Process for expanding wheel components

A process of making an expanded product which comprises:

• a. providing a metal tubular workpiece;
• b. presizing the tubular workpiece by expanding it and thereby plastically stretching it into a precise annular configuration, said presizing being to an extent that the presized tubular workpiece closely fits over a post element which has a pair of spaced annular outwardly facing recesses with annular liquid seals therein;
• c. placing the presized tubular workpiece over a post element having a pair of spaced annular outwardly facing recesses with annular liquid seals therein, said placing being to an extent that the workpiece completely surrounds the annular liquid seals;
• d. expanding the annular liquid seals on the post element to firmly engage and seal off a portion of the inside of the workpiece whereby the workpiece and post element and annular liquid seals define a sealed space;
• e. positioning externally of the workpiece an outer die surface having the desired configuration for the finished workpiece;
• f. and pumping liquid under pressure into the sealed space through a hole in the post element, said pumping being of sufficient force to cause the workpiece to plastically deform outwardly against the outer die surface.