Ramping insert and high-feed milling tool assembly

Patent metadata

Field	Value
Publication number	US-9901992-B2
Application number	US-201615189415-A
Country	US
Kind code	B2
Filing date	Jun 22, 2016
Priority date	Dec 23, 2014
Publication date	Feb 27, 2018
Grant date	Feb 27, 2018

Abstract

A high-feed milling tool assembly includes a tool and a ramping insert. The ramping insert includes ramping, feed and side sub-edges. The ramping and feed sub-edges are longer than the side sub-edges and converge with increasing proximity to the side sub-edge to which they are both connected.

First claim

What is claimed is:

1. A ramping insert comprising:
opposing first and second rake surfaces; an insert peripheral surface connecting the first and second rake surfaces; an insert screw hole opening out to opposing sides of the insert peripheral surface, the insert screw hole having an insert screw hole axis; and first and second cutting edges extending along an intersection of the insert peripheral surface and a corresponding one of the first and second rake surfaces;

each of the first and second cutting edges comprising:
a first ramping sub-edge; a first side sub-edge; a first feed sub-edge connected to the first ramping sub-edge and the first side sub-edge; a second ramping sub-edge connected to the first side sub-edge; a second side sub-edge connected to the first ramping sub-edge; and a second feed sub-edge connected to the second ramping sub-edge and the second side sub-edge;

wherein:
each of the ramping and feed sub-edges is longer than each of the side sub-edges; a maximum rake surface length of each rake surface is measurable between the first and second side sub-edges thereof, and each of the ramping and feed sub-edges converge with increasing proximity to the side sub-edge to which they are both connected;

wherein:
each ramping sub-edge comprises a sharp ramp corner portion, said sharp ramp corner portion being a corner portion of the ramping sub-edge closest to a feed sub-edge; each feed sub-edge comprises a sharp feed corner portion adjacent to one of said sharp ramp corner portions; and a connection point of the ramping sub-edge to the feed sub-edge is located in the middle of a corner formed by the adjacent corner portions.

2. The ramping insert according to claim 1 , wherein connection points of adjacent ramping and feed sub-edges are located on different sides of a median thickness plane.

3. The ramping insert according to claim 1 , wherein the feed sub-edges are longer than the ramping sub-edges.

4. The ramping insert according to claim 1 , wherein the insert peripheral surface is devoid of relief portions.

5. The ramping insert according to claim 1 , wherein each side sub-edge comprises a straight portion.

6. The ramping insert according to claim 5 , wherein the straight portions of the side sub-edges on the first and second rake surfaces are parallel to the straight portions on only the same rake surface.

7. The ramping insert according to claim 5 , wherein the straight portions have a length which is 15%±5% of a maximum thickness of the insert measurable parallel to the median thickness plane.

8. The ramping insert according to claim 5 , wherein the straight portions have a length which is 13%±5% of an overall length of the ramping sub-edge and/or a length which is 13%±5% of an overall length of the feed sub-edge.

9. The ramping insert according to claim 1 , further comprising:
a maximum height which is measurable parallel to a rake axis extending through a center of the first and second rake surfaces; and a maximum thickness of the ramping insert which is measurable parallel to the median thickness plane; the maximum height is greater than the maximum thickness.

10. The ramping insert according to claim 1 , wherein the insert is 180° rotationally symmetric about a rake axis extending through the center of the first and second rake surfaces and/or 180° rotationally symmetric about a height axis perpendicular to the rake axis and extending along an intersection of median thickness and height planes.

11. The ramping insert according to claim 1 , wherein a central rake surface region of each rake surface is planar.

12. The ramping insert according to claim 1 , wherein a straight extension defined between discontinuity points of the sharp ramp and feed corner portions has a length between 0.5 mm to 2.0 mm.

13. The ramping insert according to claim 12 , wherein the straight extension has a length less than 0.75 mm.

14. The ramping insert according to claim 1 , wherein a straight extension defined between discontinuity points of the sharp ramp and feed corner portions has a length smaller than a quarter of the length of a straight portion of the feed sub-edge comprising the sharp feed corner portion.

15. The ramping insert according to claim 14 , wherein a straight extension defined between discontinuity points of the sharp ramp and feed corner portions has a length smaller than or equal to a sixth of the length of the straight portion of the feed sub-edge comprising the sharp feed corner portion.

16. The ramping insert according to claim 1 , wherein a straight portion of the ramping sub-edge has a length of 70%±15% of the length of a straight portion of the adjacent feed sub-edge.

17. The ramping insert according to claim 1 , wherein each of the first and second cutting edges lies in a plane.

Assignees

• Iscar Ltd

Inventors

• Hecht Gil
• Atar Osama
• Qeys Talal

Classifications

• B23C5/2213

  having a special shape · CPC title

• B23C5/202

  Plate-like cutting inserts with special form (special form related to securing of the insert B23C5/22) · CPC title

• B23C2200/205

  Discontinuous cutting edges · CPC title

• B23C2200/164

  discontinuous · CPC title

• B23C2200/125

  discontinuous · CPC title