Spiral pipe processing means on the basis of the original spiral pipe manufactured in accordance with the requirements of the requirements of the desired product.
There are two common spiral pipe processing methods.
First, the thermal expansion method
1. bulging law
One is placed in a rubber tube, with the upper punch compression, the tube shaped projection; Another method is forming a hydraulic bulging in the middle of the tube filled with liquid, the liquid pressure of the tube to the desired shape of the drum, bellows Most of the production is used in this method.
2. forging method
By swaging machine will be part of the red end of the tube or extension, reducing the outer diameter, commonly swaging machine has a rotary, link type, roller.
3. The bending method
There are three methods more commonly, a process called stretching method, another method called stamping method, a third roller method, a roller 3-4, two fixing rollers, a steering roller, fixing roller pitch adjustment, the finished tube It is curved.
4. stamping
In the punch with a core tapered end of the tube to expand to the required size and shape.
5. rolling method
Generally do mandrel, suitable for thick-walled tubes inside of the circle edge.
6. The roller method
The core is placed in the tube, with the outer periphery of the roller pushing for round edge processing.
Second, anti-corrosion method
Such steel is that people often say that the corrosion spiral steel pipe, this processing method is defined as the surface layer and the inner spiral pipe coated with a chemical coating, a common form of corrosion 3pe corrosion, anti-corrosion epoxy resin, cement mortar corrosion, such processing method biggest goal is to extend the life of the pipeline.
