Cutting tool and method for producing a cutting tool

Patent metadata

Field	Value
Publication number	US-9895751-B2
Application number	US-201414896264-A
Country	US
Kind code	B2
Filing date	Jun 3, 2014
Priority date	Jun 4, 2013
Publication date	Feb 20, 2018
Grant date	Feb 20, 2018

Abstract

The cutting tool ( 1 ), especially drill or milling cutter, comprises a base ( 3 ) which extends in an axial direction ( 2 ) and has an outer shell ( 14 ) with at least one interior recess ( 18 ) that extends in the axial direction ( 2 ), a supporting structure ( 16 ) having at least one separating piece ( 26 ) which separates a plurality of recesses ( 18 ) from each other being formed in the supporting structure. The cutting tool ( 1 ) is particularly a solid hard-metal tool. The supporting structure ( 16 ) ensures an efficient use of material.

First claim

The invention claimed is:

1. A cutting tool, in particular a drill, comprising:
a base body extending in an axial direction from a rear clamping shaft at a rear end to a front tool tip at a front end, the base body having an outer shell with at least one inner recess extending axially, wherein within the recess defined by the outer shell a support structure is formed with at least one separating web by means of which a plurality of recesses are separated from each other,
wherein the plurality of recesses are channels extending in the axial direction, the channels extending through an entirety of the rear clamping shaft from the rear end to at least the front tool tip.

2. The cutting tool according to claim 1 , wherein the support structure is grid-like when viewed in cross section.

3. The cutting tool according to claim 2 , wherein the separating webs are flat, plate-shaped struts.

4. The cutting tool according to claim 3 , wherein the cutting tool has a central longitudinal axis extending in the axial direction; and
wherein the flat, plate-shaped struts extend generally parallel to the central longitudinal axis of the cutting tool.

5. The cutting tool according to claim 1 , wherein the outer shell is approximately annular and surrounds at least one centered central space.

6. The cutting tool according to claim 1 , wherein the supporting structure is designed as a separate insert.

7. The cutting tool according to claim 1 , wherein the supporting structure is formed of a material that is different from the material of the outer shell.

8. The cutting tool according to claim 1 , wherein the base body is a sintered body.

9. The cutting tool according to claim 1 , wherein at least a plurality of the recesses are continued in the front tool tip in the axial direction and a total cross-sectional area of the recesses in the front tool tip is less than a total cross-sectional area of the recesses in the rear clamping shaft.

10. The cutting tool according to claim 1 , wherein the outer shell and the support structure in the rear clamping shaft have a material cross-sectional area which corresponds approximately to the smallest material cross-sectional area of the base body in the cutting front tool tip.

Assignees

• Kennametal Inc

Inventors

• Ach Eduard
• Schwaegerl Juergen

Classifications

• Y10T408/907

  including detailed shank · CPC title

• Y10T408/455

  Conducting channel extending to end of Tool · CPC title

• B23P15/32

  twist-drills · CPC title

• B23C2222/28

  Details of hard metal, i.e. cemented carbide · CPC title

• B23B2251/62

  Drilling tools having means to reinforce the shank, e.g. drills having small shanks being gripped by devices having a larger shank · CPC title