What are the common specifications of hydraulic cylinder barrels?
1 Answers
Common specifications for hydraulic cylinder barrels include a 32mm bore with an 18mm rod diameter. Other specifications are: 40mm bore with 20/22/25mm rod diameter, and 50mm bore with 25/28/32mm rod diameter. Below is more relevant information: 1. Cylinder barrel material: Commonly used materials are 20, 35, and 45-grade seamless steel pipes, which are honed or rolled to achieve a roughness requirement within 0.4μm. Low-pressure hydraulic cylinders can use 20-grade steel pipes, while high-pressure hydraulic cylinders use 45-grade steel pipes. 2. Piston rod material: Piston rods come in solid and hollow types. The hollow piston rod requires a vent hole at one end for welding and heat treatment. Solid piston rods are made of 35 or 45 steel, while hollow piston rods are made of 35 or 45 seamless steel pipes. After rough machining, the piston rod is tempered to a hardness of 229~285HB. If necessary, high-frequency quenching is applied to achieve a hardness of 45~55HRC.