Abstract
In the present study, the hot forging design of a typical landing gear barrel was evolved using finite element simulations and validated with experiments. A DEFORM3D software was used to evolve the forging steps to obtain the sound quality part free of defects with minimum press force requirements. The hot forging trial of a barrel structure was carried out in a 30 MN hydraulic press based on the simulation outputs. The tensile properties of the part were evaluated by taking samples from all three orientations (longitudinal, long transverse, short transverse). The hardness and microstructure of the part were also investigated. To study the soundness of the product, fluorescent penetrant inspection and ultrasonic testing were performed in order to identify any potential surface or internal defects in the part. From experiments, it was found that the part was formed successfully without any forging defects such as under filling, laps, or folds that validated the effectiveness of the process simulation. The tensile properties of the part were well above the specification limit (>10%) and the properties variation with respect to the orientation was less than 2.5%. The part has qualified the surface defects level of Mil Std 1907 Grade C and the internal defects level of AMS 2630 Class A (2 mm FBh). The microstructure shows mean grain length and width of 167 and 66 µm in the longitudinal direction. However, microstructure results revealed that the coarse grain structure was observed on the flat surface near the lug region due to the dead zone formation. An innovative and simple method of milling the surface layer after each pressing operation was applied to solve the problem of the surface coarse grain structure.
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D.B. Shan, W.C. Xu, and Y. Lu, Study on Precision Forging Technology for a Complex-Shaped Light Alloy Forging, J. Mater. Process. Technol., 2004, 151, p 289–293
A.N. Bramley and D.J. Mynors, The Use of Forging Simulation Tools, Mater. Des., 2000, 21, p 279–286
T. Chanda, J. Zhou, and J. Duszczyk, FEM Analysis of Aluminium Extrusion Through Square and Round Dies, Mater. Des., 2000, 21-4, p 323–335
Anon, DEFORM Manual, Scientific Forming Technologies Corporation Press, Columbus, OH, 1994
Z.J. Zhang, G.Z. Dai, S.N. Wu, L.X. Dong, and L.L. Liu, Simulation of 42CrMo Steel Billet Upsetting and Its Defects Analyses During Forming Process Based on the Software DEFORM3D, Mater. Sci. Eng. A, 2003, 499, p 49–52
Y.S. Kim, Y.S. Son, and C.I. Kim, Rigid-Plastic Finite Element Simulation for Process Design of Impeller Hub Forming, J. Mater. Process. Technol., 2003, 143-144, p 729–734
Q. Ma, Z. Lin, and Z. Yu, Prediction of Deformation Behavior and Microstructure Evolution in Heavy Forging by FEM, Int. J. Adv. Manuf. Technol., 2009, 40, p 253–260
J. Hu, Y. Yi, and S. Huang, Experimental Study and Microstructure Analysis of Aviation Component by Isothermal Forging Process, Mater. Manuf. Processes, 2015, 30, p 79–84
G.D. Satish, N.K. Singh, and R.K. Ohdar, Preform Optimization of Pad Section of Front Axle Beam Using DEFORM, J. Mater. Process. Technol., 2008, 203, p 102–106
N.K. Park, I.S. Kim, Y.S. Na, and J.T. Yeom, Hot Forging of a Nickel-Base Superalloy, J. Mater. Process. Technol., 2001, 11, p 98–102
B. Lu, H. Ou, C.G. Armstrong, and A. Rennie, 3D Die Shape Optimisation for Net-Shape Forging of Aerofoil Blades, Mater. Des., 2009, 30, p 2490–2500
J.J. Park and H.S. Hwang, Preform Design for Precision Forging of an Asymmetric Rib-Web Type Component, J. Mater. Process. Technol., 2007, 187-188, p 595–599
Y. Choi and J.C. Choi, Forging of Helical Gears: Upper Bound Analyses and Experiments, Met. Mater., 1998, 4, p 747–754
B.A. Behrens and D. Odening, Process and Tool Design for Precision Forging of Geared Components, Int. J. Mater. Form., 2009, 2, p 125–128
C. Xuewen and J.D. Won, Gear Hot Forging Process Robust Design Based on Finite Element Method, J. Mater. Sci. Technol., 2008, 22, p 1772–1778
C. Chen, Grain-Size Effect on the Forging Formability of Mini Gears, Int. J. Adv. Manuf. Technol., 2015, 79(5), p 863–871
R. Lee and H.C. Lin, Process Design Based on the Deformation Mechanism for the Non-isothermal Forging of Ti-6Al-4V Alloy, J. Mater. Process. Technol., 1998, 79, p 224–235
J. Chen, K. Chandrashekhara, V.L. Richards, and S.N. Lekakh, Three-Dimensional Nonlinear Finite Element Analysis of Hot Radial Forging Process for Large Diameter Tubes, Mater. Manuf. Process., 2010, 25, p 669–678
S.I. Oh, W.T. Wu, and J.P. Tang, Simulations of Cold Forging Processes by the DEFORM System, J. Mater. Process. Technol., 1992, 35, p 357–370
K.Vollrath, Aarwangen, and Schweiz, Simulation of Forging Processes, Hagen, Publication No. EI-Sim-e-0413-10sim, 2013. (ISBN: 978-3-928726-31-3)
M. Sraml, J. Stupan, I. Potrc, and J. Kramberger, Computer-Aided Analysis of the Forging Process, Int. J. Adv. Manuf. Technol., 2004, 23, p 161–168
BS 2L 77, British Standard Aerospace Series Specification for Forging Stock and Forgings of Al-Cu-Mg-Si-Mn Alloy, August, 1971
M.G. Cockcroft and D.J. Latham, Ductility and the Workability of Metals, J. Inst. Met., 1968, 96, p 33–39
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Ram Prabhu, T. Simulations and Experiments of Hot Forging Design and Evaluation of the Aircraft Landing Gear Barrel Al Alloy Structure. J. of Materi Eng and Perform 25, 1257–1268 (2016). https://doi.org/10.1007/s11665-016-1960-4
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DOI: https://doi.org/10.1007/s11665-016-1960-4