Machines engineered specifically to perform skiving and roller burnishing operations deliver precise roundness tolerances and quality surface finishes. (Article From: Modern Machine Shop, Derek Korn, Senior Editor)
The machines are designed to use combination skiving/roller burnishing tools to produce geometrically round holes with quality surface finishes for hydraulic cylinders.
Roller burnishing creates a mirror-like surface finish as smooth as Ra 0.05 micron.
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 three 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.
These operations are sometimes performed in one pass using a combination skiving/roller burnishing tool on a BTA-style deep-hole drilling machine. However we can supply a machines, tools and automation for deep hole-making applications, has recently designed machines engineered specifically to perform skiving and roller burnishing operations, noting increasing demand in the hydraulics market for such equipment. We’re using a single tool for both operations, achieving roundness tolerances of IT-8 and bore surface finishes as smooth as Ra 0.05 to 0.15 micron in one setup and one tool pass.