# US 12,594,624 B2 · Machining apparatus for laser machining a workpiece, method for laser machining a workpiece

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- Number: US 12,594,624 B2
- Document ID: US12594624B2
- Status: Granted
- Kind: B2
- Application number: 17/642,065
- Filed: 2020-09-17
- Published: 2022-12-01
- Granted: 2026-04-07
- Earliest claimed: 2019-09-18
- Assignees: Bystronic Laser AG
- Applicants: Bystronic Laser AG
- Inventors: Colin Woratz
- Web page: https://patentgrep.com/patent/US12594624B2

## CPC

- B23K 26/0676: {into dependently operating sub-beams, e.g. an array of spots with fixed spatial relationship or for performing simultaneously identical operations}
- B23K 26/0608: {in the same heat affected zone [HAZ] (B23K26/0613, B23K26/0619 take precedence)}
- B23K 26/073: Shaping the laser spot
- B23K 26/38: by boring or cutting
- G02B 6/03622: {having 2 layers only}
- G02B 6/4296: {coupling with sources of high radiant energy, e.g. high power lasers, high temperature light sources}
- B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

A machining apparatus for laser machining a work-piece, in particular for laser cutting, is provided, having a device for generating a machining laser beam, for rough machining the work-piece, in particular for producing cuts with cut edges in the workpiece, and having a device for splitting the machining laser beam into at least two energy intensity ranges, wherein a first energy intensity range for rough machining of the workpiece has a greater time-integrated radiation energy than at least one second energy intensity range for at least partially fine machining a cut edge. Further provided is a method a for laser machining a workpiece.

## Claims

### Claim 1

A machining apparatus for laser cutting a workpiece, the machining apparatus comprising:
a device for generating a machining laser beam, for rough machining the workpiece and for producing cuts with cut edges in the workpiece;
a device for splitting the machining laser beam into at least two energy intensity ranges including a first energy intensity range and at least one second energy intensity range, wherein the first energy intensity range is for rough machining of the workpiece and has a greater time-integrated radiation energy than the at least one second energy intensity range for at least partially fine machining a cut edge;
wherein:
the device for splitting the machining laser beam is configured to adjust or select the at least two energy intensity ranges independently of each other,
the first energy intensity range is a core region of the machining laser beam and the at least one second energy intensity range is at least one edge region of the machining laser beam,
the first energy intensity range and the at least one second energy intensity range are arranged concentrically, and
the energy intensity ranges are adapted for rough and fine machining by the device for splitting the machining laser beam, and
a control unit,
wherein at least one of the device for splitting the machining laser beam and the device for generating a machining laser beam is connected to the control unit in a wired or wireless data-carrying manner and is controllable with the control unit,
wherein the device for splitting the machining laser beam is configured to modify a geometry of the cut edge,
wherein
the device for generating the machining laser beam includes a machining laser source that has a plurality of laser source modules including at least one first laser source module and at least one second laser source module for generating the energy intensity ranges of the machining laser beam; and
the device for splitting the machining laser beam includes a laser beam transport fibre having a first fibre region which is a fibre core, and at least one second fibre region in a form of a fibre jacket ring;
wherein
the at least one first laser source module is configured for generating the first energy intensity range of the machining laser beam and is coupled to the first fibre region of the laser beam transport fibre in a laser light-conducting manner; and
the at least one second laser source module is configured for generating one of the at least one second energy intensity ranges of the machining laser beam and is coupled to each of the further fibre regions assigned thereto in a laser light-conducting manner.

### Claim 2 (depends on 1)

The machining apparatus according to claim 1, wherein
the device for generating the machining laser beam comprises a machining laser source and a laser beam transport fibre; and
the device for splitting the machining laser beam includes an optical element for shaping the beam of the machining laser beam.

### Claim 3 (depends on 1)

The machining apparatus according to claim 1,
wherein the device for splitting the machining laser beam is configured to adjust or select the time-integrated radiation energy of the at least one second energy intensity range with increasing distance from the first energy intensity range;
and/or
wherein the device for splitting the machining laser beam is configured to round or chamfer the cut edge.

### Claim 4 (depends on 1)

The machining apparatus according to claim 1,
wherein the device for splitting the machining laser beam is configured to adjust or select at least one of:
at least one or a plurality of powers of the machining laser source or the laser source modules,
an intensity distribution perpendicular to a direction of propagation of the machining laser beam,
one or a plurality of frequencies of the machining laser beam and/or at least one of the energy intensity ranges of the machining laser beam,
a spatial structure of the machining laser beam, the spatial structure including a width and/or a diameter of the machining laser beam,
a spatial structure and/or arrangement of the first energy intensity range and/or the at least one second energy intensity range,
a feed rate of the machining laser beam, a focus diameter of the machining laser beam and/or of at least one of the energy intensity ranges,
a focal position of the machining laser beam and/or of at least one of the energy intensity ranges, and
a focusing of the machining laser beam and/or of at least one of the energy intensity ranges.

### Claim 5 (depends on 1)

The machining apparatus according to claim 1,
further comprising a device for guiding a machining gas the machining gas comprising a cutting gas, onto the workpiece; and/or
wherein the device for guiding the machining gas onto the workpiece comprises a nozzle-shaped outlet with an opening for the machining gas, the opening having a diameter in a range of 0.5 to 30 mm, wherein the nozzle-shaped outlet opening is adjustable in a distance from the workpiece to the cut edge in a range from 0 to 3 mm.

### Claim 6 (depends on 1)

The machining apparatus according to claim 1, wherein the device for splitting the machining laser beam is configured to at least partially fine machine the cut edge of the workpiece.