les deux génératrices de contact des galets de réaction 17,
117 avec la portée 1, cet angle pouvant être de préférence compris
entre environ 60° et 120°.It goes without saying that the embodiments shown and
described have only been given as illustrative examples and only
many modifications and variants are possible within the framework of
the invention. This concerns not only the general structure of
the machining assembly, but also for example the angle at which the
Par ailleurs, les galets 17, 117 pourraient être remplacés par
des portées ou touches non rotatives, sous la forme de patins, bien que
des galets permettent de réduire le frottement avec la portée 1 pendant
la rotation.Furthermore, the
Il convient encore de remarquer que les galets de réaction 17,
117 (ou les touches de réaction non rotatives) peuvent être mobiles en
translation axiale par rapport à la mâchoire 5, 105, cela afin de suivre
le mouvement oscillatoire en translation axiale que la portée 1 subit au
cours de son usinage par la bande abrasive 13, 113, en plus de sa
rotation, comme cela est bien connu pour l'usinage par abrasif,
notamment la superfinition. Une autre possibilité serait de rendre la
mâchoire 5, 105 mobile axialement par rapport à la mâchoire 3, 103, et
de faire en sorte qu'elle "rentre" dans le vilebrequin, entre les deux
parties délimitant la portée 1 à usiner, de sorte que les galets 17, 117
se trouvent directement entraínés par la pièce à usiner dans son
mouvement oscillatoire de translation axiale.It should also be noted that the
Enfin, la bande abrasive 13, comme représenté sur la figure
1, au lieu d'être déroulée d'une réserve 14 et d'être immobilisée par les
dispositifs de serrage 12 sur la surface d'appui 11 du sabot 10, pourrait
également être par exemple une bande abrasive ayant une face
adhésive pour être immobilisée par collage sur la surface d'appui 11.Finally, the
Claims (8)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9701014 | 1997-01-30 | ||
FR9701014A FR2758756B1 (en) | 1997-01-30 | 1997-01-30 | MACHINE ASSEMBLY BY ABRASIVE BELT OF A CYLINDRICAL RANGE OF A WORKPIECE |
US09/016,688 US5984767A (en) | 1997-01-30 | 1998-01-30 | Assembly using an abrasive strip to machine a cylindrical bearing surface of a workpiece |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0856379A1 true EP0856379A1 (en) | 1998-08-05 |
EP0856379B1 EP0856379B1 (en) | 2002-08-14 |
Family
ID=26233289
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98400201A Expired - Lifetime EP0856379B1 (en) | 1997-01-30 | 1998-01-30 | Grinding belt assembly for machining a cylindrical bearing surface on a workpiece |
Country Status (5)
Country | Link |
---|---|
US (1) | US5984767A (en) |
EP (1) | EP0856379B1 (en) |
DE (1) | DE69807127T2 (en) |
ES (1) | ES2183295T3 (en) |
FR (1) | FR2758756B1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102672612A (en) * | 2012-06-06 | 2012-09-19 | 贵阳险峰机床有限责任公司 | Workpiece device for on-line measuring of numerical control roll grinder |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6309287B2 (en) * | 1998-01-15 | 2001-10-30 | Ford Global Technologies | Cam micro-finishing tool |
EP1053826A3 (en) * | 1999-05-15 | 2003-02-05 | Supfina Grieshaber GmbH & Co. KG | Apparatus for belt finishing of curved workpiece surfaces |
DE10009980C1 (en) * | 2000-03-03 | 2001-08-23 | Thielenhaus Ernst Gmbh & Co Kg | Device for finishing shafts, in particular crankshafts and camshafts |
FR2808463B1 (en) | 2000-05-04 | 2002-09-13 | Procedes Et Machines Speciales | ABRASIVE TAPE MACHINE FOR CYLINDRICAL DOORS ON PARTS |
DE102007051047B4 (en) * | 2007-10-16 | 2023-03-23 | Nagel Maschinen- Und Werkzeugfabrik Gmbh | Press-on device for finishing belt and device and method for finishing peripheral surfaces on cylindrical workpiece sections |
JP2009119548A (en) * | 2007-11-14 | 2009-06-04 | Honda Motor Co Ltd | Shaft part finishing device |
US8753172B1 (en) * | 2009-10-29 | 2014-06-17 | Fricso Ltd. | Superfinishing systems and methods |
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EP0382336A2 (en) * | 1989-02-07 | 1990-08-16 | Industrial Metal Products Corporation | Size control shoe for microfinishing machine |
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WO1996020068A1 (en) * | 1994-12-27 | 1996-07-04 | Marposs Societa' Per Azioni | Checking device for a microfinishing machine tool |
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US799442A (en) * | 1904-09-28 | 1905-09-12 | Henry L Bornman | Sanding-machine. |
US1502130A (en) * | 1922-12-07 | 1924-07-22 | Clair John A St | Sanding machine |
JPS538603A (en) * | 1976-07-13 | 1978-01-26 | Kao Corp | Equipment for polishing side surface of molded soap |
US4145846A (en) * | 1977-06-22 | 1979-03-27 | The Cessna Aircraft Company | Contour belt grinding device |
US4682444A (en) * | 1984-05-07 | 1987-07-28 | Industrial Metal Products Corporation | Microfinishing apparatus and method |
DE8602817U1 (en) * | 1986-02-04 | 1986-04-10 | Maschinenbau Grieshaber GmbH & Co, 77709 Wolfach | Device for machining bearing journals of crankshafts or the like. |
FR2636877B1 (en) * | 1988-09-27 | 1994-07-01 | Procedes Machines Speciales | MACHINE FOR THE ABRASIVE MACHINING OF CYLINDRICAL SURFACES ON PARTS, PARTICULARLY FOR THE MACHINING BY CANVAS OF TRACKS AND CRANKSHAFT ON CRANKSHAFT |
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DE4426923A1 (en) * | 1994-07-29 | 1996-02-01 | Grieshaber Masch | Device for the surface treatment of workpieces |
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US5775974A (en) * | 1996-12-10 | 1998-07-07 | K-Line Industries, Inc. | Universal jaw attachment for microfinishing machine |
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1997
- 1997-01-30 FR FR9701014A patent/FR2758756B1/en not_active Expired - Fee Related
-
1998
- 1998-01-30 US US09/016,688 patent/US5984767A/en not_active Expired - Fee Related
- 1998-01-30 DE DE69807127T patent/DE69807127T2/en not_active Expired - Fee Related
- 1998-01-30 ES ES98400201T patent/ES2183295T3/en not_active Expired - Lifetime
- 1998-01-30 EP EP98400201A patent/EP0856379B1/en not_active Expired - Lifetime
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US1905821A (en) * | 1929-03-15 | 1933-04-25 | Norton Co | Lapping device for cylindrical objects |
US1908048A (en) * | 1930-09-02 | 1933-05-09 | Norton Co | Lapping machine |
EP0382336A2 (en) * | 1989-02-07 | 1990-08-16 | Industrial Metal Products Corporation | Size control shoe for microfinishing machine |
US5531631A (en) * | 1994-04-28 | 1996-07-02 | Industrial Metal Products Corporation | Microfinishing tool with axially variable machining effect |
WO1996020068A1 (en) * | 1994-12-27 | 1996-07-04 | Marposs Societa' Per Azioni | Checking device for a microfinishing machine tool |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102672612A (en) * | 2012-06-06 | 2012-09-19 | 贵阳险峰机床有限责任公司 | Workpiece device for on-line measuring of numerical control roll grinder |
CN102672612B (en) * | 2012-06-06 | 2014-07-02 | 贵阳险峰机床有限责任公司 | Workpiece device for on-line measuring of numerical control roll grinder |
Also Published As
Publication number | Publication date |
---|---|
FR2758756B1 (en) | 1999-02-26 |
DE69807127T2 (en) | 2004-03-25 |
ES2183295T3 (en) | 2003-03-16 |
DE69807127D1 (en) | 2002-09-19 |
US5984767A (en) | 1999-11-16 |
FR2758756A1 (en) | 1998-07-31 |
EP0856379B1 (en) | 2002-08-14 |
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