Showing papers on "Roller burnishing published in 1984"

Single pass boring, skiving and roller burnishing tool

Abstract: A boring, skiving, and roller burnishing tool includes means for boring, skiving, and burnishing a cylindrical hole in a workpiece. The boring means comprises a plurality of cutting blades oriented at a particular angle to remove a relatively large amount of material from the hole. The roller burnishing means includes a roller race having a central axis and a frustoconical outer surface tapering radially outward and axially forward. Rollers are arranged about the outer surface of the race for rolling engagement with the internal surface of the hole. The smaller ends of the rollers face forward, and the taper of the rollers is such that the outermost surface portion of each roller is parallel to the central axis of the race. The rollers are biased in the forward direction using a roller pusher with a chosen force so that the force exerted on the internal surface of the hole remains constant over a range of sizes of the hole. The skiving means includes a retractable knife having a pair of radially extendible knife holders defining a camming path having an axial portion and an angled portion. A push dart has a camming element with complementary camming surfaces which ride along the camming path. Axial actuation of the push dart causes the knife holders to extend radially into a stable, locked position.

Roller-guided cutting tool

Abstract: A skiving and roller burnishing tool for finishing the internal surface of a cylindrical bore includes a cutting assembly and a pair of roller burnishing assemblies. Each roller assembly includes a plurality of frustoconical rollers mounted on a frustoconical bearing surface. By translating the individual rollers axially, the effective diameter of the outer surfaces of the roller can be changed. By applying a constant force on the rollers, the two roller assemblies hold the tool firmly in place inside the work piece, preventing accidental misalignment of the cutting tool. It has been found that this workpiece is particularly well suited for finishing relatively long bores.

Method and device for the finishing by roller burnishing of a helical thread cut on a cylindrical part

Abstract: A wheel (16) of which the periphery is shaped as a profile which is complementary to that of the threading to be surfaced, is used as a cutter for roller burnishing a helical thread. The wheel (16) is idle mounted in rotation about an axis inclined to the axis of the screw (10) which is rotatingly driven on itself about the axis thereof. The wheel (16) is resiliently applied against the screw (10) by means of a compression spring (56) which pushes back the pivoting support (18) of the wheel (16) in the direction of the screw (10). The carriage (20) on which the support (18) is pivotingly mounted is free to move with a translating motion parallel to the axis of the screw (10) on a rail (22). Application to the finishing by roller burnishing of a helical thread by an automatic repetitive cycle of a given number of passes of a burnishing wheel along the thread.