Available from Absolute Machine Tools, the Precihole SBN300/1-600 skiving and roller burnishing machine is well-suited for ID finishing operations for hydraulic tubes ranging from 1.37" to 16" ID and as long as 40 ft. The skiving process rapidly removes a layer of material from the internal surface of a tube, preparing it for the burnishing process. The machine is equipped with a modified floating reamer with carbide inserts for cutting. The roller burnishing-finishing process cold works the surface by pressing multiple rollers against the surface to flatten the peaks and valleys creating by skiving, resulting in a mirror-like surface finish such as that required by off-road equipment, mining equipment, and material handling machine manufacturers, among others.
The company says that by combining skiving and roller burnishing into a single operation using a combination tool, the manufacturing process for plain carbon steel, ST-52, ST-55 or aluminum tubes is typically 40 to 50 times faster than honing. It also results in a tube ID that is not only more work-hardened than the parent material, but also features a higher-quality surface finish. Feed rates as fast as 100 ipm are possible as are bore tolerances of IT7-IT8 and a surface finish as of 4 to 6 Ra micro-inches, the company says.
The skiving and roller burnishing system uses a tool that is rotated and fed with a high-capacity AC spindle motor mounted on a rack and pinion arrangement for tubes longer than 6 ft., while a ballscrew and nut mechanism is used for shorter tubes. Self-centering vices feature programmable dual-pressure hydraulic clamping settings, helping to deliver uninterrupted smooth finish and uniform size control throughout the tube. Multiple self-centering vices are provided for support for longer tube applications. Dampers help support the tube and eliminate vibrations during operation. The system uses a recirculating high-pressure coolant system and a chip shredder to cut long chips prior to transport. A CNC and tool monitoring system are also standard.
Editor PickOkuma Receives ISO Certification for Quality Management
The company says it is the first and only CNC machine tool builder to earn this certification.