Apparatus for forming openings of stud and pilot plant in a wheel disk vehicle pre formed.The process of formation of openings of mounting stud and pilot plant in a wheel of vehicle and vehicle wheel disc

摘要

In an 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) and without plastic deformation to the rim or disc. 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) pushes the disc and lower die assembly (82) into shearing engagement with a center punch (76) which forms the center-pilot opening.