| 摘要 |
In an apparatus for producing molded bodies of rotation by rolling from blanks, the blanks are conducted longitudinally through the gap between two rolls having helical molding profiles extending in the same direction and approaching steadily the desired end profile of the molded body of rotation. At least one of the two rolls has imparted thereto a vibratory motion perpendicular to the roll axis and relative to the other roll, and this vibratory movement has a frequency of more than 50 cps, with the frequency being dependent on how great a reduction of the cross section is necessary. The amplitude of the vibratory movement is preferably up to about 2 mm.
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