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Beam-forming unit for focusing a laser beam and control method therefor

A beam forming and laser technology, applied in optical components, laser welding equipment, optics, etc., can solve problems such as difficulty in movement and complex structure of beam guidance systems

Active Publication Date: 2015-02-11
TRUMPF WERKZEUGMASCHINEN GMBH & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Said requirements result in a complex construction of the beam guidance system
Furthermore, the resulting gas pressure in the focusing optics facing away from the optics chamber makes corresponding movements difficult

Method used

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  • Beam-forming unit for focusing a laser beam and control method therefor
  • Beam-forming unit for focusing a laser beam and control method therefor

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Experimental program
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Embodiment Construction

[0028] exist Figure 1a shows a beam shaping unit 1 in which a laser beam 3 is divergently impinged on a first lens 5 with a short focal length (typically less than about 50 mm, especially in the range of about 30 mm) and An image is formed via an intermediate focal point 6 onto a second lens 7 (with beam diameter D1). Laser beam 3 collimated by second lens 7 is focused via a (fixed) further lens serving as focusing optics 8 onto workpiece surface 9 for laser material processing. The laser focus formed on the workpiece surface 9 at the working point has a diameter d1 here.

[0029] When changing applications, for example when switching to another plate thickness or another workpiece (plate) to be cut, it may be necessary to change the focal diameter d1 on the workpiece surface 9 and to select a smaller focal diameter d2 (<d1), for example.

[0030] In order to variably adjust the focus diameter, a first focus adjustment device 10 is arranged on the beam shaping unit 1 , which...

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PUM

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Abstract

A beam shaping unit for focusing a divergent laser beam includes a first optical element to receive the laser beam, a second optical element to receive the beam from the first optical element, an optical focusing unit to receive the beam from the second optical element, a first focal point adjustment device coupled to the first optical element, the first focal point adjustment device being configured to adjust the beam focal point diameter by manipulating the first optical element, and a second focal point adjustment device coupled to the second optical element, the second focal point adjustment device being configured to adjust, in the beam propagation direction, the beam focal position by manipulating the second optical element, and in which the beam shaping unit is configured to image the beam from the first optical element through an intermediate focal point onto the second optical element.

Description

technical field [0001] The invention relates to a beam shaping unit for focusing a laser beam for laser material processing onto a workpiece and to a method for controlling the beam shaping unit. Background technique [0002] In laser material processing, the laser beam must always be repeatedly adapted for different processes and applications. In addition to setting the correspondingly required power level, in particular the focal diameter and the focal point position of the laser beam also play an important role. In many cases, for example in the case of laser cutting when changing thin plates to thick plates or vice versa, the adaptation requires a change of the processing optics and possibly even of the entire processing head. The associated set-up times reduce the productivity of the laser processing system used. [0003] In order to adjust different focus diameters at the working point with the smallest beam diameter of the laser beam, a device and a method are known...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K26/14B23K26/073
CPCB23K26/046G02B15/14B23K26/38B23K26/14G02B27/09G02B7/08B23K26/073G02B27/0961G02B15/143
Inventor T·鲁普J·布劳恩D·韦埃斯J-M·魏克D·布格尔
Owner TRUMPF WERKZEUGMASCHINEN GMBH & CO KG