Processing Technology of Bent Pipes and the Importance of Insulation for Bent Pipes
The innovative technology of free bending is predominantly utilized in the bending process within the automotive industry. The bending is primarily achieved through Z-directional feeding of the guiding and bending dies, connected via ball bearings. During the bending process, the AC servo motor only modifies the X-axis and Y-axis direction of the ball bearings.
The free bending technology boasts rapid bending speed, minimal spiral bending transition, and eliminates the need for reinstallation or clamping of customized bending geometries. This method is particularly suitable for bending profiles and pipes, making free bending ideal for fabricating automotive pipe bends.
For the manufacture of heat exchangers, such as those in air conditioning and hot water systems, a zero-radius bending technology has been successfully developed, facilitated by bending processes and hydraulic methods. The mold comprises upper and lower sections, into which the steel pipe is inserted and subjected to internal pressure (P). With the influence of thrust (W), the upper and lower molds move relative to each other, bending the steel pipe to a zero-radius. To prevent local fracture during the bending deformation, pressure (F) is applied at both ends of the steel pipe. By choosing suitable internal pressure (P), pressure (F), and mold movement force (W), the likelihood of defects during the bending process is minimized, ensuring high-quality bent pipes.
The medium-frequency induction localized heating technology is among the most advanced techniques for processing large-diameter, thick-walled pipes. It primarily involves electromagnetic induction heating of the steel pipe, controlled by directing rollers, guiding, and clamping the front end of the pipe with a rotating bending arm. This method ensures high quality, aesthetically pleasing results, precise bending radii, wide applicability, simple process equipment, high production efficiency, and significant economic benefits.
To a significant extent, bent pipes have been widely employed in the processing of large pipelines in power plants and chemical equipment.
Bent pipes are used in various environments with differing temperature conditions, demanding pipes adaptable to various surroundings, especially in certain low-temperature environments. To safeguard the pipes, the following insulation measures should be taken:
1. When insulation layers are required, the interfaces and welded joints of the pipes should be reserved, and the joints insulated upon successful hydrostatic testing.
2. Anti-freezing measures should be taken during winter construction.
3. Debris at the bend should be cleaned before insulation.
4. Insulated pipes must meet the requirements for anti-corrosion and pressure tests, and only civil engineering should be closed after insulation is completed.
The insulation of bent pipes includes safeguarding against freezing, maintaining good pipe performance, and extending the pipeline's lifespan.
The detailed insights provided above address the processing technology, advantages of bent pipes, and the importance of insulation for bent pipes. It's hoped that this information will better guide understanding and utilization of bent pipes.
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