EP4137270A1 - Appareil de meulage, son procédé de fonctionnement, ainsi que disque de meulage - Google Patents

Appareil de meulage, son procédé de fonctionnement, ainsi que disque de meulage Download PDF

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Publication number
EP4137270A1
EP4137270A1 EP21192148.1A EP21192148A EP4137270A1 EP 4137270 A1 EP4137270 A1 EP 4137270A1 EP 21192148 A EP21192148 A EP 21192148A EP 4137270 A1 EP4137270 A1 EP 4137270A1
Authority
EP
European Patent Office
Prior art keywords
grinding
movement
grinding wheel
wobbling
shaft
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Withdrawn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
EP21192148.1A
Other languages
German (de)
English (en)
Inventor
Thomas Mahler
Michael Lacher
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 EP21192148.1A priority Critical patent/EP4137270A1/fr
Priority to PCT/EP2022/071778 priority patent/WO2023020837A1/fr
Priority to EP22760930.2A priority patent/EP4387809A1/fr
Publication of EP4137270A1 publication Critical patent/EP4137270A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
    • 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
    • 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
    • B24B23/03—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor the tool being driven in a combined movement
    • 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
    • B24B23/04—Portable grinding machines, e.g. hand-guided; Accessories therefor with oscillating grinding tools; Accessories therefor
    • 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
    • B24B47/00—Drives or gearings; Equipment therefor
    • B24B47/10—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces
    • B24B47/12—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces by mechanical gearing or electric power
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D7/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor
    • B24D7/02—Wheels in one piece
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D7/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor
    • B24D7/06—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor with inserted abrasive blocks, e.g. segmental
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D7/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor
    • B24D7/18—Wheels of special form

Definitions

  • the present invention relates to a grinder with a motor, which grinder can be connected to a grinding wheel.
  • the grinding device is set up to enable a wobbling movement of the grinding wheel in addition to a grinding movement in a flat plane when the grinding wheel is connected to the grinding device.
  • the grinding device is in particular able to carry out a grinding movement which represents a superimposition of a grinding movement in a planar plane and a wobbling movement of the grinding wheel.
  • the grinder can be operated in two working modes, whereby the wobbling movement can be switched off by a locking device.
  • the invention relates to a method for operating a grinding device and a grinding wheel for the grinding device, the grinding wheel having an imbalance to support the wobbling movement.
  • the invention is located in the technical field of grinders.
  • Essentially three types of devices are known there, namely angle grinders, orbital sanders and eccentric sanders.
  • the aim of the present invention is to improve the grinding performance of such a device. All three device types have in common that they have a grinding wheel as a tool, whereby the grinding wheel is usually circular in the case of the angle and random orbital sanders and rectangular or square in the case of the orbital sanders.
  • the preferably circular grinding wheel performs a purely rotational movement.
  • the grinding wheel has grinding elements on its outer circle, with which the substrate is processed abrasively.
  • angle grinders can be used to remove concrete or to process concrete surfaces.
  • the grinding movement is a rotation on a planar plane that is formed by the substrate to be processed.
  • the grinding elements can, for example, be diamond grinding elements or can include diamonds in order to increase the grinding performance of the grinding wheel.
  • a preferably rectangular sanding plate can be covered with a sanding agent such as sandpaper be, wherein the sanding plate preferably moves in a circle on a planar sanding plane.
  • the grinding element itself does not perform any rotary movement, so it is moved by the grinding plate.
  • the grinding wheel In conventional eccentric grinders, as known from the prior art, the grinding wheel not only rotates, but also performs eccentric movements in its center. Through the combination of eccentric and rotary movement in a planar grinding plane, a very fine removal and a homogeneous grinding pattern can be achieved. Metal, plastic, wood, glass, paints and varnishes can be surface-processed using random orbital sanders.
  • the object on which the present invention is based is to overcome the above-described deficiencies and disadvantages of the prior art and to provide a sander with which the sanding performance can be further increased without significantly increasing the vibration load for the user of the sander increase.
  • experts would appreciate it if the improved grinding performance were not associated with any increased physical stress for the user of the grinding device and if a homogeneous, even grinding pattern of the machined surface were to result.
  • Another object of the invention is to provide a grinding wheel and a method of operation for a grinder that can help to improve the grinding performance of the grinder.
  • a grinding device with a motor wherein the grinding device can be connected to a grinding wheel.
  • the grinding device is set up to enable a wobbling movement of the grinding wheel in addition to a grinding movement in a flat plane when the grinding wheel is connected to the grinding device. It is in the sense According to the invention, it is particularly preferred that the grinding movement in the planar plane and the wobbling movement of the grinding wheel are superimposed.
  • An additional wobbling vibration of the grinding wheel is preferably superimposed on the rotary grinding movement in a planar plane, with the wobbling movement being fixed in a vibration node within the grinding device.
  • the superimposed movement preferably corresponds to the movement of a pendulum body, which is fixedly mounted at a suspension point and executes a circular movement in the area of the pendulum body.
  • the nodal point of oscillation of the proposed grinding device corresponds to the suspension point of such a pendulum and the pendulum body, which preferably executes the circular movement, corresponds to the grinding wheel. Due to the superimposition of the rotating grinding movement and the wobbling movement, the grinding wheel performs a preferably three-dimensional movement, in which only part of the grinding wheel is in direct contact with the grinding object or the substrate to be processed.
  • the wobbling movement is preferably referred to as "three-dimensional" within the meaning of the invention, because when such a wobbling movement is carried out, the grinding wheel is not only essentially parallel to a substrate to be machined, but because the grinding wheel has at least partially no contact with the substrate during the wobbling movement and this "takes off". Possible positions of the grinding wheel are in 2 shown.
  • the grinding movement of a grinding wheel in a planar plane which is known from the prior art, is preferably referred to as “two-dimensional” within the meaning of the invention.
  • the wobbling movement of the grinding wheel is made possible by a wobbling movement of a grinding shaft, which is explained in the next section. It is preferred within the meaning of the invention that the terms “planar” and “planar” are preferably used synonymously within the meaning of the invention.
  • the grinding wheel is connected to a grinding shaft on the grinding device, with the grinding shaft having a rigid section and a wobbling section.
  • the transition between the rigid section and the wobbling section of the grinding shaft is preferably formed by the nodal point of oscillation of the wobbling movement of the grinding wheel, this nodal point of oscillation preferably also being referred to as the “fixed point”.
  • the grinding shaft has such a fixed point, with the fixed point dividing the grinding shaft into the rigid section and the wobbling section.
  • a fixed or fixed mounting of the grinding shaft is preferably provided at this fixed point.
  • the area above the fixed point preferably represents the rigid section of the grinding shaft, while the area below the fixed point represents the wobbling section of the grinding shaft. It is preferred within the meaning of the invention that the grinding device has a fixed bearing for the grinding shaft in a transition area between the wobbling section of the grinding shaft and the rigid section of the grinding shaft.
  • the wobbling movement of the grinding shaft corresponds to the movement of a thread pendulum, which is fixedly mounted at its suspension point and executes a circular movement in the area of the pendulum body.
  • the suspension point of the thread pendulum preferably corresponds to the fixed point or the nodal point of oscillation of the grinding shaft of the proposed grinding device.
  • an improved grinding performance can be made possible with the proposed grinding device without the user of the grinding device having to increase the contact pressure to the negative pressure.
  • the working efficiency of the grinding device can be significantly improved by the invention, in particular the provision of a wobbling movement of the grinding wheel, without the work with the grinding device becoming more strenuous or cumbersome for the user.
  • the grinding device has a flexible bearing for the grinding shaft in a region of the wobbling section of the grinding shaft, which enables the wobbling movement.
  • this preferably means that a flexible mounting of the grinding shaft is provided at the level of the wobbling region of the grinding shaft, which enables the wobbling movement of the grinding wheel or the grinding shaft.
  • the flexible mounting is preferably provided at the level of the lower section of the grinding shaft, ie below the fixed point of the grinding shaft or below the nodal point of oscillation of the grinding shaft.
  • the flexible mounting of the grinding shaft has an elastic element which enables the wobbling movement of the grinding wheel.
  • the flexible mounting can be realized by a preferably resiliently shaped bearing seat or particularly preferably by using a bearing seat, with the bearing seat comprising a flexible material or flexible elastomers, such as rubber or silicone.
  • the wobbling movement of the grinding wheel or the grinding shaft is made possible in particular by the fact that the grinding shaft is supported by two bearings, a first or upper bearing being fixed and a second or lower bearing being flexible.
  • a fixed bearing is provided in the nodal point or fixed point and a soft, flexible bearing in the lower area of the grinding shaft.
  • the combination of two different bearings for the grinding shaft makes a decisive contribution to the fact that a preferably three-dimensional wobbling movement of the grinding wheel or the grinding shaft can be provided.
  • the grinding device includes a locking device for determining the flexible mounting.
  • the locking device can be used to lock the flexible bearing of the grinding shaft in particular in order to "stop" the wobbling movement of the grinding shaft or grinding wheel, so that the grinder returns to a simple, preferably two-dimensional grinding movement in a planar plane when the locking device is locked.
  • the wobbling movement of the grinding wheel or the grinding shaft can preferably be prevented by the locking device.
  • the grinding device preferably only performs the grinding movement in the flat plane, but not the wobbling movement. The provision of the locking device thus enables the proposed grinding device to be operated in two working modes.
  • the grinding device can work in the known working mode with a rotary grinding movement in a plane plane, while in a second working mode the grinding device is set up to work with a superimposition of the rotary grinding movement in a plane plane and a wobbling movement, with these Wobbling movement is made possible in particular by the provision of the flexible mounting of the grinding shaft.
  • the locking device is preferably in the area of the flexible mounting of the grinding shaft of the proposed grinding device.
  • the locking device can, for example, be designed in a manner comparable to a drill chuck.
  • the locking device can preferably be configured essentially orthogonally to a rotational axis of the machine tool and/or be clamped onto the corresponding bearing.
  • the locking device can be formed by a cone that can be adjusted essentially parallel to the axis of rotation.
  • the term “substantially” does not represent an unclear formulation for the person skilled in the art, since the person skilled in the art knows that the term “essentially” includes deviations of, for example, 1-5% from the mathematically correct orthogonality or parallelism. Such deviations can occur, for example, due to production.
  • the grinder has a drive coupling element for damping vibrations.
  • the drive coupling element is preferably in the area of the fixed point or the nodal point of oscillation of the grinding shaft of the proposed grinding device.
  • the wobbling movement of the grinding wheel can preferably be supported by using a grinding wheel with a targeted imbalance.
  • the imbalance of the grinding wheel can be achieved by an asymmetrical arrangement of the grinding elements, a smaller or larger grinding element and/or a corresponding design of the base body of the grinding wheel.
  • the base body is preferably set up to accommodate the abrasive or the abrasive elements. The base body therefore represents the connection between the abrasive and the proposed grinding device.
  • the wobbling movement can be switched off by actuating a locking device.
  • the grinding device can be operated in two working modes, with the grinding device performing a grinding movement in a flat plane in a first working mode and with the grinding device performing a grinding movement in a second working mode, which superimposes a grinding movement in a flat plane and a tumbling movement of the grinding wheel.
  • the provision of the locking device means that the grinder can advantageously be used in two working modes, with the first working mode essentially corresponding to the performance of a conventional grinder, in which a grinding movement is carried out in a planar grinding plane.
  • this planar grinding plane lies essentially parallel to the surface of a substrate or a workpiece to be machined.
  • the grinding shaft is fixed so that it is rigid as a whole.
  • the flexible mounting of the grinding shaft can be fixed with the locking device, so that the wobbling movement made possible by the flexible mounting can be switched on or off with the locking device.
  • the grinding wheel of the grinding device moves according to a superimposed movement of a preferably three-dimensional tumbling movement and the conventional rotating grinding movement of the first working mode. Due to this superimposition, only part of the grinding wheel is in working contact with the substrate to be processed. Application tests have shown that this partial contact between the grinding wheel and the substrate when the grinding device is operated in the second operating mode means that the grinding device can be used particularly efficiently and that a surprisingly homogeneous grinding pattern is obtained.
  • the grinding pressure of the user of the grinding device is thus concentrated on this contact area between the grinding wheel and the substrate.
  • the wobbling movement of the grinding wheel or the grinding shaft, which is supported by the imbalance of the grinding wheel, advantageously applies additional removal pressure to the grinding base. This is comparable to an additional hammer movement that reduces the stock removal during the grinding process elevated. Due to the fixed mounting of the grinding shaft in the nodal point of oscillation or in the fixed point, the vibration load for the user from the wobbling movement can be minimized, as application tests with the invention have shown.
  • the locking device results in two basic operating modes in one device, which significantly increases the flexibility of the grinding device with regard to possible applications and makes it possible to provide a grinding device that can be used in a wide variety of ways.
  • figure 1 12 shows a preferred embodiment of the proposed grinding device 10.
  • the grinding device 10 has a grinding wheel 12 which is driven by a motor M of the grinding device 10.
  • FIG. A grinding shaft 14 is arranged between the motor M and the grinding wheel 12 and transmits the movement of the motor M to the grinding wheel 12 .
  • the grinding shaft 14 has a rigid section 16 and a wobbling section 18, with the rigid section 16 forming an upper area of the grinding shaft 14 and the wobbling section 18 forming a lower area of the grinding shaft 14.
  • the two areas 16, 18 are preferably separated from a fixed point 20 separated from each other, with a rigid, fixed bearing for the grinding shaft 14 being provided in the fixed point 20 .
  • the fixed point 20 preferably represents an oscillation nodal point of a wobbling movement of the grinding shaft 14 or the grinding wheel 12.
  • a drive coupling element 32 can be provided in the area of the fixed point 20 for vibration damping.
  • a flexible bearing 22 of the grinding shaft 14 is provided in the lower area of the grinding shaft 14, which represents the wobbling section 18 of the grinding shaft 14.
  • the flexible bearing 22 advantageously allows the wobbling movement of the grinding shaft 14 or the grinding wheel 12.
  • the flexible bearing 22 preferably comprises an elastic element 24.
  • a locking device 26 can also be provided in the area of the flexible bearing 22, with which the wobbling movement of the grinding wheel 12 or the grinding shaft 14 can be switched off.
  • the flexible mounting 22 of the grinding shaft 14 can be fixed with the locking device 26, so that the wobbling movement of the grinding wheel 12 or the grinding shaft 14 can be prevented by the fixing.
  • FIG 2 shows a schematic representation of the movement of grinding wheel 12 and grinding shaft 14.
  • the object to be processed such as a background U
  • the fixed point 20 or the nodal point 20 of the oscillation of the wobbling movement of the grinding wheel 12 or the grinding shaft 14 is shown.
  • the middle range of 2 possible positions of the grinding wheel 12 or the grinding shaft 14 are shown, while the grinding wheel 12 or the grinding shaft 14 execute a wobbling movement. It can be clearly seen that only a part or partial section of the grinding wheel 12 is in contact with the substrate U, so that the contact pressure of the user acts on the substrate in particular in this contact area between the grinding wheel 12 and the substrate U.
  • the unit consisting of the grinding shaft 14 and the grinding wheel 12 mimics the circular movement of a thread pendulum according to, where the grinding wheel 12 corresponds to the pendulum body and the fixed point 20 corresponds to the suspension point of the thread pendulum.
  • the inside 2 The region of the grinding shaft 14 illustrated preferably represents the lower, wobbling section 18 of the grinding shaft 14.
  • FIG. 3 shows a schematic representation of a preferred embodiment of the grinding wheel 12 with an imbalance.
  • the exemplary embodiment of the invention illustrated shows a base body 30 of a grinding wheel 12 and a series of grinding elements 28.
  • the grinding elements 28 preferably form the grinding means; for example, it can be diamond grinding elements or diamond segments.
  • the grinding elements 28 are preferably present on an outer edge of the base body 30 of the grinding wheel 12 .
  • the unbalance of the grinding wheel 12 can be brought about in different ways.
  • the base body 30 of the grinding wheel 12 can be designed asymmetrically.
  • the grinding elements 28 are arranged asymmetrically on the grinding wheel 12 or the base body 30 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
EP21192148.1A 2021-08-19 2021-08-19 Appareil de meulage, son procédé de fonctionnement, ainsi que disque de meulage Withdrawn EP4137270A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP21192148.1A EP4137270A1 (fr) 2021-08-19 2021-08-19 Appareil de meulage, son procédé de fonctionnement, ainsi que disque de meulage
PCT/EP2022/071778 WO2023020837A1 (fr) 2021-08-19 2022-08-03 Meuleuse, son procédé de fonctionnement et disque de meulage
EP22760930.2A EP4387809A1 (fr) 2021-08-19 2022-08-03 Meuleuse, son procédé de fonctionnement et disque de meulage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP21192148.1A EP4137270A1 (fr) 2021-08-19 2021-08-19 Appareil de meulage, son procédé de fonctionnement, ainsi que disque de meulage

Publications (1)

Publication Number Publication Date
EP4137270A1 true EP4137270A1 (fr) 2023-02-22

Family

ID=77411636

Family Applications (2)

Application Number Title Priority Date Filing Date
EP21192148.1A Withdrawn EP4137270A1 (fr) 2021-08-19 2021-08-19 Appareil de meulage, son procédé de fonctionnement, ainsi que disque de meulage
EP22760930.2A Pending EP4387809A1 (fr) 2021-08-19 2022-08-03 Meuleuse, son procédé de fonctionnement et disque de meulage

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP22760930.2A Pending EP4387809A1 (fr) 2021-08-19 2022-08-03 Meuleuse, son procédé de fonctionnement et disque de meulage

Country Status (2)

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EP (2) EP4137270A1 (fr)
WO (1) WO2023020837A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2952103A (en) * 1957-04-04 1960-09-13 Bisterfeld & Stolting Grinding wheels with abrasive elements of rectangular shape
WO2004037489A2 (fr) * 2002-10-25 2004-05-06 Carl Zeiss Vision Gmbh Procede et dispositif de production de verres optiques
KR20090110017A (ko) * 2008-04-17 2009-10-21 전인택 연삭기의 연삭편 유동장치.
EP2463056A2 (fr) * 2010-12-07 2012-06-13 The Boeing Company Préparation d'une surface robotique par un dispositif orbital aléatoire
EP2740846A1 (fr) * 2012-12-10 2014-06-11 BOMAG GmbH & Co. OHG Machine de compactage

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2952103A (en) * 1957-04-04 1960-09-13 Bisterfeld & Stolting Grinding wheels with abrasive elements of rectangular shape
WO2004037489A2 (fr) * 2002-10-25 2004-05-06 Carl Zeiss Vision Gmbh Procede et dispositif de production de verres optiques
KR20090110017A (ko) * 2008-04-17 2009-10-21 전인택 연삭기의 연삭편 유동장치.
EP2463056A2 (fr) * 2010-12-07 2012-06-13 The Boeing Company Préparation d'une surface robotique par un dispositif orbital aléatoire
EP2740846A1 (fr) * 2012-12-10 2014-06-11 BOMAG GmbH & Co. OHG Machine de compactage

Also Published As

Publication number Publication date
EP4387809A1 (fr) 2024-06-26
WO2023020837A1 (fr) 2023-02-23

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