Abstract:
The invention concerns a device for plating two or more metal plates, strips, etc., by the absorption of laser energy. The device is fitted with beam-forming optics which form the laser radiation into a beam with a rectangular cross-section. Used as a radiation source is a laser-diode array in which several laser diodes are disposed next to each other in the same plane to give bars which can be laid next to each other, as well as stacked one on top of each other, in any numbers. In order to homogenize the laser radiation produced by the array to give a rectangular cross-section, the device proposed is fitted with special means such as a prism which converges in the shape of a wedge, a glass plate with a rectangular cross-section, reflective boundary drives, etc. The rectangular cross-section beam heats the two surfaces of the metal plates being plated only locally, over limited areas and to small depths, to the plastic state. In addition, sensors and control devices for control of the power of the laser-diode array and/or for changing the speed of advance of the metal plates being plated.
Abstract:
The present invention relates to a method of producing a (shaped) ceramic or glass-ceramic article, involving the steps of: (a) providing a powder or a powder mixture comprising ceramic or glass-ceramic material, (b) depositing a layer of said powder or powder mixture on a surface, (d) heating at least one region of said layer by means of an energy beam or a plurality of energy beams to a maximum temperature such that at least a part of said ceramic or glass-ceramic material in said at least one region is melted and (e) cooling said at least one region of said layer so that at least part of the material melted in step (d) is solidified, such that the layer is joined with said surface in said at least one region. The invention also relates to ceramic or glass-ceramic articles and their use.
Abstract:
Die Erfindung betrifft ein Verfahren zum Herstellen eines Formkörpers aus Keramik durch schichtweises Aufbauen aus pulverförmigem Werkstoff, bei dem jede Pulverschicht in einem vorgegebenen, einem Querschnittsbereich des herzustellenden Formkörpers entsprechenden Bereich vor dem Aufbringen der nächstfolgenden Pulverschicht mittels Laserstrahlung über die gesamte Schichtdicke vollständig aufgeschmolzen wird, und wobei der Werkstoff mindestens zwei keramische Stoffe enthält, die ein eutektisches System bilden.
Abstract:
Die vorliegende Erfindung betrifft ein Verfahren zum dauerhaften Aufbringen eines Graustufen-Bildes (1) auf eine matte, mit Laserstrahlung polierbare Oberfläche (5) , bei dem Bilddaten des Graustufen-Bildes (1) bereitgestellt werden, die eine Zuordnung von Graustufen zu Bildpunkten des Bildes umfassen. Ein Laserstrahl (4) eines gepulsten Lasers wird zur glättenden Bearbeitung in aneinander grenzenden oder teilweise überlappenden Bahnen (7) über die Oberfläche (5) geführt, während Bearbeitungsparameter auf Basis der Bilddaten derart moduliert werden, dass unterschiedliche Graustufen der Bildpunkte durch lokal unterschiedliches Glätten der Oberfläche (5) in unterschiedliche Glanzgrade der Oberfläche (5) umgesetzt werden. Mit dem vorliegenden Verfahren lassen sich Graustufen-Bilder hoher Auflösung in die Oberflächen von metallischen Werkstücken polieren.
Abstract:
The invention relates to a method for machining materials by diode radiation, especially laser diode radiation. In order to adapt the beam profile to the machining process, the method is implemented in such a way that the radiation emitted by a plurality of diodes with a predetermined beam profile is directed towards the machining region of the workpiece and the intensity distribution in the beam profile is altered by controlling the diode output power.
Abstract:
Described is a method of remelting workpiece surfaces, in particular coated surfaces, using laser radiation. The invention is characterized in that the surface is worked with a laser beam which strikes the workpiece surface at an angle of incidence other than zero in such a way that the remelting process is carried out in stabbing fashion. The laser radiation is preferably linear-polarized (p-polarized) and the degree of absorption of the radiation is controlled by choice of the appropriate angle of incidence in accordance with Fresnel's reflection curves.
Abstract:
Die vorliegende Erfindung betrifft eine Vorrichtung sowie ein Verfahren zum selektiven LaserSchmelzen von hochschmelzenden metallischen Werkstoffen. Das Aufbauvolumen der Vorrichtung wird durch Seitenwandungen (2) sowie eine in der Höhe verschiebbare Bauplattform (3) für den Aufbau eines Bauteils (9) begrenzt. Beabstandet von den Seitenwandungen (2) ist eine Heizplatte (5) auf der Bauplattform (3) aufgebracht oder in deren Oberfläche integriert, die derart ausgebildet und durch eine Isolationsschicht (4) gegen die Bauplattform (3) thermisch isoliert ist, dass sie im Heizbetrieb Temperaturen von mindestens 500° C erreicht. Mit der Vorrichtung und dem zugehörigen Verfahren werden die metallischen Bauteile während des Aufbauprozesses auf Temperaturen oberhalb von 500° C gehaletn, so dass die Gefahr von Spannungen oder Rissbildung im Bauteil vermindert wird.
Abstract:
The invention relates to a device for selective laser sintering for producing a moulded part. The inventive device comprises a process chamber (1) having a structural volume (7) for the moulded part (16). Said structural volume (7) is located underneath the floor area (4) of said process chamber. The inventive device also comprises a leveling device for distributing a material in powder form over an area of the floor area of the process chamber in the form of a layer of constant thickness. According to the invention, said leveling device comprises an element (21) which is moved over the floor area in order to distribute said material in powder form. The device further comprises a roller (22) which is embodied as a grinding device by which means the surface of the moulded part to be treated can be smoothed, the moulded part being located in the structural volume. The inventive device prevents wear and tear of the leveling device and ensures that a constant layer thickness is achieved in such a way that components can be produced with better accuracy and better surface quality.
Abstract:
This invention concerns a process for hand-guided processing of work pieces (5) using irradiation, particularly using laser irradiation (1), in which an irradiation emitting head (21) with a spacer (22) is placed on the work piece (5) and in which gas (10) is supplied to the processing point (4) from which gas is evacuated. To improve the safety of the process, pressure and/or flow parameters of the gas flow are measured when the spacer (22) is tightly placed over the work piece (5), and upon predetermined parameter values and/or predetermined changes in parameter values, an automatic reduction or increase in the irradiation is carried out.
Abstract:
The invention concerns a method of irradiating coated workpieces with laser radiation, in which the surface temperature of the irradiated workpiece, in particular the zone being worked (20) is measured. In order to determine the temperature (Υ2) of the workpiece in the zone being worked (20), even underneath a coating (12), the power of the laser radiation is modulated with a degree of modulation which is low in comparison with the power of the radiation (PL) and, to determine the temperature (Υ2) of the workpiece surface (13) at a point where it is covered by at least one coating layer (12), a temperature (Υb) is subtracted from the temperature (Υ0) at the surface of the coating layer (12), the value of (Υb) being calculated by multiplying together the laser power (PL) absorbed by the workpiece (10) and the thermal resistance (Rth02) of the heat flow through the layer (12) into the workpiece (10), determined from the equivalent heat-flow diagram for the workpiece (10) concerned.