The invention relates to a method and a device for finishing toothed workpieces (2) using a tool (1) which is designed in the form of a power skiving cut-ter and is rotated by a tool spindle (17) and which has machining teeth (7) that mesh with tooth gaps (6) of the workpiece (2) in a rolling movement, said workpiece being supported by a workpiece spindle (15), which is arranged in a skewed manner relative to the tool rotational axis (4) and is driven synchronously thereto, such that machining edges (8) of the machining teeth (7) machine the tooth flanks (9) of the teeth (5) of the workpiece (2) in the direction of the tooth flank extension. According to the invention, the tool is used such that the machining edges (8) machine the tooth flanks (9) so as to only grind same without removing chips, wherein for this purpose the rounding radius of the machining edges (8) is greater than the chip thickness or cutting depth (E).

A method for manufacturing a rack including a toothing with variable pitch includes a roughing step, in which a blank of the rack is produced, the blank including at least one extra thickness on at least one zone of the toothing compared to a desired dimensional feature of the rack. The method also includes a finishing step, in which the at least one extra thickness of the blank is removed.

A machine tool (1) for processing gears comprises a workpiece spindle (16) for driving a workpiece (18) to rotate about a workpiece axis (C1), and a tool spindle (11) for driving a tool (12) to rotate about a tool axis (B). An axial slide (7) is used to change a relative axial feed position between the tool spindle and the workpiece spindle with respect to the workpiece axis. The axial slide is guided along an axial guide direction (Z′) which is inclined with respect to the workpiece axis by an inclination angle (ψ), the inclination angle (ψ) being between 0.1° and 30°.

A method and apparatus for processing a metallic workpiece with defined edges (e.g., a gear) comprises media blasting of the workpiece by directing a first media against exposed surfaces on the workpiece to increase the root strength of the gear, the blasting causing the defined edges to be radiused or mushroomed, ceasing the media blasting, loading the workpiece into a finishing apparatus, and subjecting the workpiece to a finishing process with a second media, the exposed surfaces on the workpiece being subjected to the finishing process to reduce the radiused edges on the workpiece created from the media blasting. The process of moving the workpiece to the spindle-finishing apparatus from the media blasting may be performed automatically by a machine. Once the workpiece has been subjected to the finishing process with the second media, it may be removed from the spindle-finishing machine, washed, and rinsed with rust inhibitor whereby wear properties of the workpiece are enhanced.

A method and apparatus for processing a metallic workpiece with defined edges (e.g., a gear) comprises media blasting of the workpiece by directing a first media against exposed surfaces on the workpiece to increase the root strength of the gear, the blasting causing the defined edges to be radiused or mushroomed, ceasing the media blasting, loading the workpiece into a finishing apparatus, and subjecting the workpiece to a finishing process with a second media, the exposed surfaces on the workpiece being subjected to the finishing process to reduce the radiused edges on the workpiece created from the media blasting. The process of moving the workpiece to the spindle-finishing apparatus from the media blasting may be performed automatically by a machine. Once the workpiece has been subjected to the finishing process with the second media, it may be removed from the spindle-finishing machine, washed, and rinsed with rust inhibitor whereby wear properties of the workpiece are enhanced.

The present disclosure includes a shaft and spindle assembly for retaining a part in a part processing assembly. The part is retained on the shaft via a downward force from a part hold-down assembly. The shaft is retained in the spindle assembly that is coupled to a turntable of the part processing assembly. The shaft includes an annular step that abuts against a portion of the spindle assembly to block downward movement of the shaft when the downward force is applied. In this way, the part is retained in a precise location relative to processing nozzles of the part processing assembly even after multiple parts are held down by the part hold-down assembly and processed.

A gear machining support device supports machining when a tooth of a gear is machined on a workpiece by relatively moving the workpiece and a machining tool while synchronizing rotations of the workpiece and the machining tool around respective center axis lines thereof. The gear machining support device includes: a target modification amount storage unit configured to store target modification amounts of at least two of modification elements of a tooth surface shape of the tooth of the gear, the modification elements including crowning, bias, a helix angle, a pressure angle, and a tooth profile roundness; and a correction amount determination unit configured to determine a correction amount of a machining control element during a machining operation such that the at least two of modification elements approximate the respective target modification amounts stored in the target modification amount storage unit.

There is provided a method of forming a ring gear, including providing a tube having an inner surface comprising gear teeth, the tube being a hollow tube formed by extrusion. The method also includes inserting a shaping tool into the tube, the shaping tool having tool teeth to mate with the gear teeth, and extended and retracted configurations. The shaping tool may be inserted into the tube in its retracted configuration. Moreover, the method includes extending the shaping tool into its extended configuration to cause the tool teeth to mate with the gear teeth and to exert a radially outward force on the tube. Furthermore, the method includes fixing a shape of an outer perimeter of the tube, retracting the shaping tool into its retracted configuration to reduce the radially outward force exerted by the shaping tool on the tube, and removing the shaping tool from the tube.

There is provided a method of forming a ring gear, including providing a tube having an inner surface comprising gear teeth, the tube being a hollow tube formed by extrusion. The method also includes inserting a shaping tool into the tube, the shaping tool having tool teeth to mate with the gear teeth, and extended and retracted configurations. The shaping tool may be inserted into the tube in its retracted configuration. Moreover, the method includes extending the shaping tool into its extended configuration to cause the tool teeth to mate with the gear teeth and to exert a radially outward force on the tube. Furthermore, the method includes fixing a shape of an outer perimeter of the tube, retracting the shaping tool into its retracted configuration to reduce the radially outward force exerted by the shaping tool on the tube, and removing the shaping tool from the tube.

The invention relates to a method for modifying the geometry of gear wheel tooth flanks with a tool with a toothing that engages with the gear wheel during a precision machining. A varied profile is produced on the tool over the width of the tool, in that during a dressing procedure a dressing wheel is moved along the tooth flank of the tooth to be dressed. The width of the teeth of the dressing wheel is much smaller than the width of the tool. In order to cover the width of the tool a length must be covered corresponding to a multiple of the width of the teeth of the dressing wheel. After the dressing, the precision machining of the gear wheel is carried out with the tool. Since the dressing wheel is moved with a changing pitch and a changing crossed axes angle relative to the tool, the modification of the tooth flank geometry can be reproduced in the tool. A modification of the crossed axes angle dependent on the helical angle of the tool takes place with equalization of the helical angle of the tool changing over the width of the teeth of the tool.