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 ugliu becomes particularly important.
Frangia di tagliu - Troppu calore serà depositu lucalmente da i dui lati di a fessura quandu a velocità di tagliu hè lenta, dendu à una frangia ruvida è ancu una brucia di bordu.
A Panoramica di u Tagliu Laser:
The ugliu 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 ugliu 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 ugliu designs: "low speed ugliu" (gas velocity is less than the speed of sound) and "high speed ugliu" (gas velocity is close to the speed of sound). The factors affecting the performance of the ugliu include the air pressure of the cutting head cavity, the diameter of the ugliu, the internal shape of the ugliu and the shape of the ugliu outlet.
Alcuni materiali cume l'acciaio inox è l'alea di alluminiu sò difficiuli per assicurà chì u fondu di a sezione tagliata sia completamente senza frese, perchè u so metallo fusu hà una forte viscosità, dunque in u casu di u flussu bassu ùn hè micca faciule da rimuovere, à u fondu di a seccione di solidificazione pisante per furmà babbs.
High-speed uglius work in the same way as exhaust in rockets and jet engines, accelerating the flow of gas into the uglius, so they are better at cutting through sticky materials.
However, if the low-speed ugliu is used, the pressure on the work-piece surface will fluctuate greatly with the change of cutting height, resulting in unsatisfactory cutting effect.