Abrasive rotary tool with abrasive agglomerates

Patent metadata

Field	Value
Publication number	US-11040429-B2
Application number	US-201615758371-A
Country	US
Kind code	B2
Filing date	Sep 6, 2016
Priority date	Sep 8, 2015
Publication date	Jun 22, 2021
Grant date	Jun 22, 2021

Abstract

An abrasive rotary tool includes a tool shank defining an axis of rotation for the rotary tool, and an abrasive external working surface. The abrasive external working surface includes a resin, and a plurality of porous ceramic abrasive composites dispersed in the resin, the porous ceramic abrasive composites including individual abrasive particles dispersed in a porous ceramic matrix. At least a portion of the porous ceramic matrix comprises glassy ceramic material. A ratio of the average porous ceramic abrasive composite size to the average individual abrasive particle size is no greater than 15 to 1.

First claim

What is claimed is:

1. An abrasive rotary tool comprising:
a tool shank defining an axis of rotation for the rotary tool; and
an abrasive external working surface coupled to the tool shank, wherein the abrasive external working surface comprises:
a resin; and
a plurality of porous ceramic abrasive composites dispersed in the resin, the porous ceramic abrasive composites comprising individual abrasive particles dispersed in a porous ceramic matrix, material, wherein at least a portion of the porous ceramic matrix comprises glassy ceramic wherein a ratio of the average porous ceramic abrasive composite size to the average individual abrasive particle size is no greater than 15 to 1;
wherein the porous ceramic abrasive composites represent between 35 percent to 65 percent by weight of the working surface, based on the total weight of the resin and the porous ceramic abrasive composites.

2. The abrasive rotary tool of claim 1 , wherein the resin includes an epoxy resin.

3. The abrasive rotary tool of claim 1 , wherein the resin includes one or more of a group consisting of:
a polyester resin;
a polyvinyl butyral (PVB) resin;
an acrylic resin;
thermal plastic resin;
a thermally curable resin;
an ultraviolet light curable resin; and electromagnetic radiation curable resin.

4. The abrasive rotary tool of claim 1 , wherein the individual abrasive particles comprise diamond.

5. The abrasive rotary tool of claim 1 , wherein the individual abrasive particles include one or more from a group consisting of:
cubic boron nitride; fused aluminum oxide; ceramic aluminum oxide;
heated treated aluminum oxide; silicon carbide; boron carbide; alumina zirconia; iron oxide; ceria; and garnet.

6. The abrasive rotary tool of claim 1 , wherein the porous ceramic abrasive composites have an average particle size of less than 65 microns and a max particle size of less than 500 microns.

7. The abrasive rotary tool of claim 1 , wherein the porous ceramic matrix comprises a glass including one or more from a group consisting of: aluminum oxide; boron oxide; silicon oxide; magnesium oxide; sodium oxide; manganese oxide; and zinc oxide.

8. The abrasive rotary tool of claim 1 , further comprising metal particles dispersed in the resin.

9. The abrasive rotary tool of claim 1 , wherein the abrasive external working surface is a molded surface.

10. The abrasive rotary tool of claim 1 , wherein the abrasive external working surface forms an arrangement of precisely shaped abrasive agglomerates, each precisely shaped abrasive agglomerate being tapered with diminishing width toward its distal end.

11. The abrasive rotary tool of claim 1 , further comprising a flexible planar section positioned opposite the tool shank relative to the cylindrical section,
wherein the flexible planar section forms the abrasive external working surface on a first side of the flexible planar section facing generally away from the tool shank,
wherein the flexible planar section facilitates abrading, with the abrasive external working surface, a corner of the workpiece across multiple angles relative to the axis of rotation for the rotary tool through bending of the flexible planar section when the abrasive external working surface is applied to the corner of the workpiece.

12. The abrasive rotary tool of claim 11 ,
wherein the abrasive external working surface is a first abrasive external working surface, the abrasive rotary tool further comprising a second abrasive external working surface on a second side of the flexible planar section, the second side of the flexible planar section facing in the general direction of the tool shank,
wherein the corner is a first corner of the workpiece adjacent a first side of the workpiece, and
wherein the flexible planar section facilitates abrading, with the second abrasive external working surface, a second corner adjacent to a second side of the workpiece, the second side of the workpiece opposing the first side of the workpiece, across multiple angles relative to the axis of rotation for the rotary tool through bending of the flexible planar section when the second abrasive working external surface is applied to the second corner of the workpiece.

13. The abrasive rotary tool of claim 1 , wherein the abrasive external working surface includes an abrasive cylindrical surface.

14. The abrasive rotary tool of claim 1 , wherein the abrasive external working surface surrounds the axis of rotation for the rotary tool, the abrasive external working surface providing one or more circular cross sections perpendicular to the axis of rotation such that tool shape corresponds to a desired finished shape of an edge of the workpiece.

15. The abrasive rotary tool of claim 14 , wherein the abrasive external working surface is a first abrasive external working surface, the abrasive rotary tool further comprising a second abrasive external working surface forming an angled surface relative to the axis of rotation for the rotary tool to facilitate abrading interior or exterior beveled edges of the workpiece.

16. The abrasive rotary tool of claim 1 , wherein the abrasive external surface forms a planar surface perpendicular with the axis of rotation for the rotary tool.

17. The abrasive rotary tool of claim 1 , wherein the abrasive external working surface forms an angled surface relative to the axis of rotation for the rotary tool to facilitate abrading interior or exterior beveled edges of the workpiece.

18. A method of finishing an edge of a partially-finished cover glass for an electronic device, the method comprising:
continuously the rotating abrasive rotary tool of claim 1 ;
contacting the edge with the abrasive external surface of the continuously rotating abrasive rotary tool to abrade the edge.

19. The abrasive rotary tool of claim 1 , further comprising an abrasive article, the abrasive article comprising the abrasive external working surface and a base layer coupled to the abrasive external working surface, wherein the base layer comprises a polyurethane, a polystyrene, a polybutadiene, or a styrene and butadiene block copolymer.

20. An abrasive rotary tool comprising:
a tool shank defining an axis of rotation for the rotary tool; and
an abrasive external working surface coupled to the tool shank, wherein the abrasive external working surface comprises:
a resin; and
a plurality of porous ceramic abrasive composites dispersed in the resin, the porous ceramic abrasive composites comprising individual abrasive particles dispersed in a porous ceramic matrix, material, wherein at least a portion of the porous ceramic matrix comprises glassy ceramic wherein a ratio of the average porous ceramic abrasive composite size to the average individual abrasive particle size is no greater than 15 to 1;
wherein the abrasive external working surface forms an arrangement of precisely shaped abrasive agglomerates, each precisely shaped abrasive agglomerate being tapered with diminishing width toward its distal end.

Assignees

• 3M Innovative Properties Co

Inventors

• Sventek Bruce A
• Baird David G
• Painter Adam J
• Engfer Tammy J
• Stapleton Dennis J
• Gagliardi John J

Classifications

• B24D13/142

  Wheels of special form · CPC title

• B24D3/18 Primary

  for porous or cellular structure · CPC title

• B24D13/12

  comprising assemblies of felted or spongy material, e.g. felt, steel wool, foamed latex · CPC title

• B24B5/48

  for grinding walls of very fine holes, e.g. in drawing-dies · CPC title

• B24D11/02

  Backings, e.g. foils, webs, mesh fabrics · CPC title