EP1442842B1 - Abrasive disc for grinding machine - Google Patents

Description

The use of abrasive discs to work on metallic materials, non-metallic, concretes, reinforced concrete, tiles, tiles, is very common. The discs can receive carbide inserts or diamond segments increasing their hardness, said discs being disposed both at the disc periphery and laterally, in regular or irregular positions.

The discs are in practice made in the form of flat crowns. They come to fit on grinding machines to be driven in the most appropriate manner by motor axis in a known manner. Very often, a protective cover is placed around the grinding wheel, leaving free the cutting and abrasion zone.

It has thus been shown to Figures 1 and 2 the prior art. According to figure 1 , the abrasion disc is flat (1) and there is shown by way of example carbide (2) abrasion plates, the protective housing being represented by (3). In practice, it is found that the abrasion effect is only partially performed on the platelet or platelets considered, and there is therefore a partial wear. Furthermore, the clearance zone (d) of the disk relative to the housing is very limited and does not allow complete use of the disk.

In addition, the conditions of use of these abrasive discs are limiting in terms of applications, and it is not possible, for example, to treat complex shapes or angled shapes.

There appears to be on the market a configuration of the abrasive disc having a folded structure as shown figure 2 . In this case, the disc (4) has from a central base (4a) necessary for attachment to the machine, a radial extension defining a folded area with an intermediate portion (4b) rising and a end portion (4c) oriented differently and arranged angularly with respect to the previous one. It is this latter part which receives the carbide insert or plates (2) or diamond segments of all types, is of a length substantially equal to that of the length of the previous zone. The last part (4c) receives carbide inserts of all types. A guard (3) protects the disc except of course from the working area.

In this folding configuration, wear of the carbide inserts or diamond segments only partially occurs. In this implementation, the disk configuration limits the conditions of use. The manufacture of this type of disc remains delicate and expensive.

Abrasive devices described in US Patents 6280309 and JP 2000 144 244 , which do not allow an optimization of the movement of the tool. The US Patent 6,280,309 B describes a disk according to the preamble of claim 1.

The Applicant's approach has therefore been to take an interest in this prior art and to look for a new design of abrasive discs allowing a better control and regularity of wear of the carbide tips or diamond segments, but also to seek an extension of applications, by optimizing the shape and improving the conditions of use.

Another goal sought was to reduce the cost of making the discs.

These and other goals will be apparent from the rest of the description.

According to a first feature, the abrasive disk is defined in claim 1.

These and other characteristics will be apparent from the rest of the description.

• Les figures 1 et 2 sont des vues de côté et à caractère schématique des disques d'abrasion selon l'art antérieur.
• La figure 3 est une vue de profil et en coupe d'un disque d'abrasion selon l'invention.
• La figure 4 est une vue en plan du disque selon la figure 3.
• La figure 5 est une vue en perspective du disque d'abrasion selon l'invention, les plaquettes carbure ou segments diamantés n'étant pas représentées.
• La figure 6 est une vue du disque selon l'invention monté sur une machine à meuler.

For fixing the object of the invention illustrated in a nonlimiting manner to the figures of the drawings where:

• The Figures 1 and 2 are schematic side views of the abrasion discs according to the prior art.
• The figure 3 is a profile view in section of an abrasion disc according to the invention.
• The figure 4 is a plan view of the disc according to the figure 3 .
• The figure 5 is a perspective view of the abrasion disc according to the invention, the carbide inserts or diamond segments not being shown.
• The figure 6 is a view of the disk according to the invention mounted on a grinding machine.

In order to make the object of the invention more concrete, it is now described in a nonlimiting manner illustrated in the figures of the drawings.
The abrasive disk according to the invention is referenced as a whole by (10). It has a flat portion (10a) central and median with a cutout (10b) for support and attachment to a grinding machine (11).

According to the invention and with a view to performance optimization, the disk comprises beyond said central portion a curvilinear shape (10c), continuous, smooth, with a first zone (Z1) adjacent to the central part, then a second zone (Z2) constituting the end edge of the disk receiving the carbide plate or plates (2), of all shapes and dimensions, arranged regularly or not on the face (10d) curvilinear and curved apparent disc. The plates are thus disposed on said second zone (Z2), but also alternatively or in a complementary manner, they are arranged on the edge (10e) of the disk.

In the context of the embodiment optimization of the disk according to the invention, the zones (Z1-Z2) which define the curvilinear configuration of the disk have different radii (R1-R2) in order to give and to create a claw effect. to said form.

More particularly, the outer radius (R1) of the zone (Z1) may be of the order of 18 to 20 millimeters from a virtual axis (A1) lying substantially beyond and behind the horizontal plane of the part plate (10a). This radius may preferably be of the order of 19 millimeters for an outer diameter of the disc of the order of 115 millimeters.

Zone (Z2) has a radius (R2) of the order of 48 to 52 millimeters, preferably 50 millimeters, for the diameter of the disc of the order of 115 millimeters. In relation to the radius (R2), the axis (A2) is located at this distance in the extension of the axis (A1) and with respect to the horizontal tangent of the highest point of the zone (Z2) relative to the zone (Z1).

Thus the configuration obtained optimizes the conditions of use of the abrasive disk. Indeed, the use of the grinding machine equipped with an abrasion disc according to the invention can be performed with a natural movement in the manner of a claw to allow much more rational use of the tool with more regular wear.

Furthermore, the carbide inserts or diamond segments are profiled curvilinear, if they are arranged radially on the zone (Z2), so that there is no more angle of attack, or risk of rapid deterioration of said pads .

The abrasive discs according to the invention are obtained by stamping, so that their manufacturing cost is reduced and in any case much more economical than the discs manufactured according to the prior art.

The abrasion disc according to the invention also makes it possible to undergo a surface treatment if necessary.

In practice, the disk according to the invention in its particular configuration makes it possible to carry out more precise, more extensive work with a more natural manual guidance with respect to the receiving structure. They also make it possible to cut more irregular, curvilinear forms, in ripple and in practice, allow interventions on building site of more numerous and more varied buildings.

Claims (3)

1. An abrasive disk for grinders of the type having a central flat flange with an opening for fixing it to the grinder and having carbide inserts or diamond segments on its curved peripheral area or laterally on its peripheral edge, of the type comprising areas Z1 and Z2 having different successive radii R1 and R2 and in which the shape of the disk beyond said central flange (10a) has a continuous, smooth, curved configuration (10c) with a first area (Z1) adjacent to the central flange having a first radius (R1) and extending as a second area (Z2) having a second radius (R2), said second area constituting the extreme edge part of the disk which accommodates the carbide insert or inserts or diamond segment or segments and in which the radii have different dimensional ratios, the configuration of said areas making it possible to define a guide path by a continuous, gradual, ample movement in the manner of a claw in order to enable efficient, comprehensive and uniform use of all the abrasive inserts or diamond segments and in that the external radius (R1) of area (Z1) is established relative to virtual axis (A1) located beyond and behind the horizontal plane of said flat part (10a),
   and in that area (Z2) has a radius (R2) which is established relative to virtual axis (A2) located as an extension of axis (A1) and relative to the tangent line which is horizontal to the uppermost point of area (Z2) relative to area (Z1),
   and in that radius (R1) of area (Z1) is of the order of 18 to 20 mm,
   and in that radius R2 is of the order of 48 to 52 mm.
2. A disk as claimed in claim 1, characterised in that radius (R1) is 19 mm for a disk having an outside diameter of 115 mm.
3. A disk as claimed in claim 1, characterised in that radius (R2) is of the order of 48 to 52 mm for a disk having an outside diameter of 115 mm.

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