The present invention provides a method for producing a ring-rolled material of an Fe—Ni based superalloy which inhibits AGG, has a fine-grained structure having an ASTM grain size number of at least 8, and has high circularity. A method for producing a ring-rolled material of an Fe—Ni based superalloy having a composition of an Alloy 718 comprises: heating a ring-shaped material for ring rolling having the composition, in a temperature range of 900° C. to 980° C., and performing finishing ring rolling, as a finishing ring rolling step; heating the ring-rolled material that has been subjected to the finishing ring rolling, in a temperature range of 980 to 1010° C.; and correcting ellipticalness while expanding a diameter of the ring-rolled material by using a ring expander.

A method for manufacturing a vehicle steering wheel, the steering wheel comprising: —a rim, —an outer sheath formed by at least one strip attached around at least one part of the rim, —at least one device passing through the outer sheath, the method comprising at least the following steps: —positioning the strip around the rim, —attaching the strip to the rim in order to form the outer sheath, —forming an opening in the outer sheath facing an internal part of the device, —folding portions of the outer sheath towards the inside of the rim.

A method for manufacturing a vehicle steering wheel, the steering wheel comprising: —a rim, —an outer sheath formed by at least one strip attached around at least one part of the rim, —at least one device passing through the outer sheath, the method comprising at least the following steps: —positioning the strip around the rim, —attaching the strip to the rim in order to form the outer sheath, —forming an opening in the outer sheath facing an internal part of the device, —folding portions of the outer sheath towards the inside of the rim.

A plurality of press rolls (33) each having an inclined roll central axis (β) are used. Each of press rolls (33) and a hub ring (22z) are relatively rotated while pressing a roll processing surface portion (34) of each of the press rolls (33) against a plurality of locations of a tubular portion (25) of the hub ring (22z) in a circumferential direction to plastically deform the tubular portion (25).

A method for manufacturing a vehicle steering wheel, the steering wheel comprising: —a rim, —an outer sheath formed by at least one strip attached around at least one part of the rim, —at least one device passing through the outer sheath, the method comprising at least the following steps: —positioning the strip around the rim, —attaching the strip to the rim in order to form the outer sheath, —forming an opening in the outer sheath facing an internal part of the device, —folding portions of the outer sheath towards the inside of the rim.

A method includes mounting a hollow cylinder on a turntable, positioning an additive-manufacturing deposition tool at a surface of the hollow cylinder, and rotating the hollow cylinder on the turntable while depositing material on the hollow cylinder with the deposition tool. Further, a method includes making an opening in a wall of the hollow cylinder, forming a part to fit in the opening, and welding the part to the hollow cylinder such that the part fills the opening. The hollow cylinder has an inner radius and an outer radius, and the part is formed with an inner radius of curvature and an outer radius of curvature substantially similar to the inner radius and outer radius, respectively, of the hollow cylinder when the part is positioned in the opening.

A method for forging a niobium-tungsten alloy forged ring, including: (S1) subjecting an alloy ingot to turning, chamfering, spraying with an anti-oxidation coating, stainless-steel sheathing, heating and upsetting to obtain a primary pancake with a flat-die hammer, rapid-forging press or hydraulic press; (S2) subjecting an inner pole to wire electrical discharge machining to obtain a ring blank followed by machining to remove the stainless-steel sheath and oxide scale and defects; and subjecting the ring blank to fluorescent/dye penetrant inspection followed by vacuum stress-relief annealing; (S3) subjecting the ring blank to core shaft/saddle forging on the flat-die hammer or rapid-forging press to obtain a crude forged ring; and (S4) subjecting the crude forged ring to vacuum recrystallization annealing to obtain a desired forged ring.

A method for forging a niobium-tungsten alloy forged ring, including: (S1) subjecting an alloy ingot to turning, chamfering, spraying with an anti-oxidation coating, stainless-steel sheathing, heating and upsetting to obtain a primary pancake with a flat-die hammer, rapid-forging press or hydraulic press; (S2) subjecting an inner pole to wire electrical discharge machining to obtain a ring blank followed by machining to remove the stainless-steel sheath and oxide scale and defects; and subjecting the ring blank to fluorescent/dye penetrant inspection followed by vacuum stress-relief annealing; (S3) subjecting the ring blank to core shaft/saddle forging on the flat-die hammer or rapid-forging press to obtain a crude forged ring; and (S4) subjecting the crude forged ring to vacuum recrystallization annealing to obtain a desired forged ring.

A vehicle steering wheel according to a method of manufacture, the steering wheel comprising: a rim, an outer sheath formed by at least one strip attached around at least one part of the rim, at least one device passing through the outer sheath, the method comprising at least the following steps: positioning the strip around the rim, attaching the strip to the rim in order to form the outer sheath, forming an opening in the outer sheath facing an internal part of the device, folding portions of the outer sheath towards the inside of the rim.

A method of making an interaxle differential unit. The method may include piercing a workpiece and then ring roll forging the workpiece to form an annular case that is a seamless ring. The annular case may be heat treated before installing an interaxle differential unit gear nest inside the annular case.