Metal deforming – By use of roller or roller-like tool-element – With tool inside hollow work
Patent
1980-01-18
1982-01-19
Mehr, Milton S.
Metal deforming
By use of roller or roller-like tool-element
With tool inside hollow work
72252, B21B 1704
Patent
active
043110320
ABSTRACT:
Rolling mills for rolling seamless tubes from axially pierced blanks or billets using a restrained mandrel have suffered from a high dead time in the oprating cycle due to the necessity of returning a mandrel-restraining cross-piece or other member from its final position back to its initial position through the roll stands before beginning the positioning of the next billet to be rolled. This invention overcomes the above-mentioned problem by providing an elongate axially extending recess in the mandre-restraining crosspiece which allows the next billet to be positioned before the end of the preceding rolling operation. The mandrel-restraining crosspiece is ready to be connected up immediately to the next billet when the mandrel-restraining crosspiece 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 stops project into the recess, when advanced, to connect up the mandrel for a rolling cycle to commence.
REFERENCES:
patent: 2783666 (1957-03-01), McLag
patent: 4186585 (1980-02-01), Passoni et al.
Innocenti Santeustacchio S.p.A.
Mehr Milton S.
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