Flexing and spin flanging of can body edges

Claim 1

A METHOD OF FLANGING TUBULAR BODIES COMPRISING THE STEPS OF SUPPORTING A TUBULAR BODY AT A MAJOR BODY PORTION THEREOF SO AS TO LEAVE A MINOR CIRCUMFERENTIAL END PORTION OF THE BODY AT ALL TIMES FREE AND UNSUPPORTED; PROVIDING A SPACE BETWEEN THE POINT AT WHICH THE TUBULAR BODY IS SUPPORTED AND THE JUNCTURE POINT BETWEEN THE TUBULAR BODY AND A FLANGE TO BE FORMED GENERALLY NORMAL THERETO, PROVIDING RELATIVE ROTATION BETWEEN THE TUBULAR BODY AND A FLANGING HEAD, PROVIDING RELATIVE AXIAL MOVEMENT BETWEEN THE TUBULAR BODY AND THE FLANGING HEAD TO PROGRESSIVELY DIRECT THE MINOR CIRCUMFERENTIAL END PORTION RADIALLY OUTWARDLY WHILE ALSO MAINTAINING THE MINOR CIRCUMFERENTIAL END PORTION CONTINUALLY FREE AND UNSUPPORTED, AND WORKING THE MATERIAL OF THE MINOR CIRCUMFERENTIAL END PORTION BEYOND ITS ELASTIC LIMIT AS IT IS PROGRESSIVELY DIRECTED RADIALLY OUTWARDLY BY DIRECTING A PLURALITY OF FORCES AGAINST THE MINOR CIRCUMFERENTIAL UNSUPPORTED END PORTION TO EFFECT RAPIDLY REVERSING TENSION AND COMPRESSION FORCES IN INCREMENTAL AREAS OF THE UNSUPPORTED END PORTION WHEREBY THE END PORTION IS TRANSFORMED INTO A FLANGE IN THE ABSENCE OF POLYGONIZATION AND CRACKING OF THE FLANGE.