DE2601788A1 - Grinding wheel with diamond or boron nitride grinding inserts - has array of pyramidal grinding inserts with underlying sintered metal support disc - Google Patents

Abstract

The grinding wheel has diamond or boron nitride grinding inserts joined to it by a metallic bonding layer. The wheel has a metallic centre disc, coated in an annular edge band with the grinding layer. The surface of the grinding disc (1) has a regular array of pyramidal cutting projections, with intersecting grooves (9) or similar depressions which may extend through into the underlying intermediate layer. The depth of the intersecting grooves (9) is roughly the same as that of the sintered metallic intermediate layer to which the grinding layer (8) is attached. The grooves prevent overheating of the wheel, and help to dissipate heat better.

Description

Grinding wheel or the like

The invention relates to a grinding wheel or the like.

which is a sintered metal bond made of diamond or made of. Boron nitride compound an or the like. Existing grinding body and at least one metallic base body having, wherein the thickness of the sintered abrasive coating is greater than the thickness of the diamond grain used.

Such grinding wheels are already known. You will be particular used for heavy use. However, these grinding wheels still have the The disadvantage is that a comparatively smooth sanding surface forms when worn, so that thereby an undesirable warming of the grinding wheel to an increased extent The result is. In addition, the abrasive effect is also largely dependent on the degree of wear depending on the grinding layer.

The object of the invention is therefore to provide a grinding wheel of the initially mentioned create the type mentioned, which on the one hand can withstand high loads, on the other hand but also has an approximately constant grinding effect.

To solve this problem, the invention proposes that the Surface of the grinding wheel a profiling in the form of preferably intersecting Grooves or the like.

Has depressions and that the depth of the grooves is approximately the thickness of the abrasive coating containing the abrasive bodies.

We already know similar grinding wheels that have a profile exhibit. This consists of milled or knurled grooves so that island-shaped grinding surfaces form. This training creates a build-up of heat although largely avoided, however, the load capacity in special applications may not be sufficient, especially since the grooves in their Extend depth also into the base body, which is thereby weakened.

In contrast, in the case of the grinding wheel according to the invention, the im the main body, which determines the overall stability, through the entire profile intact, as the grooves are only located within the sintered layer.

In the grinding wheel according to the invention, the grooves become the same when the sintered layer is sintered onto the metallic base body, so that the production is also comparatively simple. It also results from this despite the profiling, a particularly stable, comparatively heavy-duty coating.

A particularly advantageous development of the invention provides that between the base body and the abrasive coating an abrasive body-free, preferably sintered intermediate layer is provided. This enables an approximately optimal utilization the abrasive layer, because in this case the grooves slightly in the intermediate layer can reach into it and thus the layer containing the abrasive articles completely can be exploited, taking advantage of the profiling throughout Service life of the grinding wheel can come into play. The hardness of the grinding wheel all in all is not adversely affected thereby in an advantageous manner.

The invention also relates to a method for producing the initially mentioned grinding wheel according to the invention.

In particular, it is proposed that when the abrasive coating is opened internally or the like. a surface structuring on the metallic base body at the same time in the form of grooves or the like. is imprinted.

Such a sintered profiling has a high degree of strength. In addition, an inexpensive production can thereby be achieved, in particular also because, for example, the subsequent Profiling can be omitted.

It is particularly advantageous if the grinding bodies and the layer having the profiling and the intermediate layer free from abrasive media be sintered onto the base body at the same time.

The intermediate layer and the grinding layer thus form a uniform, particularly stable sintered layer. After the abrasive layer has worn off, the Sintered layer free of abrasive particles for wear, so that the base body is also unaffected, in particular remains unaffected in its strength.

Additional refinements of the invention are set out in the further subclaims listed.

The following is the invention in its essential details explained in more detail with reference to the drawing.

It shows: FIG. 1 a grinding wheel according to the invention in plan view, FIG. 2 shows a view of a grinding wheel along the section line II - II in FIG. 1, Fig. 3 partial sectional views and partial elevations with up to 12 differently profiled, grinding wheels according to the invention.

A grinding wheel 1 shown in FIGS. 1 and 2 has a disk-shaped one Base body 2, here on one side in an outer ring area with an abrasive coating 4 is provided. A hole 5 is provided for fastening the grinding wheel 1.

FIG. 3 shows the internal structure in the ring area 3 of the grinding wheel 1. Between the base body 2 and the abrasive layer 4 there is an abrasive body-free sintered intermediate layer 6 can be seen. Both these and the abrasive coating are sintered onto the metallic base body 2. Only those according to the invention with one Grooved profiling 7 provided grinding layer 4 contains grinding body 8, which can consist of diamonds or a boron nitride compound. Essential is that between the S: hicht 4 containing the abrasive bodies 8 and the intermediate layer 6 there is no actual separation.

Rather, they jointly form a sintered layer in the outer area Abrasive bodies 8 are stored up to a certain depth. This results in high strength.

The depth of the grooves 9 corresponds to the exemplary embodiments shown about the grinding layer 4. If necessary, however, this profiling 7 can also be used reach somewhat into the intermediate layer 6. It can thereby be achieved that the abrasive layer 4 can be fully utilized, with the grooves during the total service life of the grinding wheel 1, in particular for a comparatively ensure low heating of the grinding wheel 1.

When sintering on the abrasive coating and any provided Intermediate layer 6 on metallic base body 2 is the surface structuring at the same time in the form of grooves 9 or the like. For this purpose, the sintering mold expediently ridges corresponding to the grooves. A subsequent introduction of a profile, as with known grinding wheels, is therefore not necessary. In addition to the essential Labor saving can also result in a significantly higher strength.

FIG. 4 shows a section of an abrasive coating in which Cross grooves 9 at an angle of 90 degrees. The grooves 9 have a trapezoidal cross-section. In contrast, the section A has a V-shaped cross-section provided for the grooves 9, the walls of which 1o converge to a point and form an isosceles triangle in cross section (see also Fig. 3).

y FIGS. 5 and 6 show a further possible profile 7.

The grooves 9 have a U-shaped cross section.

The profiling in FIGS. 9 and 10 also has a similar one Cross-section, vJ the bottom of the grooves 9 is rounded.

In the embodiment according to Figures 7 and 8 are similar as in Figure 4 grooves 9 are provided with a trapezoidal cross-section, the individual raised areas have a trapezoidal cross-section.

The profiling shown in Figures 11 and 12 has intersecting Grooves 9, these being at an angle smaller than 90 degrees, in this Cross the embodiment at an angle of about 7o degrees. The cross sections the grooves 9 are once V-shaped (FIG. 11) and in the other embodiment (Fig. 12) formed trapezoidal.

The aforementioned possible profiling 7 is a good adaptation possible for various applications.

overall, the grinding wheel 1 according to the invention combines the advantages the sintered metal bond of the grinding body 8 with the distortions of a profile by having both high strength and comparatively low heating the grinding wheel t can be achieved.

in particular, it can also be used with these highly stressable grinding wheels an approximately constant grinding effect can be achieved through the profiling. Clogging of the abrasive coating is avoided.

All in = the Resehreibwag, the following claims and the drawing Features can be essential both individually and in any combination with one another Have meaning.

- Expectations -

Claims (10)

Claims 1. grinding wheel or the like. the one sintered metal bond the diamond or a boron nitride compound od. The like. Existing abrasive body and having at least one metallic base body, the thickness of the sintered Abrasive coating is greater than the thickness of the diamond grain used or the like., d u r c h e k e nn n z e i c h n e t that the surface of the grinding wheel (1) a profile (7) in the form of preferably intersecting grooves (9) od. Like. Depressions, and that the depth of the grooves (9) is approximately the thickness of the corresponds to the abrasive coating (4) containing the abrasive bodies (8). 2. Grinding wheel according to claim 1, characterized in that between the base body (2) and the abrasive coating (4) are preferably free of abrasive bodies sintered intermediate layer (6) is provided. 3. Grinding wheel according to claim 1 or 2, characterized in that that the grooves (9) are at an angle of 9o degrees and cross that its cross-section tapers towards the base body (2), preferably V-shaped or trapezoidal. 4. Grinding wheel according to one or more of claims 1 to 3, characterized in that the walls (Io) of the V-shaped grooves (9) are pointed converge and that the groove cross-section is an isosceles triangle. 5. Grinding wheel according to one or more of claims 1 to 4, characterized characterized in that mutually parallel, adjacent, in cross-section V-shaped grooves have a distance from one another which is greater than the largest Width of a groove (9) is. 6. Grinding wheel according to one or more of claims 1 to 5, characterized in that the grooves (9) are U-shaped, preferably at their bottom have a rounded cross-section. 7. Grinding wheel according to one or more of claims 1, 2 or 4 to 4 edkuernmzeich that the grooves (9) at an angle smaller than Cross 9o degrees, preferably at a pure angle of about 70 degrees and that the raised Areas (11) between the grooves (9) are diamond-shaped. 8. Grinding wheel according to claim 7, characterized in that crossing at an angle less than 9o degrees. Grooves (9) have a V-shaped cross-section have and that the raised areas (11) preferably taper to a point. 9. A method for producing a grinding wheel or the like. which is a sintered metal bond of the diamond or boron nitride compound from an od. The like. Existing grinding body and at least one metallic base body having, wherein the thickness of the sintered abrasive coating is greater than the thickness of the diamond grain used, in particular according to one or more of the claims 1 to 8, that is, that when the abrasive coating is sintered on (4) or the like. At the same time a surface structuring on the metallic base body (2) in the form of grooves (9) or the like. Is embossed. 10. The method according to claim 9, characterized in that the Abrasive body (8) and the profiling (7) having layer and the abrasive body-free Intermediate layer (6) are simultaneously sintered onto the base body (2).