Silver-coated abrasives, tools containing silver-coated abrasives, and applications of these tools

• US 6,666,753 B2
• Filed: 02/02/2001
• Issued: 12/23/2003
• Est. Priority Date: 02/02/2001
• Status: Expired due to Term

• Current Assignee: Diamond Innovations Incorporated (Sandvik AB), GE Superabrasives Inc. (Sandvik AB)
• Original Assignee: General Electric Company
• Inventors: McHale, James M. Jr., Riehle, Daniel R., Jacobuss, Markus, Von Dungen, Juergen, Dailey, James H.
• Primary Examiner(s): Hail, III, Joseph J.
• Assistant Examiner(s): OJINI, EZIAMARA ANTHONY
• Application Number:
  US09/776,141
• Publication Number:
  US 20020164931A1
• Time in Patent Office: 1,054 Days
• Field of Search: 451/36, 451/48, 451/41, 451/304, 451/307, 451/28, 512/95, 513/07, 513/09, 513/04, 428/172, 428/469, 428/552, 428/697-699, 752/36, 752/38, 752/42, 419/11, 419/15, 419/18, 419/26, 419/30, 419/32, 419/34, 419/53
• US Class Current: 451/48
• CPC Class Codes: B24D 3/00 Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
• CPC Class Codes: Y10T 428/24612 Composite web or sheet

Abstract

Flute grinding cemented carbide workpieces with a diamond containing resin bond grinding wheel is improved by restricting the diamond to comprise a silver-coated diamond; conducting the grinding in the presence of a lubricant consisting of only straight oil; and conducting the grinding at a wheel speed of less than about 30 m/s and preferably about 20 m/s. The preferred diamond is coated with about 25% and 75% silver by weight.

Claims

1. In a method for grinding cemented carbide workpieces with a resin bond grinding wheel comprising silver-coated diamond, said method comprising the steps:

(a) conducting said grinding in the presence of a lubricant consisting essentially of a straight oil; and

(b) conducting said grinding at a wheel speed of less than about 30 m/s.

2. The method of claim 1, wherein said diamond contains between about 25% and 75% silver coating by weight.

3. The method of claim 2, wherein said diamond contains about 50% silver coating by weight.

4. The method of claim 1, wherein said straight oil comprises a mineral oil.

5. The method of claim 1, wherein said wheel speeds are about 20 m/s.

6. The method of claim 1, wherein said resin bond grinding wheel is formed from one or more of a phenol-formaldehyde reaction product, a melamine or urea formaldehyde resin, an epoxy resin, a polyester, a polyamide, or a polyimide.

7. The method of claim 6, wherein said resin bond grinding wheel is one or more of a phenol-formaldehyde reaction product or a polyimide.

8. The method of claim 1, wherein said cemented carbide workpiece includes one or more of a Group IVB, VB, or VIB metal, which is pressed and sintered in the presence of a binder of one or more of cobalt, nickel, iron, or alloys thereof.

9. The method of claim 8, wherein said cemented carbide workpiece comprises WC.

10. The method of claim 9, wherein said WC workpiece is cemented with Co.

11. The method of claim 1, wherein said grinding is flute grinding.

12. The method of claim 1, wherein said grinding is creep feed grinding.

13. In a method for grinding cemented carbide workpieces with a resin bond grinding wheel comprising silver-coated diamond, said method comprising the steps:

(a) conducting said grinding in the presence of a lubricant consisting essentially of a mineral oil; and

(b) conducting said grinding at a wheel speed of less than about 30 m/s;

wherein said silver-coated diamond is coated with between about 25% and 75% silver by weight.

14. The method of claim 13, wherein said wheel speed is about 20 m/s.

15. The method of claim 13, wherein said resin bond grinding wheel is formed from one or more of a phenol-formaldehyde reaction product, a melamine or urea formaldehyde resin, an epoxy resin, a polyester, a polyamide, or a polyimide.

16. The method of claim 15, wherein said resin bond grinding wheel is one or more of a phenol-formaldehyde reaction product or a polyimide.

17. The method of claim 13, wherein said cemented carbide workpiece includes one or more of a Group IVB, VB, or VIB metal, which is pressed and sintered in the presence of a binder of one or more of cobalt, nickel, iron, or alloys thereof.

18. The method of claim 17, wherein said cemented carbide workpiece comprises WC.

19. The method of claim 18, wherein said WC workpiece is cemented with Co.