| 摘要 |
A hub assembly includes a hub having a flange and a spindle projected from the flange, a housing located around the hub spindle, and an antifriction bearing between the housing and the spindle. The bearing includes an inner race which the spindle initially accommodates in that the spindle has a deformable end over which the inner race is passed. Thereafter, the deformable end is upset into a formed end in a rotary forming procedure that involves forcing the deformable end and a forming tool together while the spindle and tool rotate. The formed end should bear snugly against a back face on the inner race and capture the inner race on the spindle. In the forming procedure the spindle and forming tool are forced together initially in a coarse feed which provides the formed end that bears against the back face of the inner race, then at a fine feed, and finally at a dwell. The force is monitored throughout; A force or rate of change of force which fails to meet certain established criteria will result in the rejection of the hub assembly that experiences that force or rate. For example, the force approaching the end of the fine feed must increase at a rate that exceeds a prescribed minimum rate; the force at the end of the fine feed must not exceed a prescribed maximum and perhaps exceed a prescribed minimum, the force approaching the end of the dwell must exceed a prescribed minimum and must decrease at a rate above a prescribed minimum rate. |
