# US 2017/0282255 A1 · Cutting tool

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- Number: US 2017/0282255 A1
- Document ID: US20170282255A1
- Status: Published application
- Kind: A1
- Application number: 15/621,207
- Filed: 2017-06-13
- Published: 2017-10-05
- Earliest claimed: 2014-12-18
- Assignees: Hartmetall-Werkzeugfabrik Paul Horn GmbH
- Applicants: Hartmetall-Werkzeugfabrik Paul Horn GmbH
- Inventors: Matthias Luik; Daniel Herrmann
- Web page: https://patentgrep.com/patent/US20170282255A1

## CPC

- B23B 27/1666: {with plate-like cutting inserts clamped by a clamping member acting almost perpendicularly on chip-forming plane (B23B27/1677 takes precedence)}
- B23B 27/04: Cutting-off tools (B23B27/08 takes precedence {; toolholders for cutting-off inserts B23B29/043})
- B23B 27/08: Cutting tools with blade- or disc-like main parts {(with disc-like main parts B23B27/083)}
- B23B 29/043: {with cutting-off, grooving or profile cutting tools, i.e. blade- or disc-like main cutting parts (B23B29/14 takes precedence)}
- B23B 2205/02: Fixation using an elastically deformable clamping member
- B23B 2205/04: Fixation screws, bolts or pins of particular form
- B23B 2222/28: Details of hard metal, i.e. cemented carbide
- B23B 2222/84: Steel
- B23B 2260/056: Differential screw threads
- B23B 2260/146: Wedges
- B23B: TURNING; BORING (arrangements for copying or controlling B23Q)

## Abstract

Tool for machining a workpiece having a cutting insert with at least one cutting edge. Moreover, the tool has a tool holder, which extends along a holder longitudinal axis and has at a workpiece-side end a cutting insert receptacle for receiving the cutting insert, the cutting insert receptacle having an upper clamping finger and a lower clamping jaw. Furthermore, the tool has a wedge-shaped clamping element, which is fastenable in the cutting insert receptacle for wedging the cutting insert in the tool holder. In addition, the tool comprises a fastening element for fastening the clamping element in the cutting insert receptacle and for wedging the cutting insert in the tool holder.

## Claims

### Claim 1

A tool for machining a workpiece, comprising:
a cutting insert having at least one cutting edge;
a tool holder, which extends along a holder longitudinal axis and has at a work-piece-side end a cutting insert receptacle for receiving the cutting insert, the cutting insert receptacle having an upper clamping finger and a lower clamping jaw, and the tool holder having a first internal thread;
a wedge-shaped clamping element, which is fastenable in the cutting insert receptacle for wedging the cutting insert in the tool holder, wherein the clamping element has on a top side a first bearing portion for bearing against the cutting insert, which first bearing portion extends along a first bearing axis, and wherein the clamping element has a second bearing portion for bearing against the lower clamping jaw, which second bearing portion extends along a second bearing axis that runs transverse to the first bearing axis, and wherein the clamping element comprises a bore that extends parallel to the second bearing axis; and
a screw for fastening the clamping element in the cutting insert receptacle;
wherein, in the mounted state of the tool, the clamping element is disposed between the cutting insert and the lower clamping jaw of the tool holder, the second bearing axis runs parallel to the holder longitudinal axis, and the screw is screwed through the bore of the clamping element into the first internal thread of the tool holder.

### Claim 2 (depends on 1)

The tool as claimed in claim 1, wherein the clamping element, starting from a front end, extends along a longitudinal axis of the clamping element through to a rear end, wherein, in the mounted state of the tool, the longitudinal axis is oriented parallel to the holder longitudinal axis, and the rear end is facing a base of the cutting insert receptacle, and wherein the clamping element tapers in a wedge shape, in its height perpendicular to the longitudinal axis, through to the rear end.

### Claim 3 (depends on 1)

The tool as claimed in claim 1, wherein the first bearing axis and the second bearing axis are arranged at an angle (a) of less than 15° with respect to one another.

### Claim 4 (depends on 1)

The tool as claimed in claim 1, wherein the first bearing portion has a groove-shaped recess, which runs transversely to the first bearing axis and which divides the first bearing portion into two segments.

### Claim 5 (depends on 1)

The tool as claimed in claim 1, wherein each of the first and the second bearing portion has, viewed perpendicular to the longitudinal axis of the clamping element, a prismatic cross section.

### Claim 6 (depends on 1)

The tool as claimed in claim 1, wherein, in the mounted state of the tool, the screw is oriented parallel to the holder longitudinal axis.

### Claim 7 (depends on 1)

The tool as claimed in claim 1, wherein the screw has a first and a second external thread, wherein the first internal thread that is arranged in the tool holder corresponds with the first external thread, and wherein the clamping element has a second internal thread in the bore, which second internal thread corresponds with the second external thread.

### Claim 8 (depends on 7)

The tool as claimed in claim 7, wherein the first external thread is in opposite sense to the second external thread.

### Claim 9 (depends on 8)

The tool as claimed in claim 8, wherein the first and the second external thread have mutually different leads.

### Claim 10 (depends on 1)

The tool as claimed in claim 1, wherein the clamping element is made of steel, and the cutting insert is made of cemented carbide.

### Claim 11 (depends on 1)

The tool as claimed in claim 1, wherein the upper clamping finger and the lower clamping jaw are substantially rigid.

### Claim 12 (depends on 2)

The tool as claimed in claim 2, wherein an end face arranged at the front end of the clamping element is, in the mounted state of the tool, aligned with an end face that is arranged at the workpiece-side end of the lower clamping jaw.