EP3825067A1 - 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
EP3825067A1
EP3825067A1 EP19210606.0A EP19210606A EP3825067A1 EP 3825067 A1 EP3825067 A1 EP 3825067A1 EP 19210606 A EP19210606 A EP 19210606A EP 3825067 A1 EP3825067 A1 EP 3825067A1
Authority
EP
European Patent Office
Prior art keywords
tool
output shaft
machine tool
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.)
Withdrawn
Application number
EP19210606.0A
Other languages
German (de)
English (en)
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
Priority to EP19210606.0A priority Critical patent/EP3825067A1/fr
Priority to EP20800684.1A priority patent/EP4061581B1/fr
Priority to PCT/EP2020/081454 priority patent/WO2021099157A1/fr
Priority to CN202080073220.0A priority patent/CN114641373A/zh
Priority to US17/774,335 priority patent/US20220402110A1/en
Publication of EP3825067A1 publication Critical patent/EP3825067A1/fr
Withdrawn legal-status Critical Current

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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
    • 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 that can be rotatably brought into operative connection with an output shaft, for example a cutting, grinding or diamond disk, and a machine tool for performing such a method.
  • a further object of the present invention is to create a machine tool for carrying out such a method.
  • 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 it is possible to distinguish in a simple manner between safe operation and unsafe operation by comparing the difference between the determined rotational speed values of the output shaft and the tool with the limit value.
  • the limit value corresponds essentially to zero, since a speed of the tool that deviates 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 can in principle be used with all machine tools that have a tool that is 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 manner by evaluating a motor current and / or by an angle sensor that interacts with the output shaft, for example a Hall 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, with the tool used in each case being designed in accordance with the sensor device 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 sensor device interacting 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 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 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 at which 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 an accumulator 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 transmitted to the cutting disk 3.
  • the handheld 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 is used, among other things, to control and regulate the drive 4 and to supply power 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 in the present case 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.
  • 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, also on the basis of 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 by in particular the respective speed values of the tool 3 determined at a certain point in time by the second sensor device 10 from that 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 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 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, i. 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.
  • the user 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 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)
EP19210606.0A 2019-11-21 2019-11-21 Procédé de fonctionnement d'une machine-outil et machine-outil Withdrawn EP3825067A1 (fr)

Priority Applications (5)

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
EP20800684.1A EP4061581B1 (fr) 2019-11-21 2020-11-09 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
CN202080073220.0A CN114641373A (zh) 2019-11-21 2020-11-09 用于操作机加工工具的方法和机加工工具
US17/774,335 US20220402110A1 (en) 2019-11-21 2020-11-09 Method for operating a machine tool, and machine tool

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
EP3825067A1 true EP3825067A1 (fr) 2021-05-26

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 After (1)

Application Number Title Priority Date Filing Date
EP20800684.1A Active EP4061581B1 (fr) 2019-11-21 2020-11-09 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)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160046035A1 (en) * 2014-08-12 2016-02-18 Robert Bosch Tool Corporation System And Method For Kickback Detection In A Circular Saw
US20160375570A1 (en) * 2014-01-27 2016-12-29 Robert Bosch Gmbh Machine Tool Device
DE102015217053A1 (de) * 2015-09-07 2017-03-09 Robert Bosch Gmbh Handwerkzeugmaschine
US20180358918A1 (en) * 2017-05-03 2018-12-13 Blount, Inc. Power modulating motor control method
WO2019020165A1 (fr) * 2017-07-24 2019-01-31 Festool Gmbh Outil électrique et procédé pour repérer un événement et/ou un état d'un outil électrique

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US3904305A (en) * 1974-08-19 1975-09-09 Cooper Ind Inc Speed sensing air tool shutoff
SE452208B (sv) * 1981-10-21 1987-11-16 Atlas Copco Ab Sekerhetsanordning mot overvarv vid en pneumatiskt driven rotationsslipmaskin
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
EP1631409A2 (fr) * 2003-06-11 2006-03-08 Cambridge Consultants Limited 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
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
DE102011104901B4 (de) * 2011-06-16 2018-04-12 C. & E. Fein Gmbh Kraftgetriebene Handwerkzeugmaschine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160375570A1 (en) * 2014-01-27 2016-12-29 Robert Bosch Gmbh Machine Tool Device
US20160046035A1 (en) * 2014-08-12 2016-02-18 Robert Bosch Tool Corporation System And Method For Kickback Detection In A Circular Saw
DE102015217053A1 (de) * 2015-09-07 2017-03-09 Robert Bosch Gmbh Handwerkzeugmaschine
US20180358918A1 (en) * 2017-05-03 2018-12-13 Blount, Inc. Power modulating motor control method
WO2019020165A1 (fr) * 2017-07-24 2019-01-31 Festool Gmbh Outil électrique et procédé pour repérer un événement et/ou un état d'un outil électrique

Also Published As

Publication number Publication date
EP4061581A1 (fr) 2022-09-28
US20220402110A1 (en) 2022-12-22
EP4061581B1 (fr) 2023-10-11
CN114641373A (zh) 2022-06-17
WO2021099157A1 (fr) 2021-05-27

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