OPTICAL HEAD FOR sheet metal laser cutting thickness of 12 mm and more continuous fiber laser power up to 4 kW

摘要

The invention relates to optical heads intended for cutting 12 mm thick sheet metal and above a continuous fiber laser up to 4 kW. Known optical head for laser cutting of sheet metal, comprising the treated metal surface for a tracking system and successively arranged in the housing along the optical axis of the nozzle assembly, a focusing system, the telescopic system and apparatus of laser emission output from the optical fiber. It is proposed to provide a known optical pickup unit providing movement along the optical axis of the focusing system with respect to the telescopic system to obtain the ratio fk telescopic lens system to focus the focusing lens focus system fo equal to 1/3, and the node providing simultaneous movement along the optical axis of the focusing system and the telescopic to obtain the ratio of the nozzle diameter dc of the optical head to the height position of the focal spot on the optical axes relative to the treated metal surface hf equal to 1/3. Tracking system for the treated metal surface is formed capacitively and is mounted on an optical head housing. Cutting metal is carried out at a ratio of the focus lens of the telescopic system fk to the focus lens focusing system and an optical head fo nozzle diameter dc to the height position of the focal spot on the optical axis with respect to the treated metal surface hf equal to 1/3. The claimed optical head will increase the edge quality of the cut sheet metal due to obtain maximum constriction length without loss radiation density. 1 n.p.f. 6 z.p.f. 2 FIG.