Cutting insert having chip breaker
AssigneeTungaloy Corporation
InventorShinya Majima
Life of this patent
Estimating the term…
Abstract
A cutting insert has an approximately polygonal plate shape with a cutting edge formed on a intersection portion between a rake face and a flank. A chip breaker is formed on the rake face, and a chip-breaker concave portion is defined by an inclined surface which is curved in a concave manner and which is smoothly connected to the bottom surface portion while being gradually inclined toward the bottom surface portion, from a peripheral edge portion on a nose portion side to a bottom surface portion.
Claims18
A cutting insert formed of a plate-like member with a substantially polygonal outer shape and comprising:
- a rake face with a chip breaker which is formed on at least one of top and bottom surfaces;
- a flank formed on an outer peripheral surface extending between the top and bottom surfaces;
- and
- a cutting edge formed on an intersection portion between the rake face and flank, the cutting edge comprising:
- an arc-shaped cutting edge being curved in an arc shape and located on at least one nose portion of the cutting insert,
- a working cutting edge extending from one side of the arc-shaped cutting edge, and
- a linear cutting edge extending from the other side of the arc-shaped cutting edge, wherein
- a chip-breaker concave portion is formed in the vicinity of the arc-shaped cutting edge on the rake face;
- a breaker projection stands from a bottom surface portion of the chip-breaker concave portion;
- and
- the chip-breaker concave portion is defined by an inclined surface which is curved in a concave manner and which is smoothly connected to the bottom surface portion while being gradually inclined toward the bottom surface portion, from a peripheral nose edge portion on the nose portion side to the bottom surface portion.
A cutting insert formed of a plate-like member with a substantially polygonal outer shape and comprising:
- opposing top and bottom surfaces and an outer peripheral surface extending between the top and bottom surfaces;
- a flank formed on the outer peripheral surface;
- a rake face formed on at least the top surface;
- a cutting edge formed at an intersection of the rake face and flank, the cutting edge comprising:
- an arc-shaped cutting edge located on at least one nose portion of the cutting insert,
- a working cutting edge extending from a first side of the arc-shaped cutting, edge along the top surface, and
- a linear cutting edge extending from an opposite, second side of the arc-shaped cutting edge, along the top surface, and
- a chip breaker formed on the rake surface and comprising:
- a chip-breaker concave portion formed in the vicinity of the arc-shaped cutting edge on the rake face, the chip-breaker concave portion comprising a concavely curved inclined surface extending from a peripheral nose edge portion to a bottom surface portion of the chip-breaker concave portion which is located away from the nose portion;
- a breaker projection standing from the bottom surface portion of the chip-breaker concave portion at a location away from the nose portion;
- and
- a chip breaker groove formed on either side of the chip-breaker concave portion, adjacent to the breaker projection.
Dependencies are inferred from the claim text.