| 摘要 |
A method of manufacturing a steering rack bar ( 6 ) by forging, the method comprising the steps of pacing a heated cylindrical rack bar ( 6 ) in a first forging die ( 15 ) and forging a first toothed protion ( 37 ) at one end thereof; removing the rack bar; heating the rack bar at or near the other end of said rack; and placing the other end of the rack bar in a second forging die and forging a second toothed portion ( 39 ) wherein, prior to forging the second toothed portion, the rack bar is axially and angularly aligned to a predetermined axial location and angularly orientated utilising the first toothed portion or features at or near the one end of the rack bar as a datum, and placed and held in the predetermined axial location and angular orientation prior to forging of the second toothed portion. |
