RESEARCH ON MATERIAL FLOW-STRESS BEHAVIOR AND THE DIE-FORGING PROCESS FOR FORGED-STEEL BRAKE DISCS FOR HIGH-SPEED TRAINS
Abstract
Due to the large size and complicated features, the brake discs of high-speed trains are difficult to forge, so a reasonable design of the process and the die parameter are prerequisites for successful forming. The flow stress of 23CrNiMoV, a forged-steel brake disc material for high-speed trains, was investigated by a uniaxial compression experiment on a Gleeble 1500 test machine. Based on the obtained flow-stress data, a series of numerical simulation analyses of the die forging of high-speed-train brake discs were carried out by using finite-element software. The effects of forging temperature, flash groove parameters and forming speed on the flow filling, forming load and temperature change of metal during die forging were studied. The simulation results were optimized and better process parameters were obtained. Based on the obtained process parameters, the simulation of the forming process was completed and a better forming quality was obtained.
References
1 H. Heerok, K. Minsoo, L. Hoyong, J. Naktak, M. Hyunguk, L. Eunseong, K. Hyungmin, S. Myungwon, C. Jongduk, L. Junghwan., The thermo-mechanical behavior of brake discs for high-speed railway vehicles, J Mech Sci Technol., 33 (2019), 1711–1721, doi:10.1007/s12206-019-0323-0
2 C. Lu, J. Mo, R. Sun, Y, Wu, Z. Fan, Investigation into multiaxial character of thermomechanical fatigue damage on high-speed railway brake disc, Vehicles, 3 (2021), 287–299, doi:10.3390/vehicles3020018
3 Y. Liu, Y. Wu, Y. Ma, W. Gao, G. Yang, H. Fu, N. Xi, H Chen, High temperature wear performance of laser cladding Co06 coating on high-speed train brake discŠJÆ. Applied Surface Science, 481 (2019), 761–766, doi: 10.1016/j.apsusc.2019.02.235
4 A. Mohammad, K. Chandra, P. S. Misra, Wear Characteristic of Al-based metal matrix composites used for heavy duty brake pad applications, Materials Science Forum, 710 (2012), 407–411, doi:10.4028/www.scientific.net/msf.710.407
5 M..Djafri, M, Bouchetara, C. Busch, Effects of humidity and corrosion on the tribological behaviour of the brake disc materials, Wear, 321 (2014), 8–15, doi:10.1016/j.wear.2014.09.006
6 P. Grzes, W. Oliferuk, A. Adamowicz, K. Kochanowski, P. Wasilewski, A. A. Yevtushenko, The numerical-experimental scheme for the analysis of temperature field in a pad-disc braking system of a railway vehicle at single braking, International Communications in Heat and Mass Transfer, 75 (2016) 1–6, doi:10.1016%2Fj. icheatmasstransfer.2016.03.017
7 A. S. Jose, A. Athijayamani, K. Ramanathan, S. Sidhardhan, Micro¬structure and fatigue-crack growth of quenched and tempered 23CrNiMoV steel, Materiali in Tehnologije, 54 (2020), 385–391, doi:10.17222/mit.2019.210
8 L. Zhang, M. Y. Sun, D. Z. Li, Numerical simulation for die forging of high-speed railway brake disc hub, Journal of Plasticity Engineering, 19 (2012) 4, 56–61, doi:10.1063/1.4806876
9 L. Poloczek, L. Rauch, M. Wilkus, D. Bachniak, W. Zalecki, V. Pidvysotsk’yy, R. Kuziak, M. Pietrzyk, Physical and Numerical Simulations of Closed Die Hot Forging and Heat Treatment of Forged Parts, J. Materials, 14 (2020), doi: 10.3390/ma14010015
10 K. H. Raj, L. Fourment, T. Coupez, J. L. Chenot, . Simulation of Industrial Forging of Axisymmetrical Parts, J. Engineering Computations, 9 (2017), 575–586, doi:10.1108/eb023885
11 C. C. Hsu, H-Y. Chiu, C-C. Liao, Y-K. Fuh, An investigation on deformation mechanism of non-standard gear teeth forming in the hot impression forging of multicore cable cutter, J. Journal of Manufacturing Processes, 54 (2020), 158–168, doi:10.1016/j.jmapro. 2019.11.019
12 M. Wang, G. Wang, G R. Wang, Flow stress behavior and constitutive modeling of 20MnNiMo low carbon alloy, J. Cent. South Univ., 23 (2016), 1863–1872, doi:10.1007/s11771-016-3241-7
