Equipment and method in which a creator tool is pressed against an annular upset collar of an inner ring of a wheel hub and is provided towards the collar with a toothing complementary to the toothing to be obtained, formed by a plurality of radial teeth separated by respective radial spaces, all arranged radially in a circular crown, symmetrically with respect to a first axis (B) defining the axis of symmetry of the tool; wherein the creator tool is provided with an annular radial containment element configured to delimit a continuous wall which closes off respective radially outer ends of the radial spaces.

Equipment and method in which a creator tool is pressed against an annular upset collar of an inner ring of a wheel hub and is provided towards the collar with a toothing complementary to the toothing to be obtained, formed by a plurality of radial teeth separated by respective radial spaces, all arranged radially in a circular crown, symmetrically with respect to a first axis (B) defining the axis of symmetry of the tool; wherein the creator tool is provided with an annular radial containment element configured to delimit a continuous wall which closes off respective radially outer ends of the radial spaces.

A swing gear set for a large scale or heavy machine can be produced from components of a swing gear set including an internal gear ring assembled from plurality of internal toothed segments and/or an external gear ring assembled from a plurality of external toothed segments. The internal toothed segments and/or the external toothed segments are produced by bisecting a metal block in the shape of a rectangular prism into first and second intermediate blanks. The metal block can be produced by a forging process and the intermediate blanks can be machined by various machining process to produce the finished internal and external toothed segments.

A swing gear set for a large scale or heavy machine can be produced from components of a swing gear set including an internal gear ring assembled from plurality of internal toothed segments and/or an external gear ring assembled from a plurality of external toothed segments. The internal toothed segments and/or the external toothed segments are produced by bisecting a metal block in the shape of a rectangular prism into first and second intermediate blanks. The metal block can be produced by a forging process and the intermediate blanks can be machined by various machining process to produce the finished internal and external toothed segments.

The present disclosure provides a method for forging a gear capable of preventing burrs from being formed at an edge of the surface opposite to a direction in which a material in external teeth of the material is pushed. A first exemplary aspect is a method for moving the second punch along a tooth profile groove of the guide die to stack the material and the second punch in this order; and pushing the material and the second punch into a tooth profile groove of the tooth profile die in a stacked state to pass them therethrough, in which a tooth pressing part of the second punch covers at least an edge of a region where external teeth are formed on a surface of the material on the first punch side.

The present disclosure provides a method for forging a gear capable of preventing burrs from being formed at an edge of the surface opposite to a direction in which a material in external teeth of the material is pushed. A first exemplary aspect is a method for moving the second punch along a tooth profile groove of the guide die to stack the material and the second punch in this order; and pushing the material and the second punch into a tooth profile groove of the tooth profile die in a stacked state to pass them therethrough, in which a tooth pressing part of the second punch covers at least an edge of a region where external teeth are formed on a surface of the material on the first punch side.

A method for manufacturing a gear which effectively prevent a crack from occurring inside a tooth part when rolling processing is performed on a teeth part of a gear raw material is achieved. A method according to one embodiment for manufacturing a gear by performing rolling processing on a tooth part of a sintered gear raw material. The method includes, when the rolling processing is performed on the tooth part of the gear raw material, pressing the gear raw material toward a center of rotation of the gear raw material by a rolling machine and, when at least the rolling processing is performed on the tooth part of the gear raw material toward a center of a thickness thereof by a pressing machine, pressing a region where an internal density of the tooth part of the gear raw material decreases.

A method for manufacturing a gear which effectively prevent a crack from occurring inside a tooth part when rolling processing is performed on a teeth part of a gear raw material is achieved. A method according to one embodiment for manufacturing a gear by performing rolling processing on a tooth part of a sintered gear raw material. The method includes, when the rolling processing is performed on the tooth part of the gear raw material, pressing the gear raw material toward a center of rotation of the gear raw material by a rolling machine and, when at least the rolling processing is performed on the tooth part of the gear raw material toward a center of a thickness thereof by a pressing machine, pressing a region where an internal density of the tooth part of the gear raw material decreases.

A tooth shape of the first tooth-shaped die part is formed have a constant tooth width from an upper end to a lower end and to correspond to a tooth width of a part in which a desired crowning has been produced. A tooth shape of the second tooth-shaped die part is formed to have a constant tooth width from an upper end to a lower end and to correspond to a tooth width of a central part, which is a part other than the part in which the desired crowning has been produced. A crowning forming method includes the steps of: forming a tooth shape on an outer circumference of the material by the tooth shape of the first tooth-shaped die part; and pressing the central part of the tooth shape of the material against the tooth shape of the inner circumference of the second tooth-shaped die part.

A tooth shape of the first tooth-shaped die part is formed have a constant tooth width from an upper end to a lower end and to correspond to a tooth width of a part in which a desired crowning has been produced. A tooth shape of the second tooth-shaped die part is formed to have a constant tooth width from an upper end to a lower end and to correspond to a tooth width of a central part, which is a part other than the part in which the desired crowning has been produced. A crowning forming method includes the steps of: forming a tooth shape on an outer circumference of the material by the tooth shape of the first tooth-shaped die part; and pressing the central part of the tooth shape of the material against the tooth shape of the inner circumference of the second tooth-shaped die part.