Seamless elbow forming method is introduced in the first place

1. Forging method: let the swaging machine will be washed out the pipe end and less quantity, reduce diameter, commonly used seamless elbow type forging machine with rotary, connecting rod type, roller type.
2. Rolling method: mostly without core shaft, suitable for thick wall pipe inside circular edge. Placed in the tube core, peripheral with wheeled push, used for circular edge skills.
3. Stamping method: on the punch with a tapered core of tube end expanding to the required standard and shape.
4. Forming method: there are three kinds of methods are commonly used, a method called expansion method, and a method named stamping method, is ultimately roller method, there are three or four roller, two fixed roller, an adjusting roller, adjust the fixed roller spacing, finished pipe is bent.
5. Ballooning method: one is placed in the tube rubber, with above, punch squeeze tube bulge forming; Another method is the hydraulic bulge forming, in the central tube filled with liquid, the liquid pressure the pipe drum into the required shape, the fruit of the corrugated pipe most with this method.