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An example for modular diode laser systems: Minimizing warpage during transformation hardening of linear guiding rails

: Drenker, A.; Baumann, M.; Pirch, N.; Plum, H.-D.; Sommer, J.; Vitr, G.; Kaierle, S.; Wissenbach, K.; Poprawe, R.

Poprawe, R. ; Wissenschaftliche Gesellschaft Lasertechnik -WLT-:
Lasers in Manufacturing 2003 : Proceedings of the Second International WLT-Conference on Lasers in Manufacturing 2003
München: AT-Verlag, 2003
ISBN: 3-00-011673-7
International Conference on Lasers in Manufacturing <2, 2003, München>
Fraunhofer ILT ()
modular diode laser system; multiple beam technique; minimizing bending distortion; torsion; ball monorail linear guidance system; temperature measurement; feed back control

Warpage is a problem that frequently occurs in laser transformation hardening of precision parts. If, for example, the ball bearing tracks of a linear guiding rail are sequentially hardened with a single laser, this results in bending distortion and torsion of the rail. Afterwards the rail has to be straightened manually. This paper presents a multiple laser beam technique for solving this problem. A process controlling modular diode laser system is set up and used for hardening of the four ball bearing tracks of a precision linear guiding rail simultaneously. The diode laser system consists of up to ten modules. Each module is equipped with a pyrometer for temperature measurement and feed back control in each processing zone. By multiple beam technique the torsion of the guiding rail can be completely avoided. The resulting bending distortion can be minimized in a second step by a straightening treatment, using the same modular diode laser system.