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EP1993786B1 - Fine fettling wheel, use of said wheel, and method for producing the same - Google Patents

Fine fettling wheel, use of said wheel, and method for producing the same Download PDF

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Publication number
EP1993786B1
EP1993786B1 EP07731681A EP07731681A EP1993786B1 EP 1993786 B1 EP1993786 B1 EP 1993786B1 EP 07731681 A EP07731681 A EP 07731681A EP 07731681 A EP07731681 A EP 07731681A EP 1993786 B1 EP1993786 B1 EP 1993786B1
Authority
EP
European Patent Office
Prior art keywords
wheel
layers
abrasive grains
layer
grinding wheel
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.)
Revoked
Application number
EP07731681A
Other languages
German (de)
French (fr)
Other versions
EP1993786A2 (en
Inventor
Flavien Lavaire
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.)
Saint Gobain Abrasifs Technologie et Services SAS
Original Assignee
Saint Gobain Abrasifs Technologie et Services SAS
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=36579694&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1993786(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Saint Gobain Abrasifs Technologie et Services SAS filed Critical Saint Gobain Abrasifs Technologie et Services SAS
Priority to SI200730880T priority Critical patent/SI1993786T1/en
Priority to PL07731681T priority patent/PL1993786T3/en
Publication of EP1993786A2 publication Critical patent/EP1993786A2/en
Application granted granted Critical
Publication of EP1993786B1 publication Critical patent/EP1993786B1/en
Revoked legal-status Critical Current
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
    • B24D13/00—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D13/00—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor
    • B24D13/02—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by their periphery
    • B24D13/08—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by their periphery comprising annular or circular sheets packed side by side
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D18/00—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for
    • B24D18/0009—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for using moulds or presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D18/00—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for
    • B24D18/0045—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for by stacking sheets of abrasive material

Definitions

  • the present invention relates to a grinding wheel, and possibly cutting, in disk form, according to the preamble of claim 1.
  • This standard defines in particular essential criteria for the production of deburring wheels, corresponding to the types referenced 27, 28 and 29 in this standard.
  • a grinding wheel must imperatively have a thickness of between 4 and 10 mm, as illustrated in the document EP 1543923 on which the preamble of claim 1 is based.
  • the present invention thus relates in its broadest sense to a grinding wheel, according to claim 1 characterized in that the working area has a total thickness of less than 4 mm and preferably less than or equal to 3.2 mm.
  • This thickness is measurable over the entire width and the entire length of the work area.
  • the wheel according to the invention has at least two adjacent working areas and preferably three working areas adjacent two by two.
  • These working areas are preferably substantially perpendicular two by two.
  • the grinding wheel according to the invention may in particular have a thickness greater than 2.5 mm or 3.2 mm.
  • At least one outer layer containing no abrasive grains, or even the two outer layers containing no abrasive grains has (a) diameter smaller than the total diameter of the grinding wheel.
  • the term "slab” designates a constituent layer formed from abrasive grains which has a consistency such that the slab can be handled, and in particular seized and moved by hand or by using a machine.
  • This slab may therefore consist of a single layer formed from abrasive grains or may comprise on one side a layer containing no grains, abrasives.
  • working sector designates a surface of the grinding wheel in contact with which it is possible to deburr.
  • the passage time at each subsequent station can be significantly reduced since it no longer depends on the duration of operations. discharge of the powdered product or pressing under high pressure. In addition, the pressure used can be reduced.
  • the present invention also relates to the use of a grinding wheel according to the invention, to perform a deburring operation.
  • the grinding wheel according to the invention can be used for deburring, as well as possibly for cutting.
  • the figure 1 illustrates a grinding wheel (1) according to the invention.
  • This grinding wheel (1) has a general disk shape and thus has a central axis X, a central fixing zone F and at least one peripheral working zone Z extending externally to the central fixing zone with respect to the axis central.
  • the attachment zone consists of a metal washer and allows the fixing of the wheel on a hub of a grinding machine.
  • This washer may not be flat to allow to achieve a wheel with a offset.
  • the grinding wheel has two layers (3, 5) formed from abrasive grains.
  • the layers not containing abrasive grains (2, 4, 6) are, for example, glass fiber grids coated with phenolic resin.
  • Different grammages may be used for the fiberglass grid, for example from 75 to 420 grams per square meter.
  • a sheet of paper can also be glued to one or both of the outer surfaces of the grinding wheel.
  • an outer layer or even the two outer layers not containing abrasive grains (2, 6) to have a diameter smaller than the total diameter of the grinding wheel, and to have a diameter reduced from about 2 to 50 mm.
  • the layers (3, 5) are formed from abrasive grains which consist, for example, mainly of Alumina (Al 2 O 3 ), or for example a Zirconia-Alumina (ZrO 2 -Al 2 O 3 ) mixture, or even grains mainly consisting of silicon carbide (SiC).
  • abrasive grains used may also be subjected to different thermal, mechanical, physical or chemical treatments to improve the abrasive performance (hardness, friability, roughness, etc ).
  • the layers (3, 5) formed from these abrasive grains may consist of abrasive grains of different sizes, the average size of which is generally defined by those skilled in the art by the term "grit", or a mixture of grains of different sizes.
  • the average size of the abrasive grains is, according to a possible embodiment of the invention, between 1035 microns (grit 24) and 122 microns (grit 150).
  • the layers (3, 5) may be formed from the abrasive grains bonded together by a binder composed of various phenolic powder resins (eg Novolak) and / or in liquid (eg Resole) as well as possibly with additives or fillers.
  • a binder composed of various phenolic powder resins (eg Novolak) and / or in liquid (eg Resole) as well as possibly with additives or fillers.
  • the fillers or additives used may be mainly composed of iron sulphides, aluminum and potassium double fluoride, potassium sulphate or calcium carbonate (lime).
  • the working zone Z has a total thickness e of less than 4 mm, and preferably less than or equal to 3.2 mm and greater than 2 mm.
  • the grinding wheel (1) has three working areas (S1, S2, S3) adjacent in pairs: the sectors S1 and S3 correspond to the main working surfaces and the sector S2 corresponds to the outer edge of the grinding wheel.
  • a grinding wheel was made presenting the structure illustrated on the figure 1 .
  • the mixture of grains used in each layer (3,5) consists of two types of grains, one having an average size of 508 ⁇ m (grit 46) representing 85% by volume of the total volume of the mixture of abrasive grains and 1 another having an average size of 406 ⁇ m (grit 60) representing 15% by volume of the total volume of the mixture of abrasive grains.
  • the binder used in each layer (3.5) consists of 65% by volume of phenolic resin (liquid + 15% by weight hexamethylenetetramine powder) and fillers: 15% by volume of iron sulphide, 18% by volume of sulphates of potassium and 2% by volume of lime.
  • Each layer (3.5) thus consists of approximately 44% by volume of abrasive grains, 46% by volume of binder, the rest being porosity.
  • the fabric used for the layers (2, 4, 6) has a basis weight of 195, 170 and 195 grams per square meter, respectively.
  • This grinding wheel has after manufacture a thickness e of about 2.5 mm and an overall diameter of 125 mm.
  • This grinding wheel although not having the thickness required by ISO 525 for a grinding wheel, has satisfied all the safety tests of the EN 12413 standard for grinding wheels type 27, 28 and 29.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Pens And Brushes (AREA)
  • Sliding-Contact Bearings (AREA)
  • Food-Manufacturing Devices (AREA)

Abstract

The invention relates to a fettling, optionally sawing, wheel (1), in the form of a disk, said wheel comprising a central axis X, a central attaching region F, and at least one peripheral working region Z which extends outside the central fixing region in relation to the central axis, said wheel comprising at least one layer (3, 5) formed from abrasive grains and two layers which do not contain any abrasive grains (2, 6) surrounding the wheel. The inventive wheel is characterised in that the working region Z has a total thickness of less than 4 mm and preferably less than or equal to 3.2 mm.

Description

La présente invention se rapporte à une meule d'ébarbage, et éventuellement de tronçonnage, sous forme de disque, selon le préambule de la revendication 1.The present invention relates to a grinding wheel, and possibly cutting, in disk form, according to the preamble of claim 1.

Par ébarbage au sens de la présente invention, il faut comprendre tout opération de dégrossissage, d'usure, d'aiguisage, de polissage, ... par opposition à une opération de tronçonnage consistant à opération de découpage.By deburring within the meaning of the present invention, it is necessary to understand any operation of roughing, wear, sharpening, polishing, ... as opposed to a cutting operation consisting of cutting operation.

Il est connu dans l'art antérieur en particulier de la demande internationale de brevet N° WO 00/74898 de réaliser des meules minces non pas d'ébarbage mais de tronçonnage.It is known in the prior art in particular from the international patent application No. WO 00/74898 to make thin wheels not burring but cutting.

L'homme du métier connaît par ailleurs la norme ISO 525 relative aux produits abrasifs en général.Those skilled in the art also know the ISO 525 standard for abrasive products in general.

Comme toute norme, elle est le reflet exhaustif de ce que l'homme du métier considère comme nécessaire et suffisant pour parvenir à des produits satisfaisants.Like any standard, it is a comprehensive reflection of what the skilled person considers necessary and sufficient to achieve satisfactory products.

Cette norme définit en particulier des critères indispensables pour la réalisation de meules d'ébarbage, correspondant aux types référencés 27, 28 et 29 dans cette norme.This standard defines in particular essential criteria for the production of deburring wheels, corresponding to the types referenced 27, 28 and 29 in this standard.

Selon cette norme, une meule d'ébarbage doit impérativement présenter une épaisseur comprise entre 4 et 10 mm, comme illustré dans le document EP 1543923 sur lequel se base le préambule de revendication 1.According to this standard, a grinding wheel must imperatively have a thickness of between 4 and 10 mm, as illustrated in the document EP 1543923 on which the preamble of claim 1 is based.

Il s'avère que d'une manière complètement surprenante, il est possible de réaliser des meules d'ébarbage ne répondant pas au critère d'épaisseur de la norme mais répondant à tous les autres critères, notamment relatifs à la sécurité lors de l'utilisation des meules, et donnant pleinement satisfaction pour l'application d'ébarbage visée.It turns out that in a completely surprising way, it is possible to make deburring wheels not meeting the thickness criterion of the standard but meeting all the other criteria, in particular relating to the safety during operation. use of the grinding wheels, and giving full satisfaction for the intended grinding application.

La présente invention se rapporte ainsi dans son acception la plus large à une meule d'ébarbage, selon la revendication 1 caractérisée notamment en ce que la zone de travail présente une épaisseur totale inférieure à 4 mm et de préférence inférieure ou égale à 3,2 mm.The present invention thus relates in its broadest sense to a grinding wheel, according to claim 1 characterized in that the working area has a total thickness of less than 4 mm and preferably less than or equal to 3.2 mm.

Cette épaisseur est mesurable sur toute la largeur et toute la longueur de la zone de travail.This thickness is measurable over the entire width and the entire length of the work area.

La meule selon l'invention présente au moins deux secteurs de travail adjacents et de préférence trois secteurs de travail adjacents deux à deux.The wheel according to the invention has at least two adjacent working areas and preferably three working areas adjacent two by two.

Ces secteurs de travail sont, de préférence, sensiblement perpendiculaires deux à deux.These working areas are preferably substantially perpendicular two by two.

La meule selon l'invention peut présenter en particulier une épaisseur supérieure à 2,5 mm ou 3,2 mm.The grinding wheel according to the invention may in particular have a thickness greater than 2.5 mm or 3.2 mm.

Par ailleurs, dans une variante particulière, au moins une couche extérieure ne contenant pas de grains abrasifs, voire les deux couches extérieures ne contenant pas de grains abrasifs présente(nt) un diamètre plus petit que le diamètre total de la meule.Moreover, in a particular variant, at least one outer layer containing no abrasive grains, or even the two outer layers containing no abrasive grains has (a) diameter smaller than the total diameter of the grinding wheel.

Au sens de la présente invention, le terme « couche » désigne une couche comportant au moins un matériau destiné à constituer la meule. Ces couches sont de deux types :

  • des couches ne contenant pas de grains abrasifs, notamment du type feuille de protection dite « papier », ou du type feuille de renfort dite « tissu », ou
  • des couches formées à partir de grains abrasifs, du type comportant des grains abrasifs liés entre eux par un liant.
For the purposes of the present invention, the term "layer" designates a layer comprising at least one material intended to constitute the grinding wheel. These layers are of two types:
  • layers that do not contain abrasive grains, in particular of the "paper" type protective sheet, or of the "fabric" type reinforcing sheet, or
  • layers formed from abrasive grains, of the type comprising abrasive grains bonded together by a binder.

Par ailleurs, au sens de la présente invention, le terme « galette » désigne une couche de constituant formée à partir de grains abrasifs qui présente une consistance telle que la galette peut être manipulée, et notamment saisie et déplacée à la main ou à l'aide d'une machine.Furthermore, for the purposes of the present invention, the term "slab" designates a constituent layer formed from abrasive grains which has a consistency such that the slab can be handled, and in particular seized and moved by hand or by using a machine.

Cette galette peut donc être constituée d'une seule couche formée à partir de grains abrasifs ou peut comporter sur une face une couche ne contenant pas de grains, abrasifs.This slab may therefore consist of a single layer formed from abrasive grains or may comprise on one side a layer containing no grains, abrasives.

Par ailleurs, au sens de la présente invention, le terme « secteur de travail » désigne une surface de la meule au contact de laquelle il est possible d'ébarber.Furthermore, within the meaning of the present invention, the term "working sector" designates a surface of the grinding wheel in contact with which it is possible to deburr.

Il s'avère par ailleurs que d'une manière complètement surprenante il est possible d'utiliser le procédé de fabrication de meules minces de tronçonnage connu de la demande internationale de brevet N° WO 00/74898 pour la réalisation de meules d'ébarbage selon l'invention.It is also found that in a completely surprising manner it is possible to use the method of manufacturing thin cutting wheels known from the international patent application No. WO 00/74898 for the production of deburring wheels according to the invention.

La présente invention se rapporte ainsi également à un procédé de fabrication d'une meule d'ébarbage, et éventuellement de tronçonnage, selon la revendication 4, procédé selon lequel :

  • une couche à base de grains abrasifs est formée directement dans un moule en l'absence de couche de renfort sous-jacente,
  • éventuellement une couche de renfort est déposée sur cette couche de grains abrasifs,
  • la ou les couches sont pressées pour former une galette
  • la galette est retirée du moule
  • la galette est assemblée avec
    • soit une ou deux autre(s) couche(s) de renfort, de manière à ce que deux couches de renfort encadrent la meule,
    • soit au moins une autre galette et au moins une ou deux autre(s) couche(s) de renfort de manière à ce que deux couches de renfort encadrent la meule,
  • l'ensemble est pressé afin de former une meule.
The present invention thus also relates to a method of manufacturing a grinding wheel, and possibly cutting, according to claim 4, the method according to which:
  • a layer based on abrasive grains is formed directly in a mold in the absence of an underlying reinforcing layer,
  • optionally a reinforcing layer is deposited on this layer of abrasive grains,
  • the layer or layers are pressed to form a cake
  • the cake is removed from the mold
  • the cake is assembled with
    • one or two other reinforcing layers, so that two reinforcing layers frame the grinding wheel,
    • at least one other slab and at least one or two other reinforcing layer (s) so that two reinforcing layers frame the grinding wheel,
  • the whole is pressed to form a grinding wheel.

Grâce au fait que l'on fabrique tout d'abord une galette, et que l'on superpose ensuite les différentes couches, le temps de passage à chaque poste ultérieur peut être notablement réduit puisqu'il ne dépend plus de la durée d'opérations de déversement du produit pulvérulent ou de pressage sous haute pression. En outre, la pression utilisée peut être réduite.Thanks to the fact that a slab is first made, and then the different layers are superimposed, the passage time at each subsequent station can be significantly reduced since it no longer depends on the duration of operations. discharge of the powdered product or pressing under high pressure. In addition, the pressure used can be reduced.

La présente invention se rapporte également à l'utilisation d'une meule selon l'invention, pour réaliser une opération d'ébarbage.The present invention also relates to the use of a grinding wheel according to the invention, to perform a deburring operation.

Dans le cadre de la présente invention on utilise une installation de fabrication de meules d'ébarbage, et éventuellement de tronçonnage, sous forme de disque, lesdites meules présentant chacune un axe central, une zone de fixation centrale et au moins une zone de travail périphérique s'étendant à la périphérie extérieure de la zone de fixation centrale par rapport à l'axe central, lesdites meules comportant chacune au moins une couche à base de grains abrasifs et deux couches ne contenant pas de grains abrasifs encadrant la meule, ladite installation comportant

  • un poste de remplissage d'un moule par la ou les couches de constituant à partir desquels on forme une galette,
  • une machine de pressage de la ou des couche(s) de constituant contenue(s) dans le moule pour former ladite galette,
  • un poste d'assemblage destiné à former une pile de couches superposées à partir d'au moins une galette et d'au moins une autre couche de constituant,
    • une machine de pressage pour comprimer la pile et former une meule d'ébarbage, et éventuellement de tronçonnage, dont une zone de travail présente une épaisseur totale inférieure à 4 mm et de préférence inférieure ou égale à 3,2 mm.
In the context of the present invention is used a facility for manufacturing deburring wheels, and possibly cutting, in disk form, said grinding wheels each having a central axis, a central fixing area and at least one peripheral working area extending to the outer periphery of the central fixation zone with respect to the central axis, said grinding wheels each comprising at least one layer based on abrasive grains and two layers containing no abrasive grains surrounding the grinding wheel, said installation comprising
  • a filling station of a mold by the constituent layer or layers from which a slab is formed,
  • a machine for pressing the constituent layer (s) contained in the mold to form said wafer,
  • an assembly station for forming a stack of superposed layers from at least one slab and at least one other constituent layer,
    • a pressing machine for compressing the pile and forming a grinding wheel, and possibly cutting, of which a working area has a total thickness of less than 4 mm and preferably less than or equal to 3.2 mm.

Avantageusement, la meule selon l'invention peut être utilisée pour l'ébarbage, ainsi que, éventuellement pour le tronçonnage.Advantageously, the grinding wheel according to the invention can be used for deburring, as well as possibly for cutting.

La présente invention sera mieux comprise à la lecture de la description détaillée ci-après d'exemples de réalisation non limitatifs et de la figure ci-jointe illustrant une coupe axiale d'une meule d'ébarbage selon l'invention.The present invention will be better understood on reading the detailed description below of nonlimiting exemplary embodiments and the attached figure illustrating an axial section of a grinding wheel according to the invention.

Il est précisé que les proportions entre les divers éléments représentés ne sont pas rigoureusement respectées dans cette figure afin d'en faciliter la lecture.It is specified that the proportions between the various elements represented are not rigorously respected in this figure in order to facilitate reading.

La figure 1 illustre une meule (1) d'ébarbage selon l'invention.The figure 1 illustrates a grinding wheel (1) according to the invention.

Cette meule (1) présente une forme générale de disque et présente ainsi un axe central X, une zone de fixation centrale F et au moins une zone de travail périphérique Z s'étendant extérieurement à la zone de fixation centrale par rapport à l'axe central.This grinding wheel (1) has a general disk shape and thus has a central axis X, a central fixing zone F and at least one peripheral working zone Z extending externally to the central fixing zone with respect to the axis central.

La zone de fixation est constituée d'une rondelle métallique et permet la fixation de la meule sur un moyeu d'un engin de meulage.The attachment zone consists of a metal washer and allows the fixing of the wheel on a hub of a grinding machine.

Cette rondelle peut ne pas être plate afin de permettre de réaliser une meule présentant un déport.This washer may not be flat to allow to achieve a wheel with a offset.

La meule comporte deux couches (3, 5) formées à partir de grains abrasifs.The grinding wheel has two layers (3, 5) formed from abrasive grains.

Les couches ne contenant pas de grains abrasifs (2, 4, 6) sont par exemple des grilles en fibres de verre enduites de résine phénolique.The layers not containing abrasive grains (2, 4, 6) are, for example, glass fiber grids coated with phenolic resin.

Différents grammages peuvent être utilisés pour la grille en fibres de verre, comme par exemple de 75 à 420 grammes par mètre carré.Different grammages may be used for the fiberglass grid, for example from 75 to 420 grams per square meter.

Une feuille de papier peut en outre collée sur une (ou les) face(s) extérieure(s) de la meule.A sheet of paper can also be glued to one or both of the outer surfaces of the grinding wheel.

Il est possible par ailleurs qu'une couche extérieure, voire les deux couches extérieures ne contenant pas de grains abrasifs (2, 6) présente(nt) un diamètre plus petit que le diamètre total de la meule, et présente(nt) un diamètre réduit de l'ordre de 2 à 50 mm.It is also possible for an outer layer or even the two outer layers not containing abrasive grains (2, 6) to have a diameter smaller than the total diameter of the grinding wheel, and to have a diameter reduced from about 2 to 50 mm.

Les couches (3, 5) sont formées à partir de grains abrasifs qui sont par exemple majoritairement constitués d'Alumine (Al2O3), ou par exemple un mélange Zircone - Alumine (ZrO2-Al2O3) ou encore des grains majoritairement constitués de Carbure de Silicium (SiC). Les grains abrasifs utilisés peuvent en outre être soumis à différents traitements thermiques, mécaniques, physiques ou chimiques pour en améliorer les performances abrasives (dureté, friabilité, rugosité, etc...).The layers (3, 5) are formed from abrasive grains which consist, for example, mainly of Alumina (Al 2 O 3 ), or for example a Zirconia-Alumina (ZrO 2 -Al 2 O 3 ) mixture, or even grains mainly consisting of silicon carbide (SiC). The abrasive grains used may also be subjected to different thermal, mechanical, physical or chemical treatments to improve the abrasive performance (hardness, friability, roughness, etc ...).

Les couches (3, 5) formées à partir de ces grains abrasifs peuvent être constitués de grains abrasifs de différentes dimensions, dont la taille moyenne est généralement définie par l'homme du métier par le terme « grit », ou d'un mélange de grains de différentes dimensions. La taille moyenne des grains abrasifs est, selon un mode possible de réalisation de l'invention, comprise entre 1035 µm (grit 24) et 122 µm (grit 150).The layers (3, 5) formed from these abrasive grains may consist of abrasive grains of different sizes, the average size of which is generally defined by those skilled in the art by the term "grit", or a mixture of grains of different sizes. The average size of the abrasive grains is, according to a possible embodiment of the invention, between 1035 microns (grit 24) and 122 microns (grit 150).

Par exemple, les couches (3, 5) peuvent être formées à partir des grains abrasifs liés entre eux par un liant composé de diverses résines phénoliques en poudre (par exemple Novolak) et/ou en liquide (par exemple Resole) ainsi qu'avec, éventuellement, des additifs ou des charges. Par exemple, les charges ou additifs utilisées peuvent être majoritairement constitués de sulfures de fer, de fluorure double d'aluminium et de potassium, de sulfate de potassium ou de carbonate de calcium (chaux).For example, the layers (3, 5) may be formed from the abrasive grains bonded together by a binder composed of various phenolic powder resins (eg Novolak) and / or in liquid (eg Resole) as well as possibly with additives or fillers. For example, the fillers or additives used may be mainly composed of iron sulphides, aluminum and potassium double fluoride, potassium sulphate or calcium carbonate (lime).

Selon l'invention, la zone de travail Z présente une épaisseur totale e inférieure à 4 mm, et de préférence inférieure ou égale à 3,2 mm et supérieure à 2 mm.According to the invention, the working zone Z has a total thickness e of less than 4 mm, and preferably less than or equal to 3.2 mm and greater than 2 mm.

La meule (1) présente trois secteurs de travail (S1, S2, S3) adjacents deux à deux : les secteurs S1 et S3 correspondent aux surfaces principales de travail et le secteur S2 correspond au chant extérieur de la meule.The grinding wheel (1) has three working areas (S1, S2, S3) adjacent in pairs: the sectors S1 and S3 correspond to the main working surfaces and the sector S2 corresponds to the outer edge of the grinding wheel.

Une meule a été réalisée présentant la structure illustrée sur la figure 1.A grinding wheel was made presenting the structure illustrated on the figure 1 .

Le mélange de grains utilisé dans chaque couche (3,5) est constitué de deux types de grains, l'un présentant une taille moyenne de 508 µm (grit 46) représentant 85 % en volume du volume total du mélange des grains abrasifs et l'autre présentant une taille moyenne de 406 µm (grit 60) représentant 15 % en volume du volume total du mélange des grains abrasifs.The mixture of grains used in each layer (3,5) consists of two types of grains, one having an average size of 508 μm (grit 46) representing 85% by volume of the total volume of the mixture of abrasive grains and 1 another having an average size of 406 μm (grit 60) representing 15% by volume of the total volume of the mixture of abrasive grains.

Le liant utilisé dans chaque couche (3,5) est constituée de 65 % en volume de résine phénolique (liquide + poudre à 15 % massique d'hexamethylenetétramine) et de charges : 15 % volumique de sulfure de fer, 18 % volumique de sulfates de potassium et 2 % volumique de chaux.The binder used in each layer (3.5) consists of 65% by volume of phenolic resin (liquid + 15% by weight hexamethylenetetramine powder) and fillers: 15% by volume of iron sulphide, 18% by volume of sulphates of potassium and 2% by volume of lime.

Chaque couche (3,5) est ainsi constituée d'environ 44 % en volume de grains abrasifs, de 46 % en volume de liant, le reste étant de la porosité.Each layer (3.5) thus consists of approximately 44% by volume of abrasive grains, 46% by volume of binder, the rest being porosity.

Le tissu utilisé pour les couches (2, 4, 6) présente respectivement un grammage de 195, 170 et 195 grammes par mètre carré.The fabric used for the layers (2, 4, 6) has a basis weight of 195, 170 and 195 grams per square meter, respectively.

L'ensemble des constituants a subi une étape de pressage à froid pour former la meule, puis une étape de cuisson conforme aux techniques de l'art.All the constituents underwent a cold pressing step to form the grinding wheel, then a firing step in accordance with the techniques of the art.

Cette meule présente après fabrication une épaisseur e d'environ 2,5 mm et un diamètre hors tout de 125 mm.This grinding wheel has after manufacture a thickness e of about 2.5 mm and an overall diameter of 125 mm.

Cette meule, bien que ne présentant pas l'épaisseur requise par la norme ISO 525 pour une meule d'ébarbage, a satisfait tous les tests de sécurité de la norme EN 12413 concernant les meules d'ébarbage du type 27, 28 et 29.This grinding wheel, although not having the thickness required by ISO 525 for a grinding wheel, has satisfied all the safety tests of the EN 12413 standard for grinding wheels type 27, 28 and 29.

Elle a en particulier satisfait le test de vitesse d'éclatement puisqu'elle n'a éclaté qu'à la vitesse (VBR) d'environ 190 m/s (la norme exige une résistance à une vitesse d'au moins 150 m/s).In particular, it has satisfied the burst speed test since it has burst only at the speed (V BR ) of approximately 190 m / s (the standard requires resistance at a speed of at least 150 m / s).

Pour le test de résistance à un impact latéral unique (Force FS1), elle a résisté à une force de 290 N exigée par la norme.For the single side impact resistance test (Force F S1 ), it withstood a 290 N force required by the standard.

La présente invention est décrite dans ce qui précède à titre d'exemple. Il est entendu que l'homme du métier est à même de réaliser différentes variantes de l'invention sans pour autant sortir du cadre du brevet tel que défini par les revendications.The present invention is described in the foregoing by way of example. It is understood that the skilled person is able to achieve different variants of the invention without departing from the scope of the patent as defined by the claims.

Claims (5)

  1. Grinding wheel (1) for trimming, in the form of a disc, said wheel having a central axis X, a central fastening zone F and at least one peripheral working zone Z extending to the outside of the central fastening zone relative to the central axis, said wheel comprising at least two layers (3, 5) formed from abrasive grains, each of these layers being flanked by two layers not containing abrasive grains (2, 4, 6), and two layers (2, 6) not containing abrasive grains flanking the wheel, characterized in that the working zone Z has a total thickness e of more than 2 mm and of less than 4 mm and preferably equal to 3.2 mm or less, and in that it has at least two adjacent working sectors (S1, S2) and preferably three pairwise adjacent working sectors (S1, S2, S3), the working sectors (S1, S2, S3) being substantially pairwise perpendicular.
  2. Wheel (1) according to Claim 1, characterized in that it has a thickness e especially of 2.5 mm or 3.2 mm.
  3. Wheel (1) according to any one of the preceding claims, characterized in that at least one outer layer (2, 6) not containing abrasive grains, or even both outer layers (2, 6) not containing abrasive grains has or have a smaller diameter than the total diameter of the wheel.
  4. Process for manufacturing a grinding wheel (1) for trimming according to any one of Claims 1 to 3, in the form of a disc, in which process:
    - a layer (3, 5) based on abrasive grains is formed directly in a mould in the absence of a subjacent reinforcing layer;
    - optionally, a reinforcing layer is deposited on this layer of abrasive grains;
    - the layer or layers are pressed in order to form a cake;
    - the cake is removed from the mould;
    - the cake is assembled with:
    - either one or both reinforcing layers, so that two reinforcing layers flank the wheel
    - or at least one other cake and at least one or both reinforcing layers so that two reinforcing layers flank the wheel; and
    - the assembly is pressed so as to form the wheel.
  5. Use of a wheel (1) according to any one of Claims 1 to 3, in order to carry out a trimming operation.
EP07731681A 2006-03-06 2007-03-01 Fine fettling wheel, use of said wheel, and method for producing the same Revoked EP1993786B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SI200730880T SI1993786T1 (en) 2006-03-06 2007-03-01 Fine fettling wheel, use of said wheel, and method for producing the same
PL07731681T PL1993786T3 (en) 2006-03-06 2007-03-01 Fine fettling wheel, use of said wheel, and method for producing the same

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0650776A FR2898070B1 (en) 2006-03-06 2006-03-06 FINE BEARING WHEEL, USE THEREOF, METHOD AND DEVICE FOR MANUFACTURING THE SAME
PCT/FR2007/050864 WO2007101957A2 (en) 2006-03-06 2007-03-01 Fine fettling wheel, use of said wheel, and method and device for producing the same

Publications (2)

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EP1993786A2 EP1993786A2 (en) 2008-11-26
EP1993786B1 true EP1993786B1 (en) 2011-12-14

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EP07731681A Revoked EP1993786B1 (en) 2006-03-06 2007-03-01 Fine fettling wheel, use of said wheel, and method for producing the same

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EP (1) EP1993786B1 (en)
JP (2) JP5503150B2 (en)
KR (1) KR101333329B1 (en)
CN (1) CN101394972B (en)
AT (1) ATE536960T1 (en)
AU (1) AU2007222236B2 (en)
BR (1) BRPI0707966B1 (en)
CA (1) CA2644859C (en)
DE (1) DE202007019685U1 (en)
DK (1) DK1993786T3 (en)
ES (1) ES2379114T3 (en)
FR (1) FR2898070B1 (en)
MX (1) MX2008011327A (en)
NO (1) NO20084163L (en)
NZ (1) NZ569257A (en)
PL (1) PL1993786T3 (en)
PT (1) PT1993786E (en)
SI (1) SI1993786T1 (en)
TW (2) TWI494193B (en)
WO (1) WO2007101957A2 (en)
ZA (1) ZA200806437B (en)

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EP3421178A1 (en) * 2017-06-26 2019-01-02 Dronco GmbH Method of manufacturing an abrasive member, in particular rotary abrasive disc and abrasive member, in particular rotary abrasive disc
CN107225515B (en) * 2017-07-11 2023-06-30 苏州精协机械制造有限公司 Combined multi-line grinding wheel of extrusion tap thread grinder
CN107378806A (en) * 2017-07-20 2017-11-24 江苏苏北砂轮厂有限公司 High thickness emery wheel
CH715030B1 (en) * 2018-05-29 2020-09-30 Reishauer Ag Process for the production of thin abrasive articles.
CN109202751A (en) * 2018-08-07 2019-01-15 安徽砥钻砂轮有限公司 A kind of resin wheel of cutting-grinding dual-purpose
CN108972375B (en) * 2018-08-27 2024-03-26 洛阳希微磨料磨具有限公司 Multilayer ceramic bond grinding wheel and preparation method thereof
CN114029873A (en) * 2021-10-27 2022-02-11 宁波大华砂轮有限公司 A kind of angle grinder and preparation method thereof
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Also Published As

Publication number Publication date
JP2012232411A (en) 2012-11-29
AU2007222236B2 (en) 2012-10-04
EP1993786A2 (en) 2008-11-26
DE202007019685U1 (en) 2015-08-03
TWI494193B (en) 2015-08-01
PT1993786E (en) 2012-03-15
WO2007101957A3 (en) 2007-10-25
JP5503150B2 (en) 2014-05-28
FR2898070A1 (en) 2007-09-07
NZ569257A (en) 2012-01-12
ES2379114T3 (en) 2012-04-20
ZA200806437B (en) 2009-07-29
ATE536960T1 (en) 2011-12-15
WO2007101957A2 (en) 2007-09-13
PL1993786T3 (en) 2012-05-31
JP2009528924A (en) 2009-08-13
CN101394972A (en) 2009-03-25
CA2644859C (en) 2014-07-08
DK1993786T3 (en) 2012-04-02
TW200812756A (en) 2008-03-16
BRPI0707966A2 (en) 2011-05-17
AU2007222236A1 (en) 2007-09-13
FR2898070B1 (en) 2009-01-09
CN101394972B (en) 2013-03-27
NO20084163L (en) 2008-10-03
JP5506064B2 (en) 2014-05-28
KR101333329B1 (en) 2013-11-25
BRPI0707966B1 (en) 2020-03-31
KR20080105057A (en) 2008-12-03
TW201440959A (en) 2014-11-01
MX2008011327A (en) 2008-09-19
TWI492821B (en) 2015-07-21
SI1993786T1 (en) 2012-08-31
CA2644859A1 (en) 2007-09-13

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