METHOD OF MAKING BALL STUDS
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Abstract
THE METHOD OF MAKING BALL STUDS IN COLD-PRESSING BY A TRANSFER PRESS IN WHICH A BLANK HAVING GENERALLY THE SAME VOLUME AND OUTER DIAMETER AS A FINISHED BALL STUD AND ITS SHAFT PORTION, BY FIRST CUTTING AND THEN EXTRUDING THE BLANK FORWARDLY TO FORM A TAPERED STEM AND SHANK PORTION, FORMING A PRELIMINARY CYLINDRICAL SHAPE FOR THE SPHERICAL HEAD PORTION BY BACKWARDLY EXTRUDING THE BLANK, AND THEN UPSETTING THE PRELIMINARY CYLINDRICAL SHAPE TO FORM THE SPHERICAL HEAD PORTION.
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