Micro end mill and method of manufacturing same

• US 9,643,282 B2
• Filed: 10/17/2014
• Issued: 05/09/2017
• Est. Priority Date: 10/17/2014
• Status: Active Grant

• Current Assignee: Kennametal Incorporated
• Original Assignee: Kennametal Incorporated
• Inventors: Kondameedi, Naveen, Arns, David A.
• Primary Examiner(s): FRIDIE JR, WILLMON
• Application Number:
  US14/517,347
• Publication Number:
  US 20160107264A1
• Time in Patent Office: 935 Days
• CPC Class Codes: B23C 2210/03 Cutting heads comprised of different material than the shank irrespective of whether the head is detachable from the shank
• CPC Class Codes: B23C 2226/125 cubic [CBN]
• CPC Class Codes: B23C 2226/315 polycrystalline [PCD]
• CPC Class Codes: B23C 5/10 Shank-type cutters, i.e. with an integral shaft
• CPC Class Codes: B23C 5/1009 Ball nose end mills
• CPC Class Codes: B23K 1/0008 specially adapted for particular articles or work
• CPC Class Codes: B23K 2101/002 Drill-bits
• CPC Class Codes: B23K 2101/20 Tools
• CPC Class Codes: B23K 2103/04 Steel or steel alloys
• CPC Class Codes: B23K 2103/18 Dissimilar materials
• CPC Class Codes: B23K 2103/50 Inorganic material, e.g. metals, not provided for in B23K2103/02 – B23K2103/26
• CPC Class Codes: B23K 2103/52 Ceramics
• CPC Class Codes: B23K 26/0622 by shaping pulses
• CPC Class Codes: B23K 26/146 the fluid stream containing a liquid
• CPC Class Codes: B23K 26/36 Removing material B23K26/55, B23K26/57 take precedence
• CPC Class Codes: B23K 26/402 involving non-metallic material, e.g. isolators
• CPC Class Codes: B23P 15/34 milling cutters

Abstract

A micro end mill includes a shank made of a first material and a cutting tip made of a second, different material that is bonded to the shank. The first material can be, for example, carbide or high speed steel (HSS), and the second material can be, for example, cubic boron nitride (CBN), polycrystalline cubic boron nitride (PCBN), ceramic or polycrystalline diamond (PCD). The micro end mill is manufactured by producing a billet made of Superhard material using laser radiation, bonding the billet to a shank of the end mill, and removing material from the billet using laser radiation to produce a cutting tip made of the Superhard material. The laser radiation may comprise a laser beam encased in a water jet or a laser beam with a non-Gaussian intensity profile.

Claims

1. A method of manufacturing a micro end mill with a cutting tip, comprising:

producing a billet made of Superhard material using laser radiation;

bonding the billet to a shank of the end mill, the shank made of different material than the billet; and

removing material from the billet using laser radiation to produce a cutting tip made of the Superhard material;

wherein the laser radiation comprises a laser beam encased in a water jet.

2. The method of claim 1, wherein the Superhard material has a hardness value exceeding 40 gigapascals (GPa).

3. The method of claim 2, wherein the Superhard material has a hardness value between 55 to 62 GPa.

4. The method of claim 1, wherein the Superhard material comprises one of cubic boron nitride (CBN), polycrystalline cubic boron nitride (PCBN), ceramic and polycrystalline diamond (PCD), and wherein the shank is made of one of carbide and high speed steel (HSS).

5. The method of claim 1, wherein the cutting tip has a plurality of helical flutes.

6. The method of claim 1, wherein the micro end mill has a cutting diameter of between 0.5 mm to 10 mm.

7. The method of claim 1, wherein the billet is bonded to the shank by brazing.

8. The method of claim 1, wherein the laser radiation has a non-Gaussian intensity profile.

9. A micro end mill manufactured using the method of claim 1, the micro end mill comprising a cutting tip made of the Superhard material bonded to a shank made of a different material.

10. The end mill of claim 9, wherein the cutting tip has a plurality of helical flutes.

11. The end mill of claim 9, wherein the shank is made of one of carbide and high speed steel (HSS).

12. The end mill of claim 9, wherein the Superhard material has a hardness value exceeding 40 gigapascals (GPa).

13. The end mill of claim 12, wherein the Superhard material has a hardness value between 55 to 62 GPa.

14. The end mill of claim 9, wherein the Superhard material comprises one of cubic boron nitride (CBN), polycrystalline cubic boron nitride (PCBN), ceramic and polycrystalline diamond (PCD), and wherein the shank is made of one of carbide and high speed steel (HSS).

15. A method of manufacturing a micro end mill with a cutting tip, comprising:

producing via laser radiation, from a disc of Superhard material, a billet made of the Superhard material;

bonding the billet to a shank of the micro end mill, the shank made of different material than the billet; and

thereafter machining the billet to a final predetermined shape, to produce a cutting tip made of the Superhard material;

said machining comprising removing material from the billet using laser radiation;

wherein said removing comprises removing a three-dimensional volume from the billet using laser radiation, to create helical flutes and cutting edges.

16. The method of claim 15, wherein the billet is generally cylindrical in shape.

17. The method of claim 16, wherein the billet has a thickness of up to about 15 mm.

18. The method of claim 15, wherein the billet is bonded to the shank by brazing.

19. The method of claim 15, wherein the laser radiation comprises a laser beam encased in a water jet.

20. The method of claim 15, comprising truing the billet with respect to the shank via removing material from the billet using laser radiation.