这时光束输入的热量远远超过被材料反射、传导或扩散的部分,材料很快加热至汽化程度,蒸发形成孔洞。随着光束与材料相对线性移动,使孔洞连续形成宽度很窄的切缝。切边受热影响很小,基本没有工件变形。 切割过程中还添加与被切材料相适合的辅助汽体。钢切割时利用氧作为辅助汽体与熔融金属产生放热化学反应氧化材料,同时帮助吹走割缝内的熔渣。切割聚丙烯一类塑料使用压缩空气,棉、纸等易燃材料切割使用惰性汽体。进入喷嘴的辅助汽体还能冷却聚焦透镜,防止烟尘进入透镜座内污染镜片并导致镜片过热。 大多数有机与无机材料都可以用激光切割。在工业制造系统占有份量很重的金属加工业,许多金属材料,不管它是什么样的硬度,都可以进行无变形切割。当然,对高反射率材料,如金、银、铜和铝合金,它们也是好的传热导体,因此激光切割很困难,甚至不能切割。
1 Laser cutting a narrow slit, the workpiece deformation laser beam is focused to a small spot, so the focus to achieve high power density。
At this time far exceeds the heat input beam reflected by materials, conduction or diffusion part, the material is heated to vaporization rapidly evaporated to form holes. As the beam and the material relative linear movement, the holes are continuously formed kerf width is very narrow. Trimming heat has little effect, basically no deformation of the workpiece. The cutting process also add material to be cut to match the auxiliary vapor. Steel cutting using oxygen as an auxiliary vapor with the molten metal oxide materials exothermic chemical reaction, while helping to blow away the slag kerf. Polypropylene plastic cutting a class using compressed air, cotton, paper, flammable material cutting use of inert vapor. Auxiliary gas into the nozzle body is also cooled focusing lens, the lens holder to prevent internal contamination smoke into the lens and cause the lens to overheat. Most organic and inorganic materials can be cut with a laser. In industrial manufacturing systems occupy a heavy load of the metal processing industry, many metal materials, regardless of what it is like hardness, can be cut without distortion. Of course, high reflectivity material, such as gold, silver, copper and aluminum, which is a good heat conductor, it is very difficult to laser cutting, or even cut.
Laser cutting burr, wrinkles, high precision, better than plasma cutting。 For many mechanical and electrical manufacturing industry, as a modern microcomputer program control laser cutting system can be easily cut different shapes and sizes of the workpiece, it is more often than punching, molding process even been preferred; despite its processing speed is also slower than the punches, but it did not die consumed without repairing molds, also saving time change the mold, thus saving processing costs, reduce production costs, so in general considered to be more cost-effective。
(2) Laser cutting is a high energy density, good controllability of non-contact machining laser beam is focused to form with a strong energy of a small point of action, apply it to the cutting has many features。
First, the laser light energy into striking heat kept in a very small area, the available
(1) narrow slotted straight edge;
(2) the smallest neighboring trimming of the heat affected zone;
(3) minimal local deformation.
Secondly, the laser beam on the workpiece without applying any force, it is non-contact cutting tool, which means
贵州快3走势(A) the workpiece without mechanical deformation;
(2) No tool wear, there can be no conversion tool;
贵州快3走势(3) cut the material without regard to its hardness, that laser cutting capacity is not being cut hardness influence of any hardness material can be cut.
Again, the laser beam is controllable, and high adaptability and flexibility, thus
(1) and the automation equipment combination is very convenient, easy cutting process automation;
(2) Because there is the cut workpiece limit, the laser beam has an unlimited copying cutting capacity;
(3) combined with the computer, you can entire board nesting material savings。
3 Laser cutting has wide adaptability and flexibility when compared with other conventional processing methods, laser cutting with greater flexibility.
? First, compared with other thermal cutting methods, the same as the thermal cutting process, other methods such as a laser beam that does not act on a small region, resulting in slit width, the heat-affected zone Daiwa apparent deformation of the workpiece. Laser energy cutting non-metallic, and other thermal cutting methods can not.文章来源：（http://www.asslawyers.com）