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Proceedings Paper

Laser-based gluing of diamond-tipped saw blades
Author(s): Christian Hennigs; Rabi Lahdo; André Springer; Stefan Kaierle; Michael Hustedt; Helmut Brand; Richard Wloka; Frank Zobel; Peter Dültgen
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Paper Abstract

To process natural stone such as marble or granite, saw blades equipped with wear-resistant diamond grinding segments are used, typically joined to the blade by brazing. In case of damage or wear, they must be exchanged. Due to the large energy input during thermal loosening and subsequent brazing, the repair causes extended heat-affected zones with serious microstructure changes, resulting in shape distortions and disadvantageous stress distributions. Consequently, axial run-out deviations and cutting losses increase.

In this work, a new near-infrared laser-based process chain is presented to overcome the deficits of conventional brazing-based repair of diamond-tipped steel saw blades. Thus, additional tensioning and straightening steps can be avoided. The process chain starts with thermal debonding of the worn grinding segments, using a continuous-wave laser to heat the segments gently and to exceed the adhesive’s decomposition temperature. Afterwards, short-pulsed laser radiation removes remaining adhesive from the blade in order to achieve clean joining surfaces. The third step is roughening and activation of the joining surfaces, again using short-pulsed laser radiation. Finally, the grinding segments are glued onto the blade with a defined adhesive layer, using continuous-wave laser radiation. Here, the adhesive is heated to its curing temperature by irradiating the respective grinding segment, ensuring minimal thermal influence on the blade.

For demonstration, a prototype unit was constructed to perform the different steps of the process chain on-site at the saw-blade user’s facilities. This unit was used to re-equip a saw blade with a complete set of grinding segments. This saw blade was used successfully to cut different materials, amongst others granite.

Paper Details

Date Published: 18 March 2016
PDF: 14 pages
Proc. SPIE 9741, High-Power Laser Materials Processing: Lasers, Beam Delivery, Diagnostics, and Applications V, 97410C (18 March 2016); doi: 10.1117/12.2212842
Show Author Affiliations
Christian Hennigs, Laser Zentrum Hannover e.V. (Germany)
Rabi Lahdo, Laser Zentrum Hannover e.V. (Germany)
André Springer, Laser Zentrum Hannover e.V. (Germany)
Stefan Kaierle, Laser Zentrum Hannover e.V. (Germany)
Michael Hustedt, Laser Zentrum Hannover e.V. (Germany)
Helmut Brand, Institut für Werkzeugforschung und Werkstoffe (Germany)
Richard Wloka, Institut für Werkzeugforschung und Werkstoffe (Germany)
Frank Zobel, Institut für Werkzeugforschung und Werkstoffe (Germany)
Peter Dültgen, Institut für Werkzeugforschung und Werkstoffe (Germany)

Published in SPIE Proceedings Vol. 9741:
High-Power Laser Materials Processing: Lasers, Beam Delivery, Diagnostics, and Applications V
Friedhelm Dorsch; Stefan Kaierle, Editor(s)

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