Reamer

Patent metadata

Field	Value
Publication number	US-2016354849-A1
Application number	US-201615171543-A
Country	US
Kind code	A1
Filing date	Jun 2, 2016
Priority date	Jun 5, 2015
Publication date	Dec 8, 2016
Grant date	—

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

1 . A reamer having a basic tool body at least partially made of hard metal that has a clamping end and a front end opposite the clamping end that penetrates into the workpiece, said front end having a front side and hard metal cutting edges that protrude axially around the circumference, the front side having an axial recess into which a plate-like cutting insert at least partially made of polycrystalline diamond is inserted, said cutting insert having a plurality of radially protruding diamond cutting edges, the hard metal cutting edges cutting first starting from the front end, followed by the diamond cutting edges, and the hard metal cutting edges being situated on a smaller diameter than the diamond cutting edges.

2 . A reamer according to claim 1 , wherein the hard metal cutting edges and the diamond cutting edges alternate circumferentially. However, a ratio other than 1:1 is possible between the two types of cutting edges, such as 2:3 or 1:2.

3 . A reamer according to claim 1 , wherein the recess has a base surface that is perpendicular to the longitudinal axis of the reamer and/or the cutting insert is arranged with its flat surfaces perpendicular to the longitudinal axis of the reamer.

4 . A reamer according to claim 1 , wherein the front end of the basic tool body is crown-shaped and the hard metal cutting edges are on the points of the crown.

5 . A reamer according to claim 1 , wherein the cutting insert has a star-shaped design with points on which the diamond cutting edges are formed.

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

7 . A 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 . A reamer according to claim 1 , wherein the cutting insert has at least two diamond cutting edges, which are preferably evenly distributed around the circumference.

9 . A 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.

Assignees

• Kennametal Inc

Inventors

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

Classifications

• B23D77/12 Primary

  Reamers with cutting edges arranged in tapered form · CPC title

• Y10T408/89

  Tool or Tool with support · CPC title

• B23D2277/44

  comprising chip grooves, i.e. flutes, of special form · CPC title

• B23D2277/245

  polycrystalline [PCD] · CPC title

• B23D2277/02

  Cutting head and shank made from two different components which are releasably or non-releasably attached to each other · CPC title