WO2012034785A1 - Meule - Google Patents

Meule Download PDF

Info

Publication number
WO2012034785A1
WO2012034785A1 PCT/EP2011/063468 EP2011063468W WO2012034785A1 WO 2012034785 A1 WO2012034785 A1 WO 2012034785A1 EP 2011063468 W EP2011063468 W EP 2011063468W WO 2012034785 A1 WO2012034785 A1 WO 2012034785A1
Authority
WO
WIPO (PCT)
Prior art keywords
grinding wheel
hole
suction holes
suction
center
Prior art date
Application number
PCT/EP2011/063468
Other languages
German (de)
English (en)
Inventor
Roman Zaech
Peter Eggenberger
Original Assignee
Robert Bosch 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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Priority to US13/822,752 priority Critical patent/US20130344783A1/en
Priority to EP11745747.3A priority patent/EP2616217A1/fr
Publication of WO2012034785A1 publication Critical patent/WO2012034785A1/fr

Links

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
    • 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
    • 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
    • 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 circular grinding wheel having a plurality of suction holes according to the preamble of claim 1.
  • Such grinding wheels are also known as “multi-hole grinding wheels”.
  • grinding wheel extraction holes are known for a long time, which penetrate the grinding surface. Through these suction holes through the grinding dust can be removed. These grinding wheels can be attached to sanding plates, which also identify corresponding suction holes. This removal is particularly effective when the sanding dust is actively sucked by generating a negative pressure in the sanding pad.
  • Such generic grinding wheels are known for example from EP 1 977 858 AI.
  • the grinding wheels disclosed there have a plurality of suction holes, through which the dust can be sucked. Due to the special arrangement of the suction holes (the so-called "hole pattern"), it is possible to suck off the grinding dust almost independently of the relative rotational position between the grinding wheel and the sanding pad
  • Further generic grinding wheels with other hole patterns are known, for example, from WO 2008/042775 A1, where a Arrangement of the suction holes at the vertices of a Triangle grid is described, or from EP 781 629 AI, where the suction holes are arranged at the vertices of a square grid.
  • the hole pattern should simultaneously meet a variety of criteria.
  • the total area of all suction holes should be large enough for suction to take place at all.
  • the total area of all suction holes may not be too large, so that sufficient abrasive grain can be arranged on the remaining grinding surface to ensure material removal at all.
  • the grinding wheel can be attached to as many different grinding plates as possible, the hole pattern of which can vary greatly from provider to provider. There should always be sufficient overlap between the extraction holes of the grinding wheel and those of the sanding plate.
  • the suction power be substantially independent of the relative rotational position between the grinding wheel and the sanding pad; the user no longer has to laboriously bring the suction holes of the grinding wheel and grinding disc into line.
  • the distance between the holes on the one hand should not be too large, otherwise no uniform suction is possible.
  • the distance between the suction holes must not be too small, since the grinding wheel could otherwise lose its stability and could break or tear, for example, at the webs between the suction holes.
  • a circular grinding wheel having a center and a plurality of, in particular, circular suction holes.
  • the grinding wheel may have in its center a particular circular attachment opening.
  • the center is to be understood only as an imaginary reference point, from which the geometric arrangement of the suction holes described below is defined.
  • the center of the grinding wheel is understood to be the geometric center of the circular circumference of the grinding wheel.
  • Each suction hole is assigned its own center. This center is also an imaginary reference point of the grinding wheel, which corresponds to the geometric center of gravity of the suction hole. For example, if the suction hole is circular, its center coincides with the geometric center of the circle that forms the edge of the suction hole.
  • the center of each suction hole on the one hand defines a beam emanating from the center of the grinding wheel, on which the center of the suction hole lies.
  • the center of the suction hole defines a circle of holes concentric with the center of the grinding wheel and on which lies the center of the suction hole. The center of the suction hole is then on the intersection of the beam with the bolt circle.
  • the arrangement of the suction holes is characterized by the following properties: First, only the center of a single suction hole is arranged on at least one of the rays emanating from the center. Such a beam is referred to here and below as a single-hole beam.
  • the centers of all suction holes, which are arranged on a single-hole jet should lie substantially on a common single-hole circle with the same radius. Consequently, they are all substantially the same distance from the center of the grinding wheel.
  • the phrase "essentially” means in that the distances of the centers of the suction surface from the center of the grinding wheel differ from each other by at most half a diameter of the individual suction holes.
  • the above characteristic does not exclude that on the single-hole circle are also the centers of suction holes, which are not arranged on a single-hole jet. At least one of the suction holes on the single-hole circle must lie on a single-hole jet at the same time.
  • each beam should have the center of a suction hole at at least one radius, at which radius the two beams adjacent to this beam in the circumferential direction do not have a center point of a suction hole.
  • the combination of these features leads to a particularly good compromise between suction and uniformity, independence from the hole pattern of the sanding pad and the positioning and stability of the Schleiusion.
  • the arrangement of the suction holes which lie both on a single-hole jet and on the single-hole circle, ensures, for example, that the suction holes are circumferentially offset from each other.
  • a relatively uniform arrangement of the suction holes is achieved without the suction holes must be too close together to reduce the stability of the grinding wheel.
  • the removal rate ie the amount of material removed from a machined surface during grinding per time
  • the surface roughness of the machined surface remained virtually unchanged.
  • the number of circles whose radius is smaller than the radius of the one-hole circle in the range of 2 to 5.
  • the one-hole circle is the third smallest, fourth smallest, fifth smallest or sixth smallest radius
  • the number of circles whose radius is smaller than the radius of the single-hole circle 3 or 4.
  • this type of jet indicates the totality of the radii at which the center of a suction hole is arranged on this jet.
  • a jet type could be characterized by having a first hole at the smallest radius, a second hole at the third smallest radius, and a third hole at the fifth smallest radius.
  • the grinding wheel preferably has at most 5, preferably at most 4, more preferably at most 3, particularly preferably exactly 3 different types of jet.
  • One of these beam types is always the beam type of single-hole beams. Since, according to the invention, the centers of all the suction holes arranged on a single-hole jet lie substantially on a common single-hole circle, the grinding disk contains only a single single-hole jet type. The other types of jet always contain at least the centers of two suction holes as a result of the properties of the invention.
  • At most 6, preferably at most 4, more preferably at most 3 centers of suction holes are arranged on each jet. In this way it can be ensured that the distances of the suction holes are large enough from one another to ensure the stability of the grinding wheel.
  • the center of at least 3 suction holes are arranged on each beam which is not a single-hole jet. In other words, there are no jet types that contain exactly two suction holes. This leads to the grinding wheel containing a sufficient number of suction holes.
  • the number of all suction holes is in the range from 20 to 100, preferably from 30 to 80, particularly preferably from 40 to 64. This provides a good compromise between high and uniform suction and simultaneous stability of the grinding wheel.
  • the number of jets containing at least one center of a suction hole is advantageously in the range of 10 to 50, preferably between 20 and 30 and is particularly preferred 24.
  • a smaller number of jets would mean an accumulation of the suction holes in certain areas of the grinding wheel, which would lead to uneven suction.
  • a larger number of jets would result in a high density of the suction openings, which would reduce the stability of the grinding wheel.
  • the number of hole circles, on which the center of at least one suction hole is arranged in the range of 3 to 10, preferably from 4 to 8, particularly preferably from 4 to 6. Too small a number of bolt circles would lead to an uneven suction along lead the radial direction. Too large a number, however, would entail a loss of stability in the radial direction.
  • the radii of the hole circles are distributed substantially uniformly over the radius of the entire grinding wheel.
  • the smallest radius of a lock circle can be between 15% and 35%, preferably between 20% and 30% of the radius of the grinding wheel.
  • the largest radius of a lock circle can be between 70% and 90%, preferably between 75% and 85% of the radius of the grinding wheel.
  • the average absolute deviation of the radial distances of each two adjacent hole circles can be used. Preferably, this mean absolute deviation is less than 30%, preferably less than 15% of the mean radial distance between two adjacent bolt holes.
  • the average number of suction holes whose centers lie on a jet is preferably in the range from 1.2 to 3, preferably from 1.4 to 2.85, particularly preferably from 1.6 to 2.7. A smaller average number would result in nonuniform suction along the radial direction, while a larger average number would decrease the stability of the grinding wheel.
  • the average number of suction holes is preferably in the range from 6 to 20, preferably from 8 to 15, particularly preferably from 10 to 12.5.
  • a smaller average number would result in non-uniform suction along the circumferential direction, while a larger average number would decrease the stability of the grinding wheel.
  • the ratio of the total area of all suction holes to the total surface of the grinding wheel determines, on the one hand, the effect of the suction and, on the other hand, the stability of the grinding wheel.
  • this ratio is in the range from 2% to 20%, preferably from 6% to 12%, more preferably from 4% to 7%.
  • the total area of the grinding wheel includes both the actual grinding surface on which the abrasive grains are applied and the total area of all the suction holes. If the grinding wheel has a central attachment opening, however, its area is not added to the total area of the grinding wheel. Thus, if the grinding wheel has a diameter D and if it has a central, circular attachment opening with a diameter b, then the total area of the grinding wheel is calculated by
  • At least 80%, preferably at least 90%, particularly preferably all suction holes are circular and have a diameter ranging from 3 mm to 6 mm, preferably from 3.5 mm to 4.5 mm, particularly preferably from 4 mm to 5 mm. With such diameters, a particularly good suction could be achieved.
  • the centers of at least 8 suction holes are arranged on each bolt circle, preferably of exactly 8 suction holes or exactly 16 suction holes.
  • the suction holes are arranged uniformly in the circumferential direction on each bolt circle. If a bolt circle contains, for example, 8 suction holes, then two suction holes arranged on the hole circle and adjacent to one another in the circumferential direction are arranged at an angular distance of 45 ° from one another.
  • the arrangement of the suction holes is not substantially translucent symmetrical.
  • An arrangement is referred to as translationally symmetric if it is converted into itself by a linear displacement.
  • the phrase "substantially” means that the arrangement can not be completely self-transposed due to the finite number of suction holes in the peripheral areas of the grinding wheel due to such translation
  • the arrangement at the vertices of a square grid (as in EP 781 629 AI) or at the vertices of a triangular grid (as in WO 2008/042775 AI).
  • the grinding wheel may contain any known backing, for example paper or vulcanized fiber.
  • the suction holes can be produced for example by punching in the documents.
  • the abrasive grain may be any known per se, for example alumina, silicon carbide or silicon nitride.
  • the abrasive grains may have conventional grain sizes, eg P80, P180, P240 or P400.
  • the abrasive grain can be fixed to the substrate with a binder which is also known per se.
  • the grinding wheel may have on its back side (i.e., on the side facing away from the abrasive grain) further attachment means for attachment to a sanding pad.
  • these may be loops and / or hooks of a loop-hook connection, ie a Velcro connection.
  • the fastening means are formed by a coating with a pressure-sensitive adhesive.
  • Figure 1 a first embodiment of an inventive
  • Figure 2 a second embodiment of an inventive
  • Figure 3 a third embodiment of an inventive
  • Figure 4 a fourth embodiment of an inventive
  • Figure 5 a fifth embodiment of an inventive
  • Figure 6 a sixth embodiment of an inventive
  • the grinding wheel 1 includes an imaginary center M, which represents the geometric center of the circular outer periphery 4 of the grinding wheel 1.
  • the suction holes 2 are arranged uniformly in each case in the circumferential direction: on the hole circles Ki, K 2 and K 4 , the suction holes 2 are thus arranged at an angular distance of 45 ° from each other, while the suction holes 2 on the hole circles K 3 and K 5 are arranged at an angular distance of 22.5 ° from each other.
  • the eight beams S 2 , S 5 , S 8 , Sn, S i4 , Si 7 , S 20 and S 23 each contain only the center of a single suction hole 2. These beams are therefore referred to as single-hole beams.
  • the total of 8 suction holes 2 on the single-hole beams are all on the same bolt circle K 4 and consequently all have the same distance from the center M of the grinding wheel 1.
  • the bolt circle is therefore referred to as a single-hole circle.
  • the three circle of holes Ki, K 2 and K 3 thus have smaller radii than the one-hole circle K 4 .
  • each jet S 1, S 24 has the center of a suction hole 2 at at least one radius, at which radius the two beams adjacent to this jet in the circumferential direction do not have a center point of a suction hole 2.
  • the jet Si at the radius R 2 contains the center of a suction hole 2, which therefore lies on the bolt circle K 2 .
  • the jet S 2 contains the center of a suction hole 2 at the radius r 4 , but the circumferentially adjacent beams Si and S 3 are not. This results in that the suction holes 2 are angularly offset from each other.
  • the suction holes 2 are arranged on the one hand relatively uniform and allow a relatively uniform suction.
  • the distances between the suction holes 2 are large enough to prevent cracking or breaking of the webs between adjacent suction holes 2.
  • the grinding wheel 1 contains exactly three types of jet Ti, T 2 and T 3 :
  • the jet type Ti contains only a single suction hole 2 at the radius r 4 and therefore forms a single-hole jet.
  • the jet type T 2 contains an exhaust hole 2 at the radii r 2 , r 3 and r 5
  • the jet type T 3 at the radii ri, r 3 and r 5 contains an exhaust hole 2.
  • Each of the beams Si, S 2 ,... Or each of the jet types Ti, T 2 , T 3 thus contains either exactly one or exactly three centers of suction holes 2.
  • the beam types are in the circumferential direction U in the order T 2 , Ti, T 3 , wherein this order is repeated eight times over the entire angular range of 360 °.
  • the angle between T 2 and Ti and between T 2 and Ti is 11.25 °, while between Ti and T 3 is 22.5 °.
  • the arrangement of the suction holes 2 is in rotation about the center M by 45 ° in itself, so has a loved opinion symmetry.
  • the grinding wheel 1 shown in Figure 1 has a total area
  • A - [(150 mm) 2 - (16 mm) 2 l «17470 mm 2 .
  • the ratio of the total area of all suction holes 2 to the total area A of the grinding wheel 1 is approximately
  • the fourth exemplary embodiment illustrated in FIG. 4 is a further modification of that shown in FIG.
  • it has only four bolt circles Ki, K 4 , their arrangement and radii corresponding to those in Figure 2.
  • the grinding wheel 1 shown in FIG. 4 does not contain a fifth pitch circle.
  • FIGS. 5 and 6 show further exemplary embodiments with 6 perforated circles Ki, K 6 and associated radii ri, r 6, respectively.
  • the jet type Ti contains only a single suction hole 2 at the radius r 5 and therefore forms a single-hole jet.
  • the jet type T 2 contains at the radii r 2 , r 4 and r 6 a suction hole 2, while the jet type T 3 at the radii ri, r 3 , r 4 and r 6 includes a suction hole 2.
  • Each of the beams Si, S 2 ,... Or each of the jet types Ti, T 2 , T 3 therefore contains exactly one, exactly three or exactly four centers of suction holes 2.
  • the beam types are in the circumferential direction U in the order T 2 , Ti , T 3 , this sequence being repeated eight times over the entire angular range of 360 °.
  • the angle between T 2 and Ti and between T 2 and Ti is 11.25 °, while between Ti and T 3 is 22.5 °.
  • the arrangement of the suction holes 2 is in rotation about the center M by 45 ° in itself, so has a loved Japanese symmetry.
  • the following table 2 summarizes the parameters for the embodiments described above:
  • the inventive grinding wheels allow an efficient removal of grinding dust.
  • the service life of the grinding wheel can thereby be significantly extended, so that the grinding wheels are consumed less quickly and therefore less often need to be replaced.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)

Abstract

L'invention concerne une meule circulaire (1) présentant un centre (M), comportant une pluralité de trous d'aspiration (2) notamment circulaires, le centre de chaque trou d'aspiration (2) étant disposé sur le point d'intersection d'une ligne radiale (S1, S2,...) s'étendant depuis le centre (M) de la meule (1) et d'un cercle à trous (K1, K2,...) de rayon (r1, r2,...) disposé concentrique par rapport au centre (M). Au moins une des lignes radiales (S1, S2,...) est une ligne radiale monotrou (Si1, Si2,...) sur laquelle est disposé le centre d'un seul trou d'aspiration (2). Les centres de tous les trous d'aspiration (2) disposés sur une ligne radiale monotrou (Si1, Si2,...) sont sensiblement situés sur un cercle monotrou commun (Ki) de rayon (ri). Chaque ligne radiale (Sj) comporte sur au moins un rayon (rj) le centre d'un trou d'aspiration (2). Sur ce rayon (rj), les deux lignes radiales (Sj-1, Sj+1) adjacentes à la ligne radiale (Sj) dans la direction périphérique ne présentent pas de centre d'un trou d'aspiration (2).
PCT/EP2011/063468 2010-09-13 2011-08-04 Meule WO2012034785A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US13/822,752 US20130344783A1 (en) 2010-09-13 2011-08-04 Grinding wheel
EP11745747.3A EP2616217A1 (fr) 2010-09-13 2011-08-04 Meule

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202010012502.2 2010-09-13
DE202010012502U DE202010012502U1 (de) 2010-09-13 2010-09-13 Schleifscheibe

Publications (1)

Publication Number Publication Date
WO2012034785A1 true WO2012034785A1 (fr) 2012-03-22

Family

ID=43123404

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2011/063468 WO2012034785A1 (fr) 2010-09-13 2011-08-04 Meule

Country Status (4)

Country Link
US (1) US20130344783A1 (fr)
EP (1) EP2616217A1 (fr)
DE (1) DE202010012502U1 (fr)
WO (1) WO2012034785A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013212598A1 (de) * 2013-06-28 2014-12-31 Robert Bosch Gmbh Haltevorrichtung für ein Schleifmittel
GB2515764A (en) * 2013-07-02 2015-01-07 3M Innovative Properties Co Abrasive article and adapter therefore
DE102013017962A1 (de) * 2013-11-11 2015-05-13 Dipl.-Ing. Günter Wendt GmbH Verbessertes Vulkanfiber-Schleifwerkzeug
WO2015067377A1 (fr) 2013-11-11 2015-05-14 Dipl.-Ing. Günter Wendt GmbH Outil abrasif à fibres vulcanisées
CN106670973B (zh) * 2017-02-22 2019-01-18 天润曲轴股份有限公司 磨床冷却排屑装置
DE102018131590A1 (de) * 2018-12-10 2020-06-10 Dongguan Golden Sun Abrasives Co., Ltd. Scheibenschleifpapier und Schleifgerät
IT201900001286U1 (it) * 2019-04-15 2020-10-15 Alesia Inc S R L Dispositivo abrasivo di forma circolare

Citations (6)

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Publication number Priority date Publication date Assignee Title
US3353308A (en) * 1963-06-04 1967-11-21 Zane Riccardo Flexible abrasive disc
EP0781629A1 (fr) 1995-12-29 1997-07-02 Peter Jöst Elément abrasif adaptable directement ou indirectement à une machine ou à un support d'abrasif actionné manuellement ainsi qu'un adaptateur approprié
US20030092369A1 (en) * 2001-11-13 2003-05-15 Miksa Marton Orbital sander with suction ring
US20080081546A1 (en) * 2006-09-29 2008-04-03 3M Innovative Properties Company Dust vacuuming abrasive tool
EP1977858A1 (fr) 2007-04-02 2008-10-08 UFI Schleiftechnik GmbH & Co. KG Système de rectification
WO2009088772A2 (fr) * 2007-12-31 2009-07-16 Saint-Gobain Abrasives, Inc. Tampon d'interface destiné à être utilisé entre un article abrasif et un outil de support

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Publication number Priority date Publication date Assignee Title
US2749681A (en) * 1952-12-31 1956-06-12 Stephen U Sohne A Grinding disc
US5309682A (en) * 1990-03-28 1994-05-10 Robert Bosch Gmbh Hand held power tool with working disc
US5807161A (en) * 1996-03-15 1998-09-15 Minnesota Mining And Manufacturing Company Reversible back-up pad
DE19707445A1 (de) * 1997-02-25 1998-08-27 Hilti Ag Topfförmige Schleifscheibe
US5989112A (en) * 1998-05-11 1999-11-23 Norton Company Universal abrasive disc
US6942549B2 (en) * 2003-10-29 2005-09-13 International Business Machines Corporation Two-sided chemical mechanical polishing pad for semiconductor processing
US7252694B2 (en) * 2005-08-05 2007-08-07 3M Innovative Properties Company Abrasive article and methods of making same
USD645065S1 (en) * 2008-05-22 2011-09-13 3M Innovative Properties Company Abrasive article with holes

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3353308A (en) * 1963-06-04 1967-11-21 Zane Riccardo Flexible abrasive disc
EP0781629A1 (fr) 1995-12-29 1997-07-02 Peter Jöst Elément abrasif adaptable directement ou indirectement à une machine ou à un support d'abrasif actionné manuellement ainsi qu'un adaptateur approprié
US20030092369A1 (en) * 2001-11-13 2003-05-15 Miksa Marton Orbital sander with suction ring
US20080081546A1 (en) * 2006-09-29 2008-04-03 3M Innovative Properties Company Dust vacuuming abrasive tool
WO2008042775A1 (fr) 2006-09-29 2008-04-10 3M Innovative Properties Company Outil abrasif aspirateur de poussière
EP1977858A1 (fr) 2007-04-02 2008-10-08 UFI Schleiftechnik GmbH & Co. KG Système de rectification
WO2009088772A2 (fr) * 2007-12-31 2009-07-16 Saint-Gobain Abrasives, Inc. Tampon d'interface destiné à être utilisé entre un article abrasif et un outil de support

Also Published As

Publication number Publication date
DE202010012502U1 (de) 2010-11-18
EP2616217A1 (fr) 2013-07-24
US20130344783A1 (en) 2013-12-26

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