Obrabotka Metallov 2014 No. 1

ОБРАБОТКА МЕТАЛЛОВ № 1 (62) 2014 68 ОБОРУДОВАНИЕ OBRABOTKAMETALLOV (METAL WORKING • MATERIAL SCIENCE) N 1(62), January – March 2014, Pages 61–68 Decomposition method in design of multifunctional machines Atapin V.G., D.Sc. (Engineering), Professor, e-mail: metal_working@mail.ru Novosibirsk State Technical University, 20 Prospect K. Marksa, Novosibirsk, 630073, Russian Federation Received 10 September 2013 Revised 25 January 2014 Accepted 15 February 2014 Abstract The main purpose of designing of supporting constructions of heavy multifunctional machines is the reduction of mass at the given precision and productivity of working. To achieve this objective, the technology of rational design of supporting constructions offered by us uses the decomposition method and the finite elements method in combination with optimization methods. The technology has four stages: 1) calculation (computation) of external all forces and loads, 2) as a result of the boundary conditions (force, kinematics) for individual supporting constructions are formed, 3) the problem of the final optimal distribution of a material by the individual supporting constructions with the real cross-section is solved; 4) dynamic analysis. Due to the large-scale computational model of the machine bearing system, consisting of a consistent set of interconnected basic details, on a design stage it is proposed to use the substructure, derived from the basic details. On the example of designing heavy machining center column it is shown that the application of the substructure significantly reduces the dimensionality of the model and the time of an actual design of the base detail. Strain field of the optimal column substructure is consistent with the strain field of columns, which is obtained when calculating the machine carrying system, consisting of basic details of a simplified column while coming up to the precision standards of machining. The turning angle of the optimal column with real cross-section is less than the column as part of the support system with simplified geometry for basic items - 0.0778 rad and 0.1495 rad, respectively, i.e. torsional stiffness of the optimal column is higher. Keywords: Heavy multifunctional machines; Design; Decomposition method; Supporting constructions; Finite elements method; Optimization methods. References 1. Kaminskaja V.V., Levina Z.M., Reshetov D.N. Staniny i korpusnye detali metallo-rezhushhih stankov [Machine beds and case parts of machine tools]. Moscow, Mashgiz Publ., 1960. 362 p. 2. Rao, Grandi. Trudy AOIM “Konstruirovanie i tehnologija mashinostroenija” [Trans. ASME “Designing and technology of engineering”]. 1983. Vol.105, no. 2, pp. 206–211. 3. Esimura, Takjeuti, Hitomi. Trudy AOIM: Konstruirovanie i tehnologija mashinostroenija [Trans. ASME “Designing and technology of engineering”]. 1984. Vol.106, no 4, pp. 213–220. 4. Homjakov V.S., Jackov A.I. Stanki i instrument , 1984, no. 5, pp.14–16. 5. Atapin V.G. Vestnik mashinostroenija , 2001, no 2, pp. 3 – 6. 6. Reklaitis G.V., Ravindran A., Ragsdell K.M. Engineering Optimization. John Wiley and Sons, Inc., New York. 1983. 7. Atapin V.G. Obrabotka metallov (tehnologija, oborudovanie, instrument) , 2011, no. 3 (52), pp. 27–34. 8. Atapin V.G. Obrabotka metallov (tehnologija, oborudovanie, instrument) , 2012, no. 1 (54), pp. 56–63. 9. Atapin V.G., Gaponov I.E., Pavin A.G. Avtomatizacija proektirovanija tjazhelyh mnogocelevyh stankov [Design automation of heavy machining centers]. I Vsesojuznyj s#ezd tehnologov-mashinostroitelej [First All-Union Congress of Technology – Mechanical Engineers]. Moscow, 1989, pp. 42–43. 10. Atapin V.G. Obrabotka metallov (tehnologija, oborudovanie, instrument) , 2012, no. 2 (55), pp. 27–32.