What are the production methods of steel bending pipe

What are the production methods of steel bending pipe? One is to place rubber in the pipe and compress it with a punch above to make the pipe protrude; the other method is hydraulic bulging, filling the middle of the pipe with liquid, and the pressure of the liquid will bulge the pipe Into the required shape, most of the production of bellows is using this method.

1. Bulging method: one is to place rubber in the tube, and compress it with a punch to make the tube protrude; the other method is hydraulic bulging, filling the middle of the tube with liquid, and the pressure of the liquid bulges the tube into the desired shape. Shape, most of the production of corrugated pipes uses this method

2. Stamping method: use a tapered core on the punching machine to expand the pipe end to the required size and shape.

3. Roller method: place a core in the tube, and push the outer circumference with a roller for round-edge processing.

4. Rolling method: Generally, no mandrel is used, and it is suitable for the inner round edge of thick-walled tubes.

5. Bending forming method: There are three commonly used methods, one method is called the stretching method, the other method is called the stamping method, and the third method is the roller method. There are 3-4 rollers, two fixed rollers, and one adjustment roller. With a fixed roll gap, the finished pipe is bent.

6. Forging method: Use a swage forging machine to stretch the end or part of the pipe to reduce the outer diameter of the pipe. Commonly used swage forging machines include rotary, connecting rod, and roller types.