Cutting tool and method for its manufacture

Patent metadata

Field	Value
Publication number	US-2018093330-A1
Application number	US-201615362384-A
Country	US
Kind code	A1
Filing date	Nov 28, 2016
Priority date	Nov 26, 2015
Publication date	Apr 5, 2018
Grant date	—

Abstract

A cutting tool ( 2 )—in particular a rotary tool—is described, having a cutting edge ( 4 ) from which a rake face ( 6 ) and a clearance face ( 8 ) extend, characterized in that a groove ( 12 ) is introduced into the clearance face ( 8 ) in a region along the cutting edge ( 4 ) so that a part of the clearance face ( 8 ) is formed as a wear face ( 14 ) that extends between the groove ( 12 ) and the cutting edge ( 4 ) and is bounded by the groove ( 12 ) and the cutting edge ( 4 ). The groove ( 12 ) advantageously limits the wear of the cutting tool ( 2 ) in the region of the cutting edge ( 4 ) on the wear surface ( 14 ), so that overall the frictional forces that occur are kept small and the service life of the cutting tool ( 2 ) is extended. Furthermore, a cutting element for a cutting tool ( 2 ) as well as a method for manufacturing the cutting tool ( 2 ) are described.

First claim

1 . A rotary cutting tool comprising:
a cutting edge, a rake face connected to the cutting edge, and a clearance face connected to the cutting edge, wherein the clearance face has a groove disposed in a region along the cutting edge so that the clearance face is formed as a wear surface that extends between the groove and the cutting edge and is bounded by the groove and the cutting edge.

2 . The cutting tool of claim 1 , wherein:
the rotary cutting tool is a drill; and the cutting edge is a main cutting edge formed on an end face of the drill.

3 . The cutting tool of claim 1 , wherein the wear surface, measured from the groove to the cutting edge, has a width between 0.1 mm and 0.3 mm.

4 . The cutting tool of claim 1 , wherein the groove has a groove depth that is between 0.05 mm and 0.1 mm.

5 . The cutting tool of claim 1 , wherein the groove has a groove width that is between 0.05 mm and 0.1 mm.

6 . The cutting tool of claim 1 , wherein the groove runs in a groove direction and, in cross section, has a curved contour transverse to the groove direction.

7 . The cutting tool of claim 1 , wherein the groove runs parallel to and at a constant distance from the cutting edge.

8 . The cutting tool of claim 1 , wherein the groove runs from an inner starting point to an outer end point and, with respect to the cutting edge, the groove is at a distance which expands toward the end point.

9 . The cutting tool of claim 1 further comprising:
a base body having a number of chip flutes; and
a core formed between the chip flutes, the core having a core diameter,
wherein the groove runs only along an outside of the core diameter.

10 . The cutting tool of claim 1 , wherein the cutting tool has a nominal radius, and the groove has a groove length that is at least 30% of the nominal radius.

11 . The cutting tool of claim 1 , wherein the cutting tool has an outer edge, and the groove is formed up to the outer edge.

12 . The cutting tool of claim 1 , wherein the cutting tool has an outer edge, and the groove extends only up to an end point that is within the clearance face and at a distance from the outer edge.

13 . The cutting tool of claim 1 , wherein the clearance face is provided with a coating.

14 . A cutting element for a rotary cutting tool, the cutting element comprising:
a cutting edge, a rake face connected to the cutting edge, and a clearance face connected to the cutting edge, wherein the clearance face has a groove disposed in a region along the cutting edge so that the clearance face is formed as a wear surface that extends between the groove and the cutting edge and is bounded by the groove and the cutting edge.

15 . A method for manufacturing a rotary cutting tool having a cutting edge, a rake face connected to the cutting edge, and a clearance face connected to the cutting edge, the method comprising:
forming a groove in the clearance face of the cutting tool at a distance from the cutting edge of the cutting tool so that part of the clearance face is formed as a wear face that extends between the groove and the cutting edge, the wear face being bounded by the groove and the cutting edge.

16 . The method of claim 15 , wherein the groove is formed by a laser.

Assignees

• Kennametal Inc

Inventors

• Guter Tim
• Kauper Herbert Rudolf

Classifications

• B23B51/02 Primary

  Twist drills · CPC title

• B23C2200/32

  Chip breaking or chip evacuation · CPC title

• B23B2251/408

  Spiral grooves · CPC title

• B24B3/26

  of the point of twist drills · CPC title

• B23C5/10

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