Obrabotka Metallov 2014 No. 3

ОБРАБОТКА МЕТАЛЛОВ № 3 (64) 2014 66 ТЕХНОЛОГИЯ Abstract The prospects of using high-precision plasma cutting of the layered compositions “steel Ст3 + steel 12Х18Н10Т” received by explosion welding are identified. The rationale for the selection of technological schemes to optimize the mode parameters for accuracy, cut quality and burr formation is given. The inadvisability of using technologi- cal scheme Hi-FocusF, realizable at a maximum current mode (130 A) as not providing sufficient quality cut is demonstrated experimentally. The scheme of experiments to optimize the processing, which suggests of using the technological scheme Hi-Focus plus , recommended for carbon steel cutting, and scheme Hi-Focus for alloyed steels when cutting both the steel component and alloy is proposed. Peculiarities of cut geometry formation when cutting steel 12Х18Н10Т side by technological scheme Hi-Focus with current mode I = 45 A for alloyed steels in processing speed range of 1,1 to 1,5 m / min are identified. The optimal value of the speed V = 1,2 m / min, providing optimum cutting quality with minimum burr are identified. Start cutting from the carbon steel side leads to the change in the character of the cut geometry. The presence of 3 specific areas in the cross section of cut is observed and quantitative estimation of the accuracy when the processing speed changed is given. Using technological scheme Hi-Focus plus for cutting bimetallic composition allows to determine the optimal val- ues of the processing speed (V = 1,7 m / min) during cutting steel Ст 3 ensure minimal deviation from perpendicular- ity of the cut. It is noted that using the technological scheme Hi-Focus plus for bimetallic composition cutting on both side is not accompanied by burr forming on the bottom edge of the cut. The study of the cut surface quality showed of the low surface roughness (Ra = 1,2 - 1,6 mm) and its good to- pography. Keywords: high-precision plasma cutting, bimetallic connections, accuracy and cutting quality, technological schemes, carbon and alloyed steels. References 1. Deribas A.A., Grigoryan S.S. Fizika uprochneniya i svarki vzryvom. 2-e izd. [Physics of hardening and explosion welding]. 2 nd ed. Novosibirsk, Nauka Publ., 1980. 221 p. 2. Zakharenko I.D. Svarka metallov vzryvom [Metal welding explosion]. Minsk, Navuka i tjehnika Publ., 1990. 205 p. 3. Svarka vzryvom i svoistva svarnykh soedinenii. Mezhvuzovskii sbornik nauchnykh trudov. [Explosion welding and properties of welded joints. Interuniversity collection teach works]. Volgograd, VolgGTU Publ., 2000. 128 p. 4. Zlobin B.S. Svarka vzryvom stali s alyuminiem [Explosion Welding of Steel with Aluminum]. Fizika goreniya i vzryva – Combustion, Explosion, and Shock Wave , 2002, vol. 38, no. 3, pp. 137-140 (in Russian). 5. Sukhanov D.A. Povyshenie konstruktivnoi prochnosti stalei formirovaniem tonkodispersnoi sloistoi struktury . Diss. kand. tekhn. nauk [Increase the structural strength steels forming fine layered structure. Dr. tech. sci. diss.]. Novosibirsk, 2002. 198 p. 6. Handbuch zum Thema Plasmaschneiden [eine elektronische Ressource]. Werkstatt Ausrüstung Leitner Josef. Salzweg, 2002. 66 s. Zugriffsmodus: htpp://www.wal-austria.at/pdf/wissenswertes/handbuch_ plasmaschneiden.pdf. Der Titel Bildschirm. 7. Shirshov I.G., Kotikov V.N. Plazmennaya rezka [Plasma cutting]. Leningrad, Mashinostroenie Publ., 1987. 192 p. 8. Grigor’yantsA.G., Shiganov I.N., MisyurovA.I. Tekhnologicheskie protsessy lazernoi obrabotki [Technological processes of laser machining]. 2 nd ed. Moscow, BMSTU Publ., 2008. 664 p. 9. Loktionov A.A., Zakharov V.V. [Trickle plasma cutting as an effective technology in the blank production]. Nauka. Tekhnologii. Innovatsii: Materialy Vserossiiskoi nauchnoi konferentsii molodykh uchenykh, 2-4 dekabria 2011 g. v 6 chastiakh [Proceedings of All-Russian scientific conference of young scientists “Science. Technologies. Innovations”, 2-4 December 2011 in 6 parts]. Novosibirsk, NSTU Publ., 2011, pt. 2, pp. 29-30 (in Russian). 10. Rakhimianov Kh.M., Loktionov A.A. [Impact of technology trickle plasma cutting on the formation of the surface roughness of the cut]. Sbornik nauchnykh trudov 7 Mezhdunarodnoi nauchno-tekhnicheskoi konferentsii “Sovremennye problemy mashinostroeniia” [Collection of Scientific Papers 7th International Scientific-Technical Conference “Modern Problems of Engineering”, Tomsk, 11-13 November 2013]. Tomsk, TPU Publ., 2013, pp. 349- 353 (in Russian). 11. Rakhimianov Kh.M., Loktionov A.A. [Analysis of errors in forming trickle plasma cutting metal materials]. Sbornik trudov Vserossiiskaia nauchno–prakticheskaia konferentsiia “Sovremennye problemy v tekhnologii mashinostroeniia”, posviashchennaia 100-letiiu so dnia rozhdeniia professora Mukhanova I.I. [Proceedings of