EP2873485A1 - Roue de meulage à moyeu déporté - Google Patents

Roue de meulage à moyeu déporté Download PDF

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Publication number
EP2873485A1
EP2873485A1 EP20140193188 EP14193188A EP2873485A1 EP 2873485 A1 EP2873485 A1 EP 2873485A1 EP 20140193188 EP20140193188 EP 20140193188 EP 14193188 A EP14193188 A EP 14193188A EP 2873485 A1 EP2873485 A1 EP 2873485A1
Authority
EP
European Patent Office
Prior art keywords
grinding wheel
external diameter
depressed
concave portion
grinding
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
EP20140193188
Other languages
German (de)
English (en)
Other versions
EP2873485B1 (fr
Inventor
Giovanni Ficai
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.)
FICAI, GIOVANNI
Original Assignee
Ficai Giovanni
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Filing date
Publication date
Application filed by Ficai Giovanni filed Critical Ficai Giovanni
Publication of EP2873485A1 publication Critical patent/EP2873485A1/fr
Application granted granted Critical
Publication of EP2873485B1 publication Critical patent/EP2873485B1/fr
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Anticipated expiration legal-status Critical

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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
    • B24D5/12—Cut-off wheels
    • 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
    • B24D5/02—Wheels in one piece
    • B24D5/04—Wheels in one piece with reinforcing means
    • 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
    • B24D5/16—Bushings; Mountings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D7/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor
    • B24D7/02—Wheels in one piece
    • B24D7/04—Wheels in one piece with reinforcing means
    • 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
    • B24D7/16—Bushings; Mountings

Definitions

  • the present invention relates to a grinding wheel, in particular a depressed-centre grinding wheel made of at least a compacted abrasive material.
  • grinding wheels exist of a disc-shaped type having a depressed centre, or centres that are flat, conical, semi-flexible, dimpled or not dimpled, exhibiting an external diameter that is substantially comprised between 20 and 230 mm, especially used on electric portable grinding machines, or highspeed compressed air grinding machines (60-100 m/s peripheral velocity), also known as sanders, able to perform burring and/or cutting operations, which are essentially constituted by an abrasive mixture reinforced with armatures constituted by one or more textile meshes, one or more annular metal elements, commonly known as washers or sleeves, which delimit the fixing hole of the grinding wheel to the shaft of the grinding machine, and possibly bear a paper label, or commonly used adherent rating plate stuck on one of the two faces of the grinding wheel (in depressed-centre grinding wheels usually the convex face).
  • the abrasive mixture is generally constituted by grains of abrasive material (silicon carbide, light green, dark green, black, corundum, modified corundums with zirconium, semi-friable, dark brown, white, pink, ruby, with ceramic, mono-crystalline, sol-gel abrasives or sintered ceramics, or other like materials) having a predefined granulometry (normally measured in meshes) which are mixed with resins, for example phenolic, liquid and/or powder and possibly modified with epoxy resins, and/or others, possibly modified with organic compounds and/or vegetal or synthetic compounds, and other types of polyamide resins, etc., with the use of additives and fillers.
  • abrasive material silicon carbide, light green, dark green, black, corundum, modified corundums with zirconium, semi-friable, dark brown, white, pink, ruby, with ceramic, mono-crystalline, sol-gel abrasives or sintered ceramics, or other like
  • the labels are made of paper or foil or another synthetic material and normally are circular-annulus shaped (though they could be of any other shape), and can occupy either the whole face of the grinding wheel or a limited area of the face on which the identifying and information data of the grinding wheel are reported.
  • Flat grinding wheels exhibit the whole circular annulus projecting externally of the annular elements which delimit the attaching hole potentially active in the cutting operations, and which can therefore exhibit a depth that is substantially equal to the radial thickness of the circular annulus (except the part of the blocking flanges which block the grinding wheel on the rotary shaft of the grinding machine, which normally have an external diameter of 42 mm), and/or the grinding wheel can be used for a large number of cutting operations.
  • Flat grinding wheels exhibit a high flexibility and therefore low precision in the cutting operations and a low resistance to inappropriate uses and stresses. Further, as they are not very rigid, they can be subject to flutter during rotation, which makes precision cuts difficult to carry out.
  • Depressed-centre grinding wheels have the advantage, with respect to flat grinding wheels, of having a three-dimensional shape and therefore of providing a greater rigidity, stability and precision.
  • the main disadvantage of the depressed-centre grinding wheels is that the cupola, or cap, which generally extends over a conspicuous radial tract of the grinding wheel (in practice, it normally exhibits an external diameter of about 65 mm, so that the attaching flange, which has a standard external diameter of 42 mm, of the grinding machine can be accommodated in the concave part of the cupola) and therefore does not enable the cut to be as deep as with a flat grinding wheel and/or does not enable making a same number of total cuts as with a flat grinding wheel.
  • An aim of the present invention is to obviate the above-mentioned drawbacks in the prior art, with a solution that is simple, rational and relatively inexpensive.
  • the invention relates in particular to a depressed-centre grinding wheel comprising at least a circular cutting annulus made of a substantially planar compacted abrasive material lying on a plane that is perpendicular to the rotation axis of the grinding wheel and a concave central portion provided with a central through-hole for attachment.
  • the internal diameter of the circular annulus coinciding with the external diameter of the concave portion is not greater than 55 mm.
  • the wheel exhibits a larger active cutting portion and therefore a greater depth of cut and/or it can be used to perform a greater number of cuts.
  • the external diameter of the circular annulus is substantially comprised between 100 and 230 mm, preferably between 100 and 125 mm.
  • the concave portion advantageously comprises a first central section that is substantially planar and a concave cap, in which the inclination of the cap wall is substantially comprised between 40° e 70°.
  • a further aspect of the invention relates to a method for realizing a depressed-centre grinding wheel, according to any one of the preceding claims, which comprises steps of:
  • a further aspect of the invention relates to a grinding system which comprises a grinding machine having a rotary shaft which can be inserted into the grinding wheel, as described above, (i.e. into the through-hole) and a coupling flange suitable to be inserted into the concave portion of the grinding wheel and having an external diameter substantially equal to 42 mm.
  • reference numeral 10 denotes in its entirety a depressed-centre cutting wheel.
  • the grinding wheel 10 comprises an abrasive disc-shaped element 11 which is attachable, substantially coaxially, to the free end of a rotating shaft of a grinding machine.
  • the disc-shaped element 11 comprises at least a substantially central through-hole 12 and a first convex face 13 defining the back of the disc-shaped element.
  • the disc-shaped element 11 further comprises a second face 14 opposite the first face 13.
  • the disc-shaped element 11 is realized by at least a layer of an abrasive mixture that is compacted and stably bound by a binder resin.
  • the disc-shaped element 11 is obtained by pressing a mixture of a loose powder of abrasive material, for example abrasive material such as natural corundum, sand, recycled artificial corundum or the like, abrasive sol-gel or sintered ceramic, corundum at zirconium, or other, and mixed with a suitable binder, for example resin-based, such as phenolic, liquid and/or powder resins possibly modified with phenoxy epoxy resins and/or others, modified with organic and/or vegetal or synthetic compounds, and other types of poly-imide resins, etc...., and/or with additives and fillers.
  • abrasive material for example abrasive material such as natural corundum, sand, recycled artificial corundum or the like, abrasive sol-gel or sintered ceramic, corundum at zirconium, or other
  • a suitable binder for example resin-based, such as phenolic, liquid and/or powder resins possibly modified with phenoxy epoxy resins and/
  • the disc-shaped element 11 is constituted by an external peripheral circular annulus 15 and a disc-shaped internal cap 16 (or hub), both coaxial to the through-hole 12.
  • the disc-shaped cap 16 which comprises the through-hole 12, extends radially externally from the circular annulus 15.
  • the circular annulus 15 lies substantially in a perpendicular plane to the axis of the grinding wheel 10 (axis of the through-hole 12).
  • the circular annulus 15 of the abrasive mixture is the active portion of the grinding wheel 10, i.e. the portion thereof that is generally used for cutting.
  • the circular annulus 15 has an external diameter De, variable during use, which defines the external diameter of the grinding wheel 10 and an internal diameter Di, fixed, which defines the external diameter of the circular cap 16.
  • the circular cap 16 has an external diameter substantially equal to the internal diameter Di of the circular annulus 15 and an internal diameter substantially equal to the diameter of the through-hole 12.
  • the external diameter of the circular cap 16 which substantially coincides with the internal diameter Di of the circular annulus 15, is substantially not greater than 60 mm (for example, less than 57.5 mm).
  • the external diameter of the circular cap 16 is substantially 55 mm.
  • the external diameter (De) of the circular annulus 15 is between 100 and 230 mm.
  • the wheels 10 have standardized dimensions and are classified according to the external diameter (De) of the grinding wheel 10, which exhibit the following rated dimensions:
  • the external diameter (De) of the circular annulus 15 is preferably between 100 and 155 mm and preferably between 115 and 150 mm.
  • the peculiarity of the invention i.e. the fact that the external diameter of the circular cap 16 does not exceed 60 mm is decidedly more advantageous, as it provides a percentage active portion greater than the grinders (of the same diameter) of the traditional type (as shown in figure 1 ), given an identical sturdiness of the grinding wheel 10.
  • the ratio between the internal diameter Di and the external diameter De of the circular annulus 15 is substantially less than 1 ⁇ 2.
  • the cap wall 162 of the concave circular cap 16 has an inclination substantially comprised between 40 and 70°, preferably 60°.
  • the cap wall 162 radially occupies a radial portion substantially identical to the distance of the rise that it defines (i.e. the axial distance between the first internal portion 161 and the circular annulus 15, which are substantially parallel).
  • the abrasive mixture has a granulometry of substantially between 120 and 12 mesh (however abrasive mixtures of a greater or smaller particle size than the above-described range recorded can be used, according to requirements).
  • the layer of abrasive mixture can have a thickness of around 3 mm or less, though this could be greater or smaller than 3 mm, depending on requirements.
  • the grinding wheel 10 comprises, for example, at least a reinforcement mesh 17, schematically illustrated in figure 2 , incorporated in the layer of abrasive mixture.
  • the reinforcing mesh 17 is for example disc-shaped and substantially coplanar to at least the first face 14 of the disc-shaped element 11.
  • the grinding wheel 10 can have a plurality of reinforcing meshes 17 and a plurality of layers of abrasive material of different nature, according to needs.
  • a label 18 can be placed on the first face 14, i.e. the back of the wheel 10, illustrated schematically in figure 2 ; the label can be paper or foil or other like material.
  • the abrasive mixtures of the layer of abrasive mixture, as well as the reinforcing mesh 17 and the label 18, are of a type widely known in the industry.
  • the label 18 can otherwise be applied once the grinding wheel 10 has been fired/polymerised, by gluing or applying self-adhesive labels, by screening, pad printing, spraying or another form of stencil painting.
  • the grinding wheel 10 includes one or more metal annular elements, commonly known as washers or sleeves 19, which delimit the attachment hole of the grinding wheel 10 to the pivot of the grinding machine.
  • the washer 19 comprises a hollow central shank 190 that inserts substantially snugly in the through-hole 12 and which exhibits an axial thickness that is substantially identical to (or slightly smaller than) the axial thickness of the grinding wheel 10 (the layer of abrasive mixture that constitutes the disc-shaped element 11).
  • the method for realising a grinding wheel 10 as described above comprises a step of raw-moulding a semi-finished grinding wheel that is substantially planar, i.e. so that the not-yet-concave central area that will form the disc-shaped cap 16 is substantially coplanar to the disc-shaped circular annulus 15.
  • the substantially planar raw moulding grinding wheel 10 is realized using a mould able to press the abrasive mixture together with the binder resin and give it the desired disc-shape.
  • the forming method continues by deforming the central portion of the grinding wheel, so as to define the disc-shaped cap 16 having an external diameter substantially equal to the internal diameter Di of the circular annulus 15, wherein the external diameter of the disc-shaped cap is substantially less than 60 mm.
  • the step of deforming the semi-finished grinding wheel is advantageously done by inserting the grinding wheel into a mould, the bottom die of which (and/or the punch) is shaped such as to impart the desired shape to the grinding wheel.
  • the grinding wheel 10 is subjected to a thermal cycle which involves the insertion thereof in an oven at a temperature of substantially between 120° and 220° C for a time substantially comprised between 1 and 50 hours, or it can be fired in situ in the heated mould suitable for forming of the 10 depressed-centre grinding wheel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
EP14193188.1A 2013-11-15 2014-11-14 Roue de meulage à moyeu déporté Active EP2873485B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITRE20130086 ITRE20130086A1 (it) 2013-11-15 2013-11-15 Mola da taglio a centro depresso

Publications (2)

Publication Number Publication Date
EP2873485A1 true EP2873485A1 (fr) 2015-05-20
EP2873485B1 EP2873485B1 (fr) 2019-06-05

Family

ID=49887108

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14193188.1A Active EP2873485B1 (fr) 2013-11-15 2014-11-14 Roue de meulage à moyeu déporté

Country Status (3)

Country Link
EP (1) EP2873485B1 (fr)
CA (1) CA2871182C (fr)
IT (1) ITRE20130086A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113302022A (zh) * 2019-01-14 2021-08-24 奥古斯特吕格贝格有限及两合公司 研磨盘及其用途

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3836345A (en) * 1968-12-16 1974-09-17 Cincinnati Ind Inc Laminated grinding wheel
JP2003175467A (ja) * 2001-12-10 2003-06-24 Asahi Diamond Industrial Co Ltd オフセット型カッター及び該カッター用カバー
WO2012092610A1 (fr) * 2010-12-30 2012-07-05 Saint-Gobain Abrasives, Inc. Meules et leurs procédés de fabrication et d'utilisation

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7306787U (de) * 1973-05-24 Dronco Nothhaft O & Co Schleifscheibe
DE3545308A1 (de) * 1985-12-20 1987-06-25 Feldmuehle Ag Schleifscheibe mit daempfung
EP2588274B8 (fr) * 2010-06-29 2022-04-27 PPR GmbH Procédé de moulage par injection pour la production d'un porte-outil doté d'un renforcement en fibres de jute
WO2012127507A1 (fr) * 2011-03-18 2012-09-27 Giovanni Ficai Procédé de fabrication de meules abrasives et machine associée

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3836345A (en) * 1968-12-16 1974-09-17 Cincinnati Ind Inc Laminated grinding wheel
JP2003175467A (ja) * 2001-12-10 2003-06-24 Asahi Diamond Industrial Co Ltd オフセット型カッター及び該カッター用カバー
WO2012092610A1 (fr) * 2010-12-30 2012-07-05 Saint-Gobain Abrasives, Inc. Meules et leurs procédés de fabrication et d'utilisation

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ANONYMOUS: "Norton Abrasives improves and expands depressed center wheels offering for metal fabricating", 9 November 2010 (2010-11-09), XP055164314, Retrieved from the Internet <URL:http://www.nortonindustrial.com/news-improvedexpandeddepressedcenterwheelline.aspx> [retrieved on 20150122] *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113302022A (zh) * 2019-01-14 2021-08-24 奥古斯特吕格贝格有限及两合公司 研磨盘及其用途
CN113302022B (zh) * 2019-01-14 2023-11-17 奥古斯特吕格贝格有限及两合公司 研磨盘及其用途

Also Published As

Publication number Publication date
ITRE20130086A1 (it) 2015-05-16
CA2871182C (fr) 2021-06-08
CA2871182A1 (fr) 2015-05-15
EP2873485B1 (fr) 2019-06-05

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