Method of abrading a workpiece

• US 9,662,766 B2
• Filed: 08/28/2012
• Issued: 05/30/2017
• Est. Priority Date: 09/07/2011
• Status: Active Grant

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Kofler, Josef, Schwabel, Mark G.
• Primary Examiner(s): ROSE, ROBERT A
• Application Number:
  US14/343,237
• Publication Number:
  US 20140287654A1
• Time in Patent Office: 1,736 Days
• Field of Search: 451546, 451541, 451544, 451 28, 51307, 51309, 51298
• CPC Class Codes: B24B 27/0675 methods therefor
• CPC Class Codes: B24D 3/20 and being essentially organic
• CPC Class Codes: B24D 3/344 the bonding agent being organic
• CPC Class Codes: B24D 5/12 Cut-off wheels

Abstract

A method of abrading a workpiece includes: contacting a metallic workpiece, having a bulk temperature of less than 500 degrees Celsius, with a stationary rotating bonded abrasive wheel having a diameter of at least 150 millimeters, wherein the bonded abrasive wheel comprises ceramic shaped abrasive particles retained in a binder, and wherein metallic swarf is formed, and at least 20 percent by weight of the metallic swarf is filamentary metallic swarf having a length of at least 3 mm.

Claims

1. A method of abrading a workpiece, the method comprising:

providing a rotating bonded abrasive wheel attached to a stationary machine tool, the rotating bonded abrasive wheel having a diameter of at least 150 millimeters, wherein the bonded abrasive wheel comprises ceramic shaped abrasive particles retained in a binder, wherein the ceramic shaped abrasive particles comprise alpha alumina, and wherein the ceramic shaped abrasive particles comprise precisely-shaped truncated triangular pyramids; and

contacting the rotating bonded abrasive wheel with a metallic workpiece such that the workpiece is abraded with simultaneous formation of metallic swarf, wherein the metallic workpiece has a bulk temperature of less than 500°

C., and wherein at least 20 percent by weight of the metallic swarf is filamentary metallic swarf having a length of at least 3 millimeters.

2. The method of claim 1, wherein at least 20 percent by weight of the metallic swarf is filamentary metallic swarf having a length of at least 10 millimeters.

3. The method of claim 1, wherein the rotating bonded abrasive wheel further comprises crushed abrasive particles.

4. The method of claim 1, wherein the binder comprises a cured organic binder resin.

5. The method of claim 1, wherein the rotating bonded abrasive wheel has a diameter of at least 350 millimeters.

6. The method of claim 1, wherein the workpiece and rotating bonded abrasive wheel are urged against one another to achieve a cut rate of at least 20 cm²/sec.

7. The method of claim 1, wherein the workpiece and rotating bonded abrasive wheel are urged against one another to achieve a cut rate of at least 40 cm²/sec.

8. The method of claim 1, wherein the workpiece comprises steel.

9. The method of claim 1, wherein the rotating bonded abrasive wheel has a diameter of at least 1000 millimeters.

10. The method of claim 1, wherein the rotating bonded abrasive wheel has a peripheral work surface that rotates at a speed of at least 20 meters/second.

11. The method of claim 1, wherein, for cold cutting conditions, the G-ratio is at least 3.