Reamer

Patent metadata

Field	Value
Publication number	US-9895757-B2
Application number	US-201615171543-A
Country	US
Kind code	B2
Filing date	Jun 2, 2016
Priority date	Jun 5, 2015
Publication date	Feb 20, 2018
Grant date	Feb 20, 2018

Abstract

A reamer has a basic tool body made of hard metal ( 12 ) and a plate-like cutting insert ( 18 ) inserted into a recess ( 28 ) at the front. The cutting insert ( 18 ) is at least partially made of polycrystalline diamond, its cutting edges ( 20 ) situated axially offset relative to the cutting edges ( 30 ) on the basic tool body ( 12 ), thus engaging with the workpiece later.

First claim

The invention claimed is:

1. A reamer defining a longitudinal axis and comprising:
a basic tool body at least partially made of hard metal, the basic tool body having a clamping end and a front end opposite the clamping end that penetrates into the workpiece, the front end having a front side and hard metal cutting edges that protrude axially around a circumference of the front end, the front side having an axial recess into which a cutting insert at least partially made of polycrystalline diamond is inserted;
wherein the cutting insert hag has two opposing flat surfaces and a plurality of radially protruding diamond cutting edges;
wherein the hard metal cutting edges are arranged such that, in a cutting feed direction, cutting first starting from hard metal cutting edges at the front end, followed by the diamond cutting edges; and
wherein the hard metal cutting edges have a smaller cutting diameter than the diamond cutting edges.

2. The reamer according to claim 1 , wherein the hard metal cutting edges and the diamond cutting edges alternate circumferentially.

3. The reamer according to claim 1 , wherein the recess has a base surface that is perpendicular to the longitudinal axis of the reamer.

4. The reamer according to claim 1 , wherein the front end of the basic tool body has a plurality of axially protruding fingers on which the hard metal cutting edges are formed.

5. The reamer according to claim 1 , wherein the cutting insert has a polygonal design with radially outer points on which the diamond cutting edges are formed.

6. The reamer according to claim 1 , wherein the cutting insert is brazed to the basic tool body.

7. The reamer according to claim 1 , wherein the cutting insert is a composite component having a front layer of polycrystalline diamond and an adjacent hard metal carrier layer.

8. The reamer according to claim 1 , wherein the cutting insert has at least two diamond cutting edges.

9. The reamer according to claim 1 , wherein the difference in diameter between the diameters on which the hard metal cutting edges and the diamond cutting edges are situated is less than 1/10 mm.

10. The reamer according to claim 1 , wherein the cutting insert is arranged with the flat surfaces being perpendicular to the longitudinal axis of the reamer.

11. The reamer according to claim 3 , wherein the cutting insert is arranged with the flat surfaces being perpendicular to the longitudinal axis of the reamer.

12. The reamer according to claim 8 , wherein the diamond cutting edges are evenly distributed around a circumference of the cutting insert.

Assignees

• Kennametal Inc
• Kennametal Inc

Inventors

• Hacker Michael
• Kunschir Sebastian
• Zimmermann Armin
• Spichtinger Xaver
• Lang Wolfgang
• Goetz Michaela
• Manner Heinrich

Classifications

• Y10T408/89

  Tool or Tool with support · CPC title

• B23D2277/34

  comprising cutting inserts made from different materials · CPC title

• B23D2277/2464

  Hard metal, i.e. cemented carbide · CPC title

• B23D77/025

  Securing arrangements for cutting inserts · CPC title

• B23D77/02 Primary

  Reamers with inserted cutting edges · CPC title