Seamless Elbow Supplier in China
1. Forging method: Use a swage forging machine to stretch the end or part of the pipe to reduce the outer diameter. Commonly used swage forging machines include rotary type, connecting rod type, and roller type.
2. Rolling method: Generally, no mandrel is used, and it is suitable for the inner round edge of thick-walled tubes. The core is placed inside the tube, and the outer circumference is pushed by rollers for round edge processing.
3. Stamping method: Use a tapered core on the punching machine to expand the pipe end to the required size and shape.
4. Bending forming method: There are three commonly used methods, one method is called stretching method, the other method is called stamping method, and the third method is roller method. There are 3-4 rollers, two fixed rollers, and one adjustment roller. With a fixed roll gap, the finished pipe is bent.
5. 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 use this method.
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