The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 18, 1985
Filed:
Aug. 06, 1984
William H Williston, Holden, MA (US);
Norton Company, Worcester, MA (US);
Abstract
A composite grinding wheel comprising a support center with a peripheral groove containing a ring of metal bonded abrasive bonded thereto is made by placing in the bottom of an annular mold cavity, a ring whose internal bore is larger than and spaced from the inner smaller diameter of the mold cavity. The mold cavity above the ring is then filled with a sufficient volume of a mixture of metal bond and abrasive particles and closed off by an annular support center supported by the mold and having a central hub portion of smaller diameter than the internal bore in the ring and an axial height extending upwardly to an upper outer flange extending radially over the top of the mold cavity. The support center and ring are pressed together thereby compacting the mixture of metal bond and abrasive particles together between the upper outer flange and ring until the central hub extends into the ring and is substantially aligned with the bottom of the mold cavity and side of the ring. The cold pressed assembly is then heated sufficiently to sinter the metal bond, the abrasive particles, the support center, and ring, together into a unitary composite grinding wheel which is then stripped from the mold and, if necessary, machined to the desired size and shape.