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 ក្បាល becomes particularly important.
ការកាត់គែម - កំដៅខ្លាំងពេកនឹងត្រូវបានតំកល់នៅតាមតំបន់ទាំងសងខាងនៅពេលដែលល្បឿនកាត់យឺតដែលបណ្តាលឱ្យមានរនាំងរដុបនិងថែមទាំងឆេះគែមទៀតផង។
The ក្បាល 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 ក្បាល 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 ក្បាល designs: "low speed ក្បាល" (gas velocity is less than the speed of sound) and "high speed ក្បាល" (gas velocity is close to the speed of sound). The factors affecting the performance of the ក្បាល include the air pressure of the cutting head cavity, the diameter of the ក្បាល, the internal shape of the ក្បាល and the shape of the ក្បាល outlet.
សមា្ភារៈមួយចំនួនដូចជាដែកអ៊ីណុកនិងយ៉ាន់ស្ព័រអាលុយមីញ៉ូមមានការលំបាកក្នុងការធានាថាផ្នែកខាងក្រោមនៃផ្នែកកាត់គឺមិនមានការបំផ្លាញទាំងស្រុងទេពីព្រោះដែករលាយរបស់ពួកគេមាន viscosity ខ្លាំងដូច្នេះក្នុងករណីអត្រាលំហូរទាបមិនងាយស្រួលក្នុងការដកចេញទេ។ នៅផ្នែកខាងក្រោមនៃផ្នែករឹងដើម្បីបង្កើតជាការបោះ។
High-speed ក្បាលs work in the same way as exhaust in rockets and jet engines, accelerating the flow of gas into the ក្បាលs, so they are better at cutting through sticky materials.
However, if the low-speed ក្បាល is used, the pressure on the work-piece surface will fluctuate greatly with the change of cutting height, resulting in unsatisfactory cutting effect.