Method and device for bending sheets

US8978418B2 · kind B2 · utility

Assignee

• SAINT-GOBAIN GLASS FRANCE · FR

Inventors

• Michael Balduin · Alsdorf, DE
• Benno Dunkmann · Liège, BE
• Jean-Marie Le Ny · Gemmenich, BE
• Lothar Schmidt · Bochum, DE
• Herbert Radermacher · Raeren, BE

Key dates

• Filing date: Dec 8, 2011
• Grant date: Mar 17, 2015
• Expiry date: Dec 8, 2031

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03B2225/02
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A method for bending a sheet is described. The method includes the following steps: a) at least one sheet is inserted into a pre-bending ring with a movable bending ring holder, the movable bending ring holder is moved into a furnace and the at least one sheet is heated to softening temperature and is pre-bent to 5% to 50% of a final edge bending, b) the at least one sheet is lifted by means of a suction device and is bent further, beyond the bending obtained in the pre-bending ring, c) the at least one sheet is laid down by means of the suction device in a final-bending ring on the movable bending ring holder and is bent to the final edge bending, and an area pre-bending of the at least one sheet is performed by means of thermal irradiation, d) the at least one sheet is lifted out of the final-bending ring by means of a second suction device, pressed against an opposing mould and bent, and the at least one sheet is laid down on the final-bending ring and the at least one sheet is cooled down.