Obrabotka Metallov 2015 No. 4

ОБРАБОТКА МЕТАЛЛОВ № 4 (69) 2015 59 ОБОРУДОВАНИЕ. ИНСТРУМЕНТЫ widths 180, 190, 220, 250 and 330 cm were determined more precisely using SolidWorks CAD system and finite- element CAE complex ANSYS. The first frequency varies in the range from 24.9 Hz (STB-180 loom) to 17.7 Hz (STB-330 loom), second frequency varies from 26.7 Hz to 20.8 Hz, and the third one varies from 54.8 Hz to 25.2 Hz. It is demonstrated that the technological loading from tension of warp fibers can be presented as loading from static force from preliminary tension of the mobile ram spring and dynamic component depending on operation of the machine mechanisms. It is also demonstrated that load-carrying systems of looms under certain operational conditions can approach resonance conditions. Movements of individual elements in load-carrying systems caused by technological loading presented by a Fourier series are determined. The obtained results make it possible to develop specific recommendations for discrimination of assortment ranges of STB looms in accordance with the requirements to hygiene and sanitary conditions during work on this equipment. During design of technological equipment, it is suggested to use technological loading in the form of a sinusoidal pulse with the period equal to turnaround time of the loom main shaft and amplitude equal to the static component of the acting force for chosen fabric assortment. Using the frequency spectrum of forced vibrations obtained by expansion of the technological loading in a Fourier series, it is suggested to develop constructions of load-carrying systems from the ratio between frequencies of forced and free vibrations equal to three or higher. Keywords : load-carrying system, technological machine, finite-element method, the frequency spectrum of intrinsic vibrations, the technological loading, series of STB looms, forced vibrations, resonance. DOI: 10.17212/1994-6309-2015-4-51-60 References 1. Podgornyj Yu.I. Metody issledovaniya zapravok, ikh sintez i razrabotka kriteriev optimal’nosti uslovii eksplua- tatsii tkatskikh stankov pri formirovanii plotnykh tkanei. Diss. dokt. tekhn. nauk [Research methods refills, their synthesis and development of criteria of optimality conditions looms in the formation of dense tissue. Dr. eng. sci. diss.]. Kostroma, 1990. 541 p. 2. Podgornyj Yu. I., Afanas’ev Yu.A., Kirillov A.V. Issledovanie i vybor parametrov pri sinteze i ekspluatat- sii mekhanizmov tekhnologicheskikh mashin [Research and selection of parameters in the synthesis and operation mechanisms of technological machines]. Novosibirsk, NSTU Publ., 2002. 196 p. 3. Atapin V.G. Mnogourovnevoe proektirovanie korpusnykh konstruktsii mnogotselevykh stankov [Multi-level design of hull structures of multipurpose machine tools]. Vestnik mashinostroeniya – Russian Engineering Research , 1999, no. 1, pp. 9–12. (In Russian) 4. Atapin V.G. Proektirovanie nesushchikh konstruktsii tyazhelykh mnogotselevykh stankov s uchetom tochnosti, proizvoditel’nosti, massy [Structural design of heavy multipurpose machine tools, taking into account the accuracy, performance, weight]. Vestnik mashinostroeniya – Russian Engineering Research , 2001, no. 2, pp. 3–6. (In Russian) 5. Atapin V.G. Optimizatsiya nesushchei sistemy stola tyazhelogo mnogotselevogo stanka [Optimization of the support system of heavy multipurpose machine tool]. Obrabotka metallov (tehnologiya, oborudovanie, instrumen- ty) – Metal Working and Material Science , 2006, no. 4 (33), pp. 30–32. 6. Atapin V.G. Metod dekompozitsii v proektirovanii mnogotselevykh stankov [Decomposition method in design of multifunctional machines]. Obrabotka metallov (tehnologiya, oborudovanie, instrumenty) – Metal Working and Material Science , 2014, no. 1 (62), pp. 61–68. 7. Kirilin Yu.V., Eremin N.V. Issledovanie nesushchei sistemy stanka metodom konechnykh elementov [Study of the support system of the machine tool using finite element method]. STIN – Russian Engineering Research , 2002, no. 8, pp. 19–21. (In Russian) 8. Kirilin Yu.V., Dyshlovenko P.E., Eremin N.V. Modelirovanie podvizhnogo i nepodvizhnogo styka metal- lorezhushchego stanka [Simulation of swing and fixed joint of machine tool]. STIN – Russian Engineering Research , 2003, no. 9, pp. 22–28. (In Russian) 9. Kirilin Yu.V. Sovershenstvovanie nesushchikh sistem frezernykh stankov na osnove ikh modelirovaniya i ra- scheta dinamicheskikh kharakteristik. Diss. dokt. tekhn. nauk [Improvement of bearing systems of milling machines based on their modeling and calculation of dynamic characteristics. Dr. eng. sci. diss.]. Ul’yanovsk, 2006. 345 p. 10. Chernyanskii P.M., ed. Proektirovanie avtomatizirovannykh stankov i kompleksov. V 2 t. T. 1 [Design of au- tomated machine tools and complex machines. In 2 vol. Vol. 1]. 2 nd ed. Moscow, Bauman MSTU Publ., 2014. 336 p. ISBN 978-5-7038-3810-5