Dialysis of the huge potential of fiber laser metal cutting

High-brightness, high-power solid-state laser sources, such as fiber lasers, demonstrate their potential in future metal cutting applications. IPU was formerly known as the Danish Institute for Product Development, the Institute for Product Development. A new concept developed using a single-mode fiber laser for laser cutting has begun to be applied in the DOEFLAC and ROBOCUT projects, and has been carried out with many other project partners. Cooperation.　　 The initial experimental test shows that this new processing method has the potential to surpass advanced fiber laser cutting and CO2 laser cutting, and is faster, more effective, and cheaper than the latter two laser cutting technologies. It is expected that after the completion of the two projects, this cutting technology will become increasingly mature and reach a certain level, which can be used to manufacture and sell products in accordance with normal commercial conditions.　　Custom beam shape 　　These projects are based on a principle that: Compared with traditional laser cutting using a single circular laser beam, the new cutting process uses a complex laser beam shape. Utilize the unique focusing characteristics of high-power single-mode fiber lasers to generate complex beam shapes and make it possible to separate a part from the overall laser energy in order to create a 'keyhole for laser welding or laser cutting applications. The rest. The energy will be distributed to the melt; before that, the main beam is used to create an appropriate high vapor pressure distribution on the surface of the molten material. This makes it possible to apply local pressure on the melt flowing out of the incision, which is far more than The pressure of coaxial gas jet commonly used in laser cutting. As a result, the incision is very narrow. The new process has great potential. It will not produce burrs in a large cutting speed range, and it can also perform high-speed cutting in narrow contours. Cutting to produce high-quality cuts. 　　Several cutting methods. Moreover, by correctly customizing the laser beam shape (adding the 'cap-shaped beam shape), even if the cutting assist gas is not used, the molten fluid will follow the opposite direction of the incident laser beam Flow out of the incision. Therefore, a single-channel remote cutting technology was developed. This technology has a clear application prospect and can remove the melt from the incision more effectively than advanced remote laser cutting.　　 Beam shaping 　　 The core of this laser cutting technology is beam shaping, which can be achieved in different ways, such as designing a system with a single-mode fiber laser. Through the beam combination structure-instead of converging all single-mode transmission beams into a large transmission fiber, these beams can be transmitted to the cutting head, just as it is used for high-power multi-mode fiber laser configurations.　　 Use a single-mode fiber laser source. Using an advanced optical system and a specially designed artificial hologram (also called diffractive optics), the input laser beam is converted into a radiation pattern in order to optimize a given laser cutting process. Since the beam pattern is asymmetric, the diffractive optics must be rotated according to the actual cutting direction. (The above is edited by metal laser cutting machine for details, please refer to www.gnlaser.com)