Search International and National Patent Collections

1. (WO2001032349) METHOD AND DEVICE FOR RAPID CUTTING OF A WORKPIECE FROM A BRITTLE MATERIAL

Pub. No.:    WO/2001/032349    International Application No.:    PCT/EP2000/010577
Publication Date: Fri May 11 01:59:59 CEST 2001 International Filing Date: Sat Oct 28 01:59:59 CEST 2000
IPC: B28D 1/00
B23K 26/146
C03B 33/09
C04B 41/80
Applicants: SCHOTT SPEZIALGLAS GMBH
HOETZEL, Bernd
Inventors: HOETZEL, Bernd
Title: METHOD AND DEVICE FOR RAPID CUTTING OF A WORKPIECE FROM A BRITTLE MATERIAL
Abstract:
The invention relates to a method and a device for rapid cutting of a workpiece from a brittle material by means of a laser beam along a predetermined cutting line of any shape. The method comprises the following steps: creation of the laser beam; coupled guiding of the laser beam focussed on the cutting line without welding the material; forming the laser beam in such a way that the beam cross-section acting on the surface of the material to be cut in the form of a focal spot corresponds to a pre-determined shape and intensity pattern; generating a relative movement between the laser beam and the workpiece along the cutting line with inducement of a thermo-mechanical tension; blowing a fluid cooling medium onto the section of heated cutting line, for subsequent cooling thereof and raising the thermomechanical tension to a point above the fracture strength of the material.