EP0437412A1 - Machine for sharpening twist drills - Google Patents

Machine for sharpening twist drills Download PDF

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Publication number
EP0437412A1
EP0437412A1 EP19910420011 EP91420011A EP0437412A1 EP 0437412 A1 EP0437412 A1 EP 0437412A1 EP 19910420011 EP19910420011 EP 19910420011 EP 91420011 A EP91420011 A EP 91420011A EP 0437412 A1 EP0437412 A1 EP 0437412A1
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EP
European Patent Office
Prior art keywords
support
cradle
machine according
grinding wheel
machine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19910420011
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German (de)
French (fr)
Inventor
Bernard Maurin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EMMANUEL MAURIN S.A.
Original Assignee
EMMANUEL MAURIN SA
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Filing date
Publication date
Application filed by EMMANUEL MAURIN SA filed Critical EMMANUEL MAURIN SA
Publication of EP0437412A1 publication Critical patent/EP0437412A1/en
Withdrawn legal-status Critical Current

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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
    • 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
    • B24B3/26—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of drills of the point of twist drills
    • B24B3/32—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of drills of the point of twist drills for thinning the point
    • 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
    • B24B3/26—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of drills of the point of twist drills
    • B24B3/28—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of drills of the point of twist drills by swivelling the drill around an axis angularly to the drill axis

Definitions

  • the present invention relates to a machine for sharpening twist drills. In order to preserve all their qualities in the drill, it is essential to sharpen them very regularly, sometimes after only a few hours of use.
  • a known machine comprises a grinding wheel with a horizontal axis, and a plate with a vertical axis, this plate being mounted pivoting about its axis, and associated with a carriage movable parallel to the axis of the grinding wheel, with the action of a cam. , so that during the pivoting of the plate around its axis, there occurs a simultaneous movement of advance from the plate to the grinding wheel.
  • a tool holder support pivoting about a horizontal axis, that is to say parallel to the plate, so as to adjust the tip angle of the drill to be sharpened with locking in the desired position .
  • Tool holders suitable for the diameters of the drills to be sharpened should be fitted, these tool holders being, for drills with diameters varying from 1.5 to 26 mm, four in number. It is therefore advisable, before carrying out the sharpening of a drill, to choose the two half-shells constituting a tool holder, to position them on their support, and to position the drill approximately visually inside the two shells, with the risks of modifying the draft by turning the bit more or less in the tool holder.
  • the cradle After angular positioning using a vernier, the cradle is rapidly advanced on its support and then a micrometric advance towards the grinding wheel. Firstly, one of the edges of the edge is machined, after which the tool holder is turned over on its cradle to perform the machining of the second edge. It is therefore necessary to have an extremely precise tool holder because the fact that we turn it over to sharpen one edge and then the other, the slightest inaccuracy between a reference face and the V-shaped face serving supporting the drill may lead to major errors.
  • the drill is mounted on another support to proceed with a thinning operation of the core, the support device also having specific adjustments. It results from this structure of numerous drawbacks, and in particular the multiplicity of manipulations, the large number of adjustments being instinctively approximated, as well as the need to have available for training the wheel of a motor with two directions of rotation, a first direction for sharpening and a second direction for thinning the core. In addition, when you have a large drill, there is a risk of the latter and its tool holder tipping over with respect to the support cradle, given the rear overhang.
  • the present invention aims to remedy these drawbacks by providing a machine for sharpening twist drills, of simple design, of compact structure, allowing all of the sharpening operations to be carried out while leaving the drill mounted in the same door. -tools, without requiring turning over this tool holder.
  • the machine it relates to of the type comprising a grinding wheel with a horizontal axis driven in rotation by a motor, a support mounted angularly adjustable around a horizontal axis, and actuable in rotation around a vertical axis with modification.
  • the support cradle is integral with an annular element in the form of a bearing inside which is mounted a pivoting ring with adjustment of the angular position and locking in the desired position, this ring itself serving for mounting with the possibility of pivoting and locking in indexed positions of the tool holder.
  • This device is interesting because it allows by pivoting the crown to adjust the cutting angle, then after sharpening one of the edges, to sharpen the other to the other edges by pivoting the tool holder inside the crown at an angle of 180 ° in the case of a drill with two edges.
  • the tool holder has at its front end a body having a wedge-shaped section, this section decreasing from the rear to the front, in which the jaws consisting of two parts are slidably mounted. comprising openings in V vis-à-vis and having transverse recesses allowing their approximation by interpenetration, during their advance towards the narrowed part of the body. It is thus possible, using a single tool holder, to vary the opening between the two jaws from a value varying from 0 to a value up to 32 mm. This solution is interesting because it avoids the tool holder changes that are known with traditional machines. This machine is therefore particularly advantageous since the drill bit remains inside the tool holder throughout the sharpening operation, which considerably limits the risk of error and facilitates the operator's work.
  • the support cradle is mounted inside a slide in the form of an arc of a circle, the center of which faces upwards, the lower part of this cradle having a shape complementary to that of the slide, means being provided to ensure the rotational driving of the cradle inside the curved slide, and other means ensuring the blocking in the chosen position.
  • the means ensuring the rotation drive can for example be constituted by a rack, and the rotation lock can be achieved using a pressure screw.
  • the support of the cradle is mounted adjustable in height with respect to the plate with which it is associated.
  • the support is mounted at the upper end of a vertical column adjustable axially with respect to the plate, and passing through the support frame of the machine at the level of a lumen which the latter comprises.
  • the support of the cradle is pivotally mounted on the upper end of the column with the interposition of an eccentric which ensures during the rotation of the support of the cradle with respect to the plate a movement movement towards the grinding wheel.
  • the plate is pivotally mounted on the support frame about a vertical axis, with locking in the desired position, a light in an arc of a circle being provided to allow the passage of the column at the upper end of which is mounted the cradle support.
  • the pivoting of the plate carrying all the members defined above with respect to the support frame makes it possible, at the end of sharpening, to carry out the operation of thinning the cutting edges, without having to use a specific device.
  • the grinding wheel and its motor are mounted on the support frame with the interposition of two crossed slides associated with means for adjusting their position by screw and indexing wheel.
  • this machine comprises a support frame 2 on a raised part of which is mounted a motor 3 driving in rotation about an axis 4, a grinding wheel 5, a diamond device 6 of known type being provided for dress the wheel.
  • the motor 3 and the grinding wheel 5 are mounted on the support frame with the interposition of two crossed slides 7, 8, allowing adjustments using screws and handwheels 9, 10 and 12, 13 respectively.
  • a light 14 in the form of an arc of a circle, above which is mounted a plate 15 pivoting about an axis on which the light 14 is centered, and lockable in the desired position at the using a lever 16.
  • the upper part of the support plate 22 forms a T-shaped slide 24 arranged in an arc of a circle whose center is located above the slide, this slide serving housing a curved cradle 25, with the possibility of adjusting this cradle from a button 26, using a rack system, and locking in the desired angular position by means of a screw pressure 27.
  • annular element 28 On the cradle 25 is mounted an annular element 28 forming a bearing for a pivoting crown 29 with the possibility of adjusting its angular position using a button 30.
  • a button 30 Inside the crown 29, the door is pivotally mounted -tools 32.
  • This tool holder 32 can be locked with respect to the crown in the desired angular position with the possibility of indexing by penetration of a finger secured to a button 33, inside orifices arranged in the crown.
  • the front end of the tool holder has guide elements constituted by slides 34 converging towards the front, used for mounting two jaws 35 of V-section, the openings of the V being opposite one another , these two jaws having transverse recesses 36 allowing them to interpenetrate more or less to vary the opening between the two jaw bottoms which can vary from a value of 0 to 32 mm, the axial displacement of the jaws being produced by the knurled ring 37 placed at the rear of the device.
  • the sharpening of a drill 38 is carried out in the following way: the drill is introduced inside the tool holder by the front or by the back of the latter according to its size.
  • the tip angle is then adjusted by pivoting the cradle 25 relative to the support 22.
  • the height adjustment is carried out by vertical positioning of the column 19.
  • the cutting angle is then adjusted by pivoting of the crown 29 relative to the bearing 28.
  • the position of the grinding wheel is then adjusted laterally and in depth, after which the grinding wheel is rotated to sharpen a first edge.
  • the tool holder is pivoted relative to the crown 29 by an angle of 180 °, if the drill to be sharpened has two edges.
  • the plate 15 relative to the support frame, the drill is brought into a new position relative to the grinding wheel, allowing the thinning of the core.
  • the invention brings a great improvement to the existing technique, by providing a very compact machine allowing, using a single tool holder, to sharpen drills whose diameter can vary from 0 to 32 mm, and allowing all the sharpening operations including the thinning of the core to be carried out, without changing the tool holder, and without having to manually turn the tool holder over and re-attach it to its support.
  • This results in great simplicity of use, as well as great speed, and excellent quality of the result obtained since the random practices of known machines are completely avoided.

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

Abstract

Machine of the type comprising a grinding wheel of horizontal axis, driven in rotation by a motor, and a support mounted so as to be angularly adjustable about a horizontal axis and actuable in rotation about a vertical axis, with its distance from the grinding wheel being modified during the rotational movement. This machine is characterised in that the supporting cradle (25) is fixed to a bearing-shaped annular element (28), on the inside of which is mounted a pivoting ring (29) with adjustment of the angular position and blocking in the desired position, this ring serving itself for mounting with the possibility of pivoting and of blocking in indexed positions of the toolholder (32). <IMAGE>

Description

La présente invention a pour objet une machine pour l'affûtage de forets hélicoïdaux. Afin de préserver au foret toutes leurs qualités, il est indispensable de les affûter de façon très régulière, parfois après quelques heures d'utilisation seulement.The present invention relates to a machine for sharpening twist drills. In order to preserve all their qualities in the drill, it is essential to sharpen them very regularly, sometimes after only a few hours of use.

Il existe déjà des machines pour l'affûtage de forets hélicoïdaux.There are already machines for sharpening twist drills.

Une machine connue comporte une meule d'axe horizontal, et un plateau d'axe vertical, ce plateau étant monté pivotant autour de son axe, et associé à un chariot déplaçable parallèlement à l'axe de la meule, avec action d'une came, de telle sorte que lors du pivotement du plateau autour de son axe, il se produise un mouvement simultané d'avance du plateau vers la meule.A known machine comprises a grinding wheel with a horizontal axis, and a plate with a vertical axis, this plate being mounted pivoting about its axis, and associated with a carriage movable parallel to the axis of the grinding wheel, with the action of a cam. , so that during the pivoting of the plate around its axis, there occurs a simultaneous movement of advance from the plate to the grinding wheel.

Sur le plateau est monté un support de porte-outils, pivotant autour d'un axe horizontal, c'est-à-dire parallèle au plateau, de façon à régler l'angle de pointe du foret à affûter avec blocage dans la position souhaitée. Il convient de monter des porte-outils adaptés aux diamètres des forets à affûter, ces porte-outils étant, pour des forets de diamètres variant de 1,5 à 26 mm, au nombre de quatre. Il convient donc avant de réaliser l'affûtage d'un foret de choisir les deux demi-coquilles constitutives d'un porte-outils, de les positionner sur leur support, et de positionner approximativement de façon visuelle le foret à l'intérieur des deux coquilles, avec les risques qu'il y a de modifier la dépouille en tournant plus ou moins le foret dans le porte-outils. Après positionnement angulaire à l'aide d'un vernier, il est procédé à l'avance rapide du berceau sur son support puis à une avance micrométrique vers la meule. Dans un premier temps il est procédé à un usinage de l'un des bords de l'arête, après quoi le porte-outils est retourné sur son berceau pour réaliser l'usinage du second bord. Il est donc nécessaire d'avoir un porte-outils d'une extrême précision car du fait que l'on retourne celui-ci pour affûter un bord puis l'autre, la moindre inexactitude entre une face de référence et la face en V servant d'appui au foret risque de conduire à des erreurs importantes.On the plate is mounted a tool holder support, pivoting about a horizontal axis, that is to say parallel to the plate, so as to adjust the tip angle of the drill to be sharpened with locking in the desired position . Tool holders suitable for the diameters of the drills to be sharpened should be fitted, these tool holders being, for drills with diameters varying from 1.5 to 26 mm, four in number. It is therefore advisable, before carrying out the sharpening of a drill, to choose the two half-shells constituting a tool holder, to position them on their support, and to position the drill approximately visually inside the two shells, with the risks of modifying the draft by turning the bit more or less in the tool holder. After angular positioning using a vernier, the cradle is rapidly advanced on its support and then a micrometric advance towards the grinding wheel. Firstly, one of the edges of the edge is machined, after which the tool holder is turned over on its cradle to perform the machining of the second edge. It is therefore necessary to have an extremely precise tool holder because the fact that we turn it over to sharpen one edge and then the other, the slightest inaccuracy between a reference face and the V-shaped face serving supporting the drill may lead to major errors.

En fin d'affûtage, on monte le foret sur un autre support pour procéder à une opération d'amincissement de l'âme, le dispositif support possédant lui aussi des réglages spécifiques. Il résulte de cette structure de nombreux inconvénients, et notamment la multiplicité des manipulations, le nombre important de réglages se faisant instinctivement de façon approximative, ainsi que la nécessité de disposer pour l'entraînement de la meule d'un moteur à deux sens de rotation, un premier sens pour l'affûtage et un second sens pour l'amincissement de l'âme. En outre lorsque l'on a un gros foret il se produit, compte tenu du porte à faux vers l'arrière, un risque de basculement de celui-ci et de son porte-outils par rapport au berceau-support.At the end of sharpening, the drill is mounted on another support to proceed with a thinning operation of the core, the support device also having specific adjustments. It results from this structure of numerous drawbacks, and in particular the multiplicity of manipulations, the large number of adjustments being instinctively approximated, as well as the need to have available for training the wheel of a motor with two directions of rotation, a first direction for sharpening and a second direction for thinning the core. In addition, when you have a large drill, there is a risk of the latter and its tool holder tipping over with respect to the support cradle, given the rear overhang.

La présente invention vise à remédier à ces inconvénients en fournissant une machine pour l'affûtage de forets hélicoïdaux, de conception simple, de structure compacte, permettant la réalisation de la totalité des opérations d'affûtage tout en laissant le foret monté dans le même porte-outils, sans nécessiter de retournement de ce porte-outils.The present invention aims to remedy these drawbacks by providing a machine for sharpening twist drills, of simple design, of compact structure, allowing all of the sharpening operations to be carried out while leaving the drill mounted in the same door. -tools, without requiring turning over this tool holder.

A cet effet, la machine qu'elle concerne du type comportant une meule d'axe horizontal entraînée en rotation par un moteur, un support monté réglable angulairement autour d'un axe horizontal, et actionnable en rotation autour d'un axe vertical avec modification de sa distance par rapport à la meule au cours du mouvement de rotation, est caractérisée en ce que le berceau support est solidaire d'un élément annulaire en forme de palier à l'intérieur duquel est montée une couronne pivotante avec réglage de la position angulaire et blocage dans la position désirée, cette couronne servant elle-même au montage avec possibilité de pivotement et de blocage dans des positions indexées du porte-outils.To this end, the machine it relates to of the type comprising a grinding wheel with a horizontal axis driven in rotation by a motor, a support mounted angularly adjustable around a horizontal axis, and actuable in rotation around a vertical axis with modification. from its distance from the grinding wheel during the rotational movement, is characterized in that the support cradle is integral with an annular element in the form of a bearing inside which is mounted a pivoting ring with adjustment of the angular position and locking in the desired position, this ring itself serving for mounting with the possibility of pivoting and locking in indexed positions of the tool holder.

Cet appareil est intéressant car il permet par pivotement de la couronne de régler l'angle de coupe, puis après affûtage de l'un des bords, de procéder à l'affûtage de l'autre au des autres bords par pivotement du porte-outils à l'intérieur de la couronne d'un angle de 180° dans le cas d'un foret à deux bords.This device is interesting because it allows by pivoting the crown to adjust the cutting angle, then after sharpening one of the edges, to sharpen the other to the other edges by pivoting the tool holder inside the crown at an angle of 180 ° in the case of a drill with two edges.

Selon une caractéristique de l'invention, le porte-outils présente à son extrémité avant un corps possèdant une section en forme de coin, cette section diminuant de l'arrière vers l'avant, dans lequel sont montés coulissants les mors constitués par deux pièces comportant des ouvertures en V en vis-à-vis et présentant des évidements transversaux permettant leur rapprochement par interpénétration, lors de leur avance vers la partie rétrécie du corps. Il est ainsi possible, à l'aide d'un seul porte-outils, de faire varier l'ouverture entre les deux mors d'une valeur variant de 0 à une valeur pouvant atteindre 32 mm. Cette solution est intéressante car évitant les changements de porte-outils que l'on connaît avec les machines traditionnelles. Cette machine est donc particulièrement intéressante puisque le foret demeure à l'intérieur du porte-outils pendant toute l'opération d'affûtage, ce qui limite considérablement les risques d'erreur et facilite le travail de l'opérateur.According to a characteristic of the invention, the tool holder has at its front end a body having a wedge-shaped section, this section decreasing from the rear to the front, in which the jaws consisting of two parts are slidably mounted. comprising openings in V vis-à-vis and having transverse recesses allowing their approximation by interpenetration, during their advance towards the narrowed part of the body. It is thus possible, using a single tool holder, to vary the opening between the two jaws from a value varying from 0 to a value up to 32 mm. This solution is interesting because it avoids the tool holder changes that are known with traditional machines. This machine is therefore particularly advantageous since the drill bit remains inside the tool holder throughout the sharpening operation, which considerably limits the risk of error and facilitates the operator's work.

Selon une autre caractéristique de l'invention, le berceau support est monté à l'intérieur d'une glissière en forme d'arc de cercle dont le centre est tourné vers le haut, la partie inférieure de ce berceau possédant une forme complémentaire de celle de la glissière, des moyens étant prévus pour assurer l'entraînement en rotation du berceau à l'intérieur de la glissière courbe, et d'autres moyens assurant le blocage dans la position choisie. Les moyens assurant l'entraînement en rotation peuvent par exemple être constitués par une crémaillère, et le blocage en rotation être réalisé à l'aide d'une vis de pression.According to another characteristic of the invention, the support cradle is mounted inside a slide in the form of an arc of a circle, the center of which faces upwards, the lower part of this cradle having a shape complementary to that of the slide, means being provided to ensure the rotational driving of the cradle inside the curved slide, and other means ensuring the blocking in the chosen position. The means ensuring the rotation drive can for example be constituted by a rack, and the rotation lock can be achieved using a pressure screw.

Avantageusement, le support du berceau est monté réglable en hauteur vis-à-vis du plateau auquel il est associé. Selon une possibilité, le support est monté à l'extrémité supérieure d'une colonne verticale réglable axialement par rapport au plateau, et traversant le bâti-support de la machine au niveau d'une lumière que comporte celui-ci.Advantageously, the support of the cradle is mounted adjustable in height with respect to the plate with which it is associated. According to one possibility, the support is mounted at the upper end of a vertical column adjustable axially with respect to the plate, and passing through the support frame of the machine at the level of a lumen which the latter comprises.

Conformément à une autre caractéristique de l'invention, le support du berceau est monté pivotant sur l'extrémité supérieure de la colonne avec interposition d'un excentrique qui assure lors de la rotation du support du berceau vis-à-vis du plateau un mouvement de déplacement en direction de la meule.According to another characteristic of the invention, the support of the cradle is pivotally mounted on the upper end of the column with the interposition of an eccentric which ensures during the rotation of the support of the cradle with respect to the plate a movement movement towards the grinding wheel.

Avantageusement le plateau est monté pivotant sur le bâti-support autour d'un axe vertical, avec blocage dans la position souhaitée, une lumière en arc de cercle étant prévue pour permettre le passage de la colonne à l'extrémité supérieure de laquelle est montée le support du berceau. Le pivotement du plateau portant l'ensemble des organes définis précédemment par rapport au bâti-support permet, en fin d'affûtage, de réaliser l'opération d'amincissement des bords de coupe, sans avoir à utiliser un dispositif spécifique.Advantageously, the plate is pivotally mounted on the support frame about a vertical axis, with locking in the desired position, a light in an arc of a circle being provided to allow the passage of the column at the upper end of which is mounted the cradle support. The pivoting of the plate carrying all the members defined above with respect to the support frame makes it possible, at the end of sharpening, to carry out the operation of thinning the cutting edges, without having to use a specific device.

Enfin, la meule et son moteur sont montées sur le bâti-support avec interposition de deux glissières croisées associées à des moyens de réglage de leur position par vis et volant d'indexation.Finally, the grinding wheel and its motor are mounted on the support frame with the interposition of two crossed slides associated with means for adjusting their position by screw and indexing wheel.

De toute façon l'invention sera bien comprise à l'aide de la description qui suit, en référence au dessin schématique annexé, représentant à titre d'exemple non limitatif, une forme d'exécution de cette machine:

  • Figure 1 en est une vue en perspective;
  • Figure 2 en est une vue en coupe longitudinale;
  • Figure 3 en est une vue de dessus.
In any case, the invention will be clearly understood with the aid of the description which follows, with reference to the appended schematic drawing, representing by way of nonlimiting example, an embodiment of this machine:
  • Figure 1 is a perspective view;
  • Figure 2 is a longitudinal sectional view;
  • Figure 3 is a top view.

Comme montré à la figure 1, cette machine comprend un bâti-support 2 sur une partie surélevée duquel est monté un moteur 3 entraînant en rotation autour d'un axe 4, une meule 5, un dispositif à diamant 6 de type connu étant prévu pour réaliser le dressage de la meule. Le moteur 3 et la meule 5 sont montées sur le bâti-support avec interposition de deux glissières croisées 7, 8, permettant des réglages à l'aide de vis et volants 9,10 et 12,13 respectivement. Dans le bâti-support est ménagé une lumière 14 en forme d'arc de cercle, au-dessus de laquelle est monté un plateau 15 pivotant autour d'un axe sur lequel est centrée la lumière 14, et blocable dans la position désirée à l'aide d'un levier 16.As shown in FIG. 1, this machine comprises a support frame 2 on a raised part of which is mounted a motor 3 driving in rotation about an axis 4, a grinding wheel 5, a diamond device 6 of known type being provided for dress the wheel. The motor 3 and the grinding wheel 5 are mounted on the support frame with the interposition of two crossed slides 7, 8, allowing adjustments using screws and handwheels 9, 10 and 12, 13 respectively. In the support frame is provided a light 14 in the form of an arc of a circle, above which is mounted a plate 15 pivoting about an axis on which the light 14 is centered, and lockable in the desired position at the using a lever 16.

Il est également possible de réaliser l'indexation de la position du plateau par rapport au bâti-support grâce à un doigt 17 d'indexation susceptible d'être engagé dans des encoches 18 du bâti-support. Le plateau 15 est traversé par une colonne 19 qui traverse également la lumière 14, cette colonne verticale 19 étant réglable en hauteur par l'intermédiaire d'un volant 20, grâce à un système à crémaillère, la partie supérieure de cette colonne servant à l'articulation d'un support 22 pivotant avec interposition d'un excentrique 23. La partie supérieure du plateau support 22 forme une glissière 24 en T disposée selon un arc de cercle dont le centre est situé au-dessus de la glissière, cette glissière servant au logement d'un berceau courbe 25, avec possibilité de réglage de ce berceau à partir d'un bouton 26, à l'aide d'un système à crémaillère, et blocage dans la position angulaire désirée par l'intermédiaire d'une vis de pression 27.It is also possible to carry out the indexing of the position of the plate with respect to the support frame by means of an indexing finger 17 capable of being engaged in notches 18 of the support frame. The plate 15 is crossed by a column 19 which also passes through the lumen 14, this vertical column 19 being adjustable in height by means of a flywheel 20, by means of a rack system, the upper part of this column serving for the articulation of a pivoting support 22 with interposition of an eccentric 23. The upper part of the support plate 22 forms a T-shaped slide 24 arranged in an arc of a circle whose center is located above the slide, this slide serving housing a curved cradle 25, with the possibility of adjusting this cradle from a button 26, using a rack system, and locking in the desired angular position by means of a screw pressure 27.

Sur le berceau 25 est monté un élément annulaire 28 formant un palier pour une couronne 29 pivotante avec possibilité de réglage de sa position angulaire à l'aide d'un bouton 30. A l'intérieur de la couronne 29, est monté pivotant le porte-outils 32. Ce porte-outils 32 peut être bloqué vis-à-vis de la couronne dans la position angulaire souhaitée avec possibilité d'indexation par pénétration d'un doigt solidaire d'un bouton 33, à l'intérieur d'orifices ménagés dans la couronne.On the cradle 25 is mounted an annular element 28 forming a bearing for a pivoting crown 29 with the possibility of adjusting its angular position using a button 30. Inside the crown 29, the door is pivotally mounted -tools 32. This tool holder 32 can be locked with respect to the crown in the desired angular position with the possibility of indexing by penetration of a finger secured to a button 33, inside orifices arranged in the crown.

L'extrémité avant du porte-outils possède des éléments de guidage constitués par des glissières 34 convergentes vers l'avant, servant au montage de deux mors 35 de section en V, les ouvertures des V étant en regard l'une de l'autre, ces deux mors possédant des évidements tranversaux 36 leur permettant de s'interpénétrer plus ou moins pour faire varier l'ouverture entre les deux fonds de mors qui peut varier d'une valeur de 0 à 32 mm, le déplacement axial des mors étant réalisé par la bague moletée 37 disposée à l'arrière de l'appareil. L'affûtage d'un foret 38 est réalisé de la façon suivante: le foret est introduit à l'intérieur du porte-outils par l'avant ou par l'arrière de celui-ci suivant sa taille. Il est tout d'abord procédé à un positionnement angulaire du foret en tenant compte de repères extérieurs, puis au blocage de celui-ci. Il est alors procédé au réglage de l'angle de pointe par pivotement du berceau 25 par rapport au support 22. Le réglage en hauteur est réalisé par positionnement vertical de la colonne 19. Il est alors procédé au réglage de l'angle de coupe par pivotement de la couronne 29 par rapport au palier 28. Il est ensuite procédé au réglage de la position de la meule latéralement et en profondeur, après quoi, la meule est entraînée en rotation pour réaliser l'affûtage d'un premier bord. En fin d'affûtage, il est procédé au pivotement du porte-outils par rapport à la couronne 29 d'un angle de 180°, si le foret à affûter possède deux bords. Enfin par pivotement du plateau 15 par rapport au bâti-support, le foret est amené dans une nouvelle position par rapport à la meule, permettant l'amincissement de l'âme.The front end of the tool holder has guide elements constituted by slides 34 converging towards the front, used for mounting two jaws 35 of V-section, the openings of the V being opposite one another , these two jaws having transverse recesses 36 allowing them to interpenetrate more or less to vary the opening between the two jaw bottoms which can vary from a value of 0 to 32 mm, the axial displacement of the jaws being produced by the knurled ring 37 placed at the rear of the device. The sharpening of a drill 38 is carried out in the following way: the drill is introduced inside the tool holder by the front or by the back of the latter according to its size. It is first of all proceeded to an angular positioning of the drill while taking account of external marks, then to the locking of this one. The tip angle is then adjusted by pivoting the cradle 25 relative to the support 22. The height adjustment is carried out by vertical positioning of the column 19. The cutting angle is then adjusted by pivoting of the crown 29 relative to the bearing 28. The position of the grinding wheel is then adjusted laterally and in depth, after which the grinding wheel is rotated to sharpen a first edge. At the end of sharpening, the tool holder is pivoted relative to the crown 29 by an angle of 180 °, if the drill to be sharpened has two edges. Finally by pivoting the plate 15 relative to the support frame, the drill is brought into a new position relative to the grinding wheel, allowing the thinning of the core.

Comme il ressort de ce qui précède, l'invention apporte une grande amélioration à la technique existante, en fournissant une machine très compacte permettant à l'aide d'un seul porte-outils de réaliser l'affûtage de forets dont le diamètre peut varier de 0 à 32 mm, et en permettant de réaliser toutes les opérations d'affûtage y compris l'amincissement de l'âme, sans changer de porte-outils, et sans avoir à retourner manuellement le porte-outils et à le refixer sur son support. Il en résulte une grande simplicité d'utilisation, ainsi qu'une grande rapidité, et une excellente qualité du résultat obtenu puisque les pratiques aléatoires des machines connues sont totalement évitées.As is clear from the above, the invention brings a great improvement to the existing technique, by providing a very compact machine allowing, using a single tool holder, to sharpen drills whose diameter can vary from 0 to 32 mm, and allowing all the sharpening operations including the thinning of the core to be carried out, without changing the tool holder, and without having to manually turn the tool holder over and re-attach it to its support. This results in great simplicity of use, as well as great speed, and excellent quality of the result obtained since the random practices of known machines are completely avoided.

Comme il va de soi, l'invention ne se limite pas à la seule forme d'exécution de cette machine décrite ci-dessus à titre d'exemple, elle en embrasse, au contaire, toutes les variantes de réalisation.As it goes without saying, the invention is not limited to the sole embodiment of this machine described above by way of example, it embraces, in content, all the variant embodiments.

Claims (8)

Machine pour l'affûtage de forets hélicoïdaux du type comportant une meule d'axe horizontal entraînée en rotation par un moteur, un support monté réglable angulairement autour d'un axe horizontal, et actionnable en rotation autour d'un axe vertical avec modification de sa distance par rapport à la meule au cours du mouvement de rotation, caractérisée en ce que le berceau support (25) est solidaire d'un élément annulaire (28) en forme de palier à l'intérieur duquel est montée une couronne pivotante (29) avec réglage de la position angulaire et blocage dans la position désirée, cette couronne servant elle-même au montage avec possibilité de pivotement et de blocage dans des positions indexées du porte-outils (32).Machine for sharpening twist drills of the type comprising a grinding wheel of horizontal axis driven in rotation by a motor, a support mounted angularly adjustable around a horizontal axis, and actuable in rotation around a vertical axis with modification of its distance from the grinding wheel during the rotational movement, characterized in that the support cradle (25) is integral with an annular element (28) in the form of a bearing inside which is mounted a pivoting crown (29) with angular position adjustment and locking in the desired position, this ring itself serving for mounting with the possibility of pivoting and locking in indexed positions of the tool holder (32). Machine selon la revendication 1, caractérisée en ce que le porte-outils présente à son extrémité avant un corps (34) possèdant une section en forme de coin, cette section diminuant de l'arrière vers l'avant, dans lequel sont montés coulissants les mors (35) constitués par deux pièces comportant des ouvertures en V en vis-à-vis et présentant des évidements tranversaux (36) permettant leur rapprochement par interpénétration, lors de leur avance vers la partie rétrécie du corps.Machine according to claim 1, characterized in that the tool holder has at its front end a body (34) having a wedge-shaped section, this section decreasing from the rear to the front, in which the sliders are mounted jaws (35) made up of two parts comprising V-shaped openings facing each other and having transverse recesses (36) allowing them to be brought together by interpenetration, when they advance towards the narrowed part of the body. Machine selon l'une quelconque des revendications 1 et 2, caractérisée en ce que le berceau support (25) est monté à l'intérieur d'une glissière (24) en forme d'arc de cercle dont le centre est tourné vers le haut, la partie inférieure de ce berceau possédant une forme complémentaire de celle de la glissière, des moyens étant prévus pour assurer l'entraînement en rotation du berceau à l'intérieur de la glissière courbe, et d'autres moyens (27) assurant le blocage dans la position choisie.Machine according to either of Claims 1 and 2, characterized in that the support cradle (25) is mounted inside a slide (24) in the form of an arc of a circle, the center of which faces upwards. , the lower part of this cradle having a shape complementary to that of the slide, means being provided for ensuring the rotational driving of the cradle inside the curved slide, and other means (27) ensuring the blocking in the chosen position. Machine selon la revendication 3, caractérisée en ce que le support (22) du berceau (25) est monté réglable en hauteur vis-à-vis du plateau (15) auquel il est associé.Machine according to claim 3, characterized in that the support (22) of the cradle (25) is mounted adjustable in height with respect to the plate (15) with which it is associated. Machine selon la revendication 4, caractérisée en ce que le support (22) est monté à l'extrémité supérieure d'une colonne verticale (19) réglable axialement par rapport au plateau (15) et traversant le bâti-support (2) de la machine au niveau d'une lumière (14) que comporte celui-ci.Machine according to claim 4, characterized in that the support (22) is mounted at the upper end of a vertical column (19) adjustable axially with respect to the plate (15) and passing through the support frame (2) of the machine at the level of a light (14) which the latter comprises. Machine selon la revendication 5, caractérisée en ce que le support (22) du berceau (25) est monté pivotant sur l'extrémité supérieure de la colonne (19) avec interposition d'un excentrique (23) qui assure, lors de la rotation du support du berceau vis-à-vis du plateau, un mouvement de déplacement en direction de la meule.Machine according to claim 5, characterized in that the support (22) of the cradle (25) is pivotally mounted on the upper end of the column (19) with the interposition of an eccentric (23) which ensures, during rotation of the cradle support with respect to the plate, a movement of movement towards the grinding wheel. Machine selon l'une quelconque des revendications 4 à 6, caractérisée en ce que le plateau (19 est monté pivotant sur le bâti-support (2) autour d'un axe vertical, avec blocage dans la position souhaitée, une lumière (14) en arc de cercle étant prévue pour permettre le passage de la colonne (19) à l'extrémité supérieure de laquelle est montée le support du berceau.Machine according to any one of claims 4 to 6, characterized in that the plate (19 is pivotally mounted on the support frame (2) around a vertical axis, with locking in the desired position, a lumen (14) in an arc being provided to allow the passage of the column (19) at the upper end of which is mounted the support for the cradle. Machine selon l'une quelconque des revendications 1 à 7, caractérisée en ce que la meule (5) et son moteur (3) sont montées sur le bâti-support (2) avec interposition de deux glissières croisées (7,8) associées à des moyens de réglage de leur position par vis et volant d'indexation.Machine according to any one of Claims 1 to 7, characterized in that the grinding wheel (5) and its motor (3) are mounted on the support frame (2) with the interposition of two crossed slides (7,8) associated with means for adjusting their position by screw and indexing wheel.
EP19910420011 1990-01-12 1991-01-11 Machine for sharpening twist drills Withdrawn EP0437412A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9000667A FR2657035B1 (en) 1990-01-12 1990-01-12 MACHINE FOR SHARPENING HELICAL FORESTS.
FR9000667 1990-01-12

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EP0437412A1 true EP0437412A1 (en) 1991-07-17

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2733931A1 (en) * 1995-05-11 1996-11-15 Vancon Noel Sharpener for helical drill or cutter bits etc.
CN102756307A (en) * 2012-07-31 2012-10-31 长城汽车股份有限公司 Method for grinding complex cutting tool and grinding wheel
CN105458932A (en) * 2015-12-30 2016-04-06 苏州钛盟科技精密模具有限公司 Grinding wheel bevel angle trimming jig
CN105563242A (en) * 2016-03-08 2016-05-11 桂林电子科技大学 Full-automatic coping device for twist drill
CN105583630A (en) * 2016-02-23 2016-05-18 安徽省宁国顺昌机械有限公司 Efficient bearing inner ring processing device
CN113787385A (en) * 2021-09-24 2021-12-14 厦门厦芝科技工具有限公司 Passivation machine and using method thereof

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Publication number Priority date Publication date Assignee Title
FR813333A (en) * 1936-02-05 1937-05-31 Advanced drill and sharpening machine
DE720563C (en) * 1932-09-18 1942-05-11 Wesselmann Bohrer Co Ag Machine used for relief grinding the cutting back surfaces of twist drills
DE739722C (en) * 1940-02-16 1943-10-02 Ortlieb & Cie Julius Grinding machine, in particular spiral drill grinding machine
US2369642A (en) * 1942-06-08 1945-02-20 Benning Wilbert Orville Drill sharpener
US2512888A (en) * 1948-05-08 1950-06-27 Henry Hildebrandt Apparatus for grinding drills
FR66604E (en) * 1949-07-27 1957-06-18 Sharpening of drills and the like
DE1111053B (en) * 1958-09-24 1961-07-13 Solid Werk Georg Ehni Device for grinding twist drill tips
GB1184614A (en) * 1966-07-19 1970-03-18 Renault Method of Sharpening Twist Drills, and Machine Therefor.

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE720563C (en) * 1932-09-18 1942-05-11 Wesselmann Bohrer Co Ag Machine used for relief grinding the cutting back surfaces of twist drills
FR813333A (en) * 1936-02-05 1937-05-31 Advanced drill and sharpening machine
DE739722C (en) * 1940-02-16 1943-10-02 Ortlieb & Cie Julius Grinding machine, in particular spiral drill grinding machine
US2369642A (en) * 1942-06-08 1945-02-20 Benning Wilbert Orville Drill sharpener
US2512888A (en) * 1948-05-08 1950-06-27 Henry Hildebrandt Apparatus for grinding drills
FR66604E (en) * 1949-07-27 1957-06-18 Sharpening of drills and the like
DE1111053B (en) * 1958-09-24 1961-07-13 Solid Werk Georg Ehni Device for grinding twist drill tips
GB1184614A (en) * 1966-07-19 1970-03-18 Renault Method of Sharpening Twist Drills, and Machine Therefor.

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2733931A1 (en) * 1995-05-11 1996-11-15 Vancon Noel Sharpener for helical drill or cutter bits etc.
CN102756307A (en) * 2012-07-31 2012-10-31 长城汽车股份有限公司 Method for grinding complex cutting tool and grinding wheel
CN105458932A (en) * 2015-12-30 2016-04-06 苏州钛盟科技精密模具有限公司 Grinding wheel bevel angle trimming jig
CN105583630A (en) * 2016-02-23 2016-05-18 安徽省宁国顺昌机械有限公司 Efficient bearing inner ring processing device
CN105563242A (en) * 2016-03-08 2016-05-11 桂林电子科技大学 Full-automatic coping device for twist drill
CN113787385A (en) * 2021-09-24 2021-12-14 厦门厦芝科技工具有限公司 Passivation machine and using method thereof
CN113787385B (en) * 2021-09-24 2022-12-09 厦门厦芝科技工具有限公司 Passivation machine and using method thereof

Also Published As

Publication number Publication date
FR2657035B1 (en) 1995-01-06
FR2657035A1 (en) 1991-07-19

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