Stone working – Sawing – Rotary
Patent
1996-11-21
1999-02-09
Rose, Robert A.
Stone working
Sawing
Rotary
451547, 451542, 76112, 175379, B28D 104
Patent
active
058681256
ABSTRACT:
An abrasive tool for cutting extremely abrasive-resistant materials includes a novel, abrasive segment with a generally crenelated, rectangular appearance. The segment has a single piece vein of a primary abrasive and first bond material extending completely along the length of the segment. The vein transverses the width of the segment at least once in a non-linear path and alternately coincides with inner and outer faces. Gaps between the vein and the faces opposite the vein coincident faces are occupied by a second bond material, and optionally, a secondary abrasive, thus forming multiple, separated abrasive regions. The bottom surface of the segment is attached to a core at an operative perimeter which defines the cutting edge of the tool. The segment can be adapted to conform to the curvature of diverse cutting edges, and thus can be used in rotary and reciprocating saw blades and core drilling bits. The crenelated construction of the abrasive segment provides a fast cutting, durable tool incorporating less of costly superabrasives, such as diamond, than comparable tools. Despite an intricate configuration of primary and secondary abrasives within the segment, the novel tool has enhanced structural integrity.
A method of making the novel abrasive tool is provided in which primary abrasive and first bond material are compacted to shape a vein preform which is presintered in a vein mold to produce a green vein. The green vein is placed in a segment mold and then second bond material and optional secondary abrasive are, deposited in cavities between the vein and segment faces to create separated abrasive regions. The segment is sintered to cure the bond material permitting the segment to be attached to the operative perimeter of the tool core as a unit. The method of making the abrasive tool is fast which contributes to low fabrication costs.
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PCT International Search Report, PCT/US/97/17581, filed 30 Sep. 1997.
Nguyen George
Norton Company
Porter Mary E.
Rose Robert A.
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