Method and device for adjusting the focus position of a working laser beam and laser processing head having said device
A focus position and laser technology, applied in laser welding equipment, metal processing equipment, manufacturing tools, etc., can solve the problems of non-existence of standardized communication channels and impossibility of laser processing heads
Active Publication Date: 2021-08-10
PRECITEC GMBH
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Problems solved by technology
The advantage of a backlash-free translation of the movement is traded for the disadvantage that there is no mechanical type of stop to hold the optics and thus the working focus in the desired position in the event of externally acting accelerations
[0010] A prerequisite for this type of pre-control is to see the future of the movement, which is not a problem in the case of modern NC systems, but is not possible with autonomously operating laser processing heads, since there is no standardized communication for this information aisle
Method used
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Embodiment Construction
[0024] as in figure 1 As shown schematically in , the laser machining head 10 has a housing 12 through which a working laser beam path for a working laser beam 14 is guided. The working laser beam 14 is fed to the laser processing head 10 via a corresponding optical fiber 16 . The laser processing head 10 with its housing 12 is mounted, for example, on the hand 18 of an industrial robot 15 (not shown), so that it can be guided by the industrial robot in the x, y and z directions relative to the workpiece 20 .
[0025] In order to be able to adjust the orientation or position of the focal point 22 of the working laser beam 14 relative to the housing 12 , the optics 24 is arranged displaceably in the direction of its optical axis 26 .
[0026] To displace optics 24 - the optics are in figure 1 shown schematically as a single lens, but can also be configured as a lens system and arranged on a not shown carriage or the like—a servomotor 28 is provided in the direction of the opt...
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The invention relates to a method and a device for adjusting the focus position of a working laser beam (14) for processing a workpiece (20) as well as a laser processing head (10) equipped with said device, wherein by means of A servomotor (28) displaces the optics (24) along an optical axis (26) of the optics (24) to adjust the focus position of the working laser beam (14). The method comprises the steps of generating and outputting a presetting of a current control loop (40) of the servomotor (28) by means of a position controller (38) in order to move the optics (24) into a desired position and remain there; detect the acceleration acting in the direction of the optical axis of the optical device by means of an acceleration sensor (48); change the output, the The current control loop (40) of the servomotor (28) is preset so that the servomotor (28) generates an additional force counteracting the force produced by the detected acceleration.
Description
technical field [0001] The invention relates to a method and a device for adjusting the focus position of a working laser beam for processing a workpiece, as well as a laser processing head with the device. [0002] In the case of laser material processing, it is often necessary to adapt the focus position of the working laser beam to the respective processing situation. One possibility for this purpose is that one or more lenses of the optics in the laser processing head are internally controlled or regulated electromechanically exercise. Background technique [0003] DE 10 2014 101 477 A1 shows a laser processing head for processing workpieces with the aid of a laser beam, in which beam-shaping optics are displaceable in the longitudinal direction of the laser beam supported on the holding device. For displacing the optics, a belt drive is provided which is driven by a motor, in particular a brushless DC motor or a stepper motor, in order to move the optics to the desir...
Claims
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IPC IPC(8): G02B7/28G02B26/00B23K26/04B23K26/046B23K26/064
CPCB23K26/04B23K26/046B23K26/06B23K26/0665
Inventor G·施珀尔M·蒂埃尔
Owner PRECITEC GMBH