FR2616369A1 - DIAMOND DISK FOR CUTTING HARD OR ABRASIVE PRODUCTS - Google Patents

Abstract

The present invention relates to a diamond disc for cutting hard or abrasive products, such as stones, granites, sandstones, refractory products, concrete or similar products, disc made up of a sheet support whose periphery comprises teeth separated by notches, as well as diamond segments of precise shape matching the curvature of the periphery of the support and whose thickness is greater than that of the support plate. This disc is characterized in that the leading edge of each tooth 2 is provided with a means of protection 5 against abrasion.

Description

"Diamond blade for cutting hard or abrasive products" This

  The invention relates to a diamond disc for cutting hard or abrasive products, such as stones, granites, sandstones, refractory products, concrete or similar products, a disc made of a sheet metal support whose periphery comprises

  teeth separated by notches, as well as segments

  diamond-shaped shapes that conform to the curvature of

  the periphery of the support and whose thickness is greater than

  than that of the support plate.

  Diamond sawing discs are known for

  cut hard or abrasive products of the type indicated

  above. Such a known disk is shown in FIG. 1, which shows part of the sheet metal support 1 provided with teeth 2 separated by notches 3. Each tooth is covered with teeth

a diamond segment 4.

  The plate of the support 1 of the segments 4 is made of

  quality steel, tensioned and glide.

  Diamond segments are pellets having a

  precise shape matching the curvature of the edge of the teeth.

  These segments have a rigorous thickness and the length

  different segments are identical.

  The segments have, for example, a length of 40 mm. As shown in FIG. 2, the segments 4 have a thickness greater than the thickness of the support plate

Z616369

  1 so as to give way to sawdust

  in the product. It also allows the arrival of

  cutting tool (usually water or emulsified water) centrifugally used to cool the cutting area and to remove debris

sawing.

  It should be noted that for technical reasons

  construction and use, the records of

  cutting always turn in the same direction.

  The notches 3 of the support i delimit not only

  the length of the teeth and the length of the segments

  diamonds but also create upstream of each segment

  a small reserve volume for sawing sludge.

  The diamond segments 4 are fixed on the teeth 2 by appropriate connecting means, for example welds. However, it has been found on the known cutting discs, an erosion effect at the base of the segments, that is to say at the junction of the segments and teeth of the support in

  sheet. This erosion results in a thinning

  the outer edge of the teeth (FIGS. 3, 3A)

  thus letting the connecting surface between the segment

  4 and the corresponding tooth 2. The initial form

  the teeth is shown in dashed lines in FIG. 3A and the shape in knife blade, solid line. This

  wear is caused by the erosion of the sludge

  place in front of the sheet at a relative speed sometimes reaching 40 m per second. Due to the thinning of

  outer edge of the teeth, the disc may lose the

  well before they are worn out. In addition, the wear of the edges of the teeth in the form of a knife blade no longer makes it possible to envisage fixing on the disks of

new diamond segments.

  This means that the entire diamond disc must be discarded prematurely. However, such a disc especially when it is a large disk is an expensive product both by the cost

  of the support and by that of the diamond segments.

  The object of the present invention is to remedy these drawbacks and concerns, for this purpose, a diamond disk of the above type, characterized in that the edge

  of each tooth 2 is provided with means for pro-

Tection 5 against abrasion.

  Thanks to the means of protection of the leading edge of each tooth against abrasion, the teeth are no longer

  eroded as a knife blade, which prevents the seg-

  The diamond segments do not detach prematurely from each tooth and, moreover, when the diamond segments are worn, it allows to reload the support with new diamond segments. This prolongs the duration of use of the support and decreases, consequently, the

cost of the entire tool.

  According to a particularly interesting characteristic, the means of protection against erosion and abrasion is constituted by an erosion-resistant wafer, a wafer which covers the leading edge of

each tooth.

  According to another characteristic, each plate

  protection is only provided on one side of the

  that of each tooth, the side on which the

  wafer alternating from one tooth to the next tooth.

  This feature is particularly interesting, it reduces the dimensions of the protective plates and the cost of setting them. Moreover, as platelets do not

  are not all on the same side of the support but

  from one tooth to another, the flow of abrasive mud

  then walk in a zigzag from one notch to another.

  According to another characteristic of the invention,

  the means of protection against abrasion and platelets

  The protection against abrasion is made of materials selected from the following group: - sintered tungsten carbide, - fused tungsten carbide, - boron carbide, - titanium carbide, - ceramic,

- porcelain.

  According to another characteristic of the invention, the plates are fixed on at least a part of the leading edge of each tooth, by welding, brazing,

  gluing, laser welding.

  In general, the thickness of the wafers is chosen according to the life expectancy of them and which can correspond to that of the diamond segments. The present invention will be described in more detail with the aid of the accompanying drawings, in which: FIG. 1 is a front view of a portion of a disk, this section according to the prior art, FIG. 2 is a sectional view. 1 and 3A, respectively, are a perspective view and a cross-sectional view showing the knife edge wear of a tooth carrying a diamond segment,

  FIG. 4 is a perspective view of the

  peripheral portion of a diamond disk carrier according to the invention, - Figure 5 is a top view of the support of

Figure 4.

  According to FIGS. 4 and 5, the diamond disk of the invention consists of a support 1 made of sheet metal whose

  periphery has teeth 2 separated by

  3. The teeth 2 have diamond elements 4.

  The direction of rotation of the disc is indicated by the

  arrow A. The diamond disc has means of pro-

  5. These means are preferably

  on the leading edge of each tooth (depending on the direction of rotation of the disc, meaning

always the same).

  According to a preferred embodiment, the protection means 5 are constituted, each time, by a plate occupying the entire leading edge of

  each tooth 2 or preferably only one side of each

  that tooth; the sides on which its planned

  5 forming the protection means, alternate from one tooth to the other as shown in Figure 5. These pads against abrasion are in abrasion-resistant materials including tungsten carbide, sintered or melted, boron carbide, titanium carbide, ceramic or porcelain. These plates are fixed on the leading edge of each tooth by a fixing means such that

  welding, soldering, gluing, micro-welding

laser fusion, etc.

  FIG. 5, which is a top view of the edge of a diamond disc, shows several teeth 2A, 2B, 2C, 2D of the disc, the diamond platelets 4A, 4B, 4C, 4D in dotted lines, the pellets 5B, 5C, 5D. lining the leading edge of the corresponding teeth and occupying

  alternating positions sometimes on the left, sometimes on the right.

  This figure also shows by an arrow the meaning of

displacement of the teeth.

  Although the above description concerns the use

  With only one plate per leading edge, the leading edge of each tooth can be loaded with several plates depending on the surface to be protected. These pads

  can also have different thicknesses.

Claims (4)

CLAIMS V E N D I C A T IO N S   1 ') Diamond disc for cutting hard or abrasive products, such as stones, granites, sandstones, refractories, concrete or similar products, disc made of a sheet metal support whose periphery comprises separate teeth by notches,   as well as precisely shaped diamond segments   the curvature of the periphery of the support and the thickness of which is greater than that of the support plate, characterized in that the leading edge of each tooth (2) is provided with a protection means (5) against abrasion.   2 ') diamond disc according to claim 1,   characterized in that the protection means (5) against abrasion is constituted by an erosion-resistant wafer.   3 ') Diamond disc according to any one of the   claims 1 and 2, characterized in that each   protective cover (5) is provided only on one side of the leading edge of each tooth (2), the side on which is provided the wafer alternating from one tooth to the next tooth.   4 ') Diamond disc according to any one of the   Claims 1 to 3, characterized in that the protection means (5) against abrasion and platelets   protection against abrasion, is in selected materials   in the following group: - sintered tungsten carbide, - fused tungsten carbide, - boron carbide, - titanium carbide, - ceramic, - porcelain.   Diamond disc according to Claim 2, characterized in that the plates are fastened to at least a portion of the leading edge of each tooth by soldering, brazing, bonding, laser-welding.