Abstract
Cold-rolled steel sheets with specially designed surface topographies are widely in applications in car and fabrication industry. Laser texturing is a novel technique used to texture the cold roller surface to produce high quality steel sheets with good formability and image clarity. Principle of multi-head CO2 laser surface texturing technique using polygon scanner for beam modulation is introduced. Texturing parameters and their influence are investigated. The obtained craters are of volcano shape with diameter of 120~230?m, depth of 7~21?m and bump height of 5~17?m. The surface average roughness Ra is in the range of 1.03~5.86?m. The textured surface is abrasive resistant and prolongs the roller service life.
Highlights
With an aim to increase the texturing efficiency to meet the industrial needs and improve the quality of roller surface texturing, Laser texturing is proposed to texture the cold roller surface to produce high quality steel sheets with good formability and image clarity
With several heads texturing simultaneously, its efficiency can be compared to EDT (Electrical Discharge Texturing) (Simão, 1994, pp.207-214) without having roughness fluctuation and decreasing image clarity when textured in low Ra value (Scheers, 1998, pp.647-656)
The revolving speed of mill roller is 50rpm, and the corresponding rotating speed of polygon scanner driven by an electric motor is 8000rpm, producing output pulse rep-rate of 10 kHz
Summary
With an aim to increase the texturing efficiency to meet the industrial needs and improve the quality of roller surface texturing, Laser texturing is proposed to texture the cold roller surface to produce high quality steel sheets with good formability and image clarity. Laser texturing of mill roller is using a rotating chopper for beam modulation and the output pulse rate is 10 kHz (Wan, 2008, pp.309314). In order to meet the industrial requirements and improve the surface quality of a textured roller by CO2 laser processing, a novel CO2 laser texturing system using polygon scanner for beam modulating is proposed (Zhou, 2009, pp.607610). To achieve more appropriate surface topographies, microstructure and mechanical properties, experiments and analysis on the area of multi-head laser textured surface are conducted. This work will be of practical significance to the promotion of multi-head CO2 laser surface texturing technique
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