EP2260976A1 - Surface grinding machine and device for setting up same - Google Patents

Surface grinding machine and device for setting up same Download PDF

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Publication number
EP2260976A1
EP2260976A1 EP09007669A EP09007669A EP2260976A1 EP 2260976 A1 EP2260976 A1 EP 2260976A1 EP 09007669 A EP09007669 A EP 09007669A EP 09007669 A EP09007669 A EP 09007669A EP 2260976 A1 EP2260976 A1 EP 2260976A1
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EP
European Patent Office
Prior art keywords
workpiece
grinding machine
surface grinding
torque
workpiece holder
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.)
Granted
Application number
EP09007669A
Other languages
German (de)
French (fr)
Other versions
EP2260976B1 (en
Inventor
Harald Wirch
Simon Wolber
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.)
Supfina Grieshaber GmbH and Co KG
Original Assignee
Supfina Grieshaber GmbH and Co KG
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 Supfina Grieshaber GmbH and Co KG filed Critical Supfina Grieshaber GmbH and Co KG
Priority to EP09007669A priority Critical patent/EP2260976B1/en
Priority to AT09007669T priority patent/ATE519566T1/en
Priority to CN2010102029171A priority patent/CN102029556A/en
Publication of EP2260976A1 publication Critical patent/EP2260976A1/en
Application granted granted Critical
Publication of EP2260976B1 publication Critical patent/EP2260976B1/en
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Anticipated expiration legal-status Critical

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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
    • B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
    • B24B7/04—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor involving a rotary work-table
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
    • 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
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • 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
    • B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
    • B24B7/10—Single-purpose machines or devices
    • B24B7/16—Single-purpose machines or devices for grinding end-faces, e.g. of gauges, rollers, nuts, piston rings
    • B24B7/17—Single-purpose machines or devices for grinding end-faces, e.g. of gauges, rollers, nuts, piston rings for simultaneously grinding opposite and parallel end faces, e.g. double disc grinders

Definitions

  • the present invention relates to a surface grinding machine comprising at least one grinding tool, a workpiece holder for holding at least one workpiece, and drive means for driving the workpiece holder in a rotational direction.
  • the workpiece holder is used to bring a held on the workpiece holder workpiece in engagement with at least one grinding tool.
  • Corresponding careful coordination is required in the region of a workpiece outlet of the machining area in order to avoid tilting between the workpiece, the workpiece holder, the grinding tool and an outlet guide adjoining the machining area in this area.
  • the present invention has the object to prevent damage to a surface grinding machine.
  • the surface grinding machine according to the invention makes it possible to solve a rotationally fixed connection between the drive device and the workpiece holder in dependence on a predefinable limit torque.
  • This makes it possible to apply the drive torques required for a surface grinding machining of a workpiece, but when reaching a limit torque, the rotationally fixed connection is solved.
  • This has the consequence that the drive device can be decoupled from the workpiece holder and damage described above the surface grinding machine can be prevented.
  • the predefinable limit torque is exceeded, it is prevented by releasing the rotationally fixed connection between the drive device and the workpiece holder, that the workpiece holder is driven in a canted with a workpiece and / or with other components of the surface grinding machine state in the direction of rotation.
  • the surface grinding machine according to the invention is particularly advantageous when a disk-shaped workpiece holder is used whose height is, for example, a maximum of about 1 cm or only a few millimeters.
  • a flat workpiece holder has the advantage that also the machining of very flat workpieces is possible, but has the disadvantage that the workpiece holder does not have a high deformation resistance.
  • the workpiece holders may have a large area with a diameter of 50 cm to 100 cm or more in comparison with their thickness, they are particularly susceptible to deformation due to tilting of the workpiece holder with a workpiece and / or with other parts of the surface grinding machine.
  • the surface grinding machine according to the invention also makes it possible to set them up with less care and with higher tolerances.
  • the predetermined limit torque is set manually, for example, based on empirical values.
  • a control device is provided which adjusts the limit torque of the clutch device as a function of an actually occurring maximum drive torque. In this case, it is preferable if the limit torque is set higher than the actually occurring maximum drive torque in order to prevent inadvertent release of the rotationally fixed connection.
  • the coupling device is designed in the form of an electromagnetic clutch. This has the advantage that the limit torque is particularly precisely adjustable.
  • the rotationally fixed connection is a frictional connection. As a result, the mechanical load of mutually engaging coupling elements can be reduced.
  • the surface grinding machine is preferably designed as a double-surface grinding machine, which has two grinding tools, between which a grinding gap in which a workpiece is machinable on opposite workpiece surfaces.
  • the invention further relates to a method for setting up a surface grinding machine, wherein the surface grinding machine comprises at least one grinding tool, a workpiece holder for holding at least one workpiece and a drive device for driving the workpiece holder in a rotational direction.
  • the present invention has the further object of providing a method for setting up a surface grinding machine, with which damage to the surface grinding machine can be prevented.
  • This object is achieved in a method mentioned above according to the invention, that during the grinding machining of at least one sample workpiece actually occurring maximum drive torque is determined, and that between the drive device and the workpiece holder a rotationally fixed connection is made, which in a function of the maximum drive torque certain limit torque is solvable.
  • drive torques occurring during regular operation of the surface grinding machine can be determined in a simple manner and accurately.
  • the limit torque, which is then to be specified in the regular operation of the surface grinding machine, is determined as a function of the actually occurring maximum drive torque.
  • One possibility for detecting the actually occurring maximum drive torque is to detect the energy requirement of the drive device. For example, voltage and / or current values with which the drive device is operated can be detected.
  • a torque-measuring device it is possible to measure the actually occurring maximum drive torque with a torque-measuring device.
  • a measuring device is arranged in a spatial relationship to the coupling device, for example between the drive device and the coupling device or between the coupling device and the workpiece holder.
  • the limit torque is equal to the maximum drive torque multiplied by a factor of greater than one. In this way, it can be ensured that slight exceedances of the maximum drive torque measured with the aid of the sample workpiece do not lead to an undesirable release of the clutch device in the regular operation of the surface grinding machine.
  • the limit torque is equal to the maximum drive torque multiplied by a factor of less than about 1.5.
  • the factor is between about 1.1 and about 1.3.
  • the at least one sample workpiece has the same geometry as a raw workpiece that is to be flat-ground by means of the surface grinding machine.
  • the actually occurring maximum drive torque can be determined particularly accurately.
  • maximum drive torques determined with the aid of trial workpieces and, if appropriate, their associated limit torques are stored, so that these values are already known and can be used after a new set-up of the surface grinding machine.
  • the maximum drive torque is determined when an engagement surface between the at least one grinding tool and the at least one sample workpiece is maximum. In this state of the surface grinding machine, the friction surfaces between the workpiece and the grinding tool are maximized, so that maximum drive torques occur in this state. If a plurality of workpieces are simultaneously machined in the processing area, the maximum drive torque and thus the limit torque increase accordingly.
  • An embodiment of an in FIG. 1 Plane grinding machine designated overall by the reference numeral 10 is designed as a double-surface grinding machine and comprises two grinding wheels, of which in FIG. 1 an upper grinding wheel 12 is indicated in dot-dashed form.
  • the upper grinding wheel 12 and the lower grinding wheel are each rotatably driven about a grinding wheel axis 14.
  • the surface grinding machine 10 further comprises a disc-shaped workpiece holder 16 which is rotatably driven about a workpiece holder axis 18.
  • the workpiece holder axis 18 and the grinding wheel axis 14 are mutually parallel or inclined by a few degrees, for example up to a maximum of 5 °, relative to each other.
  • the workpiece holder 16 comprises a plurality of workpiece holders 20, which are preferably identically spaced in the radial direction relative to the workpiece holder axis 18 and are also preferably identically spaced relative to one another as viewed in the circumferential direction.
  • the workpiece holder 16 has at least two, in particular at least ten, workpiece holders 20.
  • a workpiece holder 20 can be formed for example by a hole-shaped material recess, which serves to receive a workpiece. In FIG. 1 a workpiece 22 is shown hatched for reasons of clarity.
  • the surface grinding machine 10 has an assembly area 24, in which unprocessed workpieces 22 can be inserted into a workpiece holder 20.
  • the insertion can be done by hand or by means of a loading device 26, which in particular has a magazine 28 for storing unprocessed workpieces 22.
  • the surface grinding machine 10 further includes a machining area 30 in which workpieces 22 held on the workpiece holder 16 are in face-grinding engagement with the upper grinding tool 12 and with the lower grinding tool.
  • the surface grinding machine 10 comprises a removal region 32, in which workpieces 22 can be removed from the workpiece holders 20.
  • the upper grinding tool 12 and the lower grinding tool are spaced apart from each other, so that a grinding gap is formed, in which workpieces 22 are received and supported in relation to the direction of gravity down and up.
  • the workpieces 22 are supported in the placement area 24 and in the removal area 32 at the bottom with the aid of workpiece supports not shown in the drawing.
  • the surface grinding machine 10 comprises a measuring device 34, which is arranged in an input region of the removal region 32. With the aid of the measuring device 34, a parallel to the extension direction of the grinding gap applied thickness of a workpiece 22 is measured.
  • the surface grinding machine 10 has, adjacent to the processing area 30, a first guide device 36 in the region of an inlet of the processing area 30 and a second guide device 38 in the area of an outlet of the processing area 30.
  • the guide devices 36 and 38 each have a plate-shaped guide element 40, 42 which has a guide surface 44 or 46 facing the workpiece holder 16.
  • the guide surfaces 44, 46 are each provided with a boundary 48 or 50.
  • unprocessed workpieces 22 can be pressed down against a workpiece support, not shown, with respect to the direction of gravity so that a workpiece relative to the direction of gravity exactly aligned relative to the grinding gap between the upper grinding tool 12 and the lower grinding tool can be.
  • a machined workpiece 22 can be guided out of the processing area 30 with the aid of the guide element 42 of the second guide device 38.
  • the surface grinding machine 10 further has in the removal region 32 on a workpiece removal 52, which is formed in particular in the form of a chute. About the workpiece removal 52 held on the workpiece holder 16, finished machined workpieces 22 downwards removed from the workpiece holders 20 and removed.
  • a drive device 56 For driving the workpiece holder 16 about the workpiece holder axis 18 in a direction of rotation 54, a drive device 56 is provided, which is designed in particular in the form of an electric motor.
  • the drive device 56 does not act directly on the workpiece holder 16, but with the interposition of a coupling device 58.
  • the coupling device 58 establishes a rotationally fixed connection between the drive device 56 and the workpiece holder 16 in an engaged state. Depending on a predefinable limit torque, the rotationally fixed connection of the coupling device 58 is released.
  • the limit torque of the clutch device 58 is controlled by means of a control device 60, which preferably also communicates with the drive device 56 for prescribing an energy requirement of the drive device 56.
  • the coupling device 58 is preferably in the form of an electromagnetic clutch 62, which in FIG. 3 is shown in more detail.
  • An input torque of the drive device 56 is transmitted to a friction lining carrier 66 by means of an input shaft 64.
  • the Reibbelagitati 66 has a Reibbelagability 68, in which a particular annular friction lining 70 is received.
  • the friction lining 70 is movable relative to the workpiece holder axis 18 in the axial direction.
  • the friction lining 70 has on its peripheral surface a toothing 72 which has a in Direction of rotation produces a positive connection with a corresponding toothing of the friction lining receptacle 68.
  • the friction lining 70 is magnetizable, so that it can be attracted by an annular electromagnet 74.
  • the solenoid 74 is rotatably connected to a solenoid holder 76, in which a coil, not shown, is integrated, which can be energized by means of a terminal 78.
  • the electromagnet 74 When energizing the coil, the electromagnet 74 generates a magnetic field, which presses the friction lining 70 against the electromagnet 74, so that a frictional engagement between these partners arises.
  • the strength of the frictional connection is dependent on the energization of the electromagnet 74, which is predetermined by means of the control device 60.
  • the magnet carrier 76 is non-rotatably connected to an output shaft 80, which is rotatably mounted in a stationary housing 84 via roller bearings 82.
  • the output shaft 80 is rotatably connected at its end facing away from the coupling device 58 with a Maschinenbauetzetz 86. Furthermore, the said end of the output shaft 80 is connected to a bolt 88, which penetrates a central recess of the workpiece holder 16. This cooperates with a clamping sleeve 90, with which a clamping bell 92 can be pressed from above onto the workpiece holder 16.
  • annular spacers 94 are arranged, which allow adaptation to different thicknesses of different workpiece holder 16.
  • the workpiece holder 16 is fixed against rotation between the spacer elements 94 and the clamping bell 92.
  • a drive torque of the drive device 56 is required, which correlates with the energy requirement of the drive device 56. From this, an actually occurring maximum drive torque can be determined, which is then multiplied by a factor of, for example, between about 1.1 and about 1.3. This results in a limit torque, which can be adjusted by means of the control device 60 on the coupling device 58 by appropriate energization of the electromagnet 74.
  • unprocessed workpieces 22 can be fed out of the loading device 28 out of the workpiece holder 16 and introduced into the processing region 30. After processing of the workpieces, these are brought out of the processing area 30 in the direction of rotation 54 by further movement of the workpiece holder 16 so that they can be removed from the workpiece holder 16 in the removal area 32.
  • the workpiece holder 16 is operated stepwise or continuously rotated.
  • the coupling device 58 is arranged with respect to the workpiece holder 16 on a side facing away from the drive means 56, for example between the clamping sleeve 90 and the clamping bell 92nd

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Abstract

The grinder (10) has a grinding tool, and a work piece holder (16) for holding a work piece. A drive device (56) drives the work piece holder in a rotational direction. A coupling device (58) i.e. electromagnetic coupling, provides a rotationally fixed connection between the drive device and work piece holder, where the connection is releasable at a preset limit torque by sliding the coupling device. A controller (60) adjusts the limit torque of the coupling device based on an actual resulting maximum drive torque. An independent claim is also included for a method for adjusting a surface grinder.

Description

Die vorliegende Erfindung betrifft eine Planschleifmaschine, umfassend mindestens ein Schleifwerkzeug, einen Werkstückhalter zum Halten mindestens eines Werkstücks, und eine Antriebseinrichtung zum Antreiben des Werkstückhalters in einer Drehrichtung.The present invention relates to a surface grinding machine comprising at least one grinding tool, a workpiece holder for holding at least one workpiece, and drive means for driving the workpiece holder in a rotational direction.

Bei Planschleifmaschinen der eingangs genannten Art wird der Werkstückhalter verwendet, um ein an dem Werkstückhalter gehaltenes Werkstück in Eingriff mit mindestens einem Schleifwerkzeug zu bringen. Hierbei ist es erforderlich, ein unbearbeitetes Werkstück mit einer hohen Genauigkeit an dem Werkstückhalter fixieren zu können, so dass bei Einführung des Werkstücks in den Bearbeitungsbereich des Schleifwerkzeugs das Werkstück, der Werkstückhalter und das Schleifwerkzeug nicht miteinander verkanten. Eine entsprechende sorgfältige Abstimmung ist im Bereich eines Werkstückauslaufs des Bearbeitungsbereichs erforderlich, um in diesem Bereich ein Verkanten zwischen dem Werkstück, dem Werkstückhalter, dem Schleifwerkzeug und einer sich an den Bearbeitungsbereich anschließenden Auslaufführung zu vermeiden.In surface grinding machines of the type mentioned above, the workpiece holder is used to bring a held on the workpiece holder workpiece in engagement with at least one grinding tool. In this case, it is necessary to be able to fix an unprocessed workpiece with high accuracy to the workpiece holder, so that when the workpiece is introduced into the processing area of the grinding tool, the workpiece, the workpiece holder and the grinding tool are not mutually connected tilt. Corresponding careful coordination is required in the region of a workpiece outlet of the machining area in order to avoid tilting between the workpiece, the workpiece holder, the grinding tool and an outlet guide adjoining the machining area in this area.

Darüber hinaus ist eine Übergabe von unbearbeiteten Werkstücken aus einer Bestückungseinrichtung in Werkstückaufnahmen des Werkstückhalters kritisch. Auch in diesem Bereich ist es möglich, dass bei nicht exakter Abstimmung aller Bauteile ein Werkstück mit diesen Bauteilen verkantet. All dies führt dazu, dass eine Planschleifmaschine äußerst sorgfältig eingerichtet werden muss, um eine Beschädigung von Bauteilen der Planschleifmaschine und/oder von Werkstücken zu vermeiden.In addition, a transfer of unprocessed workpieces from a loading device in workpiece holders of the workpiece holder is critical. In this area, too, it is possible that, if all components are not exactly matched, a workpiece will become jammed with these components. All this means that a surface grinding must be very carefully set up to avoid damage to components of the surface grinding machine and / or workpieces.

Hiervon ausgehend liegt der vorliegenden Erfindung die Aufgabe zugrunde, Beschädigungen einer Planschleifmaschine zu verhindern.On this basis, the present invention has the object to prevent damage to a surface grinding machine.

Diese Aufgabe wird bei einer Planschleifmaschine der eingangs genannten Art erfindungsgemäß gelöst durch eine Kupplungseinrichtung, welche zwischen der Antriebseinrichtung und dem Werkstückhalter eine drehfeste Verbindung bereitstellt, die bei einem vorgebbaren Grenzdrehmoment lösbar ist.This object is achieved according to the invention in a surface grinding machine of the type mentioned by a coupling device which provides a rotationally fixed connection between the drive device and the workpiece holder, which is releasable at a predetermined limit torque.

Die erfindungsgemäße Planschleifmaschine ermöglicht es, eine drehfeste Verbindung zwischen der Antriebseinrichtung und dem Werkstückhalter in Abhängigkeit eines vorgebbaren Grenzdrehmoments zu lösen. Dies ermöglicht es, die für eine planschleifende Bearbeitung eines Werkstücks erforderlichen Antriebsdrehmomente aufzubringen, wobei jedoch bei Erreichen eines Grenzdrehmoments die drehfeste Verbindung gelöst wird. Dies hat zur Folge, dass die Antriebseinrichtung von dem Werkstückhalter entkoppelt werden kann und eingangs beschriebene Beschädigungen der Planschleifmaschine verhindert werden können. Sobald das vorgebbare Grenzdrehmoment überschritten wird, wird durch Lösen der drehfesten Verbindung zwischen der Antriebseinrichtung und dem Werkstückhalter verhindert, dass der Werkstückhalter in einem mit einem Werkstück und/oder mit weiteren Bauteilen der Planschleifmaschine verkanteten Zustand weiter in Drehrichtung angetrieben wird.The surface grinding machine according to the invention makes it possible to solve a rotationally fixed connection between the drive device and the workpiece holder in dependence on a predefinable limit torque. This makes it possible to apply the drive torques required for a surface grinding machining of a workpiece, but when reaching a limit torque, the rotationally fixed connection is solved. This has the consequence that the drive device can be decoupled from the workpiece holder and damage described above the surface grinding machine can be prevented. Once the predefinable limit torque is exceeded, it is prevented by releasing the rotationally fixed connection between the drive device and the workpiece holder, that the workpiece holder is driven in a canted with a workpiece and / or with other components of the surface grinding machine state in the direction of rotation.

Die erfindungsgemäße Planschleifmaschine ist besonders vorteilhaft, wenn ein scheibenförmiger Werkstückhalter verwendet wird, dessen Bauhöhe beispielsweise maximal ungefähr 1 cm oder nur wenige Millimeter beträgt. Ein solcher flacher Werkstückhalter hat den Vorteil, dass auch die Bearbeitung sehr flacher Werkstücke möglich ist, hat jedoch den Nachteil, dass der Werkstückhalter in sich keinen hohen Verformungswiderstand aufweist. Da die Werkstückhalter eine im Vergleich zu ihrer Dicke großflächige Ausdehnung mit einem Durchmesser von 50 cm bis 100 cm oder darüber hinaus aufweisen können, sind diese besonders anfällig gegen eine Verformung aufgrund eines Verkantens des Werkstückhalters mit einem Werkstück und/oder mit weiteren Teilen der Planschleifmaschine.The surface grinding machine according to the invention is particularly advantageous when a disk-shaped workpiece holder is used whose height is, for example, a maximum of about 1 cm or only a few millimeters. Such a flat workpiece holder has the advantage that also the machining of very flat workpieces is possible, but has the disadvantage that the workpiece holder does not have a high deformation resistance. Since the workpiece holders may have a large area with a diameter of 50 cm to 100 cm or more in comparison with their thickness, they are particularly susceptible to deformation due to tilting of the workpiece holder with a workpiece and / or with other parts of the surface grinding machine.

Durch die Lösbarkeit der drehfesten Verbindung zwischen dem Werkstückhalter und der Antriebseinrichtung und dem damit einhergehenden Stopp des Werkstückhalters können auch weitere Bauteile der Planschleifmaschine vor Beschädigungen geschützt werden, beispielsweise im Bereich eines Werkstückeinlaufs und eines Werkstückauslaufs des Bearbeitungsbereichs. Gleiches gilt für den Schutz einer gegebenenfalls vorhandenen Bestückungseinrichtung, mittels welcher der Werkstückhalter mit unbearbeiteten Werkstücken bestückt werden kann. Hierdurch wird auch eine gegebenenfalls im Bereich des Werkstückhalters angeordnete Messeinrichtung zur Messung einer Geometrie eines bearbeiteten Werkstücks vor Beschädigungen geschützt.Due to the solvability of the rotationally fixed connection between the workpiece holder and the drive device and the concomitant stop the workpiece holder and other components of the surface grinding machine can be protected from damage, for example in the region of a workpiece inlet and a workpiece outlet of the processing area. The same applies to the protection of any existing equipment, by means of which of the workpiece holders can be equipped with unprocessed workpieces. As a result, a measuring device optionally arranged in the region of the workpiece holder for measuring a geometry of a machined workpiece is also protected from damage.

Die erfindungsgemäße Planschleifmaschine ermöglicht es auch, diese mit einer geringeren Sorgfalt und mit höheren Toleranzen behaftet einrichten zu können.The surface grinding machine according to the invention also makes it possible to set them up with less care and with higher tolerances.

Im Rahmen der Erfindung ist es möglich, dass das vorgebbare Grenzdrehmoment manuell eingestellt wird, beispielsweise aufgrund von Erfahrungswerten. Bevorzugt ist es jedoch, wenn eine Steuereinrichtung vorgesehen ist, welche in Abhängigkeit eines tatsächlich auftretenden maximalen Antriebsmoments das Grenzdrehmoment der Kupplungseinrichtung einstellt. Hierbei ist es bevorzugt, wenn das Grenzdrehmoment höher als das tatsächlich auftretende maximale Antriebsmoment eingestellt wird, um ein unbeabsichtigtes Lösen der drehfesten Verbindung zu verhindern.In the context of the invention, it is possible that the predetermined limit torque is set manually, for example, based on empirical values. However, it is preferred if a control device is provided which adjusts the limit torque of the clutch device as a function of an actually occurring maximum drive torque. In this case, it is preferable if the limit torque is set higher than the actually occurring maximum drive torque in order to prevent inadvertent release of the rotationally fixed connection.

Vorzugsweise ist die Kupplungseinrichtung in Form einer elektromagnetischen Kupplung ausgebildet. Dies hat den Vorteil, dass das Grenzdrehmoment besonders exakt einstellbar ist.Preferably, the coupling device is designed in the form of an electromagnetic clutch. This has the advantage that the limit torque is particularly precisely adjustable.

Bevorzugt ist es ferner, wenn die drehfeste Verbindung eine reibschlüssige Verbindung ist. Hierdurch kann die mechanische Belastung von miteinander in Eingriff stehenden Kupplungselementen reduziert werden.It is further preferred if the rotationally fixed connection is a frictional connection. As a result, the mechanical load of mutually engaging coupling elements can be reduced.

Die Planschleifmaschine ist vorzugsweise als Doppelplanschleifmaschine ausgebildet, welche zwei Schleifwerkzeuge aufweist, zwischen denen ein Schleifspalt ausgebildet, in welchem ein Werkstück auf einander entgegengesetzten Werkstückoberflächen bearbeitbar ist. Die Erfindung betrifft ferner ein Verfahren zur Einrichtung einer Planschleifmaschine, wobei die Planschleifmaschine mindestens ein Schleifwerkzeug, einen Werkstückhalter zum Halten mindestens eines Werkstücks und eine Antriebseinrichtung zum Antreiben des Werkstückhalters in einer Drehrichtung umfasst.The surface grinding machine is preferably designed as a double-surface grinding machine, which has two grinding tools, between which a grinding gap in which a workpiece is machinable on opposite workpiece surfaces. The invention further relates to a method for setting up a surface grinding machine, wherein the surface grinding machine comprises at least one grinding tool, a workpiece holder for holding at least one workpiece and a drive device for driving the workpiece holder in a rotational direction.

Der vorliegenden Erfindung liegt die weitere Aufgabe zugrunde, ein Verfahren zur Einrichtung einer Planschleifmaschine zu schaffen, mit welchem Beschädigungen der Planschleifmaschine verhindert werden können.The present invention has the further object of providing a method for setting up a surface grinding machine, with which damage to the surface grinding machine can be prevented.

Diese Aufgabe wird bei einem vorstehend genannten Verfahren erfindungsgemäß dadurch gelöst, dass während der schleifenden Bearbeitung mindestens eines Probe-Werkstücks ein tatsächlich auftretendes maximales Antriebsdrehmoment ermittelt wird, und dass zwischen der Antriebseinrichtung und dem Werkstückhalter eine drehfeste Verbindung hergestellt wird, die bei einem in Abhängigkeit des maximalen Antriebsdrehmoments bestimmten Grenzdrehmoment lösbar ist.This object is achieved in a method mentioned above according to the invention, that during the grinding machining of at least one sample workpiece actually occurring maximum drive torque is determined, and that between the drive device and the workpiece holder a rotationally fixed connection is made, which in a function of the maximum drive torque certain limit torque is solvable.

Vorteile und Ausgestaltungen des erfindungsgemäßen Verfahrens sind zum Teil bereits vorstehend im Zusammenhang mit den Vorteilen und Ausgestaltungen der erfindungsgemäßen Planschleifmaschine erläutert worden. Daher wird im Folgenden lediglich auf jene Vorteile und Ausgestaltungen des erfindungsgemäßen Verfahrens eingegangen, welche nicht bereits vorstehend im Zusammenhang mit den Vorteilen und Ausgestaltungen der erfindungsgemäßen Planschleifmaschine erläutert worden sind.Advantages and embodiments of the method according to the invention have in part already been explained above in connection with the advantages and refinements of the surface grinding machine according to the invention. Therefore, in the following only those advantages and embodiments of the method according to the invention will be discussed, which have not already been explained above in connection with the advantages and embodiments of the surface grinding machine according to the invention.

Durch die Ermittlung eines tatsächlich auftretenden maximalen Antriebsmoments mit Hilfe mindestens eines Probe-Werkstücks können während des regulären Betriebs der Planschleifmaschine auftretende Antriebsmomente in einfacher Weise und exakt ermittelt werden. Das Grenzdrehmoment, welches dann bei dem regulären Betrieb der Planschleifmaschine vorgegeben werden soll, wird in Abhängigkeit des tatsächlich auftretenden maximalen Antriebsdrehmoments bestimmt.By determining an actually occurring maximum drive torque with the aid of at least one sample workpiece, drive torques occurring during regular operation of the surface grinding machine can be determined in a simple manner and accurately. The limit torque, which is then to be specified in the regular operation of the surface grinding machine, is determined as a function of the actually occurring maximum drive torque.

Eine Möglichkeit zur Erfassung des tatsächlich auftretenden maximalen Antriebsmoments besteht darin, den Energiebedarf der Antriebseinrichtung zu erfassen. Beispielsweise können Spannungs- und/oder Stromwerte, mit welchen die Antriebseinrichtung betrieben wird, erfasst werden.One possibility for detecting the actually occurring maximum drive torque is to detect the energy requirement of the drive device. For example, voltage and / or current values with which the drive device is operated can be detected.

Zusätzlich oder alternativ hierzu ist es möglich, das tatsächlich auftretende maximale Antriebsdrehmoment mit einer Drehmoment-Messeinrichtung zu messen. Vorzugsweise ist eine solche Messeinrichtung in einem räumlichen Zusammenhang zu der Kupplungseinrichtung angeordnet, beispielsweise zwischen der Antriebseinrichtung und der Kupplungseinrichtung oder zwischen der Kupplungseinrichtung und dem Werkstückhalter.Additionally or alternatively, it is possible to measure the actually occurring maximum drive torque with a torque-measuring device. Preferably, such a measuring device is arranged in a spatial relationship to the coupling device, for example between the drive device and the coupling device or between the coupling device and the workpiece holder.

Bevorzugt ist es ferner, wenn das Grenzdrehmoment gleich dem maximalen Antriebsdrehmoment multipliziert mit einem Faktor von größer 1 ist. Hierdurch kann sichergestellt werden, dass geringfügige Überschreitungen des mit Hilfe des Probe-Werkstücks gemessenen maximalen Antriebsdrehmoments im regulären Betrieb der Planschleifmaschine nicht zu einem unerwünschten Lösen der Kupplungseinrichtung führen.It is also preferable if the limit torque is equal to the maximum drive torque multiplied by a factor of greater than one. In this way, it can be ensured that slight exceedances of the maximum drive torque measured with the aid of the sample workpiece do not lead to an undesirable release of the clutch device in the regular operation of the surface grinding machine.

Vorzugsweise ist das Grenzdrehmoment gleich dem maximalen Antriebsdrehmoment multipliziert mit einem Faktor von kleiner als ungefähr 1,5. Insbesondere beträgt der Faktor zwischen ungefähr 1,1 und ungefähr 1,3. Diese Faktoren bieten einen guten Kompromiss zwischen einem Überlastschutz der Bauteile der Planschleifmaschine und einem möglichst unterbrechungsfreien Betrieb.Preferably, the limit torque is equal to the maximum drive torque multiplied by a factor of less than about 1.5. In particular, the factor is between about 1.1 and about 1.3. These factors provide a good compromise between overload protection of the components of the surface grinding machine and an interruption-free operation.

Bevorzugt ist es ferner, wenn das mindestens eine Probe-Werkstück dieselbe Geometrie aufweist wie ein mittels der Planschleifmaschine planzuschleifendes unbearbeitetes Werkstück. Hierdurch kann das tatsächlich auftretende maximale Antriebsdrehmoment besonders genau ermittelt werden. In diesem Zusammenhang ist es vorteilhaft, wenn mit Hilfe von Probe-Werkstücken ermittelte maximale Antriebsdrehmomente und gegebenenfalls deren zugeordnete Grenzdrehmomente abgespeichert werden, so dass diese Werte nach einer Neueinrichtung der Planschleifmaschine bereits bekannt sind und verwendet werden können.It is furthermore preferred if the at least one sample workpiece has the same geometry as a raw workpiece that is to be flat-ground by means of the surface grinding machine. As a result, the actually occurring maximum drive torque can be determined particularly accurately. In this context, it is advantageous if maximum drive torques determined with the aid of trial workpieces and, if appropriate, their associated limit torques are stored, so that these values are already known and can be used after a new set-up of the surface grinding machine.

In vorteilhafter Weise wird das maximale Antriebsmoment bestimmt, wenn eine Eingriffsfläche zwischen dem mindestens einen Schleifwerkzeug und dem mindestens einen Probe-Werkstück maximal ist. In diesem Zustand der Planschleifmaschine sind die Reibflächen zwischen dem Werkstück und dem Schleifwerkzeug maximiert, so dass in diesem Zustand maximale Antriebsmomente auftreten. Wenn in dem Bearbeitungsbereich gleichzeitig eine Mehrzahl von Werkstücken bearbeitet wird, erhöht sich das maximale Antriebsmoment und somit das Grenzdrehmoment entsprechend.Advantageously, the maximum drive torque is determined when an engagement surface between the at least one grinding tool and the at least one sample workpiece is maximum. In this state of the surface grinding machine, the friction surfaces between the workpiece and the grinding tool are maximized, so that maximum drive torques occur in this state. If a plurality of workpieces are simultaneously machined in the processing area, the maximum drive torque and thus the limit torque increase accordingly.

Weitere Merkmale und Vorteile der Erfindung sind Gegenstand der nachfolgenden Beschreibung und der zeichnerischen Darstellung eines bevorzugten Ausführungsbeispiels.Further features and advantages of the invention are the subject of the following description and the diagrammatic representation of a preferred embodiment.

In den Zeichnungen zeigen:

Figur 1
eine Draufsicht einer Ausführungsform einer Planschleifmaschine;
Figur 2
eine Seitenansicht der Planschleifmaschine gemäß Figur 1, in welcher eine Antriebseinrichtung und eine Kupplungseinrichtung dargestellt ist; und
Figur 3
eine Seitenansicht der Kupplungseinrichtung gemäß Figur 2 längs einer in Figur 2 mit II-II bezeichneten Schnittebene.
In the drawings show:
FIG. 1
a plan view of an embodiment of a surface grinding machine;
FIG. 2
a side view of the surface grinding machine according to FIG. 1 in which a drive device and a coupling device is shown; and
FIG. 3
a side view of the coupling device according to FIG. 2 along a in FIG. 2 with II-II designated cutting plane.

Eine Ausführungsform einer in Figur 1 insgesamt mit dem Bezugszeichen 10 bezeichneten Planschleifmaschine ist als Doppelplanschleifmaschine ausgebildet und umfasst zwei Schleifscheiben, von denen in Figur 1 eine obere Schleifscheibe 12 in strichpunktierter Form angedeutet ist. Die obere Schleifscheibe 12 und die untere Schleifscheibe sind jeweils um eine Schleifscheibenachse 14 drehbar antreibbar.An embodiment of an in FIG. 1 Plane grinding machine designated overall by the reference numeral 10 is designed as a double-surface grinding machine and comprises two grinding wheels, of which in FIG. 1 an upper grinding wheel 12 is indicated in dot-dashed form. The upper grinding wheel 12 and the lower grinding wheel are each rotatably driven about a grinding wheel axis 14.

Die Planschleifmaschine 10 umfasst ferner einen scheibenförmigen Werkstückhalter 16, welcher um eine Werkstückhalterachse 18 drehbar antreibbar ist. Die Werkstückhalterachse 18 und die Schleifscheibenachse 14 sind zueinander parallel oder um wenige Grad, beispielsweise bis maximal 5°, relativ zueinander geneigt.The surface grinding machine 10 further comprises a disc-shaped workpiece holder 16 which is rotatably driven about a workpiece holder axis 18. The workpiece holder axis 18 and the grinding wheel axis 14 are mutually parallel or inclined by a few degrees, for example up to a maximum of 5 °, relative to each other.

Der Werkstückhalter 16 umfasst eine Mehrzahl von Werkstückaufnahmen 20, welche vorzugsweise in radialer Richtung relativ zu der Werkstückhalterachse 18 identisch beabstandet sind und ferner vorzugsweise in Umfangsrichtung gesehen relativ zueinander identisch beabstandet sind. Vorzugsweise weist der Werkstückhalter 16 mindestens zwei, insbesondere mindestens zehn, Werkstückaufnahmen 20 auf. Eine Werkstückaufnahme 20 kann beispielsweise durch eine lochförmige Materialaussparung gebildet sind, welche zur Aufnahme eines Werkstücks dient. In Figur 1 ist ein Werkstück 22 aus Gründen der Übersichtlichkeit schraffiert dargestellt.The workpiece holder 16 comprises a plurality of workpiece holders 20, which are preferably identically spaced in the radial direction relative to the workpiece holder axis 18 and are also preferably identically spaced relative to one another as viewed in the circumferential direction. Preferably, the workpiece holder 16 has at least two, in particular at least ten, workpiece holders 20. A workpiece holder 20 can be formed for example by a hole-shaped material recess, which serves to receive a workpiece. In FIG. 1 a workpiece 22 is shown hatched for reasons of clarity.

Die Planschleifmaschine 10 weist einen Bestückungsbereich 24 auf, in welchem unbearbeitete Werkstücke 22 in eine Werkstückaufnahme 20 eingelegt werden können. Das Einlegen kann von Hand erfolgen oder mittels einer Bestückungseinrichtung 26, welche insbesondere ein Magazin 28 zur Bevorratung von unbearbeiteten Werkstücken 22 aufweist.The surface grinding machine 10 has an assembly area 24, in which unprocessed workpieces 22 can be inserted into a workpiece holder 20. The insertion can be done by hand or by means of a loading device 26, which in particular has a magazine 28 for storing unprocessed workpieces 22.

Die Planschleifmaschine 10 umfasst ferner einen Bearbeitungsbereich 30, in welchem an dem Werkstückhalter 16 gehaltene Werkstücke 22 in planschleifendem Eingriff mit dem oberen Schleifwerkzeug 12 und mit dem unteren Schleifwerkzeug stehen.The surface grinding machine 10 further includes a machining area 30 in which workpieces 22 held on the workpiece holder 16 are in face-grinding engagement with the upper grinding tool 12 and with the lower grinding tool.

Ferner umfasst die Planschleifmaschine 10 einen Entnahmebereich 32, in welchem Werkstücke 22 aus den Werkstückaufnahmen 20 entnommen werden können.Furthermore, the surface grinding machine 10 comprises a removal region 32, in which workpieces 22 can be removed from the workpiece holders 20.

In dem Bearbeitungsbereich 30 sind das obere Schleifwerkzeug 12 und das untere Schleifwerkzeug zueinander beabstandet, so dass ein Schleifspalt entsteht, in welchem Werkstücke 22 aufgenommen und bezogen auf die Schwerkraftrichtung nach unten und nach oben abgestützt sind. Außerhalb des Bearbeitungsbereichs 30 sind die Werkstücke 22 in dem Bestückungsbereich 24 und in dem Entnahmebereich 32 nach unten hin mit Hilfe in der Zeichnung nicht dargestellter Werkstückauflagen abgestützt. Die Planschleifmaschine 10 umfasst eine Messeinrichtung 34, welche in einem Eingangsbereich des Entnahmebereichs 32 angeordnet ist. Mit Hilfe der Messeinrichtung 34 wird eine parallel zur Erstreckungsrichtung des Schleifspalts anliegende Dicke eines Werkstücks 22 gemessen.In the processing area 30, the upper grinding tool 12 and the lower grinding tool are spaced apart from each other, so that a grinding gap is formed, in which workpieces 22 are received and supported in relation to the direction of gravity down and up. Outside the processing area 30, the workpieces 22 are supported in the placement area 24 and in the removal area 32 at the bottom with the aid of workpiece supports not shown in the drawing. The surface grinding machine 10 comprises a measuring device 34, which is arranged in an input region of the removal region 32. With the aid of the measuring device 34, a parallel to the extension direction of the grinding gap applied thickness of a workpiece 22 is measured.

Die Planschleifmaschine 10 weist an den Bearbeitungsbereich 30 angrenzend eine erste Führungseinrichtung 36 im Bereich eines Einlaufs des Bearbeitungsbereichs 30 und eine zweite Führungseinrichtung 38 im Bereich eines Auslaufs des Bearbeitungsbereichs 30 auf. Die Führungseinrichtungen 36 und 38 weisen jeweils ein plattenförmiges Führungselement 40, 42 auf, welches eine dem Werkstückhalter 16 zugewandte Führungsfläche 44 beziehungsweise 46 aufweist. Die Führungsflächen 44, 46 sind jeweils mit einer Berandung 48 beziehungsweise 50 versehen.The surface grinding machine 10 has, adjacent to the processing area 30, a first guide device 36 in the region of an inlet of the processing area 30 and a second guide device 38 in the area of an outlet of the processing area 30. The guide devices 36 and 38 each have a plate-shaped guide element 40, 42 which has a guide surface 44 or 46 facing the workpiece holder 16. The guide surfaces 44, 46 are each provided with a boundary 48 or 50.

Mit Hilfe des Führungselements 40 der ersten Führungseinrichtung 36 können unbearbeitete Werkstücke 22 bezogen auf die Schwerkraftrichtung nach unten gegen eine nicht dargestellte Werkstückauflage gedrückt werden, so dass ein Werkstück bezogen auf die Schwerkraftrichtung exakt relativ zu dem Schleifspalt zwischen dem oberen Schleifwerkzeug 12 und dem unteren Schleifwerkzeug ausgerichtet werden kann. In entsprechender Weise kann mit Hilfe des Führungselements 42 der zweiten Führungseinrichtung 38 ein bearbeitetes Werkstück 22 aus dem Bearbeitungsbereich 30 herausgeführt werden.With the help of the guide member 40 of the first guide means 36 unprocessed workpieces 22 can be pressed down against a workpiece support, not shown, with respect to the direction of gravity so that a workpiece relative to the direction of gravity exactly aligned relative to the grinding gap between the upper grinding tool 12 and the lower grinding tool can be. In a corresponding manner, a machined workpiece 22 can be guided out of the processing area 30 with the aid of the guide element 42 of the second guide device 38.

Die Planschleifmaschine 10 weist ferner in dem Entnahmebereich 32 eine Werkstückabführung 52 auf, welche insbesondere in Form einer Rutsche ausgebildet ist. Über die Werkstückabführung 52 können an dem Werkstückhalter 16 gehaltene, fertig bearbeitete Werkstücke 22 nach unten hin aus den Werkstückaufnahmen 20 entfernt und abgeführt werden.The surface grinding machine 10 further has in the removal region 32 on a workpiece removal 52, which is formed in particular in the form of a chute. About the workpiece removal 52 held on the workpiece holder 16, finished machined workpieces 22 downwards removed from the workpiece holders 20 and removed.

Zum Antrieb des Werkstückhalters 16 um die Werkstückhalterachse 18 in einer Drehrichtung 54 ist eine Antriebseinrichtung 56 vorgesehen, welche insbesondere in Form eines Elektromotors ausgebildet ist.For driving the workpiece holder 16 about the workpiece holder axis 18 in a direction of rotation 54, a drive device 56 is provided, which is designed in particular in the form of an electric motor.

Die Antriebseinrichtung 56 wirkt nicht unmittelbar auf den Werkstückhalter 16, sondern unter Zwischenschaltung einer Kupplungseinrichtung 58. Die Kupplungseinrichtung 58 stellt in einem eingekuppelten Zustand eine drehfeste Verbindung zwischen der Antriebseinrichtung 56 und dem Werkstückhalter 16 her. In Abhängigkeit eines vorgebbaren Grenzdrehmoments wird die drehfeste Verbindung der Kupplungseinrichtung 58 gelöst.The drive device 56 does not act directly on the workpiece holder 16, but with the interposition of a coupling device 58. The coupling device 58 establishes a rotationally fixed connection between the drive device 56 and the workpiece holder 16 in an engaged state. Depending on a predefinable limit torque, the rotationally fixed connection of the coupling device 58 is released.

Das Grenzdrehmoment der Kupplungseinrichtung 58 wird mit Hilfe einer Steuereinrichtung 60 gesteuert, welche vorzugsweise zur Vorgabe eines Energiebedarfs der Antriebseinrichtung 56 auch mit der Antriebseinrichtung 56 kommuniziert.The limit torque of the clutch device 58 is controlled by means of a control device 60, which preferably also communicates with the drive device 56 for prescribing an energy requirement of the drive device 56.

Die Kupplungseinrichtung 58 ist vorzugsweise in Form einer elektromagnetischen Kupplung 62 ausgebildet, welche in Figur 3 detaillierter dargestellt ist.The coupling device 58 is preferably in the form of an electromagnetic clutch 62, which in FIG. 3 is shown in more detail.

Ein Eingangsdrehmoment der Antriebseinrichtung 56 wird mit Hilfe einer Eingangswelle 64 auf einen Reibbelagträger 66 übertragen. Der Reibbelagträger 66 weist eine Reibbelagaufnahme 68 auf, in welchem ein insbesondere ringförmiger Reibbelag 70 aufgenommen ist. Der Reibbelag 70 ist bezogen auf die Werkstückhalterachse 18 in axialer Richtung bewegbar. Der Reibbelag 70 weist an seiner Umfangsfläche eine Verzahnung 72 auf, welche eine in Drehrichtung formschlüssige Verbindung mit einer entsprechenden Verzahnung der Reibbelagaufnahme 68 herstellt.An input torque of the drive device 56 is transmitted to a friction lining carrier 66 by means of an input shaft 64. The Reibbelagträger 66 has a Reibbelagaufnahme 68, in which a particular annular friction lining 70 is received. The friction lining 70 is movable relative to the workpiece holder axis 18 in the axial direction. The friction lining 70 has on its peripheral surface a toothing 72 which has a in Direction of rotation produces a positive connection with a corresponding toothing of the friction lining receptacle 68.

Der Reibbelag 70 ist magnetisierbar, so dass er von einem ringförmigen Elektromagneten 74 angezogen werden kann. Der Elektromagnet 74 ist drehfest mit einem Elektromagnethalter 76 verbunden, in welchen eine nicht weiter dargestellte Spule integriert ist, welche mit Hilfe eines Anschlusses 78 bestromt werden kann. Bei Bestromung der Spule erzeugt der Elektromagnet 74 ein Magnetfeld, welches den Reibbelag 70 gegen den Elektromagneten 74 drückt, so dass ein Reibschluss zwischen diesen Partnern entsteht. Die Stärke des Reibschlusses ist abhängig von der Bestromung des Elektromagneten 74, welche mittels der Steuereinrichtung 60 vorgegeben wird.The friction lining 70 is magnetizable, so that it can be attracted by an annular electromagnet 74. The solenoid 74 is rotatably connected to a solenoid holder 76, in which a coil, not shown, is integrated, which can be energized by means of a terminal 78. When energizing the coil, the electromagnet 74 generates a magnetic field, which presses the friction lining 70 against the electromagnet 74, so that a frictional engagement between these partners arises. The strength of the frictional connection is dependent on the energization of the electromagnet 74, which is predetermined by means of the control device 60.

Der Magnetträger 76 ist drehfest mit einer Ausgangswelle 80 verbunden, welche über Wälzlager 82 drehbar in einem ortsfesten Gehäuse 84 gelagert ist.The magnet carrier 76 is non-rotatably connected to an output shaft 80, which is rotatably mounted in a stationary housing 84 via roller bearings 82.

Die Ausgangswelle 80 ist an ihrem der Kupplungseinrichtung 58 abgewandten Ende mit einem Werkstückhalterauflager 86 drehfest verbunden. Ferner ist das genannte Ende der Ausgangswelle 80 mit einem Bolzen 88 verbunden, welcher eine zentrische Aussparung des Werkstückhalters 16 durchdringt. Dieser wirkt mit einer Spannhülse 90 zusammen, mit welchem eine Spannglocke 92 von oben her auf den Werkstückhalter 16 gedrückt werden kann.The output shaft 80 is rotatably connected at its end facing away from the coupling device 58 with a Werkstückhalterauflager 86. Furthermore, the said end of the output shaft 80 is connected to a bolt 88, which penetrates a central recess of the workpiece holder 16. This cooperates with a clamping sleeve 90, with which a clamping bell 92 can be pressed from above onto the workpiece holder 16.

Zwischen dem Werkstückhalterauflager 86 und der unteren Seite des Werkstückhalters 16 sind ringförmige Distanzelemente 94 angeordnet, welche ein Anpassen an unterschiedliche Dicken unterschiedlicher Werkstückhalter 16 ermöglichen.Between the Werkstückhalterauflager 86 and the lower side of the workpiece holder 16 annular spacers 94 are arranged, which allow adaptation to different thicknesses of different workpiece holder 16.

Der Werkstückhalter 16 ist zwischen den Distanzelementen 94 und der Spannglocke 92 drehfest fixiert.The workpiece holder 16 is fixed against rotation between the spacer elements 94 and the clamping bell 92.

Zum Einrichten der Planschleifmaschine 10 können beispielsweise acht Probe-Werkstücke verwendet werden, welche in den Bearbeitungsbereich 30 eingebracht werden, so dass diese gleichzeitig in Eingriff mit dem oberen Schleifwerkzeug 12 und dem unteren Schleifwerkzeug stehen. Für einen Transport der Probe-Werkstücke ist ein Antriebsmoment der Antriebseinrichtung 56 erforderlich, welches mit dem Energiebedarf der Antriebseinrichtung 56 korreliert. Hieraus kann ein tatsächlich auftretendes maximales Antriebsmoment ermittelt werden, welches dann mit einem Faktor von beispielsweise zwischen ungefähr 1,1 und ungefähr 1,3 multipliziert wird. Hierdurch ergibt sich ein Grenzdrehmoment, welches mit Hilfe der Steuereinrichtung 60 an der Kupplungseinrichtung 58 durch entsprechende Bestromung des Elektromagneten 74 eingestellt werden kann.To set up the surface grinding machine 10, for example, eight sample workpieces can be used, which are introduced into the processing area 30, so that they are simultaneously in engagement with the upper grinding tool 12 and the lower grinding tool. For a transport of the sample workpieces, a drive torque of the drive device 56 is required, which correlates with the energy requirement of the drive device 56. From this, an actually occurring maximum drive torque can be determined, which is then multiplied by a factor of, for example, between about 1.1 and about 1.3. This results in a limit torque, which can be adjusted by means of the control device 60 on the coupling device 58 by appropriate energization of the electromagnet 74.

Anschließend können unbearbeitete Werkstücke 22 aus der Bestückungseinrichtung 28 heraus dem Werkstückhalter 16 zugeführt und in den Bearbeitungsbereich 30 eingeführt werden. Nach Bearbeitung der Werkstücke werden diese durch weitere Bewegung des Werkstückhalters 16 in Drehrichtung 54 aus dem Bearbeitungsbereich 30 herausgeführt, so dass sie in dem Entnahmebereich 32 von dem Werkstückhalter 16 entfernt werden können.Subsequently, unprocessed workpieces 22 can be fed out of the loading device 28 out of the workpiece holder 16 and introduced into the processing region 30. After processing of the workpieces, these are brought out of the processing area 30 in the direction of rotation 54 by further movement of the workpiece holder 16 so that they can be removed from the workpiece holder 16 in the removal area 32.

Es ist möglich, dass der Werkstückhalter 16 schrittweise betrieben wird oder kontinuierlich rotiert.It is possible that the workpiece holder 16 is operated stepwise or continuously rotated.

Wenn während des Betriebs der Planschleifmaschine 10 ein Werkstück 22 verkantet, beispielsweise im Bereich des Ausgangs des Magazins 28 in Richtung auf den Werkstückhalter 16 oder im Bereich der Berandung 48 der ersten Führungseinrichtung 36 oder im Bereich der Berandung 50 der zweiten Führungseinrichtung 38, bewirkt dies eine Überschreitung des Grenzdrehmoments, wodurch die drehfeste Verbindung der Kupplungseinrichtung 58 zwischen der Antriebseinrichtung 56 und dem Werkstückhalter 16 gelöst wird, indem der Reibbelag 70 auf dem Elektromagneten 74 abrutscht.If, during operation of the surface grinding machine 10, a workpiece 22 canted, for example, in the region of the exit of the magazine 28 in the direction of the Workpiece holder 16 or in the region of the boundary 48 of the first guide means 36 or in the region of the boundary 50 of the second guide means 38, this causes an exceeding of the limit torque, whereby the rotationally fixed connection of the coupling means 58 between the drive means 56 and the workpiece holder 16 is released by the Friction lining 70 slips on the electromagnet 74.

Die vorstehend beschriebene Möglichkeit des Verkantens eines Werkstücks 22 ist nicht nur dadurch begründet, dass möglicherweise Teile der Planschleifmaschine 10 nicht exakt eingerichtet wurden, sondern auch dadurch, dass Werkstücke 22 in dem Bearbeitungsbereich 30 durch Einsatz von Kühlflüssigkeit aufschwimmen, so dass diese mit den Berandungen 48, 50 oder mit einer Berandung der Schleifwerkzeuge kollidieren.The above-described possibility of tilting a workpiece 22 is due not only to the fact that possibly parts of the surface grinding machine 10 were not set up exactly, but also in that workpieces 22 float in the processing area 30 by the use of cooling liquid, so that it with the boundaries 48 , 50 or collide with a boundary of the grinding tools.

Bei einer alternativen, in der Zeichnung nicht dargestellten Ausführungsform ist die Kupplungseinrichtung 58 bezogen auf den Werkstückhalter 16 auf einer der Antriebseinrichtung 56 abgewandten Seite angeordnet, beispielsweise zwischen der Spannhülse 90 und der Spannglocke 92.In an alternative embodiment, not shown in the drawing, the coupling device 58 is arranged with respect to the workpiece holder 16 on a side facing away from the drive means 56, for example between the clamping sleeve 90 and the clamping bell 92nd

Claims (12)

Planschleifmaschine (10), umfassend mindestens ein Schleifwerkzeug (12), einen Werkstückhalter (16) zum Halten mindestens eines Werkstücks (22), und eine Antriebseinrichtung (56) zum Antreiben des Werkstückhalters (16) in einer Drehrichtung (54), gekennzeichnet durch eine Kupplungseinrichtung (58), welche zwischen der Antriebseinrichtung (56) und dem Werkstückhalter (16) eine drehfeste Verbindung bereitstellt, die bei einem vorgebbaren Grenzdrehmoment lösbar ist.A surface grinding machine (10) comprising at least one grinding tool (12), a workpiece holder (16) for holding at least one workpiece (22), and a drive means (56) for driving the workpiece holder (16) in a rotational direction (54), characterized by a Coupling device (58), which between the drive device (56) and the workpiece holder (16) provides a rotationally fixed connection, which is releasable at a predetermined limit torque. Planschleifmaschine (10) nach Anspruch 1, gekennzeichnet durch eine Steuereinrichtung (60), welche in Abhängigkeit eines tatsächlich auftretenden maximalen Antriebsmoments das Grenzdrehmoment der Kupplungseinrichtung (58) einstellt.Surface grinding machine (10) according to claim 1, characterized by a control device (60) which adjusts the limit torque of the clutch device (58) as a function of an actually occurring maximum drive torque. Planschleifmaschine (10) nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, dass die Kupplungseinrichtung (58) in Form einer elektromagnetischen Kupplung (62) ausgebildet ist.Surface grinding machine (10) according to one of the preceding claims, characterized in that the coupling device (58) in the form of an electromagnetic clutch (62) is formed. Planschleifmaschine (10) nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, dass die drehfeste Verbindung eine reibschlüssige Verbindung ist.Surface grinding machine (10) according to one of the preceding claims, characterized in that the rotationally fixed connection is a frictional connection. Planschleifmaschine (10) nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, dass die Planschleifmaschine (10) als Doppelplanschleifmaschine ausgebildet ist.Surface grinding machine (10) according to one of the preceding claims, characterized in that the surface grinding machine (10) is designed as a double-plan grinding machine. Verfahren zur Einrichtung einer Planschleifmaschine (10), wobei die Planschleifmaschine (10) mindestens ein Schleifwerkzeug (12), einen Werkstückhalter (16) zum Halten mindestens eines Werkstücks (22) und eine Antriebseinrichtung (56) zum Antreiben des Werkstückhalters (16) in einer Drehrichtung umfasst, dadurch gekennzeichnet, dass während der schleifenden Bearbeitung mindestens eines Probe-Werkstücks ein tatsächlich auftretendes maximales Antriebsdrehmoment ermittelt wird, und dass zwischen der Antriebseinrichtung (56) und dem Werkstückhalter (16) eine drehfeste Verbindung hergestellt wird, die bei einem in Abhängigkeit des maximalen Antriebsdrehmoments bestimmten Grenzdrehmoment lösbar ist.Method for setting up a surface grinding machine (10), wherein the surface grinding machine (10) has at least one grinding tool (12), a workpiece holder (16) for holding at least one workpiece (22) and a drive device (56) for driving the workpiece holder (16) in a rotational direction, characterized in that during the grinding processing of at least one sample workpiece actually occurring maximum drive torque is determined, and that between the drive device (56) and the workpiece holder (16) is a rotationally fixed connection is made, which is releasable at a determined in dependence on the maximum drive torque limit torque. Verfahren nach Anspruch 6, dadurch gekennzeichnet, dass das tatsächlich auftretende maximale Antriebsmoment ermittelt wird durch Erfassung eines Energiebedarfs der Antriebseinrichtung (56).A method according to claim 6, characterized in that the actually occurring maximum drive torque is determined by detecting an energy demand of the drive means (56). Verfahren nach Anspruch 6 oder 7, dadurch gekennzeichnet, dass das tatsächlich auftretende maximale Antriebsdrehmoment mit einer Drehmoment-Messeinrichtung gemessen wird.A method according to claim 6 or 7, characterized in that the actually occurring maximum drive torque is measured with a torque-measuring device. Verfahren nach einem der Ansprüche 6 bis 8, dadurch gekennzeichnet, dass das Grenzdrehmoment gleich dem maximalen Antriebsdrehmoment multipliziert mit einem Faktor von größer 1 ist.Method according to one of claims 6 to 8, characterized in that the limit torque is equal to the maximum drive torque multiplied by a factor of greater than 1. Verfahren nach einem der Ansprüche 6 bis 9, dadurch gekennzeichnet, dass das Grenzdrehmoment gleich dem maximalen Antriebsdrehmoment multipliziert mit einem Faktor von kleiner als ungefähr 1,5 ist.Method according to one of claims 6 to 9, characterized in that the limit torque is equal to the maximum drive torque multiplied by a factor of less than about 1.5. Verfahren nach einem der Ansprüche 6 bis 10, dadurch gekennzeichnet, dass das mindestens eine Probe-Werkstück dieselbe Geometrie aufweist wie ein mittels der Planschleifmaschine planzuschleifendes unbearbeitetes Werkstück (22).Method according to one of claims 6 to 10, characterized in that the at least one sample workpiece has the same geometry as a means the plan grinder plane grinding workpiece unprocessed workpiece (22). Verfahren nach einem der Ansprüche 6 bis 11, dadurch gekennzeichnet, dass das maximale Antriebsmoment bestimmt wird, wenn eine Eingriffsfläche zwischen dem mindestens einen Schleifwerkzeug (12) und dem mindestens einen Probe-Werkstück maximal ist.Method according to one of claims 6 to 11, characterized in that the maximum drive torque is determined when an engagement surface between the at least one grinding tool (12) and the at least one sample workpiece is maximum.
EP09007669A 2009-06-10 2009-06-10 Surface grinding machine and device for setting up same Not-in-force EP2260976B1 (en)

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EP09007669A EP2260976B1 (en) 2009-06-10 2009-06-10 Surface grinding machine and device for setting up same
AT09007669T ATE519566T1 (en) 2009-06-10 2009-06-10 FACE GRINDING MACHINE AND METHOD FOR SETTING UP A FACE GRINDING MACHINE
CN2010102029171A CN102029556A (en) 2009-06-10 2010-06-10 Surface grinding machine and method for setting up the same

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US3827260A (en) * 1971-09-25 1974-08-06 T Kato Shaft-coupling device preventable from over-torque transmission
DE4344817A1 (en) * 1993-12-28 1995-06-29 Hilti Ag Method and device for hand-held machine tools to avoid accidents due to tool blocking
EP0694706A1 (en) * 1994-07-25 1996-01-31 HILTI Aktiengesellschaft Adaptive overload coupling
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CN102229106B (en) * 2011-07-11 2012-11-14 湖南宇环同心数控机床有限公司 Multi-axis driving device for double-faced grinding machine

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