Method of forming shouldered articles

Claim 1

A METHOD FOR THE FORMING OF A PLURALITY OF AXIALLY SPACED CONTOURS IN THE BORE OF A HOLLOW WORK PIECE IN ONE CONTINUOUS OPERATION COMPRISING THE STEPS OF FEEDING SAID WORK PIECE THROUGH A PLURALITY OF OPPOSITELY LOCATED PULSATING DIES EXERTING FORCES ONTO THE WORK PIECE ADEQUATELY LARGE TO REDUCE ITS OUTSIDE DIMENSIONS AND MAKE ITS INTERIOR CONFORM TO A STEPPED MANDREL LOCATED WITHIN THE BORE OF THE BLANK, HOLDING THE LEADING SECTION OF SAID MANDREL STATIONARY UNDERNEATH THE DIES AND FEEDING THE WORK PIECE OVER THE MANDREL AND THROUGH THE DIES AT A GIVEN FEED RATE BY FORCE EXERTED ON ITS TRAILING END, IN SUCH MANNER AS TO MAKE THE FORMED PART EMERGE BEHIND THE DIES AT A RATE EQUAL TO THE FEED RATE PLUS THE ELONGATION OCCURING DURING THE REDUCING OF THE WORK PIECE CROSSSECTION; CONTINUING THIS OPERATION TO A PREDETERMINED POINT ALONG THE AXIS OF THE WORK PIECE AND FROM THERE ON FORCING THE MANDREL TO MOVE AT THE FEED RATE THROUGH THE DIES TO FEED AND REDUCED THE WORK PIECE IN SUCH MANNER AS TO MAKE THE FORMED PART EMERGE BEHIND THE DIES AT A RATE NO GREATER THAN THE FEED RATE AND TO FORCE THE ELONGATION OF THE WORK PIECE RESULTING FROM ITS CROSS-SECTION REDUCTION TO TAKE PLACE IN A DIRECTION OPPOSITE TO THE FEED DIRECTION, RESULTING IN A FORWARD ELONGATION FOR ONE PORTION OF THE FORMING OPERATION AND IN A BACKWARD ELONGATION FOR ANOTHER PORTION OF THE FORMING OPERATION.

Claim 2

A METHOD FOR THE FORMING OF A PLURALITY OF AXIALLY SPACED CONTOURS IN THE BORE OF A HOLLOW WORK PIECE IN ONE CONTINUOUS OPERATION COMPRISING THE STEPS OF FEEDING SAID WORK PIECE THROUGH A PLURALITY OF OPPOSITELY LOCATED PULSATING DIES EXERTING FORCES ONTO THE WORK PIECE ADEQUATELY LARGE TO REDUCE ITS OUTSIDE DIMENSIONS AND MAKE ITS INTERIOR CONFORM TO A STEPPED MANDREL LOCATED WITHIN THE BORE OF THE BLANK, HOLDING THE LEADING SECTION OF SAID MANDREL STATIONARY UNDERNEATH THE DIES AND FEEDING THE WORK PIECE OVER THE MANDREL AND THROUGH THE DIES AT A GIVEN FEED RATE BY FORCE EXERTED ON ITS TRAILING END, IN SUCH MANNER AS TO MAKE THE FORMED PART EMERGE BEHIND THE DIES AT A RATE EQUAL TO THE FEED RATE PLUS THE ELONGATION OCCURING DURING THE REDUCING OF THE WORK PIECE CROSSSECTION; CONTINUING THIS OPERATION TO A PREDETERMINED POINT ALONG THE AXIS OF THE WORK PIECE AND FROM THERE ON FORCING THE MANDREL TO MOVE AT THE FEED RATE THROUGH THE DIES TO FEED AND REDUCED THE WORK PIECE IN SUCH MANNER AS TO MAKE THE FORMED PART EMERGE BEHIND THE DIES AT A RATE NO GREATER THAN THE FEED RATE AND TO FORCE THE ELONGATION OF THE WORK PIECE RESULTING FROM ITS CROSS-SECTION REDUCTION TO TAKE PLACE IN A DIRECTION OPPOSITE TO THE FEED DIRECTION, RESULTING IN A FORWARD ELONGATION FOR ONE PORTION OF THE FORMING OPERATION AND IN A BACKWARD ELONGATION FOR ANOTHER PORTION OF THE FORMING OPERATION.