Fraunhofer-Gesellschaft

Publica

Hier finden Sie wissenschaftliche Publikationen aus den Fraunhofer-Instituten.

Verfahren zur formgebenden Bearbeitung von Werkstuecken

Method for form-giving processing of workpieces, comprises forming the workpieces from two different flat materials connecting to each other as layer composite through cutting with a focusing laser beam
 
: Wagner, L.; Luetke, M.

:
Frontpage ()

DE 102009049762 A: 20091009
DE 102009049762 A: 20091009
B23K0026
H01M0002
H01M0004
Deutsch
Patent, Elektronische Publikation
Fraunhofer IWS ()

Abstract
(B3) Die Erfindung betrifft ein Verfahren zur formgebenden Bearbeitung von Werkstuecken. Die Werkstuecke sind dabei aus mindestens zwei unterschiedlichen, flaechig miteinander verbundenen Werkstoffen, als Schichtverbund gebildet. Die Bearbeitung erfolgt durch Schneiden mit einem fokussierten Laserstrahl, der eine Leistungsdichte im Brennpunkt von mindestens 1 * 107 W/cm2 aufweist und dabei werden die Schnittfugen ausschliesslich durch ablativen Werkstoffabtrag ausgebildet. Es wird so vorgegangen, dass bei einem ersten Abtragszyklus die zuerst dem Einfluss des Laserstrahls ausgesetzte Schicht des Schichtverbundes mit reduzierter Leistung des Laserstrahls bestrahlt und der Brennfleck des Laserstrahls mit kleinerer Vorschubgeschwindigkeit entlang der auszubildenden Schneidkontur bewegt wird, als dies bei mindestens einem weiteren Abtragszyklus, der zum Werkstoffabtrag an mindestens einer weiteren Schicht des Schichtverbundes fuehrt, erfolgt. Waehrend des gesamten weiteren Abtragszyklus wird eine Vorschubgeschwindigkeit von mindestens 500 m/min eingehalten und der Laserstrahl mit einer mindestens zweifach groesseren Leistung betrieben, als beim ersten Arbeitszyklus.

 

DE 102009049762 B3 UPAB: 20110207 NOVELTY - The method for form-giving processing of workpieces, comprises forming the workpieces from two different flat materials connecting to each other as layer composite through cutting with a focusing laser beam that has a power density in focus of 1.107 W/cm2 and is formed in cut joint exclusively by ablative material removal. The layer of the layer composite stopping the influence of the laser beam is irradiated with reduced power of the laser beam in the first process cycle and the focal spot of the laser beam is moved with small feed speed along the cutting edge contour to be formed. DETAILED DESCRIPTION - The method for form-giving processing of workpieces, comprises forming the workpieces from two different flat materials connecting to each other as layer composite through cutting with a focusing laser beam that has a power density in focus of 1.107 W/cm2 and is formed in cut joint exclusively by ablative material removal. The layer of the layer composite stopping the influence of the laser beam is irradiated with reduced power of the laser beam in the first process cycle and the focal spot of the laser beam is moved with small feed speed along the cutting edge contour to be formed that guides on the further layer of the layer composite to material removal in the further process cycle, where a feed speed of 500 m/min is kept during the further process cycle and the laser beam is processed with a power as during the first process cycle. A further layer composite formed from inorganic material is processed. The focal point is moved during the first process cycle along the cutting contour to be formed. During the first process cycle, the used power of the laser beam corresponds to 20% of the power that is used in the further process cycle. The feed speed is kept during the first process cycle that corresponds to maximum 20% of the feed speed during the further process cycle. The layer made of ceramic materials is partially removed during the first process cycle. The laser beam is focused so that the focal point has a diameter of less than 100 mu m and the laser beam is processed in cw-mode. During the first process cycle, the laser beam is processed with a power of 50-200 W and the focal point is moved with a feed speed of 30-100 m/min and during the further process cycle, the laser beam is processed with a power of 300 W to 1 kW and the focal point is moved with a feed speed of 500-1000 m/min, where individual elements are produced for electro energy storage elements. USE - Method useful for form-giving processing of workpieces. ADVANTAGE - The method ensures simple and efficient form-giving processing of workpieces with good quality.

: http://publica.fraunhofer.de/dokumente/N-159124.html