New energy vehicles are quieter than conventional internal combustion engine vehicles, and the development of new energy vehicles also puts forward stricter requirements for the control of tire noise. New energy vehicle tires can be better adapted to the needs of new scenarios by improving the rubber formula, tire aspect ratio, tire volume, tread material, tread pattern and other aspects.
Laser cleaning machine as a "green" cleaning process, in the quiet tire manufacturing process has a good application, the use of focused high-energy laser beams, irradiation of organic polymer material surface, so that the surface of the material undergoes physical and chemical changes, so as to change its properties. Can effectively improve the quality of tires and production process, enhance the compatibility of tires and car body, improve the overall performance of the vehicle. By coating the inner wall of the tire with soft solid gel polymer composite material, it can realize the function of anti-explosion, anti-puncture and anti-leakage, and at the same time, a layer of polyurethane sponge is pasted on the surface of the anti-leakage rubber, which can realize the mute effect of acoustic and thermal insulation, and absorbing the noise of the cavity.
Laser cleaning can effectively isolate the residual isolation agent on the inner wall of the tire, and improve the coating of the composite material and the adhesion of the polyurethane sponge. The cleaning process does not use consumables, no damage to the tire, high efficiency, good consistency, and can be automated cleaning.
Through the selection of pulsed laser equipment, sample parts are evaluated by developing a reasonable process flow. The surface tension values under different parameters were obtained by Dain Pen test. The results show that different process parameters (laser energy density, processing efficiency) will have an impact on the surface tension of the inner wall of the tire, for the production process of quiet tires should be reasonably formulated process parameters. Through the test, the laser cleaning is uniform and meets the substrate damage far to meet the requirements. After cleaning the inner surface friction coefficient increased >37mN/m, surface tension reached 40dyne/cm.
Use the roughness tester to test the surface after laser treatment, the area is S1-S4, corresponding to different process parameters, the test standard is ISO1997, the curve is R, and the filter is GAUSS. the results show that the different parameters have different degrees of influence on the surface roughness, and the roughness in the S3 area is the largest, which is in line with the results of the Dain Pen test, and the laser treatment greatly increases the surface roughness.
Observation at 1000x reveals a large number of universally distributed small concave patches with micron-sized particles where the laser irradiated, when the laser strikes the surface of the substance, it destroys the rubbery chain-like structure and produces this irregular concave feature to increase the surface roughness.
