Obrabotka Metallov 2015 No. 1

ОБРАБОТКА МЕТАЛЛОВ № 1 (66) 2015 31 ТЕХНОЛОГИЯ Journal of Materials Processing Technology. – 2004. – Vol. 149, iss. 1–3. – P. 609–615. – doi: 10.1016/j. jmatprotec.2004.02.024. 8. Direct selective laser sintering of iron- graphite powder mixture / K. Murali, A.N. Chatterjee, P. Saha, R. Palai, S. Kumar, S.K. Roy, P.K. Mishra, A.R. Choud­ hury // Journal of Materials Processing Technology. – 2003. – Vol. 136, iss. 1–3. – P. 179–185. – doi: 10.1016/ S0924-0136(03)00150-X. 9. Olevsky E.A., German R.M. Effect of gravity on dimensional change during sintering–I. Shrinkage an- isotropy // Acta Materialia. – 2000. – Vol. 48, iss. 5. – P. 1153–1166. – doi: 10.1016/S1359-6454(99)00368-7. 10. An experimental design approach to selec- tive laser sintering of low carbon steel / A.N. Chatter- jee, S. Kumar, P. Saha, P.K. Misha, A.R. Choudhury // Journal of Materials Processing Technology. – 2003. – Vol. 36, iss. 1–3. – P. 151–157. – doi: 10.1016/S0924- 0136(03)00132-8. 11. Лазерные технологии обработки матери- алов: современные проблемы фундаментальных исследований и прикладных разработок: моногра- фия / В.Я. Панченко, В.С. Голубев, В.В. Васильцов, М.Г. Галушкин, А.Н. Грезев. – М.: Физматлит, 2009. 664 c. – ISBN 978-5-9221-1023-5. 12. Патент на изобретение 2268493 Российская Федерация, МПК 7 G 06 T 17/20, G 06 T 17/40. Способ лазерно-компьютерного макетирования / А.А. Са- прыкин, С.И. Петрушин, Н.А. Сапрыкина; патен- тообладатель Томский политехнический универси- тет. – № 2004119122/09; заявл. 24.06.2004; опубл. 20.01.2006, Бюл. № 02. – 5 с. 13.  Saprykina N.А., Saprykin А.А. Engineering sup- port for improving quality of layer-by-layer laser sinter- ing // The 7th International Forum on Strategic Tech- nology IFOST2012, September 18–21, 2012. – Tomsk: TPU Press, 2012. – P. 129–132. 14. Спиридонов А.А. Планирование эксперимента при исследовании технологических процессов. – М.: Машиностроение, 1981. – 184 c. 15.  Saprykina N.А., Saprykin А.А. Improvement of surface layer formation technology for articles pro- duced by layer-by-layer laser sintering // Applied Me- chanics and Materials. – 2013. – Vol. 379. – P. 56–59. – doi: 10.4028 /www.scientific.net/AMM.379.56. OBRABOTKAMETALLOV (METAL WORKING AND MATERIAL SCIENCE) N 1(66), January – March 2015, Pages 27–32 The research of the effect of laser sintering modes on the thickness of the sintered cobalt-chromium-molybdenum powder layer Saprykina N.A. , Ph.D. (Engineering), Associate Professor, e-mail: nat_anat_sapr@mail.ru Yurga Institute of Technology, TPU Affiliate, 26 Leningradskaya Street, Yurga, 652055, Russian Federation Abstract In the modern economic paradigm to reduce the term of the new product launch the technology of layer-by-layer laser sintering is used. Technological development is moving towards the introduction of new powder materials and definition of rational technological modes of formation of the surface layer of a given quality. The creation of applicative product is possible only within a certain range of laser exposure, which is chosen experimentally for particulate material. The accuracy of the product is greatly influenced by the layer thickness. The results of experimental studies of the effect of technological modes of powder materials sintering (the laser power, the velocity of the laser beam scanning step, pre-heating temperature of the powder material) on the thickness of the sintered cobalt-chromium-molybdenum powder layer. The studies are conducted using the technological laser complex for formation of the surfaces of the parts with a complex spatial form. The thickness of the sintered layer is determined by a specially developed technique using a digital engineer microscope. The mathematical dependence of the thickness of the sintered surface layer on cobalt-chromium-molybdenum powder sintering conditions based on the theory of experimental design and statistical treatment of results is obtained. Graphs with superposition of experimental values of the sintered layer thickness depending on the sintering conditions are plotted using mathematical relationship. Characteristic curves analysis identifies the relevant modes parameters: lasing power, laser beam traversing speed, laser beam scanning step. All these parameters affect the thickness of the sintered layer and also limits its change from 0,65 to 1 mm by increasing the laser power from 10 to 20 watts; from 0,65 to 0,88 mm by reducing the moving