Due to the characteristics of the rotary forging process of bevel gear, it has the following main advantages:
(1) Save effort. Firstly, because the deformation resistance of plastic processing is the product of the average pressure per unit area and the contact area, while the rotary forging of bevel gear is a continuous local deformation process, and the contact area is much smaller than that of conventional forging; At the same time, the relative motion between the die and the workpiece has rolling, the friction coefficient is small, and the plastic flow resistance is reduced; Moreover, if the contact area is small, the relative thickness of the plastic zone is large, the stress state coefficient is small, and the deformation resistance is small. To sum up, the deformation resistance of bevel gear rotary forging is only 1 / 5-1 / 20 of that of conventional forging.
(2) The formed size and shape have high accuracy and can realize less and no cutting. As the bevel gear rotary forging is an incremental forging process, it can force the metal to fill all corners, with high dimensional and shape accuracy and low surface roughness.
(3) Because the rolling pressure is small and the average unit pressure is small, it can be used for cold forging and can form parts that are difficult to be formed by other cold plastic processing. It is a very effective less and no cutting processing method. This is also the main reason why the cold rotary forging process of bevel gear is used to accurately process bevel gear.
(4) The service life of bevel gear rotary rolling die is high. Compared with traditional forging, the rolling unit pressure of swing rolling is much smaller, the swing head is in local contact with the workpiece, the die load is low, and the load is intermittent, so the bevel gear swing rolling die is more wear-resistant, slow failure and long service life.
(5) Good working environment, easy to mechanized and automatic production.
Due to the above advantages of bevel gear rotary rolling process, it has unique advantages in the field of precision machining. China started early in the theoretical research and production practice of bevel gear rotary forging process, and has made many achievements. In the aspect of rotary forging of bevel gear, Wuhan Institute of technology has studied the warm rotary forging process of planetary bevel gear of automobile rear axle differential, and the sintered forging has met the design requirements; Chongqing Wujiu Institute and Xi’an Jiaotong University forging research group studied the effects of process parameters such as swing head trajectory and bevel gear swing rolling time on the filling degree of tooth profile in the cold swing rolling forming process of planetary bevel gear, and calculated the swing rolling force of bevel gear.