| 摘要 |
<p>A method and apparatus (50) for forming bolt and center-pilot mounting openings in vehicle wheels, particularly styled-disc vehicle wheels. A preformed rim and disc assembly is engaged and fixtured around the rim bead seat with the inboard disc face resting on a lower die assembly (82). An upper die assembly (52) having an array of bolt hole punches (56) is moved into piercing-and-coining engagement with the disc to form the bolt openings. Continued motion of the upper die assembly (52) against the wheel disc punches the disc and lower die assembly (82) into shearing engagement with a center punch (76) which forms the center-pilot opening. The axes of the bolt openings and/or center-pilot opening and/or bead seats may be aligned or offset from each other. </p> |
