There is provided a method for manufacturing ring-shaped members at a good yield and high production efficiency. To achieve this object, the following is performed. A single (a sequence of) forging produces a joined body formed by radially coupling four cylindrical portions with different inner diameter sizes. A cylindrical member that has the largest inner diameter size and a cylindrical member that has the third largest inner diameter size after the forging are employed as ring-shaped members without change. A rolling process is performed on respective cylindrical member that has the smallest inner diameter size and cylindrical member that has the second largest inner diameter size to obtain ring-shaped members. Thus, two sets of ring-shaped members are obtained as two sets of inner rings and outer rings.

There is provided a method for manufacturing ring-shaped members at a good yield and high production efficiency. To achieve this object, the following is performed. A single (a sequence of) forging produces a joined body formed by radially coupling four cylindrical portions with different inner diameter sizes. A cylindrical member that has the largest inner diameter size and a cylindrical member that has the third largest inner diameter size after the forging are employed as ring-shaped members without change. A rolling process is performed on respective cylindrical member that has the smallest inner diameter size and cylindrical member that has the second largest inner diameter size to obtain ring-shaped members. Thus, two sets of ring-shaped members are obtained as two sets of inner rings and outer rings.

In a method for producing a vehicle seat fitting, in which a plain bearing bush (28) is pressed in the axial direction into a receptacle of a first fitting part (11), wherein the pressed-in plain bearing bush (28) has a radially protruding securing region (28b), the securing region (28b) is formed before or after the pressing-in operation by material of the plain bearing bush (28) being displaced uncut, and the wall thickness (b) of the plain bearing bush (28) being less than 1.5 mm.

In a method for producing a vehicle seat fitting, in which a plain bearing bush (28) is pressed in the axial direction into a receptacle of a first fitting part (11), wherein the pressed-in plain bearing bush (28) has a radially protruding securing region (28b), the securing region (28b) is formed before or after the pressing-in operation by material of the plain bearing bush (28) being displaced uncut, and the wall thickness (b) of the plain bearing bush (28) being less than 1.5 mm.

A first piece (13) includes a first ring portion (13b) and a second ring portion (13c) which are arranged side by side in an axial direction and an inner diameter and an outer diameter of the first ring portion (13b) are respectively larger than an inner diameter and an outer diameter of the second ring portion (13c). A second piece (16) is obtained by pressing the first piece (13) while the first piece (13) is disposed between a first set and a second set.

A first piece (13) includes a first ring portion (13b) and a second ring portion (13c) which are arranged side by side in an axial direction and an inner diameter and an outer diameter of the first ring portion (13b) are respectively larger than an inner diameter and an outer diameter of the second ring portion (13c). A second piece (16) is obtained by pressing the first piece (13) while the first piece (13) is disposed between a first set and a second set.

In a recirculating ball nut for a ball screw drive, having a base body which includes at least one recirculating ball track, the base body is a forged component and the recirculating ball track is manufactured by a cutting manufacturing method. A further subject matter of the invention is an assembly for a ball screw drive of a power steering, having a belt pulley and a recirculating ball nut according to the invention, the belt pulley being connected to the recirculating ball nut so as to be non-rotatable relative thereto. A further subject matter of the invention is a method of manufacturing a recirculating ball nut.

In a recirculating ball nut for a ball screw drive, having a base body which includes at least one recirculating ball track, the base body is a forged component and the recirculating ball track is manufactured by a cutting manufacturing method. A further subject matter of the invention is an assembly for a ball screw drive of a power steering, having a belt pulley and a recirculating ball nut according to the invention, the belt pulley being connected to the recirculating ball nut so as to be non-rotatable relative thereto. A further subject matter of the invention is a method of manufacturing a recirculating ball nut.

In order to produce a formed part furnished with a through hole, a rod material is advanced by a defined length in the direction of its lengthwise extension into a forming die through a stationary guide and then immobilised by a clamping arrangement that engages with it circumferentially. The end portion of the rod material is then axially swaged by a swaging tool and is thus shaped into a disc, the circumference of which is defined by the forming die. The disc is then penetrated axially by a dishing tool and impact extruded at the same time, the displaced material flowing between the dishing tool and the inner circumferential wall of the forming die. The formed part located in the forming die is then rotated coaxially relative to the rest of the rod material and thereby separated from the rest of the rod material by torsion shearing.

In order to produce a formed part furnished with a through hole, a rod material is advanced by a defined length in the direction of its lengthwise extension into a forming die through a stationary guide and then immobilised by a clamping arrangement that engages with it circumferentially. The end portion of the rod material is then axially swaged by a swaging tool and is thus shaped into a disc, the circumference of which is defined by the forming die. The disc is then penetrated axially by a dishing tool and impact extruded at the same time, the displaced material flowing between the dishing tool and the inner circumferential wall of the forming die. The formed part located in the forming die is then rotated coaxially relative to the rest of the rod material and thereby separated from the rest of the rod material by torsion shearing.