1. Vaporization cutting: under the heating of the high power density laser beam, the surface temperature of the material rises to the boiling point temperature at a fast speed, enough to avoid the melting caused by heat conduction, so part of the material vaporizes into steam and disappears, and part of the material as ejecta is blown away from the bottom of the slit by the auxiliary gas flow.
2. Melting cutting: when the power density of the incident laser beam exceeds a certain value, the material at the irradiation point begins to evaporate, forming holes. Once the hole is formed, it absorbs all the energy of the incoming beam as a black body. The hole is surrounded by a wall of molten metal, and an auxiliary air stream coaxial with the beam carries away the molten material around the hole. As the workpiece moves, the hole moves horizontally synchronously in the cutting direction to form a slit. The laser beam continues to shine along the leading edge of the slit and the molten material is continuously or pulsating blown away from the slit.
3 oxidation melting cutting: melting cutting generally uses inert gas, if replaced by oxygen or other active gas, the material is lit under the irradiation of the laser beam, and oxygen occurs a fierce chemical reaction and produces another heat source, known as oxidation melting cutting.
4. Control fracture cutting: for brittle materials that are easy to be damaged by heat, high-speed and controllable cutting is carried out by laser beam heating, which is called controlled fracture cutting. The main content of this cutting process is that the laser beam heats the small area of brittle material, causing a large thermal gradient and serious mechanical deformation in the area, leading to the formation of cracks in the material. The laser beam can guide cracks in any desired direction as long as an even heating gradient is maintained.
Laser cutting technology has the following advantages:
First, high accuracy: positioning accuracy 0.05mm, repeated positioning accuracy 0.02mm.
Second, the slit is narrow: the laser beam is focused into a small spot of light so that the focus reaches a high power density, the material is heated to the degree of gasification, and the evaporation forms holes. With the relative linear movement of light beam and material, the holes continuously form a slit with a very narrow width. The incision width is generally 0.10-0.20 RAM.
Third, the cutting surface is smooth: the cutting surface has no burr.
Fourth, fast speed: cutting speed up to Lom/min, the maximum positioning speed up to 70m/m/ N, much faster than the speed of wire cutting.
Fifth, the cutting quality is good: no contact cutting, cutting edge affected by heat is very small, basically no workpiece thermal deformation, completely avoid the collapse of the edge formed when the material shear, slit generally do not need secondary processing.
Sixth, do not damage the workpiece: the laser cutting head will not contact the surface of the material, to ensure that the workpiece is not scratched.
Seventh, not affected by the hardness of the material to be cut: laser can be processed on steel plate, stainless steel, aluminum alloy plate, hard alloy, no matter what kind of hardness, can be deformation-free cutting.
Eighth, not affected by the shape of the workpiece: laser processing flexibility is good, can process arbitrary graphics, can cut pipe and other profiles.
Ninth, you can cut non-metal: such as plastic, wood, PVC, leather, textiles, plexiglass, etc.
Tenth, save mold investment: laser processing without mold, no mold consumption, no need to repair mold, save mold replacement time, thus saving processing costs, reducing production costs, especially suitable for the processing of large products.
Eleven, save materials: using computer programming, can be different shapes of the product for the whole board material cutting, maximize the utilization rate of materials.
Twelve, shorten the new product manufacturing cycle: new product trial production, the number is small, the structure is uncertain, will change at any time, simply can not out of the mold, laser cutting machine greatly shortened the new product manufacturing cycle, reduce the mold investment.
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