Norton Company

Saint-gobain Abrasives Technology Company

Janet L Hammarstrom

Arno Gardziella

Lee A Carman

William S Coblenz

Michael J Lemberger

Mark W Rowden

Karen M Conley

Bruce E Vigeant

Abrasive grinding wheels having an irregular (i.e., gapped) perimeter shape and/or holes extending therethrough permit one to view the surface of a workpiece being ground in conventional surface finishing, snagging and/or weld blending operations. The grinding wheels may each include one or more gaps disposed in spaced relation about the otherwise circular perimeter of the wheel. Holes also may be provided in addition to, or in lieu of, the gaps, and similarly spaced equidistantly about the wheel. The gaps and/or holes may be configured in many diverse shapes. Gap and hole positions may be selected so as to retain the balance of the wheel. Advantageously, when the wheels are rotated about their axes, one is able to monitor the condition of the surface of the workpiece as it is being abraded, without removing the grinding wheel from the surface.

Abrasive wheels with workpiece vision feature

Abrasive articles and method for preparing them

An improved method for preparing a molding material for abrasive articles has been developed. The method includes the step of continuously blending an abrasive material with a curing agent and measured portions of two phenol-novolac resins, one of which has a phenol-formaldehyde molar ratio in the range of about 1:0.2 to 1:0.35. The blending composition can also include various other materials, such as fillers. The resulting product is a flowable, granular material homogeneously coated with the phenol-novolac resins. The product can be directly molded, i.e., without an aging step, into various abrasive articles, such as grinding wheels. In another embodiment, either a continuous or discontinuous technique can be used to blend the phenol-novolac resins, and the molded product is then cold pressed or warm pressed at a pressing temperature less than about 140.degree. C.

Method for preparing mixtures for abrasive articles

A grinding tool is described which comprises self-bonded particles of a ceramic abrasive and has a voids volume of from 5 to 65%.

Process of producing self-bonded ceramic abrasive wheels

Self-bonded ceramic abrasive wheels

Growing community of inventors

Auburn, MA, United States of America

Janet L Hammarstrom