Superabrasive tool
View Patent ↗A tool for use in an abrasive machining process has a body extending along a central longitudinal axis from a first end to a tip end. An abrasive material is located on the tip end. A central recess is formed in the tip end.
1. A tool for use in an abrasive machining process comprising:
a body extending along a central longitudinal axis from a first end to a tip end and having:
an externally threaded portion for engaging a machine;
a flange having a pair of flats for receiving a wrench;
a shaft extending tipward from the flange; and
a tip end protuberance extending radially beyond an intermediate portion of the shaft;
an abrasive material coated on the tip end protuberance, including along a longitudinally convex portion; and
a central recess in the tip end wherein the longitudinally convex portion extends tipward from a longitudinally concave transition that extends from an intermediate portion, and wherein the concave transition is also coated with the abrasive material.
2. The tool of claim 1 further comprising a plurality of additional recesses extending from the central recess.
3. The tool of claim 2 wherein the additional recesses are elongate recesses and extend generally toward the first end.
4. The tool of claim 3 wherein the elongate recesses are each have a recess length and are partially circumferentially oriented and partially longitudinally oriented along a major portion of said recess length.
5. The tool of claim 3 wherein the plurality of elongate recesses are identical and evenly circumferentially-spaced.
6. The tool of claim 2 wherein the plurality of additional recesses consists of 2-4 recesses.
7. The tool of claim 1 wherein:
the tip end protuberance is toroidal.
8. The tool of claim 1 wherein the abrasive is selected from the group consisting of plated cubic boron nitride, vitrified cubic boron nitride, diamond, silicon carbide, and aluminum oxide.
9. The tool of claim 1 in combination with a machine rotating the tool about the longitudinal axis at a speed in excess of 10,000 revolutions per minute.
10. The tool of claim 1 wherein the longitudinally convex portion extends through an outboardmost location of the tip end and radially inward to form a rim.
11. The tool of claim 1 wherein the longitudinally convex portion forms a rim.
12. The tool of claim 1 wherein the body further comprises a proximal portion between the flange and the intermediate portion, the proximal portion having a diameter greater than a diameter of the intermediate portion.
13. The tool of claim 12 wherein the proximal portion has a length greater than a combined length of the intermediate portion and the tip end protuberance.
14. The tool of claim 1 wherein the body has:
a threaded portion; and
an unthreaded cylindrical portion between the threaded portion and the flange.
15. The tool of claim 3 wherein the recesses extend along the intermediate portion.
16. The tool of claim 1 wherein:
a diameter of the protuberance is 8-20 mm; and
a length of the body from bath surface of the flange to the tip end is 40-80 mm.
17. The combination of claim 9 wherein:
a diameter of the protuberance is 8-20 mm; and
a length of the body from bath surface of the flange to the tip end is 40-80 mm.
18. The tool of claim 10 wherein:
a diameter of the protuberance is 8-20 mm; and
a length of the body from bath surface of the flange to the tip end is 40-80 mm.
19. The tool of claim 1 wherein:
the abrasive material has a grit size in the range of 40/45 to 225/400.
20. A tool for use in an abrasive machining process comprising:
a body extending along a central longitudinal axis from a first end to a tip end;
an abrasive material coated on the tip end, including along a longitudinally convex portion; and
a central recess in the tip end, wherein:
the longitudinally convex portion extends radially outward, through an outboardmost location of the tip end, and radially inward to form a rim;
the body has a proximal portion; and
the body has an intermediate portion between the tip end and the proximal portion, the intermediate portion having a diameter smaller than a diameter of the proximal portion and the longitudinally convex portion wherein the longitudinally convex portion extends tipward from a longitudinally concave transition that extends from the intermediate portion, and wherein the concave transition is also coated with the abrasive material.
21. A tool for use in an abrasive machining process comprising:
a body extending along a central longitudinal axis from a first end to a tip end;
an abrasive material coated on the tip end, including along a longitudinally convex portion; and
a central recess in the tip end, wherein:
the longitudinally convex portion forms a rim of a tip protuberance;
the body has a proximal portion; and
the body has an intermediate portion between the proximal portion and the tip protuberance and having a smaller diameter than the proximal portion and the tip protuberance wherein the longitudinally convex portion extends tipward from a longitudinally concave transition that extends from the intermediate portion, and wherein the concave transition is also coated with the abrasive material.
22. A tool for use in an abrasive machining process comprising:
a body extending along a central longitudinal axis from a first end to a tip end;
an abrasive material coated on the tip end, including along a longitudinally convex portion; and
a central recess in the tip end,
wherein the longitudinally convex portion extends tipward from a longitudinally concave transition from an intermediate portion, the abrasive material being coated along the transition.