Cutting tool having liquid-spraying nozzles for controlling chip formation
AssigneeSandvik Aktiebolag
InventorStig Lagerberg
Life of this patent
Estimating the term…
Abstract
A metal workpiece is cut by rotating the workpiece while pressing the cutting edge of a cutting insert thereagainst for removing a chip from the workpiece. A first liquid jet is directed from a first nozzle toward an upper surface of the cutting insert for creating an hydraulic wedge between the cutting insert and the chip, and a second liquid jet is directed from a second nozzle toward a target point disposed above the upper surface of the cutting insert to engage and deflect the chip upwards and backwards.
Claims11
A cutting tool comprising:
- a front body part forming a seat adapted to receive a cutting insert;
- a rear body part adapted to be detachably secured in a holder;
- and
- a plurality of liquid nozzles disposed rearwardly of the seat for emitting liquid jets at a pressure greater than 100 bar, a first of the nozzles arranged to direct its liquid jet toward a first target point for creating a hydraulic wedge between a cutting insert and a chip formed by the cutting insert, and a second of the nozzles arranged to direct its liquid jet toward a second target point disposed above the first target point for deflecting the chip upwards and backwards.
A metal cutting apparatus comprising:
- a clamping unit including a cavity and a first liquid duct intersecting an interior surface of the cavity;
- and
- a cutting tool including:
- a rear body part mounted in the cavity,
- a front body part forming an insert seat in which a cutting insert is mounted,
- an intermediate body part disposed between the front and rear body parts,
- a pair of first and second liquid nozzles mounted in the intermediate body part for emitting respective liquid jets at a pressure greater than 100 bar, the first nozzle arranged to direct its liquid jet toward a first target point disposed on an upper surface of the cutting insert for creating an hydraulic wedge between the cutting insert and a chip formed thereby, the second nozzle arranged to direct its liquid jet toward a second target point disposed above the first target point for deflecting the chip upwards and rearwards, and
- a second liquid duct aligned with the first liquid duct and communicating with the nozzles for transmitting high-pressure liquid to the nozzles.
A method of cutting a metal workpiece using a cutting insert, comprising the steps of:
- A. rotating the workpiece with a cutting edge of the cutting insert pushed thereagainst for removing a chip from the workpiece;
- B. directing a first liquid jet from a first nozzle toward an upper surface of the cutting insert for creating an hydraulic wedge between the cutting insert and the chip, during step A;
- and
- C. directing a second liquid jet from a second nozzle toward a target point disposed above the upper surface of the cutting insert to engage and deflect the chip upwards and backwards, during steps A and B.
Dependencies are inferred from the claim text.