Liu Hua1£¬Xi Qingpo2£¬Huo Yanjun2£¬Sun Hongxing2£¬ Zhang Xiechang2£¬Li Yuanhong2£¬Liu Baixuan2£¬Chen Jinde1
(1.School of Mechanical Engineering,Xi'an Jiaotong University,Xi'an 710049,China;2.Zhengzhou Research Institute of Mechanical Engineering,Zhengzhou 450052,China)
Abstract:Finite element model of cold-forging precision process for cylindrical spur gear with ferrous metal was established.A numerical simulation associated with the experiments was adopted to investigate gear tooth surface dimension for cold-forging precision process of the cylindrical spur gear with ferrous metal.The results show that the elastic expansion of the mould and the elastic recovery of gear after mould unloading have a remarkable influence on the dimension of the gear tooth surface,and the former is dominant during the procedure.The variation of the gear tooth dimension in the gear coldª²forging process is mainly considered as the radial expansion,and the variation appears slightly at the of top gear tooth.The gear tooth shape curves during the mould expansion and the gear elastic recovery were plotted respectively. According to the modified value,the cold forging precision mould for the cylindrical spur gear with 45££ mild steel was manufactured practically, and the gears were forged in batches,whose accuracy can meet the requirements of GB£¯T10095.1-2001/7 precision class£®
Keywords:cylindrical spur gears;cold precision forging;elastic forming;gear tooth modifying;numerical simulation