Compound fillet radii cutter

Patent metadata

Field	Value
Publication number	US-10040137-B2
Application number	US-201515032016-A
Country	US
Kind code	B2
Filing date	Jan 15, 2015
Priority date	Jan 28, 2014
Publication date	Aug 7, 2018
Grant date	Aug 7, 2018

Abstract

A compound fillet radii cutter may have a shaft having a cylindrical member, frustoconical cutting surface, a small radius cutting surface having an arc length of a first circle, and a large radius cutting surface having an arc length of a second circle. The frustoconical cutting surface may be disposed between the cylindrical member and the small radius cutting surface. The small radius cutting surface may be disposed between the frustoconical cutting surface and the large radius cutting surface, and a juncture of the large radius cutting surface and the small radius cutting surface may form a tangential union. In this manner, a single cutter may cut radii of various sizes or cut compound radii.

First claim

What is claimed is:

1. A compound fillet radii cutter comprising:
a shaft;
a linear frustoconical cutting surface, wherein a constant angle is disposed between the shaft and the linear frustoconical cutting surface;
a small radius cutting surface comprising an arc length of a first circle; and
a large radius cutting surface comprising an arc length of a second circle,
wherein the linear frustoconical cutting surface is disposed along the constant angle between the shaft and the small radius cutting surface,
wherein the small radius cutting surface is disposed between the linear frustoconical cutting surface and the large radius cutting surface,
wherein a juncture of the small radius cutting surface and the large radius cutting surface comprises a tangential union, and
wherein a profile of a tip of the compound filet radii cutter resembles an ellipsoid.

2. The compound fillet radii cutter according to claim 1 , wherein a radius of the first circle is smaller than a radius of the second circle.

3. The compound fillet radii cutter according to claim 1 , wherein the shaft comprises a cylindrical member.

4. The compound fillet radii cutter according to claim 1 , wherein the shaft and the linear frustoconical cutting surface are both symmetric about a centerline.

5. The compound fillet radii cutter according to claim 1 , wherein the linear frustoconical cutting surface is cylindrical.

6. The compound fillet radii cutter according to claim 1 , further comprising a tip notch wherein the tip notch comprises an aperture disposed in center of the large radius cutting surface.

7. The compound fillet radii cutter according to claim 1 , further comprising a tip notch wherein the tip notch comprises a cylindrical aperture in the large radius cutting surface extending inwardly along a centerline and terminating in a cavity floor.

8. The compound fillet radii cutter according to claim 1 , wherein the cutter comprises a coating.

9. The compound fillet radii cutter according to claim 8 , wherein the coating comprises cubic boron nitride.

10. The compound fillet radii cutter according to claim 1 , wherein the cutter comprises microcarbide.

11. A method of milling a workpiece comprising:
mounting a cutter to a tool articulator, wherein the cutter comprises:
a shaft;
a linear frustoconical cutting surface, wherein a constant angle is disposed between the shaft and the linear frustoconical cutting surface;
a small radius cutting surface comprising an arc length of a first circle; and
a large radius cutting surface comprising an arc length of a second circle,
wherein the linear frustoconical cutting surface is disposed along the constant angle between the shaft and the small radius cutting surface,
wherein the small radius cutting surface is disposed between the linear frustoconical cutting surface and the large radius cutting surface,
wherein a juncture of the small radius cutting surface and the large radius cutting surface comprises a tangential union,
wherein a radius of the first circle is smaller than a radius of the second circle; positioning the cutter above a workpiece, and
wherein a profile of a tip of the compound filet radii cutter resembles an ellipsoid; spinning the cutter about a centerline;

moving the tool articulator whereby the cutter is positioned so that the small radius cutting surface contacts the workpiece; and
translating the tool articulator whereby the cutter translates while maintaining contact with the workpiece.

12. A method according to claim 11 , further comprising moving the tool articulator whereby the cutter is positioned so that the large radius cutting surface contacts the workpiece.

13. A method according to claim 11 , further comprising moving the tool articulator whereby the cutter is positioned so that the linear frustoconical cutting surface of the cutter contacts the workpiece.

14. A method according to claim 11 , wherein the workpiece comprises at least one of: aluminum, steel, titanium, or nickel alloy.

15. A method according to claim 11 , wherein the large radius cutting surface and the small radius cutting surface contact the workpiece simultaneously.

16. A method according to claim 11 , wherein the small radius cutting surface and the linear frustoconical cutting surface contact the workpiece simultaneously.

17. A compound fillet radii cutter comprising:
a shaft;
a linear frustoconical cutting surface, wherein a constant angle is disposed between the shaft and the linear frustoconical cutting surface;
a first radius cutting surface comprising an first arc length of a first circle having a first radius;
a second radius cutting surface comprising a second arc length of a second circle having a second radius that is the same as the first radius such that the first radius cutting surface is a mirror image of the second radius cutting surface translated about a point,
wherein the first radius cutting surface is disposed between the linear frustoconical cutting surface and the second radius cutting surface, and
wherein a juncture of the first radius cutting surface and the second radius cutting surface comprises a local disconnect.

Assignees

• United Technologies Corp

Inventors

• Wu Chung Y

Classifications

• B23C2210/084

  Curved cutting edges · CPC title

• Y10T409/303808

  including infeeding · CPC title

• B23C5/10 Primary

  Shank-type cutters, i.e. with an integral shaft · CPC title

• B23C2222/04

  Aluminium · CPC title

• B23C5/1009

  Ball nose end mills · CPC title