EP3892421A1 - Tampon de broyage, corps de support de tampon de broyage et meule - Google Patents

Tampon de broyage, corps de support de tampon de broyage et meule Download PDF

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Publication number
EP3892421A1
EP3892421A1 EP20168509.6A EP20168509A EP3892421A1 EP 3892421 A1 EP3892421 A1 EP 3892421A1 EP 20168509 A EP20168509 A EP 20168509A EP 3892421 A1 EP3892421 A1 EP 3892421A1
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EP
European Patent Office
Prior art keywords
grinding
grinding wheel
carrier body
carrier
grinding pad
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
EP20168509.6A
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German (de)
English (en)
Other versions
EP3892421B1 (fr
Inventor
Michael Schulze
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VK Investment GmbH
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VK Investment GmbH
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Publication date
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Publication of EP3892421A1 publication Critical patent/EP3892421A1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
    • B24D5/06—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor with inserted abrasive blocks, e.g. segmental

Definitions

  • the present invention relates to a grinding wheel, to a grinding pad for such a grinding wheel (such as a sintered diamond impregnated grinding pad), and to a grinding wheel carrier body for supporting such a grinding pad.
  • EP 1629 944 discloses a drum grinding wheel with an elongated drum configured for coaxial engagement with a spindle of a grinding machine.
  • a plurality of removable cutters are removably fastened to the exterior surface of the drum, each cutter having a plurality of ribs disposed in spaced relation thereon.
  • An abrasive grain is disposed on a grinding face of each of the ribs.
  • DE 197 53 618 discloses a grinding disk with a carrier disk with radial projections set uniformly around it, on which segments of grinding material (e.g. diamond grains in metal binder) are sintered to project above the grinder layer. Recesses are formed at the sides between the segments. The recesses have sectors filled with grinding material located alternately on the outside and inside over part of their extent.
  • grinding material e.g. diamond grains in metal binder
  • EP 2 335 877 discloses a grinding wheel with a working direction of rotation.
  • the wheel includes grinding lamellae with front, rear, inner and outer edges.
  • the front edge leads from the inner edge to the outer edge
  • the rear edge leads from the inner edge to the outer edge
  • the front edge intersects the outer edge in a front outer corner and the inner edge in a front inner corner
  • the rear edge intersects the outer edge in a rear outer corner and the inner edge in a rear inner corner.
  • the invention provides a grinding pad, comprising:
  • a first portion of the grinding pad outer surface e.g. the vertex where the left side of the grinding pad outer surface meets the leading face
  • a second portion of the grinding pad outer surface e.g. the vertex where the right side of the grinding pad outer surface meets the leading face
  • the grinding pad inner surface may be configured for attachment to a detachable portion of the wheel (such as a grinding pad carrier body).
  • the grinding pad may be, for example, a sintered, abrasive impregnated grinding pad, in some embodiments including diamond, such as in a ceramic or polymeric matrix.
  • the grinding pad outer surface has a leading edge that is a geodesic (though other shapes are envisaged). As a result, the leading edge and hence the outer surface would encounter a large flat workpiece at a uniformly oblique angle.
  • the grinding pad outer surface has a trailing edge that is also a geodesic.
  • an edge between the grinding pad outer surface and one of the first and second grinding pad outer faces meets the leading edge at an acute angle of more than 45 degrees, and preferably more than 60 degrees.
  • the grinding pad outer surface constitutes a curved non-rectangular parallelogram (that is, comparable to a non-rectangular parallelogram but formed on a curved surface-in this case on a cylinder).
  • the leading edge encounters the workpiece uniformly and obliquely, and plural identical examples of the grinding pad can be exclusively employed, such that any one of the grinding pads mounted on the grinding wheel body can be readily substituted with another when necessary or desired.
  • the leading and trailing edges are geodesies.
  • the grinding pad outer surface constitutes a curved isosceles trapezium (that is, an isosceles trapezium formed on a curved surface).
  • the grinding pad may be of uniform thickness, but in an embodiment, the grinding pad is of non-uniform thickness.
  • the grinding pad may be thicker at its first outer face than at its second outer face, whether progressively or in stepwise fashion (such as by providing the inner surface with a flange or ridge at or adjacent to the first outer face). This may improve the adhesion of the grinding pad or its resistance to inadvertent dislodgement when in use.
  • the grinding pad is sized such that an integral number of like grinding pads can be supported by and fully cover (within manufacturing or mechanical tolerances) an outer circumferential surface of the grinding wheel.
  • the grinding pad is sized such that 18 like grinding pads can be supported by and fully cover the outer circumferential surface of the grinding wheel. It will be appreciated that in other embodiments, the grinding pad may be sized such that fewer grinding pads (e.g. 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 or 17) or more grinding pads (e.g. 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, ..., n-1, n with n being an integer) can be supported by and are required to fully cover an outer circumferential surface of the grinding wheel.
  • fewer grinding pads e.g. 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 or 17
  • more grinding pads e.g. 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, ..., n-1, n with n being an integer
  • leading and trailing edges of the grinding pad are mutually skewed (that is, are neither parallel nor intersecting).
  • the invention provides a grinding wheel carrier body, comprising:
  • a first portion of a grinding pad mounted on the carrier body outersurface e.g. at the vertex where the left side of the carrier body outer surface meets the leading face
  • a second portion of a grinding pad mounted on the carrier body outer surface e.g. at the vertex where the right side of the carrier body outer surface meets the leading face
  • the carrier body is sized such that an integral number of like carrier bodies can be supported by and fully cover (within manufacturing or mechanical tolerances) the outer circumferential surface of the grinding wheel body.
  • the carrier body is sized such that 18 like carrier bodies can be supported by and fully cover the outer circumferential surface of the grinding wheel body. It will be appreciated that in other embodiments, the carrier body may be sized such that fewer carrier bodies (e.g. 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 or 17) or more carrier bodies (e.g. 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, ..., n-1, n with n being an integer) can be supported by and are required to fully cover the outer circumferential surface of the grinding wheel body.
  • carrier bodies e.g. 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 or 17
  • carrier bodies e.g. 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, ..., n-1, n with n being an integer
  • the carrier body is typically of a metal such as steel or aluminium but may, however, also be made of a compound material, such as fiber reinforced plastic, carbon fiber material or the likes.
  • the carrier body outersurface is typically manufactured so that the grinding pad can be glued or otherwise be affixed thereto.
  • the one or more (and preferably a plurality of) mounting points may be threaded apertures for receiving respective bolts that are integral with or securable to the grinding wheel body.
  • the carrier body outer surface has a leading edge that is a geodesic (though other shapes are possible). As a result, the leading edge of a grinding pad mounted on the carrier body would encounter a large flat workpiece at a uniformly oblique angle.
  • the carrier body outer surface has a trailing edge that is also a geodesic.
  • an edge between the carrier body outer surface and one of the first and second carrier body outer faces meets the leading edge at an acute angle of more than 45 degrees, and preferably more than 60 degrees.
  • the carrier body outer surface constitutes a curved non-rectangular parallelogram.
  • the leading edge of a grinding pad mounted on the carrier body encounters the workpiece obliquely, and plural identical examples of the carrier body can be exclusively employed, such that any one of the carrier bodies mounted on the grinding wheel body can be readily substituted with another when necessary or desired.
  • leading and trailing edges of the carrier body are mutually skewed.
  • the carrier body outer surface constitutes a curved isosceles trapezium with leading and trailing edges (the legs of the curved isosceles trapezium) being oblique to the direction of rotation by the same magnitude in opposite directions.
  • leading edge of a grinding pad mounted on the carrier body would encounter the workpiece obliquely but in alternate directions; in some cases, plural identical examples of the carrier body can be employed but arranged with alternating and opposite orientations, such that any one of the carrier bodies can be substituted with another when necessary or desired, or - if the carrier body is not designed to be reversible - two sets of examples of the carrier body (identical in each set but with the carrier bodies of one set being different from those of the other) can be employed, such that any one of the carrier bodies can be substituted when necessary or desired with another from the same set.
  • the carrier body may be of uniform thickness, but in an embodiment, the carrier body is of non-uniform thickness.
  • the carrier body may be thicker at its second outer face than at its first outer face, whether progressively or in stepwise fashion. This may be effected by providing a rebate along the edge of the carrier body outer surface at the first outer face (such as to complement and receive by a flange or ridge provided on the grinding pad inner surface with at or adjacent to the grinding pad first outer face).
  • the carrier body inner surface includes at least one longitudinal alignment flange, or recess, configured to be received by corresponding one or more (preferably substantially complementary) alignment rebates, or recesses, respectively, in an outer circumferential surface of the body, to resist lateral displacement of the carrier body.
  • the outer circumferential surface of the body includes one or more continuous rebates or recesses extending circumferentially in the outer circumferential surface (and hence constituting grooves), whereby the carrier body is locatable at any point along the one or more continuous rebates or recesses.
  • the carrier body inner surface includes a single longitudinal alignment flange for locating in a corresponding rebate or recess of the outer circumferential surface of the body.
  • the single longitudinal alignment flange is located centrally between the outer edges.
  • the carrier body inner surface includes at least one longitudinal alignment rebate or recess configured to receive corresponding one or more (preferably substantially complementary) alignment flanges provided on an outer circumferential surface of the body, to resist lateral displacement of the carrier body.
  • the invention provides a grinding wheel, comprising:
  • the outer circumferential surface of the grinding wheel body has one or more alignment rebates or recesses configured to receive one or more corresponding (and preferably substantially complementary) longitudinal alignment flanges provided on the carrier body inner surfaces, such that the carrier bodies are locatable on the grinding wheel body with the alignment flanges located in the alignment rebates or recesses.
  • the outer circumferential surface of the grinding wheel body has one or more alignment flanges configured to be received by one or more corresponding (and preferably substantially complementary) longitudinal alignment rebates or recesses provided in the carrier body inner surfaces, such that the carrier bodies are locatable on the grinding wheel body with the alignment flanges located in the alignment rebates or recesses.
  • the one or more alignment rebates or recesses are continuous recesses, wherein the carrier body is locatable at any point along the one or more continuous recesses.
  • the outer circumferential surface has a single alignment rebate or recess, or a single alignment flange, such as located centrally between outer edges of the outer circumferential surface.
  • the carrier bodies are provided with respective grinding pads.
  • FIG. 1 is a schematic perspective view of a grinding wheel 10 according to an embodiment of the invention. Grinding wheel 10 is configured to be mounted on the spindle of a grinding machine.
  • Grinding wheel 10 includes a steel grinding wheel body 12 and a plurality of carrier bodies 14 detachably mounted on grinding wheel body 12, such as with bolts (not shown).
  • bolt holes 14 for facilitating the mounting of carrier bodies 14 to grinding wheel body 12 are shown in ghost.
  • carrier bodies 14 are also of steel or aluminium, and are configured to support respective grinding pads 16 (which, in this example, are glued to the respective carrier bodies 14).
  • the carrier bodies 14 are identical and interchangeable, which facilitates their replacement when required or desired.
  • grinding wheel 10 includes 18 carrier bodies 14, which are sized relative to the size of grinding wheel body 12 so that they fully cover (within manufacturing or mechanical tolerances) the outer circumferential surface of grinding wheel body 12.
  • Grinding wheel 10 may optionally include two covers, only one of which-cover 18-is visible in this view; these covers serve to exclude dust and other foreign matter from entering grinding wheel body 12. These covers are mounted to grinding wheel body 12 by any suitable attachment mechanism, such as screws or bolts (not shown). In this view, six countersunk apertures 20 in cover 18 are depicted, for receiving such screws or bolts.
  • Figure 2 is a schematic partially exploded perspective view of grinding wheel 10 of figure 1 .
  • the outer surfaces of carrier bodies 14 are not curved rectangles (i.e. a rectangles projected onto a curved surface), but rather are curved non-rectangular parallelograms.
  • the effect of this shape is that, in use, the junction between any two carrier bodies 14 (or, more strictly, between any two grinding pads 16 mounted on respective carrier bodies 14) generally encounters the workpiece obliquely, which has been found to provide a smoother result in some applications.
  • FIG 3 is a schematic perspective view of grinding wheel body 12 of grinding wheel 10 of figure 1 .
  • Grinding wheel body 12 includes an outer drum 30 and an inner drum 32, defining respectively an outer circumferential surface 34 and an inner circumferential surface 36.
  • Inner drum 32 is configured to be mounted on the spindle of a grinding machine, while inner drum 32 supports outer drum 30 with a plurality of radial ribs 38 extending from inner drum 32 to outer drum 30.
  • Radial ribs 38 define a corresponding plurality of inter-rib compartments 40 (each bounded by a pair of ribs 38, inner drum 32 supports outer drum 30); compartments 40 serve to lighten grinding wheel 12, and to facilitate the cooling of carrier bodies 14 (and hence of grinding pads 16).
  • Outer drum 30 includes a central continuous rebate or groove 42 in outer circumferential surface 34 for receiving respective alignment flanges provided on the carrier bodies inner surfaces.
  • the first and second outer portions 44a and 44b of outer circumferential surface 34, flanking groove 42, are provided with bolt holes 46 for receiving bolts (not shown) for securing carrier bodies 14 to grinding wheel body 12.
  • Corresponding and suitably aligned bolt holes 48 are provided in inner drum 32.
  • grinding wheel body 12 has four bolt holes 46 in outer drum 30 for each carrier body 14, and correspondingly four bolt holes 48 for each carrier body 14 in inner drum 32.
  • first outer portion 44a of outer circumferential surface 34 are offset with respect to the bolt holes 46 in second outer portion 44b.
  • the outer surfaces of carrier bodies 14 are, as discussed above, curved non-rectangular parallelograms.
  • the four exemplary bolt holes 46 identified with reference numerals in this figure are for mounting a particular carrier body 14, even though those in first outer portion 44a appear advanced compared with those in second outer portion 44b (if grinding wheel body is regarded as rotating in the direction of arrows 50).
  • Figure 4A is a schematic perspective view of a carrier body 14 of grinding wheel 10 of figure 1 , with a grinding pad 16, while figure 4B is a schematic perspective view of carrier body 14 without grinding pad 16.
  • carrier body 14 includes an outer surface 60 configured to carry grinding pad 16, an inner surface (not visible in these views), a leading face (not visible in these views), a trailing face 64, a first outer face (not visible in these views but indicated at 66) and a second outer face 68.
  • grinding pad 16 includes an outer surface 70, an inner surface (not visible in these views), a leading face (not visible in these views), a trailing face 74, a first outer face (not visible in these views but indicated at 76) and a second outer face 78.
  • carrier body 14 The inner surface of carrier body 14 is provided with a flange 80 that, when carrier body 14 is mounted on grinding wheel body 12, is received by complementary groove 42-to resist undesired displacement of carrier body 14. Even disregarding flange 80, however, carrier body 14 is not of uniform thickness. It is thicker at second outer face 68 than at first outer face 66, owing to the provision of a rebate 82 at the edge between outer surface 60 and first outer face 66. Similarly, grinding pad 16 is of non-uniform thickness, being thicker at first outer face 76 than at second outer face 78-owing to the provision of a stepped flange or ridge 84 at the edge between outer surface 70 and first outer face 76. Flange or ridge 84 of grinding pad 16 is complementary in form to rebate 82 of carrier body 14.
  • FIG 5A is a schematic elevational view of grinding wheel 10 of figure 1 , illustrating the relative dimensions of its components. It will be noted that, in this example, grinding wheel 10-including carrier bodies 14 and grinding pads 16-has an overall diameter of 500 mm, with inner drum 32 has an inner diameter of 304.8 mm.
  • Figure 5B is a schematic side view of grinding wheel 10: in this example, the total width of grinding wheel 10 is 120 mm, with flange or ridge 84 constituting 5 mm of that width.
  • Figure 5C is a schematic side view comparable to that of figure 5B of a grinding wheel 10' according to a variation of the embodiment of figure 1 .
  • the outer surfaces of grinding pads 16' constitute curved isosceles trapeziums.
  • the carrier bodies of grinding wheel 10' likewise have outer surfaces that constitute curved isosceles trapeziums and-as in grinding wheel 10 of figure 1 -the inner surfaces of grinding pads 16' complement the outer surfaces of the carrier bodies of grinding wheel 10'.
  • Figures 6A and 6B are elevational and side views of grinding wheel body 12 of grinding wheel 10 of figure 1 , indicating the particular dimensions of this example.
  • Figures 7A and 7B are views of carrier body 14 with grinding pad 16, showing-respectively-first outer face 66 and trailing face 64 in elevation.
  • the skewed nature of carrier body 14 is especially apparent from these figures: in figure 7A , first outer face 66 is in the plane of the page, but the leading face 62 of carrier body 14 is visible (as is a leading face 86 of flange 80). Likewise, first outer face 76 of grinding pad 16 is in the plane of the page, but the leading face 72 of grinding pad 16 is visible. In figure 7B , a lower edge 88 of leading face 62 is visible, rather than being entirely obscured by trailing face 64.
  • Figures 8A and 8B are schematic plan views of carrier body 14, with exemplary dimensions shown.
  • the latter view is in partial ghost, so includes mounting points in the form of tapped bores 92 (in this example, four tapped bores), for receiving securing bolts that bolt carrier body 14 to grinding wheel body 12. It will be noted that bores 92 are not parallel, owing to the curved form of carrier body 14.
  • Figures 9A and 9B are schematic cross-sectional views of carrier body 14, through lines A-A and B-B respectively in figure 8B , in each case passing through a pair of tapped bores 92.
  • Figures 10A and 10B are schematic views of carrier body 14, showing-respectively-trailing face 64 and second outer face 68 in elevation and partial ghost.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
EP20168509.6A 2020-04-07 2020-04-07 Tampon de broyage, corps de support de tampon de broyage et meule Active EP3892421B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20168509.6A EP3892421B1 (fr) 2020-04-07 2020-04-07 Tampon de broyage, corps de support de tampon de broyage et meule

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Application Number Priority Date Filing Date Title
EP20168509.6A EP3892421B1 (fr) 2020-04-07 2020-04-07 Tampon de broyage, corps de support de tampon de broyage et meule

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EP3892421A1 true EP3892421A1 (fr) 2021-10-13
EP3892421B1 EP3892421B1 (fr) 2023-01-25

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US945526A (en) * 1909-06-01 1910-01-04 Gilbert Hart Grinding-wheel.
GB264308A (en) * 1925-12-29 1927-01-20 Elwin Rufus Hyde Improvements in or relating to grinding or abrading wheels
EP0124161A2 (fr) * 1983-04-27 1984-11-07 Ermanno Pacini Rouleau tronconique avec surface abrasive pour machine de polissage munie de rouleaux tronconiques
DE8809288U1 (fr) * 1988-07-20 1988-11-24 Naxos-Union Schleifmittel- U. Schleifmaschinenfabrik, 6000 Frankfurt, De
DE19753618A1 (de) 1997-12-03 1999-06-17 Diewe Diamantwerkzeuge Gmbh Trennschleifscheibe
EP1518647A2 (fr) * 2003-09-24 2005-03-30 Inland Diamond Products Company Meule d'ébauche et de polissage ophtalmique
EP1629944A1 (fr) 2004-08-23 2006-03-01 Saint-Gobain Abrasives, Inc. Tambour à meuler
EP2095908A1 (fr) * 2006-11-06 2009-09-02 JTEKT Corporation Meule à affûter avec sillons inclinés et son procédé de fabrication
EP2335877A2 (fr) 2009-12-15 2011-06-22 August Rüggeberg GmbH & Co. KG Meule à éventail pour l'utilisation sur des meuleuses stationnaires

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US945526A (en) * 1909-06-01 1910-01-04 Gilbert Hart Grinding-wheel.
GB264308A (en) * 1925-12-29 1927-01-20 Elwin Rufus Hyde Improvements in or relating to grinding or abrading wheels
EP0124161A2 (fr) * 1983-04-27 1984-11-07 Ermanno Pacini Rouleau tronconique avec surface abrasive pour machine de polissage munie de rouleaux tronconiques
DE8809288U1 (fr) * 1988-07-20 1988-11-24 Naxos-Union Schleifmittel- U. Schleifmaschinenfabrik, 6000 Frankfurt, De
DE19753618A1 (de) 1997-12-03 1999-06-17 Diewe Diamantwerkzeuge Gmbh Trennschleifscheibe
EP1518647A2 (fr) * 2003-09-24 2005-03-30 Inland Diamond Products Company Meule d'ébauche et de polissage ophtalmique
EP1629944A1 (fr) 2004-08-23 2006-03-01 Saint-Gobain Abrasives, Inc. Tambour à meuler
EP2095908A1 (fr) * 2006-11-06 2009-09-02 JTEKT Corporation Meule à affûter avec sillons inclinés et son procédé de fabrication
EP2335877A2 (fr) 2009-12-15 2011-06-22 August Rüggeberg GmbH & Co. KG Meule à éventail pour l'utilisation sur des meuleuses stationnaires

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