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US 10,131,003 B2Granted
Cemented carbide corner radius end mill with continuously curved rake ridge and helical flute design
AssigneeIscar, Ltd.
InventorLeonid Shpigelman
Life of this patent
Estimating the term…
Abstract
A corner radius end mill includes a tooth adjacent a helically extending flute. The tooth includes axial and radial relief surfaces connected by a corner relief surface, as well as rake surface having a rake ridge. The rake ridge is continuously curved from a bisector line until at least an axial location rearward of the corner relief surface.
Claims22
A cemented carbide corner radius end mill (10) having a rotation axis (12) defining forward and rearward directions (DF, DR), and comprising:
- front and rear ends (14, 16) and a peripheral surface (18) extending therebetween;
- a cutting portion (20) extending rearwardly from the front end (14);
- and
- a shank portion (22) located rearward of the cutting portion (20);
- the cutting portion (20) having a cutting portion diameter DE at the front end (14) and an effective cutting length (LE) and comprising:
- integrally formed teeth (24) extending from the front end (14) in the rearward direction, along the peripheral surface (18);
- and
- a helical flute (26) located between each pair of adjacent teeth (24) and having a helix angle H fulfilling the condition:
- 25°≤H≤60°;
- an index angle S subtended between each pair of adjacent teeth (24);
- each tooth (24) comprising:
- a relief surface (28);
- a rake surface (30);
- a cutting edge (32) formed at an intersection of the relief and rake surfaces (28, 30);
- and
- a corner (34) comprising a circular arc profile defining a portion (36) of a circle (IC) having a circle center point (CC), a circle radius RC, axial and radial tangent lines (LA, LR), and a bisector line (LB);
- the relief surface (28) comprising:
- an axial relief surface (28A) at the front end (16);
- a radial relief surface (28B) at the peripheral surface (18);
- and
- a corner relief surface (28C) connecting the axial and radial relief surfaces (28A, 28B);
- the rake surface (30) comprising:
- a rake cutting sub-surface (30A) extending adjacent the cutting edge (32);
- a rake recessed sub-surface (30B);
- and
- a rake ridge (30C) formed at an intersection of the rake cutting and rake recessed sub-surfaces (30A, 30B) wherein
- the rake cutting sub-surface (30A) is closer to the cutting edge (32) than the rake recessed sub-surface (30B);
- the cutting edge (32) comprising:
- an axial sub-edge (32A) at the front end (14) extending to the axial tangent line (LA);
- a corner sub-edge (32B) extending from the axial tangent line (LA) to the radial tangent line (LR);
- and
- a radial sub-edge (32C) extending rearward from the radial tangent line (LR);
- between the rake ridge (30C) and the cutting edge (32):
- a radial cutting sub-surface width WR is measurable along the radial tangent line (LR);
- a bisector cutting sub-surface width WB is measurable along the bisector line (LB);
- and
- an axial cutting sub-surface width WA is measurable along the axial tangent line (LA);
- wherein the rake ridge (30C) of one or more of the teeth (34) is continuously curved from the bisector line (LB) until at least an axial location rearward of the corner relief surface (28C);
- wherein the radial cutting sub-surface width WR and bisector cutting sub-surface width WB fulfill the condition:
- 0.9WB≤WR≤1.1WB.
37 more elements
Dependencies are inferred from the claim text.