Sheet metal processing technology is widely used in metal and non-metallic materials processing, which can greatly reduce processing time, reduce processing costs and improve the quality of workpieces. The modern laser has become the "sword" that people are imaginary to pursue. Taking Tianxiang laser CO2 sheet metal machining machine as an example, the whole system is composed of control system, motion system, optical system, water cooling system, smoke exhausting and blowing protection system. It adopts the most advanced numerical control mode to realize the equal energy cutting with multi axis linkage and laser without the influence of speed. It supports DXP, PLT, CNC and other graphic formats at the same time. The interface graphics processing ability is enhanced, and the imported servo motor and transmission guide structure with superior performance are used to achieve good motion accuracy under high speed condition.
The main processes are as follows:
1, vaporization cutting.
Under the heating of high power density laser beam, the velocity of the surface temperature of the material to the boiling point is so fast that it is enough to avoid the melting caused by the heat conduction, so that some materials vaporize into steam, and some materials are blown away from the bottom of the cutting seam as the ejecta. Some materials that can not be melted, such as wood, carbon materials and some plastics, are cut through this vaporization cutting method.
In the process of vaporization and cutting, steam carries away melting particles and scouring debris to form holes. During the vaporization process, about 40% of the material was vaporized and 60% of the material was expelled by air in the form of droplets.
2. Melt and cut.
When the power density of the incident laser beam exceeds a certain value, the material inside the beam point begins to evaporate and form a hole. Once the pore is formed, it will absorb all incident beam energy as a blackbody. The small hole is surrounded by the molten metal wall, and then the auxiliary air stream coaxial with the beam takes away the molten material around the hole. As the workpiece moves, the hole moves along the direction of cutting to form a slit. The laser beam continues to illuminate along the front edge of the seam, and the molten material is blown continuously or pulsating from the seam.
标签:   钣金加工 激光切割加工