Method and apparatus for producing metal sheets
AssigneeUlrich Bruhnke
InventorsRalf Anderseck, Andreas Jaeger, Karl-Heinz Lindner
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Abstract
Metal sheets (13) are produced from strand-shaped profiles (8) having a low thickness, made of magnesium or magnesium alloys by way of an extrusion system (1). The open or closed extruded profile (8) exiting the extrusion die (6-7) of an extrusion press (1) is shaped to obtain a flat metal sheet (13) and is then subjected to a defined shaping process by way of stretch-forming. The system for carrying out the method is essentially composed of an extrusion press (1) comprising a die plate generating the extruded profile and a shaping unit (5) following the die plate, wherein the shaping unit (5) is composed of a severing unit (2), a bending unit (3), and an unrolling unit (4).
Claims5
A method for producing metal sheets from strand-shaped profiles having a low thickness made of magnesium or magnesium alloys, an extruded tubular profile being produced and cut corresponding to the length of the metal sheet to be produced in a preceding method step, the extruded tubular profile having a longitudinal opening along a peripheral surface line thereof, characterized in that
- in a first step, the longitudinal opening of the extruded tubular profile is pushed onto two displaceable angled gibs and
- bent open to obtain a U-shaped profile by moving the angled gibs apart;
- in a second step, the U-shaped profile is transferred into an unrolling unit, gripped by gripping elements on the longitudinal sides of the U-shaped profile,
- and shaped by outwardly moving the gripping elements to obtain a metal sheet;
- and
- in a third step, the metal sheets are subjected to defined shaping by lateral stretch-forming,
- wherein all steps of shaping the extruded profile to obtain the metal sheet take place in a temperature range above 200° C.
A method for producing magnesium or magnesium alloy metal sheets from tubular profiles, comprising:
- providing an extruded tubular profile made of magnesium or magnesium alloy having a length corresponding to the length of the metal sheet to be produced and a longitudinal opening along a peripheral surface line thereof;
- pushing the longitudinal opening of the extruded profile onto two displaceable angled gibs;
- moving the angled gibs apart to bend open the extruded profile and form a U-shaped profile;
- transferring the U-shaped profile into an unrolling unit;
- gripping longitudinal sides of the U-shaped profile by gripping elements and outwardly moving the gripping elements to form a metal sheet;
- and
- stretch-forming the metal sheets to obtain a defined shape,
- wherein all steps of shaping the extruded profile to obtain the metal sheet are performed at a temperature above 200° C.
A system for producing metal sheets from an extruded tubular profile, comprising:
- an extrusion press (1) comprising a die plate generating the extruded tubular profile;
- and
- a shaping unit (5) following the die plate, wherein the shaping unit (5) is composed of
- a severing unit (2) for cutting the extruded profile corresponding to the length of the metal sheet to be produced,
- a bending unit (3) for bending the extruded profile into a U-shaped profile by moving apart angled gibs, and
- an unrolling unit (4) having gripping elements in form of floating collets connected to hydraulic cylinders for unrolling the U-shaped profile into metal sheets and for stretch-forming the metal sheets.
Dependencies are inferred from the claim text.