Due to different manufacturing processes, stainless steel seamless elbows are available in two types: hot-rolled seamless elbows and cold-rolled seamless elbows.
For the forming process, there are 5 common methods:
1. Forging:
Forging is to use a forging machine to punch out the pipe end or part to reduce the outer diameter.
2. Rolling:
Rolling is to place a core in the pipe and push the outer periphery with a roller for round edge processing.
3. Stamping:
Use a tapered core on the punch press to expand the pipe end to the required size and shape.
4. Bending forming:
① Stretching method
② Stamping method
③ Roller method: There are two fixed rollers and one adjustment roller. Adjust the fixed roller spacing, and the finished pipe fittings are bent.
5. Bulging:
① Place rubber in the pipe and compress it with a punch on the top to make the pipe bulge out.
② Hydraulic bulging forming, fill the middle of the pipe with liquid, and use the liquid pressure to bulge the pipe into the required shape.