Method of shaping a carrier sheet of high hardness

A method for shaping a carrier sheet (1) of high hardness, in particular a gres sheet, the method comprising the steps of:

• providing a solid carrier sheet (1) of high hardness having a thickness of at least 6 mm;
• covering (S100) a front surface (10) of the carrier sheet (1) with a removable vibration-absorbing protective layer (20);
• providing (S110) the surface of the protective layer (20) remote from the carrier sheet (1) with a glass sheet (30);
• on the back surface (11) of the carrier sheet (1) opposite the front surface (10) thereof, forming a plurality of cavities (50) according to a predetermined pattern, the step of forming comprising:
• forming the cavities (50) by milling (S120) so that in each cavity (50) the remaining thickness of the carrier sheet (1) along the front surface (10) is at least 3 mm and at most 5 mm;
• during milling, at least one physical property of the vibration of the carrier sheet (1) is continuously measured (S121) on the front surface (10) of the carrier sheet (1) by means of at least one sensor;
• on the basis of at the least one physical property measured by the sensor, adjusting the operation of the milling tool so that the vibration properties of the carrier sheet (1) do not exceed predetermined threshold values;
• by applying a first optical method (S130), taking a first 3D image of the surface roughness of the milled cavities (50);
• further reducing the surface roughness of the cavities (50) by shot blasting (S140), wherein during the shot blasting, the operation of the shot blasting tool is controlled using parameters determined on the basis of the first 3D image taken during the first scanning;
• by applying a second 3D scanning (S150), taking a second 3D image of the surface roughness of the cavities (50) treated by shot blasting;
• and
• by applying laser beam milling (S160), further reducing the surface roughness of the cavities (50), wherein the operation of the laser beam milling tool is controlled on the basis of the second 3D image taken after the laser beam milling by the second 3D scanning so that the surface roughness of the cavities (50) falls in the submicron range.