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US 10,850,333 B2Granted
Drill
AssigneeTungaloy Corporation
InventorTakao Katagiri
Life of this patent
Estimating the term…
Abstract
A drill including: a chip discharge groove formed in an outer periphery of an edge portion serving as a leading end side portion of a drill body; and a cutting edge formed in an intersecting edge between a rake surface of a leading end side region and a leading end flank of the edge portion. The drill having a margin portion, a shoulder portion and a web thinning portion. The cutting edge includes, in order from a rotation center, first cutting edge, second cutting edge, shoulder cutting edge, and margin cutting edge portions. Honing widths of the second cutting edge, the margin cutting edge, and the shoulder cutting edge portions satisfy a relation represented by expression (1), as follows: honing width of the shoulder cutting edge portion>honing width of the margin cutting edge portion≥honing width of the second cutting edge portion.
Claims17
A drill in which:
- a chip discharge groove which extends toward a base end is formed in an outer periphery of an edge portion serving as a leading end side portion of a drill body rotated around an axis;
- and a cutting edge is formed in an intersecting edge between a rake surface of a leading end side region of an inner wall surface of the chip discharge groove and a leading end flank of the edge portion, such inner wall surface facing forward with respect to a drill rotating direction, the drill comprising:
- a margin portion intersecting with the rake surface and facing toward the outer periphery;
- a shoulder portion being an intersecting edge between the margin portion and the leading end flank of the edge portion and extending, from an outer peripheral end of the cutting edge, backward with respect to the drill rotating direction;
- and
- a web thinning portion extending toward a leading end of the inner wall surface of the chip discharge groove, wherein:
- the cutting edge comprises, in order from a rotation center, a first cutting edge portion formed in the web thinning portion, a second cutting edge portion formed closer to the outer periphery than the first cutting edge portion, a shoulder cutting edge portion formed in the shoulder portion, and a margin cutting edge portion formed in the margin portion;
- honing is performed on the second cutting edge portion, the margin cutting edge portion and the shoulder cutting edge portion;
- and
- honing widths of the respective portions satisfy a relation represented by the expression:
- the honing width of the shoulder cutting edge portion>the honing width of the margin cutting edge portion≥the honing width of the second cutting edge portion.
8 more elements
A coated drill having a coated layer formed on a surface thereof, in which:
- a chip discharge groove which extends toward a base end is formed in an outer periphery of an edge portion serving as a leading end side portion of a drill body rotated around an axis;
- and a cutting edge is formed in an intersecting edge between a rake surface of a leading end side region of an inner wall surface of the chip discharge groove and a leading end flank of the edge portion, such inner wall surface facing forward with respect to a drill rotating direction, the coated drill comprising:
- a margin portion intersecting with the rake surface and facing toward the outer periphery;
- a shoulder portion being an intersecting edge between the margin portion and the leading end flank of the edge portion and extending, from an outer peripheral end of the cutting edge, backward with respect to the drill rotating direction;
- and
- a web thinning portion extending toward a leading end of the inner wall surface of the chip discharge groove, wherein:
- the cutting edge comprises, in order from a rotation center, a first cutting edge portion formed in the web thinning portion, a second cutting edge portion formed closer to the outer periphery than the first cutting edge portion, a shoulder cutting edge portion formed in the shoulder portion, and a margin cutting edge portion formed in the margin portion;
- honing is performed on the second cutting edge portion, the margin cutting edge portion and the shoulder cutting edge portion;
- and
- honing widths of the respective portions satisfy a relation represented by the expression:
- the honing width of the shoulder cutting edge portion>the honing width of the margin cutting edge portion≥the honing width of the second cutting edge portion.
8 more elements
A drill in which:
- a chip discharge groove which extends toward a base end is formed in an outer periphery of an edge portion serving as a leading end side portion of a drill body rotated around an axis;
- and a cutting edge is formed in an intersecting edge between a rake surface of a leading end side region of an inner wall surface of the chip discharge groove and a leading end flank of the edge portion, such inner wall surface facing forward with respect to a drill rotating direction, the drill comprising:
- a margin portion intersecting with the rake surface and facing toward the outer periphery;
- a shoulder portion being an intersecting edge between the margin portion and the leading end flank of the edge portion and extending, from an outer peripheral end of the cutting edge, backward with respect to the drill rotating direction;
- and
- a web thinning portion extending toward a leading end of the inner wall surface of the chip discharge groove, wherein:
- the cutting edge comprises, in order from a rotation center, a first cutting edge portion formed in the web thinning portion, a second cutting edge portion formed closer to the outer periphery than the first cutting edge portion, a shoulder cutting edge portion formed in the shoulder portion, and a margin cutting edge portion formed in the margin portion;
- honing is performed on the second cutting edge portion, the margin cutting edge portion and the shoulder cutting edge portion;
- and
- honing widths of the respective portions satisfy a relation represented by the expression:
- the honing width of the shoulder cutting edge portion>the honing width of the margin cutting edge portion>the honing width of the second cutting edge portion.
8 more elements
Dependencies are inferred from the claim text.