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Forming Processes and Technical Considerations for Metal Bellows
2026-03-16
In industrial piping systems, metal bellows serve as flexible connecting elements, and their forming processes directly impact product performance and durability. Modern manufacturing companies have established a systematic process workflow centered on material properties and forming technologies during the production of bellows.
I. Material Selection: The Foundation of Performance
The quality of metal bellows depends primarily on the selection and processing of raw materials:
Material Selection: Different types of stainless steel or corrosion-resistant alloys are selected based on the corrosiveness of the working medium, temperature range, and pressure conditions. Each material has distinct characteristics in terms of ductility, temperature resistance, and corrosion resistance.
Strip Processing: Before forming, raw materials must undergo surface cleaning and precision slitting to ensure consistent strip width and smooth edges, laying the foundation for subsequent forming processes.
Performance Matching: The mechanical properties of the material must align with the design specifications of the final product; excessive or insufficient strength will affect the bellows’ performance under actual operating conditions.
II. Forming Process: Methods for Creating the Corrugated Structure
The elastic properties of corrugated tubes stem from their unique corrugated structure, and the forming stage is the core step that imparts functionality to the product:
Hydraulic Forming: By applying liquid pressure inside the tube and combining it with axial extrusion by the die, the tube blank gradually forms corrugations within the die cavity. This method produces corrugations with regular shapes and good dimensional consistency
Mechanical Rolling: This method uses rollers to apply radial pressure to the surface of the tube blank, mechanically forming the corrugations section by section. It is suitable for the continuous production of products with specific specifications.
Welded Assembly: For large-diameter or specially structured corrugated tubes, a method of first forming corrugated sections and then welding them together can be adopted to meet the design requirements of complex structures.
III. Inspection Process: Ensuring Product Reliability
After forming, corrugated pipes must undergo multiple inspections to assess whether they meet operational requirements:
Dimensional Measurement: Measure key dimensions such as inner and outer diameters, corrugation pitch, and wall thickness to verify compliance with design specifications.
Stiffness Testing: Measure the elastic response of the corrugated pipe under compression or tension by applying loads to evaluate its compensation capacity.
Pressure Resistance Testing: The product’s sealing performance and pressure-bearing capacity are tested at specified pressures to ensure there is no risk of leakage during use
Fatigue Evaluation: By simulating actual operating conditions through repeated loading, the performance trends of the bellows during long-term use are assessed
The forming process of metal bellows integrates materials science and precision machining technology; control over every step influences the product’s actual performance within piping systems.
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