Method For Monitoring A Laser Machining Process Of A Laser Machine Tool
AssigneeGF Machining Solutions AG
InventorsFabrice JAQUES, David Conseil
Life of this patent
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Abstract
A method for monitoring a laser machining process of a laser machine tool, in particular engraving a texture or engraving a cavity, in which a laser source is provided and controlled by a laser-beam-control signal to emit a pulsed laser beam on the surface of the workpiece to ablate the material of the workpiece, wherein the interaction of the laser beam and the material of the workpiece generates a plasma.
Claims14
A method for monitoring a laser machining process for engraving a texture or engraving a cavity on a workpiece by a laser machine tool comprising wherein a laser source is provided and controlled by a laser-beam-control signal to emit a pulsed laser beam on the surface of the workpiece to ablate the material of the workpiece, wherein the interaction of the laser beam and the material of the workpiece generates a plasma by:
- a. detecting the light emission of the generated plasma and generating a plasma signal by a sensing device, in particular a photodiode, wherein an optical filter is provided in front of the photodiode to filter out the wavelength of the laser beam reflected from the surface of the workpiece;
- b. receiving the generated plasma signal and the laser-beam-control signal by a signal-processing unit, wherein the plasma signal is an electrical signal including a plurality of pulses;
- and
- c. determining a characteristic value from the pulses of the plasma signal by the signal-processing unit and mapping the determined characteristic value to an ablation position on the workpiece by combining the plasma signal and the laser-beam-control signal.
A system for monitoring the laser machining process for engraving a texture or engraving a cavity on a workpiece by a laser machine tool wherein a laser source is provided and controlled by a laser-beam-control signal to emit a pulsed laser beam on the surface of the workpiece to ablate the material of the workpiece, wherein the interaction of the laser beam and the material of the workpiece generates a plasma by:
- a. a sensing device configured to detect the light emission of the generated plasma and to generate a plasma signal, in particular the sensing device is a photodiode;
- b. an optical filter added on the sensing device to filter out the wavelength of the reflected laser beam;
- and
- c. a signal-processing unit configured to receive the plasma signal being an electrical signal including a plurality of pulses and a laser-beam-control signal and to determine a characteristic value from the pulses of the plasma signal and to map the determined characteristic value to an ablation position on the workpiece by combining the plasma signal and the laser-beam-control signal.
Dependencies are inferred from the claim text.