Method and apparatus for rolling seamless tubes with a...

Details Method and apparatus for rolling seamless tubes with a... Method and apparatus for rolling seamless tubes with a...

B - Operations, Transporting

21

B

80/15

B21B 17/00 (2006.01) B21B 25/02 (2006.01)

Patent

CA 1127430

ABSTRACT OF THE INVENTION Rolling mills for rolling seamless tubes from axially pierced blanks or billets using a restrained mandrel have suffered from a high dead time in operating cycle due to the necessity for returning mandrel-restraining cross- piece or other member from its final position back to its initial position through the roll stands before a start could be made on positioning the next billet to be rolled This invention overcomes the problem by providing an elongate axially extending recess in the mandrel-restrain- ing crosspiece which allows the next billet to be positioned before the end of the preceding rolling operation, ready to be connected up immediately the mandrel-restraining cross- piece has returned to its initial working position, by enabling the crosspiece to pass over the billet which goes through the recess. Retractable positive acting mechanical the mandrel for a rolling cycle to commence.

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