EP1262282A1 - Economical abrading tool and method of manufacture - Google Patents

Economical abrading tool and method of manufacture Download PDF

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Publication number
EP1262282A1
EP1262282A1 EP02291272A EP02291272A EP1262282A1 EP 1262282 A1 EP1262282 A1 EP 1262282A1 EP 02291272 A EP02291272 A EP 02291272A EP 02291272 A EP02291272 A EP 02291272A EP 1262282 A1 EP1262282 A1 EP 1262282A1
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EP
European Patent Office
Prior art keywords
abrasive grains
grains
abrasive
abrasion device
abrasion
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.)
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EP02291272A
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German (de)
French (fr)
Inventor
Georges Henri Broido
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Lam Plan SA
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Lam Plan SA
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Publication date
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Publication of EP1262282A1 publication Critical patent/EP1262282A1/en
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    • 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
    • B24D18/009—Tools not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D11/00—Constructional features of flexible abrasive materials; Special features in the manufacture of such materials
    • B24D11/001—Manufacture of flexible abrasive materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
    • B24D3/02—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent
    • B24D3/20—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially organic
    • B24D3/28—Resins or natural or synthetic macromolecular compounds

Definitions

  • the present invention relates, in general, the technical field of abrasion.
  • the invention relates, according to a first of its aspects, an abrasion device comprising a support, produced by hardening a variable viscosity material, and abrasive grains included in the holder.
  • Devices of this type which often adopt the shape of discs or cylinders to be able to be suitable for rotary tools, but which can take other shapes adaptable to power tools or manual and rotary or not, are well known to man art.
  • the invention has precisely for aim of proposing an abrasion device meeting this need, as well as an efficient manufacturing process for this device.
  • each abrasive grain includes an abrasive core coated with a metal or a metal alloy sensitive to a magnetic attraction, and in that the grains abrasives gather in areas of concentration in relatively strong abrasive grains, separated one from the other others by grain concentration zones relatively weak abrasives.
  • the support advantageously comprises a surface layer and a deep layer, the deep layer being free of abrasive grains.
  • the grain concentration zones relatively weak abrasives, or at least some of these areas are preferably free of grains abrasives.
  • the areas of relatively strong concentration form one or more arrangements of parallel lines or curves to others.
  • variable viscosity material can be a polymerizable resin, for example polyester or polyurethane.
  • the abrasive grains have a larger dimension substantially perpendicular to the surface layer.
  • the abrasive grains are flush with the surface of the support.
  • the invention also relates to a method of manufacturing an abrasion device, this process including the steps of: preparing a mold delimited at least by a bottom and an edge, the bottom forming a surface subjected to a magnetic field with variations in intensity and / or polarity along at least one dimension of this surface; sprinkle abrasive grains on the bottom of the mold each of which includes a metal coated abrasive core or a metal alloy sensitive to an attraction magnetic; pour into the pan, over the beans abrasives, a hardenable material taken in a state fluid or soft, resulting in grain inclusion abrasives in the material; wait for the hardening of the curable material, which results, between the grains abrasives and the material, a cohesion which combines them in the same abrasion device; and unmold the device abrasion.
  • the abrasive grains are sprinkled on the bottom of the mold in insufficient quantity to form a single layer of abrasive grains over the entire bottom.
  • This process can also include a step consisting in shaking the mold before pouring the material curable, this step can in particular be implemented works while the abrasive grains are sprinkled on the bottom of the mold and / or after this operation of dusting.
  • This manufacturing process can finally include the use, as a mold base, of a plate or rubber sheet in which are embedded magnets or magnetic particles.
  • this method uses a mold 3, delimited by a bottom 30 and by an edge 31.
  • the bottom 30 of the mold 3 forms a surface 300, which is subjected to a magnetic field with a spatial modulation, i.e. variations of intensity and / or polarity along an L dimension at least of this surface 300.
  • the bottom 30 of the mold is for example consisting of a plate or sheet of rubber 301, in which are embedded magnets or particles magnetized 302, such plates or sheets being especially commercially available.
  • the background may also include a magnetic plate.
  • Abrasive grains 2 are then sprinkled on the bottom 30 of the mold 3, preferably in quantity less than would be required to form a single layer of abrasive grains 2 over the entire surface 300 from the bottom 30.
  • the abrasive grains 2 are in fact adapted to the implementation of the invention, each of these grains comprising an abrasive core 20 coated with a metal or a metal alloy 21 sensitive to attraction magnetic.
  • Such abrasive grains are known in the art earlier, and for example marketed by the Company De Beers, the coating metal so far used for its heat diffusion properties and for maintaining the cohesion of the abrasive core 20.
  • the mold 3 can be shaken so as to ensure a regular distribution of grains 2 opposite the magnets or magnetic particles 302, provided that such a distribution is sought without being directly obtained by dusting.
  • a weight can then be placed on the layer of resin to promote the penetration of abrasive grains in subject 10, and especially to avoid possible deformations that could cause the removal of the resin during polymerization.
  • variable viscosity material 10 is preferably consisting of a polymerizable resin cold or hot, such as polyester or polyurethane, in which are advantageously incorporated various adjuvants, such as a catalyst polymerization, a polymerization accelerator, a dye, etc., in a manner known per se.
  • a polymerizable resin cold or hot such as polyester or polyurethane
  • various adjuvants such as a catalyst polymerization, a polymerization accelerator, a dye, etc.
  • the hardening of the hardenable material 10 has for effect of ensuring cohesion between the abrasive grains 2 and the material 10, the product thus formed constituting a abrasion device 4 which can be removed from the mold 3.
  • the previously described process provides a abrasion device in which abrasive grains 2 are included in a support 1, forming a binder and resulting of the hardening of the material 10, so that these abrasive grains 2 gather in zones Z1 of relatively high concentration of abrasive grains, separated from each other by zones Z0 of relatively low abrasive grain concentration.
  • the local concentration and the distribution of abrasive grains 2 directly depend local concentration and distribution of magnets or magnetic particles 302 in the bottom 30 of the mold 3.
  • zones Z0 of relatively low grain concentration abrasives that are actually completely grain-free abrasives By providing, in the bottom 30, free zones of magnets or magnetized particles 302, so it's possible to obtain, in the abrasion device 4, zones Z0 of relatively low grain concentration abrasives that are actually completely grain-free abrasives 2.
  • the zones Z1 of relatively high concentration in abrasive grains 2 form one or more arrangements of lines or curves parallel to each other, such that the arrangements A1 to A4 illustrated in FIG. 3, the arrangement A1 of FIG. 4, or again the arrangements A1 to A3 of figure 5.
  • zones Z1 and Z0 Thanks to the alternation of zones Z1 and Z0, in fact that Z0 zones by definition less hard than zones Z1, wear out faster than the latter, and by the way regulator that the wear of zones Z0 cannot however precede, in thickness, the wear of zones Z1 by only one quantity limited inter alia by the hardness of the part abraded, new leading edges offered by abrasive grains 2 present in zones Z1 are discovered as the device wears down abrasion of the invention, which guarantees efficiency optimal of the latter until its total wear.
  • the abrasive grains 2 are concentrated (FIG. 2) in a surface layer 11 of support 1, the deep layer 12 of this support being free of abrasive grains 2, except accident or imperfection of casting of the binding material 10.
  • the grains abrasives have a natural tendency under the effect of magnetic field, to orient themselves so that their most large dimension be substantially perpendicular to the outer surface of the surface layer, which further increases the cohesion between the support 1 and the abrasive grains 2, as well as the longevity of the device abrasion.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Abstract

The abrasive material consists of a self-hardening backing layer (1) of variable viscosity, and abrasive grains. The abrasive material consists of a self-hardening backing layer (1) of variable viscosity, and abrasive grains. Each grain has an abrasive core (20) coated with a metal or metallic alloy (21) which has a strong susceptibility to magnetic attraction. The grains collect in zones (Z1) where relatively strong grains are concentrated, separated by zones (Z0) of concentration of relatively weak grains. The material is made in a mould with a sheet of rubber in its base, in which magnets or magnetic particles are embedded. The abrasive grains, e.g. of natural or synthetic diamond in a metal coating, are then scattered over the base and a self-setting material such as a polymerizable resin is poured over them, and can be covered by a weight to promote penetration of the grains.

Description

La présente invention concerne, de façon générale, le domaine technique de l'abrasion.The present invention relates, in general, the technical field of abrasion.

Plus précisément, l'invention concerne, selon un premier de ses aspects, un dispositif d'abrasion comprenant un support, réalisé par durcissement d'une matière à viscosité variable, et des grains abrasifs inclus dans le support.More specifically, the invention relates, according to a first of its aspects, an abrasion device comprising a support, produced by hardening a variable viscosity material, and abrasive grains included in the holder.

Des dispositifs de ce type, qui adoptent souvent la forme de disques ou de cylindres pour pouvoir être adaptés sur des outils rotatifs, mais qui peuvent prendre d'autres formes adaptables à des outils motorisés ou manuels et rotatifs ou non, sont bien connus de l'homme de l'art.Devices of this type, which often adopt the shape of discs or cylinders to be able to be suitable for rotary tools, but which can take other shapes adaptable to power tools or manual and rotary or not, are well known to man art.

Leur conception est également connue pour poser depuis longtemps un problème d'efficacité, qui est lié au coût généralement élevé des matériaux abrasifs utilisés.Their design is also known to pose an efficiency problem, which has been linked to generally high cost of the abrasive materials used.

Dans la mesure en effet où ces matériaux sont le plus souvent à base de cristaux de dureté exceptionnelle, par exemple de diamants, il est crucial de faire en sorte que les dispositifs d'abrasion qui en font usage utilisent ces matériaux abrasifs jusqu'au bout de leur capacité d'abrasion, sans pour autant manifester un déclin substantiel de leur efficacité d'abrasion avant leur remplacement.Insofar as these materials are the more often based on crystals of exceptional hardness, for example of diamonds it is crucial to make sure that the abrasion devices that make use of it use these abrasive materials to the end of their abrasion capacity, without showing any substantial decline in their abrasion efficiency before replacing them.

Dans ce contexte, l'invention a précisément pour but de proposer un dispositif d'abrasion répondant à ce besoin, ainsi qu'un procédé efficace de fabrication de ce dispositif.In this context, the invention has precisely for aim of proposing an abrasion device meeting this need, as well as an efficient manufacturing process for this device.

A cette fin, le dispositif selon l'invention, par ailleurs conforme à la définition générique qu'en donne le préambule ci-dessus, est essentiellement caractérisé en ce que chaque grain abrasif comprend un noyau abrasif enrobé d'un métal ou d'un alliage métallique sensible à une attraction magnétique, et en ce que les grains abrasifs se rassemblent dans des zones de concentration en grains abrasifs relativement forte, séparées les unes des autres par des zones de concentration en grains abrasifs relativement faible.To this end, the device according to the invention, by elsewhere conforms to the generic definition given by it the preamble above, is essentially characterized in that each abrasive grain includes an abrasive core coated with a metal or a metal alloy sensitive to a magnetic attraction, and in that the grains abrasives gather in areas of concentration in relatively strong abrasive grains, separated one from the other others by grain concentration zones relatively weak abrasives.

Par ailleurs, le support comprend avantageusement une couche superficielle et une couche profonde, la couche profonde étant exempte de grains abrasifs.Furthermore, the support advantageously comprises a surface layer and a deep layer, the deep layer being free of abrasive grains.

De même, les zones de concentration en grains abrasifs relativement faible, ou au moins certaines de ces zones, sont de préférence exemptes de grains abrasifs.Likewise, the grain concentration zones relatively weak abrasives, or at least some of these areas are preferably free of grains abrasives.

Dans un mode de réalisation possible, les zones de concentration relativement forte forment un ou plusieurs arrangements de lignes ou de courbes parallèles les unes aux autres.In one possible embodiment, the areas of relatively strong concentration form one or more arrangements of parallel lines or curves to others.

La matière à viscosité variable peut être une résine polymérisable, par exemple un polyester ou un polyuréthane.The variable viscosity material can be a polymerizable resin, for example polyester or polyurethane.

Par ailleurs, les grains abrasifs présentent une plus grande dimension sensiblement perpendiculaire à la couche superficielle.Furthermore, the abrasive grains have a larger dimension substantially perpendicular to the surface layer.

Avantageusement, les grains abrasifs affleurent à la surface du support.Advantageously, the abrasive grains are flush with the surface of the support.

L'invention concerne également un procédé de fabrication d'un dispositif d'abrasion, ce procédé comprenant notamment les étapes consistant à : préparer un moule délimité au moins par un fond et un bord, le fond formant une surface soumise à un champ magnétique présentant des variations d'intensité et / ou de polarité le long d'au moins une dimension de cette surface; saupoudrer, sur le fond du moule, des grains abrasifs dont chacun comprend un noyau abrasif enrobé d'un métal ou d'un alliage métallique sensible à une attraction magnétique; verser dans le moule, sur les grains abrasifs, une matière durcissable prise dans un état fluide ou mou, ce dont résulte une inclusion des grains abrasifs dans la matière; attendre le durcissement de la matière durcissable, ce dont résulte, entre les grains abrasifs et la matière, une cohésion qui les combine en un même dispositif d'abrasion; et démouler le dispositif d'abrasion.The invention also relates to a method of manufacturing an abrasion device, this process including the steps of: preparing a mold delimited at least by a bottom and an edge, the bottom forming a surface subjected to a magnetic field with variations in intensity and / or polarity along at least one dimension of this surface; sprinkle abrasive grains on the bottom of the mold each of which includes a metal coated abrasive core or a metal alloy sensitive to an attraction magnetic; pour into the pan, over the beans abrasives, a hardenable material taken in a state fluid or soft, resulting in grain inclusion abrasives in the material; wait for the hardening of the curable material, which results, between the grains abrasives and the material, a cohesion which combines them in the same abrasion device; and unmold the device abrasion.

De préférence, les grains abrasifs sont saupoudrés sur le fond du moule en quantité insuffisante pour former une couche unique de grains abrasifs sur tout le fond.Preferably, the abrasive grains are sprinkled on the bottom of the mold in insufficient quantity to form a single layer of abrasive grains over the entire bottom.

Ce procédé peut aussi comprendre une étape consistant à secouer le moule avant de verser la matière durcissable, cette étape pouvant notamment être mise en oeuvre pendant que les grains abrasifs sont saupoudrés sur le fond du moule et / ou après cette opération de saupoudrage.This process can also include a step consisting in shaking the mold before pouring the material curable, this step can in particular be implemented works while the abrasive grains are sprinkled on the bottom of the mold and / or after this operation of dusting.

Ce procédé de fabrication peut enfin comprendre l'utilisation, en tant que fond de moule, d'une plaque ou feuille de caoutchouc dans laquelle sont noyés des aimants ou des particules aimantées.This manufacturing process can finally include the use, as a mold base, of a plate or rubber sheet in which are embedded magnets or magnetic particles.

D'autres caractéristiques et avantages de l'invention ressortiront clairement de la description qui en est faite ci-après, à titre indicatif et nullement limitatif, en référence aux dessins annexés, dans lesquels:

  • la Figure 1 est une vue en coupe d'un matériel opératoire pour la mise en oeuvre du procédé de l'invention;
  • la Figure 2 est une vue en coupe partielle agrandie d'un dispositif d'abrasion conforme à l'invention;
  • la Figure 3 est une vue de dessus schématique d'un dispositif d'abrasion conforme à l'invention, illustrant un motif possible et non limitatif de distribution des grains abrasifs dans le support;
  • la Figure 4 est une vue en perspective d'un dispositif d'abrasion conforme à l'invention, prenant la forme d'un disque et utilisant un autre motif possible et non limitatif de distribution des grains abrasifs dans le support; et
  • la Figure 5 est une vue de dessus schématique d'un dispositif d'abrasion conforme à l'invention, illustrant encore un autre motif possible et non limitatif de distribution des grains abrasifs dans le support.
Other characteristics and advantages of the invention will emerge clearly from the description given below, by way of indication and in no way limitative, with reference to the appended drawings, in which:
  • Figure 1 is a sectional view of an operating material for the implementation of the method of the invention;
  • Figure 2 is an enlarged partial sectional view of an abrasion device according to the invention;
  • Figure 3 is a schematic top view of an abrasion device according to the invention, illustrating a possible and non-limiting pattern of distribution of the abrasive grains in the support;
  • Figure 4 is a perspective view of an abrasion device according to the invention, taking the form of a disc and using another possible and non-limiting pattern of distribution of the abrasive grains in the support; and
  • Figure 5 is a schematic top view of an abrasion device according to the invention, illustrating yet another possible and non-limiting pattern of distribution of the abrasive grains in the support.

Pour simplifier la compréhension de l'invention, la présente description s'attachera tout d'abord à exposer le procédé recommandé pour la fabrication du dispositif d'abrasion de l'invention.To simplify the understanding of the invention, the this description will first focus on exposing the recommended process for manufacturing the device abrasion of the invention.

Comme le montre la figure 1, ce procédé utilise un moule 3, délimité par un fond 30 et par un bord 31.As shown in Figure 1, this method uses a mold 3, delimited by a bottom 30 and by an edge 31.

Le fond 30 du moule 3 forme une surface 300, qui est soumise à un champ magnétique présentant une modulation spatiale, c'est-à-dire des variations d'intensité et / ou de polarité le long d'une dimension L au moins de cette surface 300.The bottom 30 of the mold 3 forms a surface 300, which is subjected to a magnetic field with a spatial modulation, i.e. variations of intensity and / or polarity along an L dimension at least of this surface 300.

Pour ce faire, le fond 30 de moule est par exemple constitué d'une plaque ou feuille de caoutchouc 301, dans laquelle sont noyés des aimants ou des particules aimantées 302, de telles plaques ou feuilles étant notamment disponibles dans le commerce.To do this, the bottom 30 of the mold is for example consisting of a plate or sheet of rubber 301, in which are embedded magnets or particles magnetized 302, such plates or sheets being especially commercially available.

En variante, le fond peut aussi comprendre un plateau magnétique.Alternatively, the background may also include a magnetic plate.

Des grains abrasifs 2 sont ensuite saupoudrés sur le fond 30 du moule 3, de préférence en quantité inférieure à celle qui serait nécessaire pour former une couche unique de grains abrasifs 2 sur toute la surface 300 du fond 30.Abrasive grains 2 are then sprinkled on the bottom 30 of the mold 3, preferably in quantity less than would be required to form a single layer of abrasive grains 2 over the entire surface 300 from the bottom 30.

Les grains abrasifs 2 sont en fait adaptés à la mise en oeuvre de l'invention, chacun de ces grains comprenant un noyau abrasif 20 enrobé d'un métal ou d'un alliage métallique 21 sensible à une attraction magnétique.The abrasive grains 2 are in fact adapted to the implementation of the invention, each of these grains comprising an abrasive core 20 coated with a metal or a metal alloy 21 sensitive to attraction magnetic.

Il est en particulier possible d'utiliser des diamants naturels ou synthétiques enrobés de nickel ou de tout autre métal ou alliage à forte susceptibilité magnétique.In particular, it is possible to use natural or synthetic diamonds coated with nickel or any other metal or alloy with high susceptibility magnetic.

De tels grains abrasifs sont connus dans l'art antérieur, et par exemple commercialisés par la Société De Beers, le métal d'enrobage étant jusqu'à présent employé pour ses propriétés de diffusion de la chaleur et de maintien de la cohésion du noyau abrasif 20.Such abrasive grains are known in the art earlier, and for example marketed by the Company De Beers, the coating metal so far used for its heat diffusion properties and for maintaining the cohesion of the abrasive core 20.

Pendant le saupoudrage des grains abrasifs 2, ou avant la poursuite du procédé, le moule 3 peut être secoué de manière à assurer une répartition régulière des grains 2 en regard des aimants ou particules aimantées 302, pour autant qu'une telle répartition soit recherchée sans être directement obtenue par le saupoudrage.During the dusting of the abrasive grains 2, or before the process continues, the mold 3 can be shaken so as to ensure a regular distribution of grains 2 opposite the magnets or magnetic particles 302, provided that such a distribution is sought without being directly obtained by dusting.

Une matière durcissable 10, prise dans un état fluide ou mou, est ensuite versée dans le moule 3, sur les grains abrasifs 2 (figure 1), de sorte que les grains abrasifs 2 forment des inclusions dans la matière 10.A curable material 10, taken in a state fluid or soft, is then poured into the mold 3, on the abrasive grains 2 (FIG. 1), so that the grains abrasives 2 form inclusions in material 10.

Un poids peut alors être placé sur la couche de résine pour favoriser la pénétration des grains abrasifs dans la matière 10, et surtout pour éviter les éventuelles déformations que pourrait entraíner le retrait de la résine au cours de la polymérisation.A weight can then be placed on the layer of resin to promote the penetration of abrasive grains in subject 10, and especially to avoid possible deformations that could cause the removal of the resin during polymerization.

La matière à viscosité variable 10 est de préférence constituée par une résine polymérisable à froid ou à chaud, telle qu'un polyester ou un polyuréthane, dans laquelle sont avantageusement incorporés divers adjuvants, tels qu'un catalyseur de polymérisation, un accélérateur de polymérisation, un colorant, etc., de façon connue en soi.The variable viscosity material 10 is preferably consisting of a polymerizable resin cold or hot, such as polyester or polyurethane, in which are advantageously incorporated various adjuvants, such as a catalyst polymerization, a polymerization accelerator, a dye, etc., in a manner known per se.

Le durcissement de la matière durcissable 10 a pour effet d'assurer la cohésion entre les grains abrasifs 2 et la matière 10, le produit ainsi formé constituant un dispositif d'abrasion 4 qui peut être démoulé du moule 3.The hardening of the hardenable material 10 has for effect of ensuring cohesion between the abrasive grains 2 and the material 10, the product thus formed constituting a abrasion device 4 which can be removed from the mold 3.

Le procédé précédemment décrit permet d'obtenir un dispositif d'abrasion dans lequel des grains abrasifs 2 sont inclus dans un support 1, formant liant et résultant du durcissement de la matière 10, de manière telle que ces grains abrasifs 2 se rassemblent dans des zones Z1 de concentration en grains abrasifs relativement forte, séparées les unes des autres par des zones Z0 de concentration en grains abrasifs relativement faible. The previously described process provides a abrasion device in which abrasive grains 2 are included in a support 1, forming a binder and resulting of the hardening of the material 10, so that these abrasive grains 2 gather in zones Z1 of relatively high concentration of abrasive grains, separated from each other by zones Z0 of relatively low abrasive grain concentration.

Dans le cas où le produit est obtenu par le procédé précédemment décrit, la concentration locale et la distribution des grains abrasifs 2 dépendent directement de la concentration locale et de la distribution des aimants ou particules aimantées 302 dans le fond 30 du moule 3.In case the product is obtained by the process previously described, the local concentration and the distribution of abrasive grains 2 directly depend local concentration and distribution of magnets or magnetic particles 302 in the bottom 30 of the mold 3.

En prévoyant, dans le fond 30, des zones exemptes d'aimants ou de particules aimantées 302, il est donc possible d'obtenir, dans le dispositif d'abrasion 4, des zones Z0 de concentration relativement faible en grains abrasifs qui soient en fait totalement exemptes de grains abrasifs 2.By providing, in the bottom 30, free zones of magnets or magnetized particles 302, so it's possible to obtain, in the abrasion device 4, zones Z0 of relatively low grain concentration abrasives that are actually completely grain-free abrasives 2.

De la même façon, il est possible de faire en sorte que les zones Z1 de concentration relativement forte en grains abrasifs 2 forment un ou plusieurs arrangements de lignes ou de courbes parallèles les unes aux autres, tels que les arrangements A1 à A4 illustrés à la figure 3, l'arrangement A1 de la figure 4, ou encore les arrangements A1 à A3 de la figure 5.In the same way, it is possible to make sure that the zones Z1 of relatively high concentration in abrasive grains 2 form one or more arrangements of lines or curves parallel to each other, such that the arrangements A1 to A4 illustrated in FIG. 3, the arrangement A1 of FIG. 4, or again the arrangements A1 to A3 of figure 5.

Grâce à l'alternance des zones Z1 et Z0, au fait que les zones Z0 par définition moins dures que les zones Z1, s'usent plus vite que ces dernières, et au fait régulateur que l'usure des zones Z0 ne peut cependant précéder, en épaisseur, l'usure des zones Z1 que d'une quantité limitée entre autres par la dureté de la pièce abrasée, de nouveaux bords d'attaque offerts par des grains abrasifs 2 présents dans les zones Z1 sont découverts au fur et à mesure de l'usure du dispositif d'abrasion de l'invention, ce qui garantit une efficacité optimale de ce dernier jusqu'à son usure totale.Thanks to the alternation of zones Z1 and Z0, in fact that Z0 zones by definition less hard than zones Z1, wear out faster than the latter, and by the way regulator that the wear of zones Z0 cannot however precede, in thickness, the wear of zones Z1 by only one quantity limited inter alia by the hardness of the part abraded, new leading edges offered by abrasive grains 2 present in zones Z1 are discovered as the device wears down abrasion of the invention, which guarantees efficiency optimal of the latter until its total wear.

Par ailleurs, et notamment dans le cas où le produit est obtenu par le procédé précédemment décrit, les grains abrasifs 2 se concentrent (figure 2) dans une couche superficielle 11 du support 1, la couche profonde 12 de ce support étant exempte de grains abrasifs 2, sauf accident ou imperfection de coulée de la matière liante 10. Furthermore, and in particular in the case where the product is obtained by the process previously described, the abrasive grains 2 are concentrated (FIG. 2) in a surface layer 11 of support 1, the deep layer 12 of this support being free of abrasive grains 2, except accident or imperfection of casting of the binding material 10.

Dans ces conditions, non seulement le degré d'usure du dispositif de l'invention est aisé à vérifier, ce qui écarte le risque de rebut précoce d'un dispositif encore opérationnel, mais il est en outre possible de réaliser des dispositifs d'abrasion ne contenant que peu de grains abrasifs, donc relativement peu coûteux. Ce dispositif peut alors être très mince, puisque tous les grains sont concentrés dans sa couche superficielle.In these conditions, not only the degree of wear of the device of the invention is easy to verify, which eliminates the risk of early disposal of a device again operational, but it is also possible to realize abrasion devices containing only a few grains abrasive, therefore relatively inexpensive. These measures can then be very thin, since all the grains are concentrated in its surface layer.

De plus, comme le montre la figure 2, les grains abrasifs ont une tendance naturelle, sous l'effet du champ magnétique, à s'orienter de manière que leur plus grande dimension soit sensiblement perpendiculaire à la surface externe de la couche superficielle, ce qui augmente encore la cohésion entre le support 1 et les grains abrasifs 2, ainsi que la longévité du dispositif d'abrasion.In addition, as shown in Figure 2, the grains abrasives have a natural tendency under the effect of magnetic field, to orient themselves so that their most large dimension be substantially perpendicular to the outer surface of the surface layer, which further increases the cohesion between the support 1 and the abrasive grains 2, as well as the longevity of the device abrasion.

Enfin, on notera que dans le produit obtenu par le procédé décrit plus haut, les grains sont engoncés dans la matière et affleurent à la surface du support. Ils ne font saillie sur une faible partie de leur hauteur. On obtient ainsi des produits bien adaptés pour une abrasion douce, qui enlève peu de matière et laisse la surface de la pièce traitée dans un état assez lisse.Finally, it will be noted that in the product obtained by the process described above, the grains are stuck in the material and are flush with the surface of the support. They don't protrude over a small part of their height. We thus obtains products well suited for abrasion soft, which removes little material and leaves the surface of the part treated in a fairly smooth state.

Claims (12)

Dispositif d'abrasion, comprenant un support (1), réalisé par durcissement d'une matière à viscosité variable (10), et des grains abrasifs (2) inclus dans le support (1), caractérisé en ce que chaque grain abrasif (2) comprend un noyau abrasif (20) enrobé d'un métal ou d'un alliage métallique (21) sensible à une attraction magnétique, et en ce que les grains abrasifs (2) se rassemblent dans des zones (Z1) de concentration en grains abrasifs relativement forte, séparées les unes des autres par des zones (Z0) de concentration en grains abrasifs relativement faible.Abrasion device, comprising a support (1), produced by hardening a material with variable viscosity (10), and abrasive grains (2) included in the support (1), characterized in that each abrasive grain (2 ) comprises an abrasive core (20) coated with a metal or a metal alloy (21) sensitive to a magnetic attraction, and in that the abrasive grains (2) gather in zones (Z1) of grain concentration relatively strong abrasives, separated from each other by zones (Z0) of relatively low abrasive grain concentration. Dispositif d'abrasion suivant la revendication 1, caractérisé en ce que le support (1) comprend une couche superficielle (11) et une couche profonde (12), et en ce que la couche profonde (12) est exempte de grains abrasifs (2).Abrasion device according to Claim 1, characterized in that the support (1) comprises a surface layer (11) and a deep layer (12), and in that the deep layer (12) is free from abrasive grains (2 ). Dispositif d'abrasion suivant la revendication 1 ou 2, caractérisé en ce qu'il comprend des zones (Z0) de concentration relativement faible exemptes de grains abrasifs (2).Abrasion device according to claim 1 or 2, characterized in that it comprises zones (Z0) of relatively low concentration free of abrasive grains (2). Dispositif d'abrasion suivant l'une quelconque des revendications précédentes, caractérisé en ce que les zones (Z1) de concentration relativement forte forment au moins un arrangement (A1, A2, A3) de lignes ou de courbes parallèles les unes aux autres.Abrasion device according to any one of the preceding claims, characterized in that the zones (Z1) of relatively high concentration form at least one arrangement (A1, A2, A3) of lines or curves parallel to each other. Dispositif d'abrasion suivant l'une quelconque des revendications précédentes, caractérisé en ce que la matière à viscosité variable (10) est une résine polymérisable.Abrasion device according to any one of the preceding claims, characterized in that the variable viscosity material (10) is a polymerizable resin. Dispositif d'abrasion suivant la revendication 5, caractérisé en ce que la résine polymérisable est un polyester ou un polyuréthane.Abrasion device according to claim 5, characterized in that the polymerizable resin is a polyester or a polyurethane. Dispositif d'abrasion suivant l'une quelconque des revendications précédentes, caractérisé en ce que les grains abrasifs (2) présentent une plus grande dimension sensiblement perpendiculaire à la couche superficielle (11).Abrasion device according to any one of the preceding claims, characterized in that the abrasive grains (2) have a larger dimension substantially perpendicular to the surface layer (11). Dispositif d'abrasion suivant l'une quelconque des revendications précédentes, caractérisé en ce que les grains abrasifs (2) affleurent à la surface du support (1).Abrasion device according to any one of the preceding claims, characterized in that the abrasive grains (2) are flush with the surface of the support (1). Procédé de fabrication d'un dispositif d'abrasion, comprenant notamment les étapes consistant à : préparer un moule (3) délimité au moins par un fond (30) et un bord (31), le fond (30) formant une surface (300) soumise à un champ magnétique présentant des variations d'intensité et / ou de polarité le long d'au moins une dimension (L) de cette surface (300); saupoudrer, sur le fond (30) du moule, des grains abrasifs (2) dont chacun comprend un noyau abrasif (20) enrobé d'un métal ou d'un alliage métallique (21) sensible à une attraction magnétique; verser dans le moule (3), sur les grains abrasifs (2), une matière durcissable (10) prise dans un état fluide ou mou, ce dont résulte une inclusion des grains abrasifs (2) dans la matière (10); attendre le durcissement de la matière durcissable (10), ce dont résulte, entre les grains abrasifs (2) et la matière (10), une cohésion qui les combine en un même dispositif d'abrasion (4); et démouler le dispositif d'abrasion (4).Method of manufacturing a device abrasion, comprising in particular the stages consisting to: prepare a mold (3) delimited at least by a bottom (30) and an edge (31), the bottom (30) forming a surface (300) subjected to a magnetic field having variations in intensity and / or polarity along at minus one dimension (L) of this surface (300); sprinkle grains on the bottom (30) of the mold abrasives (2) each of which includes an abrasive core (20) coated with metal or metal alloy (21) sensitive to magnetic attraction; pour in the mold (3), on the abrasive grains (2), a material curable (10) taken in a fluid or soft state, this which results in the inclusion of the abrasive grains (2) in the material (10); wait for the material to harden curable (10), which results between the grains abrasives (2) and the material (10), a cohesion which combines in one abrasion device (4); and unmold the abrasion device (4). Procédé de fabrication suivant la revendication 9, caractérisé en ce que les grains abrasifs (2) sont saupoudrés sur le fond (30) en quantité insuffisante pour former une couche unique de grains abrasifs (2) sur tout le fond (30).Manufacturing method according to claim 9, characterized in that the abrasive grains (2) are sprinkled on the bottom (30) in insufficient quantity to form a single layer of abrasive grains (2) on the entire bottom (30). Procédé de fabrication suivant l'une quelconque des revendications 9 et 10, caractérisé en ce qu'il comprend une étape consistant à secouer le moule (3) avant de verser la matière durcissable (10).Manufacturing method according to either of Claims 9 and 10, characterized in that it comprises a step consisting in shaking the mold (3) before pouring the hardenable material (10). Procédé de fabrication suivant l'une quelconque des revendications 9 à 11, caractérisé en ce qu'il consiste à utiliser, en tant que fond (30) de moule, une plaque ou feuille de caoutchouc (301) dans laquelle sont noyés des aimants ou des particules aimantées (302).Manufacturing process according to any one of Claims 9 to 11, characterized in that it consists in using, as the base (30) of the mold, a rubber plate or sheet (301) in which magnets are embedded or magnetic particles (302).
EP02291272A 2001-05-30 2002-05-23 Economical abrading tool and method of manufacture Withdrawn EP1262282A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0107087 2001-05-30
FR0107087A FR2825309B1 (en) 2001-05-30 2001-05-30 ECONOMIC ABRASION DEVICE AND MANUFACTURING METHOD

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN109759966A (en) * 2019-02-22 2019-05-17 华侨大学 A kind of production method of flexible polishing particle magnetism arrangement polishing disk

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110062681A (en) * 2016-12-07 2019-07-26 3M创新有限公司 Flexible abrasive article

Citations (3)

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Publication number Priority date Publication date Assignee Title
FR2281810A1 (en) * 1974-08-15 1976-03-12 Edenvale Eng Works ABRASIVE PRODUCTS
FR2299122A1 (en) * 1974-09-23 1976-08-27 Edenvale Eng Works PROCESS FOR MANUFACTURING ABRASIVE TOOLS AND OBTAINED TOOLS
US5250084A (en) * 1992-07-28 1993-10-05 C Four Pty. Ltd. Abrasive tools and process of manufacture

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2281810A1 (en) * 1974-08-15 1976-03-12 Edenvale Eng Works ABRASIVE PRODUCTS
FR2299122A1 (en) * 1974-09-23 1976-08-27 Edenvale Eng Works PROCESS FOR MANUFACTURING ABRASIVE TOOLS AND OBTAINED TOOLS
US5250084A (en) * 1992-07-28 1993-10-05 C Four Pty. Ltd. Abrasive tools and process of manufacture

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109759966A (en) * 2019-02-22 2019-05-17 华侨大学 A kind of production method of flexible polishing particle magnetism arrangement polishing disk

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FR2825309A1 (en) 2002-12-06

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