The invention discloses a hard-rolling roller head with two separate housings for deep rolling the outside radii of adjoining crankpins of a split-pin crankshaft. The hard-rolling roller head provides an effective support of the two housings against one another, when machining split-pin crankshafts, and simultaneously prevents the upper areas of these housings from drifting apart.

A roll body for a hydrostatic rolling tool includes a center, an axis of rotation running through the center, and a machining zone for rolling a workpiece. The roll body is rotatable about the axis of rotation and the machining zone has a working profile line formed in a cross-section of the roll body. The working profile line has a first working arc extending around a first machining center and a second working arc extending around a second machining center. The first machining center is arranged offset to the center, and the second machining center is arranged offset to the center and offset to the first machining center. In an example embodiment, the roll body has a parallel to the axis of rotation, the first machining center lies in the cross-section on the parallel, and the second machining center lies in the cross-section on the parallel.

A roll body for a hydrostatic rolling tool includes a center, an axis of rotation running through the center, and a machining zone for rolling a workpiece. The roll body is rotatable about the axis of rotation and the machining zone has a working profile line formed in a cross-section of the roll body. The working profile line has a first working arc extending around a first machining center and a second working arc extending around a second machining center. The first machining center is arranged offset to the center, and the second machining center is arranged offset to the center and offset to the first machining center. In an example embodiment, the roll body has a parallel to the axis of rotation, the first machining center lies in the cross-section on the parallel, and the second machining center lies in the cross-section on the parallel.

The invention discloses a hard-rolling roller head with two separate housings for deep rolling the outside radii of adjoining crankpins of a split-pin crankshaft. The hard-rolling roller head provides an effective support of the two housings against one another, when machining split-pin crankshafts, and simultaneously prevents the upper areas of these housings from drifting apart.

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.

A rolling tool for the roller finishing of bearing surfaces of a crankshaft is pivotable around a crankshaft axis, with a finishing roller head and with a support roller head. In order to prevent damage to the guide mechanisms, the roller finishing roller is guided on all sides in a roller cage and the finishing roller head has a frame wherein it is mounted pivotably around a first pivot axis which is perpendicular to the crankshaft axis and parallel to a tangent on a working side of the roller finishing roller. Additionally or alternatively, the support roller head comprises a support roller frame in which the support roller housing is mounted pivotably around a second pivot axis perpendicular to the crankshaft axis and parallel to the first pivot axis, and around a third pivot axis perpendicular to the crankshaft axis and perpendicular to the first pivot axis.

The invention relates to a hard-rolling roller for a deep rolling tool having a torus-shaped base body for deep rolling of radiuses or recesses which limit the bearing trunnion on crankshafts on both sides, and two at least approximately truncated cone-shaped central bodies, rising on both sides of the body. A cylindrical body rises on the upper end surface of one of the two central bodies.

The invention concerns a process for roll straightening crankshafts (8, 8) using crankshaft deep rolling tools (1 to 7), in particular work rollers (18,19) which, while the crankshaft (8, 8) is rotated about its axis of rotation (21), are pressed into the recesses (14 to 17) or radii that delimit the bearing pins (Hi, Pi) on either side with a roll straightening force (27, 30) that constantly fluctuates around the circumference of a bearing pin (H.sub.1 to H.sub.5, P.sub.1 to P.sub.4). Roll straightening is carried out by determining the individual vector (34) of the runout by size and direction (35) at each main bearing (Hi) of the crankshaft (8, 8). The largest (45) or resulting vector (25) is determined from the individual vectors (34), then the main bearing pins (Hi) and crankpins (Pi) of the crankshaft (8, 8) are roll straightened with a roll straightening force (27, 30, 49, 50) the size (25) and direction (26) of the largest (45) or resulting vector (25) of which is between 0 and a multiple of the largest (45) or resulting vector (25).