Importance

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Abstract

A turntable for supporting an end blank having a tubular flange integral therewith is rotatable about an axis of the tubular flange. An annular threading roll die rotatable with the turntable receives therein the flange of the end blank with a full outer circumferential surface of the tubular flange being held against the annular threading roll die. The annular threading roll die has a first inner threading surface for threading the tubular flange. A threading roll is inserted into the tubular flange of the end flange supported on the turntable in spaced relationship to an inner circumferential surface of the tubular flange. The threading roll is rotatable and movable toward the inner circumferential surface of the tubular flange, and has a second inner threading surface which is complementary to the first threading surface. In operation, the threading roll die is rotated through the turntable and the threading roll is also rotated in synchronism with each other in the same direction, and the threading roll is moved toward the threading roll die to press the threading roll against the inner circumferential surface of the tubular flange while the threading roll die and the threading roll are being rotated. While the first and second threading surfaces are being rotated, they are pressed against the tubular flange to thread the tubular flange.

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First Claim