I.Laser Cutting The Main Features 1.Laser Cut Kerf, Narrow, Small Deformation

I.Laser Cutting The main features 1.Laser cut kerf, narrow, small deformation of the workpiece Laser beam focused into a small spot, so the focus of Department to achieve high power density.At this time far more than the heat input beam to be material reflection, transmission or spread of some of the material quickly heated to the degree of vaporization, evaporation pores.With the beam and the material is relatively linear movement, so that holes form a continuous narrow kerf width.Cutting heating effect is very small, basically no deformation of the workpiece. Cutting process was also added and all the auxiliary materials for the vapor phase.Steel cutting using oxygen as an auxiliary of the vapor and the molten metal oxide materials, chemical reaction produces heat, while helping to get rid of slotting the slag.Polypropylene plastic cutting a class to use compressed air, cotton, paper, cutting the use of flammable materials, inert vapor.Vapor into the nozzle of the secondary cooling can focus lens, to prevent dust contamination into the lens inside the lens seat and cause overheating lens. Most organic and inorganic materials can be cut with a laser.Hold weight in the industrial manufacturing systems heavy metal processing industries, many metallic materials, no matter what kind of hardness, can be cut without distortion.Of course, highly reflective materials such as gold, silver, copper and aluminum, which is a good heat conductor, Laser Cutting is very difficult, therefore, can not even cut. Laser cutting without burrs, folds, high precision, better than plasma cutting.For many mechanical and electrical manufacturing industry, as the modern laser cutting process control computer system to facilitate the cutting of different shapes and sizes of the workpiece, it is more often than punching, molding process has even been preferred;Although it is slower in processing speed mode Chong, but it does not die consumption, not repair of mold, but also saving time change the mold, thereby saving processing costs, reduced production costs, so in general is considered more cost-effective. 2.Laser cutting is a high energy density, good controllability of non-contact processing Focused Laser beam to form a very small role in a very strong point of energy, it applies to cutting has many features.First, the laser light energy into heat to keep surprising in a very small area, can provide (1) narrow slotted straight edge;(2) minimal heat affected zone close to cutting edge;(3) small local deformation.Second, the laser beam does not exert any force on the workpiece, which is non-contact cutting tool, which means that (1) no mechanical deformation of the workpiece;(2) No tool wear or to talk about the conversion tool;(3) cutting material without regard to its hardness, that is to be cut free from laser cutting capability hardness influence the hardness of the material can be any cut.Again, the laser beam controllable, and has high adaptability and flexibility, so (1) combined with the automation equipment is very convenient, easy to implement cutting process automation;(2) Since there is no limit on cutting the workpiece, the laser beam unlimited copying cutting capacity;(3) combined with a computer can be whole board marker, material savings. 3.Laser cutting with a wide range of adaptability and flexibility Compared with other conventional machining, laser cutting with greater adaptability. First of all, compared with other thermal cutting methods, the same as the thermal cutting process, other methods can not function like a laser beam on a very small area, resulting in incision width, heat affected zone of large and significant deformation of the workpiece.Laser can cut metal, while other thermal cutting methods can not. Second, the main process of laser cutting 1.Vaporization In high-power density laser beam heating, the surface temperature reached the boiling point temperature, the speed is so fast enough to avoid melting caused by heat conduction, so part of the material vaporized into steam disappeared, some material as ejecta from a cut slit the bottom of the auxiliary gas flow was blown away. 2.Melting cutting When the incident laser beam power density exceeds a certain value, the beam irradiation point to open mom evaporation inside the material to form a hole.Once the hole formed, it will be as bold to absorb all the incident beam energy.Holes are surrounded by molten metal wall, and then, with the beam axis of the auxiliary air holes around the molten material away.With the workpiece movement, the direction of synchronous sliding hole formed by cutting a kerf.Laser beam to the front along the slit exposure, continuous or pulse melting material from being blown away within the seam. 3.Oxidation melting cutting General use of inert gas fusion cutting, if replaced by oxygen or other reactive gases, materials, laser beam irradiation was lit, and oxygen to the intense heat of chemical reaction, the other is called oxidation melting cutting. 4.Control of faults, Easy to heat for brittle materials, laser beam heating by high-speed, controlled cut, called the control fault cutting.Main contents of this cutting process:Laser beam heating small areas of brittle materials, causing large thermal gradient in the region and severe mechanical deformation, leading to the formation of cracks in materials.Keeping a balanced heating gradient, the laser beam can guide the direction of crack produced in any required. Three common engineering materials, laser cutting 1.Laser cutting of metal materials Although almost all metal materials at room temperature, the energy of infrared waves have a high reflectivity, but the emission in the infrared band 10.6um CO2 laser beam is successfully applied to many metal laser cutting practice.Metal 10.6um initial absorption rate laser beam is only 0.5% to 10%, but when has the power density over 106w/cm2 the focused laser beam irradiation to the metal surface, was able in the microsecond time soon so surface begins to melt.Most of molten metal in the absorption rate has risen sharply generally increased 60% to 80%. 2.Non-metallic materials, laser cutting 0.6 m wavelength CO 2 Laser beam is easily absorbed non-metallic materials, good thermal conductivity and low evaporation temperature has to absorb almost the entire input beam inside the material, and beam irradiation in the instant vaporization of office to form a starting hole, into cutting process, a virtuous circle. 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