The invention relates to a method for work-hardening a crankshaft (4) comprising connecting rod journals (5), main bearing journals (6) and crank webs (7), the connecting rod journals (5) and the main bearing journals (6) being provided with oil holes (31). According to the invention, at least one end (30) of one of the oil holes (31) and/or at least one cylindrical portion (38) of the oil holes (31) is/are work-hardened.

The invention concerns a rolling unit for machining the wheel running surfaces of wheelsets for rail vehicles, with the rolling unit featuring at least one work roller by means of which the wheel running surface to be machined is subjected to a deep rolling process following manufacture of the wheelset in new condition or, at a later date, after reprofiling to increase the service life of the wheel running surfaces. The task is solved to create a relevant rolling unit by means of which the wheel running surfaces can be deep-rolled in the forward feed process using work rollers. This task is solved by the rolling unit featuring a base body on which a support arm is located in a vertical position to the base area, on which a receptacle is supported that is unilaterally fixed in position via a thread in the support arm and on which an angular contact ball bearing is located; this supports at least one work roller featuring at least two different rolling radii.

A cage arrangement comprises substantially flat rollers, which are guided in a roller cage arranged on a housing and are held in position by a substantially strip-like cage metal sheet attached to the housing at a position remote from the roller region. The cage metal sheet has a retaining piece that protrudes in the direction of a roller in an intended installation position and has an end-face region, the shape of which corresponds to that of a roller surface facing the retaining piece.

A burnishing machine is provided in which both sides of a groove is machined by a single tool without changing the movement direction of a piston.

The burnishing machine, includes: a tip configured to press and process a process face; and a pressurizing unit configured to press the tip against the process face, the pressurizing unit including, a piston configured to reciprocate in a direction orthogonal to the tip, a cylinder portion that accommodates the piston such that the piston reciprocates; and a pressurizing mechanism configured to urge the tip to the process face at both timing of pushing the tip against the process face and pulling the tip against the process face by making the piston reciprocate.

Internal and external screw thread burnishing assemblies are provided. In the internal screw thread burnishing assembly, diametrically opposed removable cartridges carrying burnishing wheels are received in cavities of a support structure axially movable into the space circumscribed by the internal screw thread. Fluid pressure is utilized to forcibly translate the cartridges radially outwardly to place their burnishing wheels into burnishing engagement with the internal screw thread, with a spring structure resiliently biasing the cartridges toward retracted orientations thereof within the support structure. In the external screw thread burnishing assembly, burnishing wheels are carried on the outer ends of pivotally supported arms which may be pivoted by fluid pressure to drive the burnishing wheels into burnishing engagement with diametrically opposite portions of the external screw thread, with a spring structure resiliently biasing the arms pivotally away from one another.

Internal and external screw thread burnishing assemblies are provided. In the internal screw thread burnishing assembly, diametrically opposed removable cartridges carrying burnishing wheels are received in cavities of a support structure axially movable into the space circumscribed by the internal screw thread. Fluid pressure is utilized to forcibly translate the cartridges radially outwardly to place their burnishing wheels into burnishing engagement with the internal screw thread, with a spring structure resiliently biasing the cartridges toward retracted orientations thereof within the support structure. In the external screw thread burnishing assembly, burnishing wheels are carried on the outer ends of pivotally supported arms which may be pivoted by fluid pressure to drive the burnishing wheels into burnishing engagement with diametrically opposite portions of the external screw thread, with a spring structure resiliently biasing the arms pivotally away from one another.

An automotive shaft fillet treating method including laser hardening a green machined fillet surface to a uniform depth d to induce compressive stresses into the surface, the surface extending the entire length l between outer edges of two undercut regions of the fillet, and applying additional compressive stress to the laser hardened surface via fillet rolling such that the uniform depth d is maintained along the entire length l during a subsequent grinding operation.

The invention relates to a roller burnishing tool (10) having a roller support (12), which projects in an advancement direction (V) and on which, in a circumferential direction, at least one burnishing roller (14) for machining a workpiece surface is provided such that it can rotate about a roller axis (A), wherein the at least one burnishing roller (14) has a contact surface for coming into contact with the workpiece. According to the invention, the at least one burnishing roller (14) has a basic cylindrical shape and the at least one burnishing roller (14) is mounted such that it can be moved in a radial direction (R).

The invention relates to a rolling device for rolling work pieces with toothing, in particular gear wheels, with (g) a first shaping tool (14.1), (h) at least one second shaping tool (14.2) and at least one guide (16) designed for the guided movement of the shaping tools (14.1, 14.2) relative to a work piece, such that a first region (B1) of a tooth flank (38) of the work piece can be shaped with the first shaping tool (14.1), (i) wherein the first shaping tool (14.1) has a first roller (46.1) that is rotatably mounted about a first tool rotational axis (D14.1), (j) wherein the second shaping tool (14.2) has a second roller (46.2) that is rotatably mounted about a second tool rotational axis (D.sub.14.2) and (k) wherein the first roller (46.1) has a first effective axial thickness (d.sub.1) on the circumference thereof.
According to the invention, the second roller (46.2) has a second effective axial thickness (d.sub.2) on the circumference thereof, which differs from the first effective axial thickness (d.sub.1) such that a second region (B2) of the tooth flank (38) that is different from the first region can be shaped with the second shaping tool (14.2).

A method and compression roller tool for increasing the strength of load-bearing surfaces on shafts, in particular on crankshafts, which surfaces are pre-machined with the removal of chips, wherein the cylindrical surfaces of the main bearing journals and pin-bearing journals and optionally also the journal of crankshafts have additional oil bores. At least one of the load-bearing surfaces is compression-rolled by way of at least one cylindrical body which has a surface structure and extends over the width of the load-bearing surface. Afterwards, the compression-rolled load-bearing surfaces are machined with the removal of chips with a low chip depth. The compression roller tool consists of a cylindrical compression roller body and a supporting body opposite it, wherein the compression roller body has thickened portions on its cylindrical surface, which thickened portions run either in the circumferential direction or in the axial direction or diagonally with respect to the axial direction.