The blank size, forming temperature, forming speed, friction factor and die structure of the precision forging process of the driven spiral bevel gear of the automobile rear axle are optimized from the aspects of stroke load curve, equivalent stress distribution and equal effect variation distribution. 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. The maximum load and the maximum equivalent stress value of each group of simulation experiments are basically the same, and the scheme of outer diameter 175 mm is the smallest. Therefore, the optimization result is that the blank with inner diameter 125 mm, outer diameter 175 mm, height 33.5 mm and upper surface cone angle 18 ° is the best.
(2) Through the analysis of the precision forging process of the driven spiral bevel gear of the automobile rear axle at different temperatures, it can be seen that the metal plasticity increases with the increase of temperature. The higher the temperature, the easier it is to form. However, if the temperature is too high, it is easy to form oxide film on the surface of the forging and affect the quality of the forging. Therefore, the best processing scheme should be warm processing, with the processing temperature of 800 ℃.
(3) The precision forging process of automobile rear axle driven spiral bevel gear with different forming speeds is analyzed. When the forming speed is 12.5 mm / s, the forming efficiency is high and the equal effect becomes the smallest. At this time, the forming effect is the best.
(4) By analyzing the precision forging process of driven spiral bevel gear of automobile rear axle with different friction factors, it can be concluded 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) By analyzing the technological process of precision forging the driven helical gear of automobile rear axle with two different die structures of scheme a and scheme B, it can be seen that the maximum load and maximum equivalent effect of scheme a become smaller and more conducive to forming.