THE SIGNIFICANCE OF THE BACK TENSION USAGE IN CROSS-SECTIONAL TUBE DRAWING PROCESS

Transcription

1 THE SIGNIFICANCE OF THE BACK TENSION USAGE IN CROSS-SECTIONAL TUBE DRAWING PROCESS INFORMATION ABOUT THE PAPER IN ENGLISH Okulov Roman Alexandrovich Postgraduate Student, Ural Federal University named after the first President of Russia B.N. Yeltsin, Yekaterinburg, Russia. Parshin Sergei Vladimirovich D.Sc. (Eng.), Professor, Ural Federal University named after the first President of Russia B.N. Yeltsin, Yekaterinburg, Russia. Abstract. The article is devoted to the problem of current interest that is the study of resulting products geometry and power parameters of the drawing process dependence on the use of back tension force. The work was performed by the software using the finite element method and was practically experimented. The results of theoretical and practical parts are in good agreement. As a result of this work the required dependencies have been defined and valuable recommendations to producers have been given. Keywords: drawing, back tension, steel XCrNiTi18-10, crosssectional tube. References 1. Perlin I.L., Ermanok M.Z. The theory of drawing. Moscow, 1971, 8 p.. Danchenko V.N., Sergeev V.V., Nikulin E.V. Production of shaped pipes. Moscow: Intermet Engineering, 3, p. 3. Orlov G.A., Vagapov E.N., Chernyshev D.U., Popov D.A. Some of the technological capabilities of the roller tube drawing. Production of steel. 01, no., pp Bogatov A.A., Mizhiritsky O.I., Smirnov S.V. Resource ductility metal processing pressure. Moscow: Metallurgy, 198, 1 p. 5. Okulov R.A., Parshin V.S., Karamyshev A.P. Energy intensity of treatment rivet wire drawing of duralumin and radial compression. Bulletin of mechanical engineering. 01, no. 9, pp ,.,.,...,., -., 10, V0.,,,. :, Ti-Al-V,,,. -,, -. -,, -, , [1], [] [3]., []. - [5] -.,

2 .,.,., Ti-Al-V (Al,0%, V,0%, Fe 0,%, O 0,%, 0,08%, N 0,05%, 0,015%), 1,, (. 1)., 50 C, -, -., Tensile strength [MPa] Tensile strength Elongation Heating temperature,, T [ºC], Elongation /% %. 1.,, : 5.,. CNC ,.., 0,, t, 0; 3;, / 1, A/ 1,5 T, C th, Blankholder Electrode clamp Blank Copper electrode Insulator Die Punch , -. -., -, -,,. 0, , -

3 . Heating temperature,, T [ºC] Bending area , Distance from edge [mm] = (. 5). - -,. (a), Furnace heating, t h = 0 t h = c 0 s. (b), Resistance heating, t h = t h 8 = c 8 s.. 5. = 880 t = (a) Example of reflective lighting for cracks (b) T=50 = 50 ºC 90 ºC 790 ºC 880 ºC.. t = , = 880,5 ( ) 1,8., Bending load [kn] Fracture Heating temperature, T [ºC]. 7. t =

4 .,.,., , HV0. m Springback angle, [º] Radius Springback Heating temperature,, T [ºC]. 8. t = 3, Corner radius /mm» = Springback angle, [º] Springback Radius Holding time t, t [s] c Corner, radius /mm. 9. = ,. 10.,,, = 10, = , (a) As-received (b) T = 880 ºC (c) T = 10 ºC. 10., - = 880 -, -., Vickers hardness [HV0] 0V As-received Punch corner x 785 ºC T=5 ºC 880 ºC Contact Die with corner electrode Distance from centre, x [mm] ,. 1,,, -. -, -,. 1,. -, - FEM ANSYS., -.,. 13,, 7-85 ± 0,. 13,

5 Electrode Low density High density (a) Parallel electrodes Electrode Similar density (b) Inclined electrodes Electrode Electrode - Ti-Al-. - -, , ,5 1, , 85 ± 0. Bending area [ºC] (a) Parallel electrodes [ºC] (b) Inclined electrodes 1. Mori K., Maki S., Tanaka Y. Warm and hot stamping of ultra-high tensile strength steel sheets using resistance heating, CIRP Annals Manufacturing Technology, 5-1 (5), Mori K., Okuda Y. Tailor die quenching in hot stamping for producing ultra-high strength steel formed parts having strength distribution, Annals of the CIRP Manufacturing Technology, 59-1 (010), Mori K., Maeno T., Fukui Y. Spline forming of ultra-high strength gear drum using resistance heating of side wall of cup, CIRP Annals Manufacturing Technology, 0-1, (011), Mori K., Maeno T., Fuzisaka S. Punching of ultra-high strength steel sheets using local resistance heating of shearing zone, Journal of Materials Processing Technology, 1- (01), Ozturk F., Ece R.E., Polat N., Koksal A. Assessment of electrical resistance heating for hot formability of Ti-Al-V alloy sheet, Key Engineering Materials, 73 (011), ,,.,,. mori@plast.me.tut.ac.jp.,,.,,. HOT STAMPING OF TITANIUM ALLOY SHEET USING RESISTANCE HEATING INFORMATION ABOUT THE PAPER IN ENGLISH Hamedon Zamzuri Mechanical Engineering Department, Toyohashi University of Technology, Aichi, Japan. Mori Ken-ichiro Professor, Mechanical Engineering Department, Toyohashi University of Technology, Aichi, Japan. mori@plast.me.tut.ac.jp. Maeno Tomoyoshi Mechanical Engineering Department, Toyohashi University of Technology, Aichi, Japan. YamashitaYuya Mechanical Engineering Department, Toyohashi University of Technology, Aichi, Japan. Abstract. A hot stamping process of a titanium alloy sheet using resistance heating was developed to improve the productivity. As the heating temperature increased, the bending load decreased and the titanium alloy sheet was successfully formed at elevated temperatures. As the heating temperature increased, the springback of the bent sheet decreased. Although needle-shaped martensite appeared at a heating temperature of 10 C, the microstructure at a heating Bending area , 7 temperature of 880 C was similar to the as-received sheet. When the heating temperature increased to 880 C, the hardness increased to 370 HV0. It was found that the hot hat-shaped bending of the titanium alloy sheet using the resistance heating was effective in improving the productivity. Keywords: titanium alloy sheet, Ti-Al-V, hot stamping, resistance heating, springback