Dressing wheel and method of making same

ABSTRACT

A dressing wheel has a disk-shaped base body centered on an axis and formed with an annular groove also centered on the axis and having an inner surface. A multiplicity of abrasive elements distributed along the groove are in direct contact with the groove inner surface. Matrix powder fills the groove between the elements and between the elements and the groove surfaces. A hardened infiltrating agent, e.g. solder, fills interstices of the matrix powder.

INFORMATION

DETAILED DESCRIPTION OF THE INVENTION

SPECIFIC DESCRIPTION

As seen in FIG. 1 a dressing wheel is mainly formed by an annular steel base body or disk centered on an axis A. It is formed in an outside corner as shown in FIGS. 2 through 4 with a rectangular-section groove open at an axial face of the disk and having an inside surface . In accordance with the invention this groove is first fitted with an array of abrasive elements that are spaced angularly about the axis A. Some of these elements , which are real or synthetic diamonds, are oriented parallel to the axis A, some perpendicular thereto, and some at an acute angle to it. The abrasive elements do not fill the groove but are at least partially in direct contact with the surface . An adhesive layer holds the elements in place.

As shown in FIG. 2 the groove is filled around the elements with a mass of a matrix powder that may include particles of hard solder. The mass is packed in place by vibration, centrifuging, or the like. More hard solder pieces are placed on the powder mass at the mouth of the groove as shown in FIG. . Abrasive particles, e.g. of carbide, can be incorporated in the matrix powder and/or in the solder to render the resultant matrix more durable and abrasive. Then the assembly is heated so that the solder melts and flows by capillary action into the interstices between the particles of the mass . This heating can vaporize the adhesive layer since, once the mass is packed in place, the elements will remain in position so that the adhesive is no longer needed. After the mass is fully infiltrated with the molten solder, the workpiece is cooled to harden the solder and powder together into a matrix bonded to the elements and to the groove surface .

Subsequently as shown in FIG. 3 a frustoconical back face of the disk is machined away and then the front face as shown in FIG. 4, shaping the mass and elements into the configuration necessary for use of the wheel in truing.

FIG. 5 shows how elements can be distributed along a surface of the groove . Then as shown in FIGS. 6 and 7 the back and front of the wheel are milled off. The shape of the surface against which the elements lie corresponds to the finished shape of the corner of the wheel so that these elements are all perfectly exposed once the final machining step is complete.

BRIEF DESCRIPTION OF THE DRAWING

The above and other objects, features, and advantages will become more readily apparent from the following description, reference being made to the accompanying drawing in which:

FIG. 1 is an axial section through a dressing wheel according to the invention;

FIGS. 2, , and are large-scale views corresponding to the detail indicated at Z in FIG. 1 of the wheel at different stages of its manufacture; and

FIGS. 5, , and are views like FIGS. 2-4 showing another wheel according to the invention in different stages of manufacture.

CLAIMS

1. A method of making a dressing wheel, the method comprising the steps of sequentially: positioning abrasive elements along an annular groove opening at a face of a base body; securing the abrasive elements in the annular groove; filling the annular groove between the abrasive elements and between the abrasive elements and surfaces of the annular groove with a matrix powder; infiltrating interstices of the matrix powder with a liquid infiltrating agent; hardening the infiltrating agent and thereby bonding the matrix powder to the abrasive elements and to the annular groove surfaces; and machining off an outer surface of the bonded together matrix powder, hardened infiltrating agent, and abrasive elements.

2. The method defined in claim 1 wherein the outer surface is machined off to impart a predetermined body-of-revolution shape to the disk at the annular groove.

3. The method defined in claim 1 wherein the matrix powder includes solder particles.

4. The method defined in claim 1 wherein the infiltrating agent is solder.

5. The method defined in claim 1 wherein the infiltrating agent is an unactivated copper-base solder.

6. The method defined in claim 1 wherein the matrix powder includes particles of carbide, nitride, oxide, or ceramic.

7. The method defined in claim 1 wherein the infiltrating agent includes particles of carbide, nitride, oxide, or ceramic.

8. The method defined in claim 1 wherein the base body is centered on an axis and at least some of the abrasive elements are secured in the annular groove with an adhesive.

9. The method defined in claim 1 wherein the base body is centered on an axis and at least some of the abrasive elements are secured in the annular groove in a position extending generally perpendicular to the axis.

10. The method defined in claim 1 wherein the base body is centered on an axis and at least some of the abrasive elements are secured in the annular groove in a position extending generally parallel to the axis.

11. The method defined in claim 1 wherein the base body is centered on an axis and at least some of the abrasive elements are secured in the annular groove in a position extending at acute angles to the axis.

12. The method defined in claim 1, further comprising the step of packing the matrix powder in the annular groove around the abrasive elements before hardening the infiltrating agent.

13. A dressing wheel comprising: a disk-shaped base body centered on an axis and formed with an annular groove also centered on the axis and having an inner surface; a multiplicity of abrasive elements distributed along the annular groove and in direct contact with the annular groove inner surface; matrix powder in the annular groove between the abrasive elements and between the abrasive elements and the annular groove surface; and a hardened infiltrating agent filling interstices of the matrix powder.

14. The dressing wheel defined in claim 13 wherein the infiltrating agent is an unactivated copper-base solder.

15. The dressing wheel defined in claim 13 wherein the matrix powder includes particles of carbide, nitride, oxide, or ceramic.

16. The dressing wheel defined in claim 13 wherein the infiltrating agent includes particles of carbide, nitride, oxide, or ceramic.

17. The dressing wheel defined in claim 13 wherein at least some of the abrasive elements extend perpendicular to the axis.

18. The dressing wheel defined in claim 13 wherein at least some of the abrasive elements extend parallel to the axis.

19. The dressing wheel defined in claim 13 wherein at least some of the particles extend at acute angles to the axis.

20. The dressing wheel defined in claim 13 wherein the abrasive elements are diamond particles.

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