EP3429788A1 - Procédé de fonctionnement d'une machine-outil et machine-outil pouvant être actionnée par le procédé - Google Patents

Procédé de fonctionnement d'une machine-outil et machine-outil pouvant être actionnée par le procédé

Info

Publication number
EP3429788A1
EP3429788A1 EP17709703.7A EP17709703A EP3429788A1 EP 3429788 A1 EP3429788 A1 EP 3429788A1 EP 17709703 A EP17709703 A EP 17709703A EP 3429788 A1 EP3429788 A1 EP 3429788A1
Authority
EP
European Patent Office
Prior art keywords
motor current
machine tool
operating
motor
electric motor
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.)
Pending
Application number
EP17709703.7A
Other languages
German (de)
English (en)
Inventor
Christian Sattler
Tobias Drexl
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.)
Hilti AG
Original Assignee
Hilti AG
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 Hilti AG filed Critical Hilti AG
Publication of EP3429788A1 publication Critical patent/EP3429788A1/fr
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D7/00—Accessories specially adapted for use with machines or devices of the preceding groups
    • B28D7/005—Devices for the automatic drive or the program control of the machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B35/00—Methods for boring or drilling, or for working essentially requiring the use of boring or drilling machines; Use of auxiliary equipment in connection with such methods
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B45/00—Hand-held or like portable drilling machines, e.g. drill guns; Equipment therefor
    • B23B45/02—Hand-held or like portable drilling machines, e.g. drill guns; Equipment therefor driven by electric power
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/14—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by boring or drilling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2226/00—Materials of tools or workpieces not comprising a metal
    • B23B2226/75—Stone, rock or concrete
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2260/00—Details of constructional elements
    • B23B2260/128—Sensors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2270/00—Details of turning, boring or drilling machines, processes or tools not otherwise provided for
    • B23B2270/48—Measuring or detecting

Definitions

  • the present invention relates to a method for operating a machine tool, in particular a core drilling machine, with an electric motor for driving a drilling tool, in particular a drill bit, and with a control and regulating device for controlling and controlling the motor current of the electric motor. Moreover, the present invention relates to a machine tool operable with the present method.
  • Cutting tools such as drill bits are rotated by core drilling machines to cut holes in hard materials.
  • the materials may be, for example, concrete, cement, brickwork or the like.
  • the drill bit is connected to the core drill and rotated by means of the electric motor of the core drill in a rotary motion.
  • the core drill is connected by means of a so-called drill stand with the respective material into which the hole is to be cut.
  • the drill stand is then bonded to the material (i.e., bolted, braced, or by a vacuum device to the base of the drill stand).
  • a propulsion device is positioned between the core drilling machine and the drill stand.
  • the propulsion device serves to move the core drilling machine along with the drill bit along the drill stand.
  • the propulsion device can be either manually, i. operated by the user by means of a handwheel, or automatically, i. by its own drive motor.
  • the movement sequence or the feed along the drill stand takes place in accordance with a stored program.
  • the core drilling process usually begins with a so-called drilling mode.
  • the drill bit is operated at a relatively low rotational speed.
  • the propulsion device drives the core drilling machine together with the slowly rotating drill bit also relatively slowly in the direction of the material.
  • the drill bit After the drill bit has contact with the surface of the material (eg concrete), it is pressed onto the material with a relatively low contact pressure. Since it is usually around is a relatively hard material, at a high contact pressure on the drill bit whose speed drops sharply or the drill bit completely come to a standstill.
  • the material eg concrete
  • the object of the present invention is therefore to provide a method for operating a machine tool, in particular a core drilling machine, with which the problem described above can be achieved and, in particular, a sufficiently high drilling or cutting capacity of the drill bit can be achieved at a relatively low rotational speed.
  • the object is thus achieved by a method for operating a machine tool, in particular a core drilling machine, with an electric motor for driving a drilling tool, in particular a drill bit, and with a control and regulating device for regulating and controlling the motor power by means of motor current of the electric motor.
  • the method comprises the method steps:
  • the control and regulating device current By the oscillating behavior of the control and regulating device current is impulsively passed to the electric motor, a sufficiently high drilling and cutting capacity of the drill bit can be achieved with a relatively low speed. With the help of the increased power at low speed, a controlled and simultaneously faster propulsion in the material to be machined is achieved.
  • the predetermined threshold value it may be possible for the predetermined threshold value to be the tilt point for the motor current.
  • the predetermined motor current value is the holding current for the motor current.
  • the electric motor may be a universal motor.
  • Fig. 1 is a schematic representation of a machine tool according to the invention
  • Fig. 2 is a graphical representation of a motor characteristic at e.g. 20000 rpm;
  • Fig. 3 is a graphical representation of a motor characteristic in a corresponding
  • Fig. 5 is a graphical representation of the motor current waveform in an oscillating
  • Fig. 1 shows a machine tool 1 according to the present invention.
  • the machine tool 1 is a core drilling machine for cutting holes in hard materials W, such as concrete, cement, brickwork or the like.
  • the machine tool configured as a core drilling machine 1 is movably connected to a drill stand 3 via a drive device 2.
  • the drill stand 3 essentially comprises a foot device 4 and a guide rail 5.
  • the foot device 4 can be mounted horizontally on a substrate W to be processed.
  • the attachment takes place by means of screws, which are not shown in the figures.
  • the vacuum device generates a negative pressure, by which the drill stand is held on the ground.
  • the bracing or the vacuum device are not shown in the figures.
  • the foot device 4 may also be attached to a vertical wall or inclined plane so as to respectively mount and hold the entire drill stand 3 on the vertical wall or on the inclined plane.
  • the guide rail 5 extends at a 90 ° angle to the foot device 4 (see Fig. 1).
  • the guide rail 5 may also be connected at an angle greater or smaller than 90 ° with the foot device 4.
  • the guide rail 5 includes on one side a rack device 6, which extends approximately over the entire length of the guide rail 5.
  • the drive device 2 is positioned between the core drilling machine 1 and the drill stand 3. With the aid of the drive device 2, the core drilling machine 1 can be moved along the guide rail 5 of the drill stand 3. With reference to the embodiment shown in Fig. 1, the core drilling machine 1 can be reversibly moved in the direction of arrow A or B.
  • the drive device 2 has a first fastening device with which the core drilling machine can be detachably connected to the housing of the drive device 2. The first fastening device is not shown in the figures.
  • the drive device also contains a second fastening device, with which the housing of the drive device 2 can be connected to the guide rail 5 of the drill stand.
  • the second fastening device is also not shown in the figures.
  • the second fastening device has a holding unit (not shown) and a gear unit (also not shown). With the help of the holding unit, the drive device 2 holds firmly on the guide rail 5. The appropriately designed gear engages the rack device and thereby guides the drive device 2 along the guide rail 5.
  • the drive device 2 further has a drive.
  • the drive may be an electric motor together with gearbox or translation unit.
  • the electric motor may be, for example, a universal motor. However, other suitable electric motors are possible.
  • the drive device 2 may also have instead of an electric motor drive only a handwheel for manually driving the drive device.
  • the handwheel is not shown in the figures.
  • the drive device 2 further comprises a control device, with which the movement parameters, i. the speed, distance, motion start and end of travel and other parameters of the drive device can be controlled relative to the drill stand.
  • the machine tool 1 embodied as a core drilling machine essentially comprises a housing, a drive unit, a transmission, a control and regulating device, a drive shaft and an output shaft 8.
  • the control and regulating device contains a regulator for regulating and controlling the motor current.
  • the drive unit, the transmission, the control device and the drive shaft are not shown in the figures.
  • a drilling tool 9 is connected in the form of a drill bit.
  • the drill bit 9 has at a free end on a cutting edge 10, with which the material to be machined material can be cut to produce a wellbore.
  • the drive unit embodied as an electric motor displaces the drill bit 9 in a rotational movement in the direction N. Both the drill bit 9 and the output shaft rotate about the common axis of rotation R.
  • the control and regulating device serves to control or regulate the drive unit designed as an electric motor.
  • the rotational speed of the electric motor is controlled or regulated.
  • a particular mode can be set according to the particular situation of the drilling operation.
  • the control and regulating device has several modes.
  • the gear can be selected and engaged via the control and regulating device.
  • a gear is selected and inserted accordingly to the transmission of the core drilling machine 1.
  • the gear to be selected is determined by the diameter of the drill bit 9 used.
  • the speed of the electric motor is set according to which this is to rotate.
  • the transmission and in particular the selected gear of the transmission can rotate the drill bit 9 at a corresponding speed.
  • an on-off switch is operated on the core drilling machine 1.
  • the on-off switch is part of the control and regulating device and not shown in the figures.
  • the drill bit 9 After pressing the on-off switch, the drill bit 9 starts to rotate in the direction N.
  • the drill bit 9 and in particular the cutting edge 10 of the drill bit 9 are still at the beginning of the drilling process (in the direction of arrow B) over the material W.
  • the position of the drill bit 9 on the material W is not shown in the figures.
  • a specific mode for operating the core drilling machine 1 is selected via an input on the control and regulating device.
  • the drill bit 9 and the output shaft 8 rotate at an idle speed (NO).
  • This mode is a so-called drilling mode.
  • This Anbohrmodus the speed of the drill bit 9 and the output shaft 8 is reduced so that it is lower than the idle speed.
  • the speed in the tapping mode is approximately 50% lower than the idle speed ( ⁇ 50% of nO).
  • the core drilling machine 1 is moved with the rotating drill bit 9 by means of the drive device 2 along the guide rail 6 of the drill stand 3 on the material W (arrow A in Fig. 1).
  • the drill bit 9 is pressed with a relatively low contact force on the material W (arrow A) to a first guide groove in the surface of the material W to to cut.
  • the pressing force is generated by the drive device 2 and regulated or controlled by means of the control and regulating device of the drive device 2.
  • the depth in the direction of arrow A is approximately between 2 to 5 mm.
  • a relatively low contact force is necessary because otherwise the high speed of the drill bit 9 due to the high resistance of the hard material W drops too much or the drill bit 9 can also come to a complete standstill. With too low a speed correspondingly reduces the performance of the drill bit 9, i. in particular, the cutting performance of the drill bit 9 in the material W, whereby no sufficient drilling progress can be achieved.
  • the machine tool 1 embodied as a core drilling machine further contains a number of sensors, by means of which the actual rotational speed of the output shaft 8 and of the drill bit 9 can be measured at any time.
  • the sensors are not shown in the figures.
  • the measured values determined by the sensors are sent for evaluation to the control and regulating device of the core drilling machine 1 and to the control and regulating device of the drive device 2.
  • the contact pressure of the drill bit 9 on the material W exceeds a certain threshold, can be determined by means of the sensors, a predetermined first Sch well value for the motor current.
  • the determination of the first threshold value takes place via a derivation of the mains voltage.
  • the predetermined first threshold value points to an excessively high speed reduction due to the excessive contact pressure and a corresponding power loss of the drill bit 9.
  • the predetermined first threshold value may be the so-called tilt point for the motor current (1 kipp ) of the electric motor.
  • Too much speed reduction and associated power loss in this context means that the core drilling can not be performed efficiently (ie, a very slow Bohrvor suits) or even a complete standstill of the drill bit 9 in the material W.
  • the excessive speed reduction and the corresponding Power loss of the drill bit 9 are passed to the control and regulating device of the core drilling machine 1 and to the control and regulating device of the drive device 2.
  • a so-called holding current I 0 is impressed on the electric motor via the control and regulating device of the core drilling machine 1.
  • the holding current l 0 serves to reduce the rotational speed of the drill bit 9 when the force of the drill bit 9 is reduced to the material W and the resistance of the electric motor of the core drilling machine 1 decreases.
  • the section labeled I represents the normal speed control.
  • the section marked III represents the current control.
  • Fig. 3 shows the graph of the rotational speed N of the electric motor to the motor current Lot when using a coring machine 1 at a reduced speed in the Anbohrmodus during the Anbohrphase the core drilling.
  • the reduction of the speed is for example 15% of the idling speed before the core drilling process.
  • the tilting point is reached earlier or relatively early.
  • the tilting point for the motor current when using a core drilling machine 1 is at a speed of e.g. 20,000 rpm during a core drilling operation at approximately 19 A.
  • the tipping point for the motor current is only 13 A.
  • the control device of the core drilling machine 1 makes the electric motor pulsate by causing the controller to oscillate (oscillating behavior) for controlling and controlling the motor current.
  • the resulting current waveform is shown in the graph in FIG. It should be noted that the RMS value (rms value) of the motor current does not exceed predefined limit values.
  • the delivery of the pulses to the electric motor can be arbitrary, controlled or regulated. Due to the oscillating behavior or oscillation of the controller, the power output of the drill bit 9 is increased at a low speed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Control Of Electric Motors In General (AREA)

Abstract

L'invention concerne un procédé de fonctionnement d'une machine-outil (1), en particulier d'une carotteuse, avec un moteur électrique pour l'entraînement d'un outil de forage, en particulier un trépan (9) et avec un dispositif de commande et de réglage pour le réglage et la commande de la puissance du moteur au moyen du courant moteur du moteur électrique. Le procédé est caractérisé par les étapes de procédé consistant à : faire fonctionner la machine-outil (1) dans un mode de perçage avec une première valeur de vitesse de rotation, la première valeur de vitesse de rotation étant inférieure à une valeur de vitesse de ralenti prédéfinie du moteur électrique ; déterminer une première valeur seuil prédéfinie pour le courant moteur ; réduire le courant moteur jusqu'à une seconde valeur seuil prédéfinie (l o) lorsque la première valeur seuil pour le courant moteur est dépassée ; faire fonctionner la machine-outil (1) avec une seconde valeur de vitesse de rotation, la seconde valeur de vitesse de rotation étant inférieure à la première valeur de vitesse de rotation ; faire fonctionner le moteur électrique avec un courant moteur prédéfini ; et faire fonctionner le dispositif de commande et de réglage pour régler la puissance du moteur au moyen du courant moteur dans un comportement oscillant. L'invention concerne également une machine-outil pouvant fonctionner avec le procédé.
EP17709703.7A 2016-03-14 2017-03-13 Procédé de fonctionnement d'une machine-outil et machine-outil pouvant être actionnée par le procédé Pending EP3429788A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP16160122.4A EP3219422A1 (fr) 2016-03-14 2016-03-14 Procédé pour l'opération d' une machine outil et machine outil opérable avec ce procédé
PCT/EP2017/055766 WO2017157815A1 (fr) 2016-03-14 2017-03-13 Procédé de fonctionnement d'une machine-outil et machine-outil pouvant être actionnée par le procédé

Publications (1)

Publication Number Publication Date
EP3429788A1 true EP3429788A1 (fr) 2019-01-23

Family

ID=55527471

Family Applications (2)

Application Number Title Priority Date Filing Date
EP16160122.4A Withdrawn EP3219422A1 (fr) 2016-03-14 2016-03-14 Procédé pour l'opération d' une machine outil et machine outil opérable avec ce procédé
EP17709703.7A Pending EP3429788A1 (fr) 2016-03-14 2017-03-13 Procédé de fonctionnement d'une machine-outil et machine-outil pouvant être actionnée par le procédé

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP16160122.4A Withdrawn EP3219422A1 (fr) 2016-03-14 2016-03-14 Procédé pour l'opération d' une machine outil et machine outil opérable avec ce procédé

Country Status (6)

Country Link
US (1) US11000971B2 (fr)
EP (2) EP3219422A1 (fr)
BR (1) BR112018015088B1 (fr)
CA (1) CA3015145C (fr)
RU (1) RU2018136067A (fr)
WO (1) WO2017157815A1 (fr)

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EP2887167A1 (fr) 2013-12-20 2015-06-24 HILTI Aktiengesellschaft Procédé de commande d'un appareil comprenant un dispositif d'outil ainsi qu'un dispositif d'avance motorisée
EP3087945A1 (fr) * 2015-04-28 2016-11-02 HILTI Aktiengesellschaft Détection de surface intelligente et début de carottage

Also Published As

Publication number Publication date
RU2018136067A (ru) 2020-04-15
US20190077046A1 (en) 2019-03-14
BR112018015088A2 (pt) 2018-12-11
CA3015145A1 (fr) 2017-09-21
CA3015145C (fr) 2022-09-13
BR112018015088B1 (pt) 2024-03-12
RU2018136067A3 (fr) 2020-06-03
WO2017157815A1 (fr) 2017-09-21
EP3219422A1 (fr) 2017-09-20
US11000971B2 (en) 2021-05-11

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