TRUMPF Laser und Systemtechnik GmbH

Ditzingen, Germany

TRUMPF Laser und Systemtechnik GmbH

Ditzingen, Germany
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Patent
TRUMPF Laser und Systemtechnik GmbH and Trumpf Sisma S.r.l. | Date: 2017-02-08

A method for radiation based additive manufacturing of a three-dimensional object (1) from powdered material (27) is disclosed, wherein a plurality of layers (N-1, N, N+1, N+2) of the powdered material (27) are provided in a layer providing direction (Z) and are irradiated layer by layer, and the plurality of layers (N-1, N, N+1, N+2) comprises an overhang layer (N, N+1, N+2) with a core region (9) and a down-skin region (11) for forming a core portion (3) and an overhang portion (5) of the manufactured three-dimensional object (1), respectively, the core region (9) extending in the layer providing direction (Z) on top of an irradiated region of a directly preceding layer (N-1, N, N+1) and the down-skin region (11) extending on top of a previously nonirradiated region of the directly preceding layer (N-1, N, N+1). The method comprises generating the directly preceding layer (N-1, N, N+1) of the overhang layer (N, N+1, N+2), and generating the overhang layer (N, N+1, N+2) by providing a core energy density into the core region (9) at least up to a preset distance from a transition (7) to the down-skin region (11), and providing a slope depending overhang energy density into down-skin micro-regions (69) of the down-skin region (11), wherein the slope depending overhang energy density differs from the core energy density by a down-skin reduction that depends on an extent (15) of the respective down-skin micro-region beyond the respective core region (9) of the directly preceding layer (N-1, N, N+1).


Patent
TRUMPF Laser und Systemtechnik GmbH | Date: 2017-02-13

Methods, machines, and computer-readable mediums for determining distance correction values of a desired distance between a laser processing nozzle on a laser processing head and a workpiece during laser processing of the workpiece are provided. In some implementations, the workpiece is scanned along a desired path of a surface of the workpiece separately by the laser processing nozzle and a measurement head arranged in place of the laser processing nozzle on the laser processing head, with a capacitively measured distance identical to the desired distance. The measurement head has a lower lateral sensitivity of a capacitance measurement than the laser processing nozzle. Respective scanned movement paths of the laser processing nozzle and the measurement head are determined. The distance correction values for the desired distance of the laser processing nozzle are then determined from the scanned movement paths determined with the laser processing nozzle and the measurement head.


The invention relates to a method for determining distance correction values (A) for the desired distance between a laser machining nozzle (8) arranged on a laser machining head (3) and a workpiece (6) during the laser machining of said workpiece (6), in which method, during the laser machining process the distance (A) of the laser machining nozzle (8), which is moved along a desired movement path, from the workpiece (6) is measured capacitively and controlled to the corrected desired distance. In said method, according to the invention the workpiece (6) is scanned both by means of the laser machining nozzle (8) and by means of a measuring head (11) arranged on the laser machining head (3) in place of the laser machining nozzle (8), said measuring head having a lower lateral sensitivity of capacitance measurement than the laser machining nozzle (8), each scan being carried out with a pre-set desired distance and the scanning movement path of the laser machining nozzle (8) is thus determined. The distance correction values (A) for the desired distance of the laser machine tool (8) along the desired movement path during the laser machining of the workpiece (6) are then calculated from the movement paths that have been determined by means of the laser machining nozzle (8) and the measuring head (11).


Patent
Albis Plastic GmbH, ALLOD Werkstoff GmbH & Co. KG, Audi AG, Basf, Sabic, TRUMPF Laser und Systemtechnik GmbH and Daimler AG | Date: 2017-04-19

The invention relates to a method for producing a material composite composed of metal and plastic to form a plastic-metal hybrid component, in which method, to improve the adhesion of the metal surface and at least one plastic component, stochastically random macroscopic and/or microscopic undercuts are made by means of short-pulse laser radiation in the metal surface in order to roughen it, these undercuts each being filled at least partially with the at least one plastic component in an injection moulding process such that said plastic component engages into the macroscopic and/or microscopic undercuts, wherein, following the roughening of the metal surface and before and/or during the injection moulding process for the at least one plastic component, at least the roughened surface of the metal is heated to a temperature which, during processing, lies in the range of room temperature up to 100C above the processing temperature of the plastic.


The invention concerns a method for generating a laser beam (3) with different beam profile characteristics, whereby a laser beam (2) is coupled into one fiber end (1a) of a multi-clad fiber (1), in particular a double-clad fiber, and emitted from the other fiber end (1b) of the multi-clad fiber (1) and whereby, to generate different beam profile characteristics of the output laser beam (3), the input laser beam (2) is electively coupled either at least into the inner fiber core (4) of the multi-clad fiber (1) or at least into at least one outer ring core (6) of the multi-clad fiber (1), as well as a corresponding arrangement (10).


This disclosure relates to a device for monitoring the alignment of a laser beam, comprising: a detector having an opening for passage of the laser beam, at least two temperature sensors which are mounted on the detector, and a temperature monitoring device which is connected to the at least two temperature sensors, for monitoring the alignment of the laser beam relative to the opening. The at least two temperature sensors have a temperature-dependent resistance which either increases as the temperature increases or decreases as the temperature increases, and the at least two temperature sensors are connected in series with the temperature monitoring device. This disclosure relates also to an EUV radiation generating apparatus which has at least one device as described above for monitoring the alignment of a laser beam.


The invention relates to a device (20) for monitoring the orientation of a laser beam (5), comprising: a detector (21) with an opening (22) for the passage of the laser beam (5), at least two temperature sensors (24a, b) which are attached to the detector (21), and a temperature monitoring device (23) which is connected to the at least two temperature sensors (24a, b) in order to monitor the orientation of the laser beam (5) relative to the opening (22). The at least two temperature sensors (24a, b) have a temperature-dependent resistance which either increases as the temperature increases or which decreases as the temperature increases, and the at least two temperature sensors (24a, b) are connected to the temperature monitoring device (23) in a series circuit. The invention also relates to an EUV radiation-generating device (1) which has at least one device (20) as described above in order to monitor the orientation of a laser beam (5).


Patent
TRUMPF Laser und Systemtechnik GmbH | Date: 2017-01-25

A gas laser excitation system with an integrated impedance matching circuit, comprises a gas laser electrode, a high-frequency connection line connectable to the gas laser electrode and configured for transmission of high-frequency power to the gas laser electrode, and a shield configured to shield the high-frequency power to be transmitted. The shield is arranged between the high-frequency connection line and the gas laser electrode. The high-frequency connection line interacts with the gas laser electrode and/or the shield in such a way that the resulting impedance changes at least across a section of the high-frequency connection line.


Patent
TRUMPF Laser und Systemtechnik GmbH | Date: 2017-01-25

An impedance matching circuit for a gas-laser excitation system includes a high-frequency connection line configured to be connected at a first connection point to a power source and at a second connection point to a gas-laser electrode. The impedance matching circuit is characterized in that an impedance of at least one section of the high-frequency connection line changes by a change to a configuration of the high-frequency connection line, in particular to at least one parameter of the high-frequency connection line in the at least one section.


Patent
Trumpf Laser und Systemtechnik GmbH | Date: 2017-01-04

The invention relates to a laser machining head (1) having a focusing optical unit (2) for focusing a laser beam (3) in the direction of a machining zone (4) of a workpiece (5) and having a cross-jet nozzle (6) for producing a cross flow (7), which passes through the focused laser beam (3) transversely, in particular at a right angle, to the beam axis (8) of the focused laser beam (3). According to the invention, the distance (D) of the cross-jet nozzle (6) from the workpiece (5) is less than 20 mm, in particular between 8 mm and 12 mm. Preferably, a nozzle body (10) having a bottom opening (11) open toward the workpiece (5) is provided laterally adjacent to the focused laser beam (3), from which bottom opening a protective gas (12) flows out, wherein the bottom opening (11) is arranged below the cross-jet nozzle (6) in order to entrain the protective gas (12) located between the nozzle body (10) and the workpiece (5) by means of the cross flow (7) of the cross-jet nozzle (6) in a transverse direction (13) at least so far that the protective gas flows over the machining zone (4).

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