EP4061581B1 - Procédé de fonctionnement d'une machine-outil et machine-outil - Google Patents

Procédé de fonctionnement d'une machine-outil et machine-outil Download PDF

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Publication number
EP4061581B1
EP4061581B1 EP20800684.1A EP20800684A EP4061581B1 EP 4061581 B1 EP4061581 B1 EP 4061581B1 EP 20800684 A EP20800684 A EP 20800684A EP 4061581 B1 EP4061581 B1 EP 4061581B1
Authority
EP
European Patent Office
Prior art keywords
tool
machine tool
driven shaft
control device
speed value
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.)
Active
Application number
EP20800684.1A
Other languages
German (de)
English (en)
Other versions
EP4061581A1 (fr
Inventor
Christian Koschel
Jan Friedmann
Stoyanka Ivanova
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
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Hilti AG
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Filing date
Publication date
Application filed by Hilti AG filed Critical Hilti AG
Publication of EP4061581A1 publication Critical patent/EP4061581A1/fr
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Publication of EP4061581B1 publication Critical patent/EP4061581B1/fr
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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
    • B25F5/001—Gearings, speed selectors, clutches or the like specially adapted for rotary tools
    • 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
    • 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
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • B24B23/028—Angle tools

Definitions

  • the invention relates to a method for operating a machine tool, in particular an angle grinder, with a tool that can be rotatably brought into operative connection with an output shaft, for example a cutting, grinding or diamond wheel, and a machine tool for carrying out such a method.
  • a machine tool with a tool that can be brought into operative connection in a rotatable manner with an output shaft, with a drive device for actuating the output shaft and a control device for actuating the drive device and at least one sensor device operatively connected to the control device for determining a speed value of the output shaft and for determining a speed value of the tool is already available from the US 2016/375570 A1 known.
  • machine tools for example angle grinders, sawing machines or the like
  • the tool driven by the machine tool for example a cutting wheel, grinding wheel or diamond wheel of an angle grinder or a saw blade of a sawing machine, in particular during the processing of a material, such as wood or concrete, detaches from the output shaft.
  • a material such as wood or concrete
  • a method for operating a machine tool, in particular an angle grinder, with a tool that can be brought into operative connection in a rotatable manner with an output shaft is therefore proposed, wherein the machine tool has a drive device for actuating the output shaft, a control device for actuating the drive device and at least one sensor device operatively connected to the control device having.
  • a tool that comes away from the output shaft can be easily and reliably recognized and reacted to.
  • the risk of injury to a user of the machine tool and damage to the machine tool can be effectively reduced by taking appropriate measures.
  • a method according to the invention it is possible to easily distinguish between safe operation and unsafe operation by comparing the difference between the determined speed values of the output shaft and the tool with the limit value.
  • the limit value essentially corresponds to zero, since a speed of the tool that deviates from the speed of the output shaft indicates that the tool has become loose.
  • the gear ratio In the event that there is a gear ratio between a region of the output shaft where the speed is determined and a region of the output shaft to which the tool is connected, the gear ratio must be taken into account when comparing the speed values.
  • the method according to the invention can basically be used in all machine tools that have a tool that is rotatably connected to an output shaft, so that it can also be used, for example, in circular saws, drills or the like.
  • the speed value of the output shaft can be determined in a structurally simple and cost-effective manner by evaluating a motor current and/or by an angle sensor that interacts with the output shaft, for example via a Hall sensor that interacts with a magnetic disk.
  • the sensor device can preferably determine the speed of the tool using an optical, magnetic and/or electrostatic operating principle or the like, with the tool used in each case being designed accordingly, so that the sensor device can determine the speed of the tool.
  • the tool has a predetermined surface facing the sensor device, for example with a design that varies in the circumferential direction.
  • the output device is designed to output an acoustic and/or optical and/or haptic warning signal in order to quickly inform the user that a dangerous situation exists such that there is a difference between the determined speed of the output shaft and the determined speed of the tool is greater than the defined limit value and in particular there is a loosening tool.
  • the control device switches off the drive device when the defined limit value is exceeded.
  • the control device actively brakes the drive device so that the output shaft comes to a standstill particularly quickly and the risk of injury to a user and damage to the machine tool is further reduced.
  • a machine tool in particular an angle grinder, with a tool that can be brought into operative connection in a rotatable manner with an output shaft, the machine tool having a drive device for actuating the output shaft, a control device for actuating the drive device and at least one sensor device that interacts with the control device , wherein the machine tool is designed to carry out a method described in more detail above.
  • Fig. 1 shows a machine tool or hand-held machine tool 1 according to the invention, which is designed as an angle grinder in the illustration shown.
  • the machine tool 1 can also be designed as a drilling machine, a sawing machine, such as a circular saw, or the like.
  • the machine tool 1 which is designed as an angle grinder in the figures, has a housing 2 and a tool 3, which is designed, for example, as a cutting disk.
  • the housing 2 preferably has at least one holding area where a user can hold and guide the machine tool 1 with one or both hands.
  • the tool 3 can be actuated by a drive or a drive device 4, in particular designed as an electric motor, which can be supplied with power in particular via an accumulator 5 that can be connected to the hand-held power tool 1.
  • the hand-held power tool 1 can also be supplied with electrical power from a network via a power cable.
  • the drive 4 for actuating the tool 3 in a rotating movement is arranged inside the housing 2, as are a gear 6 and an output shaft 7.
  • a freely rotating end of the output shaft 7 that protrudes downwards from the housing 2 is connected to the tool, which is designed here as a cutting disk 3, for example via a clamping device that is not shown in more detail. The torque of the output shaft 7 can thus be transmitted to the cutting disk 3.
  • the hand-held power tool 1 also has a control device 8 and, in the present case, two sensor devices 9 and 10.
  • the sensor devices 9 and 10 are with the Control device 8 electrically and electronically connected. Signals can be sent between the sensor devices 9 and 10 and the control device 8.
  • the control device 8 is in turn electrically and electronically connected to the electric motor 4 and the accumulator 5. Signals can be sent between the sensor devices 9 and 10 and the electric motor 4 and the accumulator 5.
  • the control device 8 serves, among other things, to control and regulate the drive 4 and the power supply of the hand-held power tool 1.
  • the first sensor device 9 is designed to determine a speed of the output shaft 7 and is designed, for example, as an angle sensor.
  • the speed values of the output shaft 7 determined by the first sensor device 9 are transmitted from the first sensor device 9 to the control device 8.
  • speed values of the output shaft 7 are determined by evaluating a motor current of the electric motor 4.
  • the second sensor device 10 is designed as an optical sensor device and directly determines a speed of the tool 3 by interacting with a surface of the tool 3 that varies in the circumferential direction of the tool 3. To determine the speed of the tool 3, for example, optical markings of the tool 3 are used. The speed values of the tool 3 determined by the second sensor device 10 are transmitted from the second sensor device 10 to the control device 8.
  • the second sensor device can also determine a speed of the tool 3 in cooperation with the tool 3 using a magnetic, electrostatic or other physical operating principle. It can also be provided that the speed of the tool 3 is determined based on a magnetic resistance (reluctance) or an electrical resistance.
  • Fig. 2 shows in simplified form the sequence of an embodiment of a method according to the invention, by means of which injury to a user and damage to the machine tool 1 can be prevented in a simple and safe manner, for example due to a tool 3 becoming detached from the output shaft 7.
  • the method begins with the start S, in particular when the electric motor 4 is actuated.
  • a first step S1 speed values of the output shaft 7 are determined using the first sensor device 9 and these are transmitted to the control device 8.
  • speed values of the tool 3 are determined using the second sensor device 10 and these are transmitted to the control device 8.
  • the control device 8 compares the speed values determined at the same time by the sensor devices 9, 10 in step S3, in particular by comparing the respective speed values of the tool 3 determined at a specific time by the second sensor device 10 from the essentially identical time from the first sensor device 9 determined speed value of the output shaft 7 is subtracted.
  • step S4 the control device 8 compares the determined difference amount with a predefined limit value, which is in particular equal to zero or preferably has a small value, and checks whether the difference amount is greater than the predefined limit value.
  • step S1 If the query result is negative, the process continues with step S1.
  • step S4 If the query result from step S4 is positive, which can be attributed, for example, to the tool 3 being detached from the output shaft 7, i.e. that is, if the difference amount is greater than the predefined limit value, the control device 8 controls the electric motor 4 in step S5 in such a way that the electric motor 4 is actively braked and the output shaft 7 quickly comes to a standstill. In this way, injury to a user and damage to the machine tool 1 caused by a tool 3 coming off can be prevented in a simple and safe manner.
  • the user In addition to the active braking of the electric motor 4, it can alternatively or additionally be provided that the user is given acoustic, visual or haptic feedback via an output device in the event that the predefined limit value is exceeded.
  • step E the method is ended in particular when the electric motor 3 is no longer operated by the user.

Landscapes

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

Claims (6)

  1. Procédé permettant de faire fonctionner une machine-outil (1), en particulier une meuleuse d'angle, comportant un outil (3) pouvant être amené en liaison fonctionnelle de manière à pouvoir tourner avec un arbre entraîné (7), dans lequel la machine-outil (1) présente un dispositif d'entraînement (4) permettant d'actionner l'arbre entraîné (7), un dispositif de commande (8) permettant d'actionner le dispositif d'entraînement (4) et au moins un dispositif capteur (9, 10) en liaison fonctionnelle avec le dispositif de commande (8), comprenant les étapes suivantes :
    - détermination d'une valeur de vitesse de rotation de l'arbre entraîné (7),
    - détermination d'une valeur de vitesse de rotation de l'outil (3) à l'aide du dispositif capteur (10) qui coopère avec l'outil (3),
    - commande d'un dispositif de sortie et/ou commande prédéfinie du dispositif d'entraînement (4) par le dispositif de commande (8) lorsqu'une différence entre la valeur de vitesse de rotation déterminée de l'arbre entraîné (7) et la valeur de vitesse de rotation déterminée de l'outil est supérieure à une valeur limite définie.
  2. Procédé selon la revendication 1, caractérisé en ce que la valeur de vitesse de rotation de l'arbre entraîné (7) est déterminée par une évaluation d'un courant moteur et/ou par un capteur d'angle (9) coopérant avec l'arbre entraîné (7).
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que le dispositif capteur (10) détermine la vitesse de rotation de l'outil (3) au moyen d'un principe de fonctionnement optique, magnétique et/ou électrostatique.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que le dispositif de sortie est configuré pour émettre en sortie un signal acoustique et/ou optique et/ou haptique.
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que le dispositif de commande (8) désactive le dispositif d'entraînement (4) en cas de dépassement de la valeur limite définie.
  6. Machine-outil (1), en particulier meuleuse d'angle, permettant de mettre en oeuvre un procédé selon l'une des revendications 1 à 5, comportant un outil (3) pouvant être amené en liaison fonctionnelle de manière à pouvoir tourner avec un arbre entraîné (7), dans lequel la machine-outil (1) présente un dispositif d'entraînement (4) permettant d'actionner l'arbre entraîné (7), un dispositif de commande (8) permettant d'actionner le dispositif d'entraînement (4) et au moins un dispositif capteur (9, 10) coopérant avec le dispositif de commande (8), dans lequel le dispositif capteur (9, 10) est configuré pour déterminer une valeur de vitesse de rotation de l'arbre entraîné (7) ainsi qu'une valeur de vitesse de rotation de l'outil (7), et le dispositif de commande est configuré pour commander un dispositif de sortie et/ou le dispositif d'entraînement (4) lorsqu'une différence entre la valeur de vitesse de rotation déterminée de l'arbre entraîné (7) et la valeur de vitesse de rotation déterminée de l'outil (3) est supérieure à une valeur limite définie.
EP20800684.1A 2019-11-21 2020-11-09 Procédé de fonctionnement d'une machine-outil et machine-outil Active EP4061581B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP19210606.0A EP3825067A1 (fr) 2019-11-21 2019-11-21 Procédé de fonctionnement d'une machine-outil et machine-outil
PCT/EP2020/081454 WO2021099157A1 (fr) 2019-11-21 2020-11-09 Procédé de fonctionnement de machine-outil, et machine-outil associée

Publications (2)

Publication Number Publication Date
EP4061581A1 EP4061581A1 (fr) 2022-09-28
EP4061581B1 true EP4061581B1 (fr) 2023-10-11

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Family Applications (2)

Application Number Title Priority Date Filing Date
EP19210606.0A Withdrawn EP3825067A1 (fr) 2019-11-21 2019-11-21 Procédé de fonctionnement d'une machine-outil et machine-outil
EP20800684.1A Active EP4061581B1 (fr) 2019-11-21 2020-11-09 Procédé de fonctionnement d'une machine-outil et machine-outil

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP19210606.0A Withdrawn EP3825067A1 (fr) 2019-11-21 2019-11-21 Procédé de fonctionnement d'une machine-outil et machine-outil

Country Status (4)

Country Link
US (1) US20220402110A1 (fr)
EP (2) EP3825067A1 (fr)
CN (1) CN114641373A (fr)
WO (1) WO2021099157A1 (fr)

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Also Published As

Publication number Publication date
WO2021099157A1 (fr) 2021-05-27
EP4061581A1 (fr) 2022-09-28
EP3825067A1 (fr) 2021-05-26
US20220402110A1 (en) 2022-12-22
CN114641373A (zh) 2022-06-17

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