Diamond cutting tools

Patent metadata

Field	Value
Publication number	US-9545024-B2
Application number	US-201213610838-A
Country	US
Kind code	B2
Filing date	Sep 11, 2012
Priority date	May 29, 2012
Publication date	Jan 10, 2017
Grant date	Jan 10, 2017

Abstract

The embodiments described herein relate to methods, systems, and structures for cutting a part to form a highly reflective and smooth surface thereon. In some embodiments, the part includes substantially horizontal and vertical surfaces with edges and corners. In described embodiments, a diamond cutter is 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. The diamond cutter has a cutting edge and a land. The cutting edge cuts the surface of the part and the land burnishes the surface of the part to form a highly reflective and smooth surface. Thus, the diamond cutter cuts and burnishes portions of the part, thereby eliminating a subsequent polishing step.

First claim

What is claimed is:

1. A cutting tool assembly comprising:
a holder configured to rotate about an axis; and
a cutting tool radially attached to the holder such that the cutting tool rotates about the axis during a cutting operation, the cutting tool comprising:
a shank having a first end secured to the holder, and
a cutter attached to a second end of the shank opposite the first end, the cutter comprising a cutting edge, a heel and a land corresponding to a substantially flat surface between the cutting edge and the heel, wherein during the cutting operation the cutting edge and the land are substantially parallel to the axis, wherein the cutting edge cuts material from a workpiece to form a surface of the workpiece having peaks and troughs, and the land removes at least a portion of the peaks, thereby burnishing the surface of the workpiece, wherein a relative angle of the land with respect to the cutting edge is adjustable so as to control an amount of burnishing by the land.

2. The cutting tool assembly as recited in claim 1 , wherein the heel engages with the surface of the workpiece during the cutting operation.

3. The cutting tool assembly as recited in claim 1 , wherein a distance between successive peaks is proportionally related to a cutting radius, the cutting radius being a measurement from the axis to the cutting edge.

4. The cutting tool assembly as recited in claim 1 , wherein the shank is in a substantially perpendicular orientation with respect to the axis during the cutting operation.

5. The cutting tool assembly as recited in claim 1 , wherein the holder is configured to be positioned in a milling machine.

6. The cutting tool assembly as recited in claim 5 , wherein the cutting tool is configured to cut the workpiece in an interrupted cutting operation wherein the cutting tool engages with and disengages from the workpiece a plurality of times.

7. The cutting tool assembly as recited in claim 1 , wherein the shank and the cutter are attached using a braising procedure.

8. The cutting tool assembly as recited in claim 1 , wherein the cutting tool assembly includes a plurality of cutting tools radially attached to the holder.

9. A method of cutting a workpiece using a cutting tool assembly, the cutting tool assembly comprising:
a holder configured to rotate about an axis; and
a cutting tool radially attached to the holder, the cutting tool comprising:
a shank having a first end secured to the holder, and
a cutter attached to a second end of the shank opposite the first end, the cutter comprising a cutting edge, a heel and a land disposed between the cutting edge and the heel, wherein the heel is recessed relative to the cutting edge with respect to a cutting arc of the cutter, wherein during a cutting operation:
the cutting edge and the land are substantially parallel to the axis,
the cutting tool rotates about the axis such that the cutting edge removes material from the workpiece to form peaks and troughs on a surface of the workpiece, and
the land removes at least a portion of the peaks, thereby smoothing the surface of the workpiece; and
wherein cutting the workpiece includes adjusting a relative angle of the land with respect to the cutting edge so as to control an amount of burnishing by the land.

10. The method as recited in claim 9 , wherein a distance between successive peaks is proportionally related to a cutting radius, the cutting radius being a measurement from the axis to the cutting edge.

11. The method as recited in claim 9 , wherein the heel engages with the surface of the workpiece during the cutting operation.

12. The method as recited in claim 9 , wherein the cutter is comprised of diamond.

13. A cutting tool assembly comprising:
a holder configured to rotate about an axis; and
a cutting tool radially attached to the holder, the cutting tool comprising:
a shank having a first end secured to the holder, and
a cutter attached to a second end of the shank opposite the first end, the cutter comprising a cutting edge, a heel and a land disposed between the cutting edge and the heel, wherein the heel is recessed relative to the cutting edge with respect to a cutting arc of the cutter, and wherein a relative angle of the land with respect to the cutting edge is adjustable, wherein during a cutting operation:
the cutting edge and the land are substantially parallel to the axis,
the cutting tool rotates about the axis such that the cutting edge removes material from a workpiece to form peaks and troughs on a surface of the workpiece, and
the land removes at least a portion of the peaks, thereby smoothing the surface of the workpiece.

14. The cutting tool assembly as recited in claim 13 , wherein cutting tool corresponds to a first cutting tool having a first shank and a first cutter, wherein the cutting tool assembly includes a second cutting tool having a second shank and a second cutter, the second cutter including a second cutting edge and a second land that are substantially parallel to the axis.

15. The cutting tool assembly as recited in claim 13 , wherein the shank is in a substantially parallel orientation with respect to the axis during the cutting operation.

16. The cutting tool assembly as recited in claim 13 , wherein the cutter is comprised of diamond.

17. The cutting tool assembly as recited in claim 16 , wherein the cutter is comprised of a polycrystalline diamond or a mono crystalline diamond.

18. The cutting tool assembly as recited in claim 13 , wherein the holder is cylindrical in shape.

Assignees

• Tan Napthaneal Y
• Huang Chien-Ming
• Lee Long Hin
• Guojin Lu
• Yundi Yu
• Peng Lv
• Yifeng Yu
• Chendong Wu
• Ze Shi
• Apple Inc

Inventors

• Tan Napthaneal Y
• Huang Chien-Ming
• Lee Long Hin
• Guojin Lu
• Yundi Yu
• Peng Lv
• Yifeng Yu
• Chendong Wu
• Ze Shi

Classifications

• H05K5/04 Primary

  Metal casings · CPC title

• H04B1/3827

  Portable transceivers · CPC title

• C25D11/34

  of metals or alloys not provided for in groups C25D11/04 - C25D11/32 · CPC title

• B23C2226/31

  Diamond · CPC title

• C25D11/02

  Anodisation · CPC title