Tube cutting apparatus and method
OwnerManfred Schmid, Rainer Käsingerinventors
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Abstract
A process for producing tubes (1), in particular for use in heat exchangers, from at least one metallic strip on a rolling mill train, wherein the strip, on a rolling mill train, is provided with predetermined breaking points, deformed and brought together to form the tube and finally the tubes are torn off at the predetermined breaking points between two pairs of rolls having a speed difference. The process is improved, in terms of the tearing off of individual tubes, in that an areal compressive force (Ak) is applied to the tube at least at the moment of tearing off and a sufficient tearing force (Rk) is produced and transmitted to the tube to be torn off.
Claims22
-21. (canceled)
A method of producing heat exchanger tubes comprising:
- providing at least one metallic strip on a rolling mill train;
- forming predetermined breaking points on the at least one metallic strip on the rolling mill train;
- deforming the at least one metallic strip to form a tube;
- tearing the tube at the predetermined breaking points between a first pair of rolls and a second pair of rolls having a different speed to form a plurality of tubes;
- applying an areal compressive force to the tube at least at a moment of tearing the tube;
- and
- transmitting a sufficient tearing force to the tube.
A rolling mill train for carrying out a process for producing tubes from at least two endless metallic strips comprising:
- at least one station for introducing predetermined breaking points into the strips;
- a section for deforming the strips to form a tube;
- and
- a tearing-off device for the tubes that includes a first pair of rolls (WP1) and a second pair of rolls (WP2),
- wherein at least the second pair of rolls (WP2), lying in a conveying direction of the tube, of the tearing-off device is formed from at least two pairs of rolls (WP2.1, WP2.2), the rolls of which are connected by at least a first transport belt (10) and a second transport belt (20).
A tearing-off device for tubes as a constituent part of a rolling mill train, the device comprising:
- a first pair of rolls (WP1);
- and
- a second pair of rolls (WP2),
- wherein at least the second pair of rolls (WP2), lying in a conveying direction of the tubes, of the tearing-off device is formed from at least two pairs of rolls (WP2.1;
- WP2.2), the rolls of which are connected by means of at least a first and a second transport belt (10, 20).
Dependencies are inferred from the claim text.