Saturday, March 31, 2012

The peak of the convex part of the passivation faster

With a laser method of hair of this roll, the material of the surface laser irradiation region will produce a residual tensile stress due to thermal expansion and contraction of the fused X-ray stress measurement results showed that the laser irradiation area (pit) of density to a certain extent, this uniform distribution of tensile stress is indeed effective relaxation rolling the roller surface of the original strong compressive residual stress, so that the surface of the roll toughening. Laser texturing roller of the rolling strip surface roughness Ra changes for rolling early (about 15%) of the amount of rolling, the surface roughness decreased rapidly after slowing down, mainly with laser texturing roller The surface morphology. The beginning of the laser texturing roller stage, the peak of the convex part of the passivation faster. The code pair of the receiver of    green laser pointer    has been finished.
Period of time, the convex part of the blunt, reduce the amount of wear of the corresponding laser hair roll. Convex part of the peak height and shape of the convex pit and so can be controlled by changing the texturing process, which use laser texturing roller will not change due to roughness of leaving rolling conditions change greatly. The life of the laser hair roll with cold rolling reduction rate of cold varies with the material and its hardness. Industrial applications show that after cold rolling work rolls laser texturing, its use of performance and service life are significantly improved. 2O roll Sendzimir mill with its cold-rolled low carbon steel plate, laser hair and roll life of more than three times higher than ordinary rolling roll; in the ordinary two-roll mill, cold-rolled high-strength laser texturing roll (σb ≥ 800 MPa) 65Mn spring steel, the life of ordinary roll of 2 or 3 times. After finishing the code pair process, all receivers of    green laser pointer   will store the same address code.
Annealing of low carbon mild steel with its formation, its service life than ordinary rolling rolls increased by more than 2 times, and some even up to 10 times, depending on the control of the product surface roughness. Improve the performance of the product. Laser texturing board to improve the deep drawability due to the low friction coefficient, and both good lubrication ability and ease of collection ideal for abrasive micro-pits, and thus has an excellent stamping performance. In the same molding conditions, with the same surface roughness of the sheet, laser texturing plate stamping mobility. Analysis: the micro-pit grooves in the plate surface of the laser texturing the high dislocation density of the grain, the original slip line can not start, prompting other grains began to slip. Here will show the match burning of high power    green laser pointer   .
Is the board surface micro-pits (plastic deformation) on the slip of this blocking and dispersion effect, delaying the micro-crack initiation and development, so that the elongation of the plate to improve. On the mechanical properties of the shot peening of the same material texturing plate and laser hair plate test showed that laser texturing plate yield strength decreased by 6-7%, the tensile strength increased by 7%, the total elongation increased 6 ~ 10%, laser hair of the board is more conducive to stamping. On the SPCC (Beijing Jeep plant test), laser textured steel yield strength decreased 2O ~ 30 MPa, tensile strength increased 2lMPa elongation of more than 1O%; In recent years, a new generation of batteries shell gradually switch to sheet metal stamping . This high rate of shell production, the effect is good. Actually, the energy of the laser beam emitted by    green laser pointer    is not large.
But stamping is difficult, demanding performance on the plate. Laser hair technology developed for battery shell laser hair surface strip stamping effect. Anshan Iron and Steel Company 08F laser hair precision strip (thickness 0.24mm) in the battery production, product depth to diameter ratio of 4.8. Improve coating performance and distinctness of image due to the precise form of the role of laser texturing, laser texturing plate surface roughness even, rarely wave degrees, but also conducive to uniform adhesion of the coating material, so the paint surface brightness is significantly higher than the spray pills hair of the board. Laser texturing of roll surface may retain a larger flat bright part (up to 60%), flat plate surface of the steel plate rolling out high distinctness of image of the strip surface finish and painted degrees. The laser light of   green laser pointer irradiates pointing to one direction.

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