Method for determining focal position and method for determining the position of a laser beam relative to an opening, and laser machining nozzle
A technology of laser processing and focus position, which is applied in the field of determining the focus position and the position of the laser beam relative to the hole and the laser processing nozzle, which can solve the problems of inaccurate results and inaccuracy
Inactive Publication Date: 2010-08-25
TRUMPF WERKZEUGMASCHINEN GMBH & CO KG
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But this method can lead to inaccurate results if the laser beam is initially very off-centre, since in this case the circular cut has very beveled edges and produces inaccurate results when probing with a laser machining nozzle
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[0047] FIG. 1 a shows a laser beam 1 which is deflected by first and second deflection mirrors 3 , 4 and focused onto a focal point F by means of a focusing lens 5 in a laser processing head 2 of a (not shown) laser processing machine. An adaptively configured second deflection mirror 4 can additionally be used to focus the laser beam 1, that is to say, the rear side of the second deflection mirror is impinged with water so that a change in the water pressure changes the radius of curvature of the second deflection mirror and is determined by This changes the position of the focal point F along the laser beam axis (Z direction).
[0048] The focused laser beam 1 passes through the opening 6 of the nozzle body 7 of the laser processing nozzle 8 mounted on the laser processing head 2 and falls onto a sheet-metal-shaped plate-like object 9 placed below the nozzle body 7 . The laser machining head 2 is moved continuously in the X direction (ie transversely to the laser beam axis Z...
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Abstract
The invention relates to a method for determining a reference focal position (FL) of a focused laser beam relative to a platelike body (9), preferably a metal sheet, the laser beam passing through an opening (6) in a nozzle body (7) of a laser machining nozzle (8), having the following steps: a) cutting off a piece (11) of the body (9) by means of the laser beam (1), along with a simultaneous, preferably stepwise alteration of the distance between the focal point (F) of the laser beam (1) and the platelike body (9) in the direction of the laser beam axis (Z), and b) touching an edge (12), from the side, formed by the cutting off of the piece (11), to detect the coordinates of the edge (12), and c) determination of a section (12a) of the edge (12) projecting the most, using the detected coordinates, and determination of the associated setting of the distance between the focal point (F) of the laser beam (1). The invention also relates to a method for determining the position of a laser beam (1) passing through an opening (6) of a nozzle body (7) of a laser machining nozzle (8) relative to the opening (6), in at least one first spatial direction (X), preferably perpendicular to the laser beam axis (Z). The invention also relates to a laser machining nozzle (8) for use in the method described above.
Description
technical field [0001] The invention relates to a method for determining the reference focus position of a focused laser beam exiting through an aperture in a nozzle body of a laser processing nozzle relative to a plate-like object, preferably a metal sheet, and a method for determining Method of processing the position of the laser beam emerging from the hole in the nozzle body of the nozzle relative to the hole in at least one first spatial direction, preferably perpendicular to the axis of the laser beam. The invention also relates to a laser machining nozzle for use in such a method, the laser machining nozzle having a nozzle body and a hole formed in the nozzle body. Background technique [0002] For the laser processing of workpieces it is necessary to know very precisely the focal position of the laser beam relative to the workpiece surface. Therefore, a focus setting is usually sought in the calibration step in which the focus of the laser beam lies on the workpiece...
Claims
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IPC IPC(8): B23K26/04B23K26/38
CPCB23K26/046B23K26/38
Inventor U·米恩哈尔特
Owner TRUMPF WERKZEUGMASCHINEN GMBH & CO KG