Method for closed-loop controlling a laser processing operation and laser material processing head using the same

US9355441B2 · kind B2 · utility

Assignees

• Precitec GmbH & Co. KG · DE
• PRECITEC ITM GMBH · DE

Inventors

• Ingo Stork Genannt Wersborg · Munich, DE
• Thibault Bautze · Karlsruhe, DE

Key dates

• Filing date: Jun 28, 2011
• Grant date: May 31, 2016
• Expiry date: Mar 13, 2033

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P90/02
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

The present invention relates to a method for closed-loop controlling a processing operation of a workpiece, comprising the steps of: (a) recording a pixel image at an initial time point of an interaction zone by means of a camera, wherein the workpiece is processed using an actuator having an initial actuator value; (b) converting the pixel image into a pixel vector; (c) representing the pixel vector by a sum of predetermined pixel mappings each multiplied by a corresponding feature value; (d) classifying the set of feature values on the basis of learned feature values into at least two classes of a group of classes comprising a first class of a too high actuator value, a second class of a sufficient actuator value and a third class of a too low actuator value at the initial time point; (e) performing a control step for adapting the actuator value by minimizing the error et between a quality indicator ye and a desired value; and (f) repeating the steps (a) to (e) for further time points to perform a closed-loop controlled processing operation.