As one of the main transmission parts of automobile, the driven spiral bevel gear of automobile rear axle has great development space and prospect. The main research content is the precision forging process of automobile rear axle driven spiral bevel gear. Through CATIA v5r21 three-dimensional mathematical modeling software and DEFORM-3D finite element numerical simulation software, various parameters of precision forging process of automobile rear axle driven spiral bevel gear are optimized, and the optimal forming scheme is obtained. The conclusions are as follows:
(1) The process of precision forging automobile rear axle driven spiral bevel gear with blanks of different sizes is analyzed. It is obtained that the optimal scheme of blank size is inner diameter 125 mm, outer diameter 175 mm, height 33.5 mm and upper surface cone angle 18 °.
(2) The precision forging process of driven spiral bevel gear of automobile rear axle at different temperatures is analyzed. It is obtained that the optimal scheme of machining temperature is warm machining at 800 ℃.
(3) The precision forging process of automobile rear axle driven spiral bevel gear with different forming speed is analyzed, and the optimal scheme of forming speed is 12.5 mm / s.
(4) The precision forging process of driven spiral bevel gear of automobile rear axle with different friction factors is analyzed. It is obtained that the greater the friction factor is, the greater the forming load is, the greater the forming deformation resistance is, and the forming is more difficult. Therefore, using water agent graphite to lubricate the die and blank can improve the forging quality and die service life.
(5) The technological process of precision forging automobile rear axle driven spiral bevel gear with two different die structures of scheme a and scheme B is analyzed, and it is concluded that scheme a is more conducive to forming.