Rohrzylinder

Rohrzylinder is a hollow cylindrical body with a uniform wall thickness, formed from metal, plastic or ceramic. It has an inside diameter (Di), an outside diameter (Do) and a length (L). In technical usage it is treated as a generic geometric form—a hollow cylinder or tube that can serve as a structural element, sleeve, liner or bearing surface.

Geometrically, the wall thickness is t = (Do − Di)/2, and the cross-sectional area is A = π/4 (Do^2 − Di^2). The geometry determines stiffness and strength in applications; the hollow shape reduces weight while preserving bending and torsional rigidity relative to a solid rod of the same outer diameter. Ends may be closed or open, and the inner bore can be machined to high precision or fitted with additional features such as flanges or end caps.

Manufacturing methods vary. Seamless Rohrzylinder are commonly produced by extrusion or cold/hot drawing of metal, or by extrusion of plastics. Welded tubes are made from rolled sheet with a longitudinal seam. After forming, the bore and outer surface are machined to required tolerances; finishing processes may include heat treatment, surface hardening, coating or corrosion protection.

Materials and finishes depend on the application. Typical materials include steel and stainless steel, aluminum, copper alloys and high-performance polymers or ceramics. Tolerances and surface quality are governed by engineering standards and specifications, ensuring concentricity and straightness suitable for their role as structural components, liners, sleeves or as elements in hydraulic or pneumatic systems.

In summary, the Rohrzylinder is a versatile hollow cylindrical form used across engineering disciplines for parts requiring a combination of hollow geometry, strength and precise bore characteristics.