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US 6,976,377 B2Granted
Method of and apparatus for producing tubes of metal
AssigneeSMS Meer GmbH
InventorsHermann-Josef Klingen, Thomas Winterfeldt, Norbert Zillekens
Life of this patent
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Abstract
In the planetary skew rolling blooms to form seamless metal tubing or pipe the internal tool is retracted at the leading and/or trailing end of the tubular bloom to allow the rolls to seal the end or ends and prevent coolant from entering the rolled tubing or bloom. The internal tool is advanced back into its normal rolling position after the end has passed the rolling location.
Claims15
A method of producing metal tubing in a planetary skew rolling mill which comprises the steps of:
- (a) advancing a tubular metal bloom between a plurality of rolls of a planetary skew rolling mill, positioning a mandrel-shaped internal tool within said bloom and rolling the bloom with said rolls against said mandrel-shaped internal tool to a reduced wall thickness of a rolled tubing in a working position of said internal tool;
- (b) upon approach of an end of said bloom to a region of said rolls, withdrawing said mandrel-shaped internal tool from said working position linearly by a predetermined distance in a direction opposite a direction of advance of the bloom;
- and
- (c) upon said end passing said region of said rolls, displacing said mandrel-shaped internal tool linearly back into said position.
1 more element
A planetary skew rolling mill for producing metal tubing, comprising:
- a plurality of rolls in a planetary skew rolling mill configuration and a mandrel-shaped internal tool within a tubular metal bloom for rolling the bloom with said rolls against said mandrel-shaped internal tool to a reduced wall thickness of a rolled tubing in a working position of said internal tool;
- and
- a device connected to said internal tool and effective upon approach of an end of said bloom to a region of said rolls for withdrawing said mandrel-shaped internal tool from said working position linearly by a predetermined distance in a direction opposite to a direction of advance of the bloom, and effective upon said end passing said region of said rolls for displacing said mandrel-shaped internal tool linearly back into said position.
Dependencies are inferred from the claim text.