Drilling tool

Patent metadata

Field	Value
Publication number	US-9561549-B2
Application number	US-201313942970-A
Country	US
Kind code	B2
Filing date	Jul 16, 2013
Priority date	Jul 16, 2012
Publication date	Feb 7, 2017
Grant date	Feb 7, 2017

Abstract

A drilling tool for machining structural components made of a titanium alloy includes: a support, which extends along an axis of rotation in the axial direction, the support having an end face with a receptacle disposed centrally therein; a plurality of cutting inserts inserted at the end face in a manner that forms a flat drill, each cutting insert having an active insert cutting edge extending transversely to the axial direction; and a drilling tip disposed in the receptacle and having at least two tip cutting edges, the tip cutting edges extending outward from the axis of rotation and being adjoined in each case by at least one active insert cutting edge.

First claim

We claim:

1. A drilling tool for machining structural components made of a titanium alloy, the drilling tool comprising:
a support, which extends along an axis of rotation in the axial direction, the support having an end face with a receptacle disposed centrally therein;
a plurality of cutting inserts inserted at the end face in a manner that forms a flat drill, each cutting insert having an active insert cutting edge extending transversely to the axial direction in a common plane in the horizontal direction; and
wherein each active insert cutting edge extends along a major dimension associated with each cutting insert, when viewed with respect to the common plane;
a drilling tip disposed in the receptacle and having at least two tip cutting edges, the tip cutting edges extending outward from the axis of rotation and being adjoined in each case by at least one active insert cutting edge,
wherein the tip cutting edges each have an outer cutting region which extends transversely to the axial direction and which lies at the same axial height as the active insert cutting edges.

2. The drilling tool of claim 1 wherein the drilling tip has an outer radius and wherein the outer cutting region extends in the radial direction over at least 0.4 times the outer radius.

3. The drilling tool of claim 1 wherein each outer cutting region is adjoined by a pitched cutting edge toward the axis of rotation, and wherein the pitched cutting edges include a point angle in the range of 120° to 150°.

4. The drilling tool of claim 1 wherein the drilling tip has a frontmost point, lying on the axis of rotation, which protrudes in the axial direction by a height of at most 0.4 mm beyond the active insert cutting edges.

5. The drilling tool of claim 1 wherein each tip cutting edge is assigned at least a leading cutting insert and a trailing cutting insert, which are offset in relation to one another in an overlapping manner in the radial direction.

6. The drilling tool of claim 5 wherein each tip cutting edge is assigned two leading cutting inserts, which are spaced apart from one another in the radial direction by a gap, which is covered by the trailing cutting insert in the radial direction.

7. The drilling tool of claim 1 wherein the support includes a plurality of flutes running in the support respectively, each flute adjoining a respective one of the tip cutting edges or the insert cutting edges.

8. The drilling tool of claim 7 , wherein the flutes adjoining the tip cutting edges have a higher surface quality than the flutes adjoining the insert cutting edges.

9. The drilling tool of claim 7 , wherein the flutes adjoining the tip cutting edges run separated over their entire length from the flutes adjoining the insert cutting edges.

10. The drilling tool of claim 1 , wherein each cutting edge is respectively assigned at least one coolant duct emerging in particular on the end face.

11. A process for machining a component, the process comprising forming a blind hole with the aid of the drilling tool of claim 1 .

12. The process of claim 11 further comprising:
inserting a milling cutter into the drilled blind hole; and
milling a pocket having a planar pocket base out of the component;
wherein, to this end, a material removal is performed proceeding from a drilled base of the blind hole in the axial direction, the depth of which material removal corresponds to a height by which a frontmost point of the drill tip protrudes beyond the insert cutting edges.

13. The method of claim 11 , wherein forming the blind hole is performed at a feed rate of between 0.08 and 0.14 mm per revolution and cutting tooth.

14. The drilling tool of claim 1 , wherein the plurality of cutting inserts are arranged to form at least two effective cutting teeth.

15. The drilling tool of claim 14 , wherein each cutting tooth comprises a row of leading cutting inserts and a row of trailing cutting inserts, the row of trailing cutting inserts being rotationally offset from the row of leading cutting inserts.

16. The drilling tool of claim 15 , wherein the row of leading cutting inserts is rotationally offset from the row of trailing cutting inserts by an angle between 45° and 75°.

17. The drilling tool of claim 15 , wherein each row of leading cutting inserts and each row of trailing cutting inserts comprises two of the plurality of cutting inserts.

18. The drilling tool of claim 15 , wherein:
the row of leading cutting inserts of a first tooth is rotationally offset from the row of leading cutting inserts of a second tooth by 180°; and
the row of trailing cutting inserts of the first tooth is rotationally offset from the row of trailing cutting inserts of the second tooth by 180°.

19. The drilling tool of claim 1 , wherein the drilling tip has lateral contact surfaces having an obtuse angled form.

20. The drilling tool of claim 1 , wherein each active insert cutting edge extends along a radial direction with respect to a longitudinal axis of the drilling tool.

21. A drilling tool for machining structural components made of a titanium alloy, the drilling tool comprising:
a support, which extends along an axis of rotation in the axial direction, the support having an end face with a receptacle disposed centrally therein;
a plurality of cutting inserts inserted at the end face in a manner that forms a flat drill, each cutting insert having an active insert cutting edge extending transversely to the axial direction in a common plane in the horizontal direction; and
a drilling tip disposed in the receptacle and having at least two tip cutting edges, the tip cutting edges extending outward from the axis of rotation and being adjoined in each case by at least one active insert cutting edge,
wherein the tip cutting edges each have an outer cutting region which extends transversely to the axial direction and which lies at the same axial height as the active insert cutting edges,
wherein the plurality of cutting inserts are arranged to form at least two effective cutting teeth,
wherein each cutting tooth comprises a row of leading cutting inserts and a row of trailing cutting inserts, the row of trailing cutting inserts being rotationally offset from the row of leading cutting inserts, and
wherein the row of leading cutting inserts is rotationally offset from the row of trailing cutting inserts by an angle between 45° and 75°.

22. A drilling tool for machining structural components made of a titanium alloy, the drilling tool comprising:
a support, which extends along an axis of rotation in the axial direction, the support having an end face with a receptacle disposed centrally therein;
a plurality of cutting inserts inserted at the end face in a manner that forms a flat drill, each cutting insert having an active insert cutting edge extending transversely to the axial direction in a common plane in the horizontal direction; and
a drilling tip disposed in the receptacle and having at least two tip cutting edges, the tip cutting edges extending outward from the axis of rotation and being adjoined in each case by at least one active insert cutting edge,
wherein the tip cutting edges each have an outer cutting region which extends transversely to the axial direction and which lies at the same axial height as the active insert cutting edges,
wherein the plurality of cutting inserts are arranged to form at least two effective cutting teeth,
wherein each cutting tooth comprises a row of leading cutting inserts and a row

Assignees

• Kennametal Inc
• Kennametal Inc

Inventors

• Fraese Alex
• Herdegen Holger

Classifications

• Y10T408/45

  including Tool with duct · CPC title

• Y10T408/03

  Processes · CPC title

• B23B51/0493

  with exchangeable cutting inserts, e.g. able to be clamped · CPC title

• B23B2251/50

  Drilling tools comprising cutting inserts · CPC title

• B23B2251/04

  Angles, e.g. cutting angles · CPC title