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What is the blank of a metal bellows?

2019-12-06

The value of the load required to produce a unit displacement of a metal bellows or other elastic element is called the stiffness of the element, and it is generally represented by "K". If the elastic properties of the component are non-linear, the stiffness is no longer constant, but changes as the load increases. The elastic tolerance of bellows for general engineering can be limited within +/- 50%.

A bellows is a thin shell component with a chaotic shape and extremely high functional requirements. It has many manufacturing procedures and messy processes. Therefore, in the production of bellows, the correct process design and implementation is critical. Today Dabeni talked with us about "tube blanks for metal bellows":

Metal corrugated pipe blanks are divided into two types: seamless pipe blanks and seam pipe blanks.

The production of seamless pipe blanks should be made according to different raw materials and different processes. Material processing plants can provide stainless steel thin-walled seamless pipes with a wall thickness of 0.1 ~ 0.3mm and an outer diameter of φ10 ~ 60mm. This kind of seamless pipe has a high surface finish, but a large wall thickness (+/- 0.03mm). It is generally used to make spiral bellows and ring bellows with low functional requirements. Metal bellows production plants can use 0.8 ~ 1mm thick metal sheet (strip) or 0.5 ~ 1mm thick thin-walled pipes to produce various specifications of corrugated pipe blanks through repeated deep drawing or spinning drawing processes. This process can produce tube blanks with high surface smoothness, small wall thickness and small official service (& lt; = + /-0.005mm), and shorter length, which is used to make corrugated pipes with higher requirements.

The production of seam tube blanks is generally made of plates or strips of the required thickness and then welded after being rolled. The quality of seam tube blanks depends directly on the quality of the plate (strip) material and welding quality. Generally speaking, its wall thickness public service is simpler to control.

The stiffness of the bellows is divided into axial stiffness, zigzag stiffness, torsional stiffness, etc. according to different load and displacement properties. In the application of bellows, most of the stress conditions are axial loads, and the displacement mode is linear displacement. The production of metal bellows begins with the selection of raw materials and passes through the main process links such as tube blank production, bellows forming, shaping, heat treatment, surface treatment, quality inspection, etc. to produce a bellows that meets the design requirements.


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