| 摘要 |
Forming a vehicle rim to precise tolerances by first forming a contoured strip into a closed hoop; then radially expanding the hoop in a press having radially outwardly moving die sections; finally precision-finishing by applying pressure to all parts of the rim in a press having radially inwardly moving die sections which lock against the outer rim surface while an axially moving punch exerts radial outward, as well as axial, pressure.
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