EP0276439B1 - Method for grinding internally long bores with extremly small diameter in pieces and device for carrying out this method - Google Patents

Method for grinding internally long bores with extremly small diameter in pieces and device for carrying out this method Download PDF

Info

Publication number
EP0276439B1
EP0276439B1 EP87118373A EP87118373A EP0276439B1 EP 0276439 B1 EP0276439 B1 EP 0276439B1 EP 87118373 A EP87118373 A EP 87118373A EP 87118373 A EP87118373 A EP 87118373A EP 0276439 B1 EP0276439 B1 EP 0276439B1
Authority
EP
European Patent Office
Prior art keywords
wire
tensioning means
bore
base plate
grinding
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
EP87118373A
Other languages
German (de)
French (fr)
Other versions
EP0276439A1 (en
Inventor
Günter Frohn
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.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to AT87118373T priority Critical patent/ATE61958T1/en
Publication of EP0276439A1 publication Critical patent/EP0276439A1/en
Application granted granted Critical
Publication of EP0276439B1 publication Critical patent/EP0276439B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
    • B24B5/36—Single-purpose machines or devices
    • B24B5/48—Single-purpose machines or devices for grinding walls of very fine holes, e.g. in drawing-dies
    • B24B5/485—Single-purpose machines or devices for grinding walls of very fine holes, e.g. in drawing-dies using grinding wires or ropes

Definitions

  • Bores with a diameter of 10 mm are still exactly up to a length of 100 mm, with a diameter of 6 mm still up to 60 mm, with a diameter of 2 mm up to 30 mm, with a diameter of 1 mm only up to 20 mm and with a diameter of 0.5 mm only up to 5 mm.
  • High dimensional accuracy on the inner walls of bores can be achieved by machining on honing machines.
  • the honing tool clamped and driven on one side can be hydraulically expanded in such a way that the honing stones lie against the bore wall with uniform pressure. While the tool is rotating at high speed, the tool is moved back and forth in the axial direction or the movements are reversed.
  • a disadvantage of such a honing process is the fact that the honing tool guides itself independently in the bore and therefore adapts to the axis inaccuracies, so that sometimes such tools can only achieve insufficient axial parallelism of the inner wall of the bores. Because of the necessary tools, such honing processes are also limited to the use of bores with a relatively large inner diameter.
  • the object of the invention is to propose a method for internal grinding of long bores with extremely small diameters in workpieces, with which a high dimensional accuracy and parallelism of the inner wall of the bore is achieved.
  • a method which is characterized by the use of a rotating at high speed, slightly under tension its tensile strength, longitudinally reciprocating steel wire with high tensile strength with abrasives on its surface as a grinding tool, around which the workpiece with its bore to be machined rotates eccentrically and axially parallel to the wire while resting against the inner wall of the bore.
  • Steel wires are used, the tensile strength of which is higher than 2100 Newton / mm2.
  • Such a method enables the internal grinding of bores of any length of any diameter, but in particular with an extremely small diameter, since a corresponding tensile steel wire with a small diameter can be used as a grinding tool, which is clamped to slightly below its elastic limit.
  • the alignment of the bore or its inner wall on the tensioned wire leads to an extraordinarily high accuracy of the axis parallelism when the workpiece is appropriately set up and to high dimensional accuracy when using appropriate surface coatings of the wire or when using the grinding pastes.
  • a device which is characterized by two clamping devices which can be driven in rotation via synchronized drives and can be moved back and forth in the axial direction with a common base plate, between which a steel wire is held under tension by means of abrasives on its surface and by one the wire retractable in the vertical direction, rotating the workpiece driving workpiece holder.
  • wires can be used as grinding tools of great length, tensioned and driven in rotation.
  • Workpieces with internal bores can be treated for a correspondingly long time.
  • Such a device is preferably characterized by two clamping devices that can be set up on the base plate at a distance from one another for the grinding tool serving wire, of which at least one clamping device is displaceable and a pressure cylinder, preferably a hydraulic cylinder, is arranged between the two clamping devices.
  • the workpiece holder consists of two motor-driven rollers arranged parallel to the clamped wire as friction drive for a cylindrical workpiece to be machined. The rollers are mounted in a holder that can be set up with high accuracy in the vertical direction to the wire.
  • One clamping device is slidably arranged with its drive motor on a carriage on the machine table, while the other clamping device with its motor is fixed on the base plate.
  • the cylindrical workpiece to be machined for example a hard metal core
  • the cylindrical workpiece to be machined can be set up in a simple manner around the clamped wire serving as a grinding tool.
  • two clamping devices 4 and 5 are arranged on a back-and-forth base plate 1 at an adjustable distance from one another, between which a steel wire 2 serving as a grinding tool is held taut with a high tensile strength.
  • the tensile stress is slightly below the elastic limit of the wire.
  • a clamping device 4 together with its drive motor 42 and a belt drive 43 with a stand 41, is fixedly arranged on the base plate 1.
  • the second clamping device 5 is placed with its motor 52 and the belt drive 54 with a stand 51 on a carriage 53 which is displaceable on the base plate 1.
  • a hydraulic pressure cylinder 7, which engages the stands 41 and 51, is arranged between the two clamping devices 4 and 5 and sets the clamped wire 2 under tension.
  • the bearings of the rotatingly driven clamping device 4 and 5 are accordingly axially loadable, for example so-called shoulder bearings.
  • the workpiece 3 to be machined for example a long hard metal core, is aligned with its bore 31 around the wire 2 and aligned axially parallel.
  • the workpiece 3 rests on the workpiece holder designated overall by the number 6. It consists of two rollers 61, which are aligned exactly parallel to the wire 2 and are driven by the belt drive 65 and are mounted in a holder 62.
  • the holder can be moved exactly on the guides 64 with a block 63 in the vertical direction.
  • the workpiece 3 is set in rotation by the rollers 61.
  • the wire 2 held in tension rotates with a high number of wires, approximately 100,000 revolutions / minute, with its clamping devices 4 and 5.
  • the surface of the wire itself is coated with a diamond grit or an abrasive paste.
  • the workpiece 3 rotates eccentrically parallel to this wire, with the inner wall the bore 31 is ground.
  • the wire 2 with its clamping devices 4, 5 is moved back and forth in the axial direction by a correspondingly driven movement of the base plate 1.
  • the workpiece 3 can still be pressed against the wire 2 with a pressure roller 8 during its processing.
  • Workpieces with long through bores with extremely small bore diameters can be ground on a device according to the invention with the method according to the invention.
  • the diameter of the grinding wire is adapted to the bore. For example, holes with a diameter of 0.3 mm can be machined on the inside with almost any length of the hole with exact dimensional accuracy and parallelism.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Abstract

There is provided a method and apparatus for inside surface finishing with a high degree of dimensional accuracy and axial parallelism for long bores of very small diameter in work pieces. The method employs a high tensile strength steel wire as the grinding tool rotating at high speed under tension just below its yield strength. The wire is reciprocally moved back and forth in an axial direction and is coated with abrasive material. The work piece with the wire passing through its bore to be surface finished, is rotated eccentrically with respect to the wire and is axially parallel thereto. The inner wall of the bore is pressed against the wire which passes therethrough. The apparatus includes two clamping devices which reciprocally move back and forth together with a common base plate and which are rotated by synchronized drives. Between the two clamping devices the wire is stressed under tension, and a work piece holder which can be moved in a vertical direction transverse to the wire rotates the work piece.

Description

Für zahlreiche industrielle Verwendungszwecke werden in Werkstücken relativ lange Bohrungen mit extrem geringem Durchmesser und hoher Maßgenauigkeit an den Bohrungsinnenflächen verlangt, beispielsweise in Hartmetallkernen für die Schraubenherstellung oder in Fließpreßmatrizen zur Herstellung von Radbolzen oder dergleichen. Zur Herstellung von kurzen Bohrungen in derartigen Werkstücken eignen sich Schleifverfahren mit einseitig gelagerten, rotierend angetriebenen Stiften mit einem an seiner Mantelfläche beschichteten zylindrischen Schleifkopf. Mit einem solchen Werkzeug lassen sich jedoch nur relativ kurze Bohrungen innen mit ausreichender Maßgenauigkeit bearbeiten wegen der auftretenden Exzentrizität im Bereich des Schleifkopfes. Je geringer der Bohrungsdurchmesser der zu bearbeitenden Bohrung, um so geringer wird die mögliche exakte Bearbeitungstiefe mit einem solchen Werkzeug. So sind Bohrungen mit einem Durchmesser von 10 mm noch exakt bis zu einer Länge von 100 mm, mit einem Durchmesser von 6 mm noch bis 60 mm, mit einem Durchmesser von 2 mm noch bis 30 mm, mit Durchmesser von 1 mm nur noch bis 20 mm und mit einem Durchmesser von 0,5 mm nur noch bis 5 mm zu bearbeiten.For numerous industrial uses, relatively long bores with extremely small diameters and high dimensional accuracy are required on the inner surfaces of the bores in workpieces, for example in hard metal cores for screw production or in extrusion dies for the production of wheel bolts or the like. For the production of short bores in workpieces of this type, grinding processes with single-sided, rotatingly driven pins with a cylindrical grinding head coated on its outer surface are suitable. With such a tool, however, only relatively short bores can be made on the inside Process sufficient dimensional accuracy due to the eccentricity occurring in the area of the grinding head. The smaller the bore diameter of the bore to be machined, the smaller the possible exact machining depth with such a tool. Bores with a diameter of 10 mm are still exactly up to a length of 100 mm, with a diameter of 6 mm still up to 60 mm, with a diameter of 2 mm up to 30 mm, with a diameter of 1 mm only up to 20 mm and with a diameter of 0.5 mm only up to 5 mm.

Hohe Maßgenauigkeit an den Innenwänden von Bohrungen lassen sich durch Bearbeiten auf Honmaschinen erzielen. Das einseitig eingespannte und angetriebene Honwerkzeug kann dabei hydraulisch so aufgeweitet werden, daß die Honsteine mit gleichmäßigem Druck an der Bohrungswand anliegen. Während das Werkzeug mit hoher Drehzahl rotiert, wird das Werkzeug in Achsrichtung hin-und herbewegt oder die Bewegungen sind umgekehrt. Nachteil eines solchen Honverfahrens ist die Tatsache, daß sich das Honwerkzeug in der Bohrung selbständig führt und sich daher den Achsungenauigkeiten anpaßt, so daß mit derartigen Werkzeugen teilweise nur eine unzureichende Achsparallelität der Innenwandung der Bohrungen erreicht werden kann. Solche Honverfahren sind wegen des notwendigen Werkzeuges auch auf den Einsatz von Bohrungen mit relativ großem Innendurchmesser beschränkt.High dimensional accuracy on the inner walls of bores can be achieved by machining on honing machines. The honing tool clamped and driven on one side can be hydraulically expanded in such a way that the honing stones lie against the bore wall with uniform pressure. While the tool is rotating at high speed, the tool is moved back and forth in the axial direction or the movements are reversed. A disadvantage of such a honing process is the fact that the honing tool guides itself independently in the bore and therefore adapts to the axis inaccuracies, so that sometimes such tools can only achieve insufficient axial parallelism of the inner wall of the bores. Because of the necessary tools, such honing processes are also limited to the use of bores with a relatively large inner diameter.

Die Aufgabe der Erfindung besteht darin, ein Verfahren zum Innenschleifen von langen Bohrungen mit extrem geringem Durchmesser in Werkstücken vorzuschlagen, mit dem eine hohe Maßgenauigkeit und Achsparallelität der Bohrungsinnenwand erreicht wird.The object of the invention is to propose a method for internal grinding of long bores with extremely small diameters in workpieces, with which a high dimensional accuracy and parallelism of the inner wall of the bore is achieved.

Zur Lösung der Erfindungsaufgabe wird ein Verfahren vorgeschlagen welches gekennzeichnet ist durch die Verwendung eines mit hoher Drehzahl rotierenden, unter Zugspannung geringfügig unter seiner Dehngrenze stehenden, in Längsrichtung hin- und herbewegte Stahldrahtes mit hoher Zerreißfestigkeit mit Schleifmitteln an seiner Oberfläche als Schleifwerkzeug, um den das Werkstück mit seiner zu bearbeitenden Bohrung unter Anlage der Bohrungsinnenwand am Draht exzentrisch und achsparallel zum Draht rotiert. Verwendung finden dabei Stahldrähte, deren Reißfestigkeit höher als 2100 Newton/mm² ist.To solve the problem of the invention, a method is proposed which is characterized by the use of a rotating at high speed, slightly under tension its tensile strength, longitudinally reciprocating steel wire with high tensile strength with abrasives on its surface as a grinding tool, around which the workpiece with its bore to be machined rotates eccentrically and axially parallel to the wire while resting against the inner wall of the bore. Steel wires are used, the tensile strength of which is higher than 2100 Newton / mm².

Ein solches Verfahren ermöglicht die Innenschleifbearbeitung von beliebig langen Bohrungen jeden Durchmessers, insbesondere aber mit extrem geringem Durchmesser, da ein entsprechend zugfester Stahldraht mit geringem Durchmesser als Schleifwerkzeug eingesetzt werden kann, der bis geringfügig unterhalb seiner Dehngrenze gespannt ist. Die Ausrichtung der Bohrung bzw. ihrer Innenwand am gespannten Draht führt zu einer außerordentlich hohen Genauigkeit der Achsparallelität bei entsprechender Einrichtung des Werkstück und zu hohen Maßgenauigkeiten beim Einsatz entsprechender Oberflächenbeschichtungen des Drahtes bzw. bei Verwendung entsprechen der Schleifpasten.Such a method enables the internal grinding of bores of any length of any diameter, but in particular with an extremely small diameter, since a corresponding tensile steel wire with a small diameter can be used as a grinding tool, which is clamped to slightly below its elastic limit. The alignment of the bore or its inner wall on the tensioned wire leads to an extraordinarily high accuracy of the axis parallelism when the workpiece is appropriately set up and to high dimensional accuracy when using appropriate surface coatings of the wire or when using the grinding pastes.

Zur Durchführung des Verfahrens wird eine Vorrichtung vorgeschlagen, die gekennzeichnet ist durch zwei über synchrongesteuerte Antriebe rotierend angetreibbare, mit einer gemeinsamen Grundplatte in Achsrichtung hin- und herbewegbare Einspannvorrichtungen, zwischen denen ein Stahldraht mit Schleifmitteln an seiner oberfläche unter Zugspannung eingespannt gehalten ist und durch eine auf den Draht in senkrechter Richtung zufahrbare, das Werkstück rotierend antreibende Werkstückaufnahme. Bei einer solchen Vorrichtung lassen sich Drähte als Schleifwerkzeuge in großer Länge einsetzen, spannen und rotierend antreiben. Entsprechend lang können Werkstücke mit Innenbohrungen behandelt werden.To carry out the method, a device is proposed which is characterized by two clamping devices which can be driven in rotation via synchronized drives and can be moved back and forth in the axial direction with a common base plate, between which a steel wire is held under tension by means of abrasives on its surface and by one the wire retractable in the vertical direction, rotating the workpiece driving workpiece holder. With such a device, wires can be used as grinding tools of great length, tensioned and driven in rotation. Workpieces with internal bores can be treated for a correspondingly long time.

Vorzugsweise ist eine solche Vorrichtung gekennzeichnet durch zwei auf der Grundplatte im Abstand zueinander einrichtbare Einspannvorrichtungen für den als Schleifwerkzeug dienenden Draht, von denen mindestens eine Einspannvorrichtung verschiebbar und zwischen beiden Einspannvorrichtungen ein Druckzylinder, vorzugsweise ein hydraulischer Zylinder, angeordnet ist. Die Werkstückaufnahme besteht dabei aus zwei parallel zum eingespannten Draht angeordneten, motorisch angetriebenen Rollen als Reibantrieb für ein zu bearbeitendes zylindrisches Werkstück. Die Rollen sind dabei in einem Halter gelagert, der in vertikaler Richtung zum Draht mit hoher Genauigkeit einrichtbar ist. Eine Einspannvorrichtung ist dabei mit ihrem Antriebsmotor auf einem Schlitten auf dem Maschinentisch verschiebbar angeordnet, während die andere Einspannvorrichtung mit ihrem Motor auf der Grundplatte fest aufgeständert ist.Such a device is preferably characterized by two clamping devices that can be set up on the base plate at a distance from one another for the grinding tool serving wire, of which at least one clamping device is displaceable and a pressure cylinder, preferably a hydraulic cylinder, is arranged between the two clamping devices. The workpiece holder consists of two motor-driven rollers arranged parallel to the clamped wire as friction drive for a cylindrical workpiece to be machined. The rollers are mounted in a holder that can be set up with high accuracy in the vertical direction to the wire. One clamping device is slidably arranged with its drive motor on a carriage on the machine table, while the other clamping device with its motor is fixed on the base plate.

Mit einer solchen Vorrichtung ist das zu bearbeitende zylindrisch Werkstück, beispielsweise ein Hartmetallkern, in einfacher Weise um den als Schleifwerkzeug dienenden, eingespannten Draht einrichtbar.With such a device, the cylindrical workpiece to be machined, for example a hard metal core, can be set up in a simple manner around the clamped wire serving as a grinding tool.

Anhand eines abgebildeten Ausführungsbeispieles wird die Erfindung im folgenden näher erläütert. Es zeigen in schematischer Darstellung:

Fig. 1
eine Vorderansicht einer Vorrichtung zur Durchführung des erfindungsgemäßen Verfahrens,
Fig. 2
eine Draufsicht auf die Vorrichtung in Fig. 1 s und
Fig. 3
eine vergrößerte Schnittdarstellung nach der Linie I - I durch ein zu bearbeitendes zylindrisches Werkstück.
The invention is explained in more detail below on the basis of an illustrated exemplary embodiment. In a schematic representation:
Fig. 1
2 shows a front view of a device for carrying out the method according to the invention,
Fig. 2
a plan view of the device in Fig. 1 s and
Fig. 3
an enlarged sectional view along the line I - I through a cylindrical workpiece to be machined.

Wie aus den Figuren 1 und 2 ersichtlich, sind auf einer hin- und herbewegten Grundplatte 1 im einrichtbaren Abstand zueinander zwei Einspannvorrichtungen 4 und 5 angeordnet, zwischen denen ein als Schleifwerkzeug dienender Stahldraht 2 mit hoher Zerreißfestigkeit gespannt gehalten ist. Die Zugspannung liegt dabei geringfügig unterhalb der Dehngrenze des Drahtes. Dabei ist eine Einspannvorrichtung 4 zusammen mit ihrem Antriebsmotor 42 und einem Riementrieb 43 mit einem Ständer 41 auf der Grundplatte 1 fest angeordent. Die zweite Einspannvorrichtung 5 ist mit ihrem Motor 52 und dem Riementrieb 54 mit einem Ständer 51 auf einem Schlitten 53 aufgesetzt, der auf der Grundplatte 1 verschiebbar ist. Zwischen den beiden Einspannvorrichtungen 4 und 5 ist ein an den Ständern 41 und 51 angreifender hydraulischer Druckzylinder 7 angeordnet, der den eingespannten Draht 2 unter Zugspannung setzt. Die Lager der rotierend angetriebenen Einspannvorrichtung 4 und 5 sind dementsprechend axial belastbar, beispielsweise sogenannte Schulterlager.As can be seen from FIGS. 1 and 2, two clamping devices 4 and 5 are arranged on a back-and-forth base plate 1 at an adjustable distance from one another, between which a steel wire 2 serving as a grinding tool is held taut with a high tensile strength. The tensile stress is slightly below the elastic limit of the wire. A clamping device 4, together with its drive motor 42 and a belt drive 43 with a stand 41, is fixedly arranged on the base plate 1. The second clamping device 5 is placed with its motor 52 and the belt drive 54 with a stand 51 on a carriage 53 which is displaceable on the base plate 1. A hydraulic pressure cylinder 7, which engages the stands 41 and 51, is arranged between the two clamping devices 4 and 5 and sets the clamped wire 2 under tension. The bearings of the rotatingly driven clamping device 4 and 5 are accordingly axially loadable, for example so-called shoulder bearings.

Das zu bearbeitende Werkstück 3, beispielsweise ein langer Hartmetallkern, ist achsparallel ausgerichtet mit seiner Bohrung 31 um den Draht 2 herum angeordnet. Das Werkstück 3 ruht dabei auf der insgesamt mit der Ziffer 6 bezeichneten Werkstückaufnahme. Sie besteht aus zwei exakt parallel zum Draht 2 ausgerichteten über den Riementrieb 65 angetriebenen Rollen 61, die in einem Halter 62 gelagert sind. Der Halter ist mit einem Block 63 in senkrechter Richtung exakt an den Führungen 64 verfahrbar. Das Werkstück 3 wird durch die Rollen 61 in Rotation versetzt. Bei der Einrichtung wird die Werkstückaufnahme 6 so zum Draht 2 verfahren, daß die Innenwand der Bohrung 31 des Werkstückes 3 am Draht 2 anliegt. Der auf Zug gehaltene Draht 2 rotiert mit hoher Drahzahl, etwa 100.000 Umdrehung/Minute, mit seinen Einspannvorrichtungen 4 und 5. Der Draht selbst ist an seiner Oberfläche mit einer Diamantkörnung oder einer Schleifpaste beschichtet. Um diesen Draht rotiert das Werkstück 3 exzentrisch achsparallel, wobei die Innenwand der Bohrung 31 geschliffen wird. Während der schleifbehandlung wird der Draht 2 mit seinen Einspannvorrichtungen 4, 5 in Achsrichtung hin- und herbewegt durch entsprechend angetriebene Bewegung der Grundplatte 1. Das Werkstück 3 kann während seiner Bearbeitung noch mit einer Andrückrolle 8 gegen den Draht 2 gedrückt werden.The workpiece 3 to be machined, for example a long hard metal core, is aligned with its bore 31 around the wire 2 and aligned axially parallel. The workpiece 3 rests on the workpiece holder designated overall by the number 6. It consists of two rollers 61, which are aligned exactly parallel to the wire 2 and are driven by the belt drive 65 and are mounted in a holder 62. The holder can be moved exactly on the guides 64 with a block 63 in the vertical direction. The workpiece 3 is set in rotation by the rollers 61. When setting up the workpiece holder 6 is moved to the wire 2 so that the inner wall of the bore 31 of the workpiece 3 bears against the wire 2. The wire 2 held in tension rotates with a high number of wires, approximately 100,000 revolutions / minute, with its clamping devices 4 and 5. The surface of the wire itself is coated with a diamond grit or an abrasive paste. The workpiece 3 rotates eccentrically parallel to this wire, with the inner wall the bore 31 is ground. During the grinding treatment, the wire 2 with its clamping devices 4, 5 is moved back and forth in the axial direction by a correspondingly driven movement of the base plate 1. The workpiece 3 can still be pressed against the wire 2 with a pressure roller 8 during its processing.

Auf einer erfindungsgemäßen Vorrichtung lassen sich mit dem erfindungsgemäßen Verfahren Werkstücke mit langen durchgehenden Bohrungen mit extrem kleinem Bohrungsdurchmesser innenschleifen. Der Schleifdraht ist dabei in seinem Durchmesser jeweils der Bohrung angepaßt. So lassen sich beispielsweise mit exakter Maßgenauigkeit und Achsparallelität Bohrungen mit einem Durchmesser von 0,3 mm Innen bearbeiten bei nahezu beliebiger Länge der Bohrung.Workpieces with long through bores with extremely small bore diameters can be ground on a device according to the invention with the method according to the invention. The diameter of the grinding wire is adapted to the bore. For example, holes with a diameter of 0.3 mm can be machined on the inside with almost any length of the hole with exact dimensional accuracy and parallelism.

Möglich ist es mit dem erfindungsgemäßen Verfahren auch, abgesetzte Bohrungen zu bearbeiten durch Verwendung eines entsprechend abgesetzten Schleifdrahtes. Dabei ist die Hin-und Herbewegung des Drahtes entsprechend zu steuern.With the method according to the invention, it is also possible to machine stepped bores by using a correspondingly stepped grinding wire. The back and forth movement of the wire must be controlled accordingly.

Von besonderer Bedeutung für die erfindungsgemäße Schleifvorrichtung ist die exakte Synchronsteuerung der beiden Antriebsmotoren 42 und 52 der rotierend angetriebenen Einspannvorrichtungen 4 und 5.The exact synchronous control of the two drive motors 42 and 52 of the rotatingly driven clamping devices 4 and 5 is of particular importance for the grinding device according to the invention.

Claims (7)

  1. A method for the internal grinding in workpieces, with a high degree of dimensional accuracy and axis-parallelism, of long bores with extremely small diameters, characterised by the use of a steel wire (2) as a grinding tool, said wire rotating at high speed, being subjected to tensile stress slightly below its yield point, and being reciprocatingly displaced in a longitudinal direction, said wire having a tensile strength which is greater than 2100 N/mm², and having abrasives on its surface,the worpiece (3), with its bore (31) to be machined, rotating about said wire in an eccentric and axially-parallel manner relative to the wire (2), the inner wall of the bore thereby being in contact with the wire (2).
  2. A device for carrying out the method according to Claim 1, characterised by two tensioning means (4, 5) which are rotatingly drivable via the intermediary of synchronously controlled drive means (42, 52) and are reciprocatingly displaceable in an axial direction with a common base plate (1 ), a steel wire (2), with abrasives on its surface, being retained between said tensioning means in a tensioned manner under tensile stress, and a workpiece holder (6), which is movable towards the wire (2) in a vertical direction and rotatingly drives the workpiece (2).
  3. A device according to Claim 2, characterised by two tensioning means (4, 5) which may be disposed in a spaced-apart manner on a base plate (1) for tensioning the wire (2) which serves as a grinding tool, at least one of the tensioning means being displaceably disposed, and a pressure cylinder, preferably a hydraulic cylinder (7), being disposed between the two tensioning means (4, 5).
  4. A device according to Claim 2, characterised in that the workpiece holder (6) includes two motor-driven rollers (61), which are disposed parallel to the tensioned wire (2) and are mounted in a support member (62).
  5. A device according to Claim 2, characterised by a wire (2) which is provided with a ground diamond coating or the like.
  6. A device according to Claim 1, characterised by a bare wire which is coated with an abrasive paste.
  7. A device according to Claim 3, characterized in that one tensioning means (5) is displaceably disposed with its drive motor (52) on a carriage (53) on the base plate (1), while the other tensioning means (4) is fixedly mounted overhead with its motor (42) on the base plate (1).
EP87118373A 1987-01-17 1987-12-11 Method for grinding internally long bores with extremly small diameter in pieces and device for carrying out this method Expired - Lifetime EP0276439B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87118373T ATE61958T1 (en) 1987-01-17 1987-12-11 PROCESS FOR INTERNAL GRINDING OF LONG HOLES OF EXTREMELY SMALL DIAMETER IN WORKPIECES AND DEVICE FOR CARRYING OUT THE PROCESS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3701219A DE3701219C1 (en) 1987-01-17 1987-01-17 Process for internal grinding of bores with a small diameter / length ratio
DE3701219 1987-01-17

Publications (2)

Publication Number Publication Date
EP0276439A1 EP0276439A1 (en) 1988-08-03
EP0276439B1 true EP0276439B1 (en) 1991-03-27

Family

ID=6318981

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87118373A Expired - Lifetime EP0276439B1 (en) 1987-01-17 1987-12-11 Method for grinding internally long bores with extremly small diameter in pieces and device for carrying out this method

Country Status (6)

Country Link
US (1) US4831783A (en)
EP (1) EP0276439B1 (en)
JP (1) JPS63180454A (en)
AT (1) ATE61958T1 (en)
DE (2) DE3701219C1 (en)
ES (1) ES2023176B3 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111805316A (en) * 2020-08-31 2020-10-23 山东鲁电线路器材有限公司 Polishing equipment for polishing hollow core rod of composite insulator

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0631840A1 (en) * 1993-06-28 1995-01-04 Urs Tschudin Cylindrical grinding machine
US7959492B2 (en) 2006-09-11 2011-06-14 Showa Denko K.K. Disk-shaped substrate inner circumference polishing method
JP4252077B2 (en) * 2006-09-11 2009-04-08 昭和電工株式会社 Method for polishing inner circumference of disk-shaped substrate
CN109483344A (en) * 2018-12-25 2019-03-19 苏州创易技研股份有限公司 Line mouth hole abrading machine
CN111642871A (en) * 2020-06-30 2020-09-11 福州依强珠宝首饰有限公司 Gem with novel structure and manufacturing process thereof
CN113427333B (en) * 2021-06-08 2022-06-07 大连理工大学 Deep hole polishing device and polishing method
CN114473660B (en) * 2022-01-29 2022-12-16 南通海峰家居用品有限公司 Plastic products internal surface processing equipment that polishes
CN115319558A (en) * 2022-10-13 2022-11-11 江苏吉鼎金属制品有限公司 Grinding device based on metal product processing
DE102022004923A1 (en) 2022-12-20 2024-06-20 Friedrich-Schiller-Universität Jena, Körperschaft des öffentlichen Rechts Device and method for finishing bores

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US925233A (en) * 1909-03-02 1909-06-15 Edward Schmidmer Machine for polishing diamond draw-plates.
US1428209A (en) * 1920-04-06 1922-09-05 Western Electric Co Mechanism for lapping diamond dies
US2047055A (en) * 1934-06-01 1936-07-07 Heald Machine Co Grinding machine and method
US2369094A (en) * 1942-10-01 1945-02-06 Hamilton Watch Co Jewel oliving machine
CH483916A (en) * 1967-09-04 1970-01-15 Kunz Hans Grandier for bearing stones
DE2347780C3 (en) * 1973-09-22 1981-02-05 Maschinenfabrik Gehring Gmbh & Co Kg, 7302 Ostfildern Honing machine
US4069805A (en) * 1977-01-25 1978-01-24 Philip Sherman Wire apparatus for abrasive powder machining
JPS5845860A (en) * 1981-09-10 1983-03-17 Toshiba Corp Lapping unit
FR2518003A1 (en) * 1981-12-14 1983-06-17 Snecma Reconditioning small diameter holes - by burnishing with wire rotating at high speed
JPS5933511A (en) * 1982-08-19 1984-02-23 Fanuc Ltd Accelerating and decelerating device
DE3346291A1 (en) * 1983-12-21 1985-07-04 Siemens Ag METHOD AND DEVICE FOR QUICKLY DETERMINING A NETWORK SYNCHRONOUS REFERENCE VOLTAGE FOR A NETWORKED RECTIFIER AFTER A MAINS FAILURE

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111805316A (en) * 2020-08-31 2020-10-23 山东鲁电线路器材有限公司 Polishing equipment for polishing hollow core rod of composite insulator
CN111805316B (en) * 2020-08-31 2021-01-08 山东鲁电线路器材有限公司 Polishing equipment for polishing hollow core rod of composite insulator

Also Published As

Publication number Publication date
ATE61958T1 (en) 1991-04-15
ES2023176B3 (en) 1992-01-01
EP0276439A1 (en) 1988-08-03
JPS63180454A (en) 1988-07-25
US4831783A (en) 1989-05-23
DE3768935D1 (en) 1991-05-02
DE3701219C1 (en) 1988-09-01

Similar Documents

Publication Publication Date Title
DE10234707B4 (en) Method and device for grinding a rotationally symmetrical machine component
EP0276439B1 (en) Method for grinding internally long bores with extremly small diameter in pieces and device for carrying out this method
DE10153813B4 (en) Polishing device for polishing outer peripheral portions of a plate-shaped workpiece
EP1286794B1 (en) Cold rolling machine
EP1514640A2 (en) Method and apparatus for finishing shafts, especially crank- and camshafts
DE4227315C2 (en) Machine for grinding, short stroke honing and polishing the outer surface of workpieces
DE3132560A1 (en) "Method and machine tool for round machining of eccentric shaft cross-sections, in particular crankshaft crankpins"
DE2538209A1 (en) Fully automatic twin-spindle surface grinder - for simultaneously grinding all four sides of dovetail guides
DE2818667A1 (en) MACHINE TOOL FOR SPATIAL POLISHING WITH MAGNETIC GRINDING POWDER IN THE MAGNETIC FIELD OF WORKPIECES IN THE SHAPE OF A ROTATING BODY
DE19821982C2 (en) Profile belt grinder
DE19800885A1 (en) Device for finishing peripheral surfaces on rotating workpieces, in particular for finishing cam discs and cams of a camshaft
DE102005015649A1 (en) Rotating and precision machining process for workpiece involves use of precision machining device, and rotating and precision machining at same setting
DE2427826A1 (en) Rotary machine tool incorporating compound slide - is fitted with lifter type tool holder control supported by eccentric
DE2851919A1 (en) GRINDING METHOD AND DEVICE
DE3147840A1 (en) Copy-milling, copy-grinding or copy-drilling machine
EP4149717B1 (en) Device and method for grinding and honing, and use of the device
EP2214864B1 (en) Method and device for producing a gear rack, particularly for a steering system in a vehicle
DE2953805A1 (en) Device for abrasive conditioning billets with a form of body of revolution
DE905103C (en) Grinding machine, especially for snap gauges
DE1615201C (en) Machine for electric spark processing for the production of holes and openings with the help of a powerful tool electrode
DE29807066U1 (en) Holding device for grinding and polishing surfaces
DE908224C (en) Device for mechanical filing, grinding, shaping and polishing, in particular of steel pieces
DE2210276A1 (en) MACHINE FOR THE SIMULTANEOUS PROCESSING OF SEVERAL NEARBY SURFACES OF A WORKPIECE OF ANY, IN PARTICULAR ANGULAR SHAPE
DE19800515A1 (en) Machining of grinding center profile
DE2433835A1 (en) Finish machining for flat and spherical surfaces - honing tool moved along closed curve by oscillation device

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE ES FR GB GR IT LI LU NL SE

17P Request for examination filed

Effective date: 19890113

17Q First examination report despatched

Effective date: 19900725

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE ES FR GB GR IT LI LU NL SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19910327

Ref country code: NL

Effective date: 19910327

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 19910327

Ref country code: BE

Effective date: 19910327

REF Corresponds to:

Ref document number: 61958

Country of ref document: AT

Date of ref document: 19910415

Kind code of ref document: T

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
REF Corresponds to:

Ref document number: 3768935

Country of ref document: DE

Date of ref document: 19910502

ITF It: translation for a ep patent filed

Owner name: SOCIETA' ITALIANA BREVETTI S.P.A.

ET Fr: translation filed
NLV1 Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19911231

Ref country code: AT

Effective date: 19911231

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2023176

Country of ref document: ES

Kind code of ref document: B3

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19920415

Year of fee payment: 5

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19930901

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19951025

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 19951108

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19951214

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19951221

Year of fee payment: 9

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19961211

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 19961212

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19961231

Ref country code: CH

Effective date: 19961231

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19961211

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19970829

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20010301

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20051211