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F. Bammer, T. Schumi, D. Schuöcker:
"Hot Bending with a Fiber Coupled Solid State Laser";
Vortrag: GCL/HPL 2010, Sofia; 30.08.2010 - 03.09.2010; in: "XVIII International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers", SPIE, 7751 (2010), S. 775122-1 - 775122-6.

Abkanten spröder Materialien mit Hilfe von Lasererwärmung kurz vor und während des Biegens mit externem glasfasergekoppeltem Nd:YAG-Laser

For bending of brittle materials it is necessary to heat up the forming zone. This can be done with a fiber coupled solid state laser, whose beam is evenly distributed on the bending line with a beam splitter installed in the lower tool (die) of a bending press. With polarization optics the laser beam is divided there into partial beams that are evenly distributed on the bending line with lenses and prisms.
A setup for a bending length of 200mm heated by a fiber-coupled 3kW Nd:YAG-laser shows the feasibility of the concept. Successful operation was shown for the Mg-alloy AZ31, which breaks during forming at room temperature, but can be well formed at temperatures in the range of 200-300°C. Other materials benefiting from this method are Ti-alloys, high-strength-Al-alloys, and high-strength-steels. Typical heating times are in the range of up to 5s and much of the heat input is generated during the bending operation where the laser continues to work.
Laser Assisted Bending with a fiber coupled solid state laser is a straightforward way to perform the bending of brittle materials in a process as simple as cold bending.

hot bending, beam splitter, polarizing optics, solid state laser

http://dx.doi.org/10.1117/12.880384