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Product Code: ICAL07_1906

Novel Machine System for Simultaneous Heat Treatment with Dynamic Beam Shaping
Authors:
Steffen Bonss, Fraunhofer IWS; Dresden Germany
Frank Tietz, Fraunhofer IWS; Dresden Germany
Jan Hannweber, Fraunhofer IWS; Dresden Germany
Marko Seifert, Fraunhofer IWS; Dresden Germany
Stefan Kuehn, Fraunhofer IWS; Dresden Germany
Udo Karsunke, Fraunhofer IWS; Dresden Germany
Berndt Brenner, Fraunhofer IWS; Dresden Germany
Eckhard Beyer, Fraunhofer IWS; Dresden Germany
Presented at ICALEO 2007

Laser beam hardening has been established during the last years as a complementary technology for local heat treatment tasks at tool manufacturing and automotive industry. Especially new high power diode lasers and a lot of process supporting systems, what have been developed in recent years, are responsible for the increase of industrial laser hardening applications. Since laser beam hardening is done by a laser spot movement along a well defined track there is sometimes the problem of annealing zones at closed contours. On the other hand the preferable angle of incidence should larger than 45°. That can avoid an annealing zone free hardening of edges and radii. A solution can be laser heat treatment with two separately moved laser spots. For hardening closed contours two spots start at the same position and finish their movement synchronously at another but same position. Two separate laser beams can harden edges simultaneously applying the optimum angle of incidence respectively. A machine system based on two cooperating robots has been developed therefore. Two fiber coupled high power diode lasers deliver laser energy. Dynamic beam shaping systems and process measuring and control units enable optimum laser spot sizes and reliable processes.

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