伞齿轮在汽车、拖拉机、坦克等各种车辆的驱动机构中大量使用,因此产量很大,但目前都是用模锻制造毛坯。由于锻件径向尺寸较大,锻件变形力大,需要大型的模锻设备。锻出的工伴还有较大的飞边,如第二汽车制造厂生产EQ140汽车后桥从动伞齿轮锻坯,使用了12000吨热模锻压力机,锻件飞边有5kg重,相当于锻件重量的20％,增加了原材料的消耗,仅这一项每年就要多消耗600～700吨20MnVB钢材。为了克服普通模锻生产伞齿轮毛坯的缺点,可以使用辗扩新工艺,该工艺能制造出没有飞边的伞齿轮坯,而且精度较高,所以这项新工艺对于伞齿制造具有非常可观的经济效益。伞齿轮坯辗扩成形工艺的工步:镦粗→预锻制坯→冲连皮→辗扩。辗扩成形如图1所示。将预制好的坯料放在驱动辊和芯辊之间,驱动辊连续转动和下压 Bevel gears are widely used in drive mechanisms for a variety of vehicles such as automobiles, tractors, tanks and so on, so the output is large, but now the rough is made by swaging. Due to the large forging radial size, deformation of forgings, need large forging equipment. Forging workers also have a larger flash, such as the second car factory production EQ140 rear axle driven bevel gear forging, the use of 12,000 tons of hot forging presses, forging flash 5kg weight, the equivalent of Forging the weight of 20%, an increase of raw material consumption, only this one will have to consume more 600 to 700 tons of 20MnVB steel. In order to overcome the shortcomings of bevel gear blanks produced by conventional die forging, it is possible to use a new rolling process which produces a bevel gear blank without flash and a high degree of precision, so that this new process has a very impressive Economic benefits. Bevel gear blank rolling forming process steps: Upsetting → pre-billet → Rushed leather → Rolling expansion. Rolling shape shown in Figure 1. The pre-prepared blank is placed between the driving roller and the core roller, and the driving roller is continuously rotated and pressed down