Skiving and Burnishing for Cylinder Barrel Bore
Honed or Skiving and burnishing are the two common for cylinder barrel production. Datong Hydraulic as a professional manufacturer, we only use cold drawn seamless tube to manufacture cylinder tubes
For a hydraulic cylinder to operate effectively, the cylinder’s ID must be precisely round and have a mirror-like surface finish to ensure a tight seal between it and the mating internal piston. This is commonly achieved through skiving and subsequent roller burnishing inside a tubular workpiece. Skiving uses a set of carbide blades positioned around the diameter of a tool to slice away chips and create a geometrically round bore. Roller burnishing, a cold-working process, uses multiple rollers to compress the peaks of material left behind after skiving to generate an extremely smooth surface finish. Burnishing also introduces a residual stress layer into the cylinder wall, which improves cylinder fatigue life.
The tubes used for hydraulic cylinders are relatively thin. Care must be taken to secure the tube rigidly enough for the skiving and roller burnishing processes, but not so tightly as to deform it. Therefore, clamping cones are typically used to hold the tubes on both ends instead of three-jaw chucks. This clamping method also facilitates quick workpiece changeovers in automated environments. In addition, extra support must be provided along the length of the tube due to the inherently high length-to-diameter ratio of these workpieces.
According to the cylinder pressure and inside diameter size, different steel tube would be selected.
ID ≤300mm, choose cold drawn precision seamless tube
300mm≤ID ≤500mm, choose hot rolled seamless tube
500mm≤ID ≤1000mm, choose forged tube
Steel grade : ST52 ,SAE1020, SAE1045, 27SiMn , CK45,SAE4140,SAE1518, SAE4145 ,St52-3, SUS304, SUS316L etc.
Inside boring and honing , roughness R0.2-R0.4
Inside chromed : if necessary ,tube inside chrome plating could be applied