In recent years, the heat of Wanwa laser cutting machine has continued to rise. With the rapid development of high-speed railway, shipping, petrochemical, aerospace and other fields in China and the continuous breakthrough of laser cutting technology, the requirements of high power, large format, high-speed cutting, ultra thick plate cutting, bright surface cutting, and high perpendicularity of cutting edge have gradually become the development direction of Wanwa laser cutting machine.
Wanwa laser cutting machine
The key of Wanwa laser cutting machine is the word "Wanwa". Its optical path system is mainly composed of Wanwa laser, transmission fiber and laser head. In order to make the Wanwa laser cutting machine have a stable cutting effect, you must first have a stable and powerful laser light source, which comes from the laser.
stable
The lasers of the 10000 watt laser cutting machine are all continuous lasers, and continuous lasers are divided into single-mode (block) lasers and multi-mode (block) lasers. Taking a well-known domestic laser manufacturer as an example, its single-mode continuous laser power can reach 6000W, which is the highest output power level of domestic single-mode continuous lasers at present. When there is only one pump module in the laser, it is called a single-mode laser, that is, the 6000W single-mode continuous laser only contains one pump module.
At present, ultra high power continuous lasers, especially the ten thousand watt laser cutting machine, are equipped with domestic lasers that are multimode continuous lasers. Generally speaking, high-power multimode continuous lasers are formed by coupling the light source of low power single-mode continuous lasers (that is, a single pump module) through a beam combiner. For example, the multimode continuous laser of 12000W laser cutting machine can be coupled with two 6000W pump modules. The fewer single pump modules used by a multi module continuous laser, the higher the reliability, the more modules, the more complex the circuit, and the higher the damage rate.
Compared with foreign high power lasers, China's ten thousand watt lasers are still dominated by multimode continuous, while foreign excellent high power lasers have achieved a maximum of 20 kW single-mode output and a maximum of 500 kW multi-mode output. China's high power laser production technology needs to be improved.
Strong
Next, let's talk about why the laser beam from the ten thousand watt laser can cut super thick plates.
Let's start with a knowledge point: the core diameter of single-mode laser fiber is thin, the light spot is thin, and the concentrated energy is high, and the core diameter of single-mode laser is generally 50 μ m、100 μ M is the standard, while the ten thousand watt laser passes the ultra high power laser beam through 100 μ It is conceivable that the energy and power density of m fiber output in the core diameter.
Relation between cutting effect of different materials and laser power
Features of bright cutting: smooth section, small section taper, fast cutting speed, suitable for cutting complex graphics, no corner burning, and there is limit power (when the laser power does not reach the limit power, the higher the power, the better the cutting effect (cutting speed), but once the limit cutting power is exceeded, it is meaningless to increase the laser power).
Generally speaking, the beam quality of single module CW laser is better than that of multi module CW laser. Single mode CW laser has unique performance in cutting thin plates, but the cutting ability of thick plates is poor; On the contrary, the laser with poor beam quality can cut thick plates better than the laser with good beam quality. Therefore, in order to make up for the lack of performance of single-mode laser cutting thick plates, a technical innovation - flat top annular light output is adopted to weaken the focus energy concentration and strengthen the halo energy. In this way, the ten thousand watt laser cutting machine coupled by a single mode continuous laser has better cutting effect and cutting speed on ultra thick plate cutting.