EP3187305A2 - Plateau de meule et abrasif - Google Patents

Plateau de meule et abrasif Download PDF

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Publication number
EP3187305A2
EP3187305A2 EP16206563.5A EP16206563A EP3187305A2 EP 3187305 A2 EP3187305 A2 EP 3187305A2 EP 16206563 A EP16206563 A EP 16206563A EP 3187305 A2 EP3187305 A2 EP 3187305A2
Authority
EP
European Patent Office
Prior art keywords
dust
abrasive
sanding pad
dust air
sanding
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
EP16206563.5A
Other languages
German (de)
English (en)
Other versions
EP3187305B1 (fr
EP3187305A3 (fr
Inventor
Andreas Randecker
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.)
Festool GmbH
Original Assignee
Festool GmbH
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 Festool GmbH filed Critical Festool GmbH
Publication of EP3187305A2 publication Critical patent/EP3187305A2/fr
Publication of EP3187305A3 publication Critical patent/EP3187305A3/fr
Application granted granted Critical
Publication of EP3187305B1 publication Critical patent/EP3187305B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/06—Dust extraction equipment on grinding or polishing machines
    • B24B55/10—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided
    • B24B55/102—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided with rotating tools
    • 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
    • B24D7/10—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 cooling provisions

Definitions

  • the invention relates to a sanding pad for a hand-grinder, with a drive holder for rotationally fixed attachment to an output of the hand grinder, so that the sanding pad by the grinding machine in a suitable for a grinding machining a workpiece, in particular rotational and / or eccentric, grinding movement can be driven, wherein a sanding pad body of the sanding pad provided with an adhesive layer processing surface for releasably securing a provided with a backing layer, designed in particular as an abrasive sheet and an abrasive layer to an abrasive machining of the workpiece having abrasive, wherein on the processing surface dust air inlet openings for in the Processing of the workpiece resulting, loaded with dust and are arranged through dust air flow openings of the abrasive along a main flow direction dust air are arranged, the with minde a dust discharge device of the grinding machine in the dust-air inflow inlets exhaust air can suck in through the at least one dust
  • Such a sanding pad is for example in EP 2 070 651 B1 explained.
  • the known sanding pad provides suction of the dusty air through the flow-through openings of the abrasive through, in the plane between the abrasive and the sanding pad, so along the working surface of the sanding pad, a cross-flow of fresh air to prevent dust nests is provided between abrasive and sanding plate.
  • the operation of the sanding pad is effective in practice, yet dust gets into the environment of the sanding plate, which again comes between the abrasion layer and the workpiece in the further grinding machining of the workpiece and there leads to undesirable grinding effects.
  • a sanding pad of the type mentioned that it has at least one dust air channel, which has a dust air inlet between the abrasion layer of the abrasive and the machine side of the sanding pad for removing dust from the environment of the abrasive layer and off the abrasion layer with the at least one outflow port is in direct flow communication.
  • dust air is sucked off not only in the main flow direction but also in a transverse flow direction from the workpiece surface.
  • this dust does not reach the discharge opening via the abrasion layer but, for example, directly into one or more of the dust-laden air inlet openings of the grinding plate.
  • dusts in particular very fine dusts are present, they are optimally extracted via the at least one dust air duct.
  • the dust just does not have to flow through the dust-laden air flow openings of the abrasive, but arrives away from the abrasion layer to the at least one dust-air discharge opening.
  • the at least one dust air duct or the arrangement of several dust air ducts and / or their dust air inlets are therefore preferably not provided in or on the abrasion layer, so that it is completely ready for abrasive or abrasive machining of the workpiece, apart from the dust air passage openings.
  • the grinding tool By means of an electric drive motor, a compressed air motor or the like other drive of the grinding machine, the grinding tool, in particular the sanding pad, in a rotational grinding movement and / or an eccentric grinding movement and / or a hypercycloid grinding movement can be driven.
  • the grinding machine preferably has a gear, for example an eccentric gear.
  • the abrasion layer has, for example, a grain or a grinding knit.
  • the at least one dust air channel is preferably in direct flow communication with at least one of the dust air inlet openings.
  • the one in the abrasive provided dust air duct is suitably away from the abrasion layer with the at least one flow opening in direct flow communication.
  • the at least one dusty air channel communicates and / or is in flow communication, for example, directly with the suction channel arrangement and / or at least one of the dusty air inlet openings and / or with the at least one dust discharge opening on the machine side of the sanding plate.
  • the at least one dusty air channel extends to the flow of dust air between the abrasion layer of the abrasive and the machine side of the sanding pad transversely to the main flow direction.
  • the dusty air flows transversely to the main flow direction.
  • the at least one dust inlet for the at least one dust air channel is close to the abrasion layer.
  • the dust inlet for the at least one dust air channel is arranged in a space between the abrasive sheet and the processing surface.
  • the sanding pad body or the sanding pad as a whole has no dust inlet for the at least one dust air channel or other such dust air channels above the working surface. Thus, therefore, all dust air inlets are arranged close to the abrasion layer and not directly, for example, in the sanding pad body.
  • the at least one dust-air inlet or all of the dust-air inlets which are arranged between the abrasion layer and the machine side and are in direct flow communication with the at least one outflow opening are in the region of the adhesion layer or the plane of the adhesion layer and / or in the area of the back adhesion layer or the level of the counter-detention layer are arranged.
  • the sanding pad has an arrangement of several dust air inlets between the machining side and the machine side on its outer circumference, in particular on its radial outer circumference or its outer circumference extending transversely to the machining surface.
  • the dust-air inlets are expediently arranged all in the plane of the adhesive layer or on the adhesive layer.
  • the dust air inlets are expediently arranged at predetermined intervals or angular intervals on the outer circumference of the sanding plate to each other. In particular, the distances are the same. Thus, in equidistant positions, dust air inlets are provided on the outer periphery of the sanding disk.
  • the number of dust air inlets on the outer circumference is limited, for example, that only 40-50 dust air inlets are available at maximum. It can also be provided significantly less dust air inlets, for example, only 20-30 dust air inlets are available. It may also be provided less than 20 dust air inlets on the outer circumference of the sanding pad, for example, only 16-18 dust air inlets.
  • the ratio of flow-tight areas on the outer circumference or inner circumference of a plane in which runs the at least one dusty air channel in the sanding pad or abrasive, due to the at least one dust air channel and the at least one dust-air inlet for a flow of air flow-permeable parts on the outer circumference or inner circumference of this plane Preferably, at least 10 to 1, preferably 5 to 1 and more preferably at least 3 to each other to 1.
  • the abrasive and / or the sanding pad is in this plane circumferentially (inner circumference or outer circumference) substantially flow-tight, but has the dust air inlet or an arrangement of several dust air inlets on.
  • the at least one dust inlet or several dust air inlets are closer to the abrasion layer than to the machine side of the sanding disk.
  • the adhesive layer or the backing layer form a total Velcro connection.
  • the adhesive layer or the backing layer is formed by velor or another textile fabric, while the associated complementary component, ie the backing layer or the adhesive layer, comprises an arrangement of hook-and-loop hooks.
  • a releasable adhesive bond is provided as an adhesive layer and / or backing layer.
  • the adhesive layer and / or the backing layer may extend to the outer edge of the sanding pad, that is over the entire processing surface. But it is also possible that the processing surface has recesses on which no adhesive layer is present. Of course, the backing layer can not extend to the outermost edge region of the abrasive or have recesses.
  • a preferred variant provides that the adhesive layer and / or the backing layer cover, except for an expediently narrow edge region, the working surface of the sanding plate or the attachment surface of the abrasive element opposite this.
  • the edge of the sanding plate and / or abrasive, where no adhesive layer or backing layer is present, can be provided for an air flow, in particular a flow of dust.
  • the edge region of the sanding pad or abrasive, where no adhesive layer or backing layer is present, is preferably at most 10%, more preferably at most 5%, of the working surface of the sanding pad or the attachment surface opposite the abrasive.
  • the at least one dusty air channel extends at least partially or exclusively in the adhesive layer of the sanding pad and / or the backing layer of the abrasive.
  • the at least one dust air channel may be formed as a recess in the adhesive layer and / or the backing layer of the abrasive article.
  • the sanding pad body need not have a recess for the dust air channel.
  • a section of the at least one dust-air channel arranged or extending in a common plane with the dusty-air inlet to run exclusively in the adhesive layer of the sanding pad and / or the backing layer of the abrasive.
  • At least one further dust air channel runs in the sanding pad body.
  • the dusty air duct it is possible for the dusty air duct to extend over a first section in the adhesive layer and / or the counter-adhesion layer, and to be arranged in a further or second section in the sanding pad body.
  • the first section is connected to or opens into the at least one dust-air inlet.
  • the at least one dust air inlet expediently forms an input area or inlet of the first section of the dust air channel.
  • a recess is provided in the sanding pad body, which is aligned with a recess in the adhesive layer of the sanding plate or coincides with this, so that both recesses in cooperation form a dust air channel.
  • the dust-air channel running in the adhesive layer or counter-adhesive layer can optionally serve to introduce extraneous air into the plane of the adhesive layer or counter-adhesion layer, in order to avoid the formation of dust nests there.
  • the at least one dust air channel is formed in the adhesive layer or back adhesion layer, for example, by leaving material of the adhesive layer or backing layer by punching or cutting. It is also possible that, for example, by thermal processing, for example a melting process, Part of the adhesive layer or backing layer compressed or reshaped or thermally deformed or melted, so that the at least one dust air channel or flow channel is formed.
  • the at least one dust air duct is suitably covered by the abrasive when it is attached to the sanding pad.
  • the at least one dust air channel is designed or provided for covering by the abrasive.
  • the dust air channel is designed as a groove, which is covered by the abrasive.
  • the at least one dust air channel has, for example, a U-shaped or V-shaped cross section, also other cross sections, for example W-shaped or T-shaped or the like, are possible.
  • the abrasive covers the at least one dust air channel transversely to the main flow direction.
  • the abrasive forms a wall or side wall of the dust air channel, while other wall surfaces are provided by the sanding pad.
  • the dust air channel comes free, so that possibly accumulating dirt or dust can fall out there.
  • the dust air channel is virtually automatically cleaned by removing the abrasive. But it is also possible, for example, to blow out after removal of the abrasive from the sanding pad dust air duct.
  • the at least one dust air inlet of the at least one dust air channel is expediently provided on an outer circumference of the sanding plate next to the processing surface.
  • the at least one dust-air inlet of the at least one dust-air channel can also be provided on an inner periphery of an opening aligned with the drive holder on the machining side. It is understood that the combination is also possible, ie that a dust exhaust inlet or several dust air inlets are provided both on the outer circumference and on the aforementioned opening for the drive holder or in the drive holder.
  • the at least one dust air inlet on the outer circumference of the sanding pad or the arrangement of such dust air inlets on the outer circumference of the sanding pad has or have the advantage that dust from the environment of the sanding pad can be optimally sucked and conveyed away from the workpiece.
  • the dust-air inlet or the dust-air inlets at a central region of the sanding disk improves the removal of dust in the central area of the sanding pad, especially against the background that the sanding pad has a relatively low rotational speed or self-rotational speed in eccentric operation in its central area having.
  • dust air inlets and dust air ducts also on the outer circumference of the abrasive or on the inner circumference of an opening of the abrasive, in particular at equal angular intervals, which aligns with the drive holder of the sanding disk when it is arranged on the sanding pad.
  • the dust-air inlets or dust-air ducts are expediently in direct flow connection with flow-through openings of the abrasive, in particular with annular openings arranged annularly around the center of the abrasive.
  • the sanding pad and / or the abrasive means has an arrangement of a plurality of dust air inlets arranged on the respective outer circumference which communicate with dusty air channels or at least one dusty air channel which are in flow communication with the at least one outflow opening. It is preferred if in each case a single, but also, for example, in each case two or three dust-air inlets communicate with a respective outflow opening.
  • the dust air inlets are expediently arranged at equal angular intervals or equidistantly on the outer circumference of the sanding pad.
  • the same configuration may also be provided with respect to an opening provided with the drive bracket on the machining side of the sanding pad or abrasive article.
  • an opening provided with the drive bracket on the machining side of the sanding pad or abrasive article.
  • dust air inlets may be provided which are in fluid communication with the at least one outflow opening away from the abrasion layer.
  • not only a single discharge opening for the dust to the grinding machine is available.
  • at least two or more outflow openings are provided. It is preferred if a plurality of outflow openings are arranged in an annular manner around the drive holder on the machine side of the grinding plate.
  • reinforcing ribs of the sanding plate are provided between the outflow openings.
  • a suction channel of the suction channel arrangement extends between at least two, preferably three or more inflow openings and an associated outflow openings, which is provided for the extraction of the dust air by the hand-grinder.
  • the suction channel for example, has a substantially radial course.
  • the suction channel runs, for example, from the outer periphery in the direction of the drive holder.
  • the sanding pad and / or the abrasive means has an arrangement of several arranged on the respective outer circumference dust air inlets, which are provided in the adhesive layer of the sanding pad and / or the backing layer of the abrasive. It is preferred if such dust air inlets are provided exclusively in the adhesive layer of the sanding disk and / or the counter-adhesive layer of the abrasive.
  • the adhesive layer or the backing layer preferably has a recess.
  • the adhesive layer or counter-adhesive layer as such is preferably not designed as a dust-air inlet, ie a certain air-permeability of the adhesive layer or backing layer is not to be understood as a dust-air inlet in this sense.
  • a certain air-permeability of the adhesive layer or backing layer is not to be understood as a dust-air inlet in this sense.
  • the adhesive layer and / or the backing layer is a hook and loop or fiber layer is configured, forms their substance-specific inherent flow permeability expediently no dust air inlet or an arrangement of several dust air inlets.
  • the dust air inlet and / or the dust air channel or a section of the dust air channel communicating with the dust air inlet are advantageously designed as deformations and / or recesses of the material forming the adhesive layer or backing layer.
  • the at least one dusty air duct also expediently runs at least in sections radially and / or arcuately and / or crescent-shaped from an outer circumference of the sanding pad in the direction of the drive mount or from an inner circumference of an opening aligned with the drive mount in the direction of an outer circumference of the sanding pad.
  • the at least one dust air channel is sickle-shaped.
  • the sanding pad body is elastic and / or consists of an air-impermeable and / or impermeable to dust particles plastic.
  • the sanding pad body is made of foam.
  • the sanding pad body comprises or consists in a preferred embodiment of polyurethane foam, in particular a polyester-based elastomer foam and / or an aromatic PU elastomeric foam.
  • the sanding pad body is designed, for example, as a pad or cushion.
  • the sanding pad body itself preferably has on its outer circumference only in the region of the working surface or the plane of the working surface one or more dust-air inlets.
  • the sanding pad body does not consist of a fiber material or a knitted fabric. But it is also possible that the sanding pad body consists of such a material or it has.
  • the dust air duct is expediently formed or formed dedicated.
  • the dust air channel advantageously does not result randomly in that there is a fiber knit or a fibrous structure, wherein between the fibers Dusty air can flow.
  • a variant of the invention provides that the at least one dust air channel is produced by a targeted shaping or drilling of the fiber structure.
  • the fiber structure it is possible for the fiber structure to provide only one layer or layer of the sanding disk, while other layers or layers, in particular the adhesive layer or a layer of a foam, are provided for forming the dust air channel or its dust air inlet.
  • the at least one dust air channel has a flow cross section which is not penetrated by fibers and / or is limited by fibers.
  • the dust air duct does not extend, in particular not labyrinth-like, through a fiber network or a fiber material or a knitted fabric.
  • the adhesive layer or backing layer comprises a fibrous material, such as a suede, bounding a sidewall or side walls of the at least one dust air channel.
  • this fiber material extends only laterally along the dust air channel and does not extend into the dust air channel, so that the dust flow through the at least one dust air channel is not hindered by fibers.
  • the sanding pad body is arranged on a sanding pad carrier or sanding pad upper part, which or which has the drive holder.
  • the carrier or the upper part is, for example, plate-shaped.
  • the carrier or the upper part for example, have reinforcing ribs.
  • the reinforcing ribs for example, have a radial course away from the drive holder.
  • the carrier or the upper part for example, have a significantly higher flexural strength and / or a greater modulus of elasticity, for example at least twice or three times higher flexural strength or at least twice or three times higher modulus of elasticity than the sanding pad body.
  • the sanding pad body which may also be referred to as a pad or pad, is glued to the carrier or the sanding pad upper part, welded or otherwise firmly connected
  • the at least one dusty air channel has a closed inner circumference, at least when the abrasive material is arranged on the sanding pad.
  • the flow cross-sections dust air channel is thus limited by an at least substantially closed peripheral wall.
  • the peripheral wall may have a plurality of sections, for example wall sections provided by the sanding pad and / or by the abrasive.
  • a main body of the abrasive or abrasive sheet may provide a wall portion.
  • the base material of the sanding pad body for example a foam, can provide a wall section.
  • Side walls of the at least one dust air channel can be provided for example by the adhesive layer and / or the backing layer, for example by a Velcro layer or a layer of velor or both
  • the at least one dust air channel has a substantially constant flow cross section over its length between the dust air inlet and its outlet. But it is also possible that the cross-section or flow cross-section narrows or widens from the dust inlet to the outlet. However, it is preferably provided that the cross section or flow cross section of the at least one dust air channel runs continuously over its length.
  • the dust air duct at least partially has a flat, for example approximately rectangular, cross-section.
  • inlet openings or dust air inlets for the waste air are present on the sanding plate exclusively on the machining side and on an inner circumference or outer circumference which is angled on the machining side, while only the at least one dusty air outflow opening or several dusty air outflow openings are arranged on the machine side.
  • On the machine side so expediently no inflow or dust air inlets for the dust air or fresh air are provided.
  • a peripheral contour of the grinding plate and / or the abrasive is expediently circular or oval. But there is also the possibility that a peripheral contour of the sanding plate and / or the abrasive, for example, triangular, rectangular, in particular square, or otherwise polygonal. The sanding pad and the abrasive thus expediently have a matching to the respective grinding task or grinding peripheral contour.
  • the sanding pad has a per se EP 2 070 651 known basic conception such that a fresh air flow or stream of Schuström Kunststoff between the abrasive sheet or abrasive and the bottom of the sanding pad or the processing side of the sanding pad flows. This prevents the formation of dust nests between the abrasive and the sanding pad.
  • the sanding pad has at least one supply air duct or air inflow duct which has at least one inflow opening away from the processing surface, in particular on an outer circumference of the sanding disk and / or on an inner circumference of an opening communicating with the drive mounting on the processing surface, and at least one supply air Outflow opening on the processing surface, so that Sachström poverty can flow through the at least one inflow opening and can flow out of the at least one Zu Kunststoff-Ausströmö réelle to flow to form a Schuströmluftstroms between the abrasive and the sanding pad in the direction of dust air inlet openings. It is understood that a plurality of inlet openings and / or a plurality of supply air outflow openings can be provided, which are in flow communication with the at least one supply air duct.
  • the at least one supply air duct extends from an outer circumference of the sanding disk in the direction of a center, preferably into the center, the sanding disk.
  • a center preferably into the center, the sanding disk.
  • one or more star-shaped air ducts arranged around the center are present.
  • At least one supply air duct prefferably has an inflow opening arranged in the center of the sanding pad and an inflow opening arranged on the outer circumference of the sanding pad.
  • some of the air ducts have an inflow opening only on the outer circumference of the sanding disk, while other air ducts on the outer circumference and on the inner circumference or in the center of the sanding disk have an inflow opening.
  • a grinding machine 10 is for abrasive processing or grinding of a workpiece W, for example, a component or a body of an automobile, a wood workpiece or the like.
  • the grinding machine 10 has a drive motor 11 which drives a tool shaft 13 directly or via a gear 12, at the output 14a of which a tool holder 14 is arranged. Based on a drive switch 15, the drive motor 11 can be turned on and off, preferably also adjusted in terms of its speed. To set the speed but also a separate switch can be provided.
  • the drive motor 11 and the housing 12 are housed in a housing 16 from which a handle 10 for gripping by an operator protrudes.
  • a handle 10 for gripping by an operator protrudes a handle 10 for gripping by an operator protrudes.
  • an elongate handle bar or handle in particular in one embodiment of a grinding machine can be provided as a wall and / or ceiling grinder.
  • the drive motor 11 is preferably an electric drive motor, wherein compressed air motor is readily possible.
  • the transmission 12, which includes, for example, an eccentric shaft, for example, has a drive portion 18 from which the handle 17 protrudes. Furthermore, a supply connection 19 for connecting a supply line 20, for example a compressed air hose and / or an electric line (depending on the drive concept of the drive motor 11), is provided on the housing 12.
  • an outlet section 21 also protrudes from the drive section 18, through which a dust removal channel 22 extends.
  • a dust removal port 23 for connection for example, a suction line 24, in particular a suction tube, is provided.
  • the suction line 24 leads, for example, to a vacuum cleaner, not shown in the drawing.
  • the suction line 24 expediently forms part of a suction device 25 for extracting dust from a surface of the workpiece W.
  • a dust collecting container for example a sack or bag, can of course also be provided at the dust removal connection 23.
  • a grinding tool 30 for example, in a rotational and / or oscillating and / or hypercycloid grinding movement can be driven.
  • a machine side 31 of the grinding tool 30 is fixed to the grinding machine 10 or facing the grinding machine 10, while a machining side 32 is associated with the workpiece W.
  • the grinding tool 30 has on the machine side 31 a drive holder 33 for the tool holder 14 on the
  • the drive holder may for example comprise a threaded pin or a mounting pin, which is connectable to a corresponding tool holder of the grinding machine.
  • the grinding machine 10 itself as a tool holder 14 has a pin or fastening projection, which engages in a corresponding receptacle 34 of the drive holder 33.
  • the drive bracket 33 includes bayonet contours or the like.
  • the very specific embodiment of the drive holder 90 is not important. It merely ensures that the grinding tool 30 is rotatably connected to the tool shaft 13, so that the driving force of the drive motor 11 can be transferred to the grinding tool 30.
  • the grinding tool 30 includes a sanding pad 40 to which an abrasive 80 is releasably secured.
  • a machine side 41 of the grinding plate 40 is provided with the drive holder 33.
  • the sanding pad 40 has a working surface 42 which, for example, has a circular peripheral contour.
  • a sanding pad having a structure similar to sanding pad 40 to have, for example, a triangular or rectangular outer peripheral contour.
  • the sanding pad 40 has an adhesive layer 65, for example with hook and loop, to which the abrasive 80 with its matching backing layer 82 is releasably attachable.
  • the backing layer 82 is for example made of a textile material, in particular suede.
  • the counter adhesion layer 82 is arranged, for example, on a sheet-like basic body 92, for example made of paper or a textile fabric. However, it would also be possible for the counter-adhesion layer 82 to directly form the main body for an abrasion layer 81.
  • the abrasion layer 81 like other abrasion layers of abrasives which can be used or inventively used according to the invention, has, for example, a grain or a sanding knit.
  • the abrasion layer 81 and the back adhesion layer 82 are provided on opposite sides of the base body 91.
  • the abrasive 80 which is designed, for example, as an abrasive sheet 90, has a plurality of discharge openings 84-88 for waste air S, is sucked with the resulting during grinding of the workpiece W dust or produced during grinding of the workpiece W.
  • the flow-through openings 84-88 are arranged, for example, in concentric circles.
  • the flow-through openings 84 and 88 are provided, for example, along a radially outer circle with respect to the drive holder, the through-flow openings 87 along a radially inner circle with respect to the drive holder. Between these circular lines are two circular lines with further radii, along which the through-flow openings 85, 86 are arranged.
  • a row arrangement of flow-through openings 84, 85, 86, 87 is arranged along a radial line.
  • the distances of the flow-through openings 84-87 to one another are expediently approximately the same.
  • the flow-through openings 84-88 are expediently distributed substantially uniformly over the surface of the abrasion layer 81.
  • a flow opening 84 is arranged between each two flow openings 88.
  • the flow-through openings 84 and / or 86 have a larger flow cross-section or diameter than the flow-through openings 85, 87, 88.
  • the flow-through openings 84-88 are preferably circular, but could also have any other cross-sectional geometry, for example triangular or otherwise polygonal.
  • the circular lines with the flow openings 84-88 extend around a central opening 89, which is aligned with the drive holder 33 of the grinding tool 30.
  • the drive holder 33 is also accessible from the processing surface 42 forth.
  • the central opening 89 is also suitable for the extraction of dust dust S, which will become clear later.
  • inlet openings 44-48 are provided on the sanding pad 14, matching the throughflow openings, through which the dusty air S can flow into the sanding pad 40, namely into a suction channel arrangement 78 of the sanding pad 40.
  • a hole pattern of the flow-through openings 44-48 and the flow-through openings 84-88 is preferably identical, so that they are aligned with each other.
  • the inflow openings 44 are arranged along a radially outer circular line around the drive holder 33 or the center of the grinding plate 40. They correspond to the flow openings 84 and are assigned to these.
  • An inflow opening 44 is in each case arranged between inflow openings 48, which lie on the same circular lines as the inflow openings 44, but have a smaller cross-section than the inflow openings 44.
  • the suction channel arrangement 78 comprises suction channels 75 which each open out in an outflow opening 50 on the machine side 41 of the grinding plate 40.
  • the suction channels 75 each comprise a main channel 76, which communicates with the inlet openings 44, 45, 46, 47. From the main channel 76 branch branch channels 77, which are fluidly connected to the inlet openings 48. Thus, dust dust S can flow from the inflow openings 44-48 to an associated outflow opening 50 via a respective suction channel 75.
  • the outflow openings 50 are annular, expediently arranged at equal intervals around the drive holder 33.
  • the outflow openings 50 are arranged on the machine side 31, 41.
  • the discharge openings 50 are located in a suction region 26 of the suction device 25 of the grinding machine 50, so that the waste air S from the workpiece W passes through the through-flow openings 84-88, the inlet openings 44-48 and the suction channel arrangement 78 to the outflow openings 50 and continue to flow into the suction line 24 can.
  • an effective dust extraction from below the abrasion layer 81 resulting dust is possible.
  • an opening 49 In the center of the grinding plate 40 is an opening 49 through which the drive holder 33 is accessible.
  • the opening 49 is aligned or coincident with the opening 89 when the abrasive 80 is attached to the sanding pad 40.
  • the inflow openings 44-48 and preferably all or substantially the suction channel arrangement 78 are expediently formed in a sanding pad body 57.
  • the sanding pad body 57 comprises, for example, a foam body 58.
  • the sanding pad body 57 is elastically yielding and in any case more flexible than a sanding pad backing 51, which could also be referred to as a sanding pad upper part, on which the outflow openings 50 are provided.
  • the sanding pad carrier 51 stabilizes the sanding pad 40, so to speak.
  • the carrier 51 has a plate portion 52, which, however, has a smaller diameter or a smaller cross-sectional area than the processing surface 42.
  • an outer peripheral surface 59 of the grinding plate body 57 providing the outer peripheral surface 43 projects radially outwardly from an edge or outer periphery 54 of the plate portion 52 in front.
  • a relatively soft, not stiffened by the carrier 51 edge region of the sanding pad body 57 is provided, which in itself is known.
  • the sanding pad carrier 51 has an upwardly projecting in front of the plate portion 52 elevation 55, in which the drive holder 33 is provided.
  • an insert part 56 is arranged, in particular embedded or encapsulated, which has the drive holder 33.
  • the insert 56 is made of metal, for example, while the sanding pad support 51 may consist of a plastic material.
  • the sanding pad support 51 is reinforced by ribs 53, which extend away from the elevation 55 radially outward in the direction of the outer circumference 54 of the plate portion 52. Expediently, in each case one outflow opening 50 is arranged between two ribs 53.
  • the portion 55 of the grinding disc 50 having the elevation 55 protrudes into the suction region 26 of the grinding machine 10, so that the outflow openings 50 are arranged there and the dust dust S can be effectively sucked off the grinding plate 40.
  • the dusty air S flows along a main flow direction H into the flow-through openings 84-88.
  • the dust air inlets 62 are thus provided radially outward with respect to the center of the sanding pad 40 or with respect to the drive mount 33, so that scrubbing air S is sucked from the surroundings of the sanding pad 40 in the direction of the sanding pad 40, expediently in a transverse flow direction Q transverse to the main flow direction H.
  • the dust-air inlets 62 are provided on dust-air ducts 61, which are directly in fluid communication with the inlet openings 88 provided radially on the outside of the sanding pad 40.
  • the dust air S can flow from the outside in the direction of the grinding tool 30 or the grinding plate 40 and does not pass between the workpiece W and the abrasion layer 81, but is sucked between the abrasion layer 81 and the machine side 31 of the grinding tool 30.
  • the dust air channels 61 have, for example, a crescent-shaped or curved course. It is understood that other courses are possible, For example, an approximately rectilinear or radial course of a schematically in FIG. 6 indicated dust air channel 261.
  • the curvature of the dust air channels 61 may be provided against a typical direction of rotation or in the direction of a typical direction of rotation of the grinding tool 30.
  • Further dust air inlets 64 are provided on the inner circumference of the opening 49 and communicate via dust air ducts 63 with inflow openings 47a of the inflow openings 47. Between each two inflow openings 47a, to which a dusty air duct 63 leads, an inflow opening 47b is provided, leads to the no dust air channel. As a result, it is possible, for example, for the dust air ducts 63 to have a relatively large cross section similar to the dust air ducts 61, which promotes effective dust extraction.
  • the dust air channels 61, 63 are preferably formed by the adhesive layer 65 having corresponding recesses.
  • recesses in particular grooves, can also be provided directly on the foam body 58 or sanding pad body 57 for forming the dust air channels 61, 63.
  • the adhesive layer 65 is formed by a punch body or a body made by cutting.
  • the adhesive layer 65 is adhered to the sanding pad body 57, for example.
  • the sanding pad body 57 it is also possible for the sanding pad body 57 to be injection-molded or otherwise molded onto a bonding layer layer 67 having the adhesive layer 65.
  • the adhesive layer layer 67 for example a Velcro layer, is placed in an injection mold in which the sanding pad body 57 or the foam body 58 is then injection-molded onto the adhesive layer layer 67.
  • the adhesive layer 65 does not extend to the radial outer periphery 68 of the grinding plate 40.
  • an edge 66 of the sanding pad body 57 without adhesive layer 65 is provided.
  • the edge 66 is relatively narrow. Recesses for the dust air channels 61 may be formed on the edge 66.
  • a rear ventilation arrangement 70 which counteracts the formation of dust nests between the working surface 42 of the grinding disc 40 and the abrasive 80, comprises, for example, inflow openings 71, which are flow-connected via supply air channels 73, 73b to supply air outflow openings 72.
  • the supply air ducts 73 furthermore have an inflow opening 74 on the inner circumference of the opening 49, so that, as it were, supply air F can flow into the supply air ducts 73 from radially outside and radially inside.
  • the supply air ducts 73b have only the inflow opening in 71.
  • the inflow openings in 71, 73 are closer to the machine side 41, 31 of the grinding tool 30 or the grinding plate 40 than the dust-air inlets 62, 64. Thus, with less dust-laden supply air F in the supply air ducts 73, 73b.
  • the supply air F flows out of the supply air ducts 73, 73b via supply air outflow openings 72 into the intermediate space between the sanding pad 40 and the abrasive 80, that is to say into the connection plane between the back adhesion layer 82 and the adhesive layer 65. From there, the supply air F is conveyed via the inlet openings 44. 48 is sucked off again, so that eventually between the adhesive layer 65 and the backing layer 82 accumulating dust is effectively removed.
  • the sanding pad 140 has substantially the same basic structure again sanding pad 40, so far as the same reference numerals are used. For example, the already explained inlet openings 44-48 are present.
  • the abrasive 180 substantially corresponds to the abrasive 80, so also has the components already explained, for which the same reference numerals are used.
  • the arrangement of the dust air inlets and the dust air channels to the intake of dust dust S from the environment of the sanding pad 140 and the abrasive 180 taken differently, namely such that the abrasive 180 dust air channels 161, which are in flow communication with the flow-through openings 88 directly and on the side of the counter-adhesive layer 182.
  • the dust air ducts 161 and 61 could be provided cooperatively, which provides a correspondingly larger flow cross section for the dust air S.
  • the dust air passages 161 do not run on the abrasion layer 81 of the abrasive 180, but in the region of the backing layer 182.
  • the backing layer 182 has, for example, recesses or grooves for forming the dust air passages 161, which have dust exhaust intakes 162 at the outer edge region 83 of the abrasive.
  • dust-laden air S can flow in the direction of the outflow openings 50 away from the abrasion layer 81, similar to the dust-air inlets 62.
  • the dust air channels 63 could also be provided to replace or supplement the dust air channels 63 radially inwardly corresponding dust air channels on the abrasive 180, which is preferably designed as an abrasive sheet 190.
  • the dust air channels 63 are formed, so that the abrasive 180 in the region of the opening 89 does not have to have dust air channels.
  • a dust air inlet and / or a dust air channel can also be arranged outside the adhesive layer of a sanding plate.
  • a dust exhaust inlet 362 is disposed on the outer circumferential surface 59 of the sanding pad body 57.
  • the dust air inlet 362 leads to a dusty air duct 361, which runs through the sanding pad body 57 and opens directly into the suction channel 75.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
EP16206563.5A 2016-01-04 2016-12-23 Plateau de meule et abrasif Active EP3187305B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102016100072.8A DE102016100072A1 (de) 2016-01-04 2016-01-04 Schleifteller und Schleifmittel

Publications (3)

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EP3187305A2 true EP3187305A2 (fr) 2017-07-05
EP3187305A3 EP3187305A3 (fr) 2017-11-22
EP3187305B1 EP3187305B1 (fr) 2021-09-22

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DE (1) DE102016100072A1 (fr)

Cited By (4)

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Publication number Priority date Publication date Assignee Title
EP3542961A1 (fr) * 2018-03-23 2019-09-25 HILTI Aktiengesellschaft Support pour produit abrasif
WO2019219779A1 (fr) * 2018-05-16 2019-11-21 Festool Gmbh Machine-outil mobile d'usinage d'une surface
CN112571285A (zh) * 2021-01-07 2021-03-30 南京客络超商贸有限公司 一种可清除磨屑的内孔磨削设备
DE102021209532A1 (de) 2021-08-31 2023-03-02 Tts Microcell Gmbh Schleifteller für ein Schleifgerät und Schleifsystem

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Publication number Priority date Publication date Assignee Title
DE102020105572A1 (de) * 2020-03-02 2021-09-02 Festool Gmbh Schleifteller mit einem Dichtungselement und einer Rippenstruktur sowie Schleifmaschine

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JPH07237131A (ja) * 1994-03-01 1995-09-12 Hiroaki Yasuda 研磨材装着用パッド
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DE29613570U1 (de) * 1996-08-06 1996-09-19 Wiemann Martin Schleif- oder Polierteller, insbesondere für Exzentermaschinen
JP5394393B2 (ja) * 2007-12-31 2014-01-22 サンーゴバン アブレイシブズ，インコーポレイティド 研磨用品と補助工具との間に使用される接合パッド
DE202008001473U1 (de) * 2008-02-01 2008-06-26 Storm Pneumtic Tool Co., Ltd., Dali City Schleifscheibe
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EP2070651A1 (fr) 2007-12-11 2009-06-17 Festool GmbH Plateau de meule et disque abrasif
EP2070651B1 (fr) 2007-12-11 2010-06-09 Festool GmbH Plateau de meule et disque abrasif

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3542961A1 (fr) * 2018-03-23 2019-09-25 HILTI Aktiengesellschaft Support pour produit abrasif
WO2019179847A1 (fr) * 2018-03-23 2019-09-26 Hilti Aktiengesellschaft Fixation de moyen à meuler
WO2019219779A1 (fr) * 2018-05-16 2019-11-21 Festool Gmbh Machine-outil mobile d'usinage d'une surface
CN112571285A (zh) * 2021-01-07 2021-03-30 南京客络超商贸有限公司 一种可清除磨屑的内孔磨削设备
DE102021209532A1 (de) 2021-08-31 2023-03-02 Tts Microcell Gmbh Schleifteller für ein Schleifgerät und Schleifsystem
WO2023030999A1 (fr) 2021-08-31 2023-03-09 Tts Microcell Gmbh Disque de broyage pour un dispositif de broyage et système de broyage

Also Published As

Publication number Publication date
EP3187305B1 (fr) 2021-09-22
EP3187305A3 (fr) 2017-11-22
DE102016100072A1 (de) 2017-07-06

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