Cold-rolling seamless copper tubing
AssigneeSMS Meer GmbH
InventorErling Roller
Life of this patent
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Abstract
Seamless tubing of a nonferrous material is made by continuously and concomitantly advancing a tubular workpiece of the nonferrous material along an axis through a rolling station, radially squeezing the workpiece in the station between external rolls and an internal mandrel to radially reduce a wall thickness of the workpiece and increase an axial length of the workpiece so that the workpiece is heated, and spraying a liquid coolant against the workpiece in and upstream of the station to maintain the workpiece at a temperature below a recrystallization temperature of the material.
Claims20
A method of making seamless tubing of a nonferrous material, the method comprising the steps of continuously and concomitantly:
- advancing a tubular workpiece of the nonferrous material along an axis through a rolling station;
- radially squeezing the workpiece in the station between external rolls and an internal mandrel to radially reduce a wall thickness of the workpiece and increase an axial length of the workpiece, whereby the workpiece is heated;
- and
- spraying a liquid coolant against the workpiece in and upstream of the station at a rate so as to carry off heat from the workpiece at a rate equal to more than 10,000 W/m2K to maintain the workpiece at a temperature below a recrystallization temperature of the material.
A method of making seamless tubing of a nonferrous material, the method comprising the steps of continuously and concomitantly:
- advancing a tubular workpiece of the nonferrous material along an axis through a rolling station at a speed of V m/sec;
- radially squeezing the workpiece in the station between external rollers and an internal mandrel in a zone having an axial length of U m and with a force axial lengthening the workpiece by an amount L such that the workpiece spends a time T sec passing through the zone according to the formula:
- T=2U/(V+V/L)+U/(V/L)
- to radially reduce a wall thickness of the workpiece and increase an axial length of the workpiece, whereby the workpiece is heated;
- and
- spraying a liquid coolant against the workpiece in and upstream of the station to maintain the workpiece at a temperature below a recrystallization temperature of the material.
Dependencies are inferred from the claim text.