Obrabotka Metallov. 2016 no. 1(70)

ОБРАБОТКА МЕТАЛЛОВ № 1 (70) 2016 20 ТЕХНОЛОГИЯ Physics D: Applied Physics. – 2006. – Vol. 39, N 19. – P. 4236–4244. – doi: 10.1088/0022-3727/39/19/017. 9. Ermolaev G.V., Kovalev O.B . Simulation of sur- face profile formation in oxygen laser cutting of mild steel due to combustion cycles // Journal of Physics D: Applied Physics. – 2009. – Vol. 42, N 18. – P. 185506. – doi: 10.1088/0022-3727/42/18/185506. 10. Оришич А.М., Фомин В.М . Актуальные про- блемы физики лазерной резки металлов. – Новоси- бирск: Изд-во СО РАН, 2012. – 176 с. – ISBN 978-5- 7692-1212-3. 11. Experimental study of laser-oxygen cutting of low-carbon steel using fibre and CO 2 lasers under condi- tions of minimal roughness / A.A. Golyshev, A.G. Ma- likov, A.M. Orishich, V.B. Shulyatyev // Quantum Electronics. – 2014. – Vol. 44, N 10. – P. 970–974. – doi: 10.1070/QE2014v044n10ABEH015412. 12. Mahrle A., Beyer E . Theoretical aspects of fibre laser cutting // Journal of Physics D: Applied Physics. – 2009. – Vol. 42, N 17. – P. 175507. – doi: 10.1088/0022- 3727/42/17/175507. 13. Malikov A.G., Orishich A.M., Shulyat’ev V.B. Experimental optimisation of the gas-assisted laser cut- ting of thick steel sheets // Quantum Electronics. – 2009. – Vol. 39, N 6. – P. 547–551. – doi: 10.1070/QE2009v- 039n06ABEH014040. 14. Mechanical characteristics of high-quality laser cutting of steel by fiber and CO 2 lasers / V.M. Fomin, A.A. Golyshev, A.G. Malikov, A.M. Orishich, V.B. Shu- lyatyev // Journal of Applied Mechanics and Techni- cal Physics. – 2015. – Vol. 56, iss. 4. – P. 726–735. – doi: 10.1134/S0021894415040203. 15. High-quality beam generation in a 8-kW cw CO2 laser / Yu.V. Afonin, A.P. Golyshev, A.I. Ivanchenko, A.N. Malov, A.M. Orishich, V.A. Pechurin, V.F. Fi- lev, V.B. Shulyat’ev // Quantum Electronics. – 2004. – Vol. 34, N 4. – P. 307–309. – doi: 10.1070/QE2004v- 034n04ABEH002671. OBRABOTKAMETALLOV (METAL WORKING AND MATERIAL SCIENCE) N 1 (70), January – March 2016, Pages 16–21 Standardization of oxygen-assisted laser cutting by the surface roughness criterion Golyshev A.A., Ph.D. student, Junior researcher, e-mail: alexgol@itam.nsc.ru Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, 4/1 Institutskaya str., Novosibirsk, 630090, Russian Federation Abstract Laser cutting technology rightly ranks highly in the range of many common types of metals mechanical cutting. High density of laser radiation power permits cutting metal and non-metal materials of different thickness. Low cut width, high speed of processing, and accuracy are the peculiarities of the laser-cutting technology. In spite of many advantages, opposite to the other technologies, the laser cutting still has no position in the processing quality standard system. The paper deals with the investigation of the oxygen-assisted laser cutting of low-carbon steel by the gas- discharge CO 2 laser and ytterbium fiber laser with the radiation wave length of 10.6 μm and 1.07 μm, respectively. The sheets of 3, 5, 10, and 16 mm were cut. The laser radiation was assigned as 200 W per 1 mm of the sheet thick- ness for the both laser types. Initial stage was to optimize the laser cutting by the criterion of the minimal surface roughness. It is shown that the striated structure of the side surface of the cut is not uniform and has its features in the top and bottom parts of the samples. To define the cut quality class, the roughness value measured in the bottom part was used. It is found that the gen-assisted laser cutting of low-carbon steel by the CO 2 laser shows the better quality of the cut surface as compared with the treatment by the ytterbium fiber laser. It is also obtained that the laser cutting of low-carbon steel correlates to the 4 – 6 class of roughness. We founded that, as the cut sheet thickness rises, the roughness value changes in accordance with the law R z = 1,15 t + 6,5 for the cutting by the СО 2 -laser and R z = 3,7 t + 3,8 for the cutting by the ytterbium fiber laser. Keywords: laser cutting, surface roughness, СО 2 -laser, ytterbium fiber laser. DOI: 10.17212/1994-6309-2016-1-16-21