EP0272339B2 - Feed mechanism for an abradant honing tool - Google Patents

Feed mechanism for an abradant honing tool Download PDF

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Publication number
EP0272339B2
EP0272339B2 EP19860117850 EP86117850A EP0272339B2 EP 0272339 B2 EP0272339 B2 EP 0272339B2 EP 19860117850 EP19860117850 EP 19860117850 EP 86117850 A EP86117850 A EP 86117850A EP 0272339 B2 EP0272339 B2 EP 0272339B2
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EP
European Patent Office
Prior art keywords
friction
honing tool
tool according
adjusting
shank
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.)
Expired - Lifetime
Application number
EP19860117850
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German (de)
French (fr)
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EP0272339A1 (en
EP0272339B1 (en
Inventor
Peter Baum
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Maschinenfabrik Gehring GmbH and Co KG
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Maschinenfabrik Gehring GmbH and Co KG
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Application filed by Maschinenfabrik Gehring GmbH and Co KG filed Critical Maschinenfabrik Gehring GmbH and Co KG
Priority to EP19860117850 priority Critical patent/EP0272339B2/en
Priority to ES86117850T priority patent/ES2019581B3/en
Priority to DE8686117850T priority patent/DE3676310D1/en
Publication of EP0272339A1 publication Critical patent/EP0272339A1/en
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Publication of EP0272339B1 publication Critical patent/EP0272339B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B33/00—Honing machines or devices; Accessories therefor
    • B24B33/02—Honing machines or devices; Accessories therefor designed for working internal surfaces of revolution, e.g. of cylindrical or conical shapes

Definitions

  • the invention relates to a honing tool according to the preamble of claim 1, as is known for example from DE-A1 2 908 422.
  • Reaming tools usually have a long service life. Therefore, they do not have to be readjusted very often to compensate for wear. It is therefore customary to also use the mechanical infeed devices with which the reaming tools are manually preset to the bore size to be produced for readjustment when the tool is worn.
  • Such delivery devices can be arranged as setting devices on the tool itself or on an adapter for receiving the tool and enable the friction surfaces to be widened by hand using an adjusting nut.
  • the bore size to be generated is set by initial adjustment by hand, but the adjusting device, which is to be actuated automatically, is provided for readjustment in order to compensate for wear.
  • the actuator of the expanding device consists of a fork-shaped coupling member, which is mounted at the upper end of a connecting rod to the tool shank by means of a roller guide in such a way that when it is axially displaced, the rod and thus the shank is rotated and at the same time axially displaced.
  • the conical shaft part I moves axially in the friction sleeve, which is widened in the process.
  • the transmission path from the adjusting device to the tool shank is very long. It also contains couplings between the actuator, the linkage and the tool shank.
  • very high infeed forces are required, especially in the case of tools of large diameter, which cannot be transmitted without deformation of the connecting linkage in this system and also in general in the case of long infeed paths. Therefore, an exact adjustment of the friction surfaces of a honing tool is of the order of 0.001 mm
  • the invention has for its object to design the generic honing tool so that the infeed device can transmit high feed forces while avoiding elastic deformations and preloads with a structurally simple structure.
  • the arrangement of the adjusting nut forming the actuator on a threaded section of the tool shank enables the actuating forces to be applied directly to the shank by means of an automatically actuated adjusting device which in turn acts directly on the adjusting nut. No linkage is therefore required for the transmission of the delivery forces, which would lead to deformations and thus to inaccuracies in the setting.
  • the adjusting nut moves the friction sleeve on the shaft.
  • the infeed device has a very simple design and, in addition to automatic readjustment, can also be used for the automatic presetting of the reaming tool.
  • 1 has a preferably cylindrical shaft 2, which has a clamping end 3 for attachment to a (not shown) honing machine, an adjoining threaded section 4, and a conically widening shaft part 5.
  • the shaft part 5 carries a known friction sleeve 6, which is provided on its outer circumference with a cutting surface 7, e.g. an electroplated diamond layer.
  • An actuator designed as an adjusting nut 8 is screwed onto the threaded section 4 of the shaft 2 and has a toothing 9 on its outer circumference.
  • the friction sleeve 6 is on the shaft part 5 between a pressure ring 10 and a forehead arranged at a distance from the front end 12 of the shaft 2 disc 13 set in the axial direction.
  • the pressure ring 10 is supported on an end face 11 of the adjusting nut 8.
  • the face plate 13 is aligned with a centering lug 14 concentrically with the friction sleeve 6 and non-positively connected to the shaft 2 via a pull rod 15. It interacts with a spring assembly 16 surrounding it, which is arranged in a blind bore 17 running coaxially in the shaft part 5.
  • the spring assembly is clamped between an end collar 18 of the pull rod 15 and a closure disk 19. It closes the bore 17 and is firmly connected to the shaft 2, preferably screwed.
  • the pull rod 15 which is passed through the closure disk 19 and the end disk 13 has a threaded end section 20 onto which a nut 21 is screwed, which in the assembled position rests against the end face 22 of the end disk 13. With this arrangement, the end plate 13 is pressed under the force of the spring assembly 16 against the annular end face 24 of the friction sleeve 6.
  • the ratios are chosen so that the axially directed machining forces occurring during honing cannot cause any undesired displacement of the friction sleeve on the shaft 2.
  • the adjusting nut 8, the shaft 2 or the shaft part 5 and the pull rod 15 with the spring assembly 16 form an expanding device 1 a for the friction sleeve 6.
  • the adjusting device 25 essentially consists of a toothed rack 26 which can be brought into engagement with the toothing 9 of the adjusting nut 8 by means of a first adjusting cylinder 27 (FIG. 2) via a sliding piece 30 guided in guides 28, 29. In this position, the toothed rack 26 is displaceably guided in a groove-shaped recess 33 with a second adjusting cylinder 31 transversely to the tool axis in a cross piece 32 which is firmly connected to the sliding piece 30.
  • the adjusting cylinder 27 and the guides 28, 29 are mounted in a fixed position on a bracket 34 fixedly attached to the machine stand (not shown).
  • the piston rod 35 of the adjusting cylinder 27 is connected to the sliding piece 30 via two drivers 36 (FIG. 2). They are firmly screwed to the sliding piece 30 and engage with a nose-shaped projection 37 in an annular groove 38 of the piston rod 35.
  • the conditions are such that there is play on all sides between the piston rod 35 and the driver 36 transversely to the axial direction of the piston rod, as a result of which any misalignment between the adjusting cylinder 27 and the sliding piece 30 is harmless.
  • the drivers 36 project in opposite directions over the sliding piece 30.
  • Adjustable stop screws 39 are screwed into the projecting sections, which stop on an adjacent end face 40 of the guides 28 and 29, respectively, when the toothed rack 26 is in engagement with the adjusting nut 8.
  • the adjusting cylinder 31 is mounted transversely to the steady-state cylinder 27 on the cross piece 32 in alignment with the rack 26 in such a way that its center axis lies approximately in the center plane of the rack 26.
  • the piston rod 41 of the adjusting cylinder 31 is connected directly to the rack 26 by means of two drivers 42.
  • the drivers 42 engage with nose-shaped projections 43 in an annular groove 44 on the piston rod 41.
  • the stroke of the adjusting cylinder 31 is preferably chosen so large that it corresponds to a full tooth pitch of the toothing 9. The stroke can also correspond to several full tooth pitches.
  • a fork 45 is attached, which secures the reaming tool against twisting during delivery.
  • two diametrically opposed key surfaces 46 are attached to the reaming tool between the cylindrical clamping end 3 and the threaded section 4, the key width of which corresponds to the opening 47 of the fork 45.
  • a counter-holding device 48 is provided in order to absorb the radially acting force component occurring during the infeed, which would otherwise force the tool away.
  • the counter-holding device 48 essentially consists of a two-armed lever 49 which is pivotably mounted on a support arm 50.
  • the lever 49 has an end 51 opposite the fork 45, which is preferably prismatic.
  • the support arm 50 is (not shown) rigidly connected to the console 34 or the machine stand (not shown).
  • the linkage 52 is adjustable in length in a known manner, e.g. by means of a turnbuckle screw 55, whereby a precise setting of the contact of the lever end 51 at the clamping end 3 is made possible.
  • a second counter-holding device 56 which is large Rem axial distance from the counter-holding device 48, the tool 1 is arranged.
  • a counter piece 58 is fastened to the lower free end of the tool 1 on a device plate 57 fixed on the machine side.
  • the adjusting cylinder 27 Before the start of an adjustment cycle, the adjusting cylinder 27 is in the retracted state (not shown), and the adjusting device 25 is at a greater radial distance from the machining axis of the reaming tool 1.
  • the lever 49 of the holding device 48 is located due to its articulated connection to the adjusting device 25 via the linkage 52, the turnbuckle screw 55 and the bearing block 54 in a pivoted-out position (not shown). The conditions are always such that all parts are outside an interference circle of the honing machine.
  • the readjustment cycle is triggered by a signal from a manual or preferably automatic metering device known per se and therefore not shown.
  • the reaming tool 1 moves in the axial direction into a predetermined position. In this position, the tool is located completely outside the workpiece, and the toothing 9 of the adjusting nut 8 is approximately at the level of the rack 26.
  • a positioning drive which is known per se and therefore also not shown, then rotates the reaming tool into a predetermined angular position, which is selected in this way that the key surfaces 46 on the shaft 2 are aligned with the opening 47 of the fork 45.
  • the adjusting cylinder 27 is then subjected to low pressure, whereupon the piston rod 35 extends and the adjusting device 25 moves radially in the direction of the reaming tool 1.
  • the fork opening 47 receives the shaft 2 on its key surfaces 46 and the toothed rack 26 comes into meshing engagement with the toothing 9 of the adjusting nut 8.
  • the movement of the adjusting device 25 is limited by the stop screws 39, which are set such that the toothed rack 26 meshes with the adjusting nut 8 with little play.
  • This position is detected by a control device (not shown), which then increases the pressure in the adjusting cylinder 27.
  • the second adjusting cylinder 31 is subjected to high pressure. He then shifts the rack 26 by, for example, one tooth pitch.
  • the adjusting nut 8 which is in engagement with the toothed rack 26 is accordingly rotated by a small angle. It causes an expansion of the friction sleeve 6 by a certain amount, e.g. 0.001 mm in diameter.
  • the honing tool 1 is secured against rotation by the fork 45 and held in position by the counter-holding devices 48, 56 with respect to the predetermined machining axis.
  • the adjusting cylinder 27 and then the adjusting cylinder 31 move back to their starting position, the readjustment cycle is completed and the reaming tool is released for the next work operation.
  • the stroke of the adjusting cylinder 31 preferably corresponds to one or more full tooth pitches, which ensures in a simple manner that the toothing of the toothed rack 26 and adjusting nut 8 gap on tooth with each further adjustment. If tooth is on tooth in the worst case during the first readjustment, the rack 26 is first automatically moved by means of the adjusting cylinder 31 until the desired engagement position is reached. Only then is the pressure in the adjusting cylinder 27 increased and the actual readjustment carried out in the manner described. The initially low pressure in the adjusting cylinder 27 rules out damage between the toothed rack 26 and the adjusting nut 8.

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

Description

Die Erfindung betrifft ein Reibhonwerkzeug nach dem Oberbegriff des Patentanspruches 1, wie es beispielsweise aus der DE-A1 2 908 422 bekannt ist.The invention relates to a honing tool according to the preamble of claim 1, as is known for example from DE-A1 2 908 422.

Reibhonwerkzeuge haben in der Regel eine hohe Standzeit. Sie müssen darum nicht sehr häufig zwecks Kompensation des Verschleißes nachgestellt werden. Es ist daher üblich, die mechanischen Zustellvorrichtungen, mit denen Reibhonwerkzeuge manuell auf das zu erzeugende Bohrungsmaß voreingestellt werden, auch zum Nachstellen bei Verschleiß des Werkzeuges zu verwenden. Solche Zustellvorrichtungen können als Einstellvorrichtungen am Werkzeug selbst oder an einem Adapter für die Aufnahme des Werkzeuges angeordnet sein und ermöglichen die Aufweitung der Reibflächen von Hand mittels einer Einstellmutter.Reaming tools usually have a long service life. Therefore, they do not have to be readjusted very often to compensate for wear. It is therefore customary to also use the mechanical infeed devices with which the reaming tools are manually preset to the bore size to be produced for readjustment when the tool is worn. Such delivery devices can be arranged as setting devices on the tool itself or on an adapter for receiving the tool and enable the friction surfaces to be widened by hand using an adjusting nut.

Für bestimmte Einsatzzwecke ist es aber erwünscht, die Reibflächen zur Verschleißkompensation automatisch nachzustellen. Es wurde schon vorgeschlagen, hierfür die Zustellsysteme zu verwenden, mit denen die Honsteine oder Honleisten von üblichen Honwerkzeugen automatisch radial verstellt werden, um sie im Eilgang in Arbeitseingriff zu bringen und während des Zerspanens kontinuierlich oder schrittweise in Abhängigkeit vom Materialabtrag zuzustellen. Ein solches Zustellsystem ist beispielsweise aus der DE-A1 2 619 741 bekannt. Diese Einrichtungen sind entsprechend den an sie gestellten Anforderungen aufwendig aufgebaut und für die einfache Voreinstellung und Nachstellung von Reibhonwerkzeugen wenig geeignet. Außerdem sind die bekannten automatischen Zustelleinrichtungen so konstruiert, daß bis zum Honwerkzeug relativ große Wege zu überbrücken sind und infolge elastischer Deformation hohe Vorspannungen auftreten.For certain purposes, however, it is desirable to automatically adjust the friction surfaces for wear compensation. It has already been proposed to use the infeed systems for this, with which the honing stones or honing stones of conventional honing tools are automatically adjusted radially, in order to bring them into rapid engagement at work and to be fed in continuously or step-wise during machining, depending on the material removal. Such a delivery system is known for example from DE-A1 2 619 741. These devices are complex in accordance with the requirements placed on them and are not very suitable for the simple presetting and adjustment of friction honing tools. In addition, the known automatic delivery devices are designed so that relatively large distances have to be bridged to the honing tool and high prestresses occur as a result of elastic deformation.

Bei dem gattungsgemäßen Reibhonwerkzeug (DE-A1-2 908 422) wird das zu erzeugende Bohrungsmaß durch anfängliche Justierung von Hand eingestellt, jedoch ist zum Nachstellen zwecks Kompensation des Verschleißes die automatisch zu betätigende Verstelleinrichtung vorgesehen. Das Stellglied der Aufweitvorrichtung besteht aus einem gabelförmigen Kupplungsglied, das am oberen Ende eines Verbindungsgestänges zum Werkzeugschaft mittels einer Rollenführung derart gelagert ist, daß bei seiner Axialverschiebung das Gestänge und damitderSchaftverdrehtund zugleich axial verschoben wird. Dadurch verschiebt sich der konische Schafttei I axial in der Reibhülse, die dabei aufgeweitet wird. Auch bei dieser Konstruktion ist der Übertragungsweg von der Stellvorrichtung bis zum Werkzeugschaft sehr lang. Er enthält überdies Kupplungen zwischen dem Stellglied, dem Verbindungsgestänge und dem Werkzeugschaft. Für die Aufweitung der Reibhülse eines Reibhonwerkzeuges sind aber, insbesondere bei Werkzeugen großen Durchmessers, sehr hohe Zustellkräfte erforderlich, die bei diesem System und auch allgemein bei langen Zustellwegen nicht ohne Deformation der Verbindungsgestänge zu übertragen sind. Daher ist eine genaue Nachstellung der Reibflächen eines Reibhonwerkzeuges in der Größenordnung von 0,001 mmIn the generic honing tool (DE-A1-2 908 422), the bore size to be generated is set by initial adjustment by hand, but the adjusting device, which is to be actuated automatically, is provided for readjustment in order to compensate for wear. The actuator of the expanding device consists of a fork-shaped coupling member, which is mounted at the upper end of a connecting rod to the tool shank by means of a roller guide in such a way that when it is axially displaced, the rod and thus the shank is rotated and at the same time axially displaced. As a result, the conical shaft part I moves axially in the friction sleeve, which is widened in the process. With this construction too, the transmission path from the adjusting device to the tool shank is very long. It also contains couplings between the actuator, the linkage and the tool shank. For widening the friction sleeve of a reaming tool, however, very high infeed forces are required, especially in the case of tools of large diameter, which cannot be transmitted without deformation of the connecting linkage in this system and also in general in the case of long infeed paths. Therefore, an exact adjustment of the friction surfaces of a honing tool is of the order of 0.001 mm

und weniger mit den bekannten Systemen nicht möglich, insbesondere dann nicht, wenn die Nachstellung nach einer Zeitspanne von mehreren Stunden bis Tagen erforderlich wird.and less not possible with the known systems, especially not if the readjustment becomes necessary after a period of several hours to days.

Der Erfindung liegt die Aufgabe zugrunde, das gattungsgemäße Reibhonwerkzeug so auszubilden, daß die Zustelleinrichtung bei konstruktiv einfachem Aufbau hohe Zustellkräfte unter Vermeidung von elastischen Verformungen und Vorspannungen übertragen kann.The invention has for its object to design the generic honing tool so that the infeed device can transmit high feed forces while avoiding elastic deformations and preloads with a structurally simple structure.

Die Aufgabe wird gemäß der Erfindung mit den kennzeichnenden Merkmalen des Patentanspruches 1 gelöst.The object is achieved according to the invention with the characterizing features of claim 1.

Die Anordnung der das Stellglied bildenden Einstellmutter auf einem Gewindeabschnitt des Werkzeugschaftes ermöglicht den Angriff der Stellkräfte direkt an dem Schaft mittels einer automatisch zu betätigenden Verstellvorrichtung, die ihrerseits direkt auf die Einstellmutter wirkt. Für die Übertragung der Zustellkräfte sind daher keine Gestänge erforderlich, die zu Deformationen und damit zu Ungenauigkeiten der Einstellung führen würden. Die Einstellmutter verschiebt die Reibhülse auf dem Schaft. Die Zustelleinrichtung ist konstruktiv sehr einfach aufgebaut und kann außerzum automatischen Nachstellen auch zur automatischen Voreinstellung des Reibhonwerkzeuges verwendet werden.The arrangement of the adjusting nut forming the actuator on a threaded section of the tool shank enables the actuating forces to be applied directly to the shank by means of an automatically actuated adjusting device which in turn acts directly on the adjusting nut. No linkage is therefore required for the transmission of the delivery forces, which would lead to deformations and thus to inaccuracies in the setting. The adjusting nut moves the friction sleeve on the shaft. The infeed device has a very simple design and, in addition to automatic readjustment, can also be used for the automatic presetting of the reaming tool.

Weitere Merkmale der Erfindung ergeben sich aus den weiteren Ansprüchen, der nachfolgenden Beschreibung und den Zeichnungen. Es zeigt:

  • Fig. imAxialschnitteineerfindungsgemäßeZustelleinrichtung mit einem Reibhonwerkzeug in schematischer Darstellung,
  • Fig. 2 eine Draufsicht der Zustelleinrichtung nach
  • Fig. 1 in schematischer Darstellung.
Further features of the invention result from the further claims, the following description and the drawings. It shows:
  • Fig. In the axial section of an inventive delivery device with a honing tool in a schematic representation,
  • Fig. 2 is a plan view of the delivery device according to
  • Fig. 1 in a schematic representation.

Das Reibhonwerkzeug 1 nach Fig. 1 hat einen vorzugsweise zylindrischen Schaft 2, der ein Einspannende 3 für die Befestigung an einer (nicht dargestellten) Honmaschine, einen sich daran anschließenden Gewindeabschnitt 4, sowie ein sich konisch erweiterndes Schaftteil 5 aufweist.1 has a preferably cylindrical shaft 2, which has a clamping end 3 for attachment to a (not shown) honing machine, an adjoining threaded section 4, and a conically widening shaft part 5.

Das Schaftteil 5 trägt eine an sich bekannte Reibhülse 6, die an ihrem Außenumfang mit einem Schneidbelag 7, z.B. einer galvanisch aufgebrachten Diamantschicht, versehen ist. Auf den Gewindeabschnitt 4 des Schaftes 2 ist ein als Einstellmutter 8 ausgebildetes Stellglied geschraubt, das an seinem äußeren Umfang eine Verzahnung 9 trägt.The shaft part 5 carries a known friction sleeve 6, which is provided on its outer circumference with a cutting surface 7, e.g. an electroplated diamond layer. An actuator designed as an adjusting nut 8 is screwed onto the threaded section 4 of the shaft 2 and has a toothing 9 on its outer circumference.

Die Reibhülse 6 ist auf dem Schaftteil 5 zwischen einem Druckring 10 und einer mit Abstand vom stirnseitigen Ende 12 des Schaftes 2 angeordneten Stirnscheibe 13 in axialer Richtung festgelegt. Der Druckring 10 stützt sich an einer Stirnseite 11 der Einstellmutter 8 ab. Die Stirnscheibe 13 ist mit einem Zentrieransatz 14 konzentrisch zur Reibhülse 6 ausgerichtet und mit dem Schaft 2 über eine Zugstange 15 kraftschlüssig verbunden. Sie wirkt mit einem sie umgebenden Federpaket 16 zusammen, das in einer koaxial im Schaftteil 5 verlaufenden Sacklochbohrung 17 angeordnet ist. Das Federpaket ist zwischen einem Endbund 18 der Zugstange 15 und einer Verschlußscheibe 19 eingespannt. Sie verschließt die Bohrung 17 und ist fest mit dem Schaft 2 verbunden, vorzugsweise verschraubt. Die durch die Verschlußscheibe 19 und die Stirnscheibe 13 hindurchgeführte Zugstange 15 hat einen mit Gewinde versehenen Endabschnitt 20, auf den eine Mutter 21 geschraubt ist, die in montierter Lage an der Stirnfläche 22 der Stirnscheibe 13 anliegt. Durch diese Anordnung wird die Stirnscheibe 13 unter der Kraft des Federpaketes 16 gegen die ringförmige Stirnfläche 24 der Reibhülse 6 gedrückt.The friction sleeve 6 is on the shaft part 5 between a pressure ring 10 and a forehead arranged at a distance from the front end 12 of the shaft 2 disc 13 set in the axial direction. The pressure ring 10 is supported on an end face 11 of the adjusting nut 8. The face plate 13 is aligned with a centering lug 14 concentrically with the friction sleeve 6 and non-positively connected to the shaft 2 via a pull rod 15. It interacts with a spring assembly 16 surrounding it, which is arranged in a blind bore 17 running coaxially in the shaft part 5. The spring assembly is clamped between an end collar 18 of the pull rod 15 and a closure disk 19. It closes the bore 17 and is firmly connected to the shaft 2, preferably screwed. The pull rod 15 which is passed through the closure disk 19 and the end disk 13 has a threaded end section 20 onto which a nut 21 is screwed, which in the assembled position rests against the end face 22 of the end disk 13. With this arrangement, the end plate 13 is pressed under the force of the spring assembly 16 against the annular end face 24 of the friction sleeve 6.

Die Verhältnisse sind dabei so gewählt, daß die beim Reibhonen auftretenden axial gerichteten Bearbeitungskräfte keine unerwünschte Verschiebung der Reibhülse auf dem Schaft 2 bewirken können. Die Einstellmutter 8, der Schaft 2 bzw. der Schaftteil 5 und die Zugstange 15 mit dem Federpaket 16 bilden eine Aufweitvorrichtung 1 a für die Reibhülse 6.The ratios are chosen so that the axially directed machining forces occurring during honing cannot cause any undesired displacement of the friction sleeve on the shaft 2. The adjusting nut 8, the shaft 2 or the shaft part 5 and the pull rod 15 with the spring assembly 16 form an expanding device 1 a for the friction sleeve 6.

Bei einer Drehung der Einstellmutter 8 in Richtung der Gewindesteigung wird jedoch die Reibhülse 6 unter Überwindung der Federkraft in axialer Richtung auf dem sich konisch erweiternden Schaftteil 5 verschoben. Die in bekannterweise geschlitzt ausgeführte Reibhülse 6 wird dadurch radial in gleichem Maße über ihre gesamte Länge erweitert. Die gesteuerte Drehung der Einstellmutter 8 zum Zwecke der Einstellung und Nachstellung des Reibhonwerkzeuges auf ein bestimmtes Maß erfolgt durch eine automatisch arbeitende, mechanische Verstelleinrichtung 25.When the adjusting nut 8 is rotated in the direction of the thread pitch, the friction sleeve 6 is displaced in the axial direction on the conically widening shaft part 5 while overcoming the spring force. The friction sleeve 6, which is known to be slotted, is thereby radially expanded to the same extent over its entire length. The controlled rotation of the adjusting nut 8 for the purpose of adjusting and readjusting the reaming tool to a certain dimension is carried out by an automatically operating, mechanical adjusting device 25.

Die Verstelleinrichtung 25 besteht im wesentlichen aus einer Zahnstange 26, die mit einem ersten Verstellzylinder 27 (Fig. 2) über ein in Führungen 28, 29 geführtes Schiebestück 30 in Eingriff mit der Verzahnung 9 der Einstellmutter 8 bringbar ist. Die Zahnstange 26 ist in dieser Stellung mit einem zweiten Verstellzylinder 31 quer zur Werkzeugachse in einem mit dem Schiebestück 30 festverbundenen Querstück 32 in einer nutförmigen Ausnehmung 33 verschiebbar geführt.The adjusting device 25 essentially consists of a toothed rack 26 which can be brought into engagement with the toothing 9 of the adjusting nut 8 by means of a first adjusting cylinder 27 (FIG. 2) via a sliding piece 30 guided in guides 28, 29. In this position, the toothed rack 26 is displaceably guided in a groove-shaped recess 33 with a second adjusting cylinder 31 transversely to the tool axis in a cross piece 32 which is firmly connected to the sliding piece 30.

Der Verstellzylinder 27 und die Führungen 28, 29 sind ortsfest an einer fest am Maschinenständer (nicht gezeigt) angebrachten Konsole 34 montiert. Die Kolbenstange 35 des Verstellzylinders 27 ist mit dem Schiebestück 30 über zwei Mitnehmer 36 verbunden (Fig. 2). Sie sind mit dem Schiebestück 30 fest verschraubt und greifen mit einem nasenförmigen Vorsprung 37 in eine Ringnut 38 der Kolbenstange 35 ein. Dabei sind die Verhältnisse so getroffen, daß zwischen Kolbenstange 35 und Mitnehmer 36 quer zur Achsrichtung der Kolbenstange allseitig Spiel gegeben ist, wodurch eventuelle Fluchtungsfehler zwischen dem Verstellzylinder 27 und dem Schiebestück 30 unschädlich sind. Die Mitnehmer 36 stehen in entgegengesetzte Richtungen über das Schiebestück 30 vor. In die überstehenden Abschnitte sind verstellbare Anschlagschrauben 39 geschraubt, die an einer benachbarten Stirnseite 40 der Führungen 28 bzw. 29 anschlagen, wenn die Zahnstange 26 mit der Einstellmutter 8 im Eingriff ist.The adjusting cylinder 27 and the guides 28, 29 are mounted in a fixed position on a bracket 34 fixedly attached to the machine stand (not shown). The piston rod 35 of the adjusting cylinder 27 is connected to the sliding piece 30 via two drivers 36 (FIG. 2). They are firmly screwed to the sliding piece 30 and engage with a nose-shaped projection 37 in an annular groove 38 of the piston rod 35. The conditions are such that there is play on all sides between the piston rod 35 and the driver 36 transversely to the axial direction of the piston rod, as a result of which any misalignment between the adjusting cylinder 27 and the sliding piece 30 is harmless. The drivers 36 project in opposite directions over the sliding piece 30. Adjustable stop screws 39 are screwed into the projecting sections, which stop on an adjacent end face 40 of the guides 28 and 29, respectively, when the toothed rack 26 is in engagement with the adjusting nut 8.

DerVerstellzylinder31 ist quer zum Verstettzytinder 27 am Querstück 32 fluchtend zur Zahnstange 26 so montiert, daß seine Mittenachse etwa in der Mittenebene der Zahnstange 26 liegt. Die Kolbenstange 41 des Verstellzylinders 31 ist mittels zweier Mitnehmer 42 direkt mit der Zahnstange 26 verbunden. Die Mitnehmer 42 greifen mit nasenförmigen Vorsprüngen 43 in eine Ringnut44 an der Kolbenstange 41 ein. Der Hub des Verstellzylinders 31 ist vorzugsweise so groß gewählt, daß er einer vollen Zahnteilung der Verzahnung 9 entspricht. Der Hub kann aber auch mehreren vollen Zahnteilungen entsprechen.The adjusting cylinder 31 is mounted transversely to the steady-state cylinder 27 on the cross piece 32 in alignment with the rack 26 in such a way that its center axis lies approximately in the center plane of the rack 26. The piston rod 41 of the adjusting cylinder 31 is connected directly to the rack 26 by means of two drivers 42. The drivers 42 engage with nose-shaped projections 43 in an annular groove 44 on the piston rod 41. The stroke of the adjusting cylinder 31 is preferably chosen so large that it corresponds to a full tooth pitch of the toothing 9. The stroke can also correspond to several full tooth pitches.

Auf der Oberseite des Querstückes 32 ist eine Gabel 45 befestigt, die das Reibhonwerkzeug während der Zustellung gegen Verdrehen sichert. Hierzu sind am Reibhonwerkzeug zwischen dem zylindrischen Einspannende 3 und dem Gewindeabschnitt 4 zwei diametral einander gegenüberliegende Schlüsselflächen 46 angebracht, deren Schlüsselweite der Öffnung 47 der Gabel 45 entspricht.On the top of the crosspiece 32, a fork 45 is attached, which secures the reaming tool against twisting during delivery. For this purpose, two diametrically opposed key surfaces 46 are attached to the reaming tool between the cylindrical clamping end 3 and the threaded section 4, the key width of which corresponds to the opening 47 of the fork 45.

Ferner ist eine Gegenhalteeinrichtung 48 vorgesehen, um die bei der Zustellung auftretende radial wirkende Kraftkomponente aufzunehmen, die sonst das Werkzeug abdrängen würde.Furthermore, a counter-holding device 48 is provided in order to absorb the radially acting force component occurring during the infeed, which would otherwise force the tool away.

Die Gegenhalteeinrichtung 48 besteht im wesentlichen aus einem zweiarmigen Hebel 49, der schwenkbar an einem Tragarm 50 gelagert ist. Der Hebel 49 weist ein der Gabel 45 gegenüberliegendes Ende 51 auf, das vorzugsweise prismatisch ausgebildet ist. Der Tragarm 50 ist (in nicht gezeigter Weise) starr mit der Konsole 34 bzw. dem (nicht dargestellten) Maschinenständer verbunden.The counter-holding device 48 essentially consists of a two-armed lever 49 which is pivotably mounted on a support arm 50. The lever 49 has an end 51 opposite the fork 45, which is preferably prismatic. The support arm 50 is (not shown) rigidly connected to the console 34 or the machine stand (not shown).

In der während des Zustellvorganges eingenommenen Schwenkstellung (Fig. 2) liegt das Hebelende 51 am Schaft 2 des Werkzeuges 1 an. In dieser Stellung wird der Hebel 49 durch ein Gestänge 52 gehalten, welches das andere Ende 53 des Hebels 49 mit einem fest am Gehäuse des Verstellzylinders 31 angeordneten Lagerbock 54 gelenkig verbindet.In the swivel position assumed during the delivery process (FIG. 2), the lever end 51 bears against the shaft 2 of the tool 1. In this position, the lever 49 is held by a linkage 52 which connects the other end 53 of the lever 49 to a bearing block 54 which is fixedly arranged on the housing of the adjusting cylinder 31.

Das Gestänge 52 ist in bekannter Weise längenverstellbar ausgebildet, z.B. mittels einer Spannschloßschraube 55, wodurch ein genaues Einstellen der Anlage des Hebelendes 51 am Einspannende 3 ermöglicht wird.The linkage 52 is adjustable in length in a known manner, e.g. by means of a turnbuckle screw 55, whereby a precise setting of the contact of the lever end 51 at the clamping end 3 is made possible.

Insbesondere beim Auftreten sehr großer Verstellkräfte kann es vorteilhaft sein, eine zweite Gegenhalteeinrichtung 56 vorzusehen, die mit größerem axialen Abstand von der Gegenhalteeinrichtung 48 dem Werkzeug 1 angeordnet ist. Wie Fig. 1 zeigt, ist hierzu am unteren freien Ende des Werkzeuges 1 auf einer maschinenseitig festen Vorrichtungsplatte 57 ein Gegenhaltestück 58 befestigt.In particular when very large adjustment forces occur, it can be advantageous to provide a second counter-holding device 56 which is large Rem axial distance from the counter-holding device 48, the tool 1 is arranged. As shown in FIG. 1, a counter piece 58 is fastened to the lower free end of the tool 1 on a device plate 57 fixed on the machine side.

Nachstehend soll die Arbeitsweise der in Fig. 1 und 2 dargestellten Zustelleinrichtung anhand eines Nachstellvorganges erläutert werden:The mode of operation of the delivery device shown in FIGS. 1 and 2 will be explained below using an adjustment process:

Vor Beginn eines Nachstellzyklusses befindet sich der Verstellzylinder 27 in eingefahrenem Zustand (nicht gezeigt), und die Verstelleinrichtung 25 steht in einem größeren radialen Abstand zur Bearbeitungsachse des Reibhonwerkzeuges 1. Gleichzeitig befindet sich der Hebel 49 der Gegenhalteeinrichtung 48 infolge seiner gelenkigen Verbindung mit der Verstelleinrichtung 25 über das Gestänge 52, die Spannschloßschraube 55 und den Lagerbock 54 in einer ausgeschwenkten Stellung (nicht dargestellt). Die Verhältnisse sind stets so getroffen, daß alle Teile außerhalb eines Störkreises der Honmaschine liegen.Before the start of an adjustment cycle, the adjusting cylinder 27 is in the retracted state (not shown), and the adjusting device 25 is at a greater radial distance from the machining axis of the reaming tool 1. At the same time, the lever 49 of the holding device 48 is located due to its articulated connection to the adjusting device 25 via the linkage 52, the turnbuckle screw 55 and the bearing block 54 in a pivoted-out position (not shown). The conditions are always such that all parts are outside an interference circle of the honing machine.

Der Nachstellzyklus wird durch ein Signal einer manuellen oder vorzugsweise automatischen, an sich bekannten und daher nicht gezeigten Nachmeßeinrichtung ausgelöst. Das Reibhonwerkzeug 1 fährt in Achsrichtung in eine vorbestimmte Position. In dieser Position befindet sich das Werkzeug vollständig außerhalb des Werkstückes,und die Verzahnung 9 der Einstellmutter 8 steht etwa in Höhe der Zahnstange 26. Ein an sich bekannter und daher ebenfalls nicht gezeigter Positionierantrieb dreht das Reibhonwerkzeug dann in eine vorbestimmte Winkelstellung, die so gewählt ist, daß die Schlüsselflächen 46 am Schaft 2 fluchtend zur Öffnung 47 der Gabel 45 stehen.The readjustment cycle is triggered by a signal from a manual or preferably automatic metering device known per se and therefore not shown. The reaming tool 1 moves in the axial direction into a predetermined position. In this position, the tool is located completely outside the workpiece, and the toothing 9 of the adjusting nut 8 is approximately at the level of the rack 26. A positioning drive, which is known per se and therefore also not shown, then rotates the reaming tool into a predetermined angular position, which is selected in this way that the key surfaces 46 on the shaft 2 are aligned with the opening 47 of the fork 45.

Anschließend wird der Verstellzylinder 27 mit Niederdruck beaufschlagt, worauf die Kolbenstange 35 ausfährt und die Verstelleinrichtung 25 radial in Richtung auf das Reibhonwerkzeug 1 vorbewegt. Im Zuge dieser Bewegung nimmt die Gabelöffnung 47 den Schaft 2 an seinen Schlüsselflächen 46 auf und die Zahnstange 26 kommt in Zahneingriff mit der Verzahnung 9 der Einstellmutter 8.The adjusting cylinder 27 is then subjected to low pressure, whereupon the piston rod 35 extends and the adjusting device 25 moves radially in the direction of the reaming tool 1. In the course of this movement, the fork opening 47 receives the shaft 2 on its key surfaces 46 and the toothed rack 26 comes into meshing engagement with the toothing 9 of the adjusting nut 8.

Gleichzeitig wird der Hebel 49 der Gegenhalteeinrichtung 48 über das Gestänge 52 so weit eingeschwenkt, daß sein Hebelende 51 am Einspannende 3 zur Anlage kommt.At the same time, the lever 49 of the counter-holding device 48 is pivoted in so far via the linkage 52 that its lever end 51 comes to rest on the clamping end 3.

Die Bewegung derVerstelleinrichtung 25 ist beim gezeigten Ausführungsbeispiel (Fig. 2) durch die Anschlagschrauben 39 begrenzt, die so eingestellt sind, daß die Zahnstange 26 mit geringem Spiel im Zahneingriff mit der Einstellmutter 8 steht. Diese Stellung wird von einer (nicht gezeigten) Steuereinrichtung erfaßt, die dann den Druck im Verstellzylinder 27 erhöht. Sofort anschließend wird der zweite Verstellzylinder 31 mit Hochdruck beaufschlagt. Er verschiebt dann die Zahnstange 26 um beispielsweise eine Zahnteilung. Die mit der Zahnstange 26 in Eingriff stehende Einstellmutter 8 wird entsprechend um einen kleinen Winkel verdreht. Sie bewirkt über die beschriebene Aufweitvorrichtung 1a bzw. deren Aufweitmechanismus am Werkzeug eine Aufweitung der Reibhülse 6 um einen bestimmten Betrag, z.B. 0,001 mm im Durchmesser. Während dieses Zustellvorganges ist das Reibhonwerkzeug 1 durch die Gabel 45 gegen Verdrehen gesichert und von den Gegenhalteeinrichtungen 48, 56 in seiner Lage in bezug auf die vorgegebene Bearbeitungsachse gehalten. Nach beendeter Zustellung fahren zunächst der Verstellzylinder 27 und danach der Verstellzylinder 31 in seine Ausgangslage zurück, der Nachstellzyklus ist abgeschlossen und das Reibhonwerkzeug ist freigegeben für den nächsten Arbeitseinsatz.In the exemplary embodiment shown (FIG. 2), the movement of the adjusting device 25 is limited by the stop screws 39, which are set such that the toothed rack 26 meshes with the adjusting nut 8 with little play. This position is detected by a control device (not shown), which then increases the pressure in the adjusting cylinder 27. Immediately afterwards, the second adjusting cylinder 31 is subjected to high pressure. He then shifts the rack 26 by, for example, one tooth pitch. The adjusting nut 8 which is in engagement with the toothed rack 26 is accordingly rotated by a small angle. It causes an expansion of the friction sleeve 6 by a certain amount, e.g. 0.001 mm in diameter. During this infeed process, the honing tool 1 is secured against rotation by the fork 45 and held in position by the counter-holding devices 48, 56 with respect to the predetermined machining axis. After the infeed has ended, the adjusting cylinder 27 and then the adjusting cylinder 31 move back to their starting position, the readjustment cycle is completed and the reaming tool is released for the next work operation.

Der Hub des Verstellzylinders 31 entspricht vorzugsweise einer oder mehreren vollen Zahnteilungen, wodurch in einfacher Weise gewährleistet ist, daß bei jeder weiteren Nachstellung die Verzahnung von Zahnstange 26 und Einstellmutter 8 Lücke auf Zahn stehen. Sollte bei der ersten Nachstellung im ungünstigsten Fall Zahn auf Zahn stehen, so erfolgt zuerst automatisch ein Verschieben der Zahnstange 26 mittels des Verstellzylinders 31 bis die gewünschte Eingriffsstellung erreicht ist. Erst danach wird der Druck im Verstellzylinder 27 erhöht und die eigentliche Nachstellung in der beschriebenen Weise vorgenommen. Der anfänglich niedere Druck i m Verstellzylinder 27 schließt Beschädigungen zwischen Zahnstange 26 und Einstellmutter 8 aus.The stroke of the adjusting cylinder 31 preferably corresponds to one or more full tooth pitches, which ensures in a simple manner that the toothing of the toothed rack 26 and adjusting nut 8 gap on tooth with each further adjustment. If tooth is on tooth in the worst case during the first readjustment, the rack 26 is first automatically moved by means of the adjusting cylinder 31 until the desired engagement position is reached. Only then is the pressure in the adjusting cylinder 27 increased and the actual readjustment carried out in the manner described. The initially low pressure in the adjusting cylinder 27 rules out damage between the toothed rack 26 and the adjusting nut 8.

Selbstverständlich ist es auch möglich,durch entsprechende an sich bekannte Steuersysteme, z.B. mittels eines Weggebers am Zylinder 31 den Zahneingriff zwischen Zahnstange 26 und Einstellmutter 8 gesteuert vorzunehmen und auch Bruchteile einer Zahnteilung zuzustellen, beispielsweise dann,wenn besonders kleine Nachstellschritte erwünscht sind.Of course, it is also possible to use appropriate control systems known per se, e.g. to carry out the tooth engagement between the rack 26 and the adjusting nut 8 in a controlled manner by means of a displacement sensor on the cylinder 31 and also to deliver fractions of a tooth pitch, for example when particularly small readjustment steps are desired.

Claims (15)

1. Friction honing tool (1) with a shank (2), which comprises a conical shank part (5), which supports a friction sleeve (6), and with a feed device serving for adjusting the friction surfaces to a certain diameter, to which an expanding device (1a) containing the conical shank part (5) belongs, which device (1a) comprises a control member (8), which can be actuated automatically by an adjusting device (25) located outside the friction honing tool (1), the conical shank part (5) and the friction sleeve (6) being able to be adjusted axially relative to each other, characterised in that the shank (2) comprises a threaded section (4) and that the control member is an adjustment nut (8), which is located on the threaded section (4) and upon rotation in the direction of the thread pitch displaces the friction sleeve (6) in the axial direction on the conical shank part (5), and that the friction sleeve is held between the adjusting nut (8) and an end disc (13), which is connected to the shank (2) with elasticity in tension.
2. Friction honing tool according to Claim 1, characterised in that the adjusting nut (8) comprises external toothing (9), which can be brought into engagement with a toothed rack (26) of the adjusting device (25).
3. Friction honing tool according to Claim 1 or 2, characterised in that the end disc (13) is frictionally connected to the shank (2) by way of a tie-rod (15).
4. Friction honing tool according to Claim 3, characterised in that the tie-rod (15) is retained on the shank (2) by means of a spring (16) preferably constructed as a set of springs, which is supported on an end flange (18) of the tie-rod (15) located within the friction sleeve (6) and on a closure disc (19) closing off the opposite end (6a) of the friction sleeve (6).
5. Friction honing tool according to Claim 4, characterised in that the force of the spring (16) is greater than the machining forces directed axially and acting on the friction sleeve (6).
6. Friction honing tool according to Claim 4 or 5, characterised in that the friction sleeve (6) is able to slide on the conical shank part (5) against the force of the spring (16).
7. Friction honing tool according to one of Claims 2 to 6, characterised in that the toothed rack (26) of the adjusting device (25) can be brought into engagement with the external toothing (9) of the adjusting nut (8) by means of an adjusting cylinder (27), preferably by way of a sliding member (30) guided in guides (28, 29).
8. Friction honing tool according to one of Claims 2 to 7, characterised in that the toothed rack (26) is able to slide transversely to the tool axis by means of an adjusting cylinder (31).
9. Friction honing tool according to Claim 8, characterised in that the stroke of the adjusting cylinder (31) corresponds to at least one full spacing of the toothing (9).
10. Friction honing tool according to one of Claims 1 to 9, characterised in that during the feed, the friction honing tool (1) is prevented from rotating by means of a fork (45).
11. Friction honing tool according to one of Claims 1 to 10, characterised in that at least one counter-retaining device (48; 56) is provided for receiving the components of force acting radially and occurring at the time of the feed.
12. Friction honing tool according to Claim 11, characterised in that the counter-retaining device consists of a two-armed lever (49), which is mounted to tilt on a support arm (50) and whereof one lever end (51) bears against the cylindrical clamping end (3) of the shank (2).
13. Friction honing tool according to Claims 8 and 12, characterised in that the lever (49) is flexibly connected by way of a linkage (52) to a housing of the adjusting cylinder (31) provided for the transverse displacement of the toothed rack (26).
14. Friction honing tool according to one of Claims 1 to 13, characterised in that two counter-retaining devices (48; 56) are provided, which bear against the friction honing tool (1) with an axial spacing one from the other.
15. Friction honing tool according to one of Claims 1 to 14, characterised in that the adjusting device (25) can be controlled automatically by a verifying device known per se and/or manually.
EP19860117850 1986-12-20 1986-12-20 Feed mechanism for an abradant honing tool Expired - Lifetime EP0272339B2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP19860117850 EP0272339B2 (en) 1986-12-20 1986-12-20 Feed mechanism for an abradant honing tool
ES86117850T ES2019581B3 (en) 1986-12-20 1986-12-20 ADJUSTMENT DEVICE FOR A RUBBER BURNING TOOL.
DE8686117850T DE3676310D1 (en) 1986-12-20 1986-12-20 ADJUSTMENT DEVICE FOR A FRICTION TOOL.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19860117850 EP0272339B2 (en) 1986-12-20 1986-12-20 Feed mechanism for an abradant honing tool

Publications (3)

Publication Number Publication Date
EP0272339A1 EP0272339A1 (en) 1988-06-29
EP0272339B1 EP0272339B1 (en) 1990-12-19
EP0272339B2 true EP0272339B2 (en) 1994-06-22

Family

ID=8195664

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860117850 Expired - Lifetime EP0272339B2 (en) 1986-12-20 1986-12-20 Feed mechanism for an abradant honing tool

Country Status (3)

Country Link
EP (1) EP0272339B2 (en)
DE (1) DE3676310D1 (en)
ES (1) ES2019581B3 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2194821A (en) * 1938-08-19 1940-03-26 Norton Co Honing machine
DE2619741C2 (en) * 1976-05-05 1985-12-05 Maschinenfabrik Gehring Gmbh & Co Kg, 7302 Ostfildern Infeed device for a cutting tool for machining workpiece bores, in particular a honing tool
FR2419142A1 (en) * 1978-03-06 1979-10-05 Citroen Sa BREAK-IN HEAD
DE3421193A1 (en) * 1984-06-07 1985-12-12 Maschinenfabrik Gehring Gmbh & Co Kg, 7302 Ostfildern METHOD FOR ADJUSTING A HONING TOOL AND DEVICE FOR CARRYING OUT THE METHOD

Also Published As

Publication number Publication date
DE3676310D1 (en) 1991-01-31
ES2019581B3 (en) 1991-07-01
EP0272339A1 (en) 1988-06-29
EP0272339B1 (en) 1990-12-19

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