Diamond or cubic boron nitride grinding wheel with resin core

• US 4,042,346 A
• Filed: 12/24/1975
• Issued: 08/16/1977
• Est. Priority Date: 12/24/1975
• Status: Expired due to Term

• Current Assignee: Norton Company (Compagnie De Saint-Gobain)
• Original Assignee: Norton Company (Compagnie De Saint-Gobain)
• Inventors: Sioui, Richard H., Carver, Edgar B.
• Primary Examiner(s): Arnold, Donald J.
• Application Number:
  US05/644,161
• Time in Patent Office: 601 Days
• Field of Search: 51/293, 51/295, 51/297, 51/298, 51/309
• US Class Current: 51/298
• CPC Class Codes: C08K 3/04 Carbon
• CPC Class Codes: C08K 3/38 Boron-containing compounds
• CPC Class Codes: C08L 2666/14 Macromolecular compounds according to C08L59/00 - C08L87/00; Derivatives thereof
• CPC Class Codes: C08L 2666/54 Inorganic substances
• CPC Class Codes: C08L 61/00 Compositions of condensation polymers of aldehydes or ketones with polyalcohols C08L59/00; with polynitriles C08L77/00; Compositions of derivatives of such polymers
• CPC Class Codes: C08L 63/00 Compositions of epoxy resins; Compositions of derivatives of epoxy resins
• CPC Class Codes: C08L 67/06 Unsaturated polyesters
• CPC Class Codes: C08L 75/04 Polyurethanes
• CPC Class Codes: C08L 79/08 Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors

Abstract

A diamond or cubic boron nitride grinding wheel in which an abrasive section comprising abrasive grits distributed through and held by a phenolic resin matrix is bonded to a non-abrasive core, is improved, in terms of ease of manufacture and elimination of cracking or poor adhesion, by means of a core composition which includes between 5 and 20% by volume of a thermoset resin selected from the group consisting of phenol aldehyde, urea formaldehyde, and melamine formaldehyde resins, particulate metal and graphite, and the remainder being a resin selected from the group consisting of epoxy resins, addition polymers of unsaturated polyesters, and thermosetting polyimide resins, in the range of from 5 to 80% by volume of the core.

Claims

1. In a grinding wheel comprising a grinding section including an abrasive selected from the group consisting of diamond and cubic boron nitride, said grinding section being bonded to the outer periphery of a non-abrasive core, the improvement comprising the core having a composition consisting essentially of from 5 to 20% by volume of a resin selected from the group consisting of phenol aldehyde, urea aldehyde, and melamine aldehyde resins, from 0 to 90% by volume of fillers selected from the group consisting of aluminum powder, copper powder, and graphite, and from 5 to 80% by volume of cured reaction products of resin molding powders selected from the group consisting of epoxy resins, unsaturated polyester resins, urethane resins, and thermosetting polyimide resins.

2. A cup type grinding wheel as in claim 1.

3. A cup type grinding wheel as in claim 1 in which the grinding section lies in a recess extending radially and axially of a cup shaped core.