Wet VS does type cut

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In several years of in the past, laser is more and more popular in a lot of application, because they are had,basically be flexible reach treatment rate. However, traditional today laser had reached their limit, in if brilliant circle delimits,face more accurate application a short while, can produce remarkable pollution, inferior productivity, and problem of quantity of heat. And a kind of new method can overcome these problems, rise through will stimulating beam of light to be united in wedlock with water knife. Through using water, cut deepness gets addition, pollution is prevented, hot influence also not answer existed. What the technical photograph that is based on laser with the tradition compares is different, water knife guided the success is scored in bringing laser to apply in what cannot finish through laser at present. Fundamental laser passes lens focusing, make the energy density that the focus is in enough ablation material. To material treatment, the focus controls a system to making laser correct action at it is necessary for workpiece, because depth of field is finite. Because this work area is less than 1mm generally speaking (see a picture 1, left) . Although this is right low power, a problem also is the laser of finite diffraction. Graph 1.

Traditional laser (left) guide laser with water knife (right) main distinction stimulates beam of light parallelly for creation, laser passes water focusing in nozzle, among them the degree of finish like silk of a hair, low-pressure water efflux is generated. Stimulate beam of light to be included completely to be in water knife, because total interior is reflexed in water / on air mind extent, be guided the bottom of cut, the energy loss that brings minimum only (see a picture 1, right) . The diameter of water knife does not change as its length, its length is efflux diameter probably 1000 times the left and right sides. Accordingly, work area should grow more for relatively traditional laser (the longest can amount to several centimeters) . Because do not need focal length control, can process moire body work consequently. The small cut of several millimeter width and deepness can be gotten, and cut brim is parallel. Because water knife guides the diameter that stimulates beam of light to be decided by the orifice diameter of nozzle only, result from normally in traditional Laser Cutting ellipticity of beam of light, the cut of astigmatism and polarization is abhorrent and directional depend on wait for a problem, here nonexistent. Traditional laser: Fuel factor and the laser that pollute successive wave form do not apply to accurate treatment in the center, because the power of laser centers another on bit, much quantity of heat arose to accumulate on material. Swash of arteries and veins is smooth, if reduced quantity of heat to accumulate, still can produce heat to affect an area (HAZ) , because every pulse accumulates quantity of heat,transmit data in the center. This one heat affects the negative effect that area place brings to have material oxidation, small break, the structure is out of shape, and low rupture intensity. Reduce pulse interval to be able to prevent heat to affect an area to form, but these phyletic laser are very slow on treatment speed, among the production that cannot use at large quantities of quantities accordingly. The 2nd main problem is pollution, because fuse,reach the material after condensing to still remain to reach cut surface in cut. To eliminate them, finite atmospheric pressure (20bar) auxiliary air current is in normally stimulate be generated near beam of light. But, this stretch flows not very effective, because only the gas of one fraction is penetrable enter cut. Besides cut around drossy, still have fused grain and evaporate material is in exterior deposit (see a picture 2) . What prevent pollution completely is exclusive a kind of means is protective coating is joined in cut process, but case of this one party normally disuse, because a few more additional measure can bring additional charge. Knife of water of traditional Laser Cutting guides type laser: Nondestructive machines means water knife to guide laser to use pulse laser, it is consequently between two laser pulse, water efflux undertakes cooling to cut brim. Because quantity of heat cannot be accumulated in material, hot influence area can be ignorred. Water efflux also is used at material to be taken out. This photograph is additional to gas take out means to want more effective, because water knife includes the kinetic energy of more advanced course. The material with fused great majority is kept clear of by water efflux, one fraction is only drossy put stay. To avoid deposit, in workpiece the surface can produce a very thin water film. The grain that falls on film cools very quickly and cannot felt is in the surface of workpiece (see a picture 3) . Use protection water film while cannot use traditional laser doing type, this basically stems from focal length sensitivity and power losing reason. Graph 3.

Because water efflux is very fine,water knife guides type Laser Cutting (normally the diameter arrives from 25 micron 75 micron) , its active force is very little on workpiece, even if with 500bar hydraulic (be less than 0.

1N) . Water quantity is used up also is very little (1 litre / minute) . Because have completely different feature, dry type and wet laser is two kinds of not similar techniques. These two kinds of technologies also are not used in identical application accordingly. Traditional laser is small to getting reach deep aperture very effective. Because water needs eduction, type laser technology guides like use water knife in this kinds of application consequently, of aperture deep wide be in than be being restricted 1 ∶ 1 the left and right sides. Laser of high power dry type guides type laser than water knife more businesslike on the treatment of low absorptivity material. E.g. , efflux of laser small water can cut off the biggest ply the sheet copper of 150 micron, and traditional Laser Cutting can pass quantity of heat to accumulate the cut with deep 1mm is made on same material. Besides this one example, because do not produce any fire damage, water knife guides laser to be able to process the data of a variety of types better than doing type laser. To cut and sculpture application, need smaller size and nondestructive injury, this respect is the strong point that water knife leads laser. The potential application domain of this one technology includes thin brilliant circle to delimit piece, armor plate reachs steel tube cut, and solar battery treatment. Fluidics suits laser small water very much likewise use at processing sensitive to heat or toxic material, if remember alloy Nitinol (nickel titanium Nuo) or GaAs (arsenic changes gallium) . The means that beam of light is formed and derives, and water refrigeration and clean effect, make laser water knife becomes a kind in domain of material small treatment cannot be equal to the tool that reach, it can pass much mode, the laser of power of high average output bundle, bring the treatment result of tall productivity and high quality. CNC Milling CNC Machining