Gapless chipbreaker
AssigneeKyocera Sgs Precision Tools, Inc.
InventorsDouglas P. BONFIGLIO, Paul S. DANIELS
Life of this patent
Estimating the term…
Abstract
Chip breaking features may be arranged in radial reliefs of a rotary cutting tool. The chip breaking features create gaps or voids in the otherwise continuous cutting edge, resulting in otherwise continuous chips being cut into discrete chips. The chip breaking features may be angled so as to define a secondary cutting edge. Depending on the angle at which the chip breaking features are angled, the secondary cutting edges may partially or completely close the gaps or voids in the cutting edge. Closing the gaps or voids in the cutting edge ensures that each blade removes nearly all material so the following blade does not have to clean up.
Claims24
A chip breaker geometry for a cutting tool, wherein the cutting tool includes a cutting portion that extends along a tool axis to an axial end, a plurality of blades extending along a length of the cutting portion and radially outward from the tool axis, and a cutting edge formed on each of the blades at an intersection between a leading face of the blade and a radial relief surface of the blade, the chip breaking geometry comprising:
- a plurality of notches formed into the radial relief surfaces at an angle relative to the tool axis, wherein the angle is sufficient to define a secondary cutting edge in each of the notches.
A cutting tool, comprising:
- a tool body oriented along an axis;
- at least two blades extending radially outward from a longitudinal axis along at least a portion of the tool body, the at least two blades include a first blade and a second blade that rotates into a position formerly occupied by the first blade upon rotation of the tool body about the longitudinal axis, wherein each blade includes a cutting edge formed at an intersection between a leading face of the blade and a radial relief surface of the blade,
- at least one first chip breaker arranged on the first blade to define at least one first gap in the first cutting edge and at least one second chip breaker arranged on the second blade to define at least one second gap in the second cutting edge, wherein the at least one second gap includes a secondary cutting edge that overlaps at least a portion of the at least one first gap defined by the first chip breaker when the second blade rotates into the position formerly occupied by the first blade.
An uninterrupted cutting edge for a rotary cutting tool, the rotary cutting tool having a body oriented along an axis, at least two blades extending along a cutting length of the body, radially outward from the axis, and a cutting edge formed on each of the blades at an intersection between a leading face of the blade and a radial relief surface of the blade, the uninterrupted cutting edge comprising:
- at least one first notch arranged at an intersection between a leading face of the first blade and a radial relief surface of the first blade;
- and
- at least one second notch arranged at an intersection between a leading face of the second blade and a radial relief surface of the second blade, wherein the at least one second notch at least partially overlaps the first notch upon rotation of the rotary cutting tool.
Dependencies are inferred from the claim text.