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US 9,539,652 B2Granted
Rotary cutting tool having PCD cutting tip
AssigneeKennametal Inc.
InventorsKarthik Sampath, Armin Zimmerman, Steve George
Life of this patent
Estimating the term…
Abstract
A rotary cutting tool comprises an elongate body disposed about a longitudinal axis, the elongate body including a helical flute and a polycrystalline-diamond cutting tip. The cutting tip comprises an inner portion having an inner point angle and an outer portion having an outer point angle different from the inner point angle.
Claims28
A rotary cutting tool comprising:
- an elongate body disposed about a longitudinal axis, the elongate body including a helical flute and a polycrystalline diamond cutting tip having an external radial circumference;
- the cutting tip comprising:
- an inner portion comprising:
- a pair of first cutting edge portions, wherein each first cutting edge portion extends radially away from a central portion of the cutting tip;
- each of the first cutting edge portions being substantially straight along its entire length when viewed in longitudinal cross-section;
- wherein an inner point angle is defined between the first cutting edge portions;
- an outer portion comprising:
- a pair of second cutting edge portions, wherein each second cutting edge portion extends directly from a corresponding first cutting edge portion toward the external radial circumference;
- each of the second cutting edge portions being substantially straight along its entire length when viewed in longitudinal cross-section;
- wherein an outer point angle is defined between the second cutting edge portions, the outer point angle being greater than the inner point angle;
- and an outer margin on the external radial circumference;
- wherein the inner point angle is in the range of about 110 degrees to about 140 degrees;
- and wherein the outer point angle is in the range of more than 150 degrees to less than 180 degrees.
10 more elements
A polycrystalline-diamond cutting tip for use with a rotary cutting tool, the cutting tip comprising:
- a chisel edge having a length about 1% to 10% of an external diameter of the cutting tip;
- an inner portion comprising:
- a pair of first cutting edge portions, wherein each first cutting edge portion extends radially away from a central portion of the cutting tip;
- each of the first cutting edge portions being substantially straight along its entire length when viewed in longitudinal cross-section;
- wherein an inner point angle is defined between the first cutting edge portions;
- and an outer portion comprising:
- a pair of second cutting edge portions, wherein each second cutting edge portion extends directly from a corresponding first cutting edge portion toward the external radial circumference;
- each of the second cutting edge portions being substantially straight along its entire length when viewed in longitudinal cross-section;
- wherein an outer point angle is defined between the second cutting edge portions, the outer point angle being greater than the inner point angle;
- and a top flank which includes a flank edge oriented at an angle ranging from 75 degrees to 105 degrees with respect to the chisel edge;
- wherein the inner point angle is in the range of about 110 degrees to about 140 degrees;
- and wherein the outer point angle is in the range of more than 150 degrees to less than 180 degrees.
9 more elements
A rotary cutting tool comprising:
- an elongate body disposed about a longitudinal axis, the elongate body including a helical flute and a polycrystalline diamond cutting tip;
- the cutting tip comprising:
- a chisel edge having a length about 1% to 10% of an external diameter of the cutting tip;
- an inner portion comprising:
- a pair of first cutting edge portions, wherein each first cutting edge portion extends radially away from a central portion of the cutting tip;
- each of the first cutting edge portions being substantially straight along its entire length when viewed in longitudinal cross-section;
- wherein an inner point angle is defined between the first cutting edge portions;
- and an outer portion comprising:
- a pair of second cutting edge portions, wherein each second cutting edge portion extends directly from a corresponding first cutting edge portion toward the external radial circumference;
- each of the second cutting edge portions being substantially straight along its entire length when viewed in longitudinal cross-section;
- wherein an outer point angle is defined between the second cutting edge portions, the outer point angle being greater than the inner point angle;
- and a top flank which includes a flank edge oriented at an angle ranging from 75 degrees to 105 degrees with respect to the chisel edge;
- wherein the inner point angle is in the range of about 110 degrees to about 140 degrees;
- and wherein the outer point angle is in the range of more than 150 degrees to less than 180 degrees.
11 more elements
Dependencies are inferred from the claim text.