Fiber laser cutting machine is generally divided into two steps: perforation and cutting. With the growing development of transportation industry, aluminum alloy and other high anti reflective materials are used more and more. From high-speed railway carriages to ships, from civilian to military, the amount of high anti reflective materials is increasing. Therefore, how to achieve fast and stable cutting of high anti reflective materials is a problem faced by all laser cutting machine manufacturers.
To achieve fast and stable cutting of high anti reflective materials, the most critical step is' perforation '. The faster the hole is punched, the smaller the impact of high reflection. Therefore, when cutting high reflection materials, the shorter the hole time is, the better. Accordingly, we need a laser beam with thin spot and high energy density at the spot.
The single mode laser fiber core diameter is thin, the light spot is thin, and the concentrated energy is high, which is the best choice for cutting high reflective materials. Some users may wonder why it is not recommended to use multimode lasers to cut high anti reflective materials? Single mode lasers have the following advantages over multimode lasers:
L Manufacturers that can do multimode lasers may not be able to do single-mode lasers, which involves technical research and development capabilities
L The fiber core of single-mode laser is relatively thin, and the beam quality is better than that of multimode laser
L Single mode laser has high reliability. The more complex multimode laser mode lines are, the higher the damage rate is
L Single mode lasers are easier to maintain
L Small volume
L More power saving
Generally, single mode CW laser is the best choice when cutting high anti material.
Take red copper as an example. Because of its good conductivity, thermal conductivity, ductility and corrosion resistance, red copper is widely used to make electrical equipment such as generators, buses, cables, switching devices, transformers, heat exchangers, pipes, flat plate collectors of solar heating devices and other heat conducting equipment. However, it is difficult and inefficient to process red copper in the traditional way. Laser cutting is a new way to process red copper. However, due to the low laser absorption of red copper, it is easy to damage the laser, so there is little research on light laser cutting red copper in China. According to the research on the process of fiber laser cutting red copper plate [1], The best parameters for cutting 5mm copper plate with Precitec laser head (focusing lens length 200mm, focusing spot diameter 0.2mm,+5~- 15mm) are: power 2600W, speed 1.4m/min, oxygen pressure 16bar, defocusing amount (negative focus) - 4mm.
——Min Dayong, Qi Xiaoyong, Ye Bing, Lu Feixing, Wang Aihua. Study on the process of optical fiber laser cutting copper plate [J] Applied laser 2013, 33 (2) 186-191
How does Wanwa laser cutting machine cut high anti reflective materials? During the cutting process, the material shall be completely cut to reduce the back reflection; The laser high reflection alarm during cutting indicates that the material is not completely cut through, and the cutting speed should be reduced; It is recommended to cut the high anti reflective material alternately with conventional iron plate and stainless steel during the processing, which is conducive to more stable processing and longer service life of the laser.