Expression of large diameter steel pipe diameter:
1. For water and gas transmission steel pipes (galvanized or non-galvanized), cast iron pipes, and other pipes, the pipe diameter should be expressed in nominal diameter DN;
2. For seamless steel pipe, welded steel pipe (straight seam or spiral seam), copper pipe, stainless steel pipe, and other pipe materials, the pipe diameter should be expressed by outer diameter × wall thickness;
3. For pipes such as reinforced concrete (or concrete) pipes, clay pipes, acid-resistant ceramic pipes, and cylinder tile pipes, the pipe diameter should be expressed by the inner diameter d;
4. When the design uses the nominal diameter DN to indicate the pipe diameter, there should be a comparison table between the nominal diameter DN and the corresponding product specifications.
The processing method of large-diameter steel pipe fittings:
The price of large-diameter steel pipe fittings is divided into methods such as forging, stamping, rolling, rolling, bending, and expansion. Several processing methods are introduced as follows:
1. Bending method of large-diameter steel pipe parts: 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 Adjust the roll, adjust the fixed roll distance, and the finished pipe is bent.
2. Stamping method for large-diameter steel pipe fittings: Use a tapered core on the punching machine to expand the pipe end to the required size and shape.
3. Roller method for large-diameter steel pipe parts: place a core in the tube, and push the outer periphery with a roller for round-edge processing.
4. Large-diameter steel pipe fittings forging method: use a swage forging machine to stretch the end or part of the pipe to reduce the outer diameter. Common swage forging machines include rotary type, connecting rod type, and roller type.
5. Rolling method of large-diameter steel pipe parts: Generally, no mandrel is used, and it is suitable for the inner round edge of thick-walled pipes.
6. Bulging method of large-diameter steel pipe fittings: one is to place rubber in the pipe, and compress it with a punch above to make the pipe protrude; Into the required shape, most of the production of bellows is using this method.
Post time: Dec-08-2022