Patent DE-102012111797-A1 (DE)
Title: Device, useful for processing workpiece, comprises holder in which workpiece is clamped, laser device emitting first laser beam on to jet of water, drive unit, and control unit, where laser device is positioned at different positions
Inventor: CALIEBE REINHARD
IPC: B23K26/02
Filed: 2012-12-05
Abstract: The processing device comprises a holder (1) in which a workpiece (2) is clamped, a first laser device for emitting a first laser beam on to a jet of water, a drive unit (6) for positioning the first laser device relative to the workpiece holder in the jet of water in an orthogonal plane, and a control unit (7). A workpiece material is erodable by the first laser beam. The drive unit is positioned at different positions. The control unit controls the first laser device so that the first laser device emits the first laser beam on to the workpiece holder. The processing device comprises a holder (1) in which a workpiece (2) is clamped, a first laser device for emitting a first laser beam on to a jet of water, a drive unit (6) for positioning the first laser device relative to the workpiece holder in the jet of water in an orthogonal plane, and a control unit (7). A workpiece material is erodable by the first laser beam. The drive unit is positioned at different positions. The control unit controls the first laser device so that the first laser device emits the first laser beam on to the workpiece holder. Acoustic and/or mechanical vibrations are generated in a beam length influencing device at respective positions during emission of the first laser beam. The beam length influencing device has an operating frequency when the water jet subjected to a vibration. A beam length of the water jet is large as a respective first machining depth. The first laser device is operates at the working frequency. The control unit controls the beam length influencing device. The first laser device is coordinated such that pulse times during emission of the first laser beam have a defined fixed or adjustable phase position in relation to the acoustic or mechanical vibration of the beam length influencing device. The workpiece has an initial contour before processing. The initial contour is set by the control unit. The processing device further comprises a first measuring unit, a second measuring unit, a processing tool for re-processing the workpiece, and a post-processing tool. The initial contour corresponds to activation of the first measuring device. The control unit has a speed, by which the control device moves the first laser device or a dwell time during which the first laser device stops at the respective position. The speed or dwell time is dynamically determined depending on the initial contour. The first laser beam has a first wavelength of 355-1070 nm based on a vacuum. The control unit determines a first processing depth for the respective position based on a signal related to the direction of the water jet, a distance of the first laser device from the workpiece holder, and a predetermined target contour of the workpiece. The respective position is determined such that an intermediate contour obtained by the laser device is greater than the target contour. The control device determines a respective second working depth for positions of the workpiece on the basis of deviation of the intermediate configuration of the desired contour. The post-processing tool is connected to the first laser device. The beam length of the water jet extends to the target contour. The post-processing tool is formed as the second laser device that emits second laser beam in air. The control unit drives the first and second laser device such that material at the respective first and second working depths is removed at the respective position of the workpiece. The second laser beam has a second wavelength of 355-1070 nm relative to vacuum. The workpiece is stretched between the processing tool and the workpiece holder after processing.