Once the slit is formed, the material is removed from the nearly vertical cutting front (the thin molten layer), where the laser energy is absorbed by the base material during the cutting process. The gasification of the heated material, the slag spraying at the bottom, the heat conduction and melting of the material will cause the heat loss and loss in the cutting process. Therefore, in order to meet the processing efficiency, laser power and technological parameters, the selection of the optical ratio of the cutting head and the qûlik becomes particularly important.
Firîngeya birrînê - Gava ku leza birrînê hêdî be, dê pir germ li her du aliyên şikeftê bi cîh bê danîn, û di encamê de qiraxa xav û hetta qiraxa wê dişewite.
Nerîna Nozzleya Qutkirina Lazer:
The qûlik plays a very important role in laser cutting. Its main purpose is to release the auxiliary gas into the cutting material surface and the cutting seam, so that the molten and gasified base material produced during the cutting process can be discharged, leaving a clean cut.
If the qûlik is not designed and maintained properly and the machining precision is not enough, the flow velocity of gas will weaken and the flow direction will become unstable, which will affect the removal of materials during the cutting process and ultimately lead to unsatisfactory cutting effect.
At present, there are two main qûlik designs: "low speed qûlik" (gas velocity is less than the speed of sound) and "high speed qûlik" (gas velocity is close to the speed of sound). The factors affecting the performance of the qûlik include the air pressure of the cutting head cavity, the diameter of the qûlik, the internal shape of the qûlik and the shape of the qûlik outlet.
Hin materyal ên wekî polayê zengarnegir û bafûn alumînyûm dijwar e ku mirov binê beşa birrîn bi tevahî ji burrsan paqij bibe, ji ber ku metalên wan ên helandî xwedî vîskozîteyek bihêz e, ji ber vê yekê di mijara rêjeya herikîna kêm de ne hêsan e ku werin rakirin, li binê beşa zexmkirina giran ku burrs çêdikin.
High-speed qûliks work in the same way as exhaust in rockets and jet engines, accelerating the flow of gas into the qûliks, so they are better at cutting through sticky materials.
However, if the low-speed qûlik is used, the pressure on the work-piece surface will fluctuate greatly with the change of cutting height, resulting in unsatisfactory cutting effect.