Roll spinning forming device and method for toothed part

A roll spinning forming device for a toothed part, the roll spinning forming device being mounted on a machine tool body, and the roll spinning forming device comprising a spindle, a mandrel, a driving gear, a driven gear, a driven gear support, a roller, a roller support, a telescopic constant speed universal joint assembly, a spring and a servo motor assembly,

• wherein the mandrel is mounted on an upper end surface of the spindle, and the driving gear is mounted on the spindle and is located below the mandrel;
• the driven gear support comprises a first vertical plate and a first bottom plate, the first vertical plate and the first bottom plate are integrally formed, the roller support comprises a second vertical plate and a second bottom plate, the second vertical plate and the second bottom plate are integrally formed, the first bottom plate and the second bottom late are arranged relatively in parallel, the first vertical plate and the second vertical plate are arranged in parallel, an inner side wall of the first vertical plate is contactable with an outer side wall of the second vertical plate, the driven gear is mounted on the first bottom plate through a bearing, the roller is mounted on the second bottom plate through a second bearing, and the driven gear and the roller are arranged in parallel;
• the telescopic constant speed universal joint assembly is mounted between the driven gear and the roller, such that the driven gear and the roller rotate at a same angular speed and are capable of moving relatively in a radial direction;
• one end of the spring is directly connected to an outer side wall of the first vertical plate and the other end of the spring is connected to the machine tool body, and the spring pushes the driven gear support to move towards the spindle;
• and one end of the servo motor assembly is connected to the outer side wall of the second vertical plate through a bearing assembly and the other end of the servo motor assembly is connected to the machine tool body, and the servo motor assembly drives the roller support to move back and forth in the radial direction and drives the driven gear support to move away from the spindle, and the driven gear is disengaged from the driving gear when the driven gear moves away from the spindle.