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Verfahren und Vorrichtung zur Erhoehung des Absorptionsgrades beim Oberflaechen-Festphasenhaerten von Werkstuecken mittels Laserstrahlung

Process and device to increase the absorption degree when performing surface solid phase hardening of workpieces by means of laser radiation
 
: Wissenbach, K.; Jung, R.; Kuepper, F.; Vitr, G.

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Frontpage ()

DE 1995-19508584 A: 19950313
DE 1995-19508584 A: 19950313
EP 1995-940224 A: 19951121
EP 1995-940224 AW: 19951121
WO 1995-EP4581 A: 19951121
DE 19508584 C1: 19960208
EP 815267 B1: 19990324
C21D0001
German
Patent, Electronic Publication
Fraunhofer ILT ()

Abstract
A process and a corresponding device are known to increase the absorption degree when performing surface solid phase hardening of workpieces by means of laser radiation, in particular of complex geometry workpieces, whereby measures, which increase the absorption of laser radiation, are performed on the workpiece in the area of the processing zone during the processing process. In order to create a process and a device with which a surface hardness treatment of complex component geometries can be performed in the finished state without previously applying absorption-increasing top coatings, and with which an increased process speed compared with conventional processes can be achieved, and whereby the hardness penetration depth can be increased with comparable process parameters, a process gas is supplied to the processing zone as a measure to increase absorption in the form of a gas mixture consisting of at least one inert gas and oxygen, and the absorption degree of the laser radiatio n in the processing zone of the workpiece is adjusted as a factor of the process gas volumetric flow of the gas mixture and/or of the process gas volumetric flow and/or the temperature in the processing zone during processing as a factor of a reference value.

: http://publica.fraunhofer.de/documents/PX-38645.html