Single pass boring, skiving and roller burnishing tool

A boring, skiving and roller burnishing tool for mounting on a rotatable drive member to bore, skive and burnish the interior of a cylinder or other workpiece, said tool comprising:

• an elongate drive tube assembly having means for attachment to the drive member;
• a means for boring the cylinder attached to the drive tube at the forward end thereof, said means for boring including a plurality of cutting blades oriented to remove material from the cylinder to a preselected diameter as the tool is rotated;
• a means for skiving the cylinder attached to the drive tube rearward of the boring means and including at least one retractable knife capable of removing material from the cylinder at a diameter greater than the preselected diameter as the tool is rotated;
• and
• a means for burnishing the cylinder attached to the drive tube rearward of the skiving means, said burnishing means comprising:
• a roller race having a central axis coincident with that of the drive tube assembly and a frustoconical outer surface tapering radially outward in the axially forward direction;
• a plurality of frustoconically tapered rollers each having a large end and a small end and being arranged about said outer surface with the small ends of said rollers facing forward to that the surface portion of each roller furthest from the central axis of the roller race is generally parallel to said central axis;
• a roller cage having a plurality of slots, said roller cage circumscribing and being spaced apart from the roller race so that said slots and said roller race together define a plurality of cavities for receiving individual rollers;
• a roller pusher having (1) a forward extension for directly engaging the rear surfaces of individual rollers when the pusher is moved forwardly relative to the roller race to push the rollers forward and cause the rollers to translate radially outward along the tapered surface of the roller cage, and (2) a lip for directly engaging the roller cage when the pusher is moved rearwardly relative to the roller race to draw the rollers rearward and allow the rollers to translate radially inward;
• means for biasing said roller pusher in said forward direction with a preselected force so that the force exerted upon said internal surface of said hole remains constant over a range of sizes of said hole;
• and
• means for retracting the roller pusher when the axial force is reduced to draw the roller cage rearwardly so that the rollers move radially inward and the tool can be withdrawn from the workpiece.