EP3538320B1 - Grinding element and grinding apparatus - Google Patents

Grinding element and grinding apparatus Download PDF

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Publication number
EP3538320B1
EP3538320B1 EP17800794.4A EP17800794A EP3538320B1 EP 3538320 B1 EP3538320 B1 EP 3538320B1 EP 17800794 A EP17800794 A EP 17800794A EP 3538320 B1 EP3538320 B1 EP 3538320B1
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EP
European Patent Office
Prior art keywords
grinding
belt
grinder
stop surface
layer
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Application number
EP17800794.4A
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German (de)
French (fr)
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EP3538320A1 (en
Inventor
Michael Geiger
Nathanael Sutter
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Bayerische Motoren Werke AG
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Bayerische Motoren Werke AG
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Publication of EP3538320A1 publication Critical patent/EP3538320A1/en
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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
    • B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
    • B24B21/18—Accessories
    • B24B21/20—Accessories for controlling or adjusting the tracking or the tension of the grinding belt
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D11/00—Constructional features of flexible abrasive materials; Special features in the manufacture of such materials
    • B24D11/02—Backings, e.g. foils, webs, mesh fabrics
    • 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
    • B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
    • B24B19/009—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding profiled workpieces using a profiled grinding tool
    • 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
    • B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
    • B24B19/26—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding workpieces with arcuate surfaces, e.g. parts of car bodies, bumpers or magnetic recording heads
    • 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
    • B24B21/00—Machines or devices using grinding or polishing belts; 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
    • B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
    • B24B21/006—Machines or devices using grinding or polishing belts; Accessories therefor for special purposes, e.g. for television tubes, car bumpers
    • 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
    • B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
    • B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
    • B24B9/04—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of metal, e.g. skate blades
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D15/00—Hand tools or other devices for non-rotary grinding, polishing, or stropping
    • B24D15/02—Hand tools or other devices for non-rotary grinding, polishing, or stropping rigid; with rigidly-supported operative surface
    • B24D15/023—Hand tools or other devices for non-rotary grinding, polishing, or stropping rigid; with rigidly-supported operative surface using in exchangeable arrangement a layer of flexible material
    • 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
    • B24D7/066—Grinding blocks; their mountings or supports
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D9/00—Wheels or drums supporting in exchangeable arrangement a layer of flexible abrasive material, e.g. sandpaper
    • B24D9/08—Circular back-plates for carrying flexible material

Definitions

  • the present invention relates to a grinding belt, a belt grinder or finger grinder, and the use of a belt grinder or finger grinder, or a grinding belt.
  • the U.S. 3,619,949 A discloses a hand grinder with an abrasive belt according to the preamble of claim 1.
  • the WO 2005/102607 A1 refers to grinders. In particular, it is about a placement system that allows for easy placement and removal of sandpaper.
  • the U.S. 2004/0018802 A1 relates to a process for the manufacture of an abrasive product.
  • JP S5020310 B1 and JP S499793A relate to cylindrical grinding elements.
  • the GB 1 167 634 A relates to a flexible abrasive belt comprising locating means for locating the belt on a support structure.
  • the U.S. 2,469,735 A relates to a polishing machine with an abrasive belt designed in such a way that the abrasive belt can follow contours.
  • a sanding belt comprises a sanding surface and a stop surface, the stop surface being positioned offset by an offset to the sanding surface, as a result of which a sanding depth can be adjusted or set.
  • the offset is in a range of about 1-5 mm.
  • the belt or finger grinder is expediently used, e.g. B. sections of (sheet metal) body parts trigger or cut out, for which purpose any existing fasteners such as spot welds, rivets, folds, etc. must be removed as precisely as possible. As indicated at the beginning, this requires very precise work. Multi-layer sheet metal is currently being used more and more. When grinding down a spot weld on a top sheet metal layer, it must be ensured that the sheet metal layers underneath are not damaged. In the present case, an exact grinding depth can expediently be set via the offset, depending on the respective requirement.
  • Belt or finger grinders also offer the advantage that they can also be used with high-strength steels and areas that are difficult to access. In addition, unlike drills, they do not require straight accessibility, so that they can be used extremely flexibly.
  • the grinding belt has the abutment surface or forms it integrally, the grinding belt being a flexible grinding belt, as is the case, for. B. is used in belt or finger grinders. That is according to the invention Abrasive belt stepped or deposited in such a way that it includes or forms both the grinding surface and the stop surface.
  • the grinding surface is provided in the center, viewed along the circumferential direction, with the stop surface corresponding to two staggered side portions of the grinding member located left and right with respect to the grinding surface.
  • These side sections advantageously have a rather smooth surface, since although they also rotate in the circumferential direction, they are not intended to take on a grinding function. This is realized solely by the actual grinding surface.
  • such a grinding belt is designed in one piece or integrally, in other words as "one part" or not separable, which means that it can advantageously be replaced as a whole. A desired grinding depth can be easily set by selecting the appropriate grinding belt.
  • a multi-stage configuration can also be selected, which, for example, makes it possible to shape or, in particular, grind a correspondingly stepped contour.
  • Such an abrasive belt comprises more than one abrasive surface, e.g. B. two, which are arranged offset to each other.
  • a middle, uppermost grinding surface is provided, flanked by two rearwardly offset lateral grinding surfaces, to which, again offset, the stop surface or stop surfaces are arranged or formed.
  • the grinding belt is designed in two layers, with a first layer, which forms the grinding surface, and a second layer being fastened to one another, in particular in a detachable manner.
  • the first layer is therefore preferably interchangeable.
  • appropriate form-fitting elements are expediently provided between the first and second layer, which enable the first layer to be exchanged, for example in the event of wear or if a different grinding depth is to be realized by using a different first layer.
  • This can namely be advantageously adapted via a different thickness of the first layer, which can be easily replaced if necessary.
  • Typical interlocking elements are based, for example based on a hook-and-loop fastener principle, including corresponding hooks and eyelets, etc.
  • Other attachment methods for example based on adhesives such as double-sided adhesive tapes, etc., are also possible.
  • the stop surface is designed, for example by applying a coating or a sliding element, to enable or support easy displacement on the surface to be processed, especially if the area to be ground is not point-shaped, as with a rivet, but linear, such as at a weld, is.
  • the invention also relates to a belt or finger grinder comprising an inventive grinding belt.
  • the grinding area is that area or section where the grinding belt ultimately interacts with a workpiece or component to be machined.
  • a finger sander for example, this would be the front area of the tool in which the sanding belt is deflected.
  • the or the at least one stop surface is expediently provided, which is spaced apart from the grinding surface, so to speak backwards, in such a way that a predetermined grinding depth can be set via this distance.
  • the grinding surface can only penetrate the component until the belt or finger grinder or the grinding area is in contact with the stop surface.
  • the sanding area In the case of a belt sander, the sanding area describes an essentially rectangular area or plane. With the finger grinder is the grinding area at least partially cylindrical or has the shape of a semi-cylinder.
  • the basic structure of a belt or finger grinder is known to a person skilled in the art and is not described further here.
  • the grinding element is a grinding belt that is guided on a support surface, with the support surface forming the stop surface.
  • the offset or the grinding depth is expediently set solely via a strength or thickness of the grinding belt.
  • the support surface is expediently wider than the grinding belt or the grinding surface by a certain amount and thus fulfills the function of the stop surface.
  • this structure is similar to a stepped grinding belt, although the stop surface formed by the support surface does not rotate in this variant.
  • the stop surface is designed to prevent the grinding device from slipping off the component to be machined.
  • the stop surface z. B. provided with a kind of coating or has a certain roughness, which can facilitate the attachment of the grinder to the component / workpiece.
  • the stop surface is designed, for example by applying a coating or a sliding element, to enable or support easy displacement on the surface to be processed, especially if the area to be ground is not point-shaped, as with a rivet, but linear, such as at a weld, is.
  • the abutment surface can have a substantially cylindrical shape or the shape of a semi-cylinder in order to increase the mobility of the grinder, in particular z. B. to allow a pivoting.
  • the invention also relates to the use of a belt or finger sander according to the invention or a sanding belt according to the invention for repairing bodywork, in particular in the field of sheet metal processing, for example for removing spot welds or rivets.
  • FIG. 1 shows a grinding belt 20 seen essentially transversely to a circumferential direction U, which has a first layer 24 and a second layer 25 .
  • a grinding surface 22 is formed on the first layer 24 .
  • the second layer 25 forms a stop surface 30 by means of two corresponding side sections 23.
  • the stop surface 30 is offset from the grinding surface 22 by an offset x.
  • Two sheet metal layers are outlined with the reference numbers 81 and 82 . The right half of the figure shows how the grinding belt 20 penetrates the first metal sheet 81 during processing, with the metal sheet 82 remaining completely intact thanks to an exactly adjusted grinding depth t, which corresponds to the offset x.
  • the finger sander comprises a sanding belt 20 which, in the embodiment shown here, is formed in two layers and has a first layer 24 and a second layer 25, with the first layer 24 forming or comprising a sanding surface 22.
  • the second layer 25 forms a stop surface 30 via two side sections 23, which is offset by an offset x relative to the grinding surface 22, in particular to the rear.
  • the abrasive belt 20 rotates along a circumferential direction U and is deflected about an axis of rotation D, which more or less corresponds to a cylinder axis of the approximately cylindrical abrasive region 2 .
  • a grinding belt 20 has now been described which is designed in two layers or at least in stages, so that it integrally forms the corresponding offset x, via which a grinding depth can be set.
  • the reference number 4 indicates that the component identified by this reference number could also be a support surface for the grinding belt 20, which is stationary. Thus, a grinding depth can also be set solely via a strength or thickness of the grinding belt 20 .

Description

Die vorliegende Erfindung betrifft ein Schleifband, einen Band- oder Fingerschleifer sowie eine Verwendung eines Band- oder Fingerschleifers, oder eines Schleifbands.The present invention relates to a grinding belt, a belt grinder or finger grinder, and the use of a belt grinder or finger grinder, or a grinding belt.

Bei der Instandsetzung von Fahrzeugkarosserien müssen oftmals beispielsweise Karosserieteile aus Blech ausgeschnitten und entfernt werden. Dabei ist es nötig, vorhandene Schweißpunkte oder Nieten zu entfernen, wobei hierzu beispielsweise Schweißpunktbohrer verwendet werden. Nachteilig daran ist, dass bei Verwendung eines Bohrers immer eine (möglichst) geradlinige Zugänglichkeit gegeben sein muss, damit das Werkzeug ohne abzurutschen verwendet werden kann. Problematisch ist weiter, dass bekannte Schweißpunktbohrer bei hochfesten Stählen, wie sie zunehmend im Karosseriebau Verwendung finden, an ihre Grenzen stoßen. Bei der Arbeit mit derartigen Materialien haben sich Band- bzw. Fingerschleifer bewährt. Diese weisen allerdings den Nachteil auf, dass kein wirklich exaktes Entfernen von Schweißpunkten, Nieten etc. möglich ist, da mit diesen handgehaltenen Werkzeugen keine exakte Schleiftiefe realisierbar ist. In der Folge besteht insbesondere die Gefahr, dass zu tief geschliffen wird und darunter liegende Bleche bzw. Blechabschnitte oder Bauteile beschädigt werden.When repairing vehicle bodies, for example, body parts often have to be cut out of sheet metal and removed. It is necessary to remove existing spot welds or rivets, for example spot weld drills being used for this purpose. The disadvantage of this is that when using a drill, access must always be (as far as possible) in a straight line so that the tool can be used without slipping. It is also problematic that known spot weld drills reach their limits with high-strength steels, such as are increasingly being used in body construction. When working with such materials, belt or finger sanders have proven their worth. However, these have the disadvantage that it is not really possible to remove spot welds, rivets, etc. precisely, since it is not possible to achieve an exact grinding depth with these hand-held tools. As a result, there is a particular risk that the grinding will be too deep and that the sheet metal or sheet metal sections or components underneath will be damaged.

Die US 3 619 949 A offenbart einen Handschleifer mit einem Schleifband gemäß dem Oberbegriff von Anspruch 1.the U.S. 3,619,949 A discloses a hand grinder with an abrasive belt according to the preamble of claim 1.

Die WO 2005/102607 A1 bezieht sich auf Schleifgeräte. Insbesondere geht es um ein Anordnungssystem, welches eine leichte Anordnung und Entfernung von Schleifpapier ermöglicht.the WO 2005/102607 A1 refers to grinders. In particular, it is about a placement system that allows for easy placement and removal of sandpaper.

Die US 2004/0018802 A1 betrifft ein Verfahren für die Herstellung eines abrasiven Produkts.the U.S. 2004/0018802 A1 relates to a process for the manufacture of an abrasive product.

Die Dokumente JP S5020310 B1 und JP S499793 A betreffen zylindrische Schleifelemente.The documents JP S5020310 B1 and JP S499793A relate to cylindrical grinding elements.

Die GB 1 167 634 A betrifft ein flexibles Schleifband, welches Anordnungsmittel umfasst, um das Band an einer Tragstruktur anzuordnen.the GB 1 167 634 A relates to a flexible abrasive belt comprising locating means for locating the belt on a support structure.

Die US 2 469 735 A betrifft eine Poliermaschine mit einem Schleifband, derart ausgebildet, dass das Schleifband Konturen folgen kann.the U.S. 2,469,735 A relates to a polishing machine with an abrasive belt designed in such a way that the abrasive belt can follow contours.

Es ist daher eine Aufgabe der vorliegenden Erfindung, ein Schleifband, einen Band- oder Fingerschleifer sowie eine Verwendung eines Schleifbands oder Band- bzw. Fingerschleifers anzugeben, welche die vorgenannten Nachteile beseitigen und ein schnelles und effektives Arbeiten ermöglichen.It is therefore an object of the present invention to specify a grinding belt, a belt or finger grinder and a use of a grinding belt or belt or finger grinder, which eliminate the aforementioned disadvantages and enable fast and effective work.

Diese Aufgabe wird durch ein Schleifband gemäß Anspruch 1, einen Band- oder Fingerschleifer gemäß Anspruch 5 sowie durch eine Verwendung gemäß Anspruch 7 gelöst. Weitere Vorteile und Merkmale ergeben sich aus den Unteransprüchen sowie der Beschreibung und den beigefügten Figuren.This object is achieved by an abrasive belt according to claim 1, a belt or finger grinder according to claim 5 and by a use according to claim 7. Further advantages and features emerge from the subclaims and the description and the attached figures.

Erfindungsgemäß umfasst ein Schleifband eine Schleiffläche und eine Anschlagfläche, wobei die Anschlagfläche um einen Versatz versetzt zu der Schleiffläche positioniert ist, wodurch eine Schleiftiefe einstellbar bzw. eingestellt ist.According to the invention, a sanding belt comprises a sanding surface and a stop surface, the stop surface being positioned offset by an offset to the sanding surface, as a result of which a sanding depth can be adjusted or set.

Insbesondere handelt es sich um ein Schleifband für einen Band- oder Fingerschleifer. Gemäß bevorzugten Ausführungsformen liegt der Versatz in einem Bereich von etwa 1-5 mm. Zweckmäßigerweise dient der Band- oder Fingerschleifer dazu, z. B. Abschnitte von (Blech-)Karosserieteilen auszulösen oder herauszutrennen, wobei hierzu ggf. vorhandene Befestigungselemente, wie Schweißpunkte, Nieten, Falze etc. möglichst punktgenau entfernt werden müssen. Wie eingangs angedeutet, ist hierbei ein sehr exaktes Arbeiten nötig. Derzeit werden vermehrt mehrlagige Bleche verbaut. Beim Abschleifen eines Schweißpunktes auf einer obersten Blechlage muss sichergestellt sein, dass darunter liegende Blechlagen nicht beschädigt werden. Zweckmäßigerweise kann vorliegend über den Versatz eine exakte Schleiftiefe, abhängig von der jeweiligen Anforderung, eingestellt werden. Band- bzw. Fingerschleifer bieten zudem den Vorteil, dass sie auch bei hochfesten Stählen und schwer zugänglichen Bereichen eingesetzt werden können. Überdies erfordern sie, anders als Bohrmaschinen, keine geradlinige Zugänglichkeit, sodass ein äußerst flexibler Einsatz möglich ist.In particular, it is a grinding belt for a belt or finger grinder. According to preferred embodiments, the offset is in a range of about 1-5 mm. The belt or finger grinder is expediently used, e.g. B. sections of (sheet metal) body parts trigger or cut out, for which purpose any existing fasteners such as spot welds, rivets, folds, etc. must be removed as precisely as possible. As indicated at the beginning, this requires very precise work. Multi-layer sheet metal is currently being used more and more. When grinding down a spot weld on a top sheet metal layer, it must be ensured that the sheet metal layers underneath are not damaged. In the present case, an exact grinding depth can expediently be set via the offset, depending on the respective requirement. Belt or finger grinders also offer the advantage that they can also be used with high-strength steels and areas that are difficult to access. In addition, unlike drills, they do not require straight accessibility, so that they can be used extremely flexibly.

Erfindungsgemäß weist das Schleifband die Anschlagfläche auf bzw. bildet diese integral aus, wobei das Schleifband ein flexibles Schleifband ist, wie es z. B. bei Band- oder Fingerschleifern zum Einsatz kommt. Erfindungsgemäß ist das Schleifband derart gestuft bzw. abgesetzt, dass es sowohl die Schleiffläche als auch die Anschlagfläche umfasst bzw. ausbildet. Hierbei ist mittig, entlang der Umfangsrichtung gesehen, die Schleiffläche vorgesehen, wobei die Anschlagfläche durch zwei entsprechend versetzte, links und rechts in Bezug auf die Schleiffläche angeordnete, Seitenabschnitte des Schleifelements gebildet wird. Diese Seitenabschnitte weisen mit Vorteil eine eher glatte Oberfläche auf, da sie zwar ebenfalls in Umfangsrichtung mit rotieren, allerdings keine Schleiffunktion übernehmen sollen. Diese wird allein durch die eigentliche Schleiffläche realisiert. Gemäß einer Ausführungsform ist ein derartiges Schleifband einteilig bzw. integral ausgebildet, mit anderen Worten als "ein Teil" bzw. nicht trennbar, wodurch es mit Vorteil als Ganzes austauschbar ist. Eine gewünschte Schleiftiefe lässt sich unkompliziert durch die Wahl des entsprechenden Schleifbands einstellen.According to the invention, the grinding belt has the abutment surface or forms it integrally, the grinding belt being a flexible grinding belt, as is the case, for. B. is used in belt or finger grinders. That is according to the invention Abrasive belt stepped or deposited in such a way that it includes or forms both the grinding surface and the stop surface. In this case, the grinding surface is provided in the center, viewed along the circumferential direction, with the stop surface corresponding to two staggered side portions of the grinding member located left and right with respect to the grinding surface. These side sections advantageously have a rather smooth surface, since although they also rotate in the circumferential direction, they are not intended to take on a grinding function. This is realized solely by the actual grinding surface. According to one embodiment, such a grinding belt is designed in one piece or integrally, in other words as "one part" or not separable, which means that it can advantageously be replaced as a whole. A desired grinding depth can be easily set by selecting the appropriate grinding belt.

Je nach Anforderung kann auch eine mehrstufige Ausgestaltung gewählt werden, welche beispielsweise ermöglicht, eine entsprechend gestufte Kontur zur formen bzw. insbesondere zu schleifen. Ein derartiges Schleifband, umfasst mehr als eine Schleiffläche, z. B. zwei, welche versetzt zueinander angeordnet sind. Entlang der Umfangsrichtung gesehen ist gemäß einer Ausführungsform eine mittlere, oberste Schleiffläche, flankiert von zwei nach hinten versetzt angeordneten seitlichen Schleifflächen, vorgesehen, zu welchen, wiederum versetzt, die Anschlagfläche bzw. die Anschlagflächen angeordnet bzw. ausgebildet sind.Depending on the requirement, a multi-stage configuration can also be selected, which, for example, makes it possible to shape or, in particular, grind a correspondingly stepped contour. Such an abrasive belt comprises more than one abrasive surface, e.g. B. two, which are arranged offset to each other. According to one embodiment, viewed along the circumferential direction, a middle, uppermost grinding surface is provided, flanked by two rearwardly offset lateral grinding surfaces, to which, again offset, the stop surface or stop surfaces are arranged or formed.

Gemäß einer alternativen Ausführungsform ist das Schleifband zweilagig ausgebildet, wobei eine erste Lage, welche die Schleiffläche ausbildet, und eine zweite Lage, insbesondere lösbar aneinander befestigt sind. Bevorzugt ist die erste Lage also austauschbar. Zweckmäßigerweise sind hierzu zwischen der ersten und der zweiten Lage entsprechende Formschlusselemente vorgesehen, welche einen Austausch der ersten Lage ermöglichen, beispielsweise bei Verschleiß bzw. wenn durch die Verwendung einer anderen ersten Lage eine andere Schleiftiefe realisiert werden soll. Diese kann nämlich vorteilhafterweise über eine unterschiedliche Dicke der ersten Lage angepasst werden, welche bei Bedarf unkompliziert ausgetauscht werden kann. Typische Formschlusselemente basieren beispielsweise auf einem Klettverschlussprinzip, umfassend entsprechende Haken und Ösen etc. Auch andere Befestigungsmethoden, beispielsweise basierend auf Klebemitteln, wie doppelseitigen Klebebändern etc., sind möglich.According to an alternative embodiment, the grinding belt is designed in two layers, with a first layer, which forms the grinding surface, and a second layer being fastened to one another, in particular in a detachable manner. The first layer is therefore preferably interchangeable. For this purpose, appropriate form-fitting elements are expediently provided between the first and second layer, which enable the first layer to be exchanged, for example in the event of wear or if a different grinding depth is to be realized by using a different first layer. This can namely be advantageously adapted via a different thickness of the first layer, which can be easily replaced if necessary. Typical interlocking elements are based, for example based on a hook-and-loop fastener principle, including corresponding hooks and eyelets, etc. Other attachment methods, for example based on adhesives such as double-sided adhesive tapes, etc., are also possible.

Gemäß einer Ausführungsform ist die Anschlagfläche ausgelegt, beispielsweise durch das Anbringen einer Beschichtung oder eines Gleitelements, ein leichtes Verschieben auf der zu bearbeitenden Oberfläche zu ermöglichen oder zu unterstützen, insbesondere wenn der zu schleifende Bereich nicht punktförmig, wie bei einer Niete, sondern linienförmig, wie bei einer Schweißnaht, ist.According to one embodiment, the stop surface is designed, for example by applying a coating or a sliding element, to enable or support easy displacement on the surface to be processed, especially if the area to be ground is not point-shaped, as with a rivet, but linear, such as at a weld, is.

Die Erfindung richtet sich auch auf einen Band- oder Fingerschleifer umfassend ein erfindungsgemäßes Schleifband.The invention also relates to a belt or finger grinder comprising an inventive grinding belt.

Gemäß einer Ausführungsform handelt es sich um einen Bandschleifer oder um einen Fingerschleifer, wobei ein Schleifband entlang einer Umfangsrichtung rotiert. Bei dem Schleifbereich handelt es sich um denjenigen Bereich oder Abschnitt, an welchem das Schleifband letztlich mit einem zu bearbeitenden Werkstück oder Bauteil zusammenwirkt. Bei einem Fingerschleifer wäre dies beispielsweise der vordere Bereich des Werkzeugs, in welchem das Schleifband umgelenkt wird. Zweckmäßigerweise ist in diesem Bereich bzw. allgemein im Schleifbereich die bzw. die zumindest eine Anschlagfläche vorgesehen, welche gegenüber der Schleiffläche derart, sozusagen nach hinten, beabstandet ist, dass über diesen Abstand eine vorgegebene Schleiftiefe einstellbar ist. Die Schleiffläche kann in das Bauteil nur so lange eindringen, bis der Band- oder Fingerschleifer bzw. der Schleifbereich an der Anschlagfläche aufliegt.According to one embodiment, it is a belt grinder or a finger grinder, with a grinding belt rotating along a circumferential direction. The grinding area is that area or section where the grinding belt ultimately interacts with a workpiece or component to be machined. In the case of a finger sander, for example, this would be the front area of the tool in which the sanding belt is deflected. In this area or generally in the grinding area, the or the at least one stop surface is expediently provided, which is spaced apart from the grinding surface, so to speak backwards, in such a way that a predetermined grinding depth can be set via this distance. The grinding surface can only penetrate the component until the belt or finger grinder or the grinding area is in contact with the stop surface.

Beim Bandschleifer beschreibt der Schleifbereich eine im Wesentlichen rechteckige Fläche bzw. Ebene. Beim Fingerschleifer ist der Schleifbereich zumindest abschnittsweise zylindrisch ausgebildet bzw. weist die Form eines Halbzylinders auf. Der grundsätzliche Aufbau eines Band- oder Fingerschleifers ist dem Fachmann bekannt und wird vorliegend nicht weiter beschrieben.In the case of a belt sander, the sanding area describes an essentially rectangular area or plane. With the finger grinder is the grinding area at least partially cylindrical or has the shape of a semi-cylinder. The basic structure of a belt or finger grinder is known to a person skilled in the art and is not described further here.

Erfindungsgemäß ist das Schleifelement ein Schleifband, welches auf einer Auflagefläche geführt ist, wobei die Auflagefläche die Anschlagfläche formt. Zweckmäßigerweise wird allein über eine Stärke bzw. Dicke des Schleifbandes der Versatz bzw. die Schleiftiefe eingestellt. Die Auflagefläche ist zweckmäßigerweise um ein gewisses Maß breiter als das Schleifband bzw. die Schleiffläche und erfüllt damit die Funktion der Anschlagfläche. In einer Grundkonfiguration ähnelt dieser Aufbau einem gestuft ausgebildeten Schleifband, wobei die durch die Auflagefläche gebildete Anschlagfläche bei dieser Variante allerdings nicht rotiert.According to the invention, the grinding element is a grinding belt that is guided on a support surface, with the support surface forming the stop surface. The offset or the grinding depth is expediently set solely via a strength or thickness of the grinding belt. The support surface is expediently wider than the grinding belt or the grinding surface by a certain amount and thus fulfills the function of the stop surface. In a basic configuration, this structure is similar to a stepped grinding belt, although the stop surface formed by the support surface does not rotate in this variant.

Gemäß einer Ausführungsform ist die Anschlagfläche ausgelegt, ein Abrutschen des Schleifgeräts auf dem zu bearbeitenden Bauteil zu verhindern. Hierzu ist die Anschlagfläche z. B. mit einer Art Beschichtung versehen bzw. weist eine gewisse Rauigkeit auf, welche das Ansetzen des Schleifgeräts am Bauteil/Werkstück erleichtern kann.According to one embodiment, the stop surface is designed to prevent the grinding device from slipping off the component to be machined. For this purpose, the stop surface z. B. provided with a kind of coating or has a certain roughness, which can facilitate the attachment of the grinder to the component / workpiece.

Gemäß einer Ausführungsform ist die Anschlagfläche ausgelegt, beispielsweise durch das Anbringen einer Beschichtung oder eines Gleitelements, ein leichtes Verschieben auf der zu bearbeitenden Oberfläche zu ermöglichen oder zu unterstützen, insbesondere wenn der zu schleifende Bereich nicht punktförmig, wie bei einer Niete, sondern linienförmig, wie bei einer Schweißnaht, ist.According to one embodiment, the stop surface is designed, for example by applying a coating or a sliding element, to enable or support easy displacement on the surface to be processed, especially if the area to be ground is not point-shaped, as with a rivet, but linear, such as at a weld, is.

Die Anschlagfläche kann eine im Wesentlichen zylindrische Form bzw. die Form eines Halbzylinders aufweisen, um die Beweglichkeit des Schleifgeräts, insbesondere z. B. ein Verschwenken, zu ermöglichen.The abutment surface can have a substantially cylindrical shape or the shape of a semi-cylinder in order to increase the mobility of the grinder, in particular z. B. to allow a pivoting.

Die Erfindung richtet sich auch auf eine Verwendung eines erfindungsgemäßen Band- oder Fingerschleifers oder eines erfindungsgemäßen Schleifbands zur Karosserieinstandsetzung, insbesondere im Bereich der Blechbearbeitung, beispielsweise zur Entfernung von Schweißpunkten oder Nieten.The invention also relates to the use of a belt or finger sander according to the invention or a sanding belt according to the invention for repairing bodywork, in particular in the field of sheet metal processing, for example for removing spot welds or rivets.

Die im Zusammenhang mit dem Band- oder Fingerschleifer erwähnten Vorteile und Merkmale gelten analog und entsprechend für das Schleifband sowie für die Verwendung bzw. umgekehrt und untereinander. Weitere Vorteile und Merkmale ergeben sich aus der nachfolgenden Beschreibung einer schematischen Ansicht eines Schleifbands mit Bezug auf die beigefügte Figur.The advantages and features mentioned in connection with the belt or finger grinder apply analogously and correspondingly to the grinding belt and to the use or vice versa and among one another. Further advantages and features result from the following description of a schematic view of a grinding belt with reference to the attached figure.

Es zeigen:

Fig. 1:
zwei Prinzipskizzen zur Veranschaulichung des Funktionsprinzips;
Fig. 2:
eine Teilansicht eines Schleifgeräts in einer perspektivischen Ansicht.
Show it:
Figure 1:
two principle sketches to illustrate the functional principle;
Figure 2:
a partial view of a grinder in a perspective view.

Fig. 1 zeigt im Wesentlichen quer zu einer Umfangsrichtung U gesehen ein Schleifband 20, welches eine erste Lage 24 und eine zweite Lage 25 aufweist. An der ersten Lage 24 ist eine Schleiffläche 22 ausgeformt. Die zweite Lage 25 formt eine Anschlagfläche 30 durch zwei entsprechende Seitenabschnitte 23. Die Anschlagfläche 30 ist um einen Versatz x zur Schleiffläche 22 versetzt. Mit dem Bezugszeichen 81 und 82 sind zwei Blechlagen skizziert. In der rechten Bildhälfte ist nun dargestellt, wie das Schleifband 20 bei der Bearbeitung das erste Blech 81 durchdringt, wobei durch eine exakt eingestellte Schleiftiefe t, welche dem Versatz x entspricht, das Blech 82 komplett unversehrt bleibt. 1 shows a grinding belt 20 seen essentially transversely to a circumferential direction U, which has a first layer 24 and a second layer 25 . A grinding surface 22 is formed on the first layer 24 . The second layer 25 forms a stop surface 30 by means of two corresponding side sections 23. The stop surface 30 is offset from the grinding surface 22 by an offset x. Two sheet metal layers are outlined with the reference numbers 81 and 82 . The right half of the figure shows how the grinding belt 20 penetrates the first metal sheet 81 during processing, with the metal sheet 82 remaining completely intact thanks to an exactly adjusted grinding depth t, which corresponds to the offset x.

Fig. 2 zeigt nun eine Teilansicht eines Fingerschleifers mit einem zumindest abschnittsweise zylindrisch ausgebildeten Schleifbereich 2. Der Fingerschleifer umfasst ein Schleifband 20, welches in der hier gezeigten Ausführungsform zweilagig ausgebildet ist und eine erste Lage 24 und eine zweite Lage 25 aufweist, wobei die erste Lage 24 eine Schleiffläche 22 formt bzw. umfasst. Die zweite Lage 25 formt über zwei Seitenabschnitte 23 eine Anschlagfläche 30, welche um einen Versatz x relativ zur Schleiffläche 22, insbesondere nach hinten, versetzt ist. Das Schleifband 20 rotiert entlang einer Umfangsrichtung U und wird um eine Drehachse D umgelenkt, welche quasi einer Zylinderachse des in etwa zylindrischen Schleifbereichs 2 entspricht. Vorliegend wurde nun ein Schleifband 20 beschrieben, welches zweilagig bzw. zumindest gestuft ausgebildet ist, sodass es integral den entsprechenden Versatz x formt, über welchen eine Schleiftiefe eingestellt werden kann. Über das Bezugszeichen 4 ist angedeutet, dass das mit diesem Bezugszeichen gekennzeichnete Bauteil auch eine Auflagefläche für das Schleifband 20 sein könnte, welche still steht. Somit kann allein über eine Stärke bzw. Dicke des Schleifbands 20 ebenfalls eine Schleiftiefe eingestellt werden. 2 now shows a partial view of one Finger grinder with an at least partially cylindrical design Sanding area 2. The finger sander comprises a sanding belt 20 which, in the embodiment shown here, is formed in two layers and has a first layer 24 and a second layer 25, with the first layer 24 forming or comprising a sanding surface 22. The second layer 25 forms a stop surface 30 via two side sections 23, which is offset by an offset x relative to the grinding surface 22, in particular to the rear. The abrasive belt 20 rotates along a circumferential direction U and is deflected about an axis of rotation D, which more or less corresponds to a cylinder axis of the approximately cylindrical abrasive region 2 . A grinding belt 20 has now been described which is designed in two layers or at least in stages, so that it integrally forms the corresponding offset x, via which a grinding depth can be set. The reference number 4 indicates that the component identified by this reference number could also be a support surface for the grinding belt 20, which is stationary. Thus, a grinding depth can also be set solely via a strength or thickness of the grinding belt 20 .

BezugszeichenlisteReference List

22
Schleifbereichgrinding area
44
Auflageflächebearing surface
2020
Schleifbandsanding belt
2222
Schleifflächegrinding surface
2323
Seitenabschnittside section
2424
erste Lagefirst layer
2525
zweite Lagesecond layer
3030
Anschlagflächestop surface
8181
Blechsheet
8282
Blechsheet
xx
Versatzoffset
tt
Schleiftiefegrinding depth
Uu
Umfangsrichtungcircumferential direction
DD
Drehachseaxis of rotation

Claims (7)

  1. Grinding belt (20), comprising a grinding surface (22), configured centrally along a circumferential direction, and a stop surface (30), characterized in that the stop surface (30) is formed by way of two side sections of the grinding belt (20) which are arranged on the left and on the right in relation to the grinding surface (22), and the stop surface (30) being positioned offset by an offset (x) with respect to the grinding surface (22), as a result of which a grinding depth (t) can be set via a height or thickness of the grinding belt (20) .
  2. Grinding belt (20) according to Claim 1, the offset (x) lying in a range from approximately 1 to 5 mm.
  3. Grinding belt (20) according to Claim 1 or 2, the grinding belt (20) being of multiple-layer, in particular two-layer, configuration, and a first layer (24) and a second layer (25) being fastened releasably to one another.
  4. Grinding belt (20) according to one of the preceding claims, the stop surface (30) being designed to prevent slipping off of the grinder, by the stop surface (30) being provided with a type of coating or having a defined roughness which facilitates the positioning of the grinder on the component or workpiece.
  5. Belt grinder or filing sander, comprising a grinding belt (20) according to one of the preceding claims.
  6. Belt grinder or filing sander according to Claim 5, a supporting surface (30) for the grinding belt (20) shaping the stop surface (30).
  7. Use of a belt grinder or filing sander according to either of Claims 5 and 6 or of a grinding belt (20) according to one of Claims 1 to 4 for the highly precise removal of welding spots, rivets or folds.
EP17800794.4A 2016-11-10 2017-11-09 Grinding element and grinding apparatus Active EP3538320B1 (en)

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DE102016222043.8A DE102016222043A1 (en) 2016-11-10 2016-11-10 sharpener
PCT/EP2017/078679 WO2018087194A1 (en) 2016-11-10 2017-11-09 Grinding element and grinding apparatus

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EP3538320B1 true EP3538320B1 (en) 2022-12-28

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EP (1) EP3538320B1 (en)
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TWM546283U (en) * 2017-04-10 2017-08-01 Storm Pneumatic Tool Co Ltd Expandable handheld pneumatic belt type grinding machine

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US20190262965A1 (en) 2019-08-29
DE102016222043A1 (en) 2018-02-22
WO2018087194A1 (en) 2018-05-17

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