A METHOD OF MANUFACTURING ONE-PIECE WHEEL OF 5 AND 15 DROP CENTER RIMS AND THE ONE-PIECE WHEEL CONSTRUCTION

摘要

This invention relates to a construction, apparatus and a method of producing a one- piece wheel of Soand lSo drop center rim, providing a generally circular steel blank from a sheet stock of pre-determined uniform thickness, the blank is preferably with a center hole pierced to a predetermined size. The blank is preformed in spinning machine to a predetermined profile & cylindrical shape, such preform is further spun and flow formed in a spinning machine, the preform being positioned between an outer roller & inner mandrel and held against the clamping plate, such inner mandrel comprise of a outboard surface which conforms to the predetermined inner diameter of the rim well, the inner & outer bead-seat and outer flange and such outer roller comprise of outboard surface which confirms to the predetermined inner diameter of the inner flange. The preform peripheral cylindrical portion is then spun against the outboard surface of the inner mandrel & outboard surface of the outer roller to a predetermined profile & form in respect of well, inner & outer bead-seats, inner & outer flanges respectively. The spun rim comprising of predetermined semi-finished well, inner & outer bead seats and inner & outer flanges is further subjected to a flow- forming & spinning operation in an spinning machine, while the disc portion being accurately located in the center hole & clamped against the outer clamping plate, the rim peripheral portion being positioned between an inner mandrel and outer roller, such inner mandrel & outer roll comprise of a outboard surface which conforms to the final profile & shape of the well, inner & outer bead seats and the inner & outer flanges, to achieve the final profile and shape of the well, inner & outer bead-seats and the outer& inner flanges.