EP2517839A2 - Machine tool and control method - Google Patents

Machine tool and control method Download PDF

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Publication number
EP2517839A2
EP2517839A2 EP20120155287 EP12155287A EP2517839A2 EP 2517839 A2 EP2517839 A2 EP 2517839A2 EP 20120155287 EP20120155287 EP 20120155287 EP 12155287 A EP12155287 A EP 12155287A EP 2517839 A2 EP2517839 A2 EP 2517839A2
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EP
European Patent Office
Prior art keywords
motor
rotation
tool
machine tool
duration
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
EP20120155287
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German (de)
French (fr)
Other versions
EP2517839B1 (en
EP2517839A3 (en
Inventor
Thomas Müller
Germar Meiendres
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Hilti AG
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Hilti AG
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Publication of EP2517839A2 publication Critical patent/EP2517839A2/en
Publication of EP2517839A3 publication Critical patent/EP2517839A3/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D11/00—Portable percussive tools with electromotor or other motor drive
    • B25D11/06—Means for driving the impulse member
    • B25D11/12—Means for driving the impulse member comprising a crank mechanism
    • B25D11/125—Means for driving the impulse member comprising a crank mechanism with a fluid cushion between the crank drive and the striking body
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D16/00—Portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2216/00—Details of portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B25D2216/0007—Details of percussion or rotation modes
    • B25D2216/0015—Tools having a percussion-only mode
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2216/00—Details of portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B25D2216/0007—Details of percussion or rotation modes
    • B25D2216/0023—Tools having a percussion-and-rotation mode
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2216/00—Details of portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B25D2216/0007—Details of percussion or rotation modes
    • B25D2216/0038—Tools having a rotation-only mode
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/221—Sensors

Definitions

  • the machine tool control method of the present invention first rotates the motor for a duration of less than 100 ms in a first direction of rotation and then in a second direction of rotation opposite the first direction of rotation, in response to actuation of a system button to start a motor. With the motor rotating in the second direction of rotation, a tool is rotated by the machine tool in a direction of rotation corresponding to its function.
  • Fig. 1 schematically shows a hammer drill 1 as an example of a hand tool.
  • the hammer drill 1 has a tool holder 2 , in which a shank end 3 of a tool, for example one of the drill bit 4 , can be used.
  • a primary drive of the hammer drill 1 is a motor 5 , which drives a percussion 6 and a hollow output shaft 7 .
  • a user can guide the hammer drill 1 by means of a handle 8 and take means of a system key 9 the hammer drill 1 is in operation.
  • the hammer drill 1 rotates the drill bit 4 continuously about a working axis 10 and can beat the drill bit 4 in the direction of impact 11 along the working axis 10 in a substrate.
  • a selector switch may be provided for actuation by a user, which allows a choice between at least two of the following modes: turning and hitting, turning only and hitting only.
  • the powertrain between the engine 5 and the hollow output shaft 7 may include a transmission 18 to adjust a rotational speed of the engine 5 to a desired rotational speed of the tool 4 .
  • An overload clutch 19 may decouple the engine 5 from the output shaft 7 when a torque acting back from the tool 4 exceeds a tripping torque of the overload clutch 19 .
  • An exemplary overload clutch 19 may have a hollow bevel gear 20 which is mounted axially displaceably on the output shaft 7 and rotatably engages eg via balls 21 in the output shaft 7 .
  • An axially acting spring 22 presses the bevel gear 20 into engagement with an output pinion 23 of the transmission. If the retroactive torque exceeds a threshold value, the bevel gear 20 is deflected axially against the spring 22 and disengages from the output pinion 23 .
  • the system button 9 is coupled to the engine controller 24 . As soon as a user actuates the system button 9 , the motor control 24 is activated.
  • the engine controller 24 preferably first determines a rotational speed of the engine 25 . If the motor 25 is stopped or the speed falls below a threshold value, a start-up control is activated. In the startup control, the motor 5 is initially rotated in a direction of rotation reversed for the application of the hammer drill 1 .
  • Commercially available drills have a drilling action only in a given direction of rotation, namely in a clockwise direction on the drill bit. Furthermore, the conveying effect of a helix is designed for this direction of rotation.
  • the wrong direction of rotation of the motor 5 is characterized in that the drill 4 is rotated counterclockwise.
  • the motor controller 24 may rotate the motor 5 in the reverse direction with reduced power consumption.
  • a power consumption is preferably in the range of 10% to 50% of a nominal power consumption of the motor 5 .
  • the amplitude of the currents which are fed into the magnet coils is limited by the motor controller 24 .
  • the current limitation can be done, for example, in the time average by a pulse width modulation.
  • the torque output by the motor 5 is reduced in accordance with the reduced power consumption against a torque that the motor 5 can output at the maximum nominal power consumption. Subsequent to the end of the duration, the motor controller 24 controls the motor 5 according to the correct direction of rotation for the application of the hammer drill 1 .
  • the motor controller 24 increases the power consumption of the motor 5 to the nominal power consumption for the second direction of rotation in order to provide the user with a high torque for working with the machine tool.
  • the motor controller 24 stops driving the motor 5 .
  • the motor controller 24 interrupts a power supply to all solenoid coils, whereby the motor 5 expires.
  • Other variants see an active braking of the motor 5, for example by shorting the solenoid coils or by driving the magnetic coils, such that a counter-torque for braking the motor 5 is generated to a standstill.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Control Of Electric Motors In General (AREA)
  • Automatic Tool Replacement In Machine Tools (AREA)

Abstract

The tool i.e. hammer drill (1), has a tool retainer (2) retaining a tool i.e. drill bit (4), and a motor (5) e.g. brushless electric motor, comprising a stator. A drive train has a transmission between the motor and an output shaft (7). The drive train couples the motor with the retainer for transmitting torque. A system pushbutton (9) is activated by a user such that a motor-actuated control (24) starts turning the motor for duration in a rotational direction and in another rotational direction opposite to the former direction, where the duration is shorter than 100 milliseconds. An independent claim is also included for a method for controlling a machine tool.

Description

GEBIET DER ERFINDUNGFIELD OF THE INVENTION

Die vorliegende Erfindung betrifft eine Werkzeugmaschine, insbesondere eine tragbare bohrende Werkzeugmaschine gleich einer tragbaren Bohrmaschine, einem Bohrhammer, etc. Ferner betrifft die vorliegende Erfindung ein Steuerungsverfahren für die Werkzeugmaschine, insbesondere ein Steuerungsverfahren zum Einschalten oder Aktivieren der Werkzeugmaschine.The present invention relates to a machine tool, in particular a portable drilling machine tool similar to a portable drill, a hammer drill, etc. Furthermore, the present invention relates to a control method for the machine tool, in particular a control method for switching on or activating the machine tool.

OFFENBARUNG DER ERFINDUNGDISCLOSURE OF THE INVENTION

Eine erfindungsgemäße Werkzeugmaschine hat eine Werkzeugaufnahme zum Aufnehmen eines Werkzeugs, ein Motor und einen Antriebsstrang, der den Motor mit der Werkzeugaufnahme zum Übertragen eines Drehmoments koppelt. Ein Systemtaster ist mit einer Motorsteuerung gekoppelt. Auf eine Betätigung des Systemtasters durch einen Anwender steuert die Motorsteuerung, den Motor derart, dass der Motor sich für eine Dauer in einem ersten Drehsinn und anschließend in einem dem ersten Drehsinn entgegengesetzten Drehsinn dreht. Die Dauer ist kürzer als 100 ms.A machine tool according to the invention has a tool holder for receiving a tool, a motor and a drive train, which couples the motor with the tool holder for transmitting a torque. A system button is coupled to a motor controller. Upon actuation of the system button by a user, the motor controller controls the motor so that the motor rotates for a duration in a first direction of rotation and then in a direction opposite to the first direction of rotation. The duration is shorter than 100 ms.

Das erfindungsgemäße Steuerungsverfahren für eine Werkzeugmaschine dreht ansprechend auf ein Betätigen eines Systemtasters zur Inbetriebnahme eines Motors zuerst den Motor für eine Dauer von weniger als 100 ms in einem ersten Drehsinn und anschließend in einem dem ersten Drehsinn entgegengesetzten zweiten Drehsinn. Mit dem im zweiten Drehsinn drehenden Motor wird ein Werkzeug in einem seiner Funktion entsprechenden Drehsinn durch die Werkzeugmaschine gedreht.The machine tool control method of the present invention first rotates the motor for a duration of less than 100 ms in a first direction of rotation and then in a second direction of rotation opposite the first direction of rotation, in response to actuation of a system button to start a motor. With the motor rotating in the second direction of rotation, a tool is rotated by the machine tool in a direction of rotation corresponding to its function.

KURZE BESCHREIBUNG DER FIGURENBRIEF DESCRIPTION OF THE FIGURES

Die nachfolgende Beschreibung erläutert die Erfindung anhand von exemplarischen Ausführungsformen und Figuren. In den Figuren zeigen:

Fig. 1
eine Handwerkzeugmaschine
The following description explains the invention with reference to exemplary embodiments and figures. In the figures show:
Fig. 1
a hand tool

AUSFÜHRUNGSFORMEN DER ERFINDUNGEMBODIMENTS OF THE INVENTION

Fig. 1 zeigt als Beispiel einer Handwerkzeugmaschine schematisch einen Bohrhammer 1. Der Bohrhammer 1 hat eine Werkzeugaufnahme 2, in welche ein Schaftende 3 eines Werkzeug, z.B. eines des Bohrmeißels 4, eingesetzt werden kann. Einen primären Antrieb des Bohrhammers 1 bildet ein Motor 5, welcher ein Schlagwerk 6 und eine hohle Abtriebswelle 7 antreibt. Ein Anwender kann den Bohrhammer 1 mittels eines Handgriffs 8 führen und mittels eines Systemtasters 9 den Bohrhammer 1 in Betrieb nehmen. Im Betrieb dreht der Bohrhammer 1 den Bohrmeißel 4 kontinuierlich um eine Arbeitsachse 10 und kann dabei den Bohrmeißel 4 in Schlagrichtung 11 längs der Arbeitsachse 10 in einen Untergrund schlagen. In einer Ausführung kann ein Wahlschalter zur Betätigung durch einen Anwender vorgesehen sein, welcher eine Wahl zwischen wenigstens zwei der folgenden Modi ermöglicht: Drehen und Schlagen, nur Drehen und nur Schlagen. Fig. 1 schematically shows a hammer drill 1 as an example of a hand tool. The hammer drill 1 has a tool holder 2 , in which a shank end 3 of a tool, for example one of the drill bit 4 , can be used. A primary drive of the hammer drill 1 is a motor 5 , which drives a percussion 6 and a hollow output shaft 7 . A user can guide the hammer drill 1 by means of a handle 8 and take means of a system key 9 the hammer drill 1 is in operation. In operation, the hammer drill 1 rotates the drill bit 4 continuously about a working axis 10 and can beat the drill bit 4 in the direction of impact 11 along the working axis 10 in a substrate. In one embodiment, a selector switch may be provided for actuation by a user, which allows a choice between at least two of the following modes: turning and hitting, turning only and hitting only.

Das Schlagwerk 6 ist beispielsweise ein pneumatisches Schlagwerk 6. Ein Erreger 12 und ein Schläger 13 sind in dem Schlagwerk 6 längs der Arbeitsachse 10 beweglich geführt. Der Erreger 12 ist über einen Exzenter 14 oder einen Taumelfinger an den Motor 5 angekoppelt und zu einer periodischen, linearen Bewegung gezwungen. Eine Luftfeder gebildet durch eine pneumatische Kammer 15 zwischen Erreger 12 und Schläger 13 koppelt eine Bewegung des Schlägers 13 an die Bewegung des Erregers 12 an. Der Schläger 13 kann direkt auf ein hinteres Ende des Bohrmeißels 4 aufschlagen oder mittelbar über einen im Wesentlichen ruhenden Zwischenschläger 16 einen Teil seines Impuls auf den Bohrmeißel 4 übertragen. Das Schlagwerk 6 und vorzugsweise die weiteren Antriebskomponenten sind innerhalb eines Maschinengehäuses 17 angeordnet.The striking mechanism 6 is, for example, a pneumatic impact mechanism 6 . An exciter 12 and a racket 13 are movably guided in the striking mechanism 6 along the working axis 10 . The exciter 12 is coupled via an eccentric 14 or a wobble finger to the motor 5 and forced to a periodic, linear movement. An air spring formed by a pneumatic chamber 15 between exciter 12 and racket 13 couples a movement of the racket 13 to the movement of the exciter 12 at. The racket 13 can strike directly on a rear end of the drill bit 4 or indirectly transfer part of its pulse to the drill bit 4 via a substantially resting intermediate racket 16 . The striking mechanism 6 and preferably the further drive components are arranged within a machine housing 17 .

Der Antriebsstrang zwischen dem Motor 5 und der hohlen Abtriebswelle 7 kann ein Getriebe 18 enthalten, um eine Drehzahl des Motors 5 an eine gewünschte Drehzahl des Werkzeugs 4 anzupassen. Eine Überlastkupplung 19 kann den Motor 5 von der Abtriebswelle 7 entkoppeln, wenn ein von dem Werkzeug 4 rückwirkendes Drehmoment ein Auslösedrehmoment der Überlastkupplung 19 übersteigt. Eine beispielhafte Überlastkupplung 19 kann ein hohles Kegelzahnrad 20 aufweisen, das axial verschieblich auf der Abtriebswelle 7 gelagert ist und drehfest z.B. über Kugeln 21 in die Abtriebswelle 7 eingreift. Eine axial wirkende Feder 22 drückt das Kegelzahnrad 20 in Eingriff mit einem Abtriebsritzel 23 des Getriebes. Übersteigt das rückwirkende Drehmoment einen Schwellwert, wird das Kegelzahnrad 20 gegen die Feder 22 axial ausgelenkt und gelangt außer Eingriff von dem Abtriebsritzel 23.The powertrain between the engine 5 and the hollow output shaft 7 may include a transmission 18 to adjust a rotational speed of the engine 5 to a desired rotational speed of the tool 4 . An overload clutch 19 may decouple the engine 5 from the output shaft 7 when a torque acting back from the tool 4 exceeds a tripping torque of the overload clutch 19 . An exemplary overload clutch 19 may have a hollow bevel gear 20 which is mounted axially displaceably on the output shaft 7 and rotatably engages eg via balls 21 in the output shaft 7 . An axially acting spring 22 presses the bevel gear 20 into engagement with an output pinion 23 of the transmission. If the retroactive torque exceeds a threshold value, the bevel gear 20 is deflected axially against the spring 22 and disengages from the output pinion 23 .

Der Motor 5 ist vorzugsweise ein bürstenloser Elektromotor. Ein Stator des Elektromotors hat mehrere Magnetspulen, welche individuell und unabhängig voneinander von einem Strom durchflossen sind. Eine Konfiguration eines Motors 5 hat drei Magnetspulen, welche um 120 Grad zueinander um eine Motorachse versetzt sind. Sensoren an dem Motor 5 können eine aktuelle Winkelposition eines Rotors erfassen und der Motorsteuerung 24 übermitteln. Die Motorsteuerung 24 stellt ansprechend auf die erfasste Winkelposition die Amplitude des Stroms für jede der Magnetspulen ein. Beispielsweise sind zwei der Magnetspulen in entgegengesetztem Umlaufsinn stromdurchflossen, während eine Dritte der Magnetspulen stromfrei ist. Die Amplitude kann ferner in Abhängigkeit einer gewünschten Drehzahl des Motors 5 eingestellt oder ausgeregelt werden.The motor 5 is preferably a brushless electric motor. A stator of the electric motor has a plurality of magnetic coils, which are individually and independently flowed through by a current. A configuration of a motor 5 has three solenoids which are offset by 120 degrees from one another about a motor axis. Sensors on the motor 5 can detect a current angular position of a rotor and transmit it to the motor controller 24 . The motor controller 24 adjusts the amplitude of the current for each of the solenoid coils in response to the detected angular position. For example, two of the magnetic coils are flowed through in the opposite direction of rotation, while a third of the magnetic coils is de-energized. The amplitude can also be adjusted or adjusted depending on a desired speed of the motor 5 .

Der Systemtaster 9 ist mit der Motorsteuerung 24 gekoppelt. Sobald ein Anwender den Systemtaster 9 betätigt, wird die Motorsteuerung 24 aktiviert. Die Motorsteuerung 24 ermittelt vorzugsweise zuerst eine Drehzahl des Motors 25. Falls der Motor 25 steht, oder die Drehzahl einen Schwellwert unterschreitet, wird eine Anlaufsteuerung aktiviert. Bei der Anlaufsteuerung wird der Motor 5 anfänglich in einem für die Anwendung des Bohrhammers 1 verkehrten Drehsinn gedreht. Handelsübliche Bohrer haben nur bei einem vorgegebenen Drehsinn, nämlich bei einem auf die Bohrspitze im Uhrzeigersinn, eine Bohrwirkung. Ferner ist die Förderwirkung einer Wendel auf diesen Drehsinn ausgelegt. Der verkehrte Drehsinn des Motors 5 zeichnet sich dadurch aus, dass der Bohrer 4 gegen den Uhrzeigersinn gedreht wird. Der Motor 5 wird für eine kurze Dauer, von vorzugsweise weniger als 100 ms, z.B. weniger als 50 ms, und wenigstens 10 ms, z.B. wenigstens 20 ms, verkehrt herum gedreht. Die Dauer ist vorzugsweise so kurz gewählt, dass aufgrund des Spiels in Getriebe 18, Drehmomentkupplung 19 und weiteren Komponenten des Antriebsstrangs kein Drehen des Werkzeugs 4 erfolgt. Vorzugsweise ist die Dauer so lange, dass das Spiel maximal ausgereizt ist, bevor ein Drehen des Werkzeugs 4 einsetzt.The system button 9 is coupled to the engine controller 24 . As soon as a user actuates the system button 9 , the motor control 24 is activated. The engine controller 24 preferably first determines a rotational speed of the engine 25 . If the motor 25 is stopped or the speed falls below a threshold value, a start-up control is activated. In the startup control, the motor 5 is initially rotated in a direction of rotation reversed for the application of the hammer drill 1 . Commercially available drills have a drilling action only in a given direction of rotation, namely in a clockwise direction on the drill bit. Furthermore, the conveying effect of a helix is designed for this direction of rotation. The wrong direction of rotation of the motor 5 is characterized in that the drill 4 is rotated counterclockwise. The motor 5 is rotated upside down for a short duration, preferably less than 100 ms, eg less than 50 ms, and at least 10 ms, eg at least 20 ms. The duration is preferably chosen so short that no rotation of the tool 4 takes place due to the play in the gear 18 , torque clutch 19 and other components of the drive train. Preferably, the duration is so long that the game is maxed out before turning the tool 4 starts.

Die Motorsteuerung 24 kann den Motor 5 mit einer verringerten Leistungsaufnahme im verkehrten Drehsinn drehen. Eine Leistungsaufnahme liegt vorzugsweise im Bereich von 10 % bis 50 % einer nominellen Leistungsaufnahme des Motors 5. Die Amplitude der Ströme, welche in die Magnetspulen eingespeist werden, wird durch die Motorsteuerung 24 begrenzt. Die Strombegrenzung kann beispielsweise im zeitlichen Mittel durch eine Pulsweitenmodulation erfolgen. Das von dem Motor 5 abgegebene Drehmoment ist entsprechend der verringerten Leistungsaufnahme gegenüber einem Drehmoment, welches der Motor 5 bei der nominellen Leistungsaufnahme maximal abgeben kann, verringert. Anschließend an den Ablauf der Dauer steuert die Motorsteuerung 24 den Motor 5 entsprechend des für die Anwendung des Bohrhammers 1 richtigen Drehsinns an. Der Motor 5 kann nun im richtigen Drehsinn beschleunigen, wobei er anfänglich aufgrund des Spiels keine Bewegungsarbeit für das Werkzeug 4 verrichten muss. Dies kann insbesondere bei einem verklemmten Werkzeug 4 von Vorteil sein. Der Motor 5 ist bereits auf einen Drehimpuls beschleunigt, bevor er ein Gegendrehmoment durch das verklemmte Werkzeug 4 erfährt. Ferner kann der Schwung ausreichen, eine drehmoment-gesteuerte Kupplung des Bohrhammers 1 auszulösen. Der Schwung kann ausreichend sein, das verklemmte Werkzeug 4 zu lösen. Die Motorsteuerung 24 hält den richtigen Drehsinn des Motors 5 bei, solange der Anwender den Systemtaster 9 betätigt und keine Blockade des Werkzeugs 4 auftritt.The motor controller 24 may rotate the motor 5 in the reverse direction with reduced power consumption. A power consumption is preferably in the range of 10% to 50% of a nominal power consumption of the motor 5 . The amplitude of the currents which are fed into the magnet coils is limited by the motor controller 24 . The current limitation can be done, for example, in the time average by a pulse width modulation. The torque output by the motor 5 is reduced in accordance with the reduced power consumption against a torque that the motor 5 can output at the maximum nominal power consumption. Subsequent to the end of the duration, the motor controller 24 controls the motor 5 according to the correct direction of rotation for the application of the hammer drill 1 . The motor 5 can now accelerate in the correct direction of rotation, wherein he initially has to perform no movement work for the tool 4 due to the game. This can be particularly advantageous for a jammed tool 4 . The motor 5 is already accelerated to an angular momentum before it experiences a counter torque by the jammed tool 4 . Furthermore, the momentum can be sufficient to trigger a torque-controlled coupling of the hammer drill 1 . The momentum may be sufficient to release the jammed tool 4 . The motor controller 24 maintains the correct direction of rotation of the motor 5 , as long as the user actuates the system button 9 and no blockage of the tool 4 occurs.

Die Motorsteuerung 24 erhöht für den zweiten Drehsinn die Leistungsaufnahme des Motors 5 auf die nominelle Leistungsaufnahme, um dem Anwender ein hohes Drehmoment zum Arbeiten mit der Werkzeugmaschine bereitzustellen.The motor controller 24 increases the power consumption of the motor 5 to the nominal power consumption for the second direction of rotation in order to provide the user with a high torque for working with the machine tool.

Wenn ein Anwender den Systemtaster 9 loslässt, beendet die Motorsteuerung 24 ein Antreiben des Motors 5. In einer ersten Variante unterbricht die Motorsteuerung 24 eine Stromzufuhr zu allen Magnetspulen, wodurch der Motor 5 ausläuft. Andere Varianten sehen ein aktives Bremsen des Motors 5 beispielsweise durch Kurzschließen der Magnetspulen oder durch Ansteuern der Magnetspulen, derart dass ein Gegendrehmoments zum Bremsen des Motors 5 bis zum Stillstand erzeugt wird.When a user releases the system button 9 , the motor controller 24 stops driving the motor 5 . In a first variant, the motor controller 24 interrupts a power supply to all solenoid coils, whereby the motor 5 expires. Other variants see an active braking of the motor 5, for example by shorting the solenoid coils or by driving the magnetic coils, such that a counter-torque for braking the motor 5 is generated to a standstill.

Der Bohrhammer 1 kann eine Sensorik 25 zum Erfassen einer Drehblockade des Werkzeugs 4 zu erkennen. Sobald die Sensorik 25 eine Blockade erkennt, wird der Motor 5 aktiv gebremst.The hammer drill 1 can detect a sensor 25 for detecting a rotational blockade of the tool 4 . As soon as the sensor 25 detects a blockage, the motor 5 is actively braked.

Claims (9)

Werkzeugmaschine mit
einem Werkzeugaufnahme (2) zum Aufnehmen eines Werkzeugs (4),
einem Motor (5),
einem Antriebsstrang (7, 18, 19), der den Motor (5) mit der Werkzeugaufnahme (2) zum Übertragen eines Drehmoments koppelt,
einem Systemtaster (9), auf dessen Betätigung durch einen Anwender ansprechend eine Motorsteuerung (24), den Motor (5) für eine Dauer in einem ersten Drehsinn und anschließend in einem dem ersten Drehsinn entgegengesetzten Drehsinn dreht, wobei die Dauer kürzer als 100 ms ist.Machine tool with
a tool holder ( 2 ) for receiving a tool ( 4 ),
a motor ( 5 ),
a drive train ( 7 , 18 , 19 ) which couples the motor ( 5 ) to the tool holder ( 2 ) for transmitting a torque,
a system button ( 9 ) actuated by a user in response to a motor control ( 24 ) rotating the motor ( 5 ) for a duration in a first direction of rotation and then in a direction opposite to the first direction of rotation, the duration being less than 100 ms , Werkzeugmaschine nach Anspruch 1, dadurch gekennzeichnet, dass das Werkzeug (4) einen für seine Funktion vorgegebenen Drehsinn hat und die Werkzeugmaschine (1) ausgelegt ist, mit Drehen des Motors (5) im zweiten Drehsinn das Werkzeug (4) mittels der Werkzeugaufnahme (2) mit dem vorgegebenen Drehsinn zu drehen.Machine tool according to claim 1, characterized in that the tool ( 4 ) has a predetermined direction of rotation for its function and the machine tool ( 1 ) is designed, with rotation of the motor ( 5 ) in the second direction of rotation, the tool ( 4 ) by means of the tool holder ( 2 ) with the given direction of rotation. Werkzeugmaschine nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Motor (5) ein bürstenloser Elektromotor ist.Machine tool according to claim 1 or 2, characterized in that the motor ( 5 ) is a brushless electric motor. Werkzeugmaschine nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Motorsteuerung (24) ein Drehen des Motors (5) im zweiten Drehsinn bis zu einem der beiden Ereignisse fortsetzt: Loslassen des Systemtasters (9) oder ein Ansprechen einer Sensorik (25) zum Erkennen eine Blockade des Werkzeugs (4).Machine tool according to one of the preceding claims, characterized in that the motor control ( 24 ) continues to rotate the motor ( 5 ) in the second direction of rotation to one of the two events: releasing the system button ( 9 ) or a response of a sensor ( 25 ) for detecting a blockage of the tool ( 4 ). Werkzeugmaschine nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass eine Leistungsaufnahme des Motors (5) beim Drehen im ersten Drehsinn auf ein erstes Niveau begrenzt ist, welches geringer als 50 % einer Leistungsaufnahme des Motors (5) beim Drehen im zweiten Drehsinn ist.Machine tool according to one of the preceding claims, characterized in that a power consumption of the motor ( 5 ) when rotating in the first direction of rotation is limited to a first level which is less than 50% of a power consumption of the motor ( 5 ) when rotating in the second direction of rotation. Steuerungsverfahren für eine Werkzeugmaschine (1), welches ansprechend auf ein Betätigen eines Systemtasters (7) zur Inbetriebnahme eines Motors (5) zuerst den Motor (5) für eine Dauer von höchstens 100 ms in einem ersten Drehsinn dreht und anschließend den Motor (5) in einem dem ersten Drehsinn entgegengesetzten zweiten Drehsinn dreht, mit welchem ein Werkzeug in einem seiner Funktion entsprechenden Drehsinn durch die Werkzeugmaschine gedreht wird.Control method for a machine tool ( 1 ), which, in response to an actuation of a system button ( 7 ) for starting up a motor ( 5 ), first rotates the motor ( 5 ) for a duration of at most 100 ms in a first direction of rotation and then the motor ( 5 ) rotates in a second direction of rotation opposite to the first direction of rotation, with which a tool is rotated by the machine tool in a direction of rotation corresponding to its function. Steuerungsverfahren nach Anspruch 6, dadurch gekennzeichnet, dass der Motor (5) im zweiten Drehsinn gedreht wird, bis entweder der Anwender den Systemtaster (7) loslässt oder eine Sensorik (25) ein Blockieren des Werkzeugs (4) erfasst.Control method according to claim 6, characterized in that the motor ( 5 ) is rotated in the second direction of rotation until either the user releases the system button ( 7 ) or a sensor ( 25 ) detects a blockage of the tool ( 4 ). Steuerungsverfahren nach Anspruch 6 oder 7, dadurch gekennzeichnet, dass eine Leistungsaufnahme des Motors (5) beim Drehen im ersten Drehsinn auf ein Niveau begrenzt ist, welches geringer als 50 % der Leistungsaufnahme des Motors (5) beim Drehen im zweiten Drehsinn ist.Control method according to claim 6 or 7, characterized in that a power consumption of the motor ( 5 ) when rotating in the first direction of rotation is limited to a level which is less than 50% of the power consumption of the motor ( 5 ) when rotating in the second direction of rotation. Steuerungsverfahren nach einem der Ansprüche 6 bis 8, dadurch gekennzeichnet, dass auf Betätigen des Systemtasters eine Drehzahl des Motors bestimmt wird, und ein Drehen in dem ersten Drehsinn nur erfolgt, wenn die Drehzahl geringer als ein Schwellwert ist.Control method according to one of claims 6 to 8, characterized in that on actuation of the system button, a speed of the motor is determined, and a rotation in the first direction of rotation only takes place when the speed is less than a threshold value.
EP20120155287 2011-04-27 2012-02-14 Machine tool and control method Active EP2517839B1 (en)

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DE102011017579A1 (en) 2012-10-31
EP2517839B1 (en) 2015-04-08
EP2517839A3 (en) 2013-12-04
US9126321B2 (en) 2015-09-08
US20120274254A1 (en) 2012-11-01

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