The cylinder barrel is a key component used in hydraulic cylinders to carry hydraulic oil, pistons, and other components. It forms a closed chamber together with the cylinder head, pistons, and other parts to drive the piston movement. It is an important carrier for converting hydraulic energy into mechanical energy and is applied in various hydraulic systems, such as engineering machinery, metallurgical equipment, aerospace and other fields.

Cylindrical shape: The cylinder barrel is usually cylindrical, and its inner diameter is calculated and determined according to the load requirements, and a value close to the standard size is selected.
High strength and stiffness: Due to the high hydraulic pressure that the cylinder needs to withstand, it must have sufficient strength and stiffness to resist the effects of hydraulic pressure and other external forces.
Precision machining: The inner hole of the cylinder is usually manufactured using precision machining processes such as boring, reaming, rolling, or honing to ensure that the surface roughness, roundness, cylindricity, and straightness parameters meet the requirements, thereby ensuring that the piston and its sealing and supporting components can slide smoothly, and ensuring the sealing effect and reducing wear.

There are various materials for cylinder barrels, and when selecting, multiple factors such as working pressure, working environment, and cost need to be considered. Common materials include:
Carbon steel: such as 20 #, 35 #, 45 #, etc., has good strength and toughness, and is suitable for general hydraulic cylinders.
Alloy steel: such as 27SiMn, 25Mn, etc., improve the thermal hardening and wear resistance of steel by adding alloy elements, suitable for harsh environments such as high pressure and high temperature.
Stainless steel, such as SUS304, 316L, etc., has good corrosion resistance and is suitable for corrosive media environments.
Cast iron: such as gray cast iron, ductile iron, etc., suitable for cylinders with complex shapes and low pressure.

The manufacturing process of cylinder usually includes:
Cutting: Select suitable steel pipes or steel billets for cutting according to design requirements.
Quenching and tempering treatment: For materials that require improvement in strength and toughness, quenching and tempering treatment is carried out.
Precision machining: Using processes such as boring, reaming, rolling, or honing to perform precision machining on the inner hole of the cylinder.
Surface treatment: Chrome plating, painting and other treatments are applied to the surface of the cylinder barrel as needed to improve corrosion resistance and aesthetics.
Assembly and testing: Assemble the processed cylinder with other parts, and conduct pressure and functional tests to ensure that the performance of the cylinder meets the requirements.

Sealing performance: The sealing performance between the cylinder barrel, piston, seals and other components must be good to prevent oil leakage.
Wear resistance: The surface of the cylinder bore should have high hardness and wear resistance to reduce friction and wear during piston sliding.
Stability: The cylinder barrel should maintain a stable shape and size when subjected to hydraulic pressure, without deformation or rupture.

In order to extend the service life of the cylinder and ensure the normal operation of the hydraulic system, regular maintenance and upkeep of the cylinder are necessary. Specific measures include:
Regular inspection: Check the surface of the cylinder for damage, cracks, and other defects, as well as whether the seals are aging or worn.
Cleaning and maintenance: Regularly clean the outer surface of the cylinder and the piston rod to prevent dust and debris from entering the interior of the cylinder.
Replace the seal: If the seal is found to be aging or worn, it should be replaced in a timely manner.
Reasonable lubrication: lubricate moving parts such as piston rods to reduce friction and wear.