Abstract
The warm deformation behavior of 20Cr2Ni4A steel and the relative constitutive equation are ascertained to support the technical study. Factors that influence the warm extrusion of spur gear are analyzed by using the numerical simulation method. Among the various influencing factors, the lubricating condition, entrance angle, and initial blank size are the crucial factors. Spur gears with a good quality can be one-step formed by warm extrusion under a good lubricating condition (friction factor less than 0.3). Nevertheless, this kind of lubricating condition is very hard to be achieved in a real production environment. “Variable contour two-step warm extrusion” is proposed, in order to obtain a good forming result in a poor lubricating condition. Pre-extrusion is firstly implemented by a die which contour is enlarged from the final-toothed contour for the tooth forming, and then the workpiece is turned around to implement the finish extrusion by a die with the final-toothed contour for insufficient section compensation and tooth sizing. Accuracy of the finished gear obtained through this process is tested; the maximum mean error of single tooth is 15.5 μm.
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References
Abdul NA, Dean TA (1986) An analysis of the forging of spur gear forms. Int J Mach Tool Des Res 26:113–123
Kondo K, Ohga K (1995) Precision cold die forging of a ring gear by divided flow method. Int J Mach Tools Manuf 35:1105–1113
Choi JC, Choi Y (1999) Precision forging of spur gears with inside relief. Int J Mach Tools Manuf 39:1575–1588
Cai J, Dean TA, Hu ZM (2004) Alternative die designs in net-shape forging of gears. J Mater Process Technol 150:48–55
Hu CL, Wang KS, Liu QK (2007) Study on a new technological scheme for cold forging of spur gears. J Mater Process Technol 187–188:600–603
Hu CL, Liu QK, Zhao Z, Chen J, Wu GM (2010) Two step forging process of spur gear based on rigid parallel motion. J Shanghai Jiaotong Univ (Sci) 15:241–244
Cheng FS, Hsu KK, Chen YS (2014) The study of hot forging process by using lower strength material as die. Mater Res Innov 18:22–25
Yang C, Zhao S, Zhang J (2014) Precision forging of spur gear by flow control forming method. Aust J Mech Eng 12:101–109
Dean TA (2000) The net-shape forming of gears. Mater Des 21:271–278
Kawasaki K, Shinma K (2008) Design and manufacture of straight bevel gear for precision forging die by direct milling. Mach Sci Technol 12:170–182
Berviller L, Bigot R, Martin P (2006) Technological information concerning the integrated design of “net-shape” forged parts. Int J Adv Manuf Technol 31:247–257
Neugebauer R, Putz M, Hellfritzsch U (2007) Improved process design and quality for gear manufacturing with flat and round rolling. CIRP Ann Manuf Technol 56:307–312
Neugebauer R, Hellfritzsch U, Lahl M (2008) Advanced process limits by rolling of helical gears. Int J Mater Form 1:1183–1186
Zhang DW, Zhao SD (2014) New method for forming shaft having thread and spline by rolling with round dies. Int J Adv Manuf Technol 70:1455–1462
Zhu CD, Jiang X, Dai TL (2015) Research on technology of twin rollers rotary forging of spiral bevel gears. Ironmak Steelmak 42:632–640
Han XH, Hua L, Zhuang WH, Zhang XC (2014) Process design and control in cold rotary forging of non-rotary gear parts. J Mater Process Technol 214:2402–2416
Li YY, Zhao SD, Fan SQ, Yan GH (2013) Study on the material characteristic and process parameters of the open-die warm extrusion process of spline shaft with 42CrMo steel. J Alloys Compd 571:12–20
Jeong MS, Lee SK, Yun JH, Sung JH, Kim DH, Lee S, Choi TH (2013) Green manufacturing process for helical pinion gear using cold extrusion process. Int J Precis Eng Manuf 14:1007–1011
Yuan AF (2009) Cold extrusion of a long trapezium spline and its forming analysis. Int J Adv Manuf Technol 41:461–467
Song JH, Im YT (2007) The applicability of process design system for forward extrusion of spur gears. J Mater Process Technol 184:411–419
Hu CL, Zhao Z, Gong AJ, Shi WB (2015) Study of an alternative novel cold forging process. Mater Manuf Process 30:1210–1217
Bingöl S, Ayer Ö, Altinbalik T (2015) Extrusion load prediction of gear-like profile for different die geometries using ANN and FEM with experimental verification. Int J Adv Manuf Technol 76:983–992
Jung SY, Kang MC, Kim C, Kim CH, Chang YJ, Han SM (2009) A study on the extrusion by a two-step process for manufacturing helical gear. Int J Adv Manuf Technol 41:684–693
Lin YC, Chen MS, Zhong J (2008) Effect of temperature and strain rate on the compressive deformation behavior of 42CrMo steel. J Mater Process Technol 205:308–315
Feng W, Fu YH (2014) High temperature deformation behavior and constitutive modeling for 20CrMnTiH steel. Mater Des 57:465–471
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Wang, W., Zhao, J., Zhai, R. et al. Variable contour two-step warm extrusion forming of spur gear and the deformation behavior of 20Cr2Ni4A steel. Int J Adv Manuf Technol 88, 3163–3173 (2017). https://doi.org/10.1007/s00170-016-9027-0
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DOI: https://doi.org/10.1007/s00170-016-9027-0