Abstract: The invention relates to a method for the impact treatment of transition radii (8) of a crankshaft (4), in particular transition radii (8) between connecting rod bearing journals (5) and crank webs (7) and/or transition radii (8) between main bearing journals (6) and the crank webs (7) of the crankshaft (4). In order to apply an impact force (FS) to at least one of the transition radii (8) along the respective transition radius (8) circulating about the crankshaft (4) in an annular manner, a heavily loaded region (BMAX), a lightly loaded region (BMIN), and intermediate regions (BZW) lying therebetween are defined, and an impact treatment is then carried out such that the impact force (FS) introduced into the intermediate regions (BZW) is increased in the direction of the heavily loaded region (BMAX).

Abstract: The invention relates to a device for the impact treatment of transition radii (8) of a crank-shaft (4), in particular transition radii (8) between connecting rod bearing journals (5) and crank webs (7) and/or transition radii (8) between main bearing journals (6) and the crank webs (7) of the crankshaft (4). The device comprises an impact device (1) in order to introduce an impact force (FS) into at least one transition radius (8), wherein the impact device (1) has multiple impact heads (21) which are paired with the same transition radius (8).

Abstract: 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.

Abstract: The invention relates to a method for post-processing a crankshaft (4), in particular in order to correct concentricity errors and/or for a length correction. Sectors (S1,S2,S3,S4,S5,S6) of the crankshaft (4) which produce and/or characterize concentricity errors are detected and/or a length deviation (?L1 ?L2, ?L3) from a target length (L1,L2, L3) is determined for at least one section of the crankshaft (4). An impact force (Fs) is then introduced into at least one defined transition radius (8) between connecting rod bearing journals (5) and crank webs (7) and/or between main bearing journals (6) and the crank webs (7) of the crankshaft (4) by means of at least one impact tool (16) in order to correct the concentricity errors and/or the length deviation (?L1 ?L2, ?L3).

Abstract: The invention relates to a method for the impact treatment of transition radii (8) of a crankshaft (4, 4?), in particular transition radii (8) between connecting rod bearing journals (5, 5?) and crank webs (7, 7?) and/or transition radii (8) between main bearing journals (6, 6?) and the crank webs (7, 7?) of the crankshaft (4, 4?). The crankshaft (4, 4?) is then rotated along a rotational direction into an impact position by means of a drive device (3, 3?). A locking device (12) is provided in order to lock the crankshaft (4, 4?) in the impact position, and an impact force is then introduced into at least one transition radius (8) by at least one impact tool (16, 16?).

Abstract: In a method for increasing the strength of a component subjected to torsional and flexural stress, in particular of a crankshaft, in a first step essentially the entire component is provided with a nitriding layer. In a second step, the nitriding layer is at least partially removed in at least one highly stressed region of the component by means of cutting machining, and, in a third step, the at least one highly stressed component region freed of the nitriding layer is mechanically strain-hardened.

Abstract: The invention relates to a method for increasing the bending strength and the endurance limit of crankshafts by locally restricted hammering in areas of high stress, such as grooves, the mouths of bores and cross-sectional transition zones, in which method pressure impulse machines or beating devices comprising heating tools are employed. The pressure impulse machines or beating devices only execute a relative displacement of the beating tool against the surface of the crankshaft segment to be processed when the compressive stress is introduced between the heating tool and said surface of the crankshaft segment to be processed. The invention also relates to a device for increasing the endurance limit of crankshafts.

Abstract: A device (1) for the induction hardening of components (2) which have a circular cross section, especially crankshafts, has two inductor half-shells (4, 5) arranged along a portion of the periphery of the component (2) to be hardened. At least one of the two inductor half-shells (4, 5) has only one inductor segment (6) through which current flows.

Abstract: An apparatus for hardening cylindrical bearing locations on a shaft, in particular a crankshaft, in which transition radii to the adjacent shaft parts are of undercut design, is provided with a heating unit, which is connected to a power supply, and with an inductor. The inductor has two heating conductor arms, which are arranged at a distance from one another and each run in the peripheral direction of the bearing location that is to be hardened. Each of the two heating conductor arms is provided with an inner bearing-surface hardening branch and two outer radius hardening branches, the bearing-surface hardening branch in each case being mechanically connected to the radius hardening branches by current-carrying elements which bear the radius hardening branches. The mechanical connection is sufficiently elastic for the radius hardening branches to be displaceable relative to the bearing-surface hardening branch in the axial direction of the shaft that is to be hardened.

Abstract: In a process for the induction hardening of crankshafts with at least one connecting-rod pin and with at least two main bearings, in particular for the hardening of the at least one connecting-rod pin, by means of a contactlessly operating inductor, the crankshaft performs a rotational movement during the hardening of the at least one connecting-rod pin. The center axis of the at least one connecting-rod pin to be hardened is used as the axis for the rotational movement of the crankshaft.

Abstract: The invention relates to a device for simultaneous peripheral electro-inductive hardening of bearing surfaces (2A, 3A) and transition A radii in crankshafts (1), comprising lifting pins (2, 3) arranged directly adjacent to each other and one behind the other with different angular positions on the plane perpendicular to the their axis of rotation (D), wherein inductors (8, 9) are provided which are placed on the lifting pins (2, 3) approximately in the same direction (C) thereof. A lifting pin (2, 3) is allocated to each inductor, which is arranged in such a way that it intersects the axial direction of the crankshaft (1). Said inductor comprises at least two inductor detents (8C, 8D, 9C, 9D) arranged parallel to each other. One inductor detent (8D, 9D) is arranged in an overlay area (4) of the lifting pins (2, 3) while the other inductor detent (8C, 9C) is arranged in an edge area of the lifting pin (2, 3) facing a cheek (5, 6).

Abstract: In a method for the inductive surface hardening of workpieces with any desired external geometries, especially camshafts for internal combustion engines, an inductor (15) is provided which at least partially surrounds the workpiece (2 or 4). The workpiece (2 or 4) executes a uniform rolling motion, and, given a constant coupling distance (X), the internal contour (18) of the inductor (15) represents a line parallel to the rolling contour (16) of the workpiece (2 or 4).

Abstract: A method for the inductive hardening of working surfaces and transition radii on crankshafts in which, to receive connecting rods, crank pins are disposed directly one after another at different angular attitudes in planes at right-angles to the axis of rotation is disclosed. By the subject invention, adjacently disposed inductors are applied against the crank pins from the same side. Both inductors are disposed in the region between the two serially disposed crank pins and are spaced apart from each other.

Abstract: An inductor for heating rotating metal workpieces, especially for surface hardening the running surfaces, transition radii and shoulders of camshafts to different depths, has two or more heating regions which can be brought into the required heating position by changing the direction of rotation of the workpieces and, when the inductor has more than two heating regions, by using a movable abutment. When the inductor has two heating regions, then change from one region to another is achieved by simply changing the direction of workpiece rotation so that friction causes the inductor to be displaced. When the inductor has, for example, three heating regions (13, 14, 15), then an abutment (11) is used to control the inductor displacement. For more rapid displacement of the inductor or for cases where the workpiece is stationary, an external pusher device may be used.