Eyes123456's blog
Laser cutting technology is the use of high-energy laser beam heating the workpiece, so that the temperature rises rapidly in a very short period of time to reach the boiling point of the material, the material began to vaporize, the formation of steam. These vapors are ejected at high velocities, creating a cut in the material as the vapor is ejected.
Laser cutting is the use of focused high power laser pointer beam irradiation of the workpiece, so that the material is rapidly melting melting, vaporization, ablation or burning to reach the same time with the coaxial high-speed airflow with the beam blown molten material, in order to achieve the workpiece cut open. Laser cutting is one of the thermal cutting methods. Laser cutting can be divided into laser vaporization cutting, laser melting cutting, laser oxygen cutting and laser scribing and control of four types of fracture.
The use of high-energy laser beam heating the workpiece, the temperature rose rapidly in a very short period of time to reach the boiling point of the material, the material began to vaporize, the formation of steam. These vapors are ejected at high velocities, creating a cut in the material as the vapor is ejected. The vaporization heat of the material is generally large, so a large amount of power and power density is required for laser vaporization cutting. Laser vaporization cutting for thin metal materials and non-metallic materials (such as paper, cloth, wood, plastic and rubber, etc.) cutting.
In the laser melting, the metal material is melted by burning laser pointer heating, and the non-oxidizing gas (Ar, He, N, etc.) is injected through the nozzle coaxial with the light beam. The liquid metal is discharged by the strong pressure of the gas to form the incision. Laser melting does not require the metal to fully vaporize, the energy required is only vapor cutting 1 / Laser melting cutting is mainly used for some difficult to oxidize the material or active metal cutting, such as stainless steel, titanium, aluminum and its alloys.
Laser oxygen cutting principle is similar to oxygen acetylene cutting. It uses laser as a preheating heat source, with oxygen and other reactive gases as cutting gas. On the other hand, the molten oxide and the molten material are blown out from the reaction zone to form a notch in the metal. In this way, the gas is oxidized and the oxidation heat is released. As the oxidation process in the cutting process produces a lot of heat, so the laser oxygen cutting the energy required is only melt cutting 1/2, and cutting speed is much larger than the laser vaporization cutting and melting cutting. Laser oxygen cutting is mainly used for carbon steel, titanium steel and heat-treated steel and other easily oxidized metal materials.
Laser scribing is the use of high-energy-density 1000mw laser pointer scanning of the surface of brittle materials, the material heated to evaporate a small tank, and then apply a certain pressure, brittle material will crack along the small slot. Lasers for laser scribing are typically Q-switched lasers and CO2 lasers. The controlled fracture is a steep temperature distribution created by the use of a laser scribe, creating localized thermal stresses in the brittle material and breaking the material along the trough.
The laser beam is focused into a very small spot of light, resulting in a very high power density at the focal point. At this time the beam of heat input is far more than the material reflection, conduction or diffusion of the material quickly heated to the degree of evaporation, the formation of holes in the evaporation. As the beam and the material relative to the linear movement, so that the formation of continuous narrow width of the kerf. Cutting edge heat affected is very small, basically no workpiece deformation.
During the cutting process, additional auxiliary vapor which is suitable for the material to be cut is also added. Oxygen is used as an auxiliary gas in the cutting of steel to produce an exothermic chemical reaction with the molten metal to oxidize the material while helping to blow away the slag in the slit. Cutting a class of polypropylene using compressed air, cotton, paper and other flammable materials using inert gas cutting. The auxiliary vapor entering the nozzle also cools the focusing lens to prevent dust from entering the lens holder and contaminating the lens and causing the lens to overheat.
Color of the laser The color of the laser depends on the wavelength of the laser, and the wavelength depends on the active material that emits the laser, that is, the material that produces the laser after being stimulated. The ruby can be stimulated to produce a deep rosy 5000mw laser pointer beam, which is used in the medical field, such as for the treatment of skin diseases and surgery. Argon gas, which is recognized as one of the most expensive gases, produces a blue-green laser beam, which has many uses, such as laser printing, and is indispensable in microsurgery. The laser produced by the semiconductor emits infrared light, so our eyes can not see, but its energy just to "read" the CD, and can be used for optical fiber communication. Laser separation technology Laser separation technology mainly refers to the laser cutting technology and laser drilling technology. Laser separation technology is to focus energy into a small space, access to 105 ~ 1015W / cm2 very high irradiation power density, the use of this high-density energy for non-contact, high-speed, high-precision machining methods. With such high optical power density, laser cutting and punching of virtually any material is possible. Laser cutting technology is a new kind of cutting method that can get rid of the traditional mechanical cutting and heat treatment cutting. It has higher cutting precision, lower roughness, more flexible cutting method and higher production efficiency. The laser drilling method, which is one of the methods for machining holes in solid materials, has become a processing technology with a particular application, mainly in the aerospace, aerospace and microelectronics industries.
The color of light is determined by the wavelength (or frequency) of light. A certain wavelength corresponds to a certain color. The wavelength range of sunlight is about 0.76 microns to 0.4 microns, corresponding to the color from red to purple a total of 7 colors, so the sun does not mention monochrome. Single-color light source known as the single-color light source, which emits a single wavelength of light. Such as krypton lamp, helium lamp, neon lamp, hydrogen lamp are monochromatic light source, only the emission of a certain color of light. Monochromatic light source although the wavelength of a single, but there is still a certain range of distribution. Such as the neon emission red light, monochromatic good, known as the highest single color, wavelength range is still 0.00001 nm, so neon red light, if carefully identified still contain dozens of red . It can be seen that the narrower the wavelength distribution of the optical radiation, the better the monochromaticity. The brightest laser pointer output light, the wavelength distribution range is very narrow, so the color is very pure. The output of red He-Ne laser, for example, the wavelength distribution of light can be narrowed to 2 × 10 ^ -9 nm, is the krypton lamp emitted red light wavelength distribution of two ten thousandths. Thus, monochromatic lasers far more than any one kind of monochromatic light source.
Laser has many characteristics: First, the laser is monochromatic, or is a single frequency. Some lasers can produce lasers of different frequencies at the same time, but these lasers are isolated from each other and are used separately. Second, the laser is coherent light. Coherent light is characterized by all of its light waves are synchronized, the whole beam is like a "wave train." Again, the laser is highly concentrated, that is to say it will take a long distance to the phenomenon of dispersion or convergence. Laser (LASER) is the last century 60's invention of a light source. LASER is the acronym for "amplified stimulated emission" in English. There are many kinds of lasers, ranging in size from a few soccer fields to a grain of rice or salt. The gas lasers include helium-neon lasers and argon lasers; solid-state lasers have ruby lasers; semiconductor lasers have 2000mw laser pointer diodes such as those found in CD players, DVD players, and CD-ROMs. Each of these lasers has its own unique method of generating lasers.
