WO2005118219A1 - Gripper for holding a piece to be machined in a grinding machine - Google Patents

Gripper for holding a piece to be machined in a grinding machine Download PDF

Info

Publication number
WO2005118219A1
WO2005118219A1 PCT/CH2005/000290 CH2005000290W WO2005118219A1 WO 2005118219 A1 WO2005118219 A1 WO 2005118219A1 CH 2005000290 W CH2005000290 W CH 2005000290W WO 2005118219 A1 WO2005118219 A1 WO 2005118219A1
Authority
WO
WIPO (PCT)
Prior art keywords
branches
arms
clamp
pivoting device
central zone
Prior art date
Application number
PCT/CH2005/000290
Other languages
French (fr)
Inventor
Emmanuel Frei
Michel Rollier
Original Assignee
Rollomatic Sa
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rollomatic Sa filed Critical Rollomatic Sa
Priority to EP05740399A priority Critical patent/EP1750901A1/en
Priority to JP2007513646A priority patent/JP2008500908A/en
Publication of WO2005118219A1 publication Critical patent/WO2005118219A1/en

Links

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
    • B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
    • B24B3/24—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of drills
    • B24B3/247—Supports for drills
    • 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
    • B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
    • B24B3/24—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of drills
    • 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
    • B24B41/06—Work supports, e.g. adjustable steadies
    • 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
    • B24B41/06—Work supports, e.g. adjustable steadies
    • B24B41/066—Work supports, e.g. adjustable steadies adapted for supporting work in the form of tools, e.g. drills
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/0011—Working of insulating substrates or insulating layers
    • H05K3/0044—Mechanical working of the substrate, e.g. drilling or punching
    • H05K3/0047—Drilling of holes

Definitions

  • Pliers for holding a workpiece in a grinding machine are provided.
  • the present invention relates to a clamp for holding a workpiece in a grinding machine.
  • the grinding machine is equipped with a holding clamp ensuring secure support of the workpiece, in particular of the cylindrical end portion of the drill during at least part of the operations.
  • Retaining clamps comprising, in one piece, a central zone of attachment to a support and two parallel branches connected to the central zone by several narrow arms which are elastically deformable. At one of their ends, the branches are provided with spouts adapted to the type of parts to be supported while a pressure mechanism acts on their other end to cause the clamping of the spouts.
  • the clamp In the state of rest, the clamp is in the open position and its closing, for engagement of the part, requires the action of a guided pusher acting between the ends of the arms of the clamp opposite to those carrying the spouts.
  • the spouts When the spouts are closed, the part, the pliers arms and the pusher constitute a hyperstatic system. It follows that, if the closing movement is not strictly isometric (for example if the pusher does not press equally on the two branches of the clamp, in particular due to wear or play), this movement causes a displacement of the part which constitutes the weak element of the system.
  • the subject of the present invention is an improved holding clamp, with which the workpiece is gripped by elastic deformation but passively, in the absence of force outside.
  • the mounting of the spouts is such that the clamp exerts in the closed position a determined force on the part, without external action.
  • the present invention relates to a gripper for holding a workpiece on a grinding machine, in particular for drilling drills with end portion having a large length to diameter ratio, comprising a gripper body in one piece with two parallel branches having a rear end and a front end, with a central zone for fixing the clamp on a support, and elastically flexible arms cut out from the body so as to ensure the connection between the central zone and the branches by forming a pivoting device , so that a control member acting on the rear ends of the branches causes the front ends to be moved apart or brought together by pivoting the branches in the pivoting device, characterized in that the pivoting device is arranged so that the control member being in a rest position, the front ends of the branches are brought together es and the clamp is in the closed position, while in moving towards an active position, this control member deforms the pivoting device and the front ends of the branches are spaced apart.
  • the front ends of the branches are equipped with clamping spouts adapted to the dimensions of the part to be maintained, fixed by fixing means, so as to prevent any displacement during grinding.
  • the opening of the clamp can be obtained by displacement of a control member in translation along the rear ends of the branches, two diverging ramps on the branches of the clamp transforming the longitudinal movement into a transverse movement causing the branches to pivot.
  • at least one of the tips of the spouts has a groove having a vee shape so as to constitute two points of contact with the workpiece, which makes it possible to maintain the workpiece to be ground. '' in a statically determined manner, without risk of modification of the conditions of taking.
  • the pivoting device is preferably produced by a cut in the blank of the body of the clamp by forming four elastic arms connecting two by two the central area to each of the branches which determines two parallel, fictitious axes of rotation, ensuring operation high precision.
  • the construction according to the invention makes it possible to produce pliers capable of holding end cylindrical parts of drills of very small diameters, in particular diameters of the order of 0.05 mm.
  • Such drills are used for example on printed circuit boards to execute holes with an accuracy of the order of a micron.
  • - fig. 1 is a top plan view showing the one-piece body of the clamp
  • - figs. 2, 3 and 4 are views of a clamping spout, respectively in plan, in side elevation and in end elevation;
  • - fig. 5 is a plan view on an enlarged scale showing the part of the tip of the spout of FIG. 2 located inside the circle c;
  • FIG. 6 is a top plan view showing the pliers complete with its control member.
  • the clamp body 1 shown in FIG. 1 is a steel part having the desired metallurgical properties so that its various parts, obtained after cutting, fulfill the required functions. These different parts include a central zone 2, two parallel branches of symmetrical shapes 3 and 4, and a pivoting device 5 forming two fictitious pivot axes a and b (corresponding to the respective intersections of the axes of the arms 12 and 15 and of the arms 13 and 14 described below), which we see that they are located on the same line perpendicular to the general longitudinal axis of the clamp, on either side of this axis.
  • the central zone 2 is rectangular in shape with a central hole 6 tapped for fixing the body 1 on a fixed support, and with four holes 7 adjusted and intended to receive positioning pins on the support. It is delimited with respect to the branches 3 and 4 by a narrow cutout 8 which surrounds it on its four sides except in the center of the side facing the front end of the branches.
  • This interruption of the cutout 8 located between two slightly enlarged end portions 8a and 8b forms the base of the pivoting device 5.
  • the device for pivot 5 consists of four short and narrow arms 12, 13, 14 and 15 arranged in a fan shape and connecting the arms 3 and 4 by their front part to the central zone 2 of the body 1.
  • tools can be used with controlled command, like EDM for example.
  • the cutting is carried out so that the two arms 12 and 13 are oriented substantially parallel to the longitudinal axis of the clamp, with the two arms 14 and 15 oriented substantially perpendicular to said longitudinal axis.
  • a slightly trapezoidal space 16 separates the rear ends of the branches 3 and 4 which each still have a ramp 27 and 28 intended to cooperate with a control member 26 (fig. 6) of the openings and closings of the clamp, as will be seen more far. Stops 32, 33 for limiting the opening stroke of the clamp are also provided near the rear ends of the branches 3 and 4.
  • FIGS. 2 to 5 One of the clamping spouts 17 is shown in FIGS. 2 to 5.
  • plan fig. 2
  • it has an elongated generally rectangular shape with, in its front part, a bevelled face and an oblique lateral side.
  • Two holes 18 and 19 connected by transverse cutouts respectively to the external face and to the internal face of the spout are provided for the engagement of pins which will be accommodated without play with elastic clamping in corresponding holes of the clamp branch intended for receive the beak.
  • the front point of the beak 17 also has a rectangular rim 20 projecting inwards (FIGS. 3 and 4), in which a groove 22 is formed, preferably made of vee. All these elements are produced with extreme precision, the spouts 17 being formed in a highly alloyed steel, for example with quenched and tempered MnCr.
  • FIG. 5 the rim 20 of FIG. 2 on a considerably enlarged scale.
  • the two sides 23 and 24 of the groove 22 are planar and, in this example, perpendicular to one another.
  • the end of an oblique edge between the bevelled face and the upper flat face of the spout 17 terminates in the center of the flank 23.
  • the cylindrical surface of a drill 25 is engaged in the groove 22 so as to press along four generatrices against the sides 23 and 24 of the tips of the two nozzles 17.
  • only one of the tips 20 of the clamping spouts 17 has a groove 22 with a vee profile, the tip 20 of the other spout may not have a groove.
  • one or both grooves with a vee profile can be replaced by grooves in the shape of a half-moon or any other suitable shape.
  • the pliers are shown as a whole, with a drill 25, in FIG. 6.
  • the two branches 3 and 4 on either side of the central zone 2, are in their closed position, the control member 26 being offset relative to the rear end of the branches and ramps 27 , 28.
  • This member 26 is a ring sliding on the outer sides of the branches 3 and 4 and moving under the effect of a mechanism which it is not necessary to describe.
  • the space 16 is slightly trapezoidal.
  • the longitudinal spaces separating the central zone 2 from the arms 3 and 4 are of slightly trapezoidal shapes. This arrangement allows said spaces to absorb the movement of arms 3 and 4 closer to the opening of the clamp.
  • the two nozzles 17 of the clamp are fixed on the front parts of the branches 3 and 4 in positions which are exactly determined by pins 29 engaged in the openings 18 and 19 and the corresponding holes of the branches 3 and 4.
  • plates 30 fixed by screws 31 ensure the fixing. It is understood that the positioning of the spouts on the clamp by means of the pins 29 and the screws 31 is carried out as a function of the diameter of the terminal part of the drill, so that in the closed position, with the control member 26 in the offset position , the pivoting device 5 is in a state of elastic bending ensuring the clamping of the terminal part of the drill, so that the grinding can be carried out safely.
  • the member 26 is moved to the ramps 27, 28, which has the effect of opening the clamp and therefore allowing the drill to be released.
  • the assembly is arranged so that the opening of the clamp is caused by a downward movement of one control member 26.
  • the assembly can of course also be arranged so that the opening of the clamp is caused by an upward movement of the control member 26.
  • each set of spouts adapted to the different grinding drills can be mounted case by case on the same pliers. However, it may also be preferable to provide that each set of spouts is permanently mounted on different pliers.
  • the maintenance of the part is statically determined, without external action, without modification of the gripping conditions.
  • the wear of the actuating parts or any other disturbance has no influence on the grip and maintenance of the parts to be ground. Accuracy well below a micron (10 ⁇ 6 meter) can be achieved in practice.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jigs For Machine Tools (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)

Abstract

The body (1) is cut into a piece with the central area (2) that will be rigidly fixed to a support, the two parallel branches (3, 4) and with the pivoting device (5) with the four elastic arms (12, 13, 14, 15) joining the branches to the central area (2). The jaws (17) are fixed to the branches (3, 4) by the pins (29), the plates (30) and by the screws (31). When the operating element (26) is in a position of rest, the end part of a drill bit (25) is gripped between the points of the jaws (17). The gripper is opened by the displacement of the operating element (26) that, while rising on the ramps (27, 28), moves closer to the rear ends of the branches and deforms the pivoting device whereby separating the jaws (17) from one another.

Description

Pince de maintien d'une pièce à usiner dans une machine de meulage . Pliers for holding a workpiece in a grinding machine.
La présente invention concerne une pince de maintien d'une pièce à usiner dans une machine de meulage.The present invention relates to a clamp for holding a workpiece in a grinding machine.
Pour certaines pièces nécessitant des usinages par meulage, comme par exemple des outils de perçage en métal dur ou en acier rapide devant satisfaire à des exigences très poussées, notamment lorsqu'il s'agit de forets ayant un grand rapport longueur sur diamètre, il faut que la machine à meuler soit équipée d'une pince de maintien assurant un appui sûr de la pièce, notamment de la partie cylindrique terminale du foret pendant au moins une partie des opérations.For certain parts requiring machining by grinding, such as, for example, drilling tools made of hard metal or high-speed steel which have to meet very demanding requirements, in particular when it comes to drills with a large length to diameter ratio, that the grinding machine is equipped with a holding clamp ensuring secure support of the workpiece, in particular of the cylindrical end portion of the drill during at least part of the operations.
On connaît actuellement des pinces de maintien comportant, en une pièce, une zone centrale de fixation sur un support et deux branches parallèles reliées à la zone centrale par plusieurs bras étroits et déformables élastiquement . A l'une de leurs extrémités, les branches sont pourvues de becs adaptés au type de pièces à soutenir tandis qu'un mécanisme de pression agit sur leur autre extrémité pour provoquer le serrage des becs. A l'état de repos, la pince est en position ouverte et sa fermeture, pour mise en prise de la pièce, nécessite l'action d'un poussoir guidé agissant entre les extrémités des bras de la pince opposées à celles portant les becs. Lors de la fermeture des becs, la pièce, les bras de la pince et le poussoir constituent un système hyperstatique. Il en résulte que, si le mouvement de fermeture n'est pas rigoureusement isométrique (par exemple si le poussoir n'appuie pas de façon égale sur les deux branches de la pince, notamment pour cause d'usure ou de jeu) , ce mouvement provoque un déplacement de la pièce qui constitue l'élément faible du système .Retaining clamps are currently known comprising, in one piece, a central zone of attachment to a support and two parallel branches connected to the central zone by several narrow arms which are elastically deformable. At one of their ends, the branches are provided with spouts adapted to the type of parts to be supported while a pressure mechanism acts on their other end to cause the clamping of the spouts. In the state of rest, the clamp is in the open position and its closing, for engagement of the part, requires the action of a guided pusher acting between the ends of the arms of the clamp opposite to those carrying the spouts. When the spouts are closed, the part, the pliers arms and the pusher constitute a hyperstatic system. It follows that, if the closing movement is not strictly isometric (for example if the pusher does not press equally on the two branches of the clamp, in particular due to wear or play), this movement causes a displacement of the part which constitutes the weak element of the system.
La présente invention a pour objet une pince de maintien améliorée, avec laquelle la prise de pièce est réalisée par déformation élastique mais passivement, en l'absence de force extérieure . Le montage des becs est tel que la pince exerce en position fermée une force déterminée sur la pièce, sans action extérieure .The subject of the present invention is an improved holding clamp, with which the workpiece is gripped by elastic deformation but passively, in the absence of force outside. The mounting of the spouts is such that the clamp exerts in the closed position a determined force on the part, without external action.
A cet effet, la présente invention concerne une pince de maintien pour pièce à usiner sur une machine de meulage, notamment pour forets de perçage à partie terminale présentant un grand rapport longueur sur diamètre, comportant un corps de pince en une pièce avec deux branches parallèles ayant une extrémité arrière et une extrémité avant, avec une zone centrale de fixation de la pince sur un support, et des bras élastiquement flexibles découpés dans le corps de manière à assurer la liaison entre la zone centrale et les branches en formant un dispositif de pivotement, de sorte qu'un organe de commande agissant sur les extrémités arrières des branches provoque des écartements ou des rapprochements des extrémités avant par pivotement des branches dans le dispositif de pivotement, caractérisée en ce que le dispositif de pivotement est agencé de manière que l'organe de commande étant dans une position de repos, les extrémités avant des branches sont rapprochées et la pince est en position de fermeture, tandis qu'en se déplaçant vers une position active, cet organe de commande déforme le dispositif de pivotement et les extrémités avant des branches sont écartées .To this end, the present invention relates to a gripper for holding a workpiece on a grinding machine, in particular for drilling drills with end portion having a large length to diameter ratio, comprising a gripper body in one piece with two parallel branches having a rear end and a front end, with a central zone for fixing the clamp on a support, and elastically flexible arms cut out from the body so as to ensure the connection between the central zone and the branches by forming a pivoting device , so that a control member acting on the rear ends of the branches causes the front ends to be moved apart or brought together by pivoting the branches in the pivoting device, characterized in that the pivoting device is arranged so that the control member being in a rest position, the front ends of the branches are brought together es and the clamp is in the closed position, while in moving towards an active position, this control member deforms the pivoting device and the front ends of the branches are spaced apart.
De préférence, les extrémités avant des branches sont équipées de becs de serrage adaptés aux dimensions de la pièce à maintenir, fixés par des moyens de fixation, de manière à empêcher tout déplacement lors du meulage .Preferably, the front ends of the branches are equipped with clamping spouts adapted to the dimensions of the part to be maintained, fixed by fixing means, so as to prevent any displacement during grinding.
L'ouverture de la pince peut être obtenue par déplacement d'un organe de commande en translation le long des extrémités arrières des branches, deux rampes divergentes sur les branches de la pince transformant le mouvement longitudinal en un mouvement transversal provoquant le pivotement des branches . Dans une forme de réalisation préférentielle, l'une au moins des pointes des becs présente une gorge ayant une forme en vé de façon à constituer deux points de contact avec la pièce, ce qui permet d'assurer le maintien de la pièce à meuler d'une manière statiquement déterminée, sans risque de modification des conditions de prise.The opening of the clamp can be obtained by displacement of a control member in translation along the rear ends of the branches, two diverging ramps on the branches of the clamp transforming the longitudinal movement into a transverse movement causing the branches to pivot. In a preferred embodiment, at least one of the tips of the spouts has a groove having a vee shape so as to constitute two points of contact with the workpiece, which makes it possible to maintain the workpiece to be ground. '' in a statically determined manner, without risk of modification of the conditions of taking.
Le dispositif de pivotement est de préférence réalisé par une découpe dans l'ébauche du corps de la pince en formant quatre bras élastiques reliant deux à deux la zone centrale à chacune des branches ce qui détermine deux axes de rotation parallèles, fictifs, assurant un fonctionnement de haute précision.The pivoting device is preferably produced by a cut in the blank of the body of the clamp by forming four elastic arms connecting two by two the central area to each of the branches which determines two parallel, fictitious axes of rotation, ensuring operation high precision.
La construction selon l'invention permet de produire des pinces capables de maintenir des parties cylindriques terminales de forets de très faibles diamètres, en particulier des diamètres de l'ordre de 0,05 mm. De tels forets sont utilisés par exemple sur des plaques de circuits imprimés pour exécuter des trous avec une précision de l'ordre du micron.The construction according to the invention makes it possible to produce pliers capable of holding end cylindrical parts of drills of very small diameters, in particular diameters of the order of 0.05 mm. Such drills are used for example on printed circuit boards to execute holes with an accuracy of the order of a micron.
On décrit maintenant, à simple titre d'exemple, une forme d'exécution de l'objet de l'invention en se référant aux dessins annexés, dontAn embodiment of the object of the invention will now be described, by way of example only, with reference to the accompanying drawings, of which
- la fig. 1 est une vue en plan de dessus montrant le corps monobloc de la pince;- fig. 1 is a top plan view showing the one-piece body of the clamp;
- les fig. 2, 3 et 4 sont des vues d'un bec de serrage, respectivement en plan, en élévation latérale et en élévation en bout;- figs. 2, 3 and 4 are views of a clamping spout, respectively in plan, in side elevation and in end elevation;
- la fig. 5 est une vue en plan à échelle agrandie montrant la partie de la pointe du bec de la fig. 2 située à l'intérieur du cercle c; et- fig. 5 is a plan view on an enlarged scale showing the part of the tip of the spout of FIG. 2 located inside the circle c; and
- la fig. 6 est une vue en plan de dessus montrant la pince complète avec son organe de commande. Le corps de pince 1 représenté à la fig. 1 est une pièce en acier présentant les propriétés métallurgiques voulues pour que ses différentes parties, obtenues après découpe, remplissent les fonctions requises. Ces différentes parties comprennent une zone centrale 2, deux branches parallèles et de formes symétriques 3 et 4, et un dispositif de pivotement 5 formant deux axes de pivotement fictifs a et b (correspondant aux intersections respectives des axes des bras 12 et 15 et des bras 13 et 14 décrits plus loin), dont on voit qu'ils sont situés sur une même ligne perpendiculaire à l'axe général longitudinal de la pince, de part et d'autre de cet axe.- fig. 6 is a top plan view showing the pliers complete with its control member. The clamp body 1 shown in FIG. 1 is a steel part having the desired metallurgical properties so that its various parts, obtained after cutting, fulfill the required functions. These different parts include a central zone 2, two parallel branches of symmetrical shapes 3 and 4, and a pivoting device 5 forming two fictitious pivot axes a and b (corresponding to the respective intersections of the axes of the arms 12 and 15 and of the arms 13 and 14 described below), which we see that they are located on the same line perpendicular to the general longitudinal axis of the clamp, on either side of this axis.
La zone centrale 2 est de forme rectangulaire avec un trou central 6 taraudé pour la fixation du corps 1 sur un support fixe, et avec quatre trous 7 ajustés et destinés à recevoir des goupilles de positionnement sur le support. Elle est délimitée par rapport aux branches 3 et 4 par une découpe étroite 8 qui l'entoure sur ses quatre côtés sauf au centre du côté tourné vers 1 ' extrémité avant des branches .The central zone 2 is rectangular in shape with a central hole 6 tapped for fixing the body 1 on a fixed support, and with four holes 7 adjusted and intended to receive positioning pins on the support. It is delimited with respect to the branches 3 and 4 by a narrow cutout 8 which surrounds it on its four sides except in the center of the side facing the front end of the branches.
Cette interruption de la découpe 8 située entre deux portions terminales légèrement élargies 8a et 8b forme la base du dispositif de pivotement 5. Celui-ci est délimité d'autre part par deux découpes profilées et symétriques 9 et 10 ayant la forme de triangles curvilignes ou de profils de fleurs et par une extrémité élargie lia d'une fente 11 qui s'étend selon l'axe longitudinal du corps 1 et sépare l'une de l'autre les extrémités avant des branches 3 et 4. Ainsi, le dispositif de pivotement 5 est constitué de quatre bras courts et étroits 12, 13, 14 et 15 disposés en éventail et reliant les branches 3 et 4 par leur partie avant à la zone centrale 2 du corps 1. Pour réaliser les découpes, on peut utiliser des outillages à commande contrôlée, comme l' électroérosion par exemple. Dans l'exemple représenté, la découpe est réalisée de façon que les deux bras 12 et 13 sont orientés sensiblement parallèlement à l'axe longitudinal de la pince, avec les deux bras 14 et 15 orientés de façon sensiblement perpendiculaire audit axe longitudinal .This interruption of the cutout 8 located between two slightly enlarged end portions 8a and 8b forms the base of the pivoting device 5. This is delimited on the other hand by two profiled and symmetrical cutouts 9 and 10 having the shape of curvilinear triangles or of flower profiles and by an enlarged end 11a of a slot 11 which extends along the longitudinal axis of the body 1 and separates the front ends of the branches 3 and 4 from one another. Thus, the device for pivot 5 consists of four short and narrow arms 12, 13, 14 and 15 arranged in a fan shape and connecting the arms 3 and 4 by their front part to the central zone 2 of the body 1. To make the cutouts, tools can be used with controlled command, like EDM for example. In the example shown, the cutting is carried out so that the two arms 12 and 13 are oriented substantially parallel to the longitudinal axis of the clamp, with the two arms 14 and 15 oriented substantially perpendicular to said longitudinal axis.
Un espace 16 légèrement trapézoïdal sépare les extrémités arrières des branches 3 et 4 qui présentent encore chacune une rampe 27 et 28 destinée à coopérer avec un organe de commande 26 (fig. 6) des ouvertures et fermetures de la pince, comme on le verra plus loin. Des butées 32, 33 de limitation de la course d'ouverture de la pince sont également prévues à proximité des extrémités arrières des branches 3 et 4.A slightly trapezoidal space 16 separates the rear ends of the branches 3 and 4 which each still have a ramp 27 and 28 intended to cooperate with a control member 26 (fig. 6) of the openings and closings of the clamp, as will be seen more far. Stops 32, 33 for limiting the opening stroke of the clamp are also provided near the rear ends of the branches 3 and 4.
L'un des becs de serrage 17 est représenté aux fig. 2 à 5. En plan (fig. 2), il présente une forme allongée généralement rectangulaire avec, dans sa partie avant, une face biseautée et un côté latéral oblique. Deux forures 18 et 19 reliées par des découpes transversales respectivement à la face externe et à la face interne du bec sont prévues pour l'engagement de goupilles qui viendront se loger sans jeu avec serrage élastique dans des forures correspondantes de la branche de pince destinée à recevoir le bec. La pointe antérieure du bec 17 présente encore un rebord 20 rectangulaire proéminent vers l'intérieur (fig. 3 et 4), dans lequel est ménagée une gorge 22, réalisée de préférence en vé. Tous ces éléments sont réalisés avec une extrême précision, les becs 17 étant formés dans un acier fortement allié, par exemple au MnCr trempé et revenu.One of the clamping spouts 17 is shown in FIGS. 2 to 5. In plan (fig. 2), it has an elongated generally rectangular shape with, in its front part, a bevelled face and an oblique lateral side. Two holes 18 and 19 connected by transverse cutouts respectively to the external face and to the internal face of the spout are provided for the engagement of pins which will be accommodated without play with elastic clamping in corresponding holes of the clamp branch intended for receive the beak. The front point of the beak 17 also has a rectangular rim 20 projecting inwards (FIGS. 3 and 4), in which a groove 22 is formed, preferably made of vee. All these elements are produced with extreme precision, the spouts 17 being formed in a highly alloyed steel, for example with quenched and tempered MnCr.
Pour montrer le détail du maintien, on a représenté à la fig. 5 le rebord 20 de la fig. 2 à une échelle considérablement agrandie. Les deux flancs 23 et 24 de la gorge 22 sont plans et, dans cet exemple, perpendiculaires l'un à l'autre. L'extrémité d'une arête oblique entre la face biseautée et la face plane supérieure du bec 17 aboutit au centre du flanc 23. La portée cylindrique d'un foret 25 est engagée dans la gorge 22 de façon à appuyer selon quatre génératrices contre les flancs 23 et 24 des pointes des deux becs 17. Selon une variante d'exécution, l'une seulement des pointes 20 des becs de serrage 17 présente une gorge 22 à profil en vé, la pointe 20 de l'autre bec pouvant ne pas comporter de gorge. Selon d'autres variantes d'exécution, l'une ou les deux gorges à profil en vé peuvent être remplacées par des gorges en forme de demi-lune ou de tout autre forme adéquate .To show the detail of the maintenance, there is shown in FIG. 5 the rim 20 of FIG. 2 on a considerably enlarged scale. The two sides 23 and 24 of the groove 22 are planar and, in this example, perpendicular to one another. The end of an oblique edge between the bevelled face and the upper flat face of the spout 17 terminates in the center of the flank 23. The cylindrical surface of a drill 25 is engaged in the groove 22 so as to press along four generatrices against the sides 23 and 24 of the tips of the two nozzles 17. According to an alternative embodiment, only one of the tips 20 of the clamping spouts 17 has a groove 22 with a vee profile, the tip 20 of the other spout may not have a groove. According to other alternative embodiments, one or both grooves with a vee profile can be replaced by grooves in the shape of a half-moon or any other suitable shape.
La pince est représentée dans son ensemble, avec un foret 25, à la fig. 6. Les deux branches 3 et 4, de part et d'autre de la zone centrale 2, se trouvent dans leur position de fermeture, l'organe de commande 26 étant décalé par rapport à l'extrémité arrière des branches et des rampes 27, 28. Cet organe 26 est une bague coulissant sur les flancs extérieurs des branches 3 et 4 et se déplaçant sous l'effet d'un mécanisme qu'il n'est pas nécessaire de décrire.The pliers are shown as a whole, with a drill 25, in FIG. 6. The two branches 3 and 4, on either side of the central zone 2, are in their closed position, the control member 26 being offset relative to the rear end of the branches and ramps 27 , 28. This member 26 is a ring sliding on the outer sides of the branches 3 and 4 and moving under the effect of a mechanism which it is not necessary to describe.
Comme mentionné plus haut, l'espace 16 est légèrement trapézoïdal. De même, les espaces longitudinaux séparant la zone centrale 2 des bras 3 et 4 sont de formes légèrement trapézoïdales. Cet agencement permet aux dits espaces d'absorber les mouvements de rapprochement des bras 3 et 4 de l'ouverture de la pince.As mentioned above, the space 16 is slightly trapezoidal. Similarly, the longitudinal spaces separating the central zone 2 from the arms 3 and 4 are of slightly trapezoidal shapes. This arrangement allows said spaces to absorb the movement of arms 3 and 4 closer to the opening of the clamp.
Les deux becs 17 de la pince sont fixés sur les parties avant des branches 3 et 4 dans des positions qui sont exactement déterminées par des goupilles 29 engagées dans les ouvertures 18 et 19 et les trous correspondant des branches 3 et 4. Comme on le voit à la fig. 6, des plaquettes 30 fixées par des vis 31 assurent la fixation. On comprend que le positionnement des becs sur la pince grâce aux goupilles 29 et aux vis 31 est réalisé en fonction du diamètre de la partie terminale du foret, de manière que dans la position de fermeture, avec l'organe de commande 26 en position décalée, le dispositif de pivotement 5 soit dans un état de flexion élastique assurant le serrage de la partie terminale du foret, de manière à ce que le meulage puisse s'effectuer de façon sûre. Une fois le meulage terminé, l'organe 26 est déplacé sur les rampes 27, 28, ce qui a pour effet d'ouvrir la pince et par conséquent de permettre le dégagement du foret.The two nozzles 17 of the clamp are fixed on the front parts of the branches 3 and 4 in positions which are exactly determined by pins 29 engaged in the openings 18 and 19 and the corresponding holes of the branches 3 and 4. As can be seen in fig. 6, plates 30 fixed by screws 31 ensure the fixing. It is understood that the positioning of the spouts on the clamp by means of the pins 29 and the screws 31 is carried out as a function of the diameter of the terminal part of the drill, so that in the closed position, with the control member 26 in the offset position , the pivoting device 5 is in a state of elastic bending ensuring the clamping of the terminal part of the drill, so that the grinding can be carried out safely. Once the grinding is finished, the member 26 is moved to the ramps 27, 28, which has the effect of opening the clamp and therefore allowing the drill to be released.
Dans l'exemple décrit et représenté sur les figures, l'ensemble est agencé de façon que l'ouverture de la pince soit provoquée par un mouvement vers le bas de 1 ' organe de commande 26. L'ensemble peut bien entendu également être aménagé de façon que l'ouverture de la pince soit provoquée par un mouvement vers le haut de l'organe de commande 26.In the example described and shown in the figures, the assembly is arranged so that the opening of the clamp is caused by a downward movement of one control member 26. The assembly can of course also be arranged so that the opening of the clamp is caused by an upward movement of the control member 26.
En pratique, différents jeux de becs adaptés aux différents forets à meuler peuvent être montés de cas en cas sur une même pince. Cependant, il peut aussi être préférable de prévoir que chaque jeu de becs soit monté à demeure sur des pinces différentes.In practice, different sets of spouts adapted to the different grinding drills can be mounted case by case on the same pliers. However, it may also be preferable to provide that each set of spouts is permanently mounted on different pliers.
Avec le système décrit, le maintien de la pièce est statiquement déterminé, sans action extérieure, sans modification des conditions de prise. L'usure des pièces d'actionnement ni aucune autre perturbation n'ont d'influence sur la prise et le maintien des pièces à meuler. Une précision bien inférieure au micron (10~6 mètre) peut être obtenue en pratique. With the system described, the maintenance of the part is statically determined, without external action, without modification of the gripping conditions. The wear of the actuating parts or any other disturbance has no influence on the grip and maintenance of the parts to be ground. Accuracy well below a micron (10 ~ 6 meter) can be achieved in practice.

Claims

Revendications claims
1. Pince de maintien pour pièce à usiner sur une machine de meulage, notamment pour forets de perçage à partie terminale présentant un grand rapport longueur sur diamètre, comportant un corps de pince (1) en une pièce avec deux branches (3, 4) parallèles ayant une extrémité arrière et une extrémité avant, avec une zone centrale (2) de fixation de la pince sur un support, et des bras élastiquement (12, 13, 14, 15) flexibles découpés dans le corps de manière à assurer la liaison entre la zone centrale et les branches en formant un dispositif de pivotement (5), de sorte qu'un organe de commande (26) agissant sur les extrémités arrières des branches provoque des écartements ou des rapprochements des extrémités avant par pivotement des branches dans le dispositif de pivotement, caractérisée en ce que le dispositif de pivotement (5) est agencé de manière que l'organe de commande (26) étant dans une position de repos, les extrémités avant des branches (3, 4) sont rapprochées et la pince est en position de fermeture, tandis qu'en se déplaçant vers une position active, cet organe de commande déforme le dispositif de pivotement et les extrémités avant des branches sont écartées.1. Holding clamp for workpiece on a grinding machine, in particular for drilling drills with terminal part having a large length to diameter ratio, comprising a clamp body (1) in one piece with two branches (3, 4) parallels having a rear end and a front end, with a central zone (2) for fixing the clamp on a support, and flexible resilient arms (12, 13, 14, 15) cut in the body so as to ensure the connection between the central zone and the branches by forming a pivoting device (5), so that a control member (26) acting on the rear ends of the branches causes the front ends to be moved apart or brought together by pivoting the branches in the pivoting device, characterized in that the pivoting device (5) is arranged so that the control member (26) is in a rest position, the front ends of the arms (3, 4) are t close together and the clamp is in the closed position, while moving towards an active position, this control member deforms the pivoting device and the front ends of the branches are separated.
2. Pince selon la revendication 1, caractérisée en ce que les extrémités avant des branches sont équipées de becs de serrage (17) adaptés aux dimensions de la pièce (25) à maintenir, fixés par des moyens de fixation (29, 30, 31) , de manière à empêcher tout déplacement lors du meulage.2. Pliers according to claim 1, characterized in that the front ends of the branches are equipped with clamping spouts (17) adapted to the dimensions of the part (25) to be held, fixed by fixing means (29, 30, 31 ), so as to prevent any displacement during grinding.
3. Pince selon la revendication 1, caractérisée en ce que le dispositif de pivotement est formé de quatre bras (12, 13, 14, 15) partant sur un côté de la zone centrale, dirigés en éventail, symétriquement pour aboutir sur chacune des branches (3, 4) en deux emplacements voisins, le tout de manière à définir lors de la déformation du dispositif (5) deux axes fictifs de pivotement (a, b) correspondant chacun à l'une des branches . 3. Pliers according to claim 1, characterized in that the pivoting device is formed by four arms (12, 13, 14, 15) extending on one side of the central zone, directed in a fan, symmetrically to terminate on each of the branches (3, 4) in two neighboring locations, the whole so as to define during the deformation of the device (5) two fictitious pivot axes (a, b) each corresponding to one of the branches.
4. Pince selon la revendication 3, caractérisée en ce que le pourtour de la zone centrale (2), les quatre bras (12, 13, 14, 15) et l'espace (11) entre les extrémités avant des branches sont des fentes ou des ouvertures profilées usinées au moyen d'outils à commande contrôlée, dans le corps (1), celui-ci étant en un métal ayant des propriétés de déformation élastique appropriées,4. Pliers according to claim 3, characterized in that the periphery of the central zone (2), the four arms (12, 13, 14, 15) and the space (11) between the front ends of the branches are slots or profiled openings machined by means of controlled control tools, in the body (1), the latter being made of a metal having suitable elastic deformation properties,
5. Pince selon la revendication 4, caractérisée en ce que la zone centrale (2) est une partie de forme rectangulaire du corps (1) avec un trou central pour la fixation au support par vis et quatre trous ajustés avec précision pour le positionnement exact sur le support au moyen de goupilles, les quatre bras du dispositif de pivotement (5) étant rattachés à ladite zone centrale au milieu de son côté tourné vers l'extrémité avant des branches.5. Pliers according to claim 4, characterized in that the central zone (2) is a rectangular-shaped part of the body (1) with a central hole for fixing to the support by screws and four precisely adjusted holes for exact positioning on the support by means of pins, the four arms of the pivoting device (5) being attached to said central zone in the middle of its side facing the front end of the branches.
6. Pince selon la revendication 2, caractérisée en ce que les becs de serrage (17) sont positionnés sur les branches (3, 4) par des goupilles (29) , fixés par des vis (31) et assurés par des plaquettes (30) vissées sur les branches de la pince.6. Pliers according to claim 2, characterized in that the clamping spouts (17) are positioned on the branches (3, 4) by pins (29), fixed by screws (31) and provided by plates (30 ) screwed onto the arms of the pliers.
7. Pince selon la revendication 2 ou la revendication 6, caractérisée en ce que l'une au moins des pointes (20) des becs de serrage (17) présente une gorge (22) à profil en vé ajusté aux dimensions d'une extrémité cylindrique de la pièce à maintenir (25) , de manière que cette partie cylindrique soit soutenue au moins d'un côté selon deux génératrices de son profil .7. Pliers according to claim 2 or claim 6, characterized in that at least one of the points (20) of the clamping spouts (17) has a groove (22) with a v-shaped profile adjusted to the dimensions of one end cylindrical of the part to be held (25), so that this cylindrical part is supported at least on one side along two generatrices of its profile.
8. Pince selon la revendication 7, caractérisée en ce que les pointes (20) des deux becs de serrage (17) présentent des gorges (22) à profil en vé ajustés aux dimensions d'une extrémité cylindrique de la pièce à maintenir. 8. Pliers according to claim 7, characterized in that the points (20) of the two clamping spouts (17) have grooves (22) with a v-shaped profile adjusted to the dimensions of a cylindrical end of the part to be maintained.
PCT/CH2005/000290 2004-06-01 2005-05-24 Gripper for holding a piece to be machined in a grinding machine WO2005118219A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP05740399A EP1750901A1 (en) 2004-06-01 2005-05-24 Gripper for holding a piece to be machined in a grinding machine
JP2007513646A JP2008500908A (en) 2004-06-01 2005-05-24 Tip-fixed steady rest clamp for holding a member to be polished by a polishing machine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH9212004 2004-06-01
CH921/04 2004-06-01

Publications (1)

Publication Number Publication Date
WO2005118219A1 true WO2005118219A1 (en) 2005-12-15

Family

ID=34967405

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CH2005/000290 WO2005118219A1 (en) 2004-06-01 2005-05-24 Gripper for holding a piece to be machined in a grinding machine

Country Status (6)

Country Link
EP (1) EP1750901A1 (en)
JP (1) JP2008500908A (en)
KR (1) KR20070024662A (en)
CN (1) CN100519067C (en)
TW (1) TW200607602A (en)
WO (1) WO2005118219A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011052976A1 (en) 2011-08-25 2013-02-28 Feinmechanik Michael Deckel Gmbh & Co. Kg Gripping head for use with gripping arm for feeding grinding machine for processing cylindrical work pieces, has gripper which comprises holding finger and gripping finger to receive work piece between holding finger and gripping finger

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100964322B1 (en) * 2008-04-29 2010-06-17 김은옥 Anti-Vibration Unit for Car Brake Disk Grinding
TW201127547A (en) * 2010-02-10 2011-08-16 Innovation Prec Inc Fixture
EP2540438B1 (en) * 2011-07-01 2013-05-29 SMW-AUTOBLOK Spannsysteme GmbH Stationary support
CN103182678B (en) * 2011-12-28 2015-03-25 钜威自动化股份有限公司 Holding device for micro drill point grinder
JP5345712B2 (en) * 2012-01-20 2013-11-20 鉅威自動化股▲分▼有限公司 Tightening device for micro drill polishing machine
KR200468757Y1 (en) * 2012-02-14 2013-09-06 그리 윈 오토메이션 컴퍼니 리미티드 Tightening apparatus of microdrill polishing machine
TWI681835B (en) * 2018-04-09 2020-01-11 瑞士商瑞士路勞曼迪有限公司 Method and grinding machine for fabricating a workpiece comprising a helical groove and a program for controlling the grinding machine

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0299915A1 (en) * 1987-07-15 1989-01-18 SAFAG AG Maschinen- und Pumpenfabrik Method and apparatus for machining workpieces

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5822799A (en) * 1981-08-03 1983-02-10 三菱電機株式会社 Control system for mass characteristic of artificial satellite
IL64173A (en) * 1981-10-30 1984-03-30 Etm Eng Tool Mfg Co Ltd Machine for grinding points of drills
JPS6393552A (en) * 1986-10-08 1988-04-23 Toyo Mach Kk Drill grinding machine
SE9400282L (en) * 1994-01-28 1995-07-29 Cme Blasting & Mining Equip Retaining
CN2216881Y (en) * 1995-01-14 1996-01-10 陈朝欣 Frame for supporting tools
US5649853A (en) * 1996-07-23 1997-07-22 Kuo; Chun-Lin Drill bit grinding machine
JP2002301640A (en) * 2001-03-30 2002-10-15 Toyo Engineering Kk Drill grinding oscillating loader

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0299915A1 (en) * 1987-07-15 1989-01-18 SAFAG AG Maschinen- und Pumpenfabrik Method and apparatus for machining workpieces

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011052976A1 (en) 2011-08-25 2013-02-28 Feinmechanik Michael Deckel Gmbh & Co. Kg Gripping head for use with gripping arm for feeding grinding machine for processing cylindrical work pieces, has gripper which comprises holding finger and gripping finger to receive work piece between holding finger and gripping finger
DE102011052976B4 (en) * 2011-08-25 2014-03-13 Feinmechanik Michael Deckel Gmbh & Co. Kg Gripping head for feeding a grinding machine

Also Published As

Publication number Publication date
TW200607602A (en) 2006-03-01
CN1980770A (en) 2007-06-13
CN100519067C (en) 2009-07-29
KR20070024662A (en) 2007-03-02
JP2008500908A (en) 2008-01-17
EP1750901A1 (en) 2007-02-14

Similar Documents

Publication Publication Date Title
WO2005118219A1 (en) Gripper for holding a piece to be machined in a grinding machine
EP1796871B9 (en) Device for clamping a tool insert in a grinding machine
EP2197625B1 (en) Precision guiding device in a machine for machining cylindrical parts
EP1885518B1 (en) Spring collet
CA2275958A1 (en) Pilot tool for centring and clamping
EP1317329A2 (en) Boring head
EP0841114B1 (en) Clamping device for toolholders with hollow cone
EP2500137B1 (en) Rapid clamping pin
EP0869862B1 (en) Adjustable multiple slip-joint pliers
EP1778422B1 (en) Crimping tool
EP3843922A1 (en) Gripper having an interchangeable head, and tool comprising same
EP0262998B1 (en) Drilling device for wooden panels so as to assemble them by using dowels
EP2648877B1 (en) Clamping/releasing flange
EP1240961A1 (en) Cutting tool
EP1331053B1 (en) Guiding member for automatic lathe
EP1216120B1 (en) Rotational driving tool for screwing member
WO2000029152A1 (en) Device for piercing lockwire holes
FR2758489A3 (en) METAL SHEARS
FR2843904A1 (en) Assembly for cutting long rods into shorter sections of predetermined length, e.g. stakes or journals, includes pliers device with pivotal cutting jaws and a stop device on a perpendicular rail for determining length of cut sections
FR2660887A1 (en) Device for micrometric adjustment of the cutting diameter of a machining tool having at least two inserts (tips)
CH719160A1 (en) Clamping pliers for machine tools.
EP4252976A1 (en) Parallel type gripper with referencing of one of the two jaws
EP2349621B1 (en) Bow saw mounting and corresponding bow saw
FR2720323A1 (en) Device for fixing a blow-molding end of an extrusion-blow molding machine to produce hollow bodies.
EP0231852A2 (en) Chuck with means for regulating the position of a tool

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KM KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NG NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SM SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LT LU MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
WWE Wipo information: entry into national phase

Ref document number: 2007513646

Country of ref document: JP

NENP Non-entry into the national phase

Ref country code: DE

WWW Wipo information: withdrawn in national office

Country of ref document: DE

WWE Wipo information: entry into national phase

Ref document number: 2005740399

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: 1020067027533

Country of ref document: KR

WWE Wipo information: entry into national phase

Ref document number: 200580022647.3

Country of ref document: CN

WWP Wipo information: published in national office

Ref document number: 2005740399

Country of ref document: EP

WWP Wipo information: published in national office

Ref document number: 1020067027533

Country of ref document: KR