Cutting tool with enhanced chip evacuation capability and method of making same

Patent metadata

Field	Value
Publication number	US-9724768-B2
Application number	US-201414277115-A
Country	US
Kind code	B2
Filing date	May 14, 2014
Priority date	Apr 10, 2014
Publication date	Aug 8, 2017
Grant date	Aug 8, 2017

Abstract

A milling cutter includes a shank and a cutting head attached to the shank. The cutting head has a plurality of helical teeth, each tooth including a cutting tip, a leading face and a rear face. A flute is defined between the leading face of a trailing tooth, and a rear face of an immediately preceding tooth. A gully of the flute is generally W-shaped in cross section to provide effective chip evacuation. A method for manufacturing the milling cutter with the W-shaped gully of the flute using a split path grinding process is also disclosed.

First claim

What is claimed is:

1. A milling cutter, comprising:
a shank;
a cutting head attached to the shank, the cutting head having a plurality of helical teeth, each tooth including a cutting tip, a leading face and a rear face; and
a flute defined between the leading face of a trailing tooth, and a rear face of an immediately preceding tooth,
wherein a gully of the flute is W-shaped in cross section to provide additional volume for effective chip evacuation,
wherein each tooth further comprises a planar primary relief rake facet which extends entirely between the leading face and the rear face and connects directly with both the leading face and the rear face.

2. The milling cutter of claim 1 , wherein the gully comprises two flute bases separated by a ridge.

3. The milling cutter of claim 1 , wherein the leading face has a positive or negative radial rake angle.

4. The milling cutter of claim 3 , wherein the leading face has a radial rake angle of between about −15 degrees and about +15 degrees.

5. The milling cutter of claim 1 , wherein the primary relief rake facet has a primary clearance angle of 5-10 degrees.

6. The milling cutter of claim 5 , wherein a wedge angle of each tooth is between 60-90 degrees.

7. The milling cutter of claim 1 having between 5 and 50 teeth.

8. The milling cutter of claim 1 , wherein a wedge angle of each tooth is between 60-90 degrees.

9. The milling cutter of claim 1 having a cutting diameter between 10 mm and 25 mm.

Assignees

• Kennametal Inc
• Kennametal Inc

Inventors

• Sharivker Leonid Boris
• Boulakhov Sergei Vladimir

Classifications

• B21H3/10

  twist-drills; screw-taps · CPC title

• B24B3/021

  of milling cutters with helical cutting edges · CPC title

• B23C2210/282

  Unequal angles between the cutting edges, i.e. cutting edges unequally spaced in the circumferential direction · CPC title

• B23P15/32

  twist-drills · CPC title

• B21K5/04

  twisting-tools, e.g. drills, reamers · CPC title