First, the material is hot pushed. The pusher is a horn shaped core head or mandrel. The mandrel changes from thin to thick. The process of pushing the elbow is a process of bending the expanding belt. There is a support at the back. The blanking pipe section is threaded into the mandrel. At the back, there is a memorial archway frame to fix the mandrel. In the middle, there is a small car. Some of the cars are driven by hydraulic pressure, and some are driven by mechanical drive, that is, the lead screw. Then push the car forward. The car pushes the pipe along the mandrel. There is an induction ring outside the mandrel to heat the pipe, heat it well, and then the car pushes the pipe down to process a product.

Secondly, we will proceed with the finishing process, which involves shot peening to remove the oxide scale on the inner and outer surfaces of the elbow. The two ends will be beveled for welding purposes.

Thirdly, it is necessary to first select the specifications and propose the pipe materials, such as a 90 ° elbow. By calculating its curvature, the length of material that can be processed into a 90 ° elbow can be determined, and then cut according to that length.

Fourthly, after being pushed, the elbow should be shaped in this hot state, because some elbows may become twisted if not handled properly, which is not allowed. In addition, after pushing the head, the outer diameter of the front end is generally large and needs to be shaped through a shaping die. The shaping mold is actually a press machine, with a set of molds, two semi-circular arcs, one on top and one on bottom. The outer diameter after shaping reaches the size of the finished product.

Then, after inspection, steel lettering, painting, packaging and other processes, it can leave the factory.