The invention relates to a forming method of an annular forging of 718 Plus alloy, which comprises the following steps: wrapping the cylindrical surface of a blank of the 718 Plus alloy with a first blanket, further heating to 1000-1100 C., then stopping heating, and immediately performing upsetting and punching treatment on the blank; further respectively wrapping the outer surface and the punched inner surface of the blank after treatment with second blankets, further heating to 1000-1060 C., then stopping heating, immediately performing blank holder reaming treatment on the blank; and respectively wrapping the outer surface and the reamed inner surface of the blank after treatment with the second blankets, further heating to 985-1038 C., then stopping heating, and immediately rolling the blank to obtain a final product, after the method is used for treatment, the grain size of the forging achieves level 6 or above, and the surface has no common cracks.

A torsion bar includes a central portion extending in an axial direction about a longitudinal axis. The torsion bar also includes a first end portion having a splined outer surface, the first end portion disposed proximate a first end of the torsion bar, the first end portion spaced from the central portion with a first annular groove extending circumferentially about the torsion bar.

A steering rack meshes with a pinion rotatably driven by the input shaft of a steering gear constituting an automotive steering device. The steering rack is provided with a an axially extending rod part of round cross section, and a plurality of rack teeth formed on a radial one side surface of an axial portion of the rod part, the rack teeth meshing with the pinion. At least one dummy tooth is formed in portions that are axial parts of the rod part and are adjacent to both axial sides of the plurality of rack teeth. The dummy tooth has a tooth height less than the rack teeth and does not mesh with the pinion.

A method for manufacturing a rolling bearing unit is provided to periodically reciprocate a stage (38) in a vertical direction by rotating and driving a servo motor (44) while rotating a roll about a central axis of a hub main body using a roll driving motor (43) in a state in which a processing surface of the roll is pressed against other end surface of a caulking section in an axial direction. A period of the reciprocation is restricted by a relation between a rotation position of the roll about the central axis of the hub main body and an engaged state between concave sections, which are sections between a plurality of processed teeth formed in the processing surface of the roll, and a face spline tooth formed by the concave section.

A manufacturing method is provided for a hollow rack bar made of a hollow shaft material and including a toothed section which has a rack on an outer surface and a shaft section which is thinner than the toothed section. The manufacturing method includes: (i) drawing the hollow shaft material using a die and a plug, and preforming regions of the hollow shaft material including a toothed section formation region configured to become the toothed section and a shaft section formation region configured to become the shaft section so as to have thicknesses according to the respective regions; and (ii) forming the rack at the toothed section formation region of the hollow shaft material which is preformed.

A rack for a steering gear may include a toothed portion that has a toothing extending along a longitudinal axis, and a generally cylinder-segment-shaped back opposite the toothing and having a back radius. A method for producing such a rack may involve forming a cylindrical blank with an unmachined radius between a toothed die part having a toothed mold clearance and a back die part having a back mold clearance in a die cavity. The die may have a generally cylinder-segment-shape. In an open position of the die, the blank may be inserted between the toothed mold clearance and the back mold clearance. The toothed die part and the back die part in a forging stroke for closing the cavity may then be moved in a closing direction to a closed position. The back radius of the back mold clearance may be larger than the unmachined radius of the blank.

A rack for a steering gear may include a toothed portion that has a toothing extending along a longitudinal axis, and a generally cylinder-segment-shaped back opposite the toothing and having a back radius. A method for producing such a rack may involve forming a cylindrical blank with an unmachined radius between a toothed die part having a toothed mold clearance and a back die part having a back mold clearance in a die cavity. The die may have a generally cylinder-segment-shape. In an open position of the die, the blank may be inserted between the toothed mold clearance and the back mold clearance. The toothed die part and the back die part in a forging stroke for closing the cavity may then be moved in a closing direction to a closed position. The back radius of the back mold clearance may be larger than the unmachined radius of the blank.

A support apparatus for supporting a steering rack forged in a forging die, comprising a gripper to grip the shank of the rack, a lost-motion mechanism supporting the gripper and permitting limited movement in the direction of closing of the forging die, and a side-shift mechanism to move the gripper sideways. The lost-motion mechanism abuts the die assembly as the forging die closes thereby positioning the gripper to grip the shank of the steering rack during the final closing travel of the forging die. The gripper then lifts the steering rack as the forging die opens. The side-shift mechanism then moves the gripped steering rack sideways.

A manufacturing method for a connecting rod includes applying a tensile load to an end portion of the connecting rod as precompression in a cross direction that intersects with a longitudinal direction, the end portion being an longitudinal end portion of the connecting rod and having a through-hole, and fracture splitting the end portion into a rod portion and a cap portion by applying a tensile load to the end portion in the longitudinal direction in a state where the precompression is applied to the end portion.

A manufacturing method is used for an outer joint member of a constant velocity universal joint. The outer joint member includes a cup section having track grooves formed in its inner periphery, which are engageable with torque transmitting elements, and a shaft section formed at a bottom portion of the cup section. The manufacturing method includes welding the cup and shaft members by irradiating a beam to joining end portions of the cup and shaft members, causing an outer surface including the welded portion to be formed into a flat smooth surface by removal processing, irradiating ultrasonic waves to the flat smooth surface with one probe at an incident angle which prevents total reflection in a circumferential angle beam flaw detection method, and setting a focal point of the ultrasonic waves to positions from a surface to an inside of the welded portion, to thereby perform inspection.