Grinding Disc And Method For Production Thereof

Abstract

A grinding disc, comprising a particularly metal grinding disc base body and abrasive grains applied to a surface of the grinding disc base body, in particular, made from cubic boron nitride is disclosed. The abrasive grains are arranged on the surface of the grinding disc base body with a defined position and defined separation to each other. A greater number of abrasive grains are arranged in given macro regions (18) of the surface of the grinding disc base body than in other given macro regions (19) of the surface.

Description

The present invention relates to a grinding disk according to the definition of the species in Patent Claim 1. Furthermore, the present invention relates to a method for manufacturing a grinding disk.

During grinding with a rotating tool, a rotating grinding disk is moved relative to a stationary or also moving workpiece in order to produce an intended contour on the surface of the workpiece by way of machining. It is already known from the related art to use abrasive grains made of cubic boron nitride on metallic grinding disks. Abrasive grains made of cubic boron nitride are also referred to as CBN abrasive grains. According to the related art, the CBN abrasive grains applied to a grinding disk base body are statistically distributed and thus undefined. Such grinding disks having an undefined arrangement of the abrasive grains on the grinding disk base body have an inadequate service life and must therefore be frequently replaced, which ultimately results in high equipment costs. This is a disadvantage overall.

The object of the present invention is to create a novel grinding disk and a method for manufacturing such a grinding disk.

This object is achieved by a grinding disk as recited in Patent Claim 1. According to the present invention, the abrasive grains are applied to the surface of the grinding disk base body in a defined position and with a defined spacing to one another.

In the context of the present invention, a grinding disk is proposed in which the abrasive grains are applied to the surface of the grinding disk base body in a defined distribution, i.e., in a defined position and with defined spacing to one another. The defined distribution of the abrasive grains on the grinding disk base body allows an improved supply of coolant onto the surface area of the grinding disk, which is in grinding contact, as well as an improved removal of the chips which form during grinding. Another advantage is the fact that by using a grinding disk designed according to the present invention, the service life of the grinding disk may be prolonged, thereby reducing tool costs.

According to an advantageous refinement of the present invention, the abrasive grains are applied to the surface of the grinding disk base body in such a way that for each area of the grinding disk surface, which is in effective grinding contact, the number of abrasive grains is approximately constant at a constant width of that area.

According to another advantageous refinement of the present invention, a greater number of the abrasive grains are positioned in predetermined macro-areas of the surface of the grinding disk base body than in other predetermined macro-areas of the surface, the position and/or the spacing and/or the number of abrasive grains on the surface of the grinding disk base body being adjusted to the workpiece contour to be produced by grinding.

The method according to the present invention for manufacturing a grinding disk is defined in Patent Claim 6.

Preferred refinements of the present invention arise from the subclaims and the following description. Exemplary embodiments of the present invention are explained in greater detail based on the drawing, without being limited thereto.

FIG. 1 shows a cross section of a grinding disk section together with a workpiece to be machined by grinding;

FIG. 2 shows a schematic top view onto the surface of a grinding disk according to the present invention;

FIG. 3 shows a schematic top view onto the surface of another grinding disk according to the present invention, and

FIG. 4 shows a schematic top view onto the surface of another grinding disk according to the present invention.

FIG. 1 shows a highly schematic section of a grinding disk 10 together with a workpiece 11 to be machined by grinding. As is apparent in FIG. 1, grinding disk 10 is rotatorily driven during grinding in the direction of arrow 12 and moved relative to workpiece 11 in the direction of arrow 13. The movement in the direction of arrow 13 is referred to as a feed movement. Furthermore, as is apparent in FIG. 1, a section or area 16 of surface 17 of grinding disk 10, delimited by points 14 and 15, is in effective grinding contact with workpiece 11. Since, on the one hand, grinding disk 10 is rotatorily driven in the direction of arrow 12 and is, on the other hand, moved relative to workpiece 11 in the feed movement direction shown by arrow 13, area 16 of surface 17 of grinding disk 10, which is in effective grinding contact with workpiece 11, changes continuously.

Grinding disk 10 has a preferably metallic grinding disk base body and abrasive grains applied to the surface of the grinding disk base body. The abrasive grains are preferably made of cubic boron nitride. In the context of the present invention it is proposed to apply the abrasive grains to the surface of the grinding disk base body in a defined distribution, i.e., in a defined position and with defined spacing to one another. The abrasive grains are applied to the surface of the grinding disk base body in such a way that for each area 16 of grinding disk surface 17, which is in effective grinding contact, the number of abrasive grains is approximately constant at a constant width of that area. A greater number of the abrasive grains are preferably positioned in predetermined macro-areas of the surface of the grinding disk base body than in other predetermined macro-areas of the surface. It is possible that macro-areas with abrasive grains and macro-areas without abrasive grains join one another alternatingly.

FIG. 2 shows a possible arrangement of the abrasive grains on the surface of the grinding disk base body, for example. In the exemplary embodiment of FIG. 2, macro-areas 18 with abrasive grains and macro-areas 19 without abrasive grains are formed on the surface of the grinding disk base body. Macro-areas 18 and 19 run diagonally over surface 17 of the grinding disk base body, one macro-area 19 without abrasive grains running between two adjacent macro-areas 18. In macro-areas 18, the abrasive grains are positioned on the surface of the grinding disk base body evenly distributed, i.e., in an even number and evenly spaced. There are no abrasive grains whatsoever in macro-areas 19.

FIG. 3 shows an alternative arrangement of the abrasive grains on the surface of the grinding disk base body. Also in the exemplary embodiment of FIG. 3, macro-areas 20 with abrasive grains and macro-areas 21 without abrasive grains are formed. Macro-areas 20 with abrasive grains run crosswise diagonally over the surface of the grinding disk base body and enclose rectangular or rhombic macro-areas 21 without abrasive grains. The abrasive grains are again positioned evenly distributed in macro-areas 20, i.e., in an even number and evenly spaced.

FIG. 4 shows another possible arrangement of abrasive grains on the surface of the grinding disk base body. In the exemplary embodiment of FIG. 4, first macro-areas 22 with abrasive grains run ring segment-shaped on the surface of the grinding disk base body, one macro-area 23 without abrasive grains being enclosed between two adjacent macro-areas 22 with abrasive grains, and macro-areas 23 without abrasive grains being also ring segment-shaped. In addition to first macro-areas 22 with abrasive grains, a second macro-area 24 extends over the surface of the grinding disk base body, second macro-area 24 intersecting macro-areas 22 and 23. A greater number of abrasive grains are positioned in macro-area 24 opposite macro-areas 22.

The immediate consequence of the possible arrangements of the abrasive grains on the grinding disk base body, described as examples with reference to FIGS. 2 through 4, is that in terms of the present invention macro-areas are defined which differ in the number of abrasive grains positioned in the macro-areas. In the exemplary embodiments of FIGS. 2 through 4, there are no abrasive grains whatsoever in macro-areas 19, 21, and 23, these macro-areas being used for supplying a coolant and for the removal of chips which form during grinding. In contrast, macro-areas 18, 20, 22, and 24 have abrasive grains. As FIG. 4 shows in particular, a greater number of abrasive grains may be provided in macro-areas 24 than in macro-areas 22.

The concrete arrangement of the abrasive grains on the surface of the grinding disk base body in terms of the present invention takes place preferably in such a way that the distribution of the abrasive grains corresponds to the contour to be produced in the workpiece to be machined using the grinding disk. The position as well as the spacing and the number of abrasive grains on the surface of the grinding disk base body is then adjusted to the workpiece contour to be produced by grinding.

Moreover, in terms of the present invention, a method for manufacturing a grinding disk according to the present invention is proposed. The method according to the present invention includes at least the following steps: a) providing a grinding disk base body preferably made of metal; b) providing abrasive grains preferably made of cubic boron nitride; c) applying the abrasive grains to the surface of the grinding disk base body in a defined position and with defined spacing to one another.

In the context of the present invention, the procedure in detail is that the metallic grinding disk base body and possibly the abrasive grains preferably made of cubic boron nitride are nickel-plated prior to application of the abrasive grains to the grinding disk base body. The nickel-plated grinding disk base body is heated in some areas or partially on the surface preferably using partial laser irradiation and the abrasive grains are applied to these heated macro-areas of the surface. In this way, the abrasive grains adhere to the heated macro-areas on the surface of the grinding disk base body. This means that the abrasive grains made of cubic boron nitride adhere to the surface of the grinding disk base body in the predetermined macro-areas. Subsequent to the adhesion of the abrasive grains in these predetermined macro-areas of the surface of the grinding disk base body, chemical or galvanic nickel-plating takes place. Therefore, in the context of the present invention it is proposed to apply the abrasive grains exclusively in selected macro-areas or sections on the surface of the grinding disk base body.

In a modification of the above-described preferred specific embodiment of the manufacturing method according to the present invention for a grinding disk it is also conceivable to apply the abrasive disks conventionally to the entire surface of the grinding disk base body and subsequently work out the macro-areas without abrasive grains or with a smaller number of abrasive grains via laser machining.

Claims

1-12. (canceled)

13. A method for manufacturing a grinding disk comprising:

providing a grinding disk base body having a surface;

providing abrasive grains;

applying the abrasive grains to the surface of the grinding disk base body in a defined position and with defined spacing to one another, at least one of the grinding disk base body and the abrasive grains being nickel-plated, the abrasive grains adhering to heated macro-areas of the surface of the grinding disk base body due to partial heating of the surface of the grinding disk base body and the application of the abrasive grains to the heated macro-areas of the surface; and

subsequent to the adhesion of the abrasive grains to the heated macro-areas of the surface of the grinding disk base body, providing a chemical or galvanic nickel-plating.

14. The method as recited in claim 13 wherein the grinding disk base body is made of metal.

15. The method as recited in claim 13 wherein the abrasive grains are made of cubic boron nitride.

16. The method as recited in claim 13 wherein the surface of the grinding disk base body is heated exclusively in the macro-areas, and that the abrasive grains are applied exclusively to the heated macro-areas of the surface of the grinding disk base body.

17. The method as recited in claim 13 wherein the heating is carried out via partial laser irradiation of the surface of the grinding disk base body.

18. The method as recited in claim 13 wherein the abrasive grains are applied to an entirety of the surface of the grinding disk base body and further comprising subsequently removing the abrasive grains from the macro-areas.

19. The method as recited in claim 18 wherein the removal of the abrasive grains from the predetermined macro-areas is carried out via partial laser irradiation of the surface of the grinding disk base body.