Abstract: In a method for manufacturing a hollow wheel which includes an internal toothing and an external toothing, wherein the internal toothing is a gear toothing, a workpiece is machined by way of a stamping tool. The workpiece has a tubular section with a longitudinal axis and a first stabilisation section for the shape stabilisation of the tubular section during the machining. The tubular section is inserted into a die having an internal die toothing. The workpiece is machined on the inner side by the stamping tool so as to simultaneously produce internal and external toothing by way of the workpiece executing a rotation movement with a temporally varying rotation speed and the stamping tool executing radially oscillating movements that are synchronised with the rotation movement.

Abstract: A method for manufacturing a composite brake disc including a brake ring with at least one braking surface and a brake disc chamber having a tubular section and a base part that is connected to the tubular section and by way of which a reference plane is defined. The brake disc chamber and the brake ring are joined together, and a wobble angle between the at least one braking surface and the reference plane is reduced by reshaping the brake disc chamber.

Abstract: With the method for manufacturing a composite brake disc, which includes a brake disc chamber and a friction ring having an inner profiling, a brake disc chamber blank is introduced into the friction ring. The brake disc chamber blank is then formed into the inner profiling via at least one embossing tool. A composite brake disc permitting a good torque transmission between the friction ring and the brake disc chamber can be manufactured in a cold-forming manner in this way. The forming-in can take place in a hammering manner, in particular by successively implementing a plurality of embossing steps in the region of different profile gaps of the inner profiling. Axial stops can also be simultaneously produced on forming-in. The axial stops serve to stop the brake disc chamber and the friction ring (3) are prevented from axially sliding apart.

Abstract: A method for manufacturing a hollow wheel equipped with an internal gear toothing, wherein a work-piece includes a tubular section with a longitudinal axis, by which the term radial utilized in the following is defined. By N?2 stamping tools, of which each one during the implementation of the method is brought into a working position, the tool for producing the gear toothing is processed on the inside of the tubular section, wherein the work-piece carries out a rotating movement with a rotation speed varying in time around the mentioned longitudinal axis and at least one stamping tool in the working position carries out radially oscillating movements, which are synchronized with the mentioned rotating movement. The at least one stamping tool in the working position processes the work-piece repeatedly.

Abstract: A method is disclosed for cold-form profiling cylindrical, thin-walled hollow parts (1), comprising profiles (4) which extend in an essentially parallel manner in relation to the longitudinal axis (A) of the hollow part (1). At least one profiling tool (5) engages in a strike-like hammering manner with the outside of the hollow part (1) in a radial manner in relation to the longitudinal axis (A) o the hollow part (1). The profiling tool (5) engages, respectively, in an essentially vertical and oscillating manner on the surface of the hollow part (1). Then, the profiling tool (5) is displaced in an axial manner in relation to the hollow part (1) at a constant radial adjusting depth until the desired profile length is obtained.

Abstract: A grooved profile for a form fitting hub-shaft connection in which a groove profile for a hub and a shaft include flanks which are structured and arranged as opposing flanks. The groove profile includes a groove profile height in at least one of the hub and the shaft, a wall thickness in at least one of the hub and the shaft smaller than the groove profile height, and at least one of the opposing flanks is one of curved and arc-shaped in cross section.

Abstract: A groove profile for a positive hub-shaft connection has a hub having a plurality of grooves with an essentially quadrilateral groove cross section and a shaft having a plurality of grooves with an essentially quadrilateral groove cross section. Additionally, the groove profile has at least one rib radially projecting from one of the grooves of the hub or shaft towards one of the grooves of the other of the hub or shaft.

Abstract: A method and device are disclosed for producing tubes that are at least partially profiled on their interior and preferably on their exterior from a hollow cylindrical blank (3), using a mechanical cold forming method, wherein the end of the blank (3) that is not to be machined (3?) is fed to a clamping device (10). The blank (3) is then secured in the clamping device (10) and a mandrel (2) is subsequently inserted into the end of region (3) of the blank (3) that is to be machined. A lance (8) is guided in the mandrel so that it can be coaxially displaced in a longitudinal direction and the free end of the lance (8?) can be introduced into the clamping device (10). The tip (8?) of the lance (8) is then brought into a positive fit with the clamping device (10) in the axial direction of the blank (3) and the mandrel (2), together with the clamping device (10) and the blank (3) is guided axially through a fixed machining point (6).

Abstract: A device and method for manufacture of workpieces having defined profiling. A device includes an axially moveable workpiece holder and at least one forming tool. There is a first drive structured and arranged to intermittently rotate the workpiece holder about a longitudinal axis of a workpiece held in the workpiece holder, and a second drive, separate from the first drive, structured and arranged to rotate the at least one forming tool to act periodically on the workpiece. The device also includes an electronic control operably connected to the first drive and the second drive, which controls intermittent rotational movement of the workpiece holder based upon the second drive. The at least one forming tool includes profiled wheels or rollers that are driven to continually rotate along a circular orbit that is oriented parallel or obliquely to the longitudinal axis of the workpiece.

Abstract: A grooved profile for a form fitting hub-shaft connection in which a groove profile for a hub and a shaft include flanks which are structured and arranged as opposing flanks. The groove profile includes a groove profile height in at least one of the hub and the shaft, a wall thickness in at least one of the hub and the shaft smaller than the groove profile height, and at least one of the opposing flanks is one of curved and arc-shaped in cross section.

Abstract: A groove profile for a positive hub-shaft connection has a hub having a plurality of grooves with an essentially quadrilateral groove cross section and a shaft having a plurality of grooves with an essentially quadrilateral groove cross section. Additionally, the groove profile has at least one rib radially projecting from one of the grooves of the hub or shaft towards one of the grooves of the other of the hub or shaft.

Abstract: The invention relates to a device for producing cylindrical workpieces (1) having defined profiled sections. The device comprises a workpiece holder (2) that is axially displaceable and intermittently rotates about a longitudinal axis (Z), and shaping tools (9; 12) that periodically act upon the workpiece. The inventive device is characterized by at least one drive (11) for the intermittent rotation of the workpiece holder (2), which is mechanically separate from the drive (8) for the shaping tools (9; 12). The drive (11) is linked with an electronic control which controls the intermittent rotational movement depending on the drive (8) of the shaping tools (9; 12). The invention allows to adjust any intermittent movement relative to the position and angle of the workpiece (1), thereby contributing to a precise and especially rapid processing of the workpiece (1).

Abstract: A punching and stamping machine has a movably guided die plate frame, in which an eccentric shaft for the drive of the die is simultaneously disposed. The die plate frame is moved by means of a plate cam which is directly coupled with the eccentric shaft As a result, a forcibly guided movement is achieved between the die and the die plate which, with respect to the workpiece to be machined, is superimposed such that the die carries out only minimal movements with respect to the workpiece and therefore, particularly in the case of a hollow-cylindrical workpiece, permits the machining from the interior side to the exterior. As a result of this forced guidance, very high operating speeds can advantageously be achieved with a high precision.

Abstract: A process and device for manufacturing cylindrical hollow bodies out of a blank through cold forming using roll cylinders is provided. The axes of the roll cylinders in this process are essentially adjusted parallel to the axis of the workpiece and execute, essentially radial to the workpiece, an oscillating, reciprocating movement. This reciprocating movement is executed in such a manner that in the upper oscillation stop the roll cylinders and the workpiece preferably just barely touch each other without the application of force, and in the lower oscillation stop preferably dip into the surface of the workpiece up to the desired infeed depth in order to achieve the demanded external diameter of the workpiece. With this process the very high static pressures required for press roll machines can be avoided, which results in small and light engine frames, and simultaneously makes it possible to machine workpieces with flanges directly up to the flanges.

Abstract: In an impact rolling apparatus the axes of roller heads are arranged substantially perpendicularly relative to the longitudinal axis of the workpiece. Accordingly, a displacing of the material at the workpiece proceeds predominantly tangentially perpendicularly to the longitudinal axis of the workpiece, caused by the impact effect of the impact rollers mounted at the roller heads. By this arrangement of the roller heads impact rolling operations can be performed close to a shoulder of the workpiece and marked steps thus maintaining the advantages over the known impact rolling method at which the displacement of the material proceeds predominantly in the direction of the longitudinal axis of the workpiece.

Abstract: Process for the production of a toothed rack via cold forming, the rack produced thereby, and an apparatus for practicing the process. The cold formed rack workpiece shows multiple traces of cold forming in the toothing direction. During the production process, the workpiece, in the apparatus, is moved transversely to the axis of the rolling head, relative to the rotatably driven rolling head. Rolls, having forming ribs, are rotatably journalled within the rolling head, along at least one helical line, with the rolls rotating with the rolling head in a planetary manner. Thereby, each roll performs, in quick sequence, single rolling steps that overlap each other in the feed direction of the apparatus slide. Therein, the tooth space form-type forming ring ribs engage the workpiece.

Abstract: The well-known Grob cold forming machine for carrying out the Grob method of impact roll-shaping utilizes rolling head carriers that move toward and away from the workpiece wherein each rolling head carrier is provided with rotatably driven rolling heads. Journalled in the rolling heads are impact formers or rollers which, during rotation of the rolling head, within their circle of rotation perform single forming steps on the workpiece which is mounted on a mandrel. In addition, each rolling head carrier carries a freely rotatably journalled pressure roll having an axis parallel to or angled relative to the mandrel axis, the pressure roll being located outside the rotational circle of the impact former. Via the use of pressure rolls, mainly axial shaping is achieved and thereafter, via the use of the impact former, mainly radial shaping is achieved in the same set-up and on the same mandrel.

Abstract: The well known Grob method, as practiced on a Grob machine, uses at least a partially profiled mandrel wherein during a cold forming operation, via a forming or impact roller of a workpiece blank, produces a hollow workpiece that is profiled at least internally wherein the material is shaped radially as well as axially in a single operation and the axial and radial shaping of the workpiece blank is achieved at least internally as a whole or in part in a straight or helical manner relative to the workpiece axis, by means of this forming roller and achieves the economical production of high quality workpieces in a single operation, with outer profiling also being achievable, and the difference (D) between the outer radius (RO) of the workpiece blank and the outer radius (RD) of the mandrel preferably being the same as or smaller than the length (WL) of the finished workpiece.

Abstract: Rolling tools are rotatably mounted in rotatably driven rolling heads such that they revolve in a planetary-like fashion while the rolling heads rotate. The rolling tools thus roll with blows or impacts upon the outer surface of the rotating workpiece which is advanced along its lengthwise axis. A diameter reduction of the workpiece occurs and the workpiece material is predominantly displaced in lengthwise direction. The workpiece is moved along its axis in the feed direction at an axial feed velocity of at least 3 millimeters for each workpiece revolution, and in the case of hollow workpieces preferably at least at 5 millimeters per workpiece revolution. Difficulties which otherwise arise for certain materials can thus be avoided, and also the production speed and quality can be increased. For hollow workpieces, undergoing internal profiling upon a mandrel, the workpiece which is advanced at high axial feed is preferably also cold rolled during its return feed or motion.

Abstract: According to the well known Grob method, there is fabricated on a mandrel provided with outer or external toothing or teeth a substantially dished or pot-shaped hollow body with corresponding inner or internal toothing or teeth. This fabrication operation starts with a blank comprising an at least partial web portion or dish base and a rim portion or dish rim projecting in a substantially tube-like or tubular configuration from the web portion or dish base. As seen in longitudinal section, this blank possesses a rounded or arcuate portion in the transition region or zone between the rim portion or dish rim and the web portion or dish base. This rounded or arcuate portion has a mean radius of curvature which is at least as large as the wall thickness of the rim portion or dish rim of the blank.