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EP4061581A1 - Procédé de fonctionnement de machine-outil, et machine-outil associée - Google Patents

Procédé de fonctionnement de machine-outil, et machine-outil associée

Info

Publication number
EP4061581A1
EP4061581A1 EP20800684.1A EP20800684A EP4061581A1 EP 4061581 A1 EP4061581 A1 EP 4061581A1 EP 20800684 A EP20800684 A EP 20800684A EP 4061581 A1 EP4061581 A1 EP 4061581A1
Authority
EP
European Patent Office
Prior art keywords
tool
output shaft
machine tool
control device
determined
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
EP20800684.1A
Other languages
German (de)
English (en)
Other versions
EP4061581B1 (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
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 EP4061581A1 publication Critical patent/EP4061581A1/fr
Application granted granted Critical
Publication of EP4061581B1 publication Critical patent/EP4061581B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • 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
    • 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 such as a cutting, grinding or diamond disc, and a machine tool for carrying out such a method.
  • a further object of the present invention is to create a machine tool for carrying out such a method.
  • the method has the following method steps:
  • a tool detaching itself from the output shaft can be easily and reliably recognized and responded 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 by comparing the difference between the determined rotational speed values of the output shaft and the tool with the limit value, it is easy to distinguish between safe operation and unsafe operation.
  • the limit value corresponds essentially to zero, since a speed of the tool deviating from the speed of the output shaft indicates that the tool is loosening.
  • the ratio In the event that there is a ratio between an area of the output shaft, where its speed is determined, and an area of the output shaft to which the tool is connected, the ratio must be included in the comparison of the speed values.
  • the method according to the invention is basically applicable to all machine tools that have a tool rotatably connected to an output shaft, so that it can also be used, for example, with circular saws, drills or the like.
  • the speed value of the output shaft can be determined in a structurally simple and cost-effective way by evaluating a motor current and / or by an angle sensor that interacts with the output shaft, for example a fall sensor that interacts with a magnetic disk.
  • the sensor device can determine the speed of the tool, preferably on the basis of an optical, magnetic and / or electrostatic operating principle or the like, the tool used in each case being designed accordingly that the sensor inputs direction can determine the speed of the tool.
  • the tool has a predetermined surface facing the sensor device, for example with a configuration 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 indicate to the user that there is a danger in 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 detaching tool.
  • control device switches off the drive device when the defined limit value is exceeded.
  • the control device preferably 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 rotatably brought into operative connection 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 that interacts with the control device Has sensor device, the machine tool being designed to carry out a method described in more detail above.
  • FIG. 1 shows a greatly simplified side view of a hand machine tool designed as an angle grinder, a tool designed as a cutting disk being arranged on an output shaft of the angle grinder;
  • FIG. 2 shows a flow chart of an embodiment of a method according to the invention.
  • Fig. 1 shows a machine tool or hand tool 1 according to the invention, which is designed as an angle grinder in the representation 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 embodied as an angle grinder in the figures has a housing 2 and a tool 3 embodied, for example, as a cutting disc.
  • 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, in particular designed as an electric motor, or a drive device 4, which can be supplied with power in particular via a rechargeable battery 5 that can be connected to the handheld power tool 1.
  • the handheld 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, like a gear 6 and an output shaft 7, is arranged in the interior of the housing 2.
  • the drive 4, designed as an electric motor, for example, the transmission 6 and the output shaft 7 are arranged in the housing 2 and connected to one another in such a way that a torque generated by the electric motor 4 can be transmitted to the transmission 6 and finally to the output shaft 7 .
  • a freely rotating end of the output shaft 7 protruding downward from the housing 2 is connected to the tool, which is designed here as a cutting disk 3, for example via a clamping device which is not shown in detail. The torque of the output shaft 7 can thus be transferred to the cutting disk 3 via.
  • the handheld power tool 1 also has a control device 8 and two sensor devices 9 and 10 in the present case.
  • 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 is used, among other things, to control and regulate the drive 4 and the power supply to the handheld 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 rotational 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 embodied here 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. For example, optical markings of the tool 3 are used to determine the speed of the tool 3 .
  • 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 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 on the basis of a magnetic resistance (reluctance) or an electrical resistance.
  • Fig. 2 shows in a simplified manner 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, for example due to a tool 3 becoming detached from the output shaft 7, can be prevented in a simple and safe manner.
  • the method begins with the start S, in particular when the electric motor 4 is actuated.
  • a first step S1 rotational speed values of the output shaft 7 are determined by means of the first sensor device 9 and these are transmitted to the control device 8.
  • speed values of the tool 3 are determined by means of 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 point in time by the second sensor device 10 from the at the essentially identical point in 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 with a predefined limit value, which is in particular equal to zero or preferably has a small value, and checks whether the difference is greater than the predefined limit value.
  • step S1 If the query result is negative, the method is continued with step S1.
  • step S4 If the query result from step S4 is positive, which can be attributed, for example, to a detachment of the tool 3 from the output shaft 7, d. That is, if the difference 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 detaching tool 3 can be prevented in a simple and safe manner. In addition to the active braking of the electric motor 4, it can alternatively or additionally also be provided that the user is given an acoustic, optical or haptic feedback via an output device in the event that the predefined limit value is exceeded.
  • step E the method is terminated in particular when the electric motor 3 is no longer operated on the turnaround side.

Landscapes

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

Abstract

L'invention concerne un procédé de fonctionnement d'une machine-outil (1), en particulier un meuleuse d'angle, comprenant un outil (3) pouvant être relié rotatif et fonctionnel à un arbre de sortie (7), la machine-outil (1) comportant un dispositif d'entraînement (4) destinée à actionner l'arbre de sortie (7), un dispositif de commande (8) destiné à actionner le dispositif d'entraînement (4) et au moins un dispositif capteur (9, 10) relié fonctionnel au dispositif de commande (8). Dans le procédé selon l'invention : - une valeur de vitesse de l'arbre de sortie (7) est déterminée ; - une valeur de vitesse de l'outil (3) est déterminée au moyen du dispositif de détection (10) qui coopère avec l'outil (3) ; - le dispositif de commande (8) réalise une commande prédéfinie d'un dispositif de sortie et/ou une commande prédéfinie du dispositif d'entraînement (4), lorsque la différence entre la valeur de vitesse déterminée de l'arbre de sortie (7) et la valeur de vitesse déterminée de l'outil est supérieure à une valeur limite définie. La présente invention concerne également une machine-outil (1) destinée à mettre en oeuvre ce type de procédé.
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 true EP4061581A1 (fr) 2022-09-28
EP4061581B1 EP4061581B1 (fr) 2023-10-11

Family

ID=68834937

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) CN114641373B (fr)
WO (1) WO2021099157A1 (fr)

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US5154242A (en) * 1990-08-28 1992-10-13 Matsushita Electric Works, Ltd. Power tools with multi-stage tightening torque control
US6424799B1 (en) * 1993-07-06 2002-07-23 Black & Decker Inc. Electrical power tool having a motor control circuit for providing control over the torque output of the power tool
GB9320181D0 (en) * 1993-09-30 1993-11-17 Black & Decker Inc Improvements in and relating to power tools
DE19632401A1 (de) * 1996-08-12 1998-02-19 Delmag Maschinenfabrik Bohrgerät
US20030089511A1 (en) * 2001-11-12 2003-05-15 Yukio Tsuneda Electric tool
US7395871B2 (en) * 2003-04-24 2008-07-08 Black & Decker Inc. Method for detecting a bit jam condition using a freely rotatable inertial mass
WO2004108331A2 (fr) * 2003-06-11 2004-12-16 Cambridge Consultants Ltd Dispositif actionne par manivelle
JP2005118910A (ja) * 2003-10-14 2005-05-12 Matsushita Electric Works Ltd インパクト回転工具
JP4211676B2 (ja) * 2004-05-12 2009-01-21 パナソニック電工株式会社 インパクト回転工具
JP2005327191A (ja) * 2004-05-17 2005-11-24 Fanuc Ltd サーボ制御装置
US7410006B2 (en) * 2004-10-20 2008-08-12 Black & Decker Inc. Power tool anti-kickback system with rotational rate sensor
US20070007023A1 (en) * 2005-07-06 2007-01-11 Becker Paul A Rotatable pneumatic power tool and method for quickly stopping rotation of the same
DE102006045502A1 (de) * 2006-09-27 2008-04-03 Jungheinrich Ag Vorrichtung zur Regelung eines Hybrid-Antriebssystems für ein Kraftfahrzeug, insbesondere ein Flurförderzeug
SE532224C2 (sv) * 2008-02-15 2009-11-17 Atlas Copco Tools Ab Pneumatiskt kraftverktyg försett med indikeringsorgan för arbetsparametervärden
DE102010000722A1 (de) * 2010-01-07 2011-07-14 Robert Bosch GmbH, 70469 Handwerkzeugmaschinenvorrichtung
CN202077393U (zh) * 2011-04-29 2011-12-21 北京亨运通机械有限公司 玉米收获机动力输出摩擦片防损坏报警装置
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Also Published As

Publication number Publication date
US20220402110A1 (en) 2022-12-22
CN114641373A (zh) 2022-06-17
CN114641373B (zh) 2024-10-25
WO2021099157A1 (fr) 2021-05-27
EP4061581B1 (fr) 2023-10-11
EP3825067A1 (fr) 2021-05-26

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