Method of manufacturing a cutting tool and a cutting tool

Patent metadata

Field	Value
Publication number	US-2016016232-A1
Application number	US-201514724841-A
Country	US
Kind code	A1
Filing date	May 29, 2015
Priority date	Jun 3, 2014
Publication date	Jan 21, 2016
Grant date	—

Abstract

The disclosure relates to a method of manufacturing a cutting tool including the steps of: providing a cutting tool blank including a cutting edge, defined by a cross-sectional wedge angle (β). The wedge angle has a variation along the cutting edge, and material is removed from the cutting edge with a constant material removal rate per length unit of the edge, such as to form a corresponding variation of edge rounding along the cutting edge. The disclosure further relates to a cutting tool including the cutting edge defined by the cross-sectional wedge angle having a variation along the cutting edge and wherein the cutting edge has a corresponding variation of edge rounding along the cutting edge.

First claim

1 . A method of manufacturing a cutting tool, comprising the steps of:
providing a cutting tool blank comprising a cutting edge, defined by a cross-sectional wedge angle, wherein the wedge angle has a variation along the cutting edge; and removing material from the cutting edge, with a constant material removal rate per length unit of the edge, such as to form a corresponding variation of edge rounding along the cutting edge.

2 . The method according to claim 0 , wherein material is removed by wet blasting, dry blasting, brushing, electro discharge machining or laser processing.

3 . The method according to claim 1 , wherein the constant material removal rate is within the range of 100-600 μm 2 per length unit of the edge per unit of time, preferably within the range of 200-500 μm 2 per length unit of the edge per unit of time, more preferably within the range of 300-400 μm 2 per length unit of the edge per unit of time.

4 . The method according to claim 1 , wherein the resulting edge rounding has a radius within the range of 10-70 μm, preferably within the range of 15-45 μm, more preferably within the range of 20-40 μm.

5 . The method according to claim 1 , wherein the wedge angle is formed on the cutting tool blank by grinding a sintered body, or formed during molding of a cutting tool green body before sintering.

6 . The method according to claim 1 , further comprising the step of applying a hard coating to the cutting tool blank after the step of removing material from the cutting edge.

7 . A cutting tool comprising a cutting edge, wherein the cutting edge is defined by a cross-sectional wedge angle having a variation along the cutting edge and wherein the cutting edge has a corresponding variation of edge rounding along the cutting edge.

8 . A cutting tool comprising a cutting edge, wherein the cutting edge is defined by a cross-sectional wedge angle having a variation along the cutting edge and wherein the cutting edge has a corresponding variation of edge rounding along the cutting edge, obtained by the method according to claim 0 .

9 . The cutting tool according to claim 0 , wherein the cutting tool is a turning tool or a drilling tool, or a cutting insert for turning or drilling.

10 . The cutting tool according to claim 0 , wherein the cutting edge is formed by a wedge-shaped cross-section with a wedge angle having a variation along the cutting edge.

11 . The cutting tool according to claim 0 , wherein the wedge angle is within the range of 60 to 100 degrees, preferably within the range of 70 to 90 degrees, along the cutting edge.

12 . The cutting tool according to claim 0 , wherein the variation of the wedge angle along the cutting edge is within the range of 5-35 degrees, preferably within the range of 10-30 degrees, more preferably within the range of 15-25 degrees, or within the range of 10-20 degrees, along the cutting edge.

13 . The cutting tool according to claim 0 , wherein the variation of the wedge angle is obtained by a variation of the clearance angle along the cutting edge.

14 . The cutting tool according to claim 0 , wherein the variation of the wedge angle (β) is continuous along the cutting edge.

15 . The cutting tool according to claim 0 , wherein the cutting tool has a nose and a leading edge and/or a trailing edge and wherein the wedge angle is smaller at the nose than at the leading edge and/or the trailing edge, whereby the edge rounding has a smaller radius at the nose than at the leading edge and/or the trailing edge.

16 . The cutting tool according to claim 0 , wherein the wedge angle is gradually expanded from the tip of the nose towards the leading edge and/or trailing edge, whereby the edge radius is gradually increasing from the tip of the nose towards the leading edge and/or trailing edge.

17 . The cutting tool according to claim 0 , wherein the cutting tool blank is a sintered cemented carbide body or a cubic boron nitride body.

18 . A method of using a cutting tool to machine stainless steel or titanium alloy, the cutting tool comprising a cutting edge, wherein the cutting edge is defined by a cross-sectional wedge (β) angle having a variation along the cutting edge and wherein the cutting edge has a corresponding variation of edge rounding along the cutting edge.

Assignees

• Sandvik Intellectual Property

Inventors

• Edman Jonny
• Zarif Yussefian Nima

Classifications

• B23B2200/202

  with curved cutting edge · CPC title

• B23P15/32

  twist-drills · CPC title

• B23B27/145 Primary

  characterised by having a special shape · CPC title

• B23B2200/0452

  rounded · CPC title

• B23B2226/125

  cubic [CBN] · CPC title