Cutting tools for cutting curved and complex features

Patent metadata

Field	Value
Publication number	US-9302334-B2
Application number	US-201313840335-A
Country	US
Kind code	B2
Filing date	Mar 15, 2013
Priority date	May 29, 2012
Publication date	Apr 5, 2016
Grant date	Apr 5, 2016

Abstract

The embodiments described herein relate to methods, systems, and structures for cutting a part to form a highly reflective and smooth surface. In some embodiments, the part includes substantially horizontal and vertical surfaces with edges and corners. In described embodiments, a diamond cutter can be used to cut a surface of the part during a milling operation where the diamond cutter contacts the part a number of times with each rotation of the spindle of a milling machine. In some embodiments, a complex feature having planar and curved surfaces is cut into a part.

First claim

What is claimed is:

1. A cutting tool assembly arranged to perform a cutting operation along an edge of a part, comprising:
a tool holder configured to rotate about an axis;
a first cutting tool attached to the tool holder and comprising a first cutting edge, the first cutting edge having a straight cutting surface configured to cut a planar surface along the edge of the part, the planar surface meeting an adjacent surface at a junction region; and
a second cutting tool attached to the tool holder and comprising a second cutting edge having a curved cutting surface, the curved cutting surface configured to round the junction region between the planar surface and the adjacent surface.

2. The cutting tool assembly of claim 1 , wherein at least one of the first cutting tool or the second cutting tool is comprised of mono crystalline diamond.

3. The cutting tool assembly of claim 1 , wherein at least one of the first cutting tool or the second cutting tool is comprised of poly crystalline diamond.

4. The cutting tool assembly of claim 1 , further comprising:
a third cutting tool attached to the tool holder and comprising a third cutting edge having a second curved cutting surface, the second curved cutting surface configured to round a second junction region between the planar surface and a second adjacent surface of the part.

5. The cutting tool assembly of claim 4 , wherein the curved cutting surface of the second cutting tool is characterized as having a first radius of curvature and the second curved cutting surface of the third cutting tool is characterized as having a second radius of curvature, wherein the first radius of curvature is the same as the second radius of curvature.

6. The cutting tool assembly of claim 1 , wherein the first cutting tool comprises a first shank and a first cutter, wherein the second cutting tool comprises a second shank and a second cutter, wherein the first cutter is attached to the first shank and the second cutter is attached to the second shank.

7. The cutting tool assembly of claim 1 , wherein the first cutting tool is at a first radial distance from the axis and the second cutting tool is at a second radial distance from the axis, the first radial distance is the same as the second radial distance.

8. The cutting tool assembly of claim 1 , wherein the first cutting tool is at a first radial distance from the axis and the second cutting tool is at a second radial distance from the axis, the first radial distance is different than the second radial distance.

9. The cutting tool assembly of claim 1 , wherein the cutting tool assembly is configured to operate with a computer numerical control (CNC) milling machine.

10. The cutting tool assembly of claim 1 , wherein the first cutting tool and the second cutting tool are positioned at equidistant locations along a circumference of the tool holder.

11. A method of cutting along an edge of a part using a cutting tool assembly comprising a tool holder and a first cutting tool and a second cutting tool attached to the tool holder, the tool holder configured to rotate about an axis, the method comprising rotating the first cutting tool and second cutting tool about the axis such that:
the first cutting tool cuts a planar surface along the edge of the part the first cutting tool having a first cutting edge having a straight cutting surface, the planar surface meeting an adjacent surface at a junction region; and
the second cutting tool rounds the junction region between the planar surface and the adjacent surface, the second cutting tool having a second cutting edge having a curved cutting surface.

12. The method of claim 11 , wherein one or both of the first cutting tool and the second cutting tool is a mono crystalline diamond cutter.

13. The method of claim 11 , wherein one or both of the first cutting tool and the second cutting tool is a poly crystalline diamond cutter.

14. The method of claim 11 , wherein the first cutting tool is at a first radial distance from the axis and the second cutting tool is at a second radial distance from the axis, the first radial distance is the same as the second radial distance.

15. The method of claim 11 , wherein the first cutting tool is at a first radial distance from the axis and the second cutting tool is at a second radial distance from the axis, the first radial distance is different than the second radial distance.

16. The method of claim 11 , wherein cutting along the edge comprises translating the cutting tool assembly along the edge of the part.

17. The method of claim 11 , wherein the cutting tool assembly further comprises a third cutting tool attached to the tool holder, the method further comprising rotating the third cutting tool about the axis such that:
the third cutting tool rounds a second junction region between the planar surface and a second adjacent surface of the part, the third cutting tool having a third cutting edge having a second curved cutting surface.

18. The method of claim 17 , wherein the curved cutting surface of the second cutting tool is characterized as having a first radius of curvature and the second curved cutting surface of the third cutting tool is characterized as having a second radius of curvature, wherein the first radius of curvature is the same as the second radius of curvature.

19. The method of claim 17 , wherein cutting along the edge of the part forms a curved chamfer along the edge of the part.

20. A cutting tool assembly arranged to form a rounded chamfer along an edge of a part, comprising:
a tool holder that rotates a first cutter and a second cutter about an axis, the first cutter having a straight cutting edge and the second cutter having a curved cutting edge, wherein when the tool holder is rotated about the axis and translated along the edge of the part:
the first cutter cuts a planar surface along the edge, the planar surface meeting an adjacent surface at a junction region, and
the second cutter rounds the junction region between the planar surface and the adjacent surface.

21. The cutting tool assembly of claim 20 , wherein the second cutter has a concave shaped cutting edge.

22. The cutting tool assembly of claim 20 , wherein the second cutter is affixed to a shank that is adjustably coupled to the tool holder such that a radial distance of the second cutter with respect to the axis is adjustable.

23. The cutting tool assembly of claim 22 , wherein adjusting the radial distance corresponds to adjusting an amount of rounding of the junction region.

Assignees

• Apple Inc

Inventors

• Tan Napthaneal Y
• Huang Chien-Ming
• Yundi Yu
• Lu Zhoujun

Classifications

• B23C3/12 Primary

  Trimming or finishing edges, e.g. deburring welded corners · CPC title

• B23C2226/31

  Diamond · CPC title

• Y10T409/303752

  Process · CPC title

• B23B2270/26

  Burnishing · CPC title

• B23C5/10 Primary

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