Magnetic cores for diamond or cubic boron nitride grinding wheels

• US 4,184,854 A
• Filed: 04/24/1978
• Issued: 01/22/1980
• Est. Priority Date: 04/24/1978
• Status: Expired due to Term

• Current Assignee: Norton Company (Compagnie De Saint-Gobain)
• Original Assignee: Norton Company (Compagnie De Saint-Gobain)
• Inventors: Carver, Edgar B., Sioui, Richard H.
• Primary Examiner(s): Arnold, Donald J.
• Application Number:
  US05/899,519
• Time in Patent Office: 638 Days
• Field of Search: 51/298, 51/295, 51/309
• US Class Current: 51/298
• CPC Class Codes: B24D 5/16 Bushings; Mountings
• CPC Class Codes: B24D 7/16 Bushings; Mountings
• CPC Class Codes: C09K 3/14 Anti-slip materials; Abrasives products specifically intended for the fabrication of abrasive tools, blocks or papers, or for operations of the kind of sand-blasting and barrelling B24B31/14, B24C1/00; polishing compositions containing abrasive or grinding agents C09G1/02; polishing of semi-conductors H01L; friction compositions for brakes or clutches F16D69/02

Abstract

Iron or other magnetic metal powder is incorporated with aluminum in the core of a diamond or boron nitride grinding wheel. In addition to providing such characteristics as satisfactory bonding ability, strength, thermal expansion, thermal conductivity and turning characteristics, such cores are better held on a magnetic chuck for the performance of finishing operations.

Claims

1. A grinding wheel comprising a grinding annulus containing diamond or cubic boron nitride abrasive particles in a bonding matrix said annulus supported on a central hub comprising hot pressed aluminum powder, characterized in that the aluminum hub includes from 5 to 25% by volume of a bonding aid selected from the group consisting of resin, tin and zinc and from 20 to 40% by volume of a magnetic metal powder.

2. A grinding wheel as in claim 1 in which the bonding aid is a resin, corresponding to the composition of the bonding mix in the grinding annulus.

3. A grinding wheel as in claim 1 in which the bonding matrix is a polymer of an imide oligomer containing unsaturated terminal groups.

4. A grinding wheel as in claim 3 in which the grinding section is metal bonded and the core bonding aid is selected from the group consisting tin and zinc.